HP 6825A User manual
 Cr HEWLETT
PACKARD
OPERATING AND
SERVICE MANUAL
BIPOLAR
DC POWER SUPPLY/AMPLIFIER
HP MODEL 6825A
HP Part Мо. 06825-90091
OPERATING AND SERVICE MANUAL
FOR SERIALS 1320A-00101 AND ABOVE"
* For Serials Above 1324A-00101
a change page may be included.
ONE YEAR WARRANTY
This HP product has a one year warranty. Please replace the
first paragraph of the warranty statement on the inside front
cover with the following:
This Hewlett-Packard hardware product is warranted
against defects in material and workmanship for a
period of one year from date of delivery. HP software
and firmware products, which are designated by HP
for use with a hardware product and when properly
installed on that hardware product, are warranted not
to fail to execute their programming instructions due
to defects in material and workmanship for a period
‘of 90 days from date of delivery. If HP receives notice
of such defects during the warranty period, HP shall
repair or replace software media and firmware which
do not execute their programming instructions due to
such defects. HP does not warrant that the operation
for the software, firmware or hardware shall be
uninterrupted or error free. |
Printed: March, 1974
CERTIFICATION
Hewlett-Packard Company certifies that this product met its published specifications at time of shipment from the factory.
Hewlett-Packard further certifies that its calibration measurements are traceable to the United States Nationa! Bureau of
Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other international
Standaros Organization members.
WARRANTY
This Hewlett-Packard hardware product is warranted against defects in material and workmanship for a period of one yaar
from date of delivery. HP software and firmware products, which are designated by HP for use with a hardware product
and when properly installed on that hardware product, are warranted not to fail to execute their programming instructions
due to defects in material and workmanship for a period of 90 days from date of delivery. During the warranty period, HP
Company will, at its option, either repair or replace products which prove to be defective. HF does not warrant that the
operation of the software, firmware, or hardware shall be uninterrupted or error free.
For warranty service, with the exception of warra nty options, this product must be returned to a service facility designated
by HP. Customer shall prepay shipping charges by {and shall pay all duty and taxes) for products returned to HP for warra nty
service. Except for products returned to Customer from another country, HP shall pay for return of products to Customer.
Warranty services outside the country of initial purchase are included in HP's product price oniy if Customer pays HP interna-
tional prices (defined as destination local currency price, or U.S. or Geneva Export price).
If HP is unable, within a reasonable time, to repair or replace any product to a condition as warranted, the Customer shall
be entitled to a refund of the purchase price upon return of the product to HP.
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer,
Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental
specifications for the product, or improper site preparation and maintenance. NO OTHER WARRANTY 1S EXPRESSED OR
IMPLIED. HP SPECIFCALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE.
EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXLCUSIVE REMEDIES. MP SHALL NOT BE
LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED
ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY. |
ASSISTANCE
The above statements apply only to the standard product warranty. Warranty options, extended support contracts, product
maintenance agreements and customer assistance agreements are also available. Contact your nearest Hewlett-Packard Sales
and Service office for further information on HP's full line of Support Programs.
MANUAL CHANGES
Model 68254 DC Power Supply
Manual HP P/N 06825-90001
2/8/91
> all corrections in the manual according to errata below, then check the following table
Tur your power supply serial number and enter any listed changes(s) in the manual.
SERIAL ; MAKE
| —————— - u m ¡ CHANGES |
Prefix | Number : |
+ = É 1 3
1 a 4 a 1 ns 1
; A11 mm 1 Errata |
| 1324A | 00106-00125 | 1 |
: 1517A | 00126-00180 ; 1-2 |
1 16064 ; 00141-00150 ; 1—3
1 18124 ¡ 00151-00320 1 1-4
: 18084 1 00321-00335 | 1-5 4
ı 18184 ‚ 00336-00735 | 1-6 |
: 20484 ¡ 00736-00815 | 1-7 |
1 2125A : 00816-00865 |; 1-8
1 2142A | 00866-00920 | 1-9
1 22208 : 00921-01000 | 1-10
; 23124 ; 01001-01110 | 1- “11, 14%;
: 24164 1 01111-01150 | 1=12,14%|
¡ 21374 | 01151-01480 | 1-18
¡1 28334 ; 01481-01400 | 1-15
¡ 2848 1 01491-01690 | 1-16
1 31154 7 C1691up 1 117 |]
В
+ I 1 i
'
:
ERRATA:
In paragraph 2-19, change the last sentence
to read "Make sure that the correct fuse is
installed if the position of the slide switen
is changed (1A for 115 V operation, and 5 A
for 230 V operation).
In paragraph 3-4, change the third sentence
to read "The power module contains fuse F1
{1A for 115 Vac or .5 A for 230 Vac) and a
slide switch for connecting 115Vac or 230Vac
input power to the instrument.
In Figure 3-14, the
read '"SINK",
-V, +I quandrant should
Change paragraph 7-4, to read
"This diagram, Figure 7-1, shows the
relationship between the instrument as-
semblies and ties the schematic diagram
sheets together,”
"44 the following to the Option No. 007 (ten-
‚An Option Voltage Control) description in
paragraph 1-15 "Shunt resistor A1R53 and
standard VOLTAGE control (HP P/N 2100-3272)
ASR2 are removed when the ten-turn output
voltage control (HP P/N 2100-1867) is instal-
led in the ASR2 location."
— XX Range:
CHANGE 1:
In Table 1-1 make the following changes:
Under General Specifications, change méters
paragraph to read: "Individual voltage and
current meters. DC voltmeter accursoy 1S +3%
of full scale. AC voltmeter accuracy is +/-5%
of full scale with sinusoidal, 100 Hz input.
AC and DC ammeter accuracy is +6% of full
scale."
Under Power Supply Specifications change load
effect (load regulation) to read:
Voltage (X1 Range): 0.01% + .5 my
Voltage (X Range): 0.01% + mV
Change Source Effect (line regulation) to
read:
Voltage (X1 Range): 0.01% + .5 my
Change PARD (Ripple and Noise) to read:
Voltage (X1 Range): 3 mV rms/8 mY p-p
Voltage (X4 Range): 10 mV rms/30 mV p-p
Current: 5 má rms/15 mA p-p
Under Power Amplifier Specifications add the
following to the Distortion Specification:
Total harmonic distortion (THD) at full out-
put is as follows:
i FREQ. | THD |
| ———— == a e e A in TO a an SA lm Am m |
1 100 Hz | .08% |
1 1TkHz | 218 |
1 10 kHz | .35%% |
| 20 kHz | 1.5% |
1 30 kHz | 2.2% |
| 40 kHz | 5% |
In paragraph 5-12 change voltage specified in
step (gq) and (u) to "1,0 му",
In paragraph 5-14 change voltage specified in
steps (f) and (nh) to "3 mV".
In paragraph 5-14 change voltage specified in
steps (k) and (м) to "1.0 my".
In paragraph 5-25 step (c) change the ripple
and noîse values to:
X1 Range: 3 mV rms/8mV p=p
10 mV rms/30 my p-p
In paragraph 5-27 change data after step (e)
to:
X1 Range:
YA Range:
4 mV p-p instead of 8 mV p-p
1% mV nen inetaad nf 20 mv nen
A e - o
н22 to fxd, film, 34.0 +3%, 1/8 W, HP P/u ‘
0698-3134. R23 to fxd, film, 499 +1%, 1/8 W, .;
HP P/N 0698-4123. R24 to fxd, film, 6 k +1%, Y
Model 0U25A Page -2-
in paragraph 5-58 change frequency specified
in step (e) to "40 kHz”,
Add step (f) to paragraph 5-59 as follows: f.
The maximum THD at other frequencies can be
measured in a similar manner. (See Table 1-1
for THD percentages).
(1) of paragraph 5-107 to read as follows: Е.
Momentarily remove the load and adjust front
panel + IZERO ADJ (A1R?) so that the CURRENT
MODE light goes out. Reconnect load and ad-
Just AIR? for a DVM reading of +.7 to +1.0
mV. В. Turn VOLTAGE control fully coun-
terclockwise. i. Momentarily remove the load
and adjust front panel -I ZERO ADJ (A1R3) so
that the CURRENT MODE light goes out.
Reconnect load and adjust A1R3 for a DW
reading of -.7 to 1.0 mV.
Change steps (a) and (b) of paragraph 5-108
to read as follows: a. Set CURRENT METER
Switch to the .24 A DC position.
AIR20 for a front panel ammeter indication of
.2 A.
Change steps (a) through (c) of paragraph
5-111 as follows: a. Connect DVM across the
1 ohm resistor. Set the CURRENT METER switch
to the .16 A ac position b. Adjust function
generator output level for a DVM reading of
14 +0.6 V rms. c. Adjust A1R18 for a .11A
rms on front panel ammeter.
In the Replaceable Parts Table and on the
schematic, make the following changes: Under
A2 voltage and current control plug-in board:
Delete: CR5 diode HP P/N 1901-0050. VRS zener
diode, HP P/N 1902-1221. VR6 zener diode, HP
P/N 1902-0064, Change: C7 to fxd,
4300pF 500 Y, HP P/N 0160-2036.
Under Al Interconnect and Power Supply Board:
Change: RO to fxd, film 2.15 k +1%, 1/8 Y, HP
P/N 0698-008k. R10 to fxd, film, 3.32 k +1%,
1/8 W, HP P/N 0757-0433. R11 to fxd, film,
36.5 к +1%, 1/8 W, HP P/N 0757-0455. Rik to
fxd, film, 1 k +1%, 1/8 W, HP P/N 0757-0280.
R15 to fxd, film, 178 +1%, 1/8 W, HP P/N
0698-3439. R16 to fxd, film, 9 k +1%, 1/8 W,
HP P/N 0698-5454, R17 to fxd, film, 825 +1%,
1/8 W, HP P/N 0757-0421. R19 to fxd, film,
200 +1%, 1/8 Y, HP P/N 0757-1099. R21 to
fxd, film, 2.15 x +1%, 1/8 VW, HP PA
0698-0081. | |
Change steps (в) and
b. Adjust
mica,
1/8 W, HP P/N 0698-3476. R58 to fxd, film,
750 +1%, 1/8 W, HP P/N 0757-0420, ВЕ
On Sheet 1 of Figure 7-2: Connect resis or
A1R15 (178 ohms 1/8 W) between A1S1C pin 12
and A1S1B pin 4.
CHANGE 2:
This change improves transient response by
eliminating oscillations in the CV/CC cross-
over region. '
In the Replaceable Parts Table and on the
Voltage and Current Control Circuits
schematic, make the following changes: Under
A? Voltage and Current Control Plug-In Board:
Delete: CRY diode,HP P/N 1901-0460. Qi,
transistor, HP P/N 1851-0071. Change: R7h to
2.11 k 1%, 1/8 W, HP P/N 0757-0438.
Make above changes in Current Comparison
Amplifier Circuit the on schematic diagram.
ERRATA:
In the Replaceable Parts Table, under Front
Panel-Mechanical change part number of clip,
quantity В, to 1400-0547.
These changes affect the current meter c.
cuit on the Al board. Correct the parts list
and Sheet 1 of the Figure 7-2 schematic as
follows: Change A1R21 to 2.4 k ohm, HP P/N
0698-4435 (the value of A1R21 must be selec- |
ted for optimum performance). Change A1R22
to 100 ohm, HP P/N 0757-0401. Delete A1R1S.
Replace the DC ammeter calibration procedure |
of paragraph 5-108 with the following: a.
Turn off BPS/A. Remove the 10.24 k ohm
resistors and replace the jumpers from A20 to
А21 and from Al3 to All. Ensure that jumpers
are also from A12 to A13 and from A19 to A21.
Adjust the CURRENT control for an output of
0.20 A. b. Set the CURRENT meter switch to
0.24 A DC position. с. Adjust A1R20 for a
front panel ammeter indication of 0.204.
| CHANGE 3:
In replaceable parts list, under Ai
Interconnect and Power Supply — Board-
Mechanical, add heat dissipator (qty. №)
CR12-CR15, HP P/N 1205-0030.
AA AL da AD E ADT of
| | CHANGE 4:
in the Replaceable parts table, make the fol-
lowing changes: Under Al Power Module: Change
Al Power Module to HP P/N 0960-0444, Under
- “assis-Mechanical: Change HP P/N of the bot-
‘мп Tear panel to 5000-3129. Replace para-
graphs 2-18 and 2-19 with the following: 2-18
Model 6825A may be operated continuously from
a nominal 100 У, 120 V, 220 Y, or
(48-63 Hz) power source. À printed circuit
board located within the ac power module on
the rear panel selects the power source.
Voltage choices are available on both sides
of the PC board. Before connecting the in-
strument to the power source check that the
PC board selection matches the nominal line
voltage of the source. The operating voltage
is shown in the window of the ac power
module. If required, select the proper volt-
age as follows (refer to Figure 2-2): a,
Remove power cable from instrument. b. Move
plastic door on power module aside. с.
Jutate FUSE PULL to the left and remove line
fuse Fl. 4d. Remove PC board from slot.
Select operating voltage by orienting PC
board to position the desired voltage on top-
left side of PC board. Push beard firmly into
slot. e. Rotate FUSE PULL back into normal
position and re-insert fuse Fi in holder
sing caution to select the correct value for
; à (JA slo-blow for 100 V or 120 V and 0.5 A
slo-blow for 220 Y or 240 V). ff. Close plas-
tic door and connect power cable.
240 V
Operating Voltage is shown In
module window)
VOLTAGE SELECT
PC BOARD
Figure 2-2. Line Voltage Selection
2-19 When the instrument leaves the factory,
a lA fuse is installed for 120 V operation.
An envelope containing a 0.5 A fuse for 220
V/240 V operation is attached to the instru-
ment. Make sure that the correct fuse value
for Fl is installed if the position of the PC
board is changed.
Change the schematic, Figure 7-2, (Sheet 1),
to illustrate the new Al Power Module
(0960-0444) as shown below.
Add the following to the “Ordering Additional
Manuals” paragraph in Section I: Extra man-
muals may be obtained by specifying Option
910 when ordering your instrument. The number
of extra manuals depends upon the quantity of
Option 910°s ordered.”
P/C A4 POWER MODULE
P/O AL POWER MODULE
TT Г" — am unm em m— ЭК 3 Ti
A551 T2QV 240
100 220¥
| BIE
A
GRA
— nll {SIO o | BY A AB BLK/
— J 1
" { [ОАФ Vel Bs
_ | ¡PY A Ab 10
|
; K WV Wr}
Pace) | 4
La | BLK/RED
| La il F
GND her/can | | VOLTAGE SELECTION | 6
cu (Crass) | PLUG-IN BTARD | GRN/Y
SAFETY GND ELECT OPERATING VOLTAGE BY
ORIENTING BOARD TO POSITION THE DESIRED
VOLTAGE ON TOP LEFT SIDE OF PC. BO. AND
PUSHING BOARD FIRMLY INTO POWER
MODULE SLOT.
In the parts list, page 6-11, change the To» *
ERRATA: cover to HP P/N 5000-9367 gty 1. ‚4
When using a programmable resistance card in- | о
stalled in a 69LOB Multiprogrammer to program
the PS/A, it is possible to generate spikes
at the PS/A's output unless its output is
held at the former value until a new value
has been programmed. An internal relay
operated by a control voltage applied between
terminals A15 and A1l6 disconnects the input
to the voltage comparison amplifier aná
momentarily opens its de feedback loop when
it is energized. A capacitor in the circuit
holds the amplifier’s output voltage rela-
tively constant during the 8 milliseconds the
relay contacts are open during the transfer.
It is normal for the PS/A’s output to drift
300 to 500 millivolts during this time. If
drift is greater than this amount, try ad-
justing A1R61
mized. If the setting of AIR61 must be chang-
ed by more than a slight amount, the PS/A
will then need to be recalibrated following
the procedure of paragraph 5-103.
Effect 2 January 1st, 1977, Option 007
(10-turn voltage control) has been redesig-
nated Option 009. Make this change wherever
Option 007 is mentioned in the manual.
CHANGE 5:
The serial prefix number has been changed to
1808A. This is the only change.
CHANGE 6:
In Replaceable Parts Table, page 6-11, delete
heat sink HP P/N 5020-8401. Add heat sink
(left side), HP P/N 5020-2583 and heat sink
(right side), HP P/N 5020-2581,
CHANCE 7:
In the replaceable parts list Table 6-4 page
6-5 change Ki relay to 6 V AC/DC HP P/N
0490-1298. |
— CHANGE 8:
In the replaceable parts list, page 6-9 and
on schematic Figure 7-2 (Sheet 1), change
A3C15 to 0.2 uF, 100 V, HP P/N 0160-0818.
ERRATA:
In the replaceable parts table, page 6-5,
change A1R8 and AlLR13 to resistor variable, 5
k, 1/2 VW, 10%, cermet, HP P/N 2100-3252, qty
2.
slightly while repetitively
programming the PS/A until the drift is mini-
| ERRATA: |
in the replaeable parts list, Page 6-10,
delete Terminal Block, TQ 3, HP /
0360-1766, and in its place added Termi. .
Block, TQ 3, HP P/N 0360-2161.
- CHANGE 9:
In the manual, page 4-5 paragraph 4-36,
change reference designator R37 to R72. In
paragraph 4-37 change the first sentence to
read: At turn off, the +20 Y (unfiltered)
supply voltage is removed and relay AlK1 is
deenergized.
In the replaceable parts table under Al
Interconnect and Power Supply Board, make the
following changes: Delete: R32 fixed 1.3 k
.25 W HP P/N 0757-0735 Add: R72 fixed 18 k .5
W HP P/N 0686-1835 R73 fixed 5.1 k 5 W HP
P/N 0686-5125 CR21 Diode Si 200 prv HP P/N
1901-0327 VRL Diode, zener 11.8 V HP P/N
1902-3180 Change: C2 to 3.3 uF 15 V HP P/N
0180-2264 CRk to SCR HP P/N 1884-0074 R37 to
390 ohm 3 W HP P/N 0811-1799 |
In Figure 7-2 Sheet 1, change the schematic
as follows: В
RY HZ NFILTERED
E
$ | 390 ohm IW
Ki |
=
CR
ja я
~ SUV +69
+ ЗЕ
Che 3X. ar:
& AK
S YEN
In the replaceable parts table page 6-5 and
on the schematic Figure 7-2 Sheet 1, change
R21 to 2.61 k 1/8 W HP P/N 0698-0092 (the
value of R21 must be selected for optimum
performance). This change supersedes the
Errata change made on page 2.
CHANGE 10: |
In the replaceable parts list on page 6-5,
change Rl, 2, 3, to var, ww, 100, 10% HP P/N
2100-3349. On page 6-11, under Fro
Panel-Mechanical, change output Panel to Hi
P/N 5000-3189.
, Model 6825A Page -5-
‚ CHANGE 11:
. In the replaceable parts list, page 6-10, un-
der A5 Front Panel-Electrical, delete R2 var,
„мм, 25 К, 5%, 2 W, HP P/N 2100-3272 and add
© var, ww, 20k, 5% 2 W, qty. 1. Also, on
-.age 6-11, under Front Panel-Mechanical,
delete Knob, pointer, HP P/N 0340-1090, qty.
1., and add HP P/N 0270-1081, gty. 1. On page
6-6 delete R53 HP P/N 0698-5092. This change
obsoletes Option 009. _
о CHANGE 12:
On page 1-2, Table 1-1, change the Resolution
Spec. for Voltage (Xi Range) to Amv,and (X4
Range) to 16mv. |
CHANGE 13:
In the replaceable parts list page 6-10,
below 51, add HP P/N 5001-6715, polimide
paper insulator, qty 1. The insulator is in-
stalled over $1,
“CHANGE 14:
This change is retroactive starting with
prefix-serial number 23124 01001-01110, (see
table on page 1 of this change page).
On page 1-3, Table 1-1 Specfications, change
the Remote Resistance Programming Coefficient
п - shown below:
Resistance Coefficient:
Voltage (X1 Range): 2000ohms/V (typical)
Voltage (X4 Range): 500chms/V (typical)
On page 5-23 add the following NOTE and steps
“to paragraph 5-10.
This procedure, steps (a) through shouid be
followed to achieve optimum accuracy when
programming with an external resistance. This
procedure may not allow full scale voltage
adjustment when using the front panel VOLTAGE
control (10 turn potentiometer A2R5) on units
with a serial prefix of 23154 or above . To
adjust units with serials prefixed 23154 or
above, or any unit with a 10-turn poten-
tiometer for the voltage control, follow
steps 1 and ] unless the power supply is ex-
pected to be used in a remote programming
application.
i.) Reconnect jumper A8-A9Y and remove remote
programming connections.
J.) Check the output voltage with the VOLTAGE
control fully clockeise, The DVM should read
greater than +20V. If not, readjust AOR58 for
a DVM reading of +20.5V.
This will assure control of the output volt-
age over the full specified range when using
the front-panel control.
ERRATA:
In the Operating and Service manual, change
Section 2-19 to read as follows:
‘The power supply may be operated from either
a nominal 115 volt or 230 volt 48-63 Hz power
source. When the instrument leaves the fac-
tory, the proper internal/external voltage
selection, line cord plug, and fuse have been
installed to operate with the mains voltage,
frequency, and outlet receptacle of the
country of destination.
Make sure that the correct fuse is installed
1f the mains voltage is changed.
CHANGE 15:
In: the parts list and on the schematic,
change for the A2 board, change R3 from 714
ohms 1%, 1/4W, to (HP P/N 0811-1935) to 400
ohms (HP P/N 0811-1930) - gty of 1. В
CHANGE 16:
In the replaceable parts list and on the
schematic, change VR1 ~ VRH from 6.2V 5% (HP
P/N 1900-0777) to 6.27 2% (HP P/N 1902-0509)
(gty 4).
CHANGE 17:
In Table 1-1, under DC Output Isolation,
change float voltage to read from "+/- 300
Vde to ground" to "+/- 120 Vde to ground", —
SAFETY SUMMARY
The following general safety precautions must be observed during all phases of operation, service, and repair of this instru-
ment, Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards
of design, manufacture, and intended use of the instrument. Hewlett-Packard Company assumes no liability for the
custorner’s faiture to comply with these requirements.
BEFORE APPLYING POWER.
Verify that the product is set to match the available line
voltage and the correct fuse Is instalted.
GROUND THE INSTRUMENT.
This product is a Safety Class 1 instrument (provided with a
protective earth terminal). To minimize shock hazard, the in-
strument chassis and cabinet must be connected to an elec-
trical ground. The instrument must be connected to the ac
power supply mains through a three-conductor power cable,
with the third wire firmly connected to an electrical ground
{safety ground} at the power outist. For instruments designed
to be hard wired to the ac power lines {supoly mains}, connect
the protective earth terminal to a protective conductor before
any other connection is made. Any interruption of the protec-
tive (grounding) conductor or disconnection of the protective
earth terminal will cause a potential shock hazard that could
result in personal injury. If the instrument is 10 be energized via
an external autotransformer for voltage reduction, be certain
that the autotransformer common terminal is connected to the
neutral {earthed pole) of the ac power lines (supply mains}.
INPUT POWER MUST BE SWITCH
CONNECTED,
For instruments without a built-in line switch, the input power
lines must contain a switch or ancther adequate means for
disconnecting the instrument from the ac power lines {supply
mains).
DO NOT OPERATE iN AN EXPLOSIVE
ATMOSPHERE.
Do not operate the instrument in the presence of flammabie
gases or fumes,
KEEP AWAY FROM LIVE CIRCUITS.
Operating personnel must not remove instrument covers.
Component replacement and intemal adjustments must be
made by qualified service personnel, Do not replace com-
ponents with power cable connected. Under certain condi-
tions, dangerous voltages may exist even with the power cable
removed. To avoid injuries, always disconnect power,
discharge circuits and remove external voltage sources before
touching components.
DO NOT SERVICE OR ADJUST ALONE.
Do not attempt internal service or adjustment uniess another
person, capable of rendering first aid and resuscitation, is
present.
DO NOT EXCEED INPUT RATINGS.
This instrument may be equipped with a line filter to reduce
electromagnetic interference and must be connected to a pro-
perly grounded receptacle to minimize electric shock hazard.
Operation at line voltages or frequencies in excess of those
stated on the data plate may cause leakage currents in excess
of 5.0 mA peak.
SAFETY SYMBOLS.
Instruction manual symbol: the product
AN wili be marked with this symbol when it
is necessary for the user to refer to the
instruction manual {refer to Table of
Contents].
Indicates hazardous voltages.
Indicate earth {ground) terminal.
>
orde
The WARNING sign denotes a hazard. it
| WARNING | calls attention to a procedure, practice,
or the like, which, if not correctly per-
formed or adhered to, could result in
personal injury. Do not proceed beyond
a WARNING sign until the indicated
conditions are fully understood and met.
Su $ The CAUTION sign denotes a hazard. №
CAUTION { calls attention to an operating pro-
E] ocedure, or the like, which, if not corect-
ly performed or adhered to, could result
"in damage to or destruction of part or ail
of the product, Do not proceed beyond
a CAUTION sign until the indicated con-
ditions are fully understood and met.
4
DO NOT SUBSTITUTE PARTS OR
MODIFY INSTRUMENT.
Because of the danger of introducing additional hazards, do
not install substitute parts or perform any unauthorized
modification to the instrument. Return the instrument to a
Hewlett-Packard Sales and Service Office for service and
repair to ensure that safety features are maintained.
Instruments which appear damaged or defective should be made inoperative and secured against unintended operation until
they can be repaired by qualified service personne.
TABLE OF CONTENTS
PAGE PAGE
GENERAL INFORMATION corinne vienna, 1-1 PRINCIPLES OF OPERATION ............enmn eme ens, 4-1
1-1 Description .............. 2... meneerreremien ree ere 4-1 4-1 Overall Description... ron menes 4-1
1-3 Power Supply Features …..….….…..….………ereraccerares AEG +. 1-1 4.2 (Зепега! Le……surrerressaeeucrenersrecrareenencera er ensa rade een rene ee 4-1
1-7 Amplifier Features ................ emm... —eeniones 1-1 4-4 Block Diagram Description ................ eme 4-2
1.10 Meters oo ponomnacenancooceno a ereaaverrines 1-1 4-15 Constant Voltage/Constant Current Operation .......... 4-3
1:32 Specifications..............e.eeeesninenerer e 1-1 4-18 Detailed Circuit Descriptions 0 0". 4-4
1-14 Options ................—..emeeen ener nn 15 4-19 General ......... me... EEE EEE —
1-16 ACCESSOTries .....e....emeccereecanercenerarareotaneneracarea sovenneuvaues 15 4-21 Output Power Amplifier Circuits 5
1-18 Instrument Identification ere siemens 1-5 (Figure 7-2, Sheet 1}... 4-4
1-21 Ordering Additional Manuals .ncsecersrrirrnens sxrassauacnue 1-5 4-40 Voltage and Current Control Circuits ©
INSTALLATION ars EEE EEE EEE 2-1 (Figure 7-2, Sheet 21.............. 4-6
2-1 Initial INSPECtION .....……ureonrrererucrennannsunnentenan srsssavronans 2-1 |
2-3 Mechanical Check ......... .. A 1 MAINTENANCE ......i..errmacaococanenraronersoneatocarnenenanoer enn crane 5-1
2-5 Electrical Check ..................erecencroacine en icce recaen 2-1 51 Introduction ........———e—...eírenecanarroerenanrerac een 5-1
2-7 Repackaging for Shipment …….……urenrerameserenmecess 2-1 5-3 Test Equipment Required ................. e... rece. 5-1
2-9 Instaliation Data... rer coarseness 2-1 5-5 Perforrnance Test …….......…..ererseceensarecnensessararaaseoatone 5-2
2-11 Location......................... … ... 2-1 5-7 Power Supply Mode Tests ..............eseee.e.eeereeicacearees 5-2
2-13 Outline Diagramm essen rer EEE ERREGER 2-1 5-42 Constant Current Tests ...................—ee—eoneceniereacacenóans 5-8
215 Rack Mounting ......................rieneeere meme een. 2-1 556 Armplifier Mode Tests rer EEE BERATEN EEE 5-12
2-17 input Power Requirements ….…erceracerenveanmmansas 2-2 560 Troubleshooting.............. corenceruers ons 5-13
N 2-2 5-61 General ,..............memiermerin nero ere enenineniroeraocenenere 5
5-54 Overall Trouble Isolation Procedure................ ee {
OPERATING INSTRUCTIONS ...............ecomeaciieseican mee 3-1 5-71 AZ Board Troubleshooting................————.—.—... 51
31 Introduction .................. rem rreen rre ren ere 3-1 5-76 A3Boardand Heat Sink
33 Rear Terminals and AC Input ........... 371 Assembly Troubleshooting ........e. e... 5-19
35 Operating Controls and Indicators ...................—..... 3-1 5-82 Degraded Performance Problems..................e.eeenecene0. 5.20
3-6 Mode Switch ..............e... eme .esoorencener rene recen cee 3-1 5-84 Repair and Replacement ..............e.eocconienne ener 5-21
3-10 Range Switch .....................esresnaccrocencarcapentaveree ere. 3-2 5-86 Covers and Front Panel ................e.. nece iite re e DDD 5-21
3-12 Voltage Controi ss co меннее 3:2 5-92 — Rear Heat Sink Assembly …….….………cereerranensennenesnse 5-22
3-14 Current Contral courrier erase serene rans 32 5-98 Adjustment and Calibration ..... anenoaoreon rece anracreo e raemea 5.23
318 Voltage Metering ....................—..e... cancers encres encens AO 5100 Meter Zero......... jenvecserererssnsn sas sseeuce eisai 523
3:18 Current Metering ........... ... ero eee 33 5-102 Constant Voltage Calibration ............ e... recen 5-23
3-20 | Turn-on Checkout PrOCEQUTES..………cesiarersemesmennnns 3-3 5-106 Constant Current Calibration .................—..— ever... 5-24
3-22 Operating Modes ........................ reoionnenooo. 3-8 5-109 AC Meter Calibration ...................er 2000000 e 5-24
3-24 Local Programming... .. veer SR
329 Operation of Supply Beyond Rated Output............. 3-5 REPLACEABLE PARTS N
3.31 Reactive Load ConsideratioNS ers . 35 6-1 introduction........ i 6-1
3-33 Connecting Load ......................eereerareiacce rate 35 6-3 Ordering Information e... «a ranarenceareure 6-1
3-37 Remote Sensing ...…......…....….…….……rencescserarcescanes .... 35
340 Remote Programming......….….………sressenanenemence 36 CIRCUIT DIAGRAMS.......…................uncconcrncre KERNE 7-1
3-53 — Series and Parallel Connections ...............—.. em... 3-8 7-1 Introduction... e... ee ceinenraees ss ssnsns vonsensrneneense 7-1
3-57 Auto-Series and Auto-Parallel Connections .............. 310 73 Simplified Schematic Diagram.................... vereis 7
362 Bipolar Overvoltage and Overcurrent Limit ............. 311 75 - Component Location lllustrations ............. .......—.—... 7-1
364 Reverse Voltage and Current Loading ............—..... 311 77 Schematic Diagrams ..................ericienernre recreos 7-1
SECTION!
GENERAL INFORMATION
7-1 DESCRIPTION
1-2 This instruction manual contains operating and
service instructions for Bipolar Power Suppiy/Amplifier
Mode! 6825A. The Bipolar Power Suppiy/Amplifier
(BPS/A) is a general purpose instrument useful in any lab-
Oratory engaged in the research and development of elec-
tronic systems, circuitry, or components, The BPS/A can
be operated as a power supply or as an amplifier. Terminals
on the rear terminal strip permit access to various internal
control points to further expand the operational capabilities
of the unit. The resulting flexibility iends the BPS/A to an
almost unlimited number of applications. Some of these
applications are outlined in Section HI of this manual. The
following paragraphs describe some of the features of the
BPS/A as a power supply and as an amplifier,
13 POWER SUPPLY FEATURES
1-4 The unit can be made to function as a regulated de
power supply by setting the front panel MODE switch to
the POWER SUPPLY position, The supply can furnish
‘either a Constant Voltage output or Constant Current out-
put. The dc output is bipolar and is continuousiy adjustable
from its maximum rated positive value to an equal negative
continuously through zero. A crossover feature automati-
cally changes the supply from constant voltage to constant
current operation at a preset or programmed voltage/current
point. The front pane! CURRENT MODE indicator lights
for constant current operation, Both the supply and the
load are protected against overvoltage and overcurrent
conditions by internal circuits, Dual output voltage ranges
are provided for better resolution. The front panel RANGE
switch allows selection of the high {X4) or low (X1} output
range.
1-5 The output voltage can be programmed locaily
using the front panel VOLTAGE control, or remotely, by
means of a resistance connected to the appropriate rear ter-
minals. The output current can be programmed locally us.
ing the front panel CURRENT control, or remotely, by
means of a resistance or voitage source connected to the
appropriate rear terminals. The BPS/A can be programmed
(controlled) at a very high rate of speed (less than 5Ousec
for output voltage change over the entire voltage span).
Local and remote programming connections are described
in Section IH, The output voltage and current ranges are
as follows:
—5V to +5V at 0 to 2.0A {low range}
~20V 10 +20V at 0 to 2.0A {high range}
1-6 The BPS/A can sink, as well as source current, per-
mitting it to serve as a variable load device. The BPS/A can
sink up to 50% of the rated output current.
1-7 AMPLIFIER FEATURES
1-8 The unit can be made to function as a variable gain
or a fixed gain amplifier by setting the MODE switch to the
VAR GAIN AMP or FXD GAIN AMP position. When oper-
ating as an amplifier, the BPS/A can amplify externally ap-
plied ac or de signals. Variable gain can be controlled local
iy (VOLTAGE control) or remotely and is accurate to 0.1%.
The variable or fixed gain provided is as follows:
Variable Gain - 0-2 How range), 0-8 (high range)
Fixed Gain — 1X {low range}, 4X (high range)
1-9 The variable gain amplifier is non-inverting and has
a frequency response from de to 15kHz, The fixed gain am-
plifier is inverting and has a frequency response from dc to
40kHz. Total harmonic distortion is 0.1% (maximum).
1-10 METERS
1-11 A voltmeter and an ammeter on the front panel
monitor the ac or dc output voltage and current respective-
ty. Associated front panel VOLTAGE METER and CUR-
RENT METER switches allow the meters to monitor either
an ac or de output and also provide dual range monitoring
capability for better resolution. The de meter accuracy is
T+3% of full scale and the ac meter accuracy is 165% of full
scale, |
1-12 SPECIFICATIONS
1-13 Detailed specifications for this model are given in
Table 1-1,
Table 1-1. Specifications, Model 6825A
GENERAL SPECIFICATIONS
input Power:
104-127/208-254Vac (switchable), 48-53Hz, 1.0A,
150W
Meters:
Individual voltage and current meters, DC accuracy is
3% of full scale. AC accuracy is 5% of full scale with
sinusoidal, 100Hz input.
Meter Ranges {DC):
+2.4V, +24V/£0.24A, +2.4A
Meter Ranges (AC):
1.8Y funcal), 16Y rms/0.16A rms, 1.6A rms
Temperature Ratings:
Operating: 0 to 55°C.
Storage: —40 to +75°C.
Cooling:
Convection cooling is employed. The supplies have no
moving parts.
Dimensions:
See outline diagram, Figure 2-1.
Weight:
18 fbs. (8.2 kg.) net, 21 lbs. {9.5 kg.) shipping.
POWER SUPPLY SPECIFICATIONS
DC Output:
Voltage and current spans indicate range over which
output may be varied, -
X1 Range: —5V to +5V, G to 2.0A
X4 Range: —20V to +20Y, O to 2.0A
Load Effect (Load Regulation):
Voltage load effect is given for a load current change
equal to the current rating of the supply. Current load
effect is given far a load voltage change equal to the
voltage rating of the supply.
Voltage (X1 Range): 0.01% + 1mV
Voltage (X4 Range): 0.01% + .5mV
Current: .01% + 250uA
Source Effect (Line Regulation):
For a change in line voltage between 104 and 127Vac/
208 and 254Vac at any output voltage and current
within rating.
Source Effect (Line Regulation) Continued:
Voltage (X1 Range): .01% + .2mV
Voltage (X4 Range): .01% + 2mV
Current: 01% + 250uA
PARD {Ripple and Noise):
Ams/p-p (20Hz to 20MHz) at any line voltage and un-
der any load condition within rating.
Voltage (X1 Range): 1.5mV rms/4mV p-p
Voltage (X4 Range): BmV rms/15mV p-p
Current: 3mA rms/10mA pp i
Temperature Coefficient:
Output change per degree Centigrade change in am-
bient following 30 minutes warm-up.
Voltage {X1 Range): .01% + 35mV
Voltage (X4 Range): .01% + 1.5mV
Current: .02% + 100uA
Drift {Stability}:
Change in output ide to 20Hz) aver 8 hour interval
under constant line, load, and ambient following 30
minutes warm-up.
Voltage (X1 Range): .03% + 1mV (Pot wiper jump
effect may add 5mV) В
Voltage {X4 Range): .03% + 5mV (Pot wiper jur. a
effect may add 50mV) ~~
Current: .1% + 200uA (Pot wiper jump effect may
add 1,5mA}
Load Effect Transient Recovery (Load Transient
Recovery):
Time required for output voltage recovery to within
the specified leve! of the nomina! output voltage
following a change in output current equal to the
current rating of the supply:
100usec is required for output voltage recovery within
20mY of nominal output voltage.
Resolution:
Typical output voltage or current change that can be
obtained using front pane! controls.
Voltage (X1 Range): 10mY
Voitage (X4 Range): 40mV
Current: 3mA
Output impedance {Typical to 50kHz):
Approximated by a resistance in series with an induc:
tance {constant voitage operation).
Bm & 1.5uH
Table 1-1. Specifications, Model 6825A (Continued)
POWER SUPPLY SPECIFICATIONS (Continued)
DC Output Isolation:
Supply may be floated at up to 300V above ground.
Remote Resistance Programming:
Resistance Coefficient:
Voltage (X1 Range): 20000/V + 1%
Voltage (X4 Range): 50082/V + .1%
Current: BO/mA 1.1%
Remote Programming Speed:
SOusec are required to change between 1% and 99% of
the maximum + and — voitage limits.
Remote Programming Temperature Coefficient:
bient using an external control resistor {Rg) at output
voltage (VO) or current (Ig), % T.C. Rp is the tem-
perature coefficient of the control resistance RE.
Voltage (X1 Range): .25mV + 007% (Vo) +
% T.C. RE {Vp + 5)
1mV + .007% (VO) +
% T.C. Rg {Vo + 20)
Current: .018% (ig) + 33LA +% T1.C. Rf (ip)
Voltage (X4 Range);
Sink Current Comnliance:
Maximum current that the supply can sink when con-
nected to an active load.
\
fm —
/
/
/ SINK
/
/ -2A O 1
|
| SOURCE
|
||
не mn |
Sink current is limited to a value ranging linearly from
2А @ ОУ то 1А ®20V.
Externally applied voltages to output terminals in ex-
cess of 25Y could damage the instrument,
POWER AMPLIFIER SPECIFICATIONS
Output: |
Voltage UX1 Rangel: 10V pp
Voltage (X4 Range): 40V p-p
Current: 2A peak
Voltage Gain {High/Low Range):
Fixed Amplifier {Inverting): 4X (high range)/
1X (low range}
Variable Gain (Non-Inverting): 0-8 (high rangel/
0-2 (low range)
Frequency Response (+1, .3dB at full output):
Fixed Gain: de — 40kHz
Variable Gain: dc — 15kH2
Distortion:
Total harmonic distortion is . 1% (maximum) at 100Hz
and full output.
input Impedance:
10K £2 (Typical)
Fixed Gain Accuracy (at 100Hz):
Low Range (X1): .1% +.5mV
High Range (X4): ‚1% + 2mV
Remote Resistance Programming Variable Gain (Ay):
" KRE
— 10.24 x 1039
cated and Rp is the external control resistance.
Rg
10.24 x 103
Ay . where K is the constant indi-
Ay at low range (X1):
4RE
Av at high range (X4): ————
у gh rang 10.24 x 103
Variable Gain Accuracy:
Accuracy in high range at 100Hz using an external
control resistance (Rg) at output voltage (VQ). %
Re is the accuracy of the control resistance RE.
(05% + »AF) VO + 2.5mY
Remote Voitage Control Coefficient:
Fixed gain amplifier mode, voltage coefficient:
Voltage (X1 Range): 1 voit/voit 1%
Voltage (X4 Range): 4 volts/voit + 1%
Variable gain amplifier mode (VOLTAGE control
fully clockwise}, voltage coefficient;
Voltage (Xi Range): 2 voits/voit + ,1%
Voltage (X4 Range): 8 volts/volt 4.1%
Constant Current, voltage coefficient (the following
applies to variable gain amplifier, fixed gain amplifier,
and power supply modes of operation):
2 amperes/voit + 5%
1-3
1-14 OPTIONS
1-15 Options are customer-requested factory modifica:
tions of a standard instrument. The option described below
applies to Mode! 6825A.
Option No. Description
007 Ten-turn Output Voltage Control: Replaces
standard single-turn voltage contro! to allow
greater resolution in setting the output volt-
age of supply.
1-16 ACCESSORIES
1-17 The accessories listed in the following chart may
be ordered with the instrument or separately from your
loca! Hewlett-Packard sales office {refer to list at rear of
manual for addresses).
HP Part No, Descritpion
5060-8762 Dual Rack Adapter: Kit for rack mounting
one or two supplies in standard 19-inch rack.
5060-8769 Blank Panel: Filler panei to block unused
half of rack when mounting only one supply.
11057A Carrying handle easily attached for portabil-
ity and handiing convenience.
10524 Combining Case for mounting one or two
units in standard 19-inch rack.
5060-0789 Cooling kit for above combining case, 115
Vac, 50-60Hz.
5060-0796 Cooling kit for above combining case, 230
Var, 50-50Hz.
1-4
1-19
1-18 INSTRUMENT IDENTIFICATION
Hewlett-Packard power supplies are identified by a
three-part serial number. The first part is th? power supply
model number. The second part is the serial number prefix,
consisting of a number-letter combination denoting the date
of a significant design change and the country of manufac
ture. The first two digits indicate the year (12 = 1972, 13
= 1973, 20 = 1980, etc.); the second two digits indicate the
week (01 through 52); and the letter “A”, “G", "J", or PU"
designates the U.S.A., West Germany, Japan, or the United
Kingdom, respectively, as the country of manufacture. The
third part is the power supply serial number; a different 5
digit sequential number is assigned to each power supply,
starting with 00101,
1-20 if the serial number prefix on your unit does not
agree with the prefix on the title page of this manual, change
sheets supplied with the manual or manual backdating
changes in Appendix A define the differences between your
instrument and the instrument described by this manual.
1-21 ORDERING ADDITIONAL MANUALS
1-22 One manual is shipped with each instrument. Add-
itional manuals may be purchased from your local Hewlett-
Packard field office (see list at rear of this manual for add-
resses). Specify the model number, serial number prefix,
and HP part number shown on the titie page.
SECTION I!
INSTALLATION
2-1 INITIAL INSPECTION
2-2 Before shipment, this instrument was inspected and
found to be free of mechanical and electrical defects. As
soon as the instrument is received, proceed as instructed in
the following paragraphs.
2-3 MECHANICAL CHECK
2-4 if external damage to the shipping carton is evident,
ask the carrier’s agent to be present when the instrument is
unpacked. Check the instrument for external damage such
as broken controls or connectors, and dents or scratches on
the panel surfaces. If the instrument is damaged, file a claim
with the carrier's agent and notify your local Hewlett-Packard
Sales and Service Office as soon as possible {see list at rear of
this manual for addresses).
25 ELECTRICAL CHECK
2-6 Check the electrical performance of the instrument
contains performance check procedures which will verify in-
strument operation within the specifications stated in Table
1-1. This check is also suitable for incoming quality control
inspection. Refer to the inside front cover of the manual
for the Certification and Warranty statements,
2-7 REPACKAGING FOR SHIPMENT
2-8 To insure safe shipment of the instrument, it is
recommended that the package designed for the instrument
be used. The original packaging material is reusable. If it is
not available, contact your local Hewlett-Packard field office
to obtain the materials. This office will also furnish the add-
ress of the nearest service office to which the instrument can
be shipped. Be sure to attach a tag to the instrument speci-
fying the owner, model number, full serial number, and ser-
vice required, or a brief description of the trouble,
29 INSTALLATION DATA
2-10 The instrument is shipped ready for bench opera-
tion, His necessary only to connect the instrument to a
source of power and it is ready for operation.
2-1
2.11 LOCATION
2-12 This instrument is convection cooled. Sufficient
space should be allotted so that a free flow of cooling air
can reach the top and rear of the instrument when itis in
operation. !t should be used in an area where the ambient
temperature remains between 0°C and +55°C.
2-13 OUTLINE DIAGRAM
214 — Figure 2-1 illustrates the outline shape and dimen-
sions of the BPS/A.
TERMINAL STRIP DETAIL | Tor
OUTPUT
TERM
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Figure 2-1. Outline Diagram
2:15 RACK MOUNTING
2.16 The BPS/A may be rack mounted using either the
dual rack adapter kit or the combining case (with appropri-
ate cooling kit) described in Paragraph 1-16. The necessary
installation instructions are provided with the accessories.
Refer to Paragraph 5-91 before proceeding with the rack
mounting installation instructions.
2-17 INPUT POWER REQUIREMENTS
2-18 The BPS/À may be operated continuously from
either a nominal 120 voit or 240 voit, 48-63Hz power
source, A two-position selector switch { § } located with-
in the ac power module on the rear panel selects the power
source, Before connecting the instrument to the power
source, check that the selector switch setting. matches the
nominal line voltage of the source. If required, move the
switch to the other position. Note that the power cable
must be removed, the plastic door on the power module
must be moved aside, the fuse extractor must be pulled out-
ward and the fuse must be removed in order to gain access
to the selector switch.
2-19 When the instrument leaves the factory, the proper
fuse is installed for 115 volt operation. An envelope con-
taining a fuse for 230 voit operation is attached to the instru. |
ment. Make sure that the correct fuse is instalied if the
2-2
2-22
position of the slide switch is changed (2A for 115 volt ap-
. eration, and 1A for 230 volt operation).
2-20 POWER CABLE
2-21 To protect operating personnel, the National Elec-
trical Manufacturers’ Association (NEMA) recommends that
the instrument panel and cabinet be grounded. This instru
ment is equipped with a three conductor power cable. The
third conductor is the ground conductor and when the cabie
is plugged into an appropriate receptacle, the instrument is
grounded. The offset pin on the power cable's three-prong
connector is the ground connection.
To preserve the protection feature when operating
the instrument from a two-contact outlet, use a three-prong
to two-prong adapter and connect the green lead on the.
adapter to ground.
SECTION HI
OPERATING INSTRUCTIONS
POWER MODULE
STRAPS
STRAPS
Figure 3-1. Bipalar Power Supply/Amplifier, Rear View
3-1 INTRODUCTION
32 This section describes the operating controls and
indicators, the turn-on checkout sequence, and operating
modes of the Bipolar Power Supply/Amplitier (BPS/A),
Loca! and remote programming operations are aiso des-
cribed.
3-3 REAR TERMINALS AND AC INPUT
3-4 The Bipolar Power Supply/Amplifier (BPS/A) is
shipped with the rear terminals strapped for local program-
ming (using front panel controls) as shown in Figure 3-1.
Remote programming strapping requirements are described
in subsequent paragraphs. The power module contains fuse
F1 {2A for 115Vac or 1A for 230Vac} and a slide switch for
connecting 115Vac or 230Vac input power to the instru-
ment. To turn on the BPS/A, set the LINE switch {item
(1) . Figure 3-2) to ON. The LINE ON indicator
31
should light. Fuse F1 protects the main power supply. At
initial turn-on, an internal circuit protects any loads con-
nected to the BPS/A from turn-on transients by shorting
the output terminals and disabling the BPS/A's power out-
put circuits. This circuit operates similarly at turn-off to
protect any loads from turn-off transients.
35 OPERATING CONTROLS AND
INDICATORS
36 MODE SWITCH
37 The MODE switch (3) allows the BPS/A to oper-
ate as a power supply, variable gain amplifier, or a fixed gain
amplifier. In power supply operation, the BPS/A provides
a variabie bipolar de output voltage dependent upon the
RANGE switch (4) and VOLTAGE control (5) set-
tings. The dc output voltage ranges are as follows:
-5V to +5V {low range) and —20V to +20V (high range).
VA
TES
clan TU
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a e
Y
: js y ; и AA BIPOLAR BOWE RSUPPLY AMPLIFIER RE mba demo OMR aran E
+ > HEWLETT + MACrARA *
ional
Fry MA
ESA
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Figure 3-2. Operating Controls and Indicators {Typical BPS/A)
3-8 In variable gain amplifier operation, the BPS/A can
amplify or attenuate an external input signal (de to 18kHz)
applied to the Ml and LO IN terminals. The gain is variable
from 0 to a maximum depending upon the RANGE switch
(9) and VOLTAGE contro! (5) settings. The variable
gain ranges are as follows: 0-2 (low range) and 0-8 (high
range).
3-9 In fixed gain amplifier operation, the BPS/A inverts
and amplifies an external input signal applied to the Hi and
LO IN terminals. For fixed gain amplifier operation, the
BPS/A has a frequency response from DC to 40kHz, The
fixed voltage gain provided in the high or low output range
is as follows: times 1 {low range} and times 4 (high range).
3-10 RANGE SWITCH
3:11 The RANGE switch (4) allows selection of the
high (X4) or low (X1) output ranges for power supply,
variable gain amplifier, or fixed gain amplifier operation.
The REMOTE position allows the high or low range to be
externaliy selected via the rear terminal strip (see Paragraph
3-45).
3-2
3-12 VOLTAGE CONTROL
3-13 The VOLTAGE control (5) controls the output
level (power supply operation) or gain {variable gain ampli-
fier operation] of the BPS/A. in power supply operation,
the VOLTAGE control varies the output voltage from a
maximum negative value (full counterclockwise} through
zero {midposition) to a maximum positive value {full ciock-
wise). In variable gain amplifier operation, the gain is vari-
able from zero 10 the maximum gain as the VOLTAGE con-
tro! is varied from full counterclockwise to full clockwise.
in fixed gain amplifier operation, the VOLTAGE contro!
does not contro! circuit operation.
3-14 CURRENT CONTROL
3-15 The CURRENT control (6) sets the constant
current output of the BPS/A. This control is operable in all
three modes of operation {power supply, variable gain ampli-
fier, and fixed vain amplifier} and controls the output cur-
rent from 0 to the maximum rated output. When the instru-
ment switches from constant voltage to constant current
operation, the CURRENT MODE indicator lights.
Selection of constant voltage or constant current operation
is described in Paragraphs 3-27 and 3-28.
3-16 VOLTAGE METERING
3-17
itoring the DC or AC output voltage on voitmeter
The shaded area on the voltmeter face indicates the amount
of output voltage that is available in excess of the normal
rated output. The voltmeter upper scale reads the bipolar
DC voltage from a maximum negative value through OV to
a maximum positive value, DC accuracy is +3% of full scale.
The lower scale reads the RMS output voltage from 0 to a
maximum level. AC accuracy is 15% of fuli scale. The volt-
meter ranges selected by the VOLTAGE METER switch are
as follows:
DC AC(RMS)
O0 to + 2,4V, O to 1.6V (uncal),
0 to + 24V D to 16V
318 CURRENT METERING
3-19 The CURRENT METER switch permits
monitoring the DC or AC output current on ammeter
The shaded area on the ammeter face indicates the amount
of output current that is available in excess of the normal
rated output. The ammeter upper scale reads the bipolar
DC current from a maximum negative value through OA to
a maximum positive value. DC accuracy is 3% of full scale.
The lower scale reads the RMS output current from O to a
maximum level. AC accuracy is 25% of full scale. The am-
meter ranges selected by the CURRENT METER switch
are as follows:
DC ACIRMS)
Oto + 0.24A, 0 to 0.16A,
Oto + 2.4А 0 to 1.6A
3-20 TURN-ON CHECKOUT PROCEDURES
CAUTION
Bear terminal strip cover must be in place when
instrument is in use.
3-21 The following turn-on and checkout procedures
are performed utilizing the front panel controls {Figure 3-2)
and the normal rear terminal strapping connections as re-
ceived from the factory. Also, the Local/Auto switch, lo-
cated inside the instrument on board AZ, is in the Local
position {pushed to the right or toward the rear of the in-
strument) as received from the factory. The AUTO position
is used for auto-series and auto-paralle! operations (see
The VOLTAGE METER switch permits mon-
3-3
Paragraphs 3-57 through 3-61). The following procedures
check both power suppiy and amplifier to ensure that the
BPS/A is operational, |
POWER SUPPLY CHECKOUT PROCEDURE
a. Set front banel controls as follows:
MODE switch (D POWER SUPPLY
RANGE switch (4) — X1
VOLTAGE control (5) — midposition
CURRENT contro! (6) ~ full clockwise
VOLTAGE METER switch (8) — low range DC
CURRENT METER switch (10) — high range DC
b. Set LINE switch (0) to ON and observe that
LINE ON indicator (2) fights.
с. Adjust VOLTAGE control ® from full counter-
clockwise {—} to full clockwise {+} range through OV and
note that maximum output is attained as indicated on meter
d. Set VOLTAGE-METER switch to high range
DC and RANGE switch (4) to X4 position.
e. Adjust VOLTAGE control © clockwise and
counterclockwise through entire bipolar output voltage
range through O and note that maximum output is attained
as indicated on meter (9) Adjust output voltage to
+20V.
f. To checkout the constant current circuit, first tum
off BPS/A. Short circuit the front panei terminals {Hi OUT
to LO QUT).
g. Turn on supply and observe that CURRENT MODE
indicator @ lights and meter © indicates near 0 volts,
h. Adjust CURRENT control (6) from full cw to
full cow and note that minimum current is attained as mdi-
cated on meter
1. Turn off supply and remove short from output term-
nals.
j Turn on supply and adjust VOLTAGE CONTROL
for an output of —20V.
к. Turn off supply and reconnect short across the HI
and LO OUT terminals.
I. Turn on supply and note that CURRENT MODE in-
dicator lights and meter indicates O volts,
m. Adjust CURRENT control (6) from full ew to
full cow and note that minimum current is attained as indi-
cated on meter
n. Turn off BPS/À and remove short from output term-
inais.
VARIABLE GAIN AMPLIFIER CHECKOUT PROCEDURE
o. Set front panel controls as follows:
MODE switch (3) — VAR GAIN AMP
RANGE switch (4) - X1
VOLTAGE control (5) — midposttion
CURRENT control (6) — fuit clockwise
VOLTAGE METER switch (8) — low range AC
CURRENT METER switch (1Q — high range AC
р. Connect a 1.75V rms, 100Hz input signal to the
front pane! input terminals (H] and LO IN).
q. Turn on supply and adjust VOLTAGE control O
through entire RMS range and note that maximum voltage
is attained as indicated on meter (9)
r. Set VOLTAGE METER switch to high range
AC, RANGE switch (4) to X4, and adjust VOLTAGE
control ® through entire RMS range and note that max-
imum voltage is attained as indicated on meter
FIXED GAIN AMPLIFIER CHECKOUT PROCEDURES
s. Set MODE switch (3) to FXD GAIN AMP posi-
tion and increase input signal to 3.5V rms.
t. Adiust VOLTAGE control (5) through entire
RMS range and note that maximum voltage is attained as
indicated on meter ©)
3-22 OPERATING MODES
CAUTION
Hear terminal strip cover must be in place when
instrument is in use.
3-23 The position of the front panel! MODE switch de-
termines whether the instrument will be used as a power
supply or an amplifier. in addition, the instrument may be
controlled ¡ocaliy using the front panel VOLTAGE and
CURRENT controls or remotely via terminals on the rear
of the unit. The front pane! output terminals (HI and LO
OUT) and input terminals {Hl and LO IN) are repeated as
(+ and —) and (A1 and A2) respectively on the rear termin-
al strip. The rear terminal strip includes sensing (+5 and —S)
terminals and other terminals for remote control of the
BPS/A as shown in Figure 3-3. These terminals connect to
various control points within the instrument and allow
SENSE
TERMINALS
SIGNAL INPUT
TERMINALS
(17 (LO) 10 (НВ
Al AZ + -$ - +% +
ве ооо
REMOTE RANGE
CONTROL
OUTPUT
TERMINALS
CONSTANT
VOLTAGE
PROGRAMMING
1+7 CONSTANT
CURRENT
PROGRAMMING
+
A as AIG Ai) AIZ AIS AIS
2200.00)
CONSTANT CURRENT
FLAG QUTPUT
PROGRAM INTERRUPT (+) CONSTANT
RELAY CONTROL CURRENT PROGRAMMING
À
‘АВ MEAT BE M9 AZ0 AZIY
21222922
+
Figure 3-3. Rear Terminal Strip
strapping connections to be made which enable the power
supply or amplifier to be utilized in many applications. The
following paragraphs describe the procedures for utilizing
the various operational capabilities of the power supply, A
more theoretical description concerning the operational
features of this supply is contained in Application Note 80
and in various Tech. Letters. Copies of these can be obtained
from your local Hewlett-Packard field office.
4
324 LOCAL PROGRAMMING
325 The BPS/A is shipped with its rear terminal strap-
ping connections arranged for constant voltage/constant
current, local programming, focal sensing, single unit mode
of operation. This strapping pattern is ¡llustrated in Figure
34. Also, the Local/Auto switch on board A2 {see Para-
graph 3-54) is in the Local position when the instrument is
shipped from the factory. This switch must be in the Local
position for single unit mode of operation.
326 The operator selects either power supply, variable
gain amplifier, or fixed gain amplifier operation (MODE
switch) and also selects either constant voltage or a constant
current output using the front panel VOLTAGE and CUR.
RENT controls {for local programming, no strapping changes
are required). Constant voltage or constant current opera-
tion are selected as described in the following paragraphs.
АВ ÁS AID AN AlZ AIS Atd
lallelelalalel
AIS AIG Al? AB AI9 A20 A2!
ejeje aaa
ud UY
Figure 34. Normal Strapping Pattern
{LOCAL Programming)
327 Constant Voltage, To select a constant voltage
output, proceed as follows:
a. Remove load from output terminals; turn-on supply
and adjust VOLTAGE control for desired output voltage.
b. Short output terminals and adjust CURRENT con-
trol for maximum output current aliowable (current limit)
in step (a). If aload change takes place and causes the out-
put current to exceed this setting, the power supply will
automatically crossover to constant current mode and out-
put current will be constant at the level set by the CURRENT
control. The CURRENT MODE indicator will come on and
output voltage will drop proportionately to maintain con-
stant current.
3-28 Constant Current. To select a constant current
output, proceed as follows: |
a. Short output terminals and adjust CURRENT con-
trol for desired output current.
b. Open output terminals and adjust VOLTAGE con-
trot for maximum output voltage allowable as determined
by load conditions and current selected in step (a). if a
load change causes the voltage to rise, the power supply will
automatically crossover to constant voltage at the voltage
setting and output current will drop proportionately.
3-29 OPERATION OF SUPPLY BEYOND RATED
OUTPUT
330 The shaded area on the front panel meters indicate
the amount of output voitage and current that is available
in excess of normal rated output. Although, the BPS/A can
be operated in this region without damage, it cannot be
guaranteed to meet all of its performance specifications,
3-31 REACTIVE LOAD CONSIDERATIONS
3-32 The life and performance of the instrument can
be preserved if the following simple precaution is observed
when driving reactive loads. Always set/program the VOLT-
AGE control for zero output before removing a capacitive
load or interrupting an inductive load.
3-33 CONNECTING LOAD
3-34 Each load should be connected to the power sup-
ply output terminals (front or rear) using separate pairs of
connecting wires. This will minimize mutual coupling ef-
fects between loads and will retain full advantage of the
low output impedance of the power supply. Each pair of
connecting wires should be as short as possible and twisted
or shielded to reduce noise pickup. (If a shielded pair is
used, connect the shieid to ground at the power supply and
leave the other end unconnected.)
3-35 if load considerations reguire that the output power
distribution terminals be remotely located from the power
supply, then the power supply output terminals should be
connected to the remote distribution terminals via a pair of
twisted or shielded wires and each load should be separately
connected to the remote distribution terminals. For this
35
case, remote sensing should be used. (Refer to Paragraph
3-39). |
3-36 Always use two leads to connect the load to the
supply, regardless of where the setup is grounded. This will
eliminate any possibility of output current retusn paths
through the power source ground. The supply can also be
operated up to 300Vdc above ground if neither output ter-
minal is grounded.
3-37 REMOTE SENSING
3-38 Remote sensing is used to maintain good regulation
at the load and reduce the degradation of regulation which
wouid occur due to the voltage drop in the leads between
the power supply and the load. Remote sensing is accom-
plished by utilizing the strapping pattern shown in Figure
35, The power supply should be turned off before chang-
ing strapping patterns. The leads from the sensing (+S)
terminals to the load will carry much less current than the
load leads and it is not required that these leads be as heavy
as the load leads. However, they must be twisted or shielded
10 minimize noise pickup.
CAUTION
Observe polarity when connecting sense leads
to the load.
Al AZ + 45 — +5 + | £
2121919191919!
AA
Ry
АВ А9 АЮ АН Al2 AI3 Alá
llelelelalelp!
AB AIG AI? AIB AIS A2CAEI!
21212121999)
Figure 3-5. Remote Load Sensing
3-39 For reasonable inad lead lengths, remote sensing
limits degradation of the performance of the supply. How-
ever, if the load is located a considerable distance from the
supply, added precautions must be observed 1o obtain satis.
factory operation. Notice that the voltage drop in the ioad
leads subtracts directly from the available output voltage,
Because of this, it is recommended that the drop in each
load lead not exceed 1.0 volt. If a larger drop must be toler-
ated, please consult an HP Sales Engineer.
NOTE
Due to the voltage drop in the load leads, it may
be necessary to readjust the constant current
crossover limit setting in the remote sensing
mode.
340 REMOTE PROGRAMMING
- CAUTION
A programming device or programming resistors
must be connected to the appropriate rear term-
inals and the rear terminal strip cover must be
in place when the instrument is in use. Also, if
resistive ladder networks are utilized to program
the constant voltage/constant current outputs,
ensure that make-before-break switching is em-
ployed so that the BPS/A’s voltage and current
programming terminals are not momentarily
opened. If the programming terminals should
open, the output voltage/current will rise to a
value that might damage the load.
3-41 The constant voltage and constant current outputs
of the BPS/A can be programmed (controlled) from a re-
motely located device such as HP 6940A Muitiprogrammer
or HP 6941A Multiprogrammer Extenders. Either a resis-
tance or voltage source can be used as the programming de-
vice, The wires connecting the programming terminals on
the rear of the BPS/A to the remote programming device
should be twisted or shielded to reduce noise pickup.
342 Resistance Programming Constant Voltage, A
programming resistor (Rpy), connected as shown in Figure
3-6, can be used to control the voltage output or gain pro-
vided that the MODE switch is in the POWER SUPPLY or
the VARIABLE GAIN AMP position. Resistance program-
ming of the constant voltage output is not applicable in the
FXD GAIN AMP mode of operation. The VOLTAGE con-
troi on the front panel is disconnected (disabled) for the
strapping connections shown in Figure 3-6. To maintain the
stability and temperature coefficient of the instrument, use
programming resistors that have stable low noise and low
temperature characteristics (less than 20 ppm/?C.). Also,
they shouid operate at less than 1/30th of their wattage rat-
ing to minimize short term temperature effects.
36
A8 AS AIO fau АР АЗ Alá
21219122102)
Roy
Аб АЮ AIT AIS AIS A2C AZI
QQ edo
ESE he
(FOSITIVE)
DC
CONTROL 5
VOLTAGE +H : 3 Rec
CURRENT (NEGATIVE }
FLAG
X MUST BE (SOLATED FROM CONTROL GROUND
Figure 3-6. Remote Resistance Programming,
Constant Voitage/Constant Current
NOTE
Precision programming resistors (+ .05%) resistors
must be used.
3-43 Power Supply. For power supply operation, the
bipolar output voltage varies linearly from a maximum neg-
ative value through zero to a maximum positive value accord:
ing to the value of the programming resistance Rpy. The
voltage output ranges and correspanding values of Rpy
are as follows:
Rev 6825A
VALUE | HIGH LOW
RANGE | RANGE
0 -20.48v | —5.12V
10.24KQ | оу ov
[20.48K9 | +20.48V | +5.12V
3-44 As noted above, the output voltage should be zero
volts with 10.24K connected to the programming terminals.
The output may be adjusted to zero by adjusting the V
ZERO ADJ potentiometer as described in Paragraph 5-104.
The output voltage varies from the maximum negative value
to the maximum positive value through 0 at a rate deter-
mined by the resistance programming coefficient as follows:
High range (X4): 5000hms/volt + .1%
Low range (X1): 20000hms/volt + ‚1%
CAUTION
When remote control programming is employed,
the FLAG (A17) and REMOTE RANGE (A11)
programming connections must be isolated from
the computer ground.
3-45 The switch connected between the A11 and —S
terminals allows remote selection of the high (X4) or iow
{X1} range. Note that the front panel RANGE switch must
be in the REMOTE position in order to utilize the remote
selection feature. The remote de contro! voltage connect-
ions between terminals A15 and A16 activate an internal
relay. When the control voltage is applied, the interna! re-
lay is energized momentarily disabling the input driver to
the BPS/A error amplifier. This feature is used to prevent
transients from affecting the cutput when the programming
input is changed. Terminal A17 provides an indication to
the external programming device when the BPS/A is in con-
stant current operation.
3-46 Variable Gain Amplifier. For variable gain amplifier
operation, an externa! input signal (dc to 19kHz), applied to
terminals A1 (H! IN) and A2 (LO IN}, is amplified or atten
uated. The gain is variable from O to a maximum value as
the value of Rpy varies from 0 to 20.48K ohms. The variable
gain is from 0 to 8 in the high range and from 0 to 2 in the
low range.
CAUTION
The voltage applied to the input terminals, MH! IN
(A1) and LO IN (A2), must not exceed 50V
(maximum) or the instrument may be damaged.
3-47 Resistance Programming, Constant Current. Pro-
gramming resistors {Rp}, connected as shown in Figure
3-6, can be used to control the constant current output.
The front panel CURRENT contro! is disconnected (disabled)
when the remote Rpg resistors are connected as indicated.
Resistance programming of the constant current output
can be accomplished in afl three modes af operation (power
supply, variable gain amplifier, and fixed gain amplifier).
3-7
individual precision {+ 0.05%} Rp( resistors contro! positive
and negative constant current outputs respectively. The pos.
itive or negative output current is variable Нот О то 2.048A
at a rate determined by the programming coefficient as foi-
ows: 5 ohms/mA + 1%,
CAUTION
A load must be maintained at all times during
constant current operation. The load can bea
A0K resistor,
3-48 Zero output current for zero programming resis-
tance can be assured through proper adjustment of the front
pane! +t and —! ZERO ADJ potentiometers (see Paragraph
5.107}.
3-43 Voltage Programming, Constant Voltage. Voltage
programming of the output voltage can be accomplished in
the variable gain or fixed gain amplifier mode of operation,
Voltage programming is not applicable in the power supply
mode,
AS AS AID АН AIR АН Aia
(glplelelgigig
Rowe?
AIS AIG AIT AIG AtS AM AZ!
[eleJelelaigig
Figure 3-7. Remote Voltage Programming,
Constant Voltage
3.50 Variable Gain Amplifier. AC signals or a dc level
{positive or negative) can be amplified or attenuated in the
variable gain amplifier mode. Figure 3-7 shows a variable
dc level (programming voltage) applied to the input termin-
als AT (HI IN) and A2 (LO IN). Since the BPS/A is non-
inverting in the variable gain amplifier mode, a positive input
(A? positive, A? negative) results in a positive output anda
negative input {A1 negative, A2 positive) results in a nega-
tive output. The other connections on Figure 3-7 are shown
for iocal control using front pane! controls, however, remote
contro! using external controís may also be employed. The
front panel or remote voltage controls can be used to atten-
uate or amplify the input as required. With the front panel
VOLTAGE contro! or remote programming resistor set for
maximum output, the programming coefficient is as follows:
High Range (X4): 8 volts/volt + .1%
Low Range (X1): 2 volts/volt + .1%
3-51 Fixed Gain Amplifier. AC signals up to 40kHz or
a dc level (positive or negative} can be amplified in the fixed
gain amplifier mode, Figure 3-7 shows a variable de level
(programming voltage) applied to the HI (A1) and LO (A2)
input terminals, Since the BPS/A provides an inverted out-
put in the fixed gain amplifier mode, a positive input (A1
positive, AZ negative) results in a negative output and a neg
ative input (A1 negative, A? positive) results in a positive
output. The front panel or remote programming voltage
controls are not applicable in this mode. The programming
coefficient in the fixed gain amplifier mode is as follows:
High Range (X4): 4 volts/volt + .1%
Low Range (X1): 1 voit/voit + .1%
Al AZ + -S 45 +
12121191210
=
Ад
Y Y
Ry
AB AS AIO All Al2 AB Aja
lalplelele[ele
AS AE AIT АВ АЮ ARO AZ
e 0/09 006
to"
A
И
* THESE SUPPLIES MUST BE ISOLATED
FROM POWER GROUND.
Figure 3-8, Remote Voltage Programming,
Constant Current
E Зоо ПОДИ
A2 BOARD
#
“e
ciedad в
a
TY
LOCAL /AUTO SWITCH
AUTO POSITION ag» LOCAL POSITION
{TOWARD FRONT) (TOWARD REAR)
Figure 3-9, Local/Auto Switch
3-8
3-52 Voltage Programming, Constant Current. Voltage
programming of the output current can be accomplished in
all three operating modes {power supply, variable gain am-
plifier, and fixed gain amplifier). Positive and negative dc
programming voltages are connected to terminals A14 and
A21 respectively as shown in Figure 3-8. The positive or
negative output current will vary linearly with changes in
the programming voltages. The output current varies at a
rate determined by the programming coefficient. The pro-
gramming coefficient is 2 amps/! volt. The maximum rated
output current is ZA, therefore, the maximum programming
voltage is 1 volt.
3-53 SERIES AND PARALLEL CONNECTIONS
3-54 The following paragraphs describe the connections
required for combining BPS/A's for series and parallel oper-
ations. These connections are employed whenever it is re-
quired to extend the voltage/gain or current capability be-
vond one supply. For series operation, the total output
voltage/gain is the sum of the voltages/gains of the individ-
ual supplies. For parallel operation, the tota! output current
is the sum of the output current from the individual supplies.
For series or parallel operation, the BPS/A's must be opera-
ted in the same mode {power supply, variable gain amplifier,
or fixed gain amplifier}. Also, each supply must have its
Auto/Local switch A251 {see Figure 3-8) in the Local posi-
tion {pushed toward the rear of the instrument). Note that
the external signal applied to the At and AZ terminals is in-
ternally disconnected when the BPS/A's are in the power
supply mode.
255 Series Connections. Two or more supplies may be
connected in series to obtain a higher voltage/gain than is
available Yom a single supply. Figure 3-10 illustrates the
series connections for three supplies. Each of the supplies
must be adjusted in order to obtain the desired output/
voitage gain.
3-56 Paraliei Connections. Parallel operation of BPS/A
is possible because of the constant voltage/constant current
crossover feature. Two or more power supplies can be con-
nected in parallel to obtain a total output current greater
than that available from one power supply. The total output
current is the sum of the output currents of the individual
power supplies. The load must be selected so that the current
limit of one supply is exceeded allowing it to operate in the
constant current mode. The output CURRENT controls of
each power supply can be separately set. The output voltage
controls of one power supply should be set to the desired
output voltage; the other power supply should be set for a
slightly larger output voitage. The supply set to the lower
output voltage will act as a constant voltage source; the
supply set to the higher output will act as a constant current
source, dropping its output voltage until it equals that of the
3-9
Al AZ + -$ ~f +5 +
di
АВ АЯ АЮ АН АВ АВ А!4
QA
AIS AIS AT AIB AIS AZO AZ:
BEEEAMAR
и”
A! AZ — -5 [ЗЕ +
ВР5/А
NO. 2 АВ АЯ АЮ А! АР АБ АН
AIS AIG AIT AIB ATS А2О АЗ |
BEEEERR
RL
NV
Al AZ # -5 =- +
©
+5
BPS/A
NO. 3 A8 A9 MO AI! AlZ AI AM
]lglel2igizlel
A1S AIG AIT AIS AIS AZOAZI
BECA
“а
NOTES:
1, ALL THREE UNITS MUST BE OPERATED IN THE
SAME MODE.
2. UNITS 2 AND 3 MUST BE FLOATED (NOT
CONNECTED TO CHASSIS 2
Figure 3-10. Series Connections
other supply. The constant voltage source will deliver only
that fraction of its total rated output current which is necess-
ary to fulfil! the total current demand. Figure 3-11 illustrates
the parallel connections for three units.
и
BP S/A
NC t
В
NO. 2
>
BPS/A
NG. 3
NOTES.
Al AZ + -S — +8 +
Plale|@|
Lo °
48 AS AO Ail AIZ AIS АМ
@ipiele gigi
AS ANS AI? AIR AI9 AZDAZ
AS AS AJO All Al2 AN Aid
PSA
AIS AIS AT AB AIG AZDAZI
300000
the master supply. For auto-paraliel operation, compiete
control of the output current from one master is allowed.
Diagrams are included for the strapping connections re-
quired between master and slaves for both auto-series and
auto-paraliei operations. in either case, the master must be
in the power suppiy or variable gain amplifier mode and the
staves must be in the fixed gain amplifier mode. Also, for
auto-series or parallel operation, the master supply 's Local/
Auto switch A251 {see Figure 3-9) must be in the Local pos-
ition and each siave supply must have its Local/Auto switch
tn the Auto position, The diagrams show the master strapped
for local programming and with an external signal applied to
the amplifier input terminals. However, the same auto-series
or auto-paraliel connections could be used with the master
strapped for remote programming. Also, with the master
supply In the power supply mode, the external signal applied
to the Al and AZ terminals is internally disconnected.
oleje|e|giele
Al AZ + -5 fs +
© |
AB AD AID All AIZ AIS Ai4
i. ALL THREE
SAME MODE
2. UNITS 2 AND 3 MUST BE FLOATED (NOT
CONNECTED TO CHASSIS +.
QD
AS ARIE AIT A AIO A20 A2
9/0 /0/0/0/910)
— ана
UNITS MUST 8E OPERATED IN THE
Figure 3-11. Parallel Connections
3-57 AUTO-SERIES AND AUTO-PARALLEL
CONNECTIONS
358 The following paragraphs describe the connections
required for combining BPS/A's in auto-series and auto-
parallel, These connections are employed whenever it is re-
‘quired to extend the voltage/gain or current capability be-
yond one supply. For auto-series operation, the output volt-
age of each slave supply varies in accordance with that of
Al AZ de -5 \- +5 +
i T
| | MASTER
© | (POWER SUPPLY OR
VARIABLE GAIN
AMPLIFIER MODE.
LOCAL /ALITO SWITCH
ik LOCAL)
AB AY AIC AU AIS AIS Al4 TT
1 Ë i
оо еее
7 Yd Td
AB AG AIT AIS AID AZ0 AZ!
i 7 F Ki | |
12121212 |Ф.Ф 9
wa wo
SR, Sn:
$3 Al AZ Ww -§ [45 4
| | SLAVE #
Pe {FIXED GAIN AMPL
MODE, LOCAL/AUTO
SWITCH IN AUTO)
92
AB AS AIO Al AI? AM AJA
> Ro
> AIS AIG AI7 AIS AIS AZO ASI
1 22229)
>
j
AT AZ + -8 —f +5 \+
POSI O) Fixes can mn
— À =r u MODE, LOCAL /AUTO
SWITCH IN AUTO)
41912121919.
AIS A6 AIT AB AIS A20 42)
eje 0/0/00 el
Lou
Figure 3-12. Auto-Series Connections, Three Units
3-59 Auto-Series Operation. Two or more BPS/A's can
be connected in an auto-series arrangement to obtain a high-
er output voltage than that available from a single supply.
Figure 3-12 illustrates the auto-series connections for three
suppties. When this arrangement is used, the output voltage
of each siave supply varies in accordance with that of the
master supply; thus, the total output voltage of the combin-
ation is determined by the master suppiy's front panel
VOLTAGE contro! (or remote programming input). The
front panel CURRENT controls (or remote programming
inputs) of all three units are operative and the current limit
is equal to the lowest setting. The slave units must be floated
off ground. Instruments can be operated fioating up to
300 volts off ground whether operated singlely or in series.
3-60 For instantaneous egual voltage sharing, resistors
R1, Ro, or R3 must be equal. Since any variation in Ry,
Ro, or Ra will result in a change in the voltage divider.ratio -
and hence the output of the slave supply, it is important
that these resistors be stable, low temperature coefficient
(20 ppm/? C or better). Also, they should have power rating
of at least 10X, their actual power dissipation. The resis-
tors shouid be selected at the normal operating voltage
levels so that the current through them is about 1 to 2mA.
3-61 Auto-Parallel Operation. Two or more BPS/A's
can be connected in auto-paratle! arrangement to obtain an
output current greater than that available from a single sup-
ply. Figure 3-13 illustrates the auto-parallel connections
for three supplies to allow increased output current in con-
stant voltage operation. When this arrangement is used,
current sharing under all load conditions is permitted under
control {front panel CURRENT control or remote program-
ming) of the master supply. Because the CURRENT con-
trols (or remote programming) of each slave are operative,
they should be set to a maximum to prevent the slave re-
verting to constant current operation; this could occur if
the master output current setting exceeded the slave's. For
equal current sharing, the leads from RM to the ioad and
to the (—) terminals should be approximately equal in length.
To maintain instrument accuracy and stability, RM should
be a stable, iow temperature coefficient resistor of sufficient
rating to prevent any appreciable self-heating (typically 182,
8W, +20 ppm/°C, £1%).
3-62 BIPOLAR OVERVOLTAGE AND OVERCURRENT
LIMIT
3-63 — Bipolar overvoltage and overcurrent limit circuits
prevent excessive BPS/A voltage or current outputs. The
voltage limiting circuit prevents the output voltage from ex-
ceeding approximately + 22 volts. The current limiting cir-
cuit limits the transient output current 10 a value approxi
mately two times the maximum rated output of 2.0A.
3-11
Al AZ dr \=5 = +5 +
MASTER
{POWER SUPPLY OR
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MODE , LOCAL / AUTO
SWITCH IN LOCAL)
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SLAVE 1
{FIXED GAIN AMPL
MODE, LOCAL/AUTO
SWITCH iN AUTO)
SLAVE 2
(FIXEC GAIN AMPL.
MODE , LOCAL/AUTO
SWITCH tN AUTO!
"Y Y
AB A9 AIC ALL AIR AID AN
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2122219819
Figure 3-13, Auto-Paraliel Connections, Three Units
3-64 REVERSE VOLTAGE AND CURRENT LOADING
3-65 Current limit circuits also protect the BPS/A from
active loads that force energy in or out of the BPS/A {sink
condition). This can appear as current flow into the HI
QUT (+) terminal when the terminal is positive, or current
flow out of the terminal when it is negative, Figure 3-14
shows the normal operating locus of the BPS/A. As shown,
the 6825A BPS/A will limit the sink current to a value
ranging linearly from 2A at OV to 1A at 20V.
3-66 An active icad can easily be accommodated by the
BPS/A as tong as the following precautions are adhered to:
a. The active load must not be applied unless the BPS/A
is in its active state.
b. Program to zero output before disconnecting load.
- - CAUTION
Externally applied voltage to output terminals
in excess of 25V could damage the instrument.
3-12
+ Y
+20v
ЗАК SOURCE
1 -24 +2al _
5 Th
SOURCE SEA
= 20V
-¥
Figure 3-14. 6825A Output Ranges
SECTION IV
PRINCIPLES OF OPERATION
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MOTES:
jm DENOTES VOLTAGE FEEDBACK
2. — DENOTES CURRENT FEEDBACK
3. FRONT PAMEL VOLTAGE CONTROL OR REMOTE PROGRAMMING (RESISTANCE!
4 FRON? PANEL CURRENT CONTROL OR REMOTE PROGRAMMING (RESISTANCE OR VOLTABE:
Figure 4-1. BPS/A Block Diagram
41 OVERALL DESCRIPTION
4-2 GENERAL
4-3 The following paragraphs provide an overall
description of Bipolar Power Supply/Amplifier, Model
6B25A. The BPS/A can be operated as a power supply or a
power amplifier. As a power supply, the BPS/A provides a
precise low noise, low drift bipolar output voltage. - The out-
put voltage can be varied from positive to negative continu-
ously through zero using the front panel VOLTAGE contro!
or a remote programming control. A crossover feature auto-
matically changes the supply mode from constant voltage to
constant current. Constant voltage (CV )/constant current
{CC) operation is described in Paragraph 4-15. The BPS/A
is also capable of sinking current; that is, current from an
active load can flow back into the BPS/A when the output
terminal is positive or current can flow out of the output ter-
mina! when the voltage is negative. The BPS/A can sink cur-
rent up to 50% of the rated current output. The BPS/A can
4-1
also function as a variable gain or fixed gain amplifier to am-
plify externally applied dc and ac signals. The variable gain
can be controlled locally (front panel VOLTAGE control)
Or remotely and is accurate to within 0.1%. The variable
gain amplifier is non-mverting and has a frequency response
from dc to 15кНг. Total harmonic distortion is Jess than
0.1%. The fixed gain amplifier is inverting and has a fre-
quency response from de to 35kHz,
4-4 BLOCK DIAGRAM DESCRIPTION
4-5 Figure 4-1 is a basic block diagram of the BPS/A
showing the major circuit blocks, together with the principle
input/output signals of each block. The sheet numbers
correlate the blocks shown on this diagram with the schem-
atic sheets at the rear of the manual.
4-6 The ac line voltage is applied to the power transfor-
mer and, after being altered in level, is rectified and filtered.
The resulting raw de of both polarities is fed to the series
regulator/output amplifier, which varies its conduction {pos-
itive or negative) in response to feedback signals to provide
the proper output voltage or current. During power supply
operation, this circuit functions as a series regulator to pro-
vide the proper output voitage. During amplifier operation
it acts as an output amplifier to provide the proper gain for
externally applied ac or dc signals. The MODE switch
allows selection of the power supply mode or amplifier
mode {fixed or variable gain}. The series regulator/output
amplifier is part of a feedback loop consisting of the ampli-
fier and driver circuits, and the voltage and current compar -
ison amplifier circuits.
4-7 The amplifier and driver circuits receive an error |
signal from the voltage or current comparison amplifiers
in order to control the conduction of the series reguiator/
output amplifier transistors. A positive or negative going
error signal is amplified by the appropriate amplifier and
driver transistors (positive or negative) and then fed back
to control the appropriate series regulator/output amplifier
transistors.
4.8 During constant voltage operation, the voltage com-
parison amplifier compares a portion of the output voltage
(feedback) with a reference voltage. In the power supply or
variable gain ampiifier mode, the reference voltage is re-
ceived from the reference/gain control circuit. In the fixed
gain amplifier mode, the reference voltage is an externally
applied ac or de signal. If the feedback and reference volt-
ages are not equal, the voltage comparison amplifier pro-
duces an amplified error signal which is further amplified by
the tow level amplifier and driver circuits and then fed
to the series regulator/output amplifier to contro! the out-
put. in this manner, the voltage comparison amplifier main-
4-2
tains a constant output voltage and also generates the signal
necessary to set the output level according to the reference
voltage or the externally applied ac or dc signal, Note that
the output voltage feedback signal is applied to the voltage
comparison amplifier via a range control circuit. This circuit
provides the proper scaling of the output in the high and
low output ranges,
4-9 in the power supply mode, the voltage comparison
amplifier and output amplifier (amplifiers, drivers, and series
regulator} blocks can be viewed as a power operational am-
plitier whose inputs consist of the feedback signal and a
control signal from the reference/gain control circuit block.
The control signal is derived from an internal de reference
voltage which is applied to the reference/gain contro! circuit
via the MODE selection switch. As the result of a summing
action, a bipolar output can be obtained whose magnitude
and polarity depend only upon the setting of the VOLTAGE
control {or remote programming resistance) connected
across the reference/gain control circuit (refer to Paragraph
4-43 for a detailed description of this circuit). In the vari-
able gain amplifier mode, an external de or ac signal is
applied to the reference/gain control circuit via the MODE
switch. For variable gain amplifier operation, the magnitude
of the output depends upon the setting of the VOLTAGE
contro! (or remote programming resistance) and the polarity
of the output is the same polarity as the input signal. In the
fixed gain amplifier mode, an external ac or de signal is ap-
plied to the voltage comparison amplifier via the MODE
switch {the reference/gain contro! circuit is bypassed). For
fixed gain amplifier operation, the output signal is inverted.
The range control circuit in the voltage feedback path aliows
high or low range scaling of the output in all three modes
of operation. The range control circuit may be controlled
locaity {front panel RANGE control) or remotely {rear
terminal strip). The range control circuit is described in
detail in Paragraph 4-47,
4-10 The current comparison amplifiers control the
switching of BPS/A operation between constant voltage
and constant current {see Paragraph 4-15) and provide a
constant current output when the BPS/A is operating as a
constant current source. During constant current operation,
positive and negative current comparison amplifiers detect
any difference between the voltage drop across the current
sampling resistor and a fixed stable reference. The voltage
across the sampling resistor is applied to the amplifiers
through the front panel CURRENT contro! or remote cur-
rent programming centrol. Any change in load current
whether by variation of the CURRENT contrat resistance
(or remote current programming input) or by changes in the
current through the current sampling resistor causes an
error voltage proportional to the current to be applied
to the amplifier and driver circuit.
Consequently, the series regulator/output amplifier conduc.
tion will be altered thereby restoring the load current to
some initial value. Either the positive or the negative current
comparison amplifier can be in control depending upon the
polarity of the current.
4-11 The bipolar overvoltage and current limiting circuits
monitor the output voltage and current, The voltage limiting
circuit prevents the output voitage from exceeding approxi
mately 10% of the maximum rated output voltage. The
current limiting circuit Himits the output current to a value
approximately two times the nominal rated output in order
to protect the instrument during the transition from con-
stant voltage to constant current operacion.
4-12 The turn-on/off circuit protects the load from
power turn-on and turn-off transients by shorting the BPS/A
output and disabling the amplifier and driver circuits during
turn-on and turn-off.
4-13 The bias supply converts the ac input to regulated
dc voltages which are used throughout the instrument for
biasing purposes. Also, the reference voltages used in the
voltage and current comparison circuits are derived from the
bias voltage. In addition, the bias supply provides the voit.
age to operate the turn-on/off circuit.
4-14 Meter circuits are provided for monitoring the
BPS/A output voltage and current (ac and del. Compensa-
tion circuits are included for meter loading effects.
4-15 CONSTANT VOL TAGE/CONSTANT CURRENT
OPERATION
4-16 In order to maintain a constant voltage output, the
voltage comparison amplifier tends to achieve zero output
impedance by altering the output current whenever the load
resistance changes. in order to maintain a constant output
current, the current comparison amplifiers attempt to
achieve infinite output impedance by changing the output
voltage in response to any load resistance variations. Thus,
it shouid be noted that the voltage and current comparison
amplifiers cannot operate simultaneously. For any given
value of load resistance, the BPS/A must act either as a con-
stant voltage or a constant current supply. Transfer between
operation is accomplished automatically by switchable de-
coupling circuits at a value of load resistance equal to the
ratio of the output voltage control (VOLTAGE control or
remote voltage programming contro!) setting and the cur-
rent control (CURRENT control or remote current program
ming contro!) setting. Figure 4-2 shows the output charac-
teristics of a constant voitage/constant current power sup-
piy when operated within the bipolar output voltage and
current ranges. With no load attached (Ry ==), loyy = 0,
and EQUT = ES, the front panel voltage or remote program-
ming contro! setting. When a load resistance is applied to
the output terminals of the power supply, the output current
increases, while the output voltage remains constant; point
D thus represents a typical constant voltage operating point.
Further decreases in load resistance are accompanied by
further increases in {QUT with no change in the output voit,
age until the output current reaches ig, a value equal to the
front panel current Or remote programming control setting.
At this point the supply automatically changes its mode of
operation and becomes a constant current source; still fur-
ther decreases in the value of load resistance are accompan-
ied by a drop in the supply output voltage with no accom-
panying change in the output current value. With a short
circuit across the output load terminals, iQyT = 18 and
EOUT = D.
CONSTANT
OPEN VOLTAGE
CIRCUIT OPERATING
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Eo «FRONT PANEL VOLTAGE CONTROL SETTING OR
REMOTE PAOCGRAMENND SETTING.
bee FRONT PANEL CURRENT CONTROL SETTING OR
REMOTE PROGRAMMING SETTING
E
Res vo “CRITICAL” OR “CROSSOVER” VALUE OF
3 LOAD RESISTOR
Figure 4-2. CV/CC Operating Locus
4-17 Thus, at voltage and current settings within the bi-
polar ranges, the “crossover” value of load resistance can be
defined as Вс = Es/15. Adjustment of the voltage and cur-
rent settings permits this “crossover” resistance Re to be
set to any desired value within the rating of the instrument.
If the magnitude of Ry is greater than Rc, the supply is in
constant voltage operation.
4-18 DETAILED CIRCUIT DESCRIPTIONS
4-19 GENERAL
4.20 The following paragraphs provide detailed circuit
descriptions of BPS/A Model 6825A. The descriptions are
based on simplified schematic of Figure 7-1, and the detailed
schematic of Figure 7-2 (Sheets 1 and 2). The simplified
schematic illustrates, in simplified form, the circuitry depic-
ted on Sheets 1 and 2 of Figure 7-2. The sheet numbers on
Figure 7-1 correlate the simplified circuits with the circuits
on the detailed schematic. The simplified schematic is pro-
vided for ease of understanding and should be referred to in
conjunction with the detailed schematic. Sheet 1 of Figure
7-2 illustrates the output power amplifier and input power
circuits, and Sheet 2 illustrates the voltage and current con-
troi circuits.
OUTPUT POWER AMPLIFIER CIRCUITS
{Figure 7-2, Sheet 1)
4-21
4-22 AC input. AC input power is applied to the chassis
mounted power transformer T1 via the power module on
the rear of the unit and the LINE ON switch $1 on the front
panel. The power module contains fuse F1 (1A for 115Vac
or BA for 230Vac input power) and a slide switch for con-
necting 115 or 230Vac to the primary of the power trans-
former. The power transformer secondary provides the
proper magnitude ac inputs to the rectifier-filter and to the
bias supply. )
4.23 Rectifier-Filter. The rectifier-filter circuits, con-
tained on the interconnect and power supply board A1,
provide the main dc power cutputs. These circuits consist
of rectifier diodes arranged in full-wave center-tapped recti-
fier configurations with associated filter capacitors and
bleeder resistors to provide + 35 and + 45 volt raw de outputs.
The front panel LINE ON indicator DS1 is connected across
the +35 voit output to indicate when the BPS/A is turned
on. The + 35 volt outputs are the main input lines to the
series regulator/output amplifier. The + 45 volt outputs are
the bias supply voitages for the amplifier and driver circuits
on board АЗ.
4-24 Bias Suppiy. The bias supply circuit provides stable
£156 volt outputs which are used throughout the instrument
for biasing purposes and to develop the reference voltages.
The bias supply also provides 20 volt {filtered and unfiltered)
auxiliary outputs. Two series regulator type circuits main-
tain the £15 volt outputs constant. Since the circuits are
identical, only the +15 volt circuit is discussed. Transistor
A102 is a voltage comparison circuit that compares the +15
volt output with a fixed reference voltage. The +15 volt
4-4
output is applied to the base circuit of A102 through resis-
tors ATR29 and A1R30, whereas the reference voltage is
— furnished in the emitter circuit by ATVR1. If the +15 volt
output changes, voltage comparator A1Q2 produces an error
signal which is applied to the base of series regulator A1Q1.
The error signal causes A101 to change its conduction so as
to correct the output voltage,
4-25 — Series Regulator/Output Amplifier, NPN power
transistors Q1 through 04, mounted on the heat sink assem-
bly, are utilized as series regulators during power supply op-
eration and as a single ended push-pull amplifier during am-
plifier operation.
4-26 During power supply operation, paraliel connected
transistors Q1, Q2, and Q3, Q4 serve as series control ele-.
ments in the positive and negative output lines, respectively.
The series regulators are controlled by the positive and neg-
ative driver circuits on board A3. When the positive driver -
circuits are in control, the series regulators Q1 and Q2 are
conducting and the series regulators Q3 and Q4 are turned
off. For this condition, the supply furnishes a positive out-
put. The reverse is true when the negative driver circuits
are in control; Q3 and O4 are turned on, Q? and Q2 are
turned off, and the supply provides a negative output.
4-27 Note that NPN power transistors 01 and Q2 and
associated NPN driver transistors A3Q12 and A3Q14 through
A3Q16 are connected as cascaded emitter followers which
respond to a positive going signal. in order to respond to
negative going signals, NPN power transistors Q2 and Q3 are
connected with PNP driver transistors A3Q13 and A3Q17
through A3Q19 in a pseudo-PNP configuration using local
feedback. This configuration allows NPN power transistors
to be employed as series control elements for negative out-
puts. |
4-28 During amplifier operation, the transistors serve as
a single-ended, push-pull output amplifier. Although the
schematic shows Q1, Q2 and 03, 04 drawn as a convention-
al series regulator, the circuit could be redrawn as a push-
pull amplifier without changing any of the connections.
The output amplifiers are biased for class AB operation and
are connected in a complementary configuration.
4.28 Coupling Amplifier and Driver Circuits. The coupling
amplifier and driver circuits on board A3 amplify the error
signal received from the voltage and current control circuits
on board A2. This amplified signal controls the conduction of
the series regulator/output amplifier transistors, thus control-
ting the amplitude and polarity of the BPS/A output. The am-
plitier and driver circuits consist of positive amplifier and
driver stages (Q6-Q8, (12, 014-016), and negative amplifier
and driver stages (09-011, 013, 017-019) on board A3.
4-30 Theerror signal from the voltage or current control -
circuits is applied to the positive and negative voltage contro!
amplifier eircuits on board A3. For a positive going control
signal the positive amplifier conducts more and the negative
amplifier less. The reverse is true for a negative going control
signal. Since the positive and negative sections of the ampli-
tier and driver are symmetrical, only the positive section is
discussed in detail. |
4-31 The positive voltage coupling amplifier 18 comprised
of transistor stages 06, Q7 and Q8. Coupling amplifier stage
Q7 serves as a “level changihg”™ transistor coupling the error
signal to the output driver circuits. The gain of the coupling
amplifier is about 1.6X. Notice that the supply voltages for
the input circuits are lów level and referenced to [2]: com-
mon (see Figure 7-2, sheet 2}. The other amplifier and driver
stages, however, use high-level supply voltages {+ 35 and
+ 45V) that are referenced to common. Transistor
Q8, in the emitter circuit of coupling amplifier Q7, serves to
minimize unwanted ground current from flowing in the low
output sense terminal. The negative going output of coup-
ting amplifier stage Q7 is applied to voltage amplifier Q6. The
positive (05-08) and negative (09-011) coupling amplifiers
provide a combined gain of approximately 36X. Each section
(positive and negative) provides a gain of approximately 18X,
As a result of the voltage amplification, the voltage across R28
biases the positive (NPN) driver transistors (012, 014
through 016) into conduction provided that a turn-on con-
dition is present (see Paragraph 4-35). The positive driver
transistors drive the positive series regulator/output ampti-
fier transistors Q1 and Q2. These transistors are connected
in series with the +35V supply voltage and thus control the
BPS/A output. Capacitors C9, C10 and resistor R27 form
networks which in addition to capacitor C11 connected be-
tween the HI and LO output terminals help to shape and
stabilize the BPS/A output response. Additional local stabil-
ization is afforded by network {C14, R53) in the positive
driver circuits, and network {C15, R55) in the negative
driver circuit.
4.32 The negative section of the power amplifier operates
in the same manner as that described above except that it is
activated by negative going error signals and provides negative
BPS/A outputs. The negative section is comprised of nega-
tive voltage coupling amplifier stages (09-Q11), and negative
{PNP) driver transistors {Q13, Q17 through Q18).
4-33 Atzero output voltage, both the positive and nega-
tive driver sections are conducting a small current through
diodes CR14, CR15; and CR 186 to provide the voltage drop
necessary to forward bias Q12 and Q13 simultaneously.
This eliminates “dead spots” when the BPS/A is programmed
through zero.
4-5
4-34 Bipolar Overvoltage and Current Limiting Circuits.
The bipolar overvoltage and current limiting circuits are
located on board Ad. Zener diodes VR1 and VR2, connec-
ted, in the base circuits of Q12 and 13, prevent the output
voltage from exceeding approximately +22 volts. Diodes
CR20, CR21, and CR22 form current limiting circuits,
These diodes monitor the output current flowing through
the series ragulator/output amplifier and limit the transient
current to a value approximately 2 times the nominal rated
output during the transition from the constant voltage to
constant current operation,
4-35 Turn On/Off Circuit. The turn on/off circuit is
comprised of transistor stages QT through Q5 on board АЗ.
and relay K1 on board A1. The purpose of this circuit is to
limit turn on/off transients which might affect the load. To
accomplish this, the output is clamped at a low level when
the BPS/A is turned on or off.
4-36 Before power is applied to the BPS/A, relay A1K1
is deenergized connecting the Hi OUT (+) to LO OUT {+}
tine via 2) common through resistor R60 (12, 3W).
Also, with A1K 1 deenergized, an open circuit is present at
the emitter of A3Q1. When power is applied, relay ATK1
will not become energized for approximately 0.2 seconds
due to RC time constant (R32, R37, C2). Thus, the open
circuit condition is present at the emitter of A3Q1 at initial
turn-on. The +20V {unfiltered} supply voltage, however,
causes transistors A304 and A305 to be forward biased.
Consequently, transistors A302 and A3Q3 are turned on
drawing current away from the bases of driver transistors
A3012 and A3Q13 respectively, effectively turning these
stages off. After the delay {approximately 0.2 seconds} has
elapsed, relay ATK1 becomes energized removing the (2
common path to the HI OUT terminal and connecting @
common to the emitter of A3Q1 causing the collector of
A301 to drop to about 0.1V. For this condition, the for-
ward bias for transistor A3Q4 is removed causing A3Q4 to
turn off which in turn causes transistors A302 and A3Q3
to turn off removing the clamping action at thé bases of
A3Q12 and A3Q13. Driver transistor A3Q12 or A3Q13
will now conduct depending upon the magnitude and polar-
ity of the error signal,
4-37 At turn-off, the +20V {unfiltered} suppiy voltage
is removed but relay A1K1 remains energized for approxi-
mately .1 seconds due to stored energy. When it becomes
deenergized, the (2) common connection from the em-
itter of A3Q1 is removed and the HI QUT line is connected
to the LO OUT line via R60. However, the +20V (filtered)
supply voltage is present for some time causing A304 and
AJOS to be forward biased. This drives transistors A302
and A3Q3 into full conduction drawing current away from
the bases of A3Q12 and A3Q13 respectively, effectively
turning these stages off during the decay of stored voltages.
4.38 Meter Circuits. The meter circuits provide contin-
uous indications of output voltage and current. VOLTAGE-
METER M1 is connected across the BPS/A output and can
be used to monitor ac or de output voltage depending upon
the position of switch A1S1. With A1S1 in the AC position,
diode A1CR20 rectifies the ac output voltage in order to
obtain an rms reading. Variable resistors A1R8 (de adjust)
and A1R13 (ac adjust) are used when calibrating the volt-
meter. CURRENT-METER M2 is connected across the cur-
rent sampling resistor A2R27 whose voltage drop is propor-
tional to the output current. Meter M2 can measure ac or
dc output current depending upon the position of switch
A152. With A1S2 in the ac position, current meter driver
AZUS and diode CR18 amplify and rectify the ac input
{applied through C13) in order to obtain an rms reading.
Variable resistors A1R20 (dc adjust) and ATR 18 {ac adjust}
are used when calibrating the ammeter.
4-39 Each meter switch provides two ranges, with a
10:1 ratio for each of the dc and ac functions. Resistor
R54 is a thermistor which in conjunction with R55 com-
pensates for temperature effects.
4-40 VOLTAGE AND CURRENT CONTROL
CIRCUITS (Figure 7-2, Sheet 2)
441 The voltage control circuits consist of the mode
selection, voltage reference/gain control, and voltage com-
parison circuits. The current control circuits consist of
positive and negative current comparison circuits. Each of
these main circuits and associated components are described
in the following paragraphs.
4-42 Mode Selection. The front panel MODE switch
{sections ASS2A and ABS28) allows the selection of the
power supply, variable gain amplifier, or fixed gain amplif-
ier operating mode. in the power supply mode, a positive
dc reference voltage is converted to a variable bipolar de
output voltage by operational amplifier techniques. In
the variable gain amplifier mode, an externally applied de
or ac signal is attenuated or amplified by the voltage refer-
ence/gain control circuit for application to the voltage com-
parison amplifier. In the fixed gain amplifier mode, the
voltage reference/gain control circuit is bypassed and an ех-
ternatly applied dc or ac signal is applied directly to the
voltage comparison amplifier. Each of the above conditions
is described in subsequent paragraphs.
4-43 Voltage Reference/Gain Control Circuit. In the
power supply mode, voltage reference/gain control amplifier
A2U2 provides a signal {0 to —10V) at the junction of
A2R6 and A2R7 depending upon the setting of the front
pane! VOLTAGE contro! ABR2 {or remote programming
input). With rear terminals AB and AS shorted and Al)
open, local contro! is allowed through ABR2. Remote con-
4-6
trol is allowed by connecting a programming resistance be-
tween AD and A10 with AB open,
4.44 A fixed +5.12V reference voltage, derived from
the +15V regulated bias supply, zener diode A2VR4, and
resistors A2R58, A2R59, is applied to the inverting input
(pin 2) of A2U2 through section SZA of the MODE switch
and A1R42 and A2R4. Depending upon the front panel
VOLTAGE control (A5R2) setting (or remote programming
input}, A2U2 provides a 0 to —10V output. This output is
summed at the junction of AZR6 and AZR7 with the
+5.12V reference which is applied through section S2B of
the MODE switch. This summing action provides a variable
bipolar voltage output.
4-45 In the variable gain amplifier mode, the +5.12V refer-
ence is removed and an external signal {dc or ac}, applied to
the HI IN (A1} and LO IN (A2) terminals, is fed to the invert-
ing input of A2U2. For this mode, the VOLTAGE control
ASR2 (or remote programming input) controls the gain of
A2U2 from O to 2X and summing with the de references
is not performed.
4-46 Diodes AZCR1 and A2CR2 limit the maximum
input to the A2U2 amplifier protecting it from excessive
voltage excursions. Variable resistors ATR1 (V ZERO on
front panel), A2RE8 (course adjustment), and A2R59
(fine adjustment) in the reference voltage circuits are used
to calibrate zero output voltage and the reference voltages.
4-47 Voitage Comparison Amplifier. Voitage compari-
son amplifier A2U1 continuously compares the output voit-
age with a reference voltage. The inverting input (pin 2) of
A2U1 is the summing point which receives a portion of the
output voltage {feedback voltage) from the (+5) terminal
and the variable reference voltage from A2U2 or from the
Hi and LO IN terminals (AT and A2}). The non-inverting
input {pin 3} of A2U1 receives a fixed dc bias. If a differ-
ence exists between these inputs, the comparison amplifier
produces an “error” voltage at pin 6 whose amplitude is
proportional to the difference. The error signal is then app!
to the series regulator/output amplifier via the coupling arr
plifier and driver circuits, The feedback voltage is applied
to the summing point {pin 2 of A2U1} from the high sense
terminal (+S) via a range network consisting of resistors A
A2R16, A2R42 and relay A2K3. Relay A2K3 changes
the range of the power amplifier by changing the feed-
back resistance by a factor of 4. in the X4 range, resistor
A2RS, A2R16, and A2R42 are in the feedback path. 1n 1
X 1 range resistors, A2R9 and A2R42 are shorted out. Re
A2K2 switches in the proper value equalizing network fo:
each range; À2C7 and A2R14 in the X4 range or these
components in parallel with C6 and R15 in the X1 range.
Relays AZK2 and A2K3 are controlled by the RANGE
switch A5S2C {positions X1, X4, or REMOTE). In the
X4 position, the junction of A2K2, K3, and CR4 anode is
removed from 2) return which disables the relays to
their normally open condition, However, with ABS2C in
the X1 position, the return to [2) is completed and the
relays are activated from the +15Vdc bias supply. With
RANGE switch ABS2C in the REMOTE position, remote
selection of the X1 or X4 range is allowed via rear terminal
All,
4-48 Changes in the error signal magnitude and polarity
instantaneously cause the summing point potential to change.
This change causes comparison amplifier A2U1 to provide
the proper correction voltage to the low level amplifier and
driver cireuits. The correction voltage levels at the low level
amplifier input are from approximately --2.5V to -4.5V
and correspond to the output voltage range of +30V to
.20V. A correction voltage of approximately —3.5V corres-
ponds to an output voltage of OV. Zener diode AZVRB,
diodes A2CR20, and CR21, and resistor A2R41 prevent
A2U1 trom going deep into saturation. Diodes A2CR18
and A2CR19 limit the maximum input to the comparison
amplifier thus protecting it from overvoitage conditions.
Variable resistors A2RB0 and A2R61, connected to the
+6.2V and —6.2V reference voltage circuits through resis-
tors A2R36 to A2R39 and A2R51 through A2R54, are
used for output zero and offset adjustments. Relay A2K1
opens the input path to A2U1 when the BPS/A is remotely
controtied and the programmed dats is changed, thus, pre-
venting data transients from affecting the output voltage.
The AUTO/LOCAL switch A251 in the feedback loop is
normally left in the LOCAL position. The AUTO position
is used for auto-series or auto-paraliel operation when the
summing junction of the error amplifier must be availabie
for external error signal connections from other units,
449 Output Voltage/Gain Control Summary. As stated
previously, the BPS/A output voltage is developed utilizing
operational amplifier techniques. in the power supply mode,
the bipolar output characteristic is developed through the
summing of the internal fixed reference voltage (VREF) and
a voltage which is dependent only on a single programming
control IVOLTAGE control ABR2.0r a remote program:
ming resistance). Eg is given by the following equations
for the X1 and X4 ranges:
Rpv
A1R42
Re
RE
- } - \ mener
AIRE REF }
Ep = +V {
O REF A2R7
where:
Rpy = O to 20.48K5 (front panel VOLTAGE con-
trol or remote programming resistance)
Rp = feedback resistance (A2R16, or A2R9 + A2R16
+A2R42) = 10,24KQ or 40.95KQ (X1 or X4 range
respectively)
A1R42 = A2R6 = A2R7 = 10.24K82
VREF = 5.12V
4.7
in the X1 range:
R
Ео = 5.12\ | PV. , .10.24K | _ 5.12V (109.24K y
10.24K 10.24K 10.24K
EO=5.12V ( ZPV___4)
10.24K
therefore; EqQ= ~b5.12V, if Rpy=0
Eg = 0, if Rpy = 10.24K
EQ = +5.12V, if Rpy = 20.48K
In the X4 range:
R
Eo =5.12V (— PV. y 20888, _5,12y 10:96 ,
10.24K 10.24K 10.24K
4R
Ep = 5.124 { — LL A
10.24K
therefore; Ep = -20.48V, if Rpy= 0
Ес = 0, И Rpy = 10.24K
Ep = +20.48V, if Rpy = 20.48K
4-50 In the variable gain amplifier mode, the BPS/A
controls the gain of an externally applied de ог ac signal.
For this mode, the internal fixed dc reference voltage is
disconnected and the reference/gain control circuit attenu-
ates or amplifies the externally applied signal from 0 to 2X
depending upon the setting of the VOLTAGE control ASRZ
(or remote programming resistance). The feedback resis-
torís) provide a gain of 1 in the X1 range and a gain of 4
in the X4 range. Consequently, the variable gain is from О
to 2X in the X1 range and from 0 to BX in the X4 range.
in the fixed gain amplifier mode, the gain is controlled only
by the feedback resistor(s) which provide a times 1 gain in
the X1 range and a times 4 gain in the X4 range.
4-51 Current Comparison Amplifiers. Current compar-
ison amplifiers A2U3 (positive) and A2U4 (negative) con-
trol BPS/A operation between constant voltage and constant
current by continuousiy monitoring the voltage drop across
the current sampling resistor (A2R27). This voltage drop is
applied to the current comparison amplifiers via the front
panel CURRENT contro! ABR1 or the remote programming
input terminals. The other input to the current comparison
amplifiers is a stable fixed reference current. Any disturb-
ance in load current whether by variation of the CURRENT
control {or remote programming input} or in the current
flow through the sampling resistor (as in fine or load change)
will cause a corrective voltage to alter the appropriate series
requlator (positive or negative} conduction thereby restoring
the load current to some initial value,
4-52 Positive current comparison amplifier A2U3 moni-
tors positive output currents and negative current compari
son amplifier A2U4 monitors negative output currents. These
amplifiers control switching the BPS/A between constant
voltage and constant current operation. In constant voltage
operation, they are in saturation, reverse biasing A2CR13
and AZCR14 and preventing any current control action. in
constant current operation, they become linear comparison
amplifiers aliowing BPS/A operation as a constant current
source. Also, for current sink conditions, they fimit the
output current to 1/2 maximum rated output through sepa-
rate control circuits consisting of A2CR3, CR4, CR7, CRB,
CR11, CR12, R28, and R29. Because the two comparison
amplifiers are similar, only the positive current comparison
amplifier is described in detail.
4-53 The voltage drop across the current sampling resis-
tor A2R?7 is applied to pin 3 of A2U3 via the front panel
CURRENT control ASA 1 (or the remote programming input
terminals). Current contro! through ASA1 (local control) is
achieved with rear terminais A12, A13, and A14 strapped
together for positive currents and with A19, A20, and A21
strapped together for negative currents. External digital re-
sistance control can be implemented by connecting the
proper resistances between A13, A14 (strapped together)
and A18 for positive currents, and between A20, A21
{strapped together) and A18 for negative currents. Another
method of control of the current is through voltage pro-
gramming via terminals A14 and A18 and A20 and A18 for
positive and negative currents respectively,
4-54 A fixed reference current is applied to the other
input (pin 2) of A2U3. During constant voltage operation,
A2U3 is saturated causing the output to be positive. Zener
diode A2VR5 and diode A2CRS clamp the output at +7.5V
preventing A2U3 from going too far into saturation. For
this condition, diode A2CR 14 is back biased and PNP
switching transistor A2Q5 is turned off causing A2CR3 and
A2CR10 to be forward biased. With A2CR 14 back biased,
constant voltage operation is enabled and constant current
operation is disabled (the negative constant current diode
A2CR13 must also be back biased for this condition). With
A2CRY forward biased, transistor A1Q1 is turned-on aliow-
ing capacitor A2C3 to charge during constant voltage oper-
ation. This will speed up the transition from constant voit-
4-8
age to constant current operation. With A2CR 10 forward
biased, the CURRENT MODE indicator DS1 is off (A202
turned-on and A2Q3 turned-off) and the FLAG Output is
disabled (low level, FLAG output with A204 turned-on),
Networks consisting of A2C11, R63, R64 and A2C12, R65,
R66 are included in the inputs of A2U3 and A2U4 respec-
tively. These networks in conjunction with local compen-
sation represented by A2C9, R46, and R47 {common to
both A2U3 and A2U4) provide response stabilizing com-
pensation.
4-55 If the output current increases above the set value,
the input to pin 3 of A2U3 becomes less positive. For this
condition, the output {pin 6) of A2U3 goes negative forward
biasing A2CR14. With A2CR 14 forward biased, the BPS/A
switches from constant voltage to constant current operation
and an error signal is applied to alter the series regulator
(positive) conduction and maintain the output current at
the desired value. Also, for this condition, A205 is switched
on back biasing diodes A2CRS and A2CR 10. With A2CR9
back biased, A201 is turned-off. With A2CR 10 back biased,
the CURRENT MODE indicator DS1 lights (A2Q2 off,
A203 on) and the FLAG output is enabled {A2Q4 turned
off providing a high FLAG output).
4-56 During current sinking operations, the input to
A2U3 (negative voltage case) is altered causing the current
being sinked to increase or decrease in response to the volt-
age magnitude of the active load. When the output voltage
is negative, diodes A2CR3 and A2CR 12 become forward
biased through A2R28 altering the reference current to
A2U3. This condition in conjunction with the voltage
change across A2R27 will cause the output of A2U3 to
adjust the drive to the appropriate output transistors to
limit the imposed load current. The operation of A2U4 is
similar in principle for the positive voltage case. Front
pane! controls +1 ZERO {ATR2) and — | ZERO 1A1 R3),
in the positive and negative current reference circuits are
used to adjust the respective zero for programming accuracy,
Variable resistors A1R19 and A2R21 are used to calibrate
the positive and negative current references,
SECTION V
MAINTENANCE
5-1 INTRODUCTION
5-2 The performance checks (Paragraph 5-5) should be
made to check the operation of the BPS/A after repairs or
for periodic maintenance. These checks are also suitable for
incoming inspection. if a fault is detected in the BPS/A
while making the performance check or during normal oper-
ation, proceed to the troubleshooting procedures (Paragraph
5-60). After repair and replacement {Paragraph 5-84), per-
form any necessary adjustments and calibrations {Paragraph
5-08}. Before returning the BPS/A to normal operation, re-
peat the performance check to ensure that the fault has been
properly corrected and that no other fauits exist. Before
performing any maintenance checks, turn on the BPS/A and
allow a half-hour warm-up.
5-3 TEST EQUIPMENT REQUIRED
5-4 Table 5-1 lists the test equipment required to per-
form the various procedures described in this section.
Table 5-1. Test Equipment Required
REQUIRED RECOMMENDED
TYPE CHARACTERISTICS USE MODEL
Differentiai Sensitivity: B00uV full scale Measure dc voltages; calibration HP346013 with
Voitmeter (min.). procedures, Measure amplifier Option 001
Input impedance: 100M) (min.). gain (Option 001).
Digital Accuracy: 0.004% Measure de voltages, calibration HP3462A or
Voltmeter Sensitivity: 14Y, floating input. procedures. HP34208B
Oscilloscope Sensitivity and bandwidth: 1mV/ Measure ripple; display transient HP 180A plus
cm and S0MMz2, recovery waveforms; measure noise | 1801A, and 1821A,
spikes, Measure response. plug-ins,
Function 100M 2 squarewave and sinewave. Measure frequency response and HP3310A
Generator output impedance,
Distortion Accuracy: +3% from 10Hz to Measure amplifier distortion. HP331A
Analyzer MHz,
Variable Voltage Current rating: 2A; Range: 80- Vary ac input for high line to low
Transformer 130Vac; Equipped with voltmeter | line regulation.
accurate within 1 volt,
Repetitive Load Rate: 60-400Hz; 2usec rise and Measure transient response. See Figure 5-4.
Switch fall time.
Current Sampling Value: 182% .1%, Z4W Measure output current, calibrate
Resistor ammeter,
Resistive Loads Value: See Figure 5-1,+1%, 50W Load resistors.
Terminating Vajue: 50 ohms, AW, 15%, non- Noise spike measurement.
Resistors inductive, 4 required.
Blocking Values: 0.01uF, 100Vde, 2 Noise spike measurement; output
Capacitors required; 1000uF, SOVde, 1 impedance measurement.
required.
Programming
Resistors 10.24K + 05% 0811-2958
20.48K + 05% 0811-2959
(Micro Ohm
Type 132F)
51
5-5 PERFORMANCE TEST
5-6 The following test can be used as an incoming in-
spection check and appropriate portions of the test can be
repeated either to check the operation of the instrument
after repairs or for periodic maintenance terts. The tests
are performed using a 115Vac, 60Hz, single phase input
power source,
5-7 POWER SUPPLY MODE TESTS
5-8 All measuring devices must be connected to the
rear sensing terminals of the supply and not to the front
output terminals if maximum accuracy is to be obtained in
the following measurements. In addition, the measuring
devices must be connected as close to the sensing terminals
as possible. This is particularly important when measuring
the transient response, regulation, or ripple of the power
supply. Note that under no circumstances should the meas-
uring instruments be connected across the load. A measure-
ment made across the ioad includes the impedance of the
leads to the load and such lead lengths can easily have an
impedance several orders of magnitude greater than the sup
ply impedance, thus invalidating the measurement.
5-8 To avoid mutua! coupling effects, each monitoring
device must be connected to the sensing terminals by a sep
arate pair of leads. Twisted pairs or shielded two-wire cables
shouid be used to avoid pickup on the measuring leads. The
load resistor should be connected across the output termin-
als as close to the suppiy as possible. When measuring the
constant voltage performance specifications, the current con-
trois should be set weil above {at least 10%) the maximum
output current which the supply will draw, since the onset
of constant current action will cause a drop in output voit-
age, increased ripple, and other performance changes not
properly ascribed to the constant voltage operation of the
supply.
5-10 DC Voltage Output and Voitmeter Accuracy. To
check the DC voltage output and voltmeter accuracy, pro-
ceed as follows:
NOTE
The CURRENT MODE light should be off dur-
ing this test.
a. Connect high range load resistor {R{) across
output terminals {see Figure 5-1).
b. Connect DVM across +5 and —S terminals,
c. Set BPS/A front panel controls as follows:
MODE switch: POWER SUPPLY
RANGE switch: xa
VOLTAGE control: midposition
52
DIGITAL OR
DIFFERENTIAL
BPS/A UNDER TEST VOLTMÉTER {DVM}
<) -—
o
O +
Al &2 + -8f — +5] +
20 ;
Tagg
Ry.
RI ORNS)
HI RANGE 110 RANGE
о 2.5
Figure 5-1. Power Supply Mode Test Setup
CURRENT control: fully clockwise
VOLTAGE METER: high range DC
CURRENT METER: high range DC
d. Turn on BPS/A and allow a five-minute warm-
up period.
e. Turn VOLTAGE control clockwise untit DVM
indicates +20V.
f. Observe that front panel voltmeter reads +20V
+ 0.6V.
g. Turn VOLTAGE control counterclockwise until
DVM indicates —20V,
h. Observe that front pane! voltmeter reads -—20V
+ 0.6V.
i. Turn off BPS/A. Change load resistor Ry to
low range value (see Figure 5-1} and set RANGE switch to
X1.
ji. Repeat steps (d) through (h) for following DVM
and front pane! voltmeter readings (use low range DC scale).
DVM Voltmeter
+5V/—5V +5V + 150mY/—5Y + 150mV
5-11 Source EHect (Line Regulation).
‘Definition: The change AEour in the
static value of de output voltage resulting
from a change in ac input voltage over
the specified range from low line {usually
104/208 volts) to high line {usually 127/
‚ 254 volts), or from high line to low line,
NOTE
The CURRENT MODE light should be off dur-
ing this test. |
5-12 To check the line regulation, proceed as follows:
a. Connect the test setup shown in Figure 5-1. Use
high range (X4) load resistor value.
b. Connect variable auto transformer between the
input power source and the BPS/A power input,
c. Adjust variable transformer for a 104 volts ac
input,
d. Set BPS/A front panel controls as follows:
MODE switch: POWER SUPPLY
RANGE switch: X4
VOLTAGE control: midposition
CURRENT control: fully clockwise
VOLTAGE METER: high range DC
CURRENT METER: high range DC
e. Connect a DVM to the —S and +S terminals of
the BPS/A.
f. Turn on BPS/A and adjust VOLTAGE control
clockwise for maximum rated positive output voltage-thigh -
range) as indicated on DVM.
g. Adiust variable auto transformer for a 127 volts
ac input.
h. Reading on DVM should not vary from reading
in step {f) by more than 4mV.
i. Set variable auto transformer for a 104Vac input.
i. Adjust VOLTAGE control counterclockwise for
maximum rated negative high range outpus voltage, as indi-
cated on DVM,
k. Adjust variable auto transformer for a 127Vac
input.
1, Reading on DVM should not vary from reading
in step {j) by more than 4mV.
m. Turn off BPS/A and change load resistor to
low range {X1} value, and RANGE switch to Xi.
n. Adjust variable auto transformer for a 104Vae
input.
©. Turn on BPS/A and adjust VOLTAGE control
clockwise for the maximum rated positive output voltage
{low range}, as indicated on DVM.
p. Adjust variable auto transformer for a 127Vac
input.
q. Reading on DVM should not vary from reading
in step (0) by More than 4mV.
г. Set variable auto transformer for a 104Vac in-
put. ;
s. Adjust VOLTAGE control counterciockwise
for maximum rated negative low range output voltage, as
indicated on DVM.
t. Adjust variable auto transformer for a 127Vac
input.
J. Reading on DVM should not vary from reading
in step (s) by more than .4mV.
5-13 Load Effect (Load Regulation},
Definition: The change Aegytin the
5-3
static value of de output voltage resulting
from a change in load resistance from open
circuit to a value which yields maximum
rated output current {or vice versa).
NOTE
The CURRENT MODE light should be off dur-
ing this test.
5-14 The toad regulation check is performed at low line
conditions. To check load regulation, proceed as follows:
| a. Connect the test setup shown in Figure 5-1. Use
the high range (X4) load resistance value.
b. Connect variable auto transformer between the
input power source and the BPS/A power input. Adjust
variable auto transformer for a 104Vac input.
c. Set BPS/A front panel controls as follows:
MODE switch: POWER SUPPLY
RANGE switch: xd
VOLTAGE control: midposition
CURRENT control: fully clockwise
VOLTAGE METER: high range DC
CURRENT METER high range DC
d. Connect a DVM to the —8 and +8 terminals of
the BPS/A. |
e. Turn on BPS/A and adjust VOLTAGE contro!
clockwise for the maximum rated positivé output voltage
as indicated on DVM.
f. Disconnect load resistor. Reading on DVM
should not vary from the reading in step (e) by more than
2.5mV,
g. Adjust VOLTAGE control counterclockwise for
maximum rated negative output {high range}, as indicated
on DVM,
h. Connect load resistor (high range value). Read-
ing on DVM should not vary from reading in step (a) by
more than 2.5mV.
i. Turn off BPS/A and change load resistor to low
range {X1) value and RANGE switch to X1.
jo Turn on BPS/A and adjust VOLTAGE control
clockwise for the maximum rated positive output voltage
{{ow range}, as indicated on DVM.
k. Disconnect load resistor. Reading on DVM
should not vary from the reading in step {j} by more than
0.25mY.
I. Adjust VOLTAGE contro! counterciockwise for
the maximum rated negative output voltage (low range), as
indicated on DVM.
m. Connect oad resistor {low range value). Read-
ing on DVM should not vary from reading in step le) by
more than 0.25mV.
5-15 PARD (Ripple and Noise).
Definition: The residual AC voltage which
is superimposed on the DC output of a reg-
ulated power supply. Ripple and noise may
be specified and measured in terms of its
RMS or {preferably} peak-to-peak value.
5-16 Ripple and noise measurement can be made at any
input AC line voltage combined with any DC output voltage
and load current within rating.
517 The amount of ripple and noise that is present on
the power supply output is measured either in terms of the
RMS or {preferabiy) peak-to-peak value. The peak-to-peak
measurement is particularly important for applications
where noise spikes could be detrimental to a sensitive load,
such as logic circuitry. The RMS measurement is not an
ideal representation of the noise, since fairly high output
noise spikes of short duration could be present in the ripple
and not appreciably increase the RMS value.
5-18 The technique used to measure high frequency
noise or “spikes” on the output of a power supply is more
critical than the low frequency ripple and noise measure-
ment technique; therefore the former is discussed separately in
Paragraph 5-26.
5-19 Ripple and Noise Measurements, Figure 5-2A
shows an incorrect method of measuring p-p ripple. Note
that a continuous ground loop exists from the third wire
of the input power cord of the supply to the third wire of
the input power cord of the oscilloscope via the grounded
power supply case, the wire between the negative output
terminal of the power supply and the vertical input of the
scope, and the grounded scope case. Any ground current
circulating in this loop as a result of the difference in poten-
tial EG between the two ground points causes an IR drop
which is in series with the scope input. This IR drop, norm-
ally having a 60Hz line frequency fundamental, plus any
pickup on the unshieided leads interconnecting the power
supply and scope, appears on the face of the CRT. The
magnitude of this resulting noise signal can easily be much
greater than the true ripple developed between the plus
and minus output terminals of the power supply, and can
completely invalidate the measurement,
5-20 The same ground current and pickup problems can
exist if an RMS voltmeter is substituted in place of the oscil-
loscope in Figure 5-2. However, the oscilloscope display,
uniike the true RMS meter reading, tells the observer im-
mediately whether the fundamental period of the signal dis-
played is 8.3 milliseconds {1/120Hz) or 16.7 milliseconds
{1/80Hz). Since the fundamental ripple frequency present
on the output of an HP supply is 120Hz (due to fuil-wave
5-4
POWER SUPPLY CASE OSCILLOSCOPE CASE
AC
ACC
AC
ACC
GND
|
|
|
|
L
A. INCORRECT METHOD -GROUND CURRENT is PRODUCES 60
CYCLE DROP IN NEGATIVE LEAD WHICH ADOS TO THE POWER
SUPPLY RIPPLE DISPLAYED ON SCOPE.
Re 38
nlf Wi I ALL die lili o DD dis bli NA A E E
POWER SUPPLY CASE OSCILLOSCOPE CASE
q + + |
USE 3-T0-2 OC тат
ADAPTER TO - ©; VERTICAL
BREAK GND PATH 46 TT BREAK y INPUT
GND PATH
B. A CORRECT METHOD USING A SINGLE - ENDED SCOPE.
OUTPUT FLOATED TO BREAX GROUND CURRENT LOOP TWISTED
PAIR REDUCES STRAY PICKUP ON SCOPE LEADS
Y CASE OSCILLOSCOPE CASE
AC
Ry ACC
+
_ VERTICAL
INPUT
C. A CORRECT METHOD USING A DIFFERENTIAL SCORE with
FLOATING INPUT GROUND CURRENT PATH IS BROKEN; COMMON
MODE REJECTION OF DIFFERENTIAL INPUT SCOPE IGNORES
DIFFERENCE IN GROUND POTENTIAL OF POWER SUPPLY a
SCOPE, SHIELDED TWO WIRE FURTHER REDUCES STRAY
PICK-UF ON SCOPE LEADS.
R; (OHMS)
Hi RANGE {LD RANGE
10 25
Figure 5-2. Ripple and Noise, Test Setup
rectification}, an oscilloscope display showing a 120Hz
fundamental component is indicative of a “clean” measure-
ment setup, while the presence of a 60Hz fundamental usu-
ally means that an improved setup will result in a more ac-
curate {and lower} value of measured ripple.
5-21 Figure 5-2B shows a correct method of measuring
the output ripple of a constant voltage power supply using
a single-ended scope. The ground loop path is broken by
floating the power supply. Note that to ensure that no
potential difference exists between the supply and the oscil-
toscope it is recommended that whenever possible they both
be plugged into the same ac power buss. 1f the same buss
cannot be used, both ac grounds must be at earth ground
potential.
5.22 Either a twisted pair or {preferably} a shielded two-
wire cable shouid be used to connect the output terminals
of the power supply to the vertical input terminals of the
scope. When using a twisted pair, care must be taken that
one of the two wires is connected to the grounded input
terminal of the oscilloscope. When using shielded two-wire,
it is essential for the shield to be connected to ground at
one end only so that no ground current will flow through
this shield, thus inducing a noise signal in the shielded leads.
5-23 To verify that the oscilloscope is not displaying
ripple that is induced in the leads or picked up from the
grounds, the (+) scope lead should be shorted to the (--)
scope lead at the power supply terminals. The ripple value
obtained when the leads are shorted should be subtracted
from the actual ripple measurement.
5-24 in most cases, the single-ended scope method of
Figure 5-28 will be adequate to eliminate non-real compon-
ents of ripple and noise so that a satisfactory measurement
may be obtained. However, in more stubborn cases it may
be necessary to use a differential scope with floating input
as shown in Figure 5-2C. If desired, two single conductor
. shielded cables may be substituted in piace of the shielded
two-wire cable with equal success. Because of its common
mode rejection, a differential oscilloscope displays only the
difference in signal between its two vertical input terminals,
thus ignoring the effects of any common mode signal intro-
duced because of the difference in the ac potential between
the power supply case and scope case. Before using a differ-
ential input scope in this manner, however, it is imperative
that the common mode rejection capability of the scope be
verified by shorting together its two input leads at the power
supply and observing the trace on the CRT. if this trace is not
a straight line, then the scope is not rejecting the ground
signal and must be realigned in accordance with the manu-
facturer’s instructions until proper common mode rejection
is attained.
5-25
follows:
a. Connect the oscilloscope or RMS voltmeter as
shown in Figures 5-2B or 5-2C, Set MODE switch to
POWER SUPPLY, Turn CURRENT control fully clockwise,
b. Adjust VOLTAGE contro! in the X1 and X4
ranges until front panel meter indicates maximum rated out
put voitage. Check both maximum rated positive and nega-
tive output voltages.
©. The observed ripple and noise should be less
To check the ripple and noise output, proceed as
than:
X1 Bange X4 Range
1.5mVrms/4mVp-p bmVrms/15mVp-p
55
5.26 Noise Spike Measurement. When a high frequency
spike measurement is being made, an instrument of suffic-
tent bandwidth must be used; an oscilloscope with a band-
width of 20MHz or more is adequate. Measuring noise with
an instrument that has insufficient bandwidth may conceal
high frequency spikes detrimental to the load.
6-27 The test setups illustrated in Figures 5-2A and
5-28 are generally not acceptable for measuring spikes; a
differential oscilloscope is necessary. Furthermore, the
measurement concept of Figure 5-2C must be modified if
accurate spike measurement is to be achieved:
a. As shown in Figure 5-3, two coax cables, must
be substituted for the shielded two-wire cable,
b. Impedance matching resistors must be inciuded
to eliminate standing waves and cable ringing, and the cap-
acitors must be connected to biock the DC current path.
c. The length of the test leads outside the coax is
critical and must be kept as short as possible; the blocking
capacitor and the impedance matching resistor should be
connected directiy from the inner conductor of the cable
to the power supply terminals,
d. Notice that the shields of the power supply end
of the two coax cables are not connected to the power sup-
ply ground, since such a connection would give rise to a
ground current path through the coax shield, resulting in an
erroneous measurement.
€. Since the impedance matching resistors consti-
tute a 2-to-1 attenuator, the noise spikes observed on the
oscilioscope should be less than:
XT Range X4 Range
2mVp-p instead of 7.5mVp-p instead of
4mVp-p 15mVp-p
Son
TERMINATION
POWER SUPPLY T-CONNECTOR mm OSCILLOSCOPE
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Figure 5-3. CV Noise Spike Tast Setup
5-28 Transient Recovery Time.
Definition: The time X” for the output
voltage recovery to within “Y” miilivolts
of the nominal output voltage following
a “Z” amp step change in load current,
where: "Y" is specified as 20mV, the
nominal output voltage is defined as
the dc level between the static output
voltage before and after the imposed
load change, and “Z” is the specified
load current change of the full toad
current rating of the supply,
5-29 Transient recovery time may be measured at any
input line voltage combined with any output voltage and
load current within rating.
5-30 Reasonabte care must be taken in switching the
load resistance on and off. A hand-operated switch in series
with the load is not adequate, since the resulting one-shot
displays are difficult to observe on most oscilloscopes, and
the arc energy occurring during switching action completely
masks the display with a noise burst,
5-31 A mercury-wetted relay, as connected in the load
switching circuit of Figure 5-4 should be used for loading
and unloading the supply. When this load switch is connec:
ted to a 60Mz ac input, the mercury-wetted relay will open
and close 60 times per second. Adjustment of the 25K con-
trol permits adjustment of the duty cycle of the load current
switching and reduction in jitter of the oscilloscope display.
OSCILLOSCOPE |
+ 6
ES
POWER SUPPLY
UNDER TEST
o
CONTACT PROTECTION
NETWORK <R
$e
0.58, sw to
OAuF NOTE 2}
Le de NOTES:
Г I. THIS DRAWING SHOWS A
| ort SUGGESTED METHOD OF
BUILDING A LOAD SWITCH,
| ; 4 HOWEVER OTHER METHODS
| LINE | COULD BE USED: SUCH AS
SWITCH Ë A TRANSISTOR SWITCHING
RATINGS OF LOAD SWITCH
ARE: SAMPS, SOOV. 250%
{NOT 2500W)
2. USE MERCURY RELAY;
CLARE TYPE HGP 1002 OR
sac | REPETITIVE | WE. TYPE 2768.
60hH7 | L040 SWITCH (NOTE 1) | 3. USE WIRE WOUND RESISTOR.
js E ET PRA TROYES
|
|
| NETWORK. MAXIMUS LOAD
|
|
|
Figure 54. Transient Recovery Time Test Setup
5-32 To check the transient recovery time, proceed as
follows:
a. Connect test setup shown in Figure 5-4. Set
MODE switch to POWER SUPPLY and RANGE switch to
X4,
b. Turn CURRENT control fully clockwise.
¢. Turn on supply and adjust VOLTAGE control
clockwise until front panel ammeter indicates maximum
positive rated cutput current,
d. Close fine switch on repetitive load switch set
up.
e. Set oscilloscope for internal sync and lock on
either positive or negative load transient spike.
f. Set vertical input of oscilloscope for ac coupling
so that small dc level changes in power supply output voltage
will not cause display to shift.
g. Adjust the vertical centering on the scope so
that the tail ends of the no load and full load waveforms are
symmetrically displayed about the horizontal center line of
the oscilloscope. This center line now represents the nom-
inal output voltage defined in the specification.
h. Adjust the horizontal positioning control so that
the trace starts at a point coincident with a major graticule
division. This point is then representative of time zero.
i. Increase the sweep rate so that a single transient
spike can be examined in detail.
j. Adiust the sync controls separately for the posi
tive and negative going transients so that not only the recov-
ery waveshape but also as much as possible of the rise time
of the transient is displayed.
k. Starting from the major graticule division repre-
sentative of time zero, count to the right 10Qusec and verti-
cally ZO0mV., Recovery shouid be within these tolerances as
illustrated in Figure 5-5.
our
UNLOADING
TRANSIENT
HOMINAL À
DUTPLT 1 peur E FE
VOLTAGE {
; LOADING
TRARSIENT
boe§ 34g
EouT
Eout
3 NOMINAL f
DUTPUT $ лини бр Е
Л VOLTAGE
20m
¡QÓN SEC
т KOuSEC
20my
НОМ А, + V
OUTPUT —l TEME
A
VOLTAGE UNLCA DING LOADING
TRANSIENT TRANSIENT
Figure 5.5. Transient Recovery Time, Waveforms
Eg = rms voltage across power supply output
HP 80 terminals.
ВР5/А UNDER TEST — OSCILLOSCOPE В = 1000
(HI CUTI+ O | O Ein = 10 volts
4D 0MI- O | o a. The output impedance should be less than .5
MINO Som] | milliohm.
© HPA3I0A
OUT COM 1 oneTioN + 20 == we moe meine ome di {fe
GENERATOR
}
|
Ш
|
Figure 5-6, Programming Speed, Test Setup | ‚
|
Ё
5-33 Programming Speed. To check the unit's program-
ming speed, a square wave is applied to the unit and it is op- A E _
erated in the amplifier mode. This has the same effect as le 50 à SEC !
1 . . a 1 # rer
rapidiy programming the unit, up and down, in the power
supply mode. To make this test, proceed as follows:
a. Connect test setup as shown in Figure 5-6.
b. Set MODE switch to VAR GAIN AMPL, Figure 5-7. Typical Programming Speed Waveforms
RANGE switch to X4, and turn unit on.
¢. Rotate VOLTAGE control fully clockwise.
d. On function generator, set input frequency to
about 100Mz squarewave and adjust amplitude to obtain OTE TER OLTMETER
maximum rated peak-to-peak output signal on oscilloscope INDICATES Eo) INDICATES EN)
{-20V to +20V).
e. Adjust oscilloscope to observe rise time of one
squarewave. The waveshape shouid be within the tolerances о ос соо
shown on Figure 5-7 (output should change from maximum |
rated negative value to maximum rated positive value in less | pré 208
than 50usec). BPS/A UNDER TEST GENERATOR
f. Check the fail time of one squarewave. lt should
be almost identical to the rise time except for inversion.
$
uf + |
534 Cutput impedance. To check the output imped- 7 |
ance, proceed at follows: | E Че
a. Connect test setup as shown in Figure 5-8, VW *
b. Set MODE switch to POWER SUPPLY, RANGE
switch to X4, and turn unit on.
¢. Adjust VOLTAGE control until front panel
meter reads +20V, Figure 5-8. Output impedance, Test Setup
d. Set AMPLITUDE control on Osciliator to 10
volts {Ein}, and FREQUENCY control to 100Hz sinewave.
e. Record voltage across output terminals of the
power supply {Eq} as indicated on AC voltmeter.
{. Calculate the output impedance by the foilow-
ing formula:
5-35 Temperature Coefficient,
Definition: The change in output voltage
per degree Centigrade change in the am-
bient temperature under conditions of
Zout = бой constant input ac line voltage, output volt-
Ein Eo age setting, and load resistance.
5-7
5-36 The temperature coefficient of a power supply is
measured by placing the power supply in an oven and vary-
ing it over any temperature span within its rating. {Most
HP power supplies are rated for operation from 0°C to
55°C.) The power supply must be allowed to thermally
stabilize for a sufficient period of time at each measurement
temperature.
5.37 The temperature coefficient given in the specifica-
tions is the maximum temperature-dependent output voitage
change which will result over any one degree Centigrade in-
terval. The differential voltmeter or digital voltmeter used
to measure the output voltage change of the supply should
be placed outside the oven and should have a long term
stability adequate to insure that its drift will not affect the
Overall measurement accuracy.
5-38
foliows:
a. Connect load resistance (high range) and differ-
ential voltmeter as illustrated in Figure 5-1.
To check the temperature coefficient, proceed as
NOTE
Connect voltmeter to tS terminals, NOT across
Joad.
b. Set MODE switch to POWER SUPPLY and
RANGE switch to X4. Turn CURRENT contro! fully
clockwise.
e. Adjust front panel VOL TAGE control until
front pane! voltmeter indicates maximum rated output
voltage.
d. Place power supply in temperature-controlied
oven {differential voltmeter and load remains outside oven).
Set temperature to 30°C and aliow 30 minutes for stabilization.
e. Record differential voltmeter reading.
f. ‘Raise temperature to 40°C and aliow 30 min-
utes for stabitization.
9. Observe differential voltmeter reading. Differ-
ence in voltage reading between step (e) and (g) should be
less than 35mV,
h. Repeat steps (a) through (g} with low range (X1)
toad resistance connected as shown in Figure 5-1, Set
RANGE switch to X1.
i. Observe differential voltmeter readings. Differ.
ence in voltage reading between step (e) and {g) shouid be
less than 8.5mV.
Drift (Output Stability),
Definition: The change in output voltage
for the first eight hours foliowing a 30-
minute warm-up period. During the inter-
val of measurement all parameters, such
9-39
58
as load resistance, ambient temperature,
and input line voltage are held constant.
5-40 This measurement is made by monitoring the out-
put of the power supply on a differential voltmeter or digi-
tal voltmeter over the stated measurement interval; a strip
chart recorder can be used to provide a permanent record.
A thermometer should be placed near the Supply to verify
that the ambient temperature remains constant during the
period of measurement. The supply should be put in a
location immune from stray air currents {open doors or
windows, air conditioning vents}; if possible, the supply
should be placed in an oven which is held at a constant телу
perature. Care must be taken that the measuring instrument
has a stability over the eight hour interval which is at least
an order of magnitude better than the stability specification
of the power supply being measured. The supply will drift
considerably less over the eight hour measurement interval .
than during the half-hour warm-up.
5-41 To check the output stability, proceed as follows:
a. Connect load resistance (high range) and ditfer-
ential voltmeter as illustrated in Figure 5-1.
b. Set MODE switch to POWER SUPPLY and
RANGE switch to X4. Turn CURRENT control fully
clockwise.
c. Adjust front panel VOLTAGE control ciock-
wise until differential voltmeter indicates maximum rated
output voltage.
d. Allow 30 minutes warm-up, then record differ-
ential voltmeter reading.
e. After 8 hours, differential voltmeter should
change from reading recorded in step {d) by less than 11mV
{pot wiper jump effect may add 20mV).
tf. Repeat steps (a) through (e) with low range (X1)
load resistance connected as shown in Figure 5-1. Set
RANGE switch to X1.
g. Observe differential voltmeter reading. Differ.
ence in voltage reading between step (d) and (e) should be
less than 2.5mV (pot wiper jump effect may add 5mY),
NOTE
If remote programming is employed. the potenti
ometer wiper jurnper effect is eliminated.
5-42 CONSTANT CURRENT TESTS
543 The instruments, methods, and precautions for the
proper measurement of constant current power supply char-
acteristics are for the most part identical to those aiready
described for the measurement of constant voltage power
supplies. There are, however, two main differences: First,
the power supply performance will be checked between
short circuit and full load rather than open circuit and full
icad. Second, a current monitoring resistor is inserted be-
tween the output of the power supply and the toad.
CURRENT SAMPLING
TERMINALS
TO R TO
UNGROUNDED L GROUNDED
TERMINAL OF , TERMINAL OF
POW POWER
RES {STOR
LOAD
TERMINALS
Figure 59, Current Sampling Resistor Connections
5-44 For at! output current measurements the current
sampling resistor must be treated as a four terminal device.
In the manner of a meter shunt, the joad current is fed to
the extremes of the wire leading to the resistor while the
sampling terminals are located as close as possible to the
resistance portion itself (see Figure 5-9). Generally, any
current sampling resistor should be of the low noise, low
temperature coefficient (less than 20ppm/°C) type and
should be used at no more than 10% of its rated power so
that its temperature rise will be minimized.
NOTE
The CURRENT MODE light should be on dur-
ing these tests.
5-45 Rated Output and Meter Accuracy.
a. Connect test setup shown in Figure 5-10. Use
high range load resistor {R{ } connected in series with the
182 resistor {Rg).
b. Set BPS/A front panel controls as follows:
MODE switch: POWER SUPPLY
RANGE switch: xa
VOLTAGE control: fully clockwise
CURRENT control: {fully counterclockwise
VOLTAGE METER: high range DC
CURRENT METER: high range DC
c. Turn on BPS/A and adjust CURRENT control
until front pane! ammeter indicates maximum rated positive
output current.
d. DVM should read +2.0Y.
e. Turn VOLTAGE control fully counterclock-
wise and adjust CURRENT control until front pane! am-
59
BPS /A UNDER TEST
Al AZ + -S — +8 + RL
еее LOAD
RESISTOR
CURRENT
SAMPLING
RESISTOR
RAY
DIGITAL CR Rs
DIFFERENTIAL iQ
VOLTMETER {DVM}
о
+ © |
R, (OHMS)
ÍHI RANGE | LO RANGE
i à 15
Figure 5-10, Constant Current, Test Setup
meter indicates maximum rated negative output current,
f. DVM should read ~2.0V.
Source Effect {Line Regulation).
Definition: The change À our in the
static value of dc output current resulting
from a change in ac input voltage over the
specified range from low line {usually 104
volts) to high line {usually 127 volts), or
from high line to low line.
5-46
To check the line regulation, proceed as follows:
a. Utilize test setup and front panel settings of
Paragraph 5-45. |
b. Connect variable auto transformer between in-
put power source and power supply power input.
с. Adjust auto transformer for 104Vac input.
d. Turn VOLTAGE contro! fully clockwise.
e. Adjust CURRENT contro! until front panel am-
meter reads exactly maximum rated positive output current.
f. Read and record voltage indicated on differential
voltmeter.
g. Adjust variable auto transformer for 127Vac
input,
h. Reading on differential voltmeter should not
vary from reading recorded in step (f) by more than
+450uV.
i, Turn VOLTAGE control fully counterclock-
wise and repeat steps (e) through (h) for negative output
Current.
Load Effect {Load Regulation).
Definition: The change AlouT in the
static value of the de output current result-
ing from a change in load resistance from
short circuit to a value which yields maxi-
mum rated output voltage,
5-47
5-48 To check the constant current load regulation, pro-
ceed as foliows:
a. Utilize test setup and front pane! settings of
Paragraph 5-45.
b. Turn VOLTAGE control fully clockwise.
©. Adjust CURRENT control untii front panel
meter reads exactly maximum rated positive output voltage.
d. Read and record voitage indicated on differen-
tial voltmeter.
e. Short circuit load resistor (Ry ).
f. Reading on differentia! voltmeter should not
vary from reading recorded in step (d) by more than +450uY.
9. Turn VOLTAGE contro! fully counterciock-
wise and repeat steps (c) through (f) for negative output
voltage.
5-49 Rippie and Noise,
Definition: The residual ac current which
is superimposed on the de output current
of a regulated power supply. Ripple and
noise may be specified and measured in
terms of its RMS or (preferably) peak-to-
peak value.
5-50 Most of the instructions pertaining to the ground
ioop and pickup problems associated with constant voltage
ripple and noise measurements also apply to the measure.
ment of constant current ripple and noise. Figures 5-11 and
5-12 illustrate the most important precautions to be ob-
served when measuring the ripple and noise of a constant
current supply. The presence of a 120Hz waveform on the
oscilloscope is normally indicative of a correct measurement
method. A waveshape having 60Hz as its fundamental com-
penent is typically associated with an incorrect measurement
setup.
5-51 Ripple Measurement, To check the output ripple,
proceed as follows:
a. Connect the oscilloscope as shown in Figures
8-11B or 511C.
b. Rotate the VOLTAGE control fully cw.
e. Set RANGE switch to X4, MODE switch to
POWER SUPPLY and turn on BPS/A,
POWER SUPPLY CASE
AC
АСС
АС
АСС
| +
i —
{ +
| EG
LA.
=
Rs
“Ау
A. INCORRECT METHOD — GROUND CURRENT 1g PRODUCES 60
CYCLE DROP IN NEGATIVE LEAD WHICH ADDS T0 THE POWER
SUPPLY RIPPLE DISPLAYED ON SCOPE.
i EERE ee EE meer EY le we WRAY Eel pres md
Y CASE OST CASE
AL
ACC
Ry
TWISTED №
® LENGTH OF LEAD BETWEEN Ry AND OUTPUT
TERMINAL OF POWER SUPPLY MUST BE HELD TO ABSOLUTE
MINIMUM.
B.A CORRECT METHOD USING A SINGLE - ENDED SCOPE.
OUTPUT FLOATED TO BREAK GROUND CURRENT LOOP, TWISTED
PAIR REDUCES STRAY PICKUP ON SCOPE LEADS.
BREAK
GND
PATH
D
SUPPLY CASE CASE
ACC
SHIELDED
TWO - WIRE
# LENGTH OF LEAD BETWEEN Ry AND GROUNDED QUTPUT
TERMINAL OF POWER SUPPLY MUST BE HELD TO ABSOLUTE
MINIMUM.
C. À CORRECT METHOD USING A DIFFERENTIAL SCOPE WITH
FLOATING INPUT. GROUND CURRENT PATH 15 BROKEN,
COMMON MODE REJECTION OF DIFFERENTIAL INPUT SCOPE
IGNORES DIFFERENCE IN GROUND POTENTIAL OF POWER
SUPPLY & SCOPE, SHIELDED TWO- WIRE FURTHER REDUCES
STRAY PICKUP ON SCOPE LEAD.
Ar
1,01%
Re
sû
Figure 5-11. CC Ripple and Noise Test Setup
d. Adjust CURRENT control until front panel
meter reads exactly the maximum rated positive output
current.
e. The observed ripple shouid be less than 10mV
PP.
f. Turn VOLTAGE contro! fully counterclock-
wise and repeat steps (d) and (e) for maximum rated nega-
tive output current.
5-10
ton
TERMINATION
POWER SUPPLY T-CONKECTOR OSCILLOSCOPE
CASE CASE
+ O O4F NN + A
©» w= + > De
VERTICAL
sos i Ренат
É >
AL
e
AL END
act € ) a
GND | DuF ‚ ; VERTICAL
y - A és > + RPT
son J +
#LENGTM OF LEAD BETWEEN Ry in
AND GROUNDEC OUTPUT T- CONNECTOR
TERMINAL CF POWER SUPPLY so
MUST BE HELD TO ABSOLUTE TERNINATION
NETA TRA EA
Figure 5-12. Constant Current Noise Spike Test Setup
5-52 Noise Spike Measurement. To check the noise
spike output, proceed as follows:
a. Connect test setup shown in Figure 5-12.
b. Turn VOLTAGE control fully clockwise.
c. Set RANGE switch to X4, MODE switch to
POWER SUPPLY, and turn on BPS/A.
d. Adjust CURRENT control until front panel
ammeter indicates the exact maximum rated positive output
current.
e. Since the impedance matching resistors consti-
tute à 2:1 divider, the observed noise spikes should be less
than SmY p-p.
5-53 Current Sink Test. The current sink test is per-
formed using two BPS/A's. One is used as a test instrument
and the other is used as a source instrument. Two identical
BPS/A's are preferred to perform this test.
CAUTION _
If two BPS/A’s of the same model are not avail-
able, this test can be performed utilizing anv
other Bipolar supply. However, it is of the
utmost importance that the BPS/A output volt.
age be set below the other supply so that it will
sink rather than force the other supply to sink
which it may not be capable of doing.
To check the current sink performance of the BPS/A, pro-
ceed as follows:
a. On the test instrument, set controls as follows:
MODE switch: POWER SUPPLY
RANGE switch: xa
VOLTAGE control: fully clockwise
CURRENT control: — fully clockwise
b. On the source instrument, set controls as
follows:
MODE switch: FXD GAIN AMP
RANGE switch: xa
c. Turn on test instrument and set output to +20V.
d. Connect function generator to terminals À 1
and ÀZ of source instrument. Turn on and adjust source
instrument output to 40V p-p at 100Hz (approximately).
e. Turn off test and source instruments and con-
nect test setup of Figure 5-13.
f. Turn on both instruments simuitaneously and
observe that waveform sampled across the 1 ohm resistor
is as illustrated in Figure 5-14.
g. Repeat test with VOLTAGE control on test in-
strument set fully counterclockwise. Waveform should be
same as Figure 5-14,
Maps sa
{SOURCE INSTRUMENT }
* gp 5/A
(TEST INSTRUMENT)
+ AAA
Y Y Y
vir
Q
#X MP480 HP 330A
OSCILLOSCOPE FUNCTION
GENERATOR
À TEST AND SOURCE INSTRUMENT SHOULD BE SAME MODEL.
#4 OSCILLOSCOPE FLOATED OFF LINE GROUND
Figure 5-13, Current Sink Test Setup
+ 1.2v
| |
—1,2V
Г
Figure 5-14, Current Sink Test Waveform
5-54 Overcurrent Protection Test. To check the over-
current protect circuit, proceed as follows:
a. Set BPS/A front panel controls as follows:
MODE switch: FXD GAIN AMP
RANGE switch: xa
VOLTAGE control: fully clockwise
CURRENT control: fully clockwise
b. Appiy a 5V p-p, 100Hz squarewave to the À 1
(HI IN} and A2 (LO IN} terminals. |
c. Connect a 192, BW resistor across + (H! OUT)
and — (LO OUT) terminais. Connect oscilloscope across
10 resistor.
d. Turn on BPS/A and observe waveforms (see
Figure 5-15). Overshoot should not exceed 5V p-p.
1 |
|
ЗУ
— ul
Figure 5-15. Overcurrent Protect Test Waveform
5.55 Turn-on/off Transient Protect. To test the turn-on
/off transient protect circuit proceed as follows:
a. Set front panel controls as follows:
MODE switch: POWER SUPPLY
RANGE switch: X4
VOLTAGE control: fully clockwise
CURRENT control: fully clockwise
b. Connect a clip lead from base of A3Q1 to
ground (2)
¢. Turn on BPS/A, Output should be from 0 to
1.5Vde,
d. Remove clip lead, output should be +20V.
e. Repeat steps (a) through (d) except turn VOLT-
AGE control fully cow for —20V output.
5-56 AMPLIFIER MODE TESTS
5-57 Gain and Meter Accuracy Test. To check gain and
the meter accuracy in the amplifier modes, proceed as fol-
lows:
a. Connect the test setup as shown in Figure 5-16,
Use the appropriate low range load resistor (Ry).
b. Set BPS/A front panel controls as follows:
MODE switch: VAR GAIN AMP
RANGE switch: X1
pe m
VOLTAGE control: fully clockwise
CURRENT control: fully clockwise
VOLTAGE METER: low range AC
CURRENT METER: high range AC
Cc. Set generator frequency at 100Hz sinewave and
output at 2V peak-to-peak.
d. Turn on BPS/A and allow a five minute warm-
up period,
e. Connect oscilloscope to +5 and —S terminais.
f. Adjust VOLTAGE control to obtain a 4V pp
reading on the oscilloscope.
g. Observe that front panel voltmeter reads 1.4V
rms and the front panel ammeter reads .56A rms,
h. Turn off BPS/A and connect appropriate high
range load resistor. Set RANGE switch to X4 and VOLT-
AGE METER switch to high range AC. Increase generator
output to DV pp.
i. Turn on BPS/A and observe oscilloscope for a -
40V p-p signal.
1. Observe that front panel voltmeter reads 14V
rms and front panel ammeter reads 1.4A rms.
k. Set MODE switch to FXD GAIN AMP MODE
and increase generator output to 10V p-p.
i. Observe a 40V p-p signal on oscilloscope.
BPS/A UNDER TEST
RL
LOAD
Ex q Ne
fig
à CURRENT
a LIN
RESISTOR
D ©
QUE COM
PUT
COM
FUNCTION KP 531A
GENERATOR DISTORT ION
HP 3310 ANALYZER
- ol]
+ ©-
БУМ (АС)
OSCILLOSCOPE
RE {OHMS)
HI RANGE TD RANGE
9 12
5-12
Figure 5-16. Amplifier Mode Test Setup
5 % o£ Fe
@ 994€
5-58 Frequency Response. To check amplifier mode
frequency response, proceed as follows:
a. Connect the test setup as shown in Figure 5-16.
b. Set MODE switch to VAR GAIN AMP and set
VOLTAGE and CURRENT controls fully clockwise.
c. Set HP3310A generator output at 100Hz sine-
wave and adjust signal amplitude to provide 40V p-p output.
d. Adjust the generator frequency until output
drops to 27V p-p. This frequency should not be less than
15kHz.
e. Set MODE switch to FXD GAIN AMP and re-
peat steps {c} and (d) above. Frequency should not be less
than 35kHz,
5-59 Distortion Test. To check the total harmonic dis-
tortion {THD in the amplifier output, proceed as follows:
a. Connect the test setup as shown in Figure 5-16.
b. Set MODE switch to VAR GAIN AMP,
c. Set generator at 100Hz sinewave and adjust out-
put for full BPS/A output voltage and current with appro-
priate load.
d. Measure the distortion at the output using HP
331A Distortion Analyzer.
e, The THD should be less than .1%,
NOTE
The above is a difficult measurement because the
THD is so low. Most audio generators will con-
tain more than . 1% THD in their output. A first
order figure can be obtained by the following re-
jationship:
5-61 GENERAL
5-62 Before attempting to troubleshoot this instrument,
ensure that the fault is with the instrument and not with an
associated circuit, The performance test (Paragraph 5-5) en-
ables this to be determined without removing the instru-
ment's covers. A good understanding of the principles of op-
eration is a helpful aid in troubleshooting, and it is recom:
mended that the reader review Section IV of the manual be-
fore attempting to troubleshoot the instrument. Once the
principles of operation are understood, refer to the trouble
isolation procedures.
5-63 Figure 7-1 is a simplified schematic of the BPS/A
and is useful in tracing signal flow through the entire instru-
ment. Figure 7-2 {2 Sheets) is a detailed schematic of the
unit. The circled test point numbers on Figure 7-2 are
also marked on the component location diagrams which ac-
company the schematics. References are made to these test
points in the troubleshooting procedures. |
564 OVERALL TROUBLE ISOLATION PROCEDURE
5-65 Figure 5-17 illustrates the overall scheme of the
trouble isolation and troubleshooting procedures which
follow. The trouble isolation procedures represented by the
boxes in the left-hand column are intended to localize a
problem to a particular area, both by direct testing and a
process of elimination. Instructions at each stage of the iso-
tation procedure direct you to the appropriate troubleshoot:
ing instructions, if required. These steps must be followed
in the order in which they are given so that circuits are oper-
THD of Amplifier = 2 2
р THD of (gen.+amp} — THD gen.
560 TROUBLESHOOTING
WARNING
The following troubleshooting procedures
are performed with power applied to the
BPS/A while its protective covers are re-
moved. Be careful when performing the
procedures as line voltage is always pres-
ent on the power input connector, fuse
holder, and in the power supply rectifier
circuits. In addition, when the supply is
on, energy available at many points, par-
ticularly the power transistors on the rear
heat sink, may result in personal injury or
death when contacted.
ational that are needed for testing other circuits, It is not
necessary to make any calibration adjustments until troeuble-
shooting has been completed. At that time, any necessary
adjustments should be made and then the performance test
of Paragraph 5-5 should be completed,
CAUTION
Trouble isolation by swapping a good board for
a suspected faulty one is not recommended un-
less it is certain that the fault is not destructive.
5-66 Preliminary Trouble Isolation Checks. Make the
following checks for obvious troubles before continuing
with the troubleshooting procedures.
1. Check that the rear terminal strapuing is correct
for local or remote programming (see Section 111).
CAUTION
The rear terminals must be strapped correctly
before power is applied to the instrument.
513
peo TROUBLE ISOLATION woman, wwe TROUBLESHOOTING
PRELIMINARY TROUBLE |
ISOLATION.
DEFECTIV CHECK FOR
START ——0l (MAIN POWER, FUSE, E > OBVIQUS FAULTS.
SWITCHES, ETC.) IPARAGRAPH 5- 66)
(PARAGRAPH 5-66)
REPAIR COMPLETED
SATISFACTORY
SUPPLY VOLTAGES ON
A! BOARD AND SUPPLY VOLTAGE
REFERENCE VOLTAGES DEFECTIVE » TROUBLESHOOTING.
ON AZ BOARD. (TABLE 5-2)
(PARAGRAPH 5-67)
REPAIR COMPLETED
y SATISFACTORY
OVERALL TROUBLE
ISOLATION GUIDE AND TROUBLE ISOLATED TO BOARD OR COMPONENT
BOARD ISOLATION q
PROCEDURE.
(PARAS 5-68 THRU 5-70 , ;
COMPONENT A2 BOARD SN neo evo
TROVBLESHOOTING. TROUBLESHOOTING. TROUBL SHOOTING
(TABLE 5-3) IPARAGRAPH 5-71)
[PARAGRAPH 5-76)
[SATISFACTORY REPAIR REPAIR REPAIR
COMPLETED COMPLETED COMPLETED
Y
|
ADJUSTMENT AND
CALIBRATION.
(PARAGRAPH 5-88)
Ww
PERFORMANCE TEST.
(PARAGRAPH 5-53
Figure 5-17. Trouble isolation and Troubleshooting Procedure, Overall Scheme
2. Ensure that the MODE and RANGE switches : proper rating; 1A for 115Vac or 0.5A
are in the desired position. for 230Vac.
3. Check the line fuse. If the line fuse is open,
proceed as follows: b. Check the following:
a. Ensure that the proper ac input (115 | On chassis check for short circuits — Main
or 230Vac] is selected {slide switch on power transformer T1 and filter capaci-
power module) and install a fuse of tors C1, C2, and C3.
5-14
On board A1 check for short circuits — АН
filter capacitors and rectifier diodes. Also, |
check for shorts across power tracks on
board.
On board A3 check for short or open cir-
cuits — A3C11, 012-019 (shorted)
A3CRI4-CR17 (opened)
On heat sink assembly — Check output
power transistors.
4, Check that the LOCAL/AUTO switch on board
AZ is in the LOCAL position {see Figure 3-8). For normal
operation of the BPS/A, this switch must be left in the
LOCAL position, The AUTO position is used only for auto-
series, euto-paraile! operation (see Section II).
5. Check continuity of ribbon cables W1 and W2
from the A1 board to the heat sink assembly and rear term-
inal strips respectively,
6. Check for defective meter(s), power cord; and ..
loosely connected circuit boards. Visually inspect circuit
boards for mechanical damage and discolored or charred
components.
7. Hf steps {1) through (6) have not isolated the
trouble, check the supply voltages (Paragraph 5-67).
5-67 Supply Voltage Checks. In almost all cases, the
trouble can be caused by an incorrect supply voltage (main,
bias, or reference voltage); thus, it is a good practice to
check these voltages (see Table 5-2). Although isolation of
the trouble source to a particular board is desireable, poss-
ible trouble in one of the internal power sources should be
investigated first. The tests described in Table 5-2 consti.
tute a relatively fast check for trouble in this area. In many
cases, these checks can save many hours of troubleshooting
circuits which are actually operating properly. If the sup-
ply voltage checks have not isolated the trouble, proceed
according to the overall trouble isolation guide {Paragraph
5-68),
NOTE
There are two separate supply voltage re-
turns in the BPS/A designated (J) and
(6) in addition to chassis ground <=
When making voltage or waveform meas-
urements, be sure to use the appropriate
return. The DVM or oscilloscope used
must have a floating input since the (D
and (2) returns are not at chassis ground,
Tabie 5-2. Main Supply, Bios Supply, end Reference Voitages
COMMON POSITIVE NORMAL READING CHECK IF NOT CORRECT
Main Supply Voltages
(D TP1 +35 + 1.5Vde A1C7, C9, C10, CR12, CR13, RS
TP2 (D ~35 + 1.5Vde A1C11,C12,C15, CR14, CR15, R6
0 ТРЗ +45 + 2Vdc A1CS, C6, C8, CR10, CR11
TP4 (D —45 + 2Vdc А1С13, С14, С16, СЯ16, CR17
Bias Supply Voltages |
2 TP5 + +15 + BVdc A1C3, C17, CR3, CR5,CR6, 01, 02, УВ1
TP6 © —15 + BVdc A1C4, C18, CR7, CR8, 03, 04, VR3
e TP7 +20 + 2Vdc (until) A1CR1, CR2
@ TPS +20 + 2Vdc (fil) A1CRS, CR6, C3
Reference Voltages
-$ TP9 +6.2 + 35Vdc A2VR4
TP10 —$ —6.2 + .35Vdc A2VR3
—OUT TP11 +6.2 + ‚35Vdc A2VR2
TP12 —OUT —6.2 + 35Vde A2VR1
NOTE: Test points 1 through 8 are shown on sheet 1 and test points 8 through 12 are shown on sheet 2 of schematic,
{All voltages specified at nominal! line.)
5-15
5-68 Overall Trouble Isolation Guide. After checking
the supply voltages, disconnect the load and examine Table
5-3. This table contains a list of symptons and probable
causes that may cut down on troubleshooting time. For
each trouble symptom, Table B-3 isolates the trouble to a
component or group of components or directs the reader to
additional procedures if further isolation of the trouble is
necessary,
5-65 Ingeneral, if the BPS/A operates properly in the
power supply mode, it should also operate properly in the
amplifier mode (variable gain or fixed gain amplifier mode).
The trouble symptoms listed in Table 5-3 isolate the troubie
to defective components or groups of components (function-
al circuit areas). The voltage control stages on board A? in
conjunction with the output power amplifier stages on
board A3 and the heat sink assembly provide the desired
output voltage/gain, The voltage control stages A2U1 and
A2U2 are common to both positive and negative outputs.
The bipolar amplifier circuits on board A3 and the bipolar
series regulator/output amplifier stages on the heat sink
assembly consist of positive and negative stages for positive
and negative outputs respectively. The current control cir-
cuits consist of positive current comparison stage (A2U3)
and negative current comparison stage {A2U4) and associ-
ated common circuits consisting of dual ganged CURRENT
contro! ABR1, speedup network (AZQ1, C9}, and current
sampling resistor A2R27, The CURRENT MODE indicator
ABDS2 lights and a FLAG indication is present (high level
at terminal A17) when the BPS/A is in constant current op-
eration. During constant current operation, stages A2Q5 or
A206 provide the proper level to control the CURRENT
MODE lamp driver (A2Q2, Q3) and FLAG output driver
(A2Q4) stages for positive or negative output current respec-
tively. |
Table 5-3, Overall Trouble Isolation Guide
SYMPTOM
PROBABLE CAUSE
No output voltage (Al modes:
POWER SUPPLY, VAR GAIN b
AMP, FXD GAIN AMP)
a. Fuse blown or incorrect rear terminal strip strapping, etc. {see Paragraph 5-66).
. Main, bias, or reference voltages defective {see Paragraph 5-67).
¢. Relay A1K1, circuit board {A2 or A3), or output power transistors on heat
sink assembly defective {see Paragraph 5-70).
Zero or low output voltage
(POWER SUPPLY mode only)
a. MODE switch defective
b. Internal positive dc reference defective {A2C10, R3, R58, R59}
(POWER SUPPLY and VAR
GAIN AMP modes only).
5-71).
Zero or low output voltage a. Voltage reference/gain control amplifier stage A2U2 defective (see Paragraph
b. VOLTAGE control ABR? defective.
No output (VAR GAIN AMP and
FXD GAIN AMP modes only). b
a. MODE switch not in proper position.
. improper connections to rear terminals A1 and A2 or front panel terminalis
Hi IN and LO IN.
Output voltage correct in X4
a. RANGE switch defective.
or low positive output.
range, but incorrect in X1 range b. Relays A2K2 and/or A2K3 defective.
or vice versa.
Negative output normal but zero a. Check the main positive supply voltages {see Tabie 5-2): +35V, +45V
b. Positive turn on/off circuit defective {A2Q2 shorted).
c. Defective positive output power transistor stage on heat sink assembly: Q1
or Q2 defective.
d. Defective positive coupling amplifier or driver stages on A3 board:
A306, 07, 08 (opened), VR? (shorted)
mum positive.
Output voltage latched to maxi- a. Amplifier stage on A3 board defective, A306 shorted.
b. Positive current comparison amplifier output diode (A2CR 14) shorted.
5-16
Tabvie 5-3. Overall Trouble Isolation Guide (Continued)
SYMPTOM
PROBABLE CAUSE
Positive output normal, but zero
or low negative output.
a. Check the main negative supply voltages (see Table 5-2): —35V, —45V.
b. Negative turn on/off circuit defective (A2Q3 shorted).
с. Defective negative output power transistor on heat sink assembly: Q3 or 04
defective, |
d. Defective negative coupling amplifier or driver stages on A3 board:
A308, 010, Q11 (opened), VR1 (shorted)
Output voltage latched to maxi-
mum negative,
a. Amplifier stage on A3 board defective. A3Q11 shorted.
b. Negative current comparison amplifier output diode (A2CR 13) shorted.
No constant current operation,
a. Check reference voltages at TP11 and TP12 and bias voltage: at TP5 and TP&
{see Table 5-2).
b. Check circuit components common to positive {A2U3) and negative (A2U4)
comparison amplifiers:
Dual ganged CURRENT control — АБВ?
Speed up network — À2C9, Qt, R27, R46, R47
No positive constant current op-
eration {negative constant current
circuits operate properiyl.
a. Check positive reference voltage at TP11 {see Table 5-2).
b. Positive current comparison amplifier A2U3 defective (see Paragraph 5-71).
с. A2CR5, CR14, or VRS defective,
No negative constant current
operation {positive constant cur-
rent circuits operate properly).
a. Check negative reference voltage at TP12 (see Table 5-2).
b. Negative current comparison amplifier A2U4 defective {see Paragraph 5-71}.
¢. A2CR13 or VRB defective,
Positive constant current circuits PNP switch A205 opened.
operate properly but CURRENT
MODE indicator does not light.
Negative constant current cir- NPN switch A206 opened.
cuits operate properiy but
CURRENT MODE indicator
does not light.
CURRENT MODE indicator
always on (FLAG output low).
Defective lamp driver circuit: A202 opened or A203 shorted.
FLAG output (terminal A17) FLAG driver A204 opened.
always high (about +16V).
CURRENT MODE indicator Diode A2CR 10 opened.
always on and FLAG output
always high.
Constant current circuits operate
normally but CURRENT MODE
indicator does not light.
a. Indicator {LED) ABDS2 defective.
b. Defective lamp driver circuit: A2Q2 shorted or A203 opened.
517
Table 5-3. Overall Trouble Isolation Guide {Continued)
SYMPTOM
PROBABLE CAUSE
Constant current circuits operate
normally but no FLAG output
{always low).
a. FLAG driver A204 shorted.
b. Jumper A2W1 not installed,
Positive current sink inoperative.
A2CR3, CR11, CR12 or R28 defective.
Negative current sink inopera-
A2CR4, CR7, CR8 or R29 defective.
tive,
Bandwidth too narrow in VAR A201 defective.
GAIN AMP mode.
5-70 Board Isolation Procedure. The board isolation pro- VOLTAGE METER: high range DC
cedure describes how to isolate trouble to the turn on/off
circuit on boards At and A3, the voitage/current control
circuits on board AZ, or to the output power amplifier
stages on board A3 and the heat sink assembly. The board
isolation procedures assumes that an output problem exists
in ali three modes of operation and alf trouble isolation pro-
cedures up to this point have been completed. To isolate
the trouble to the defective boardís), proceed as follows:
WARNING
The following troubleshooting procedures
are performed with power applied to the
BPS/A while its protective covers are re-
moved. Be careful when performing the
procedures as line voltage is always pres-
ent on the power input connector, fuse
holder, and in the power supply rectifier
circuits. In addition, when the supply is
on, energy available at many points, par-
ticularly the power transistors on the rear
heat sink, may result in personal injury or
death when contacted,
a. Remove covers and A3 board from the instru-
ment,
b. Remove load and connect 8 DVM to the +5
and —$ rear terminals,
с. Set controls on front panel as follows:
MODE switch: POWER SUPPLY
RANGE switch: X4
VOLTAGE control: fully clockwise
CURRENT control: fully clockwise
5-18
CURRENT METER: high range DC
d. Turn on power and observe that LINE indica-
tor lights,
e. Check that turn on/off relay A1K1 is operating
properly by connecting chmmeter between A1K1 pin 1 and
2) . Ohmmeter should indicate an open circuit. if a
short circuit (zero ohms) is present, check relay A1K1 and
associated components (A102, CR4, R32, R37}. If open
circuit is present, proceed to step {f}.
f. Turn off power and isolate the turn on/off cir- 5
cuit on board A3 by lifting the connections from diodes
A3CR3 and A3CR4 to the collectors of transistors A3Q2
and A3Q3 respectively. Install A3 board in instrument.
g. Turn on power. if output voltage is normal
(max. positive), the turn on/off circuit (A301-A305) is
defective, If output is zero or low, proceed to step (h).
h. Turn off power and reconnect diodes A3CR3
and A3CR4. Connect —5Yde to the A1 (HI IN) and A?
(LO IN) terminals.
i. Set MODE switch to FXD GAIN AMP position
and turn on power. If output voltage is normal (max. posi-
tive), the voltage/gain reference stage A2U2 is probably de-
fective [see Paragraph 5-71). 1f output is zero, proceed to
step {j).
j}. Turn power off. Remove the A2 board. Con-
nect a variable dc voltage source (—2,5V to —4.5V} betwsen
A3 pin Band (2) . Connect negative potential to A3
pin 5.
k. Turn on power and vary the negative source
voltage from —2.5V to —4.5V. Output voltage should vary
accordingly from maximum positive to maximum negative
value through zero. If output voltage is normal, the A2
board is defective {see Paragraph 5-71). If output is not
normal, the A3 board or output power transistor stages on
heat sink assembly are defective (see Paragraph 5-76).
5-71 A2 BOARD TROUBLESHOOTING
NOTE
For normal operation of the BPS/A, the Local/
Auto switch A2ST must be in the “Local” роз
tion {ses Figure 3-8). The “Auto” position is
used only for auto-series, auto-parallel, or auto-
tracking operation (see Section HI). If this
switch is left in the “Auto” position for normal
operation, the output will be fatched at fui!
positive or negative depending on other control
settings.
5-72 The A2 plug-in board contains the voltage and cur-
rent control circuits which can be separated functionally
allowing the trouble to be isolated to the individual circuit
level. The following paragraphs provide troubleshooting
procedures for the voltage control, current control, and
RMS current meter driver circuits located on board A2.
5-73 Voltage Control Circuits. Integrated circuit ampli
fies A2U1 {voltage comparison amplifier} and A2U2 (voit-
age reference/gain control amplifier) with their circuit com-
ponents are part of the constant voltage feedback loop. The
following procedure consists of a series of fast checks to iso-
late trouble in these circuits.
a. Remove top and right side covers from instru-
ment. Remove the A3 hoard.
b. Ensure that rear terminal strip is strapped cor-
rectly for local operation {see Section ii).
c. Set front pane! controls as follows:
MODE switch: POWER SUPPLY
RANGE switch: X1
VOLTAGE control: fully counterciockwise
CURRENT control: fully clockwise
d. Connect a DVM between A2UZ pin 6 (TP14)
and ~8,
e. Turn VOLTAGE control through its range and
observe that DVM reading varies from 0 to —10V. 1f voit-
age reading is correct, proceed to step {f). if the output at
pin 6 is t15V, check A2CR1, CR2, U2 for short circuits. if
the output at pin 6 is zero, VOLTAGE control ABRZ is
open or defective, or A2U2 is defective.
f. Set VOLTAGE control for reading of —5V on
DVM,
g. Set MODE switch to VAR GAIN AMP positive
and connect oscilloscope between A2U1 pin 6 (TP13) and —S.
h. Apply a 100Hz sinewave (about 40mV р-р) 10
the H1 IN tA1) and LO IN {A2} terminals. 1f AZUT is oper-
ational, a sinewave {approximately 8V p-p} should be ob-
served on oscilloscope. If there is no output, AZUT or
A2K1 is defective. If the output at A2U1 pin 6 is +15Vde,
AZ2CR18, CR19, or A2U1 is shorted.
5-19
5.74 Current Control Circuits. Integrated circuit ampli-
fiers A2U3 {positive current comparison amplifier} and
— A2U4 (negative current comparison amplifier} control con-
stant current operation for positive and negative output
currents respectively, An “OR function results if either
circuit is operational and control is established. To check
these circuits proceed as follows:
a. Remove top and right side covers from instru-
ment. Remove the À3 board.
b. Remove strap between terminals A13 and A14,
and apply a small variable de voltage (approximately 10.2
Vdc} between terminais A14 and A18.
с. Connect a DVM between A2U3 pin 6 (TP16)
and —S. Turn on power and note that DVM reads from
approximately +7V to -8V as the source voltage is varied
through zero. if voltage reading is correct, proceed to step
(d). 11 reading is £15V, check A2U3 for short. if reading
is zero, A2U3 is defective.
d. Turn power off and replace straps between
terminals A13 and A14. Remove straps between terminals
A20 and A21. Apply a small variable dc voltage {approxi
mately +0.2Vdc) between terminals A21 and A1B,
e. Connect a DVM between A2U4 pin 6 (TP17]
and —S. Turn on power and note the DVM reads approxi-
mately +7V to —BV as the source voltage is varied through
zero. If reading is not correct, the A2U4 stage is defective,
5.75 RMS Current Meter Driver. Integrated circuit
A2U5 provides the gain necessary to drive diode detector
A1CR 18 which allows ac current to be metered through
the detection process. To determine if A2US is operational,
apply a sinewave {2V p-p, 100Hz) with a dc offset of —0.2
Vdc to the OUT side of A2C13. Observe that a sinewave
of approximately 28-30V p-p is present at pin 6 of A2U5.
Connect ascilloscope between A2US pin 6 and 00 for
this measurement,
5.76 A3 BOARD AND HEAT SINK ASSEMBLY
TROUBLESHOOTING
WARNING
The following troubleshooting procedures
are performed with power applied to the
BPS/A while its protective covers are re-
moved. Be careful when performing the
procedures as line voltage is always pres-
ent on the power input connector, fuse
holder, and in the power supply rectifier
circuits. In addition, when the supply is
on, energy available at many points, par-
ticularly the power transistors on the rear
heat sink, may result in personal injury or
death when contacted.
5-77 The A3 plug-in board contains positive and negative
amplifier and driver stages which amplify the contro! voltage
from bosrd A2 in order to control the conduction of the
output power transistors on the heat sink assembly, The A3
board and heat sink assembly stages can be isolated from the
voltage and current feedback ioops by removing the A2
board from the instrument and providing an external con-
trol voltage input to the A3 board. The following paragraphs
describe troubleshooting procedures for the A3 board and
heat sink assembly circuits.
5-78 Output Amplifier Stages. To troubleshoot the am-
piifier and driver stages on the A3 board and the output
power transistors on the heat sink assembly, proceed as fol-
OWS
a. Remove the AZ board from the unit and remove
the load from the output terminals,
b. Connect function generator (HP3310A) output
terminals between the connector side of A3R15 and (2).
Set output of function generator for a sinewave of approxi-
mately 2V p-p at 100Hz with a dc offset of —3.5V. Connect
an oscilioscope to +S and ~8 terminals.
c. Turn on power and observe & sinewave output
of 40V p-p. The sinewave should not be clipped or distorted.
d. If either polarity of the sinewave is missing or
distorted, troubleshoot by tracing the sinewave back to the
source. Refer to Figure 7-2 {Sheet 1}. Also, check the turn
on/off circuit (Paragraph 5-79).
NOTE
When troubleshooting the power amplifier cir-
cuits, keep in mind that possible trouble areas
exist in the interconnections (A 1 board, Wi,
and W2 ribbon cables} as well as the A3 board
circuits and the output power transistors 01.
Q4 on the heat sink assembly.
5-20
5-78 Turn On/Off Circuit. The turn on/off circuit on
board A3 can be isolated from the main amplifier driver cir-
cuits by disconnecting A3CR3 and/or A3CRA, if the trouble
is in the turn on/off circuit, the output should rise to the |
proper level with the diodels} disconnected. To check the
operation of the turn on/off circuit (diodes A3CR3, CR4,
are connected), short the base of A301 to (2) ‚and the
sinewave output will drop to ‚5V p-p. When the short is
removed, the output will return to the full sinewave output.
5-80 Quervoltage Protection Circuit. The overvoltage
protection clamping diodes are another potential trouble
area. Diodes A3VR1 and VR2 can be lifted (disconnected)
individually or together while observing the amplifier out-
put. |f one or more are shorted, the complete sinewave will
be restored when the defective diode is disconnected.
5-81 Overcurrent Protection Circuit. Protection against
overcurrent during the transition from constant voltage to
Constant current operation is provided by diode A3CR22
on the negative output and diodes A3CR20 and CR21 on the
positive output. If these diodes are defective, the output
wiil be badly clipped or the output level will be much lower
than normal,
5-82 DEGRADED PERFORMANCE PROBLEMS
5-83 Table 5-4 contains a list of less common troubles
and their probable causes. The troubles in this table are
less catastrophic than those previously described in that,
generally, they lead to degraded performance rather than
complete failure.
| Table 5-4, Degraded Performance Probiems
SYMPTOM
PROBABLE CAUSE
Poor constant voltage line
regulation,
Bias and reference supply: Check A101-04, A1VR1, A2VR3, A2VR4
Poor constant current line
regulation.
Bias and reference supply: Check A1Q1-Q4, ATVR1, A2VR1, A2VR2
amplifier modes.
Poor constant voltage load a. Constant current operation taking place: Check setting of CURRENT control,
regulation. b. A2U1, A2U2 defective.
c. Check measurement technique.
Poor constant current load a. CURRENT control set too low.
regulation. b. A2U3, A2U4 defective.
c. Check measurement technique.
High ripple. a. Ground loop through test equipment, check test setup.
b. Excessive ripple in reference voltages. Check reference voltages (Table 5-2).
¢. Supply crossing over into constant current operation, check setting of
CURRENT control {may be set too close to crossover point).
d. Defective rectifier circuits (half wave instead of full wave rectification).
Excessive distortion in a. Supply crossing over into constant current operation. Check setting of
CURRENT control,
b. Defective component in amplifier circuit. Check A3CR14-CR17, R28, R30.
5-84 REPAIR AND REPLACEMENT
5-85 Section VI of this manual contains a list of replace-
able parts. Tabie 5-5 contains replacement data for the semi
conductors used in the BPS/A described by this manual.
When replacing a semiconductor, use a Hewlett-Packard
part or a commercial replacement part, if applicable. in
cases where neither of these parts are immediatley available
and a part is needed for emergency operation or trouble-
shooting verification, the alternate part {see Table 5-5) can
be tried with at least 3 90% probability of success,
5-86 COVERS AND FRONT PANEL
5-87 Top or Bottom Cover. To remove either the top or
bottom cover:
a. Turn off unit.
b. Remove two, %-inch, No.6 setf-tapping flat-head
screws at rear of cover.
c. Slide cover toward rear of unit approximately
3/4 inches and lift out of unit.
5-88 Side Cover. To remove either side Cover, remove
four, 1/4-inch, No. 6 fiat-head screws and lift cover off.
5-21
5.89 Side Castings. To remove either side casting:
a. Remove top, bottom, and side cover.
b. Remove eight, No. 6 flat-head screws securing
side casting to instrument cross members.
c. Lift side casting off,
5-90 Front Panel. To remove the front panei:
a. Remove top, bottom, side covers, and left side
casting.
b. Loosen the VOLTAGE METER and CURRENT
METER knobs with allen wrench and remove knobs.
с. Front pane! may now be pulled forward away
from front of unit.
5-91 Foot Assemblies and Tilt Stand. The front and
rear foot assemblies and the tilt stand on the bottom of the
unit must be removed before the unit is rack mounted {see
Paragraph 2-15). To remove these assemblies, proceed as
follows:
a. Remove the rear foot assembly on bottom of the
unit by pushing the release button in the center of the foot
assembly and sliding the assembly OFF as indicated.
b. Remove bottom cover {Paragraph 5-87). The
bottom cover is removed to gain access to the A1 board.
Table 5-5. Semiconductor Replacement Dats
Reference Designation HP Part No. Commercial Replacement Alternative
01-04 1854-0264 23715
A1CR1-CR4; A3CR1-CR7: A2CR1, CR2, CRS,
CR10, CR13, CR14, CR18-CR24; A3CR15-CR17, 1901-0050 1N4148
A3CR19-CR21
A1CRS5-CR8 1901-0327 1N5059
A1CR10, CR11, CR16, CR17 1901-0328 1N5060
A1CR12-CR15 1901-0416 1N4999
A1CR18 1901-0535 | —————
A1CR20 1901-0518 | mm
A101 1853-0041 2N4036
A1Q2, A201, Q2, Q3, dea, Q6; A301, 04, 06 1854-0071 | —-—-——— 284141
A103 1854-0244 2N1711A
A104; A205 18530099 | — — — — -— 2№2907
A1VR1, VR3; А2У А 1-5 1902-1221 14825
A2CR3, CRA, CR7, CRS, CR11, CR12 1901-0033 1N485
A2CR9, A3CR14 1901-0460 1N4157
A2U1-U5 1820-0223 LM301AH National
A2VR6, VRS 1902-0064 SZ10939-145 Motorola
A3CR22 19010518 | ————
A302, 07, 010-012, 014-016 1854-0095 40346 RCA
АЗОЗ, Об, Q13, Q17, Q18, Q19 1853-0038 SJ5099 Motorola
A308, Q9 1853-0037
NOTE 5.92
The release button on the front foot assembly is
located directly beneath the —1 ZERO ADJ ро!-
entiometer on board Al. By pressing slightly in-
ward on the A1 board, sufficient clearance is pro-
vided to remove the front foot assembly.
¢. Remove the front foot assembly as in step (a)
except also apply slight inward pressure to the A1 board.
d. Remove one of the side castings (Paragraph
5-89) to allow removal of the tilt stand.
e. Remove tilt stand.
f. Replace bottom cover if the unit is to be rack
mounted.
522
REAR HEAT SINK ASSEMBL Y
5-93 In order to remove the power transistors from the
heat sink, the rear panels must first be removed. After the
rear panels are removed, the transistors are exposed and can
be removed. Notice that if a new power transistor is in-
stalied, be sure to apply silicon grease {Dow DC-5, HP 8500-
0053) to both sides of the transistor’s mica insulator to
assure proper heat exchange.
5-94 Rear Panels. To remove the rear pane! containing
the rear terminal boards and the panel containing the power
receptacle, proceed as described below.
5-95 Terminal Board Panel.
a. Remove top cover {Paragraph 5-87).
by. Remove two screws at top Of unit (near Service
tag).
c. Remove cable W2 from connector J4 on board
A.
d. Lift the terminal board panel straight up and
out,
5-96 Power Receptacle Panel.
a. Remove bottom cover {Paragraph 5-87).
b. Remove two screws securing corner of panel,
¢. Lift panel straight up and out.
5.87 Heat Sink. To remove the heat sink, proceed as
follows:
a. Remove ai! covers {Paragraph 5-86).
b. Remove terminal board and power receptacle
rear panels {see above}.
c. Remove four screws securing heat sink to side
frames,
d. Remove cable W1 from connector J3 on board
A1, The heat sink can now be lifted out.
5-98 ADJUSTMENT AND CALIBRATION
5-99 Adjustment and calibration may be required after
performance testing, troubleshooting, or repair and replace-
ment.
5-100 METER ZERO
5.101 The meter pointer must rest on the zero calibration
mark on the meter scale when the instrument is at normal
operating temperature, resting in its normal operating post
tion, and turned off. To zero set the voltmeter and ammeter,
proceed as follows:
a. Turn on instrument and allow it to come up to
normal operating temperature (about 30 minutes).
b. Turn instrument off. Wait one minute for power
suppiy capacitors to discharge completely.
e. Insert sharp pointed object {pen point or awl)
into small indentation near top of round black plastic disc
located directly below meter face.
d. Rotate plastic disc clockwise until meter reads
zero, then rotate counterclockwise slightly in order to free
adjustment screw from meter suspension. Pointer should
not move during latter part of adjustment,
5.102 CONSTANT VOLTAGE CALIBRATION
NOTE
The CURRENT MODE light should be off dur-
ing these procedures.
5-23
5.103 Output Zero and Offset Adjustments,
a. Remove top cover to gain access to potentio-
meters on boards A1 and A2.
b. Connect DVM to the +8 and —S rear terminals.
c. Short BPS/A front panel input terminalis {FH} IN
to LO IN). Output terminais HI! OUT (+) and LO QUT {--}
are open circuited,
d. Set MODE switch to FXD GAIN AMP position.
Turn CURRENT control fully clockwise,
e. Turn on BPS/A and allow a 10-minute warmup.
f. While switching the RANGE switch between the
X1 and X4 positions, adjust A2R60 until the X4 reading on
DVM is of the same polarity and 4 times the X1 reading
within 2.5mV. For example, if X1 reading is +.1mV, adjust
A2R60 for +2.9mV or less.
g. Set RANGE switch to X1 and adjust A2R61
for 0V +0.25mV reading on DVM.
kh, Set RANGE switch to X4, DVM should read
OV +1.0mV. 1f not, repeat steps (f) through (g).
i. Remove short from Hl and LO IN terminais.
5.104 Constant Voltage Programming Accuracy.
a. Set MODE switch to POWER SUPPLY position
and RANGE switch to X1 position.
b. Short terminals AS and A10 on rear terminal
strip.
¢. Adjust potentiometers A2R58 {coarse} and
A2R59 (fine) for a DVM reading of —5.120V +.2mV.
d. Turn BPS/A off. Remove jumper between
terminais AS and A9 and connect a precision 10.24 K82
{+.05%) resistor between terminals A9 and A10.
e. Turn BPS/A on and adjust front panel V ZERO
ADJA1R1 for OV + .2mY.
f. Set RANGE switch to X4 position. DVM should
read OV +.8mV. If not, check A2R60 adjustment (step f of
Paragraph 5-103).
g. Turn BPS/A off. Remove 10.24K1? resistor and
connect a 20.48K $2 {£0.05%) resistor between terminals AY
and AO.
h. Turn BPS/A on. DVM should read +20.48V +
10mY.
6.105 DC Voltmeter Calibration,
a. Set VOLTAGE METER switch to the 24V DC
position,
b. Adjust A1R8 for +20.4BV indication on BPS/A’s
front panel voltrneter.
- © Connect short across 20.48K£2 (+0,05%) resistor
{A9 to A10). Front panel voitmeter should read —20.48V.
d. Turn BPS/A off, remove 20.48K resistor, install
jumper between AB and A9, remove DVM from output ter-
minats, and replace top cover,
5-106 CONSTANT CURRENT CALIBRATION
NOTE
The CURRENT MODE light should be on dur-
ing these procedures.
5-107 Constant Current Programming Accuracy.
a. Remove top cover to gain access to potentio-
meters on boards A and AZ,
b. Remove jumpers from A19 to A20 and from
A12 10 A13 on rear terminal strip.
e. Short terminals A18 and A13 and A18 10 A20
on rear terminal strip.
d. Connect a 157 .1% precision resistor (Rs) in
series with the appropriate high range joad resistor {Ry J,
4957 (6826A) or 1990 (6827A) as shown in Figure 5-16.
Connect the DVM across the 10 resistor.
e. Turn on BPS/A and allow a 30-minute warmup.
f. Set MODE switch to POWER SUPPLY. Set the
RANGE switch to X10 and turn the VOLTAGE control
fully clockwise.
g. Adjust front panel +! ZERO ADJ 1A1R2) for
8 reading of 0.000 + .3mV on DVM.
h. Turn VOLTAGE control fully counterclockwise.
i. Adjust front panel -— 1 ZERO ADJ (ATR3) fora
reading of 0.000 + .3mV on DVM.
NOTE
The A1R2 and A1R3 adjustments may interact.
Repeat steps (f) through (1) several times to min-
imize errors.
j Turn BPS/A off and remove jumper from A18
to A20. Connect a precision 10.24K (£0.5%) resistor be-
tween A18 and A20.
k. Turn VOLTAGE control fully counterclockwise
and turn on the BPS/A.
1. Adjust A2R21 for —2.048V +.5mV as indicated
on DVM.
m. Turn BPS/A off and remove the iumper between
A18 and A13. Connect a precision 10.24K {£0.5%) resistor
between A18 and A13.
n. Turn VOLTAGE control fully clockwise and
turn on the BPS/A.
5-24
0. Adjust AZR19 for +2.048V +5mV as indicated
on DVM,
5-108 DC Ammeter Calibration.
a. Set the CURRENT METER switch to the 2.4A
DC position.
b. Adjust A1R20 for a front pane! ammeter indica
tion of 2.0A,
c. Turn off BPS/A. Remove the 10.24K{) resistors,
replace jumpers from A20 to A21 and from A13 to A14.
Ensure that jumpers are also connected from A12 to A13
and from A19 to A21. Replace top cover.
5-109 AC METER CALIBRATION
5-110 AC Voltmeter Calibration. |
a. Remove top cover to gain access to potentio-
meters on board A1,
b. Connect test setup as shown in Figure 5-16 with
high range load resistor {R; ) connected in series with 12
resistor (Re) across + and — output terminals. Set function
generator for a 5 volt 100Hz squerewave output.
с. Set BPS/A front panel controls as follows:
MODE switch; FXD GAIN AMP
RANGE switch: X4
VOLTAGE control: May be left in any posi-
tion for this procedure.
CURRENT control: fully clockwise
VOLTAGE METER:16V АС
CURRENT METER:1.6A AC
d. Turn on BPS/A and allow a 10-minute warmup.
e. Connect oscilloscope to +S and ~S terminals
and observe waveform for overshoot and ringing.
f. Remove oscilloscope and connect DVM to +5
and -S terminals,
g. Adjust the function generator output leve! for
a DVM reading of 14.1 20.2V rms.
h. Adjust ATR13 for 14.1V rms on BPS/A front
pane! voltmeter.
5-111 AC Ammeter Calibration.
9. Connect DVM across the 10 resistor.
b. Adjust function generator output level for a
DVM reading of 1.414 +.06Y rms,
c. Adjust A1R 18 for 1.4A rms on BPS/A front
panel ammeter,
SECTION VI
REPLACEABLE PARTS
6-1 INTRODUCTION
6-2 This section contains information for ordering re-
placement parts. Table 6-4 lists parts in alpha-numeric order
by reference designators and provides the following informa:
tion:
a. Reference Designators. Refer to Table 6-1.
b. Description. Refer to Table 6-2 for abreviations.
e. Total Quantity {TQ}. Given only the first time
the part number is listed except in instruments containing
many sub-moduiar assemblies, in which case the TQ appears
the first time the part number is listed in each assembly.
de Manufacturer's Part Number or Type.
¢. Manufacturer's Federal Supply Code Number,
Refer to Table 6-3 for manufacturer's name and address.
f. Hewlett-Packard Part Number.
g. Recommended Spare Parts Quantity (RS) for
complete maintenance of one instrument during one year of
isolated service.
h. Parts not identified by a reference designator
are listed at the end of Table 6-4 under Mechanical and/or
Miscellaneous. The former consists of parts belonging to and
grouped by individual assemblies; the latter consists of all
parts not immediately associated with an assembly.
6-3 ORDERING INFORMATION
6-4 To order a replacement part, address order or in-
quiry to your loca! Hewlett-Packard sales office (see lists at
rear of this manual for addresses). Specify the following
information for each part: Model, compiete serial number,
and any Option or special modification (J) numbers of the
instrument; Hewlett-Packard part number; circuit reference
designator; and description. Te order a part not listed in
Table 6-4, give a complete description of the part, ¡ts func-
tion, and its location.
Table 6-1. Reference Designators
A =assembiy E = miscellaneous
8 = blower {fan} electronic part
С = capacitor F = fuse
СВ = circuit breaker J = jack, jumper
CR = diode K = relay
DS = device, signaling L = inductor
(amp) M = meter
6-1
Table 6-1. Reference Designators (Continued)
= plug
= transistor
= resistor
= switch
= transformer
= terminal block
TS = thermal switch
— A Ще
A 30
\ = vacuum tube,
neon buib,
photocell, etc.
VR = zener diode
X =socket
Z = integrated cir
cuit or network
Table 6-2. Description Abbreviations
A = ampere
ac = alternating current
assy. = assembly
bd = board
bkt = bracket
OC = degree Centigrade
cd = card
coef = coefficient
comp = composition
CRT = cathode-ray tube
CT = center-tapped
de = direct current
DPD T= double pole,
double throw
DPST = double pole,
single throw
elect = electrolytic
encap= encapsulated
F = farad
OF = degree Farenheit
fxd = fixed
Ge = germanium
H = Henry
Hz = Hertz
IC = Integrated circuit
D = inside diameter
inend = incandescent
k =kilo= 105
m = milli= 10°
M . =mega=_10°
u = micro = 10
met. = metal
mfr = manufacturer
mod. = modular or
modified
mtg = mounting
n = nano = 10
NC = normaliy closed
NO = normally open
NP = pickel-plated
{2 = ohm
obd = order by
description
OD = outside diameter
p = pico = 10°! 2
PC. = printed circuit
pot. = potentiometer
pp = peak-to-peak
ppm = parts per million
руг = peak reverse
voltage
rect = rectifier
rms = root mean square
Si =silicon
SPOT = single pole,
double throw
SPST = single pole,
single throw
55 =smail signal
T = slow-blow
tan. = tantuium
Ti = titanium
\ = volt
var = variable
ww = wirewound
W = Watt
Table 6-3. Code List of Manufacturers
CODE MANUFACTURER ADDRESS
00629 EBY Sales Co., Inc. Jamaica, N.Y.
00656 Aerovox Corp. New Bedford, Mass.
00853 Sangamo Electric Co.
S. Carolina Div. Pickens, S.C.
01121 Allen Bradley Co. Milwaukee, Wis.
01255 Litton Ind, Beverly Hills, Calif.
01281 TRW Semiconductors, Inc.
Lawndale, Calif.
01295 Texas Instruments, inc. Dallas, Texas
01586 RCL Electronics, inc. Manchester, N.H.
01930 Amerock Corp. Rockford, Hl,
02107 Sparta Mfg. Co. Dover, Ohio
02114 Ferroxcube Corp. Saugerties, N.Y.
02606 Fenwal Laboratories Morton Grove, Hl.
02660 Amphenol Corp. Broadview, IH.
02735 Radio Corp. of America, Solid State and
Receiving Tube Div. Somerville, N.J.
03508 G.E. Semiconductor Products Dept.
Syracuse, N.Y.
03797 Eldema Corp. Compton, Calif,
03877 Trensitron Electronic Corp.
Wakefield, Mass.
03888 Pyrofilm Resistor Co., Inc.
Cedar Knolls, N.J,
04009 Arrow, Hart and Hegeman Electric Co,
| Hartford, Conn,
04072 ADC Electronics, Inc. Harbor City, Calif.
04213 Caddell & Burns Mfg. Co. Inc.
Mineola, N.Y.
04404 "Hewlett-Packard Co. Palo Alto Div.
Palo Alto, Calif.
04713 Motorola Semiconductor Prod. Inc.
Phoenix, Arizona
05277 Westinghouse Electric Corp.
Semiconductor Dept. Youngwood, Pa.
05347 Ultronix, Ine. Grand Junction, Colo.
05820 Wakefield Engr. Inc. Wakefield, Mass.
06001 General Elect. Co. Electronic
Capacitor & Battery Dept. irmo, SC.
06004 Bassik Div. Stewart-Warner Corp.
Bridgeport, Conn.
06486 IRC Div. of TRW Inc.
Semiconductor Plant Lynn, Mass.
06540 Amatom Electronic Hardware Co, Inc.
New Rochelle, N.Y,
06555 Beede Electrical Instrument Co.
Penacook, N.H.
06666 (General Devices Co. Indianapolis, ind.
06751 Semoor Div. Components, Inc.
Phoenix, Arizona
06776 Robinson Nugent, inc.’ New Albany, N.Y.
06812 Torrington Mfg. Co. Van Nuys, Calif.
CODE | MANUFACTURER ADDRESS
07137 Transistor Electronics Corp.
Minneapolis, Minn,
07138 Westinghouse Electric Corp. Eimira, N.Y.
07263 Fairchild Camera and Instrument
Mountain View, Catif.
07387 Birtcher Corp., The — Los Angeles, Calif.
07397 Sylvania Electric Prod. Inc.
Mountainview, Calif.
07718 IRC Div. of TRW Inc. Burlington, lowa
07910 Continental Device Corp,
Hawthorne, Calif.
07933 Raytheon Co. Components Div.
Mountain View, Calif.
08484 Breeze Corporations, inc. Union, N.J,
08530 Reliance Mica Corp. Brooklyn, N.Y,
08717 Sloan Company, The — Sun Valley, Calif,
08730 Vemaline Products Co. inc.
Wyckoff, N.J.
08806 General Elect. Co. Minature
Lamp Dept. Cleveland, Ohio
08863 Nylomatic Corp. Norrisville, Pa.
08919 RCH Suppiy Co. Vernon, Calif,
09021 Airco Speer Electronic Components
Bradford, Pa.
09182 "Hewlett-Packard Co, New Jersey Div.
Rockaway, N.J.
08213 General Elect. Co. Semiconductor
Pred. Dept. Buffalo, N.Y,
09214 Genera! Elect. Co. Semiconductor
Prod. Dept. Auburn, N.Y.
09353 С & К Components inc. Newton, Mass,
09922 Burndy Corp. Norwalk, Conn.
11115 Wagner Electric Corp.
Tung-Sol Div, Bloomfield, N.J.
11236 CTS of Berne, Inc, Berne, Ind,
11237 Chicago Telephone of Cal. Inc.
Se. Pasadena, Calif.
11502 IRC Div. of TRW inc. Boone, N.C.
11711 General instrument Corp. Newark, N.J.
12136 Philadelphia Handle Co. Camden, N...
12615 U.S. Terminals, inc. Cincinnati, Ohio
12617 Hamlin Inc. Lake Mills, Wisconsin
12697 Clarostat Mfg. Co. Inc. Dover, N.H.
13103 Thermalloy Co. Dallas, Texas
14493 "Hewlett-Packard Co. Loveland, Colo.
14655 Cornell-Dubilier Electronics Div.
: Federal Pacific Electric Co.
Newark, N.J.
14936 General Instrument Corp. Semicon-
ductor Prod. Group Hicksville, N.Y.
15801 Fenwal Elect. Framingham, Mass.
16299 Corning Glass Works Raleigh, N.C,
“Use Code 28480 assigned to Hewlett-Packard Co., Palo Alto, California
Table 6-3. Code List of Manufacturers
CODE | MANUFACTURER ADDRESS
16758 Deico Radic Div, of General Motors
Corp. Kokomo, ind.
17545 Atlantic Semiconductors, Inc.
Asbury Park, N.J,
17803 Fairchild Camera and Instrument Corp.
Mountain View, Calif.
17870 Daven Div, Thomas A. Edison industries
McGraw-Edison Co. Orange, N.J.
18324 Signetics Corp. Sunnyvale, Calif.
19315 Bendix Corp. The Navigation and
Control Div. Teterboro, N.J.
19701 Electra/Midiand Corp.
Mineral Wells, Texas
21520 Fansteel Metaliurgical Corp.
No. Chicago, fH.
22229 Union Carbide Corp. Electronics Div.”
Mountain View, Calif.
22753 UID Electronics Corp. Hollywood, Fla,
23936 Pamotor, Inc. Pampa, Texas
24446 General Electric Co. Schenectady, N.Y.
24455 General Electric Co.
Nela Park, Cieveland, Ohio
24655 General Radio Co. West Concord, Mass.
24681 LTV Electrosystems inc. Memcor/Com-
ponents Operations Huntington, Ind.
26982 Dynacool Mfg. Co. Inc. Saugerties, N.Y,
27014 National Semiconductor Corp.
Santa Clara, Calif.
28480 Hewlett-Packard Co. Palo Alto, Calif.
28520 Heyman Mig. Co. Kenilworth, N.J.
28875 IMC Magnetics Corp. Rochester, N.H.
31514. | SAE Advance Packaging, Inc.
Santa Ana, Calif.
31827 Budwig Mfg. Co. Ramona, Calif.
33173 G.E. Co. Tube Dept. Owensboro, Ky.
35434 Lectrohm, Inc. Chicago, HH.
37942 P.R. Mallory & Co. Indianapolis, Ind.
42190 Muter Co. Chicago, Hl.
43334 New Departure-Hyatt Bearings Div.
General Motors Corp.
Sandusky, Ohio
44655 Ohmite Manufacturing Co. Skokie, It.
45384 Penn Engr. and Mfg. Corp.
Doylestown, Pa.
47904 | Polaroid Corp. Cambridge, Mass.
49956 Raytheon Co. Lexington, Mass.
55026 Simpson Electric Co, Div. ot American
Gage and Machine Co. Chicago, 11.
56289 Sprague Electric Co.
North Adams, Mass.
58474 Superior Electric Co. Bristol, Conn.
58849 Syntron Div. of FMC Corp.
Horner City, Pa.
6-3
|
CODE | MANUFACTURER ADDRESS
59730 Thomas and Betts Co. Philadelphia, Pa.
61637 Union Carbide Corp. New York, N.Y.
63743 Ward Leonard Electric Co.
Mt. Vernon, N.Y.
70563 Amperite Co. inc, Union City, NJ.
70801 Beemer Engrg Co.
Fort Washington, Pa.
70903 Belden Corp. Chicago, HI.
71218 Bud Radio, Inc. Willoughby, Ohio
71278 Cambridge Thermionic Corp.
Cambridge, Mass.
71400 Bussmann Mfg. Div.of McGraw &
Edison Co. St. Louis, Mo.
71450 CTS Corp. Elichart, ind.
71468 LT.T, Cannon Electric Inc,
Los Angeles, Calif,
71580 Giobe-Union Inc.
Milwaukee, Wis.
71700 General Cable Corp. Cornish
Wire Co. Div. Williamstown, Mass,
71707 Coto Coil Co. Inc. Providence, R.Í,
71744 Chicago Miniature Lamp Works
Chicago, №.
71785 Cinch Mfg. Co. and Howard
B. Jones Div. Chicago, IIL.
71984 Dow Corning Corp, Midland, Mich.
72136 Electro Motive Mfg. Co. Inc.
Willimantic, Conn,
72618 Diatight Corp. Brooklyn, N.Y,
72689 General Instrument Corp. Newark, N.J.
72765 Drake Mfg. Со. Harwood Heights, Hi.
72962 Elastic Stop Nut Div, of
Amerace Esna Corp. Union, N.J.
72982 Erie Technological Products
Erie, Pa.
73096 Hart Mfg, Co. Hartford, Conn.
73138 Beckman Instruments
Fuilerton, Calif,
73168 Fenwai, Inc. Ashiand, Mass.
73233 Hughes Aircraft Co. Electron
Dynamics Div, Torrance, Calif.
73445 Amperex Electronic
Hicksville, N.Y.
73506 Bradiey Semiconductor Corp.
| New Maven, Conn.
73559 Carling Electric, Inc. Hartford, Conn.
73734 Federal Screw Products, inc. |
Chicago, iii.
74193 Heinemann Electric Co. Trenton, N.J.
74545 Hubbell Harvey Inc. Bridgeport, Conn.
74868 Amphenol Corp. Amphenol RF Div.
Danbury, Conn.
74870 E.F. Johnson Co. Waseca, Minn.
Table 6-3. Code List of Manufacturers
CODE | MANUFACTURER ADDRESS
75042 IRC Div. of TRW, Inc. Philadelphia, Pa.
75183 "Howard B. Jones Div. of Cinch
Mfg. Corp. New York, N.Y.
75376 Kurz and Kasch, inc. Dayton, Ohio
75382 Kilka Electric Corp. Mt. Vernon, N.Y,
75915 Littiefuse, inc. Des Plaines, HI,
76381 Minnesota Mining and Mtg. Co,
St. Paul, Minn,
76385 Minor Rubber Co. Inc. Bloomfield, N.J.
76487 James Millen Mfg. Co. Inc. Malden, Mass.
76483 JW. Miller Co. Compton, Calif,
78530 Cinch City of Industry, Calif.
76854 Oak Mfg. Co. Div. of Oak Electro/
Netics Corp. Crystal Lake, 11,
77068 Bendix Corp., Electrodynamics Div.
No. Hollywood, Calif.
77127 Palnut Co. Mountainside, N.J.
77147 Patton-MacGuyer Co. — Providence, RE.
77221 Phaostron instrument and Electronic Co.
South Pasadena, Calif.
77252 Philadelphia Steel and Wire Corp.
Philadelphia, Pa.
77342 American Machine and Foundry Co.
Princeton, Ind.
77630 TRW Electronic Components Div.
Camden, N.J.
77764 Resistance Products Co. Harrisburg, Pa.
78188 Ито Тоо! \Мот5 Ик, Elgin, HI.
78452 Everlook Chicago, Inc. Chicago, iii.
78488 Stackpole Carbon Co. St. Marys, Pa.
78526 Stanwyck Winding Div. San Fernando
| Electric Mfg. Co. Inc. Newburgh, N.Y.
78553 Tinnerman Products, inc. Cleveland, Ohio
78584 Stewart Stamping Corp. Yonkers, N.Y.
79136 Waldes Kohincor, inc. LIC, NY.
79307 Whitehead Metals Inc. New York, N.Y.
79721 Continental-Wirt Electronics Corp.
Philadelphia, Pa.
79963 Zierick Mfg. Co. Mt. Kisco, N.Y.
80031 Mepco Morristown, N.J.
80294 Bourns, Inc. Riverside, Calif.
81042 Howard Industries Racine, Wisc.
81073 Grayhill, inc. La Grange, №.
81483 International Rectifier El Segundo, Calif.
81751 Columbus Electronics Yonkers, N.Y.
82089 Goodyear Sundries & Mechanica! Co. Inc.
New York, N.Y.
82142 Airco Speer Electronic Components
Du Bois, Pa.
82219 Sylvania Electric Products Inc.
Emporium, Pa.
82389 Switchcraft, Inc. Chicago, il.
82647 | Metals and Controls Inc. Attleboro, Mass.
“Use Code 71785 assigned to Cinch Mfg. Co., Chicago, Ill.
6-4
CODE MANUFACTURER ADDRESS
82866 | Research Products Corp. Madison, Wisc.
82877 Rotron Inc, Woodstock, N.Y.
82893 Vector Electronic Co. Glendale, Calif.
83058 Carr Fastener Co. Cambridge, Mass.
83186 Victory Engineering Springfield, N.J.
83298 Bendix Corp. Eatontown, N.J.
83330 Herman H. Smith, inc. Brooklyn, N.Y.
83385 Central Screw Co. Chicago, Il,
83501 Gavitt Wire and Cable Brookfield, Mass.
83508 Grant Pulley and Hardware Co.
West Nyack, N.Y.
83594 Burroughs Corp. Plainfield, N.J.
83835 U.S. Radium Corp. Morristown, N.J.
83877 Yardeny Laboratories New York, N.Y.
84171 Arco Electronics, Inc. Great Neck, N.Y.
84411 TRW Capacitor Div. Ogatlala, Neb.
86684 RCA Corp, Harrison, N.J.
86838 Rummel Fibre Co. Newark, N.J.
87034 Marco & Oak industries Anaheim, Calif.
87216 Phiico Corp. Lansdale, Pa,
87585 Stockwell Rubber Co. Philadelphia, Pa.
87929 Tower-Olschan Corp. Bridgeport, Conn.
88140 Cutler-Hammer inc. Lincoln, lil.
88245 Litton Precision Products inc, USECO
Van Nuys, Calif,
90634 Guiton Industries Inc. Metuchen, N.J.
90763 United-Car inc. Chicago, ili.
91345 Miller Dial and Nameplate Co. |
Ei Monte, Calif.
91418 Radio Materials Co. Chicago, Hi.
91506 Augat, Inc. Attieboro, Mass.
91637 Date Electronics, inc. Columbus, Neb.
91662 Eico Corp. Willow Grove, Pa.
91929 Honeyweil inc. Freeport, Ili.
92825 Whitso, Inc. Schiller Pic, HE
83332 Sylvania Electric Prod. Woburn, Mass.
93410 Essex Wire Corp. Mansfield, Ohio
94144 Raytheon Co. Quincy, Mass.
94154 Wagner Electric Corp. Livingston, N.J.
84222 Southco Inc. Lester, Pa.
95263 Leecraft Mfg. Co. Inc. LLC, NY.
95354 Methode Mfg. Co. Rolling Meadows, lil.
95712 Bendix Corp. Franklin, Ind.
95987 Weckesser Co, inc, Chicago, Hl.
96791 Ampheno! Corp. Janesville, Wis.
97464 Industrial Retaining Ring Co.
lrvington, N.J.
97702 IMC Magnetics Corp. Westbury, N.Y.
98291 Sealectro Corp, Mamaroneck, N.Y.
98410 ETC Inc. Cleveland, Ohio
98978 International Electronic Research Corp.
Burbank, Calif,
99034 Renbrandt, Inc. Boston, Mass,
Table 6-4. Replaceable Parts
REF. И MFR. HP
DESIG. DESCRIPTION TQ MER. PART NO. CODE! PART NO. RS
A1 interconnect and Power Supply Board 1 28480 06825-60020
Ci Not Assigned
C2 fxd, elect. 100ufF 25Vdc 1 30D107G025DD2-DSM 56289| 0180-0094 | 1
C3,4 fxd, elect. 325uF+ 35Vde 2 D34656-DEE 562891 0150-0332 | 1
C5-7 fxd, cer. .OSuF 400Vdc 8 33C17A3-CDH 56288] 0150-0052 | 2
ce fxd, elect. 200uF 175Vde 2 68010223 56289 | 0180-1885 | 1
ce fxd, cer. .0BuF 400Vdc 33C17A3-CDH 56289] 0150-0052
co fxd, elect. B000uF 50Vdc 2 3607890 56289! 0180-0449 | 1
С1 1-14 fxd, cer. 0.5uF 400Vdc 33C17A3-CDH 562891 0150-0052
C15 fxd, elect. B000uF 50Vdc 3607890 56289) 0180-0449
Ci6 fxd, elect. 200uF 175Ydc 68D10223 562881 0180-1885
C17,18 fxd, cer. 47uF 25Vdc 2 5C11B7-CML 56289| 0160-0174 | 1
CR1-4 Diode, Si. 200mA 75V 4 1N4148 284801 1901-0050 | 4
CR5-8 Diode, Si. 200prv 1A 8 1N5095 28480] 1901-0327 | 5
CRY Not Assigned
CR10-11 | Diode, Si. 400V 1A 4 1N5060 03508| 1901-0328 | 4
CR12-15 | Diode, Si. 200V 1.BA 4 1N4999 04713] 1801-0416 | 4
CR16,17 | Diode, Si. 400V 1A 1N5060 03508| 1901-0328
CR18 Diode, Hot Carrier 1 284801 1901-0535 | 1
CR19 Not Used (Jumper)
CR20 Diode, Hot Carrier 1 284801 1901-0518 | 1
J1,2 Connector, Printed Circuit Edge 2 252-18-30-340 71785| 1251-2134 | 1
J3,4 Connector, Muiti-contact 2 3428-2002 763811 1251-3119 | 1
K1 Relay, 6Vdc coil voltage 1 603-6 09023] 0490-0745 | 1
QT Power PNP Si. 1 2N4036 02735] 1853-0041 | 1
Q2 SS NPN Si. 1 2N4141 01295] 1854-0071 | 1
Q3 Power NPN Si. 1 2N1711A 28480] 1854-0244 | 1
Q4 5S PNP Si. 1 2N2907 seo 1853-0099 | 1
Ri 2,3 var, ww, 100, 5%, 1W 3 CT-106-4 84048! 2100-1755 | 1
R4 fxd, comp. 22K 5% ZW 2 EB-2235 01121] 0686-2235 | 1
R5,6 fxd, comp. 2K 5%, 1W 2 СВ2025 01121} 0689-2025 | 1
R7 fxd, comp. 22K 5%, ZW EB2235 011211 0686-2235 |
RS var, ww 5K 5%, 1W 2 CT-100-4 84038 2100-0741 1
R9,10 xd, film 3K 1%, 1/8W 3 CEA T-0 07716) 0757-1093 | 1
R11 fxd, film, 34.8K 1%, 1/8W 1 CEA T-0 07716] 0757-0123 | 3
R12 Not Used (Jumper)
R13 var, ww, 5K 5%, 1W CT-100-4 84048! 2100-0741
Rid fxd, film, 3K 1%, 1/8W CEA TO 07716! 0757-1093 | 1
R15 Not Used, (Jumper)
R16 fxd, film, 11.3K 1%, 1/8W 1 CEA TO 07716| 0698-4121 | 1
R17 fxg, film, 1.69K 1%, 1/8W 1 CEA 7-0 07716; 0698-4428 | 1
Ri8 var, ww, 200, 5%, 1W 2 CT-100-4 84048! 2100-1771 | 1
R19 fxd. film, 1.69K 1%, 1/8W CEA TC 07716] 0698-4428
R20 var, ww, 200, 5%, 1W CT-100-4 84048! 2100-1771
R21 fxd, fitm, 2.37K 1%, 1/8W 1 CEA T-0 07716! 0698-3150 | 1
R22 fxd, film, 100K 1%, 1/8W 1 CEA T-0 077161 0757-0401 | - 1
R23 fxd, film, 471, 1%, 1/8W 1 CEA TO 07718] 0698-5541 | 1
R24 xd, film, 6.2K 1%, 1/8W CEA T-0 077161 0698-5087
R25 fxd, comp. 4.3K 5%, ZW 1 EB-4325 01121 0686-4325 | 1
6-5
Table 64. Replaceable Parts
REF, MFR. HP
DESIG. DESCRIPTION TQ MFR. PART NO. CODE | PART NO. RS
A1R26 fxd, comp. 7,5K 5%, %W 2 ЕВ-7525 01121 1 0686-7525 | 1
R27 fxd, comp. 750, 5%, AW 1 EB-7515 01121 | 0686-7515 | 1
R28 fxd, comp. 1K 5%, 4W 1 EB-1025 01121 { 0686-1025 | 1
R28 fxd, film, 3.92K 1%, 1/8W 1 CEA T-C 07716 | 0757-0435 | 1
R30 fxd, film, 6.81K 1%, 1/8W 1 CEA T-0 07716 | 9757-0439 | 1
R31 fxd, comp. 7.5K 5%, LW 2 EB-7525 01121 | 0686-7525 | 1
R32 fxd, film, 1.3K 1%, 4W 1 CCA T-0 07716 | 0757-0735 | 1
R33 Not Assigned
R34 fxd, film, 5.49K 1%, 1/8W 1 CEA T-D 07716 | 0698-3382 | 1
R35 Not Assigned
R36 fxd, film, 8.09K 1%, 1/8W CEA T-8 07716 | 0757-0288
R37 fxd, comp. 620, 5%, XW 1 EB-6215 01121 | 0686-6215 | 1
R38 fxd, ww, 400, 5%, 5W 7 | $ | 243E 56289 | 0811-1857 | 1
R39 fxd, ww, 500, 5%, 5W 1 243E 56289 | 0811-1858 | 1
R40 Not Assigned
R41 fxd, film, 10K 1%, 1/8W 1 CEA T-0 07716 | 0757-0442 | 1
R42 fxd, ww, 10.24K .05%, %W 1 132F 20940 | 0811-2958 | 1
R43 fxd, comp. 1.3K 5%, 4W 1 EB-1325 01121 | 0686-1325 11
R44,45 | xd, fiim, 21.5, 1%, 1/8W 4 CEATD 07716 | 0698-3430 | 4
R45-50 | Not Assigned
R51,52 fxd, film, 42.2K 1%, 1/8W 2 CEA T-0 07716 | 0698-3450 | 2
R53 txd, film, 160K 1%, 1/8W 1 CEA T-0 07716 | 0698-5082 | 1
Rb4 fxd, film, 42.2, 1%, 1/8W 1 CEA T-0 07716 | 0757-0316 | 1
R55 Thermistor, 64, 10% 1 LB16J1 02606 | 0837-0023 | 1
R56 fxd, film, 3.16K, 1%, 1/8W 1 CEA T-0 07716 | 0757-0279 | 1
R57 Not Assigned
RES fxd, film, 1K, 1%, 1/8W 1 CEA T-0 07716 | 0757-0280 | 1
REO Not Assigned
R60 fxd, ww, 1, 5%, 3W 1 242€ 1RO5 56289 | 0811-1732 | 1
R61-65 Not Assigned
Н66-69 | fxd, film, 6K, 1%, 1/8W 4 CEA T-0 07716! 0698-3476 | 4
R70,71 | txd, film, 21.5, 1%, 1/8W CEA T-0 07716 | 0698-3430
51,2 Switch, rotary, 3 sections 2 28480 | 3100-1941 2
VR1 Diode, zener 6.2V 2 1N825 28480 | 1902-1221 | 2
VR2 Not Assigned
VR3 Diode, zener 6.2V 1N825 28480 | 1802-1221
A2 Voltage and Current Control Plug-in
Board 1 28480 [06825-60021
C1 fxd, mica, 30pF, 5%, 300V 5 RDM15E300J3S 00853 | 0160-0181 1 1
ca fxd, cer, 390pF, 1%, 500V 1 DD472 71590 | 0160-0474 | 1
C4,5 fxd, mica, 30pF, 5%, 300V RDM152300J35 00853 | 0160-0181
Сб fxd, cer., .01uF 1KV C023A102J103MS38-CDH | 56289! 0150-0012
C7 fxd, cer., 3900pF, 5%, 500V 1 28430 | 0160-2723 | 1
C8 fxd, mica, 30pF, 5%, 300V RDM1BE300.43S 00853 ; 0160-0181
C9 fxd, myiar, .001uF, 10%, 200V 1 292P10292-PTS 56289 | 0160-0153 | 1
C10 fxd, tant. 2.2uF, 20Vdc 1 150D225X0020A2-DYS 56289 | 0180-0155 | 1
C11,12 fxd, mylar, O15uF, 10%, 200V 2 292P15392-PTS 56289 | 0160-0194 | 2
C13 fxd, elect. 100uF, 6Vdc 1 30D107G006CC2-DSM 56289 | 0180-1734 | 1
6-6
Table 6-4. Replaceable Parts
REF. MFR. HP
DESIG. DESCRIPTION TQ MFR. PART NO. CODE |PART NO. RS
A2C14 fxd, mica, 30pF, 5%, 300V RDM15E£300J38 00853 10160-0181
CR1,2 Diode, Si, 200mA 75V 13 1N4148 28480 | 1901-0050 | 7
CR34 Diode, Si. 250mW 200prv 6 1N485 28480 | 1901-0033 | 5
CARS Diode, Si. 200mA 75V 1N4148 28480 | 1901-0050
CR6 Not Assigned
CR7.8 Diode, Si. 250mW 200prv 1N485 28480 | 1901-0033
CRY Stabistor, Si. 10prv 400mW 1N4157 28480 | 1901-0460
CR10 Diode, Si. 200mA 75V 1N4148 28480 | 1901-0080 | 1
CR11,12 | Diode, Si. 250mW 200prv 1N485 28480 | 1901-0033
CR13,14 | Diode, Si. 200mA 75V 1N4148 28480 | 1901-0050
CR15-17 | Not Assigned
CR18-24 | Diode, Si. 200mA, 75V 1№ 148 28480 | 1901-0050
Ki Reed Relay 1 28480 10480-1013] 1
K2,3 Reed Relay 2 28480 | 0490-0399 | 2
Q1-4 SS NPN Si. 5 2N4 141 01295 | 1854-0071 1 5
Q5 55 PNP Si. 1 282907 56289 | 1853-0099 | 1
QS SS NPN GI, 2N4141 01295 | 1854-0071
R1,2 fxd, film, 1K 1%, 1/8W CEA T-0 07716 | 0757-02801 1
R3 fxd, ww, 714, 1%, 4W 1 R303B 01686 | 0811-19351 1
R4 fxd, film, 1K, 1%, 1/8W CEA TO 07716 | 0757-0289
RE fxd, film, 6K, 1%, 1/8W 5 CEA TO 07716 | 0698-3476} 1
RE,7 fxd, ww, 10.24K .05%, 4W 2 132F 20840 | 0811-29584 1
RS fxd, film, 6K, 1%, 1/8W CEA 1-0 07716 | 0698-3476
R9 fxd, ww, 20.48K, .05%, *W 1 132F 20940 | 0811-2859
R10 fxd, film, 6K, 1%, 1/8W CEA T-0 07716 | 0698-3476
R11,12 1 Exd, film, 100, 1%, 1/8W 4 CEA T-0 07716 | 0757-0401 | 1
Н13 fxd, film, 4.78K, 1%, 1/8W 1 CEA T-0 07716 | 0757-0437 | 1
R14 fxd, film, 3K, 1%, 1/8W 1 CEA T-0 07716 | 0757-1093 | 1
R15 fxd, film, 1K, 1%, 1/8W CEA Т-0 07716 | 0757-0280
R16 fxd, ww, 10.24K, .05%, %W 132F 20940 | 0811-2058
R17,18 fxd, film, 1.18K, 1%, 1/8W 2 CEA T-0 07716 | 0698-3512 1
R19 var, ww, 10K, 5%, 1W 2 CT-106-4 11502 | 2100-0989) 1
R20 fxd, film, 67.6K, 1%, WW 2 CCA T-0 07716 | 0757-0114 1 1
R21 var, ww 10K, 5%, 1W CT-106-4 11502 | 2100-0989
R22 fxd, film, 67.6K, 1%, UW CCA T-0 07716 | 0757-0114
R23 Not Used (Jumper)
R24 fxd, comp. 3.8, 5%, VW 1 EB-39G5 01121 | 0698-5139] 1
R25 fxd, film, 200K, 1%, 1/8W 1 CEA T-0 07716 § 0757-0472] 1
R26 Not Used (Jumper) ;
R27 fxd, ww, 0.5, .5%, SW 1 T7A 01686 | 0811-2103] 1
828,29 | fxd, film, 383K, 1%, 1/8W 2 CEA T-0 07716 | 0698-3459] 1
R30,31 Not Assigned
R32,33 | fxd, film, 9.09K, 1%, 1/8W 2 CEA T-0 07716 | 0757-0288] 2
R34 fxd, fitm, 12K, 1%, 1/8W 1 CEA T-0 07716 | 0698-5088 1
R35 fxd, film, 2K, 1%, 1/8W 3 CEA T-0 07716 § 0767-0283; 1
R36 fxd, film, 8.2bK, 1%, 1/8W 2 CEA T-0 07716 | 0757-0441) 1
R37,38 | fxd, film, 21.5, 1%, 1/8W 2 CEA 7-0 07716 | 0757-3430! 1
R39 fxd, film, 8.25K, 1%, 1/8W CEA T-0 07716 | 0757-0441
6-7
Table 64. Replaceable Parts
iw gry
REF. MFR. HP
DESIG. DESCRIPTION TO MER. PART NO. CODE | PART NO.
A2R40 fxd, comp. 82, 5%, %W 1 | EB-8205 01121 | 0686-8205 | 1
R41 fxd, film, 5.11K, 1%, 1/8W 2 | CEAT-O 07716 | 0757-0438 | 1
R42 fxd, ww, 10.24K, 056%, %W 132F 20940 | 0811-2958
R43,44 Not Assigned
Ras fxd, film, 3K, 1%, 1/8W 21 CEAT.O 07718 | 0757-1093 | 1
R46 fxd, film, 7.5K, 1%, 1/8W 21 CEATO 07716 | 0757-0440 | 1
R47 fxd, film, 6.2K, 1%, 1/8W CEA T-0 07716 | 0698-5087
R48 fxd, fitm, 5.11K, 1%, 1/8W CEA T-0 07716 | 0757-0438
R49 fxd, film, 15K, 1%, 1/8W 1| CEAT-0 07716 | 0757-0446 | 1
R50 fxd, comp. 1K, 5%, %W 1 | EB-1025 01121 | 0686-1925 | 1
R51 fxd, film, BK, 1%, 1/8W CEA T-0 07716 | 0698-3476
R52,53 | fxd, film, 100, 1%, 1/8W CEAT-0 07716 | 0757-0401
R54 fxd, film, 6K, 1%, 1/8W CEA T-0 07716 | 0698-3476 ’
R55 xd, film, 27.4K, 1%, 1/8W 11 CEAT-0 07716 | 0757-0452 | 1
R56 fxd, film, 2K, 1%, 1/8W CEA T-0 07716 | 0757-0283
R57 xd, film, 7.5K, 1%, 1/8W CEA T-0 07716 | 0757-0440
R58 var, ww, 1K, 5%, 1W 1 | CT-106-4 84048 | 2100-1758 | 1
R59 var, ww, 10, 5%, TW 1 | CT-106-4 84048 | 2100-1752 | 1
R60,61 | var, ww, 100, 5%, 1W 2 | CT-106-4 84048 | 2100-1755 | 1
R62 Not Assigned
R63 fxd, film, 3.83K, 1%, 1/8W 2 | CEAT-O 07716 | 0698-3153 | 1
R64 fxd, film, 2.15K, 1%, 1/8W 21 CEAT.O 07716 | 0698-0084 | 1
R65 fxd, film, 3.83K, 1%, 1/8W CEA T-0 07716 | 0698-3153
R66 fxd, film, 2.15K, 1%, 1/8W CEA T-0 07716 | 0698-0084
R67-70 Not Assigned
R71,72 | fxd, film, 1K, 1%, 1/8W CEA T-0 07716 | 0757-0280
R73 fxd, film, 6.81K, 1%, 1/8W CEA T-0 07716 | 0757-0439
R74 fxd, film, 1K, 1%, 1/8W CEA T-0 07716 | 0757-0280
R75 fxd, film, 5.49K, 1%, 1/8W 1 | CEAT-0 07716 | 0698-3382 | 1
R76 fxd, film, 24.3K, 1%, 1/8W 2 | CEAT-O 07716 | 0757-0451 | 1
R77 fxd, film, 2.43K, 1%, 1/8W 11 CEAT.0 07716 | 0757.0431 | 1
R78 fxd, film, 24.3K, 1%, 1/8W CEA T-0 07716 | 0757-0451
R79 fxd, film, 2K, 1%, 1/8W CEA T-0 07716 | 0757-0283
$1 Slide Switch, 0.54, 125Vac/dc 1 j GF126-0020 79727 | 3101-1311} 1
VR1-5 Diode, zener 6.2V 5 | 1N825 28480 | 1902-1221 | 5
VR6 Diode, zener 7.50V 400mW 2 | SZ10939-146 04713 | 1902-0064 | 2
VR7 Not Assigned
VRB Diode, zener 7.60V 400mW SZ 10939-146 04713 | 1902-0064
U1-5 IC, Linear Amplifier 5 1 LM301AH 27014 | 1820-0223 | 5
A3 Power Amplifier Plug-In Board 1 28480 06825-60022
Ci fxd, elect. 20uF 15Vde 1 | 30D206G0168B2-DSM 56289 | 0180-0300 | 1
C2 fxd, elect. uF 35Vdc 1 | 150D105X9035A2 56289 | 0180-0291 | 1
C3-6 Not Assigned |
C7 fxd, cer., .22uF 50Vde 1 1 5C52B-CML 56289 { 9160-0263 | 1
cs fxd, cer., .02uF 500Vde 2 | ©0238501.2037825 56289 | 0160-0468 | 1
co fxd, mica, 150pF 300Vde 1 | RDM15F151J3C 00853 | 0140-0196 | 1
C10 fxd, mica, 470pF 500Vdc to 00853 [ 0140-0149! 1
C11 fxd, mylar, .001uF 200Vde 1 | 192P10292 56289 | 0160-0153 | 1
6-8
Table 6-4. Replaceable Parts
REF. MER.| HP
DESIG. DESCRIPTION TO MFR. PART NO. CODE | PART NO. | PS
A3C12.13 | fxd, mylar .047uF 200Vde 2 | 292P47352-PTS 56289 | 0160-0138 | 1
C14 fxd, cer., .02uF 500Vdc C0238501J2032525 56289 | 0160-0468
C15 fxd, cer, 5000pF 1KV 1 | C023B102G502ZS31-CDH! 56289 | 0160-0899 | 1
CR1.7 Diode, Si. 200mA 75V 13 | 1N4148 28480 | 1901-0050 | 7
CR8-13 | Not Assigned
CR14 Stabistor, Si. 10prv 400mW 1 1N4157 28480 | 1801-0460 1
CR15-17 | Diode, Si. 200mA 75V 1N4148 28480 | 1901-0050
CR18 Not Assigned
CR19-21 | Diode, Si. 200mA 75V 1N4148 28480 | 1901-0050
CR22 Diode, Hot Carrier 1 28480 | 1901-0518 | 1
01 SS NPN Si. 3 | 284141 28480 | 1854-0071 | 3
Q2 SS NPN Si. 8 | 40346 86684 | 1854-0095 | 8
03 SS PNP Si. 6 | S15099 04713 | 1853-0038 | 6
04,5 $$ NPN Si, 2N4141 28480 | 1854-0071
Q6 SS PNP Si. SJ5099 04713 | 1853-0038
Q7 SS NPN Si. 40346 86684 | 1854-0095
08,9 $S PNP Si. 2 28480 | 1853-0037 | 2
010-12 | SS NPN Si. 40346 86684 | 1854-0095
013 $5 PNP Si. SJ5099 04713 | 1853-0038
Q14-16 | SS NPN Si. 40346 86684 | 1854-0095
Q17-19 | SS PNP Si. $.16099 04713 | 1853-0038
R1,2 fxd, comp, 15K, 5%, %W 2 | EB-1535 01121 | 0686-1536] 1
R3 fxd, comp, 510, 5%, W 1 1 EB-5115 01121; 0686-5115 | 1
Rá Not Assigned
В5 fxd, comp, 3K, 5%, ZW 1 | EB-3025 01121 | 0686-3025 | 1
R6 fxd, comp, 1K, 5%, SW 2 | EB-1025 01121 | 0686-1025 | 1
R7 fxd, comp, 1.2K, 5%, ZW 2 | EB-1225 01121 | 0686-1225 | 1
RB fxd, comp, 8.2K, 5%, УМ 5 | EB-8225 01121 | 0686-8225 | 1
RO fxd, comp, 750, 5%, YW 2 | EB-7515 01121 | 0686-7515 | 1
R10 fxd, comp, 6.2K, 5%, %W 1 | EB-6225 01121 | 0686-6225 j 1
R11,12 | fxd, comp, 8.2K, 5%, ZW EB-8225 01121 | 0686-8225
R13 fxd, comp, 1.2K, 5%, %W EB-1225 01121 | 0686-1225
R14 fxd, comp. 8.2K, 5%, ZW EB-8225 01121 | 0686-8225
R15 fxd, comp. 5.1K, 5%, ZW 3 | EB-5125 01121] 0686-5125} 3
R16 fxd, comp. 8.2K, 5%, УМ EB-8225 01121] 0686-8225
R17 fxd, comp. 750, 5%, %W EB-7515 01121] 0686-7515
R18 xd, comp. 1K, 5%, KW ER-1025 01121! 0686-1025
R19 fxd, comp. 10K, 5%, VW 3 | EB-1035 011211 0686-10351 1
R20 Not Assigned
R21 fxd, comp. 5.1K, 5%, “LW EB-5125 01121] 0686-5125
R22 fxd, comp. 1.5K, 5%, УАУ EB-1525 01121 | 0686-1525
R23 fxd, comp. 5.1K, 5%, %W EB-5125 01121 | 0686-5125
R24 ixd, comp. 5.6K, 5%, ZW 1 |. EB-5625 011211 0686-5825 | 1
R25 fxd, comp 100, 5%, %W 1 | EB-1015 01121] 0686-1015] 1
R26 fxd, comp. 5.3K, 5%, УМ 1 | EB-4325 011211 0686-4325 | 1
R27 fxd, comp. 1.8K, 5%, %2W 1 | EB-1625 01121| 0686-1625 | 1
R28 fxd, comp. 18K, 5%, %W 1 | EB-1835 011211 0686-1835 | 1
#29 fxd, comp. 62, 5%, %W 1 | EB-6205 01121] 0686-6205 i 1
R30 txd, comp. 200, 5%, YW 1 | EB-2015 011211 0686-2015 | 1
6-9
Table 6-4. Replaceable Parts
REF,
MFR. HP
DESIG. DESCRIPTION TQ MFR. PART NO. CODE | PART NO. RS
A3R31 fxd, comp, 10K, 5%, GW ЕВ-1035 01121 1 0686-1035
R32 fxd, comp, 30, 5%, 4W 3 E8-3005 01121 | 0686-3005 | 1
R33 fxd, comp, 10K, 5%, “BW ES-1035 01121 1 0686-1035
R34 fxd, comp, 30, 5%, AW EB-3005 07121 | 0686-3905
R35,36 fxd, comp. 330, 5%, 4W 2 EB-3315 01121 | 0686-3315 Е 1
R37-42 fxd, comp. 39,.5%, #W 6 EB-3905 01121 | 0686-3905 | 1
R43,44 fxd, comp. 360, 5%, %W "| EB-3615 01121 | 0686-3615
R45-48 fxd, ww, 1, 5%, 5W 6 243E 56289 | 0811-1340 | 1
R49 Not Assigned |
150,51 fxd, ww, 1, 5%, 5W 243k 55289 | 0811-1340 | 1
R52 Not Assigned
R53 fxd, comp. 30, 5%, YW £B-3005 01121 | 0686-3005
R54 fxd, comp. 47, 5%, 4W 1 EB-4705 01121 | 0686-4705 | 1
RES fxd, comp. 10, 5%, 2W 1 EB-1005 011211 0686-1005 | 1
R56-65 Not Assigned |
R66 fxd, comp. 160K, 5%, УМУ 1 EB-1645 01121 | 0686-1645 | 1
VR1,2 Diode, zener 28.7Vdc 2 5211213-272 04713 | 1902-0572 | 2
ña Power Module (includes slide, switch
and fuse) 28480 | 5060-1189
F1 Fuse, 1A 250V Slo-Blo 1 1 MDX-1A 714001 2110-0007 | 2
Ab Front Panel — Electrical
DS1 Indicator Lamp {LINE) 1 28480 | 2140-0037 | 1
DS? indicator, Light Emitting
Diode (CURRENT MODE) 1 28480 | 1990-0325 | 1
Mi Voltmeter, Dual Range DC or AC
(12.4, £24Vdc or 1,6, 16V rms) 1 28480 | 1120-1371 | 1
M2 Ammeter Dual Range DC or AC
(£0.24, £2 4A or 0.16, 1.6A rms) i 284801 1120-1379 | 1
RA var, ww, dual ganged 15K-15K
{CURRENT Control) 1 28480! 2100-3271 1
R2 var, ww, 28K {VOLTAGE Control) 1 284801 2100-3272 | 1
Si Switch, Toggle SPDT
BA (LINE Switch) 1 28480 | 3101-1605 | 1
52 Switch, Rotary, 3 Sections
(RANGE/MODE Selection Switch) 1 28480 | 3100-1942 | 1
Аб Heat Sink Assembly — Electrical
Q1-4 Power NPN Si. 4 2N3715 04713 | 1854-0264 |! 4
TB1-3 Terminal Block 3 28480 | 0360-1766 | 1
Wi,2 Ribbon Cable Assembly 2 28480 | 5050-9662 1
Chassis — Électrical
С1,2 fxd, mylar, 1u¥F, 220Vac 2 439P 1059220 562891 0160-3679 | 1
C3 fxd, cer., .1uF, 500V 1 41C92B5-CDH 56289 | 0160-0269 } 1
T1 Transformer, Power 1 28480 [06825-80091| 1
6-10
Table 64. Replaceable Parts
REF. MFR. MP
DESIG. DESCRIPTION TQ MFR. PART NO. CODE! PART NO. RS
A1 interconnect and Power Supply
Board -- Mechanical
Heat Dissipator (Q1, 03} 2 NF-207 058201 1205-0033
A3 Power Amplifier Board — Mechanical
Heat Dissipator (Q6, 09-011) 4 NF-207 05820] 1205-0033
Heat Dissipator (014-019) 6 2227-8 131031 1205-0206
Heat Sink Assembly — Mechanical
Bushing insulator (01-04) 4 28480! 0340-0795
insulator, Mica (01-04) 4 284801 0340-0174
Chassis Rear 1 28480; 5000-9359
Heat Sink 1 28480 | 5020-8401
Barrier Strip Board Assembly 1 28480 | 5060-9663
Heat Sink Board Assembly 1 28480 106826-50023
Front Panel — Mechanical
Bezel, Meter 2 28480] 4040-0483
Control Pane! 1 28480 106825-60001| 1
Output Panel 1 28480 | 5000-9366
Foot Assembiy 1 28480; 5060-0728
Insulator, Binding Post (Black) 2 28480 0340-0733
insulator, Binding Post (Red) 8 28480 | 0340-0734
Knob {VOLTAGE Control, CURRENT
Control, VOLTAGE METER switch,
CURRENT METER switch) 4 284801 0340-1009
Knob (MODE select} 1 284801 0370-1100
Knob (RANGE select) 1 28480! 0370-1125
Clip 4 284801 1400-0532
Retainer Ring 4 284801 1400-0540
Lamp Holder, Clear 1 28480 5040-0234
Lamp Holder, Black 1 28480 | 5040-0305
Binding Post (Red) 4 284801 1510-0094
Binding Post {Black) 1 28480) 1510-0522
Tilt Stand 1 28480! 1490-0032
Chassis — Mechanical
Cover, Top 1 28480] 5000-3090
— Cover, Bottom 1 284801 5000-9368
Cover, Side 2 284801 5000-9432
Chassis 1 284801 5000-9364
Rear Panel, Bottom 1 284801 5000-9345
Foot Assembly 1 284801 5060-0728
Jumper, Barrier-Strip 9 284801 0360-0523
Standoff 8-32 x .875 2 284801 0380-0849
Cover Barrier Strip 1 284801 5000-9356
6 x 11 Frame Assembly 2 28480] 5060-0703
Miscellaneous
Fuse .DA 250V Slo-Bio 1 MOL-% 71400| 2110-0202
Power Card 1 28480| 8120-1348
Packing Carton 1 284801 9211-1196
Floater Pad, Carton 28480! 9220-1409
Option 007: 10-Turn VOLTAGE Control
var, ww 20K, 5%, 2W, linear, 10-tum 28420| 2100-1867
6-11
SECTION VI
CIRCUIT DIAGRAMS
7-1 INTRODUCTION
7-2 This section contains the circuit diagrams necessary
for the operation and maintenance of BPS/A Mode! 6825A,
7-3 SIMPLIFIED SCHEMATIC DIAGRAM
7-4 This diagram, Figure 7-2, shows the relationship be-
tween the instrument assemblies and ties the schematic dia-
gram sheets together,
7-5 COMPONENT LOCATION ILLUSTRATIONS
7-6 The component iocation diagrams show the physical
location of parts mounted on each assembly. They are in-
7-1
cluded on the schematic diagrams where they apply or on
the rear of the previous schematic. Thus, the schematic
diagram is unfolded to the right and component location
diagram is unfoided to the left.
7-7 SCHEMATIC DIAGRAMS
7-8 The schematic diagram, Figure 7-2, consists of two
sheets. Sheet 1 illustrates the Qutput Power Amplifier Cir-
cuits and Sheet 2 illustrates the Voltage and Current Control
Circuits.
79 Test points {encircled numbers) appear on the schem-
atics. These points coincide with the test points on the |
component location diagrams and are referred to in the text.
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