INSTRUCTION MANUAL Digital Electrometer Model

INSTRUCTION MANUAL
Digital
Electrometer
Model 616
COPYRIGHT 1975 KEITHLEY INSTRUMENTS, INC.
NINTH PRINTING,
FEBRUARY, 1980,
CLEVELAND, OHIO, U. S. A.
DOCUMENT NO.
28039
COWENTS
CONTENTS
Page
Section
SpECIFIC*TIONS
1.
2.
----------------------------------------------------
i”
GENW&jJ,
I~O~TpJ)q
_---__------__-_-___-----------------------
1
INITIAL
pREp)&qlON
_____-_-_-_-_-_----------------------------
4
3.
()PEI(ATING
4.
THEORY
5.
*CCESSORIES
__-___--_--__-__________________________-----------
*g
6.
MAINTENANCE
-------------------_------------------------------
33
7.
REPLACEABLE
SCHEMATICS
lNS*RlJCTIONS
,-Jr
OpE~T~ON
PARTS
__-_------------------------------------
__-___------__-_-___-----------------------
---_-_--------___-__-------------------------
___-____________________________________----------------
5
21
37
61
MODEL 616
1LL”STRATIONS
ILLUSTRATIONS
Figure
NO.
1
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1175
Title
Front Panel
Front Panel Controls
Rear Panel Connectors
Triaxial
Input
Typical
Display
an 1OmV Sensitivity
operation
as B Voltmeter
in NORMALMode
Operation
a8 an Arcmeter in NORMALMode
Loading Effects
in Ammeter Function
Operation
as an Ohmmeter in NORMALMode
Operation
as a Coulombmeter in FAST Mode
Null Method for Current Measurement
Volt-Ammeter
Resistance
Method
Unity Gain (Xl) Measuremene
"se of 1V Recorder Output
Front Panel Of Model 6162
Dual Rack Mounting "sing Model 1007 Hardware
Rear Panel of Model 616 and 6162
Diagram of b,rerconnecrion
Cable between 616 and 6162
Identification
of Pins on Digital
Output Connector
Suggested Hook-up for Daea Lines
Block Diagram of 61616162 System
Timing Diagram for 6162 Outputs
Overall
Block Diagram of Model 616
Simplified
Diagram of Amplifier
Section
Voltmeter
Configuration
- NORMALMode
Ammeter Configuration
- FAST Mode
Coulombmeter Configuration
- FAST Mode
Ohmneter Configuration
- NORMALMode
Functional
Black Diagram of *-m-o
colwereer
Functional
Black Diagram of Large Scale Integrated
Circuit
DigiLal
Display
Chassis Assembly - Exploded View
BOtfOm cover Assembly
Component Layout, PC-321
Gxnpanene Layout, PC-335
Component Layout, PC-322
Component Layout, PC-323
Component Layout, PC-324
Component Layout, PC-325
Page NO.
1
2
3
5
5
7
8
8
10
11
12
12
12
12
13
13
14
14
16
18
19
19
21
22
23
23
24
24
25
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39
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53
54
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57
59
60
SPECIFICATIONS
MODEL 616
SPECIFICATIONS
iS AN AUTORANGINGVOLTMETER
RANGE: $10 microvolts
per digit
(1OmV full
range) eo
Cl00 volts
full
range in five decade ranges.
100%
overranging
to 1999 0" all ranges.
KCUPACY (ZO'=C to 30°C):
+(0.2% of reading x).1% of
range).
READING TIME: Less the" 4 seconds to within
0.1% of
final
reading,
except where limited
by source characteristics.
ZERO DRIFT: Less than (50 microvol~s
M.Ol% Of range)
per 'C. and less than 100 microvolts
per 24-hour
period after
two hours warm-up (during which drift
does "a~ exceed 500 microvolts).
IOISE:
Cl0 microvolts
with input shorted.
tNl'UT IMPEDANCE: Greater than 2 x 1014 ohms shunted
by 20 picofarads.
Input resistance
ms also be
selected
in decade see"s from 10 ?o 10 I1 ohms.
POR”AL MODE REJECTION RATIO:
NMRR
RANGE
MAX. AC
94dB
1OmV
2v e-p
80dB
10omv
2v p-e
SOdB
2ov p-p
1V
60dB
2ov 0-p
10 v
60dB
100 v
2oov p-p
FQT voltage of line frequency
and se least 10% of
Maximum total
input 200
full raoge dc reading.
volts peak ac + dc.
:OMMON"ODE RWECTION RATIO: Greater than 140 dB af
line frequency with 300 volts peak-to-peek
from circuit Lo to chassis ground, up to 1011 ohm source mesistance,
and se least 10% of full range dc reading.
is AN AMMETER
?.ANGE: t10-16 ampere per digit
(lo-13 ampere full
range) to to.1 ampere full range in 13 decade
ranges.
100% overranging
to 1999 on all ranges.
u2cuRAGY (2OY to 30-C):
Range Switch setting
AWurecy
10-l Co 10-/A
k(O.54 of reading +O.l% of range)
t(24 of reading +0.1X of range)
lo-88
10-9 eo lo-1lA
CO% Of reading +a.l% Of range)
YOISE: 2 x lo-15 ampere peak-to-peak
on the most sensitive
range, exclusive
of alpha particle
disturbance.
,FFSET C"Rp,XNT: Less than 5 x lo-15 ampere.
:OMMONMODE REJECTION: 300 volts peak-to-peak
ae line
frequency
from circuit
La eo chassis ground on any
range and with at least 10% of full
range dc reading
will
not degrade accuracy more than 0.3% of range.
(Equivalent
to 140 dB CMRR).
LS AN OHMMETER
WGE:
1 ohm per digit
(1000 ohms full
range) co 1014
ohms full
range in 12 decade ranges.
100% overranging to 1999 on all ranges.
uxxRAm
(2OOC to 3ooc):
Range s;*tci
seetinp
Accuracy
103 to lo’&?
f(0.54 of reading tO.l% of range)
lOan
C(2% of reading +O.l% of range)
109 to 10120
+(5% of reading ffl.19. of range)
IETNOD: Two-terminal
COnSt*nr--Curre"t.
current
equals
reciprocal
of OHMSrange.
iv
AS A COULOMBMETER
RANGE: ?10-15 coulomb ,,er dinit
(LO-12 coulomb full
range) to ?10-5 coulo;b
fuli
range in a decade
ranges.
100% overranging
to 1999 on all ranges.
ACCURACY (20°C to 3O'C):
~(5% of reading +O.l% of
range) 0" a11 ranges.
AS A CONSTANT CURRENT SOURCE
RANGE: 8 CurrentS in decade seeps from 10-5 fo lo-12
ampere using OHMS ranges.
Hi eermina1 is positive.
COmJLIANCE: up to 200 volts.
ACCURACY (ZO'C eo 3O'C):
20.5% from 10-5 eo lo-7
ampere.
*2% at 10-a ampere.
?5% from 10-9 to
10-12 ampere.
LOAD REGULATION: Better
than 0.1% for loads up to
1011 ohms.
GENERAL
DISPLAY:
3 digits
plus 1 overrange
digit;
decimal
position,
polarity,
and overload
indicaeio";
5
readings
per second.
Depending on sensitiviey
setting,
3 least-si~ificant
digits
blink or blaok
"he" overload
condition
exists.
POLARITY SELECTION: Automatic
SENSITIVITY SELECTION: Automatic:
Voltage sensisensieiviey
tivity
selection
is fully
sutomstic.
selection
is a"Wma?Lc hlo decades above and below range switch setting
for resistance,
charge,
and most current
measurements.
Manual:
Front
panel switch.
Remote:
Progrsnmsble
with the Model
6162 Output/Control
(optional).
ISOLATION:
Circuit
Lo to chassis ground; greater
than LO9 ohms shunted by 500 picofarads
(decreasing to lOa ohms at 3O'C and 70% relative
humidity).
Circuit
Lo ma" be floated
UD to tlOO0 voles with
respect
eo chassis ground.
ANALOG OUTPUTS: Unity Gain:
For dc inputs,
oueput
is equal to input within
20 ppm far oueput cur;e"rs
Of 1mA or less.
In Jhe fasf mode output polarity
1 vo1c:
?l volt at
is opposite
input polarity.
up fo 1mA with respect
to circuit
Lo for full range
inwt:
100% o"elxs"!Le
caoaLli1iev.
I" tile normal
mode rhe outpue pol&ity'is
oppbsice input polarity
0PEuTING ENVIRONMENT: 20°C eo 3O"C, 0% co 70% relative
humiditv.
1O'C fo 5O'C wieh derated soec-
ifications.
s&age:
ooc to 70°C.
CONNECTORS: 1npue:
Teflon-insulated
trisxial.
Analog outputs:
Unity gain, 1 volt chassis,
Lo.
1neerna1
and guard; binding
poses.
BCD Output:
co""eceors
for interfacing
?he Node1 6162 Isolated
OutpuflConCrol.
DIMENSIONS; WEIGHT: Style M 3-l/2 in. half-rack,
OVer811 bench size 4 in. high x a-314 in. wide x
15-314 in. deep (100 x 220 x 400 mm); "et weighC,
11 pounds (4,a kg).
POWER: Line Operario":
go-125 0r 180-250 volts
(switch selected),
50-60 Hz, 9 watts.
ACCESSORIES SUPPLIED: Model 6011 Input Cable:
3 ft.
(lm) rriaxial
cable with triaxial
co""ector
and 3
auigaeor
clips.
0374
1
SECTION
1.
GENERAL
l-l.
INTRODUCTION. The Model 616 Digital
Electrometer is an automatic
ranging,
multipurpose
electrometer featuring
sensitivity
to 10 microvolts
per
digit.
Its 3-l/2 digit
LED display
provides
0.2%
voltage
accuracy for a wide range of measuremente.
The Model 616 is essentially
a digital
multimeter
optimized
for measurements from high source impedance.
The 616 provides
wide range capability
when
measuring current,
resistance,
and charge in addition
to voltage.
0773
INFORMATION
1-2.
WARRANTYINFORMATION. The warranty
an the inside
front cover of the manual.
is stated
l-3.
CHANGE NOTICE. Improvements
or changes to
the instrument
not incoqmrated
into the manual
will
be explained
on a Change Notice Sheet
attached
to the inside back cover.
1
GENERAL INFORMATION
MODEL 616
TABLE 1-l.
Panel Controls
Front
Control
Functional
Power ON
Controls
SENSITI"ITY
Sets voltage
sensitivity
ZERO
Adjusts
affset.
RANGE
Sem range
FAST/NOW
Sets instrument
ZERO CHECK
Places
instrument
INPUT
Triaxial
input
line
zero
Description
Paragraph
--
power.
and decimal
paint.
3-4a
3-4a
on a chosen function.
for
either
Feedback
3-3
or Shunt Mode.
3-7b
in ZERO CHECK mode.
3-6
receptacle.
3-2a
FAST/NORMAL
s103
I
ZERO CHECK
POWEk
ON
S202
SENSIiIVITY
s401
FIGURE 2.
RANGE
R119
Front
SlOl
Panel
Controls
n&AXIAL
INPUT
5120
and Display.
0773
MODEL 616
TABLE 1-2.
Rear Panel Controls.
Conrrol
Line
Functional
Switch
Sets
Mates with
117V:
234V:
1v (RED)
3117
Recorder
nominal
line
117V or
234V.
cord.
2-3~
(FU-29)
(FU-40)
ouqmt,
Output,
2-3b
zoov @ 1 lnA maximum.
1" @ 1 mA full
range.
3-2c
3-2c
3-2~
circuit
LOW.
3-2c
Chassis
ground.
3-2~
Rear Panel
-
2-3a
Guard Output.
FIGURE 3.
1175
3-wire
3/16A
l/lOA
Unity-gain
I
for
instrxment
Paragraph
Description
-
Connecears.
3
INITIAL
PREPARATION
MODEL 616
SECTION
2.
Z-l.
GENERAL. This section
describes
procedures
incoming inspection
and preparation
for use.
INITIAL
far
in2-2.
INSPECTION. The Model 616 was carefully
spected both mechanically
and electrically
before
Upon receiving
the instrument,
check
shipment.
for any obvious damage which may have occurred durReport any damages to the shipping
ing transit.
agent.
2-3.
PREPARATION FOR USE.
8.
Line Voltage.
Before power is applied
check
the position
of the LINE switch (5201) on the rear
panel.
Select the 117V position
for operation
from
50-60 Hz line voltages
over the range 9OV to 125"
rms . Select the 234V position
for operation
fro,,,
50-60 Hz line voltages
over the range 1SOV to 250"
rms . Line voltages
which are not cavered by ranges
specified
require
an appropriate
step-up or stepdawn pawer transformer.
4
PREPARATION
After the line "alrage
b. Fuse Installation.
range is selected
check for the proper fuse type
and rating
8% fallows:
117v:
3116
ampere,
type
3AG SLO-BLO (FU-29)
234V:
l/l0
ampere,
type
3AG SLO-BLO (F"-40)
This instrument
requires
*
c. Line Co""ectio"s.
three-wire
line cord (Keiehley
part no. CO-7) which
provides
connections
t" line voltage
(high, common)
and chassis ground.
For operator
safety,
the
chassis ground pin should be connected to earth
ground.
CZ
If the
above
"link"
panel
instzxment
input LO is to be floated,
chassis ground, make certain
that the
between LO and GROUNDon the rear
is removed.
d. Warm-up.
The recommended warmup time far the
Model 616 is two hours, although
if is useable immediately
after power is turned on, for less critical
meas"reme"ts.
1175
OPERATING INSTRUCTIONS
MODEL 616
SECTION
OPERATING
3.
3-1.
GENERAL. This section
describes
the procedures
for operating
the Model 616 for measurement of valrage, ~uccent,
charge, and resistance.
3-2.
HOW TO SELECT FUNCTION. The Model 616 provides
a sinele
front-"anel
rotarv
switch for selection
of
function
and range.
The RANGE Switch (5101) permits
manual selection
of any of four functions,
namely,
VOLT, OHMS, COULOMB, and AMPERE.
3-3.
HO" TO MAKE INPUT AND OUTPUT CONNECTIONS.
a. Incut Receotacle.
This receptacle
Teflon insulated
triaxial
connector.
terminal
is the high impedance input;
shield
is the law inout:
and the outer
case ground.
The m&n;
connector
is
part "0. CS-141 triaxia1
plug.
is a
The center
rhe inner
shield
ie
a Keirhley
3-4.
HOW TO "SE THE, VOLT FUNCTION. The Model 616
provides
five decades of voltage
sensitivity
from
.OlOOO volts
to 100 volts
full range.
The VOLT function is selected
by setting
the RANGE switch to VOLT.
a. Manual Sensifivity
Setfin~s.
The front panel
SENSITIVITY switch has six positions.
ks the switch
is rotated
counter clockwise,
the sensitivity
is
increased.
These positions
correspond
to full
range
sensitivities
of lOO.OV, lO.OOV, l.OOOV, .lOOOV, and
.OlOOOV as in Table 3-1.
Position
six is the
AUTO sensitiviry
mode which enables either
*"tomatic sensitivitv
or remotely
selected
sensitivitv
(when used with the Model 6162).
See paragraph
3-4~
for a complete explanation
of AUTO mode.
TABLE 3-1.
Voltage
Sensitivity
Settings
b. Model 6011 Input Cable.
This cable is a 30
inch long triaxial
cable terminated
with 3 colorcoded alligator
clips.
The input high is identified
by the heavy wire with red insulator.
The input
low is identified
by the thin wire with black insulator.
The case ground is identified
by the thin
wire with green insulator.
C. Rear Panel Terminals.
The rear panel
six binding
posts which are used for making
connections
to the Model 616.
has
special
1. Xl Terminal
(White).
This terminal
provides
an analo,q signal
at unity gain. CAUTION Up to 200
volts my be present
at this terminal.
This terminal
provides
2. 1" Terminal
(Red).
an analog signal
wivh a scale factor of 1 volt far
full range input.
3.
provide
terminal
Lo Terminals
(Black).
These terminals
Either
a connection
to input low.
may be used for system connections.
GUARD Terminal
(Blue).
This
4.
vides a connection
to the amplifier
when in the FAST made.
INSTRUCTIONS
terminal
profeedback
This terminal
pro5. GROUNDTerminal
(Green).
vides a connection
to chassis ground.
A shorting
link is provided
for easy connections
between lo"
and chassis.
For floating
applications,
the link
must be removed.
Setting
Full Range
Display
Maximum
Display
10 nlv
100 nlv
.01000 v
.lOOO v
f .01999 v
f .1999 v
101v v
100 "
1.000
10.00
100.0
fi 19.99
1.999
199.9
Senslriviey
I
I
vV
v
v*
*The display
indicates
OOO.OV at 200.0 volra input.
The three least significant
digits
will
flash on
and off (blinking
action)
to indicate
an overvoltage
condition.
The display
will
continue
to
read up to f201.7 volts with blinking
action.
Beyond f201.7 "olts
the display
will
indicate
001.7
volts with blinking
action.
I
Valtaae
inputs
,q.reater than f200 volts
are
not r;comm&,ded-since
damage to the instrument may result.
POLARITY
1,
DUMMY
ZERO
-
3 DIGITS
GROUND
DECIMAL--I
FIGURE 4.
0774
Triaxial
Input.
FIGURE 5.
Typical
LOVER-RANGE
Display
on 10 mv Sensitivity.
5
OPERATING INSTRUCTIONS
MODEL 616
b. Automatic
Sensitivity
Operation.
In the AUTO
mode, the Model 616 automatically
selects
the proper sensitivity
in accordance with the following
rules.
1. Upranging.
If the display
reading is between O-l-S-0
and l-9-9-9
and the i""ut
siwal
is increased
beyond l-9-9-9,
the Model 616 automatically
up-ranges
to the next higher
(less
The three least significant
sensitive)
range.
digits
sre blanked during range changing so ss
to prohibit
incarrect
readings
from being disIf the input signal
exceeds t199.9 volts
played.
the display
will
continue
to indicate
up to f201.7
volts but the three least significant
digits
will
flash on and off to indicate
an over voltage
condition.
TO interpret
a reading
an OHMS, COULOMB, or AMPERE
ranges both the digital
display
(with decimal location)
snd the RANGE setti"g(powers
of ten)shauld
be cansidered.
For example, given a digital
reading of 17.32
and a RANGE setting
of 1O-7 AMPERE, the actual
measured value would be interpreted
ss 17.32 x lO-7 ampere.
Since the decimal point is moveable,
it is important
to notice
the position
of the demimal point to determine the full
range of the instrument.
See Table 3-3
for typical
range settings
in the AMPERE function.
Typical
Input
current
TABLE 3-3.
Current Range Settings*
Range
setting
Se"Siti"ity
setting
Digital
Display
2. Down ranging.
If the display
reading is
~at least O-I-S-O and the input signal
is decreased,
the Model 616 automatically
down ranges to the next
lower (mare sensitive)
range.
C. Remote Sensitivity
Selection.
When the Model
616 is used with the Model 6162 Isolaced
0uc"utl
.
Control,
the 616's voltage
sensitivity
may be ceThe output connector
on the rear
merely selected.
panel of the 6162 provides
four isolated
control
lines for the purpase of remote sensitivity
proThe lines are coded as shown in Table
gr*""i.*g.
3-2.
The 616's front panel SENSITIVITY switch
must be set t" AUTO position.
TABLE 3-2.
Remote sensitivity
Programmi"g
Sensitivity
Logic
Control
Lines
K4
R2
Kl
",
1
1
1
:
0
1
1
:
&CR*
I
.01000
.lOOO
1.000
10.00
100.0
"
v
”
v
"
I:
:
0
0'
1
*NOTE
The Manual Range line MR is used to defeat
the automatic
sensitivity
feature.
When MR
is open, the 616 returns
to s"tomatic
operatian.
Logic 1 - open, Iogic 0 = closure
to
ground.
3-5.
PO" TO SELECT RANGE ON OHMS, COULOMB, AND AMPERE.
The front panel KANGE switch (SlOl) provides
selection
of four functions,
VOLT, OHMS, COULOMB, and AMPERE as
described
in paragraph
3-3.
For each function,
a wide
selection
of ranges is provided;
8 ranges on OHMS, 4
ranges "n COULOMB, and 11 ranges on AMPERE. Since
the SENSITIVITY switch is used in conjunction
with
the RANGE Switch,
the actual number of usesble spans
is 12 decades on OHMS, 8 decades an COULOMB, and 11
on AMPERE.
NOTE (ON AMPERE FUNCTIONl
On the 10qlA t" 10~4A ranges,
the voltage
beveloped must not exceed 2 volts,
otherwise,
overheating
of s range resistor
could result.
As s result,
the 10 Volt and 100 volt
sensitivity
settings
ate not recommended for lo-l1\
to 1O-4A ranges.
6
*The current
reading is interpreted
by multiplying
the
display
reading
times the range setting.
Other cucrents not show" can be measured by selecting
the
sppr"priste
RANGE switch setting
in decade steps from
lo-1'A
to lo-lA.
3-6.
HOW TO MEASURE VOLTAGE. The Model 616 can be
used to measure voltages
from ilO microvolts
to i200
volts.
Although
the Model 616 is useable as a general purpose digital
voltmeter,
it has certain
characteristics
which enable reliable
meas"rement~
from
very-high
source resistsnces.
When used in the VOLT
mods, the M el 616 has B" input resistance
greater
than 2 x 10%.
As a result,
the loading
of the
source circuitry
is relatively
insignificant
when
compared to typical
digital
voltme-cers
having LOS
ohms input resistance.
The Model 616 has 20 picofarads of shunt capacitance
(not including
the input
cable capacitance),
since a large *"o""t
Of capacitance causes a slowing of response,
the input capacity ,shauld be kept 8s small as possible.
a. Measurements From Very High Source Resistance.
TO "se the Model 616 as a voltmeter,
set the front
pane1 controls
as follows:
-RANGE
SENSITIVITY -FAST/NORMAL --
VOLT
AUTO
NOW
Connect a Model 6011 Triax Cable (or other shielded
triaxial
cable)
to the INPUT receptacle.
Keep cable
length as short as possible
to reduce the slowing
effects
of cable capacitance.
The ser" control
may
need occasional
adjustment
to reduce any voltage
offset
which msy occur due to temperature
variations.
To resero
the Model 616, set the ZERO CHECK switch
to CHECK position
and adjust
the front panel ZERO
control
for a O-O-O-O display.
The Model 616 pravides a direct
reading voltage
display
with automatic
decimal point position
and polarity.
0476
OPERATING INSTRUCTIONS
i
I
---------_
SOURCE
ERROR DUE TO CIRCUIT LOADING
100 R
% ERROR =
R + RIN
b. Measurements From Low source Resist.a”ce.
TO
"se the Model 616 for voltage
measurements from low
~our'ce resistances,
set the RANGE switch to the lo-l1
AMPERE position.
In this mode, the Model 616 input
resistance
is reduced to 1011 ohms; as a result
the
electrometer
will
be lees sensitive
to electrical
noise pickup and input cable vibration.
Voltage
measurements can be made by following
the same
procedure
given in paragraph
3-6a.
The Model 616
can be used with the RANGE eet et any position
between 10-11 AMPERE to 10-l AMPERE.
The Model 616
input resisLence
can be determined
by taking the
reciprocal
of the AMPERE setting.
Significant
loading error may result
if the input reeisrsnce
18
reduced to less than 100x the source resistance.
C. Measuremenrs Above 200 Volts.
The Model 616
can be used with accessory
divider
probes to measure
voltages
up to 30 kilovolts.
Range muse be set to VOLT.
1. Model 6102A Divider
Probe (1O:l).
This
accessory extends the voltage
mesauring capability
of the Model 616 to 1000 volts.
The inpa
resistance is lOlo ohms. The divider
accuracy is +4%
to 1000 volts.
(To use the Model 6102A en acceeeory Model 6012 Adapter is needed LO mete the triaxial input with the UHF connector
a" the probe.)
2. Model 6601A Divider
(1OO:l).
This accessory
extends the voltage
measuring capability
of the
Model 616 to 5000 volts.
The input resistance
is
lo7 ohms. The divider
accuracy ia +0.01X.
3. Model 6103A Divider
Probe (1OOO:l).
This
accessory
extends the voltage
measuring capability
of the Model 616 to 30 kilovolts.
The input reThe divider
accuracy is
sistance
is 10" ohma.
f5% to 30 kilovolta.
(To uee the Model 6103A
an accessory Model 6012 Adapter ie needed to mate
the triaxial
input with the "HP connector
on the
probe.)
1175
I
-----------------’
ELECTI(OMETER
The Model 616 may exhibit
a large amount of
zero offset
or drift
immediately
after
an
overload
or e long period of storage.
I"
addition,
the offset
current
may exceed the
specification
for a short time until
the
Model 616 ia sufficiently
stabilized.
Although
the offset
current
of the Model 616
is well below offset
found in conventional
voltmeters,
the effects
of the offset
current
charging
the input capscitance
may be "ociced
when the input is open.
"se the ZERO CHECK
switch to discharge
the offset
charge.
The Model 616 should "ot be operated with circuit low fleeting
by greater
than 1000 volta
with respect
to chassis ground.
If the Model
616 is to be used with circuit
low floating
make certain
that no connection
is made between the LOW and GROUNDterminals
o" the
rear panel.
Do not connect a grounded recorder or other instrument
to the Xl or 1V
outpute when the Model 616 is floated.
d. Voltage Measurements in FAST Mode. when the
FAST/NORMAL Switch is eet to FAST, the Model 616 is
connected in a "FEEDBACK" amplifier
configuration.
In this configuration,
the Model 616 requires
special
connectians.
To measure voltage,
co~ect
the eource
between input HI and GUARD. A" easy way to accomplish this connection
ie Lo connect the link
(on the
rear panel) between "GUARD" (blue terminal)
and
"GROUND" (green terminal).
Then uee the rriaxial
cable far input connectione
with the input voltage
applied
between the "red" clip lead and the "green"
clip lead.
NOTE
In this special
voltage
connection,
the LO
input (black clip lead) is "of used since
the voltage
amplifier
Configuration
has bee"
changed.
7
MODEL 616
OPERATING INSTRUCTIONS
c------c-c------c--
l
R
i
I
II--,
I
;
I
-
------F---------------F---------ll
I
MEASURING
MXASURING
POINTS
I
I
T
:
_I’
L --WC---SOURCE
L1-__------------!
ELECTROMETER
” = I x Rm
P1G"P.E 7.
PICURE
operation
HOW To MEASURE CURRENT. The Model 616 can be
3-7.
wed to measure currents
from *lo-15 ampere to 200
Although
the Model 616 is useable a8
mill***peres.
a general purpose picoammerer,
it has certain
characteristics
which enable reliable
measurements of very
small current8
with fast response.
(Use FAST
a. Normal Mode Current Measurements.
mode for current
below lo-5A.)
I" this mode, the
Model 616 measures current
"ver a wide range.
When
the FAST/NORMAL switch is set to NORMAL, the Model
616 operates
as a shunt-type
picaammeter
in which a
resistor
is connected directly
across the input terThe Model 616 measures the voltage
drop
minals.
acro.m the shunt resistors
where VIN - IIN x RS.
This method of measurement is typical
of 'mast multimeter current
measuring techniques.
To use the Model
616 as a shunt-type
pidoammeter,
eat the front panel
controls
*s fallows:
RANGE
-- 10-5 AMPERE (or appropriate
SENSITIVITY -PAST/NORMAL --
range)
AUTO
NORMAL
As A" hater
in NORMALMode.
The Model 616 may exhibit
a large em"u"t of
zero offset
or drift
immediately
after
a"
overload
or a long period of storage.
I"
addition,
the offset
current
may exceed the
specification
far a short time until
the
Model 616 is sufficiently
stabilized.
Although the offset
current
of the Model 616
is well below offset
found in conventional
voltmeters,
the effects
of the offset
current
charging
the input capacitance
may be noticed
when the input is open.
Use the ZERO CHECK
switch to discharge
the offset
charge.
Do not use the 10 volt and 100 volt aensitivity
settings
for RANG? switch settings
of LO-~, 10e2, 10v3, and 10e4 ampere.
If
the voltage
ekeeds~2
volts
on these ranges,
averheating
of the resistors
could result
with subsequent
degradation
of accuracy in
the AMPERE mode.
-NOTE
Full range is determined
by the
sensitivity
setting
and the AMPERE
range setting.
Connect a Model 6011 Triax Cable (or other shielded
eriaxial
cable) to the INPUT receptacle.
Keep cable
length as short as possible
to reduce the slowing
effects
of cable capacitance.
The zero control
may
need occasional
adjustment
to reduce any voltage
offset
which may occur due to temperature
variations.
To rezer"
the Model 616, set the ZERO CHECK switch
to CHECK position
and adjust
the front panel Zero
control
for a O-O-O-O display.
0476
MODEL 616
OPERATING INSTRUCTIONS
(Useable for
b. Fast Mode C rrent Measurements.
currents
from 10 -s A and smeller.)
In this mode, the
Model 616 measures very amall currents
with fas;
response.
When the FAST/NORMAL switch is set to
FAST, the Model 616 operates
as a feedback-type
picaammeter
in which the current
flows through the
feedback resistor
of the voltage
amplifier.
The
Model 616 indicates
the voltage
developed across
the range resistor
where VF = I
Es: ~~p0~8*since
method of measurement provides
the effect
of the input capacitance
from lengthy
To use the Model 616 as a
cables is diminished.
feedback-type
picoammerer,
set the front panel
controls
*s follows:
-- lo-l1
AMPERE
RANGE
SENSITIVITY -- AUTO
FAST/NORMAL -- FAST
the appropriate
range multiplier
should be selected
with a one volt full
scale sensitivity.
The use of
the Model 616 in the FAST made enables measurements
of very small currents
while reducing
the source
loading and input RC time constant.
Since the range
resistor
is connected in the feedback of the voltage amplifier,
the effective
input resistance
is
determined
by the open-loop
gain where SIN = RF t A.
(The value of A is typically
10,000.)
Another advantage of the feedback mode is the reduced effect
of input capacitance
since the input SC time copstant is decreased by the gain A (RCeFpECTIVE = RC i
As a result,
the measurement speed is governed
A).
by the feedback time constant which is a function
of the feedback resistor
and stray capacitance
acT088
the resistor
(usually
a few pF).
Thus, when comparing shunt versus feedback modes, it is evident
that
the feedback measurement offers
superior
performance
for most applications.
Connect a Model 6011 Triax cable (or other shielded
The zero
triaxial
cable) to the INPUT receptacle.
control
may need occasional
adjustment
to reduce any
voltage
offset
which may occur due to temperature
To rezero the Model 616, set the ZERO
"S.***t*O~S.
CHECK switch to CHECK position
and adjust the front
panel ZERO control
for a O-O-O-O display.
TABLE 3-4.
HOW TO SELECT APPROPRIATE AMPERES RANGE.
urrent
To
a Measured
The Model 616 may exhibit
a large amount of
zero offset
or drift
immediately
after an
overload
or a long period of storage.
In
addition,
the offset
current
may exceed the
specificarion
far a short time until
the
Model 616 is sufficiently
stabilized.
Although the offset
current
of the Model 616
is well below offset
found in conventional
voltmeters,
the effects
of the offset
current
charging
the input capacitance
may be hoticed
when the input is open.
Use the ZERO CHECK
switch to discharge
the offset
charge.
Measuring
C&rent.
When
2)
Considerafions~When
using the Model 616 in either
the NORMAL or FAST
nodes, there are certain
considerations
which ensure
In general,
it is advantageous
optimum performance.
to use the smallest
possible
value of shunt resisFir*t,
small value resistance for a picoammeter.
tors are of higher quality
compared to large values
with respect
to accuracy,
time stability,
temperature. and voltage
coefficient,
Second, ideal picoammeters require
very small input resistance
so that
source loading
does not affect
the overall
accuracy
Since the input resistance
of the measurement.
in a shunt picoammeter
is determined
by the range
resistor,
the RANGE multiplier
should be set at the
lowest value.
Third,
the use of a low value resistor reduces the input RC time constant
and results
Harever,
since noise and zero
ln faster
response.
irift
become more significant
when the voltage
unplifier
sensitivity
is set to 10 or 100 millivolts,
3476
lo-15A
10-14A
lO:;;A
10
A
;;I:~
LO-'
LO-'
lO-7
10-6
1O-5
1O-4
lO-3
1O-2
10-l
A
A
A
A
A
A
A
A
A
,ppropriate
Range
Setting
Appropriate
Sensitivity
Setting
10-11
10 In"
10 In"
10 mv
100 mv
1"
1v
1v
1"
1v
1v
1v
1v
1v
1v
1v
g:::
10-11
$"
10-e
10-7
lo-6
10-5
10-4
10-3
10-2
10-l
.OOOlO x lo-1lA
.OOlOO x 10-llA
:;;;p,xl;";:';
;:g;
: ;$
;
1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.000
x
x
x
x
x
x
x
x
x
A
A
A
A
A
A
A
lo-'
lO-8
lO-7
lo-6
10-S
10-4
1O-3
1O-2
10-l
A
A
-NOTE
The we of the FAST mode for current
measurements
is subject
to certain
restrictions
ae follars:
1. The range resistor
value should not be
greater
than the source resistance,
otherwise
feedback division
results
in zero instability
the output.
at
2. The largest
value of current
measured
should not exceed 10e5 ampere, otherwise
the
full
feedback current
cannot be developed.
The NORMAL mode should be used for currents
from 200 mA to 10-4A.
9
MODEL 616
OPERATING INSTRUCTIONS
.--------------m-w.
r---------m
-1
I
I
I%
INPUT
I
MEASURING
L---,---
I ..----,---,I
------
--,I
ELECTROMETER
SOURCE
" = I x Rx
FIGURE
9.
Operation
As An Obrmneter in NORMALMade
3-8.
HOW TO MEASURE RESISTANCE. The Model 616 can
be used to measure resistance
from 1 ohm to 2 x 1014
ohms. Although
the Model 616 is useable as a general
purpose ohmeter, it has certain
characteristics
which enable reliable
measurements of very large
resiseances
with fast response.
Up to 250 volts
CAUTION
may be present
at cerminale.
a. Normal Mode Ohms Measurements.
In this mode, the
Model 616 measures resistance
over a wide range.
The
use of the NORMAL mode is recommended for measurements
up to 1O'l ohms (use the FAST mode for larger
resistallces).
The Model 616 uses a constant
current
method
for measuring resistance.
There, the digital
readout
16 proportional
to the voltage
developed across the
input terminals.where
V = I x R (the current
I is
selected
in decade steps using the RANGE Switch).
To
use the Model 616 as an ohmmeter, sac the front panel
controls
88 follows:
-- 105 OHMS (or other appropriate
range)
RANGE
SENSITIVITY -- AUTO
FAST/NORMAL -- NORMAL
TABLE 3-5.
HO" TO SELECT APPROPRIATE ONMS RANGE.
e***t**ce
to
be Measured
14
lOl$
1012n
IOllQ
$0;
109
108
10'
106
lo5
104
103
lo2
10
0
n
n
n
n
n
n
n
Lppropriate
Range
Setting
b. Fast Mode Ohms Measurement.
In this mode, the
Model 616 meaeures very large resistancea
with fast
onse (use this mode for resistances
larger
than
y$a ohms).
When the FAST/NORMAL switch is set to
FAST, the unknown resistance
(Rx)
is floating
with respect
to the low side of the voltage
amplifier.
The unknown resistor
is connected across the
feedback so as to reduce the effects
of capacitance
and therefore
speed up the measuring time.
TO use
the Model 616 for FAST ohmmeter measurements,
see
the front panel controls
as follows:
RANGE
-- 1012 OHMS
SENSITIVITY -- AUTO
FAST/NORMAL -- FAST
;;::
1012
1011
1010
109
108
107
106
lo5
105
105
105
Connect a Model 6011 Triax cable (or other shielded
triaxial
cable) to the INPUT recept&le.
Keep cable
length as short as possible
to reduce,the
slowing
effects
of cable capacitance.
The zero control
may
need occasional
adjustment
to reduce any voleage
offset
which may occur due to the temperature
"ariathl*.
To rezero the Model 616, set the ZERO CHECK
switch t-0 CHECK position
and adJust the front panel
ZERO control
for a O-O-O-O display.
Connect the unknown resistance
GUARD (on the rear panel).
1v
1 "
1 v
1v
1v
1v
1 "
1.000
1.000
11.000
1.000
1.000
1.000
.I"""
x
x
x
x
x
x
x
loL"n
log n
10: n I
10' n
106 n
105 n
104 n
x 1030
x 1o‘al
When the
urements,
nected in
amplifier.
floating
between
input
HI and
FAST mode is used for resistance
measthe unknown resistance
sample is confeedback around the electrometer
Therefore
the resistance
must be
and not referenced
to LO.
0476
,m-----------
r---------1
CHARGE
I
'
I
TRANSFER--t,
I
n
I
+
%/
I
b---m-----?
INPUT
I
i
MEASURING
POINTS
I
I
I
I
,
-----,
&
I
,Lc
I
.-.------------____,
I
ELECTROMETER
SOURCE
v = l/C
3-v.
HOW TO MEASURE CHARGE.
The Model
616 can be
used LO measure charge by means of a current
integration
technique.
"hen the Model 616 is set to
anyone
of
the
4 coulomb
ranges,
an accurately
known
capacitor
is connected in the feedback loop of the
voltage
amplifier
so chat the voltage
developed is
~oportional
to the integral
of current
where V =
'C or V = l/Ciidt.
To use the Model 616 as a coulombmeter, 8et the front panel controls
as follows:
RANGE
-- 10-10 COULOMB
SENSITIVITY -- AUTO
FAST/NORMAL -- PAST
Connect a Model 6011 Triax cable ("r other shielded
Lriaxial
cable) to the INPUT receptacle.
Keep cable
length a8 short as possible
to reduce the slowing
effects
of cable capacitance.
The zero control
may
need occasional
adjustment
to reduce any voltage
offset
which may occur due to the temperature
variatiO"S.
To rezer"
the Model 616, set rhe ZERO CHECK
Switch t" CHECK position
and adjust
the front panel
ZERO control
for a O-O-O-O display.
-NOTE
The input offset
current
of the Model 616
contributes
a charge of 5 x lo-15 coulomb
per second and should be subtractedfrom
the actual
reading.
The Model 616 can also be used with accessory Models 2501 or 2503 for measurement af
static
charge 0" a dielectric
surface.
A
discussion
of static
charge measurement is
given in secrion
3-lla.
For m"re information
about Static
Charge
Measurements,
request
the Keichley
PrOduct
Notes entitled
"Electrometer
Static
Charge
Measurements”.
1476
/i
dt
3-10.
HOW TO "SE AS A CURRENT SOURCE. The Model 616
can be used as a current
.s"urce for currents
in decade increments
from 10-5A t" lo-12A.
TO select
current,
set Model 616 to OHMS function.
set OHMS range
to the appropriate
position
as show" in Table 3-6.
"se NORMAL mode for currents
up to lo-loA,
and FAST
made above lo-loA.
TABLE 3-6.
' Current
Desired
lo-=A
lo-"A
10-lOA
lo-' A
10-S A
1O-7 A
1O-6 A
lo+ A
OHMS Range
12
1011n
$10;
IO9
1oS
107
106
lo5
n
n
R
n
R
When input to Model 616 is not connected,
set Zero Check Switch t" CHECK. If no inp"f connection
is made a large voltage
(up to ZOOV) can appear across the input.
3-11. ALTERNATE MEASUREMENTS. The Model 616 can
also be used with Keithley
accessories
which extend the measuring capabilities
of the electrometer.
Charge Measwement~.
The Model 616
a. Static
can be used with Models 2501 or 2503 Static
Detector
Probes far measurement of static
charge on a dielectric surface.
When using this method, the Model 616
is operated
as a voltmeter
with a reading directly
in volts.
(Do not attempt
t" measure static
charge
with the Model 616 in the COULOMBmode.)
11
MODEL 616
OPERATING INSTRUCTIONS
7’
L,
1
FIGURE 11.
INull
Method far
Current
Measurement.
b. Null Method for Current Measurements.
The
Model 616 can be used with a" accurate
current
source such as Keithley
Model 261 t" measure
small variations
of current.
When using this method,
the Model 616 is operated
BB a current
null detector
source should be adin the FAST mode. The current
justed
to obtain a null reading
"n the Model 616
(the electrometer
shauld be set t" a" appropriate
range and sensitivity
depending on the magnitude of
current
variation).
I
Volt-Ammeter
Resistance
Method.
C. volt-Ameter
Resistance
Measurements.
The
Model 616 can be used with a" accurate
voltage
source such as Keithley
Models 240A, 244, 245, or
246. When using this method, the Model 616 is
operated
as a picaammeter
so that the current
through the unknown resistance
is measured by the
The resistance
is then calculated
iz 1
electrometer.
terms of the knaun voltage
impressed and the resultant
current
measured "n the electrometer.
1 " OUTPUT = FULL RANGE INPUT
LO+--l--sJ
i LINK
CASE
VC;;SE
FIGURE 14.
HO" TO "SE ANALOG OUTPUTS. The Model 616
3-12.
provides
several
outputs
far monitoring
a" analog
signal.
a. Xl Output (Unity Gain).
This ""tput
can be
used for monitorina
the input sinnal
in applications
requiring
a buffer-amplifi&.
1. NORMALMODE. In the NORMALMODE, the signal
at the Xl OUTPUT (with respect
to LO) is equal to
the input within
20 bpm at dc.
The Xl OUTPUT can
deliver
up tcJ 1 milliampere
for Outputs up to 200
volts.
2. FAST MODE. In the FAST MODE, the X1 OUTPUT
terminal
is connected t" input LO. For unity
gain
applications
when inFAST mode the GUARD terminal
Typical
rise times for various
should be used.
current
ranges is show" in Table 3-7.
This data
*a representative
of instrument
respanse for unity
gain operation.
12
"se
of 1V Recorder
Output.
TABLE 3-7.
:sponse at GUARD (Unity Cain) OUTPUT for
Range
setting
..
*'ryplcal
1*strume*t
to unit).
Rise
Time
perrormance
Fast Curre"
lo-90%
<may vary
tr"m
unit
pravides
a 1 volt
b. 1 VOLT OUTPUT. This "utput
analog Output at up to,1 milliampere
corresponding
to * full
scale input.
0774
MODEL 616
3-13.
OPERATING INSTRUCTIONS
HOWTO USE MODEL 6162.
The Model 6162 Isolated
Output/Control
8. General.
provides
isolated
BCD outputs,
remote controls,
and
remate pragramming lines for systems we of the Model
616. The Made1 6162 has 32 bite of meaeurement infarmatian
provided
in parallel
format.
Strobe lines
permit data transfer
in 4 bit multiples
which are
compatible
with 8, 12, or 16-bit
data eyeterns.
Strobing
of the “open collector”
wtpute
also permit
multiplexing
of data from 2 or more 6162’8 an e
Print rate can be adjusted
from
single
data bus.
l/5 second to 7 seconds per reading to permit a wanefer rate compatible
with the speed of measurement
Isolated
Remote Conend/or the acquigition
system.
trole are provided
for Zero Check, Sensitivity,
Dfsplay Hold, Output Hold, ae well ae Strobe.
The 616’s
low to chessis ground ie018tion
is maintained
by the
6162 (greater
than lolo ohms).
Digital
w&put lcw
is also isolated
from chassis ,ground by 10 ahme.
b. Installation.
a separate
3-l/2
in.
be used on the bench
mounted side-by-side
using rack hardware
The 6162 circuitry
is housed in
*e can
high half-rack
chassis.
adjacent
to the 616 or reck
in a standard
19 inch rack width
provided
(Model 1007).
Position
the Model 6162 on
1. Bench Mounting.
the left
side of the Model 616 as shown in Figure
19 since the intercanneoring
cable has been desighed to mate with the 616 in this configuration
Remove the “side dress” panels (Item 11) on
only.
the sides which are adjacent.
Loqeen the socket
head screw
(Item 24) and elide the panqle to the
rear of the instruments.
After both panels are
remaved install
the “mounting
clamp” (Item 23)
FIGURE 16.
Dual Rack Mwnting
FIGURE 15.
Front
Panel
af Model 6162.
using the original
hardware.
Remove two ecrewe
on one of the instruments
and insert
the mounting
clamp behind the corner bracket
ae shown in Figure
17. Replace and tighten
the two ecrewe to hold
Next, insert
the open part of
the clamp in place.
the clamp behind the corner bracket
on the second
i*stTXlE*t.
Attach a l-l/L?”
long Phillips
head
ecrew (Item 25) and kepnut (Item 26) to secure the
two instruments
together.
2. Rack Mounting.
Proceed 88 described
in the
above paragraph
for bench mounting.
The,, attach a,,
“angle bracket”
(Item 21) on each instrument
using
hardware (Item 22) in place of original
hardware.
The battam corner feet and tilt
bail assemblies
may be removed if necessary.
The original
hardware, side dress panels,
feet and tilt
bail aeeemblies should be retained
for future conversion
back
to bench mounting.
Ueing
Model 1007 Hardwarr.
OPERATING INSTRUCTIONS
MODEL f
FIGURE 17.
Rear Panel
of Model 616 and 6162.
c. Connections.
A single
prewired
cable plugs
into the 616's chassis to provide
all necessary
communication
between units.
To install
the cable,
remove the 616's top cover, place rubber grommet
within
the rear panel slot,
insert
cable,
and plug
the three mini-connectors
into their
respective
pc-board locations
as shown in Figure 19. A separate
50-pin AMP type 205211-l connector
provides
isolated
outputa and control
lines.
A mating 50-pin connector
is furnished
with the 6162 (Keithley
Pare No. CS-271).
e. Summary of Digital
Information.
Table 3-10
identifies
the data lines available
et the 6162
output connector.
The data ia grouped in 4-bit
bytes with a corresponding
Strobe line.
The strob
(or enable) line permits serial
data transfer
from
a single
6162 or multiplexing
of the data output o
a number of 6162's anta a common data bus.
Conven
tianal
parallel
data transfer
is obtained when all
strobe lines are at Logic "0" (closure
to output L
within
0.5 volt).
d. Power Requirements.
The 6162 is powered from
50-60Hz line voltage
and has a separate
power switch
and fuse. Line voltage
is selected
using the rear
panel switch.
Fuse type is 3AG SLO-BLO, l/SA.
f.
Print Rate.
The basic 616 has a reading rat
of 5 readings
per second.
The front panel RATE
control
on the 6162 varies
the print
rate in l/5
second increments.
INTEKCONNECTION CABLE
REAR PANEL MODEL 6162
10
CONNECTOR
PIN B ON THIS CONNECTOR
IS OPEN (NO CONNECTION)
10 PIN CONNECTOR
PIN ., ON THIS CONNECTOR
IS OPEN (NO CONNECTION)
5 PIN
10
CONNECTOR
PIN C ON THIS CONNECTOR
IS OPEN (NO CONNECTION)
CONNECTOR
10 PIN CONNECTOR
IS OPEN (NO CONNECTION)
FIGURE 18.
14
Diagram
of Interconnection
Cable
Between 616 end 6162.
05
MODEL 616
OPER&NG
TABLE
SPECIFICATIONS;
IIGITAL OUTPUT: BCD (8421) open collector
logic represente
each Of 3 digits
(0 = "OOOO"), overrange
digit,
uprange ("O"), palarity
(+ = "l"),
decimal
position
(5 lines),
exponent
(5 line,
BCD), exponent polarity
(+ = "I"),
downrange ("O"),
zero check
("I"),
and function
(2 bit code).
with respect
to 616 display
(erCCURACY: fl digit
quiva1ent
to
0.1%
of
range).
QAG (FLAG):
Logic "1" ("0") from 50 milliseconds
to
7 eeconde depending a" Print Rate setting.
No
change in Digital
Output is made during this interval.
Logic "1" : open collecl"TP"T LOGIC LEVELS: 0"tp"f
ear to autput La. output Logic "0" : closure
to
MC858P or equivalent
output LO. Output Device:
(greeter
than 6V breakdown,
0.5V et +35mA sink).
!S-fOTE CONTROLS:
Zero Check:
Logic "0" act"ates
616 Zero Check.
Sensitivity:
4-line
code far remete eeneitiviey
setting
of 616.
Display
Hold:
Logic "0" retains
last reading on
display
(except polarity).
Logic "0" retains
data from last readOutput Hold:
ing at Digital
output.
Strobe:
8 lines for seriaIizing
in multiples
af 4
Logic "1" inhibits
controlled
output lines.
bite.
Conventional
parallel
data
8.
Da.8 Transfer.
transfer
is accomplished
through parallel
connections
Serobing
with one bit of information
per conductor.
allows data to be grouped into word lengths
(bytes)
appropriate
te the acquisition
device.
thus simplifying the interfacing
between the 6162 and 8, 12, or
._..
lb-tat
devlcee.
when a11 STROBE lines are at Logic
"0". the 6162 data outputs are enabled end ere sveilable in parallel
farm.
Individual
strobe lines may
be used to c~nlect
te e cemmen data bus in multiples
The 6162 "open-collector"
~utpute
of l-bit
words.
are "open" unless the respective
strobe lines ere
at Logic "0".
The uee of "open-callactor"
configuration
allawe the parallel
connection
of 2 or m"re
6162 unite since none of the outputs will
conduct
unless strobed.
The 6162 wtpute
ere TTL and DTL
The "open callectar"
output switches
compatible.
between a high and low impedance level
rather
the"
This permits
the ueer to
specific
voltage
levels.
determine
the voltage
level
defined by logic state
,tl,, . The output "1" etete may be selected
fram any
voltage
over the range of +2 and +12 volts.
The "0"
state is 0.5V et +35 m.4 (maximum)sink
current.
h. Word Sequence.
The pa,rticular
sequence in
which the worda appear in serial
data transfer
is
determined
by the way the "STROBE" lines are grouped
and the order of ectiveti"",
in addition
to the
wiring
of the data blocks.
i.
Control
Features.
1. Flag (m.
This eutp~t provides
a lagic
level which ce" be used to indicate
the proper
time interval
for transfer
of data.
A logic "1"
~ccure from 50 milliseconds
ta 7 seconds depending
1175
INSTRUCTIONS
3-8.
MODEL 6162
CONTROL LOGIC LEVELS: Logic "1" = either
a" open
circuit
or a voltage
between +2 and +12 volta reference to autput LO. Logic "0" E closure
to ouep"f Lo within
0.5 volt while sinking
2.5 milliamperes.
PRINT RATE: Variable
via front panel control
from
l/5 second per reading
to 7 seconds per reading in
l/5 second increments.
ISOLATION:
Input LO to output Lo: sufficient
to
maintain
616 isolation
specifications
except adds
200 picofarads
capacitance.
Output Lo to chassis
ground:
greater
than lo* ohms shunted by 0.1 micrc
farad.
Input may be floated
up to flOO0 volts with
respect
t0 chassis grand.
Output Lo may be flaated up t" tlO0 volts with respect
LO chassis ground.
CONNECTORS: Input:
Attached
cable cennecte a, 616.
Output:
50-piq AMP type 205211-l.
Mating co""ectar supplied.
ENVIRONMENT: Operating:
10°C t0 5ov,
0% to 70% relative
humidity.
Storage:
O'C to 70"~.
POWER:
90-125 or 180-250 volts
(switch selected),
50-60 Hz, 9 watts.
DIMENSIONS, "EIGHT:
Style M 3-l/2
in. half-rack,
overall
bench size 4 in. high x B-314 in. wide x
15-314 in. deep (100 x 220 x 400 mm). Net weight,
7 pounds (3,2 kg).
ACCESSORIES SUPPLIED: Model 1007 Dual Rack Ma,neing
Kit.
on the Print Rate contra1 setting.
Na change in
the Digital
Output is made during this interval.
On some digital
devices,
it may be necessary - to
trigger
off the leading
edge of the Flag or Flag
waveform by differentiating
or other wave shaping.
This control
line retains
the
2. Display
Hold.
last reading
on the display
(except polarity)
when
closure
is made te digital
LO (Pi" 4).
Neither
the
a/d conversion
"ar digits1
wtput
ere affected
by
fhie control.
3. Output Hold.
last reading et the
made to digital
LO
veraia"
nor digital
control.
This control
line retains
the
Digital
Output when closure
is
(Pin 4).
Neither
the a/d condisplay
ere affected
by this
4. Zero Check.
This contra1 line e&uetee
the
616's zero check solenoid
to permit monitoring
of
the electrometer
amplifier
offset.
When the line
ia released
(Logic "1") the 616 returns
te "o-1
operating
canfigl+ti0n.
~The front panel ZERO
CHECK awitch muet be set te OFF position
te penoit
remote zero check control.
j.
Remote Programming.
Remote lines ere provided
at the 50-vi"
connector
to Kermit rem"te selection
of se"sit&ty
over five decedes.
When the 616's
the
SENSITIVITY Switch is eet to AUTO position,
seneitivity
may be remotely
programmed or allared
to function
automaticslly.
When the MANUAL RANGE
line on the 6162 is et Logical
"0" the coded range
lines are enabled,
and the LSI range linea ere
disabled.
15
MODEL 616
OPERATING INSTRUCTIONS
TABLE 3-9.
Cross-Reference
for Digital
N8”e
Strobe
I
Ul
I
Fl
F2
EXP POL
EXP 1 x lo1
t
Buffer
Control
Buffer control
Data 111
x
x
x
x
10'
100
100
10'
17
12
11
16
FLAG
FLAG
27
10
Timing
Timing
OUtput
Output
Strobe 88
Zero Check
1 x 103
POLARITY
DPl
"0" (10 mv range)
20
13
21
43
4:
Buffer Control
Indication
overrange
output
Logic "1" - +
.ooooo10 m"
Dummy Zero
Strobe
39
Buffer
#7
- +
Used on OHMS, AMPERE,
COULOMBranges
1
2
4
8
Co"rrol
Coded function
lines
See Table 3-12
"1"
for
1/9
DP2
DP3
DP4
DP5
I
Data 111 (BCD)
t
Buffer control
Data 112
22
5
6
23
Data 112 @CD)
Output
t
Buffer control
Data u3
x
x
x
x
102
102
102
lo2
Strobe
DR
UR
30
25
26
24
#6
19
I
I
a
9
16
Hold
Display
Hold
MANUAL
RANGE
I
100 "V
1 "
10 "
100 "
Digital
2
Remote Control
50
Remote Control
31
32
14
33
3
R2
84
t
Lo
4
Zero Check
15
sensitivity
-See Table
lines
3-13
Ground Reference
Control
Dmm Range
UP Range
FIGURE 19.
.oooo=
o.ooooo.oo=
ooo.o-
are not strobed.
for
Data #3 @CD)
Buffer
Control
for
The following
1
2
4
8
Remarks
Buffer
Strobe
Logic
No.
3
Control
Buffer
48
Pi"
Name
Remarks
Pin No.
0utp"ts.
Identification
of Pins
O" Digital
Output
Remote Control
Connector.
0476
MODEL 616
OPERATING INSTRUCTIONS
TABLE 3-10.
for 50-P*" Co""eCtor
pin-out
Pi"
N,0.
1
Functio"
1%
11
12
ZERO CHECK
81 xx 10"
100
Dsra 111
output
Range Control
Remote Control
Data 01
#I
Strobe
Strobe
Strobe
Buffer
Buffer
Buffer
20
21
22
23
24
25
-1x103~-~
Decimal
Decimal
8 x lo2
2 x 102
Data
tuta
39
41
::
44
45
46
47
48
49
50
Point
Point
Table
34
35
36
37
38
40
113
II3
Truth
/
Function
4 x loL
FLAG ,
4 x 101
2 x 101
I
/
Data 113
I
I
Timing
I
I
0"fpue
Data j2
Data
1 x 102
MAN"AL RANGE
Rl
32
i/4
DP 2 (.looo)*
DP5 (lOO.O)*
26
27
28
29
Control
Control
Conrr&
Data
Name
I
30
31
1
2 x 100
1/5
,,6
It8
1
1 up-range
Timing Ill Outwt
tuta
R2
18
19
Buffer Control
Control
Buffer Control
GND
Decimal Point
Decimal Point
Decimal Point
FLAG
4 x 100
ZERO CHECK
13
14
15
16
17
Pin No.
I
I
Strobe 114
output Hold
Strobe /17
output LO
DP3 (l.ooo)*
DP4 (lo.oo)*
DPl (.OlOOO)*
DR
2
3
4
5
6
7
8
9
10
--.
Name
I
1/z
Data #3
Range Control
Range Control
dP 8 x 10:
EKP 4 x 10"
Strobe 03
EKP 1 x 100
Exe 2 x 100
Strobe #9
"0" (IO "" range)
RKP POL 101
EKP 1 x
POLARITY
Fl
I
oum,ut
output
Buffer
Output
output
Buffer
output
output
output
Output
I
Control
Control
FUnCtiO”
F2~
8 x 101
Func eion
IkIt*
112
1 x 101
Strobe It1
Strobe ,,2
Display
Hold
Data /12
Buffer Control
Buffer Control
Control
TABLE 3-11.
for 8-4-2-l
SCD Code
,
n = 0,1,2,3,
Truth
Function
OHMS
0
0
COULOMB
1
0
0
1
1
1
VOLT
being
rT---!
0
1
decoded.
Truth
F2
AMPERE
on digit
TABLE 3-12.
Table for Function
F1
t--
1175
or 4 depending
1 x 10"
(1st bit)
0
0
0
0
0
0
0
1
2 x 10"
(2nd bit)
4 x 10"
(3rd bit)
8 x 10"
(4th bit)
Decimal
Number
Sensitivffy
.Ol
.Ol
.Ol
.Ol
.l
1.
10.
100.
Table
TABLE 3-13.
for Programmed Sensitivity
MWl”81
R*“ge
0
0
0
0
0
0
0
0
R4
R2
Rl
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
17
OPERATING INSTRUCTIONS
MODEL 616
Truth
TABLE 3-14.
Table for Serial
I
I
STR BE 6
9
1
,I
STROBE 7
19
8
Transfer
3
27
10
I
,I
L
4
A
FIGURE 20.
I,8
Suggested
Hook-up
far
0
t
6
Y
C
c
II
Data Lines.
1175
REMOTE
MODEL
616
,
BCD ,
MODEL
6162
A \+1 ‘-IS~o$~;ON-’
ISOLATION
lo’“cL, 1ooov
1lOOV
\1
DIGITAL
SYSTEM
A’1
ISOLATION
lo%, 1oov
A
:
FIGURE 21.
I
flack
diagram
2016 COUNTS
"COUNT NOW"
of 61616162
System.
2016 COUNTS
"COUNT NOW"
I
t5V
"CN"
16 A-O SIGNALOV
+5v
BUFFER
STORE OV
+5v
(DELAY) Ov
+Yl
COUNTER
RESET OV
t5v
FLIP-FLOP
RESET OV
t5V
FLAG
ov
I
I
;
;
I
I
I
I
I
I
I
I
I
I
I
HOLD activated
and deactivated
on the rising
edge of "CN" tmmediately
following
application
of user's
"HOLD"
signal.
NOTE: The hold command is activated
(or deactivated)
on the rising
edge of "CN".
This means that when the
user applies
the "HOLD" signal,
the "HOLD" will
not became effective
until
the conversion
in process is
This also means that when the user%leases
the
finished
and the data is stored in the output buffers.
"HOLD" line,
"HOLD" will
not become effective
until
after
the rising
edge of the next "FLAG" signal.
For
this reason, the first
"FLAG" after
"HOLD" is released
should be ignored and the data buffers
will
not be
updated on the first
"FLAG" after
"HOLD" is released.
FIGURE 22.
Timine
Diaeram
for
6162 Oumuts.
MODEL 616
THEORY OF OPERATION
SECTION
4.
THEORY
4-1.
GENERAL. This section
contains
information
to
describe
the “O&l
616 circuit
operation.
The circuicry is located
o” five printed
circuit
boards.
The circuits
are arranged
in functional
modules to
facilitate
troubleshooting
and servicing.
The 616’s
shielded
input section
houses the electrometer
amplifier and range switch.
4-2.
ANALOG CIRCUlTKY
a. Input Amplifier.
This amplifier
A1 is show” in
simplified
form in Figure 24.
(Refer t” schematic
25764E).
The input signal
applied
between HI and LO
(5120) is amplified
by the input MOS-FET amplifier
composed of transistors
Q101A and Q101B. Tranafseors
q102A and Q102B are used for aver-voltage
protection
(base-emitter
connected).
Integrated
circuit
QA101
provides
high gain (approx.
100,000) for the electrometer amplifier
section.
Potentiometer
R123 is a*
internal
zero adjustment
used for calibration
purPOSW. Potentiometer
K119 is a front pane1 ZERO
control
with adj”stme”t
capabilitv
of a~oroximatelv
3 In”.
Transistors
Q105 and QlOk are comp1ementa;y
output stages which provide
a maximum of 1200 volts
at the “Xl” terminal
(Jll8).
The electrometer
amplifier
ia connected in a unity-gain
configuration.
sistance
between HI and LO is greater
than
ohms in “VOLTS” functia”.
IN
INPUT
AMP
OF
OPERATION
b. Shunt (NORMAL) Mode Operation.
(Refer to
In the “NORMA,.” mode, the elecschematic
257643).
trometer
amplifier
is connected as a unity-gain
buffer
amplifier
with a” input resistance
greater
than 2 x 1014 ohms. Input resistance
may be decreased in decade steps from IO11 ohms LO 10 ob,,,s by
selecting
the desired
shudt resistor
a” the AMPERE
positions
of the RANGE switch.
Resistors
RIO1
through Rlll are switched
into the citzuit
shunting
the HI and LO terminals.
The shunt resistor
can“ected in the circuit
is numerically
the reci rocal.
of the AMPERE position
selected
(that is 10 -1% :
10%
resistor).
C. Feedback (FAST) Mode Operation.
(Refer to
schematic
25764E).
In the “FAST” mode, the electrometer amplifier
is connected in a feedback amplifier
configuration.
I” AMPERE, CO”LOMB, or OHMS functions,
the range element (resistor
“r capacitor)
is connected be~wee” HI and GUARD. Input resistance
on AMPERE
function
is determined
by the feedback resistor
and
the open-loop
gain, where:
Ri = RF (K = 50,000
FOT example, on 10-11~ range, R* = 2 x 10611. I*p”t
voltage
drop for full
range in,.~ut current
would be
less than 20 microvoles.
POLAR/TY
-
minimum)
K
DETECTOR
A-D
-
CONVERTOR
i
I
i
11
RANGE
LSI
CHIP
1175
-DRIVERS
-
DISPLAY
21
MODEL 616
THEORY OF OPERATION
(Refer to schematic
d. Zero Check Operation.
The front panel ZERO CHECK switch (5102)
257643).
operates
e relay solenoid
(KlOl) when set to ZERO
CHECK. In the energized
etate (as ahown on the
schematic)
the relay contact
is closed.
The closed
contact
makes e co~ection
between the FET amplifier
illP"f and GUARD (5119) es fallows:
TABLE 4-1.
Voltazxe
In this mode, a connection
is
1. Normal Mode.
made between resistor
R124 and input LO. Notice
that the input HI terminal
is shunted to LO by a
10% resistor
(~112).
is
Fast Mode. In this mode, a connection
made between resistor
R124 and GUARD. Notice
that the input HI terminal
remains connected to
the electrometer
amplifier
input.
Ill AMPERE, OHMS,
or COULOMBfunctiona,
the feedback element is
shorted out so that no voltage
can be generated
across the amplifier
feedback.
2.
remote zero check capability
is provided
when the Model 6162 is connected to the
The connection
at Pll3D is in para616.
llel
with the front panel switch.
The
front panel ZERO CHECK switch should be off
when using the remote zero check feature.
e. Voltage Sensitivity.
This amplifier
A2 is
in Figure 24.
(Refer to schematic
25776D).
The
ond stage variable-gain
amplifier
is composed of
FET stage (Q301A. 4301B) and an ineegrafed
circuit
QA301.
Gain is determined
by resietors
RN301 (A
F) where:
Gain = 3 (See Table
RI
10.00
”
500m
100.0
"
500KO
Gain
50 Kn
5 Kfl
0.1
0.01
RN3OU to RN301F
1. Gain setting.
Resistors
are connected in parallel
combinations
to achieve
On the 10 mV sensitivity
setthe proper gain.
ting,
the gain is determined
by the series
combination
of resistors
RN3OlB and R303. Potentiometer R303 La a calibration
adjustment
for the
10 m" sensitivity
setting.
For each succeeding
sensitivity,
the resistors
are switched into the
circuit
as shown in Table 4-2.
Potentiometer
R304 iB a calibration
adjustment
for the 1OOV
sensitivity
setting.
TABLE 4-2.
Gain Switching
shown
eece
to
IS‘XSiti”itY
.01000v
.lOOO ”
1.000 ”
10.00 V
100.0 "
4-l.)
Feedback
Resistors
Used For Gain Set.
50 Mn (RN301+? + R303)
5 MCI (RN301B + R303//RN301C)
500 K$? (RN301B + R303//RN3OlC//RN3OlD)
50 Kn (RN301B + R303//RN301C//RN301E)
5 KC (All above//RN301F
+ R304)
INPUT
1 VOLT
0
UNITY GAIN
BUFFER
SENSITIVITY
SETTING
LOW 0
0
FIGURE
22
24.
Simplified
Diagram
of Amplifier
Section.
1175
I
MODEL 616
THEORY OF OPERATION
Logic.
(Refer to schematica
2. Gain Selection
A three line ranging code is
25776D, 257788).
The coding
used to determine
voltage
sensitivity.
for the three lines
(R4, R2, Rl) is given in Table
4-3.
TABLE 4-3.
Ranging Logic
3. Zero Adjustment.
internal
zero adjustment
recorder
output.
Potentiometer
R311 is an
for calibrating
the "lv"
f.
Ammeter Operation.
(Refer to schematic
25764E).
In the AMPERE mode, a range resistor
(RlOl through
Rlll)
is connected between input HI and GUARD. The
current-Lo-voltage
conversion
1s determined
by the
following
relationship:
ER = voltage
developed
I - input current
R = range resistor
where 0 = open state
1 = t5v *ate
1175
In the "NORMAL" mode,
equivalent
to
In
drop is a funct "H.on of
ZO!JV). The use of the
ranges 10m5A to lo-llA
considerations.
across
R
the input voltage
drop is
the "FAST" made, the input
open loop gain (typically
FAST mode is limited
to
due to loading and stability
23
THEORY OF OPERATION
FIGURE 27.
Coulombmeter
(Refer to schematic
g
Coulombmeter Operation.
In the COULOMBmode, a range capacitor
257k4E).
(Cl01 through Clll)
is connected between input HI
conversion
is
and GUARD. The charge-to-voltage
determined
by the fallowing
relationship:
EC = $ Ii
- FAST Mode.
TABLE 4-4.
Ohmmeter Divider
Network
Ohms
Range
R
Total
12K
12K
12K
12K
12K
12K
12K
12K
dt -z
EC E voltage
developed
C - range capacitor
Q ,- stored charge
acrow
C
(Refer to schematic
h. Ohmmeter Operation.
In the "OHMS" mode, a current
Llource is
257643).
connected into the electrometer
circuitry.
The
voltage
sensitivity
is selected
as in VOLTS operaThe current
source is composed of a voltage
tion.
source and a series
(RANGE) resistor.
The series
resistor
is selected
in decade steps in the OHMS
position
(resistors
R105 through Rlll).
The voltage source is provided
by dividing
down from a +12
Potentiometer
R114 is an
volt reference
supply.
internal
calibration
adjustment.
FIGURE 28.
24
Configuration
The current
determined
Ohmmeter Configuration
where
R,
1.0101cn
l.OOOK61
1. OOOKQ
1.ooom
1.oooKo
l.OOOKQ
l.OOOKn
100
developed
as follows:
E
-.A&10.990Kn
ll.OOOK
ll.OOOK
ll.OOOK
ll.OOOK
ll.OOOK
ll.OOOK
11.9
K
1.01
1.00
1.00
1.00
1.00
1.00
1.00
0.1
by the ohmmeter circuit
1-E
E = 12 Rl/(Rl+R2)
I = Furrent
in amperes
E - voltage
as in Table 4-4.
R = range resistor
(R105 through
v
v
v
v
"
v
"
"
is
Rlll).
- NORMAL Mode.
1175
MODEL 616
(Refer to
i.
Polarity
Detection
Circuit.
schematic
257760).
This circuit
detects
the
polarity
of the input signal
and triggers
the
polarity
display
circuitry,
ANALOG-TO-DIGITAL CONVERTER. (Refer to
schematics
25776D. 25778B).
The a-to-d converter
operates
on a charge balancing
principle.
The circuit operates
only with unipolar
inputs.
A block
diagram of the converter
is shown in Figure29.
The
positive
output of the polarity
detector
circuit
drives
the integrator
amplifier
QA304 negative.
The
integration
rate is determined
by the input level,
resistors
RN304A and RN304B and capacitor
C308.
As the integrator
goes negative,
the threshold
detector
(amplifier
QA305) output goes to a positive
level.
A positive
level represents
a logic "1" *t
the "J" input of the J-K flip-flop
(the "K*' input
is a logic "0").
The charge and discharge
periods
for the integrator
are determined
by the state of
the Q output on the J-K flip-flop.
When the Q
output Se high, diode QA306 D is back biased off
and the integrator
can only be charged by the
polarity
detector
output.
When the Q output is
low, diode QA306-D is forward biased and discharge
of the integrator
is possible.
Since the Q and Q
states can be changed only when a clack pulse is
present,
the charge/discharge
periods are a function
of the clock frequency.
The a-to-d conversion
cycle
is free-running
and has a timing period of 2016
Counts.
The digital
reading is derived
by counting
clack pulses in the discharge
pkriod.
Far example,
a 1 volt input would result
in a total
count of 1000
One complete conversion
cycle is 2048
clock pulses.
In addition
to the timine wriad
of 2016
counts.
counts,
the remaining
32 counts are needed to stop
the BCD counter,
strobe the ED counter information
into latches,
reset the BCD counter to zero, and
initiate
uprange or downrange (or overrange).
The
conversion
rate is approx. 0.2 sets/conversion
(2048 counts at a 10 kHz clock rate).
4-3.
1. First
Stage Amplifier.
When the input to
OA302 is msitive-noina.
diode
intearated
circuit
D301-conducts
causing the a&ifier
ti op&?ate
with a gain of 2X (inverting).
A negative-going
input to QA302 is not amplified
due to the blocking action of diode D301 which prevents
the output of QA302 from going positive.
Transistor
Q306 conducts to maintain
feedback around QA302
and therefore
provides
polarity
information
co
turn-off
the "minus" polarity.
2.
Second Stage Amplifier.
QA303 is used as an inverting
Far a positive-going
input
tion circuit,
QA303 provides
net output of +lV maximum.
negative-going,
the inputs
provide a net oucpuc of +lV
Integrated
circuit
summing amplifier.
to the polarity
deteca gain of -1 for a
When the input is
to QA303 are summed to
maximum.
Potentiometer
R305 is an in3. Adjustments.
ternal
calibration
control
for adjustment
of
amplifier
zero.
Potentiometer
R307 is an internal
calibration
control
for adjustment
of gain in the
summing amplifier
QA303.
A-D
CONVERTOR
INTEGRATOR
THRESHOLD
DETECT
CLOCK
0
-
,t CL$,L~;T’-------,
I
I
j 9K
*REF
J
K
IEi
I
I
- 9V REF;
’
LSI
W/P
--
MODEL 616
THEORY OF OPER**ION
(Refer to schematic
AUTO-RANGING CIRCUIT.
4-4.
This circuit
is located
on the LSI module
257788).
(QA408) with exception
of decoding diodes D3Ol.A
through D301H and FET switches
Q302 through Q305.
The threshold
input
(TH) and current
switch (CS)
signals
are used to determine
the proper range.
Ranging is bidirectional
so that upranging
or
downranging
to an adjacent
range occurs.
The a"toranging feature
is defeated by grounding
pin 6 (MS)
on LSI QA40S.
I
DISPLAY DRIVE. The 616 display
is composed of
4-5.
four LED, 7-segment readouts plus a polarity/averThe display
drive circuit
is multirange readout.
plexed 80 that only eight lines are driven at a time.
FIGURE 31.
Digital
TABLE
Display
a. Multiplexing
Circuit.
This circuit
is contained
is controlled
by the
in the LSI QA20S. The dieplay
four multiplexing
lines which turn on the anodes of
each seven segment readout.
Four of the lines are
used for each of the four digits.
Polarity,
decimal
point,
and dummy zero (an the .OlOOOV ranple) are not
QA401A through QA4OlD are used
multiplexed.
to provide
sufficient
drive for transistors
Q405
through Q407 respectively.
Each anode of each LED.
readout is pulled up to approx. +lO volts
to light
a particular
digit.
Display.
4-5.
Codi
Fills
Numeral
8
9
decimal
b. Display
Coding.
Each dieplay
module has separate
cathode connections
for each segment as given in Table
4-5.
A,B,C,D,E,F
B.C.
A,B,D,E,G
A,B,CL',G
B.C,F,G
A,C,D,F,G
A,C,D,E,F,G
A,B,C
A,B,C,O,E,F,G
A,B,C,E,F,G
decimal
1,13,10,8,7,2
13,lO
1,13.8,7,11
1,13,10,8,11
13.10.2.11
i,io,S,;,ii
1,10,8,7,2,11
1,13,10
1,13,10,8,7,2,11
1,13,10,7,2,11
6
CS
TH
RANGE
-OUTPUTS
MULTIPLEXER
TO READOUTS
FIGURE 30.
26
Functional
Block
Diagram
of Large
Scale
Integrated
Circuit.
1175
THEORY OF OPERATION
MODEL 616
c.Dacima1
Point (Sensitivity)
Codingl
Three
coded lines are used to generate
the decimal point
The lines are designated
Ri, ;?;, ;;it4;or
drive.
Inverters
QA404A.C.E ,,rovide
B lot c
a corresponding
logic-"0"
stare (&xure
to LO) on
any of the lines.
!&en used in the AUTO mode, a
fourth line
is used to defeat the automatic
rangThe remote enable line (MR) is actiing circuit.
vated "hen a connection
to LO is made at pin 6 (MB)
on LSI OA408. A truth enhle for decimel point logic
is given in Table 4-6.
TABLE 4-6.
Decimal Paint Coding
.01000
.lOOO
1.000
10.00
100.0
B4
%
0
1
1
1
1
x
0
0
1
1
x
0
1
0
1
When the 10 millivolt
e. Dupuny "0" Indication.
range is selected,
the 616 display
indicates
a
fifth
digit
(DN402) and decimal paint.
Transistor
Q402 controls
the cathodes for segments A,B,C,D,F,E
to display
a "0".
Transistor
Q402 is turned off
when R4 is high (QA404A = low).
Polarity
Indication.
is controlled
by eranaistor
Additional
always lighted.
for rhe plus sign.
The polarity
display
DN401
Q401. The minus sign is
segments are turned on
The LSI module (QA40S)
8.
Overload Indication.
contains
additional
circuirrv
for overload
blankine
When the display
exceeds 200 volt:,
of the display.
the circuit
causes a blinking
action
of the three
least significant
digits.
The display
reads properly
up to 201.7 volts
(001.7 max.).
REFERENCE OSCILLATOR. The reference
frequency.
4-6.
(clack)
circuit
is composed of integrated
circuit
QA406 and other fixed components forming a freeThe oscillator
operates
af
running 0scillaP.x.
frequency
of approx.
10 kHz.
The output of rransistar Q411 is a clock pulse between -0.7 volt and +5
volts dc with a 5 microsecond
pulse widrh.
MISCELLANEOUS CIRCUITS USED FOB 6162,
These
4-7.
circuits
are used to generate
signals
or signal
levels
for the Model 6162 Isolaced
Output/Control.
This circuit
is composed of ina. Gated Clock.
verters
OA405D.E.F and NAND eates OA407A.B.C.
The
drcuic
Abi&~'~i~~8l~
fr&
the is1 &&
4
clock to provide
a gated clock "GC".
This signal
and
"CN" are used to generate BCD outputs in the Model
6162.
1175
4-s.
POWERSUPPLIES (Schematic
25777D).
5
d. Overrange Indication.
Overrange is indicated
by diode network DN403. Transistor
Q403 controls
the cathodes for segments A,D,F,E co display
a "0".
When transistor
Q403 is turned off, the display
indicates
a "1" since segments S and C are always
eurned on (pins 10 and 13 are connected to LO).
f.
Decimal Point.
This circuit
is composed of
stages QA405A.B.C which provide
sufficient
for optical
isolators
in the Model 6162.
Depoint is coded in three lines B4. R2, Rl as
in Table 4-6.
a. Primary Power.
The Model 616 can be operated
over two ranges of line voltage.
Switch 5201 haa
two line voltage
positions
a.8 follows:
S*nSitiVity
S*tthg
b.
inverter
drive
cimal
shown
117V:
234V:
9OV - 125V rms range
18OV - 250V rms
Fuse (F201) must be selected
range as follo"s:
117":
234V:
3116 ampere,
l/l0
ampere.
50-60 Hz, 9W
for
each line
voltage
3AG SLO-BLO
3AG SLO-BLO
The Model 616 power supply
b. Secondarv Power.
is composed of four separate
supplies.
Transformer
T201 provides
four center-rapped
secondary windings.
1. i275V Unregulated.
This supply taps a-c
power from secondary windings
l-2-3 of T201.
Diodes
0201 through 0204 form voltage-doubling
supplies.
Outp"t voltage
is approximately
275 volts at 2
milliamperes
(at nominal line voltage).
Ripple is
a,qn-oximately
2 volts peak-to-peak
at no load.
This supply taps n-c power
2. t12" Regulated.
from secondary windings
6-7-S of T201.
0205 is
a four-diode
full-wave
bridge.
Integrated
circuit
QA201 provides
a regulated
f12 volts
at 10 milliamperes.
Ripple is approximately
1 millivolt
peak-to-peak
at nominal loading.
3. -9" Regulated.
This supply also utilizes
D205 for full-wave
rectification.
Zener diode
0206 provides
a regulated
voltage
of -9" at 5
"illi*"peres.
Ripple is approximately
3 millivolts
peak-to-peak.
4. +5V Regulated.
This supply caps a-c power
from secondary windings
9-10-U
of TZO1. Diodes
0207 and 0208 form a full-wave
rectifier.
I"t*grated circuit
QA203 provides
a regulated
output
of +5 volts
at 200 milliamperes.
Ripple is spproximarely
1 millivolt
peak-to-peak.
This supply utilizes
the
5. +lOV "nregulaced.
unregulated
outpuf of the full-wave
rectifier
0207DZOS. Ripple is approximately
1 volt peak-to-peak
at 200 milliampere
loading.
This supply taps a-c power
6. -12V Regulated.
from secondary windings
13-14-15 of T201.
Diodes
D209 and D210 form a full-wave
rectifier.
Incegrated circuit
QA202 is a regulator
element.
Transistor
Q201 is a series-pass
regulator.
Output voltage
is -12V at 50 milliamperes.
Ripple
is approximately
2 millivolts
peak-to-peak.
27
MODEL 616
THEORY OF OPERATION
TABLE 4-7.
k7.n ldentlticetl0"
Pi"
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Designaeian
Function
no'e
25715D,
a. Isolatia"
Circuitry.
Isolation
of electrometer
LO and diuital
Outout Lo is achieved throunh the use
of a" opt&ally
c&led
isolator
for each Big"81
transmitted
between the 616 and 6162.
The isolators
are NPN types and provide
greater
than 10lOn isolaThe anodes of all light
emitting
tion resistance.
diodes are connected to +5 valts.
The diode conducts
whenever the cathode is connected law (a 3300 current
limit
resistor
is used with each input).
The output
of each isolator
transistor
is connected in e grounded emitter
or emitter-follower
configuration.
The Model 6162 utilizes
three
b. Decade C~u"ters.
decade cwnter
stages QA201, QA202, and QA203 for
"l",
"lo",
and "100" respectively.
Each integrated
circuit
provides
BCD information
using four linea
identified
as 1 x lo", 2 x lo", 4 x lo", and 8 x 10".
Individual
C. Storage Registers.
are used to control
data flow to the
Integrated
circuits
QA205,
stages.
are enabled by the output of QA223A
Voltage
Segment drive
Segment drive
Multiplex
Line
Multiplex
Lice
Display
hold
Range Enable
Threshold
input
Clock Pulse
Segment drive
Segment drive
Segment drive
Segment drive
Segment drive
Current Switch
No connection
No connection
Multiplex
line
-____
Power
Power
CO"lSOtl
Count Now
Multiplex
line
Range Line
Range Line
Rmge Line
___
F
G
Tl
T3
HOLD
MR
TH
CLK
B
A
D
E
C
cs
DP
$44
TO
Fl
F4
4-9.
DIGITAL OUTPUT (Refer to schematic
25716D, 25717C, and 25823C).
*or LSI
storage
registers
~"tput buffer
QAZOk, and QA207
(ENB).
d. Buffered
Output Stage.
Each buffer
ia composed
qf a Keithley
Part No. IC-22 NAND gate (four gates
The buffers
utilize
"open colper circuit
module).
lector"
output transistors.
Each circuit
module is
connected to a" individual
STROBE control
for mon-
Levels
+5"
+5V
+5V
t5V
+5v
0"
+5v
= ON, 0" - OFF
- ON
= ON
= ON
= "OLD
= inhibit
autoranging
or -12V
A~prox.~
,10kHz_,~~+SVto -lV
+5V = ON
+5v = ON
+5" - ON
t5V = ON
+5" = ON
+5V = integrate
mode
_--__
+5v - ON
0"
+5v
+5v
-12v
OV
+5v - 2016 counts
+5v = ON
See Table
4-6.
0"
itoring
two or more 6162 autputs
connected to a single
outpur bus.
Each set of four buffers
is enabled
whenever the Strobe line is pulled
davn to digital
10W. Each STROBE circuit
consists
of a" inverter
stage (Keithley
X-32),
a 4.7 kilahm pull-up
resistor,
and a protectian
diode (Keithley
RF-39).
e. Print Rate Control.
Print rate for the Model
6162 consists
of a timing circuit
composed of integrated circuit
QAloS, resisrar
X116, pOte"tiometer
R115 and capacitor
ClOl.
Patentiometer
R115 permits
continuous
control
of Print Rate from l/5 second per
reading
to 7 seconds per reading.
The Print Rate
cantrol
has no effect
on the Model 616 display
rate.
f.
Flag Circuitry.
The Flag autput is generated
by integrated
circuit
QAloS.
The oucput of buffer
stage QA222C is high far a length of time established
by the Print Rate Control.
No change in the digital
output is made during the interval
when Flag is high.
(Flag is Iv,,).
g.
BCD Hald Circuit.
This circuirry
inhibits
the
Enable oulae which in turn holds the infwmatio"
in
the s&-age
registers.
The Hold is activated
whenever DlOl is closed t" wtput
low.
Integrated
circuit
QA109 is a flip-flop
which is set by m.
h. Display
Hold.
This circuitry
controls
the
display
driver
in the Model 616. The Display
Hold
1s activated
whenever D102 is clased to output law.
1175
MODEL 616
SECTION
5.
5-1.
GENERAL. me following
‘(eithley
acces.sories
can be used with the Model 616 co provide
additional
convenience
and versatility.
ACCESSORIES
5-2.
OPERATING INSTRUCTIONS. A separate
Instruction
Manual is supplied
with each accessory
giving
complete
operating
information.
Model 6101.4 Shielded
Probe
Description:
The Model 6101A is a shielded
cable with B needle-point
probe and 30 inches of low noise cable terminated
by a
UHF COn”eCtor.
Shielded
Probe
Model 6103C Divider
Frobe
Model
61018
Description:
The Model 61018 is a shielded
cable wieh a “gripping
type” probe and 30 inches of low noise cable terminated
b,y a WF Co”“ectOr.
Description:
The Model 6103C is a shielded
cable with a needle-point
probe and 30 inches of low noise cable terminated
by a
UHF connector.
The orobe includes
a 1OOO:l voltwe
divider
with a 4.5 X’ 101ln resistance.
Accuracy Is
25% at 30 kilovolts.
Model
6102A
Divider
Probe
Description:
The Modei~ 610% is a shielded
cable with a needle-point
probe and 30 inches of low noise cabic terminated
by a
UHF connectorlO
The probe incl~odes a 1O:l voltage
divider with 10 il input resistance.
Accuracy is z&X at
1000 volts.
0577
29
ACCESSORIES
MODEL 616
Model 6011 Input
Description:
The 6011 is a low-noise
triaxial
cable,
30” long, terminated
by three color-coded
alligator
This cable mates directly
with the triaxial
clips.
The cable is fabricated
using a Keithley
part
input.
no. ~3-141 connector
and part no. SC-22 low-noise
cable.
Application:
The 6011 may be used far measurements
which require
a triaxie1
connection,
especially
when
the input I.0 is floated
above CASE ground.
Model 6301 Guarded
IleWZk-iptiCXl:
The 6301 is a guarded triaxial
3 ft. long, terminated
by a probe for making
point measurements.
Cable
Probe
Application:
The 6301 may be used for measurements
which require
a triaxial
cable with a guarded pfZbzhms,~
having an insulation
resistance
greater
than 10
cable,
point-to-
e
SC-22
Model
1531 Gripping
Description:
The 1531 is a triaxial
cable,
3 ft. long,
The 1531
terminated
by a special
gripping-type
probe.
insulation
resistance
is greater
than lOlo ohms.
The
probe is rated far off ground measurements up to 500 ”
cs-141
Probe
The 1531 may be used for meas”rements
Application:
which require
a triaxial
cable.
The probe permits
convenient
connections
to the circuit
under test due
to the gripping
feature.
Hi
Lo Lead
Model 6012 Triax-to-Coax
Adapter
Description:
The 6012 is an adapter for mating the
triaxiel
input end UHF (coax) type connectors.
This
adapter can be used with Models 6101A, 61018, 6103R,
6102A, etc.
CS-64
30
es-141
1175
MODEL 616
ACCESSORIES
Mod>1 6106 Elect, :ometer
Connection
Parts
Description:
The Model blob contains
a group of the most useful
leads and adapters
for low current
measurements.
All
components are housed in a rugged carrying
case with
individual
compartments.
Kit
List:
Item
NO.
Description
1
2
3
4
5
6
7
Cable, Xl”, UNF to clips
Cable, 24”, UHF to UHF
connector,
UHF to UHF
Adaptor,
UWF to BNC
Adaptor,
UHF to BNC
Adaptor Tee, UHF to “HE
Adaptor,
Binding Post
Keithley
Pam NO.
19072C
18265C
c-5
m-115
CS-172
lx-171
190718
The two cables (Items 1 and 2) are coaxial
shielded
leads useful for connections
where low noise is essential.
The 24” cable (Item 2) can be used to interconnect two instruments
having UHF receptacles.
The 30”
cable (Item 1) can be used to connect to the circuit
under test through the use of clip leads.
A bind~ing
post adapter gives easy access to the electrometer
“high”
terminal.
Two UHF femal couplers
(Item 3)
permit cables to be connected together.
The “HP “tee”
connector
simplifies
galvanometric
cUrrent measurements
when using a current
source and electrometer
or picaAdapters
(Items 4 and 5) are useful for conammeter.
version
from UHF to BNC terminations.
Models
2501,
2503 Static
Defector
Probes
Description:
2501 and 2503 are specially
designed deused to measure static
charge on plane surfaces.
Drobe must be used with an electrometer
The Models
tector~
Either
Model 2501:
The 2501 is useful
for
The static
surfaces.
Recomended spacing is
lO,OOO:l divider
ratio.
that a 1 volt deflection
spends to 10 kilovolts
measurements of charge on flat
head is 3 inches in diameter.
318” from the surface
for
The 2501 is calibrated
such
on the electrometer
con-eof static
charge.
Model 2503 :
The 2503 consists
Operation
ameter.
of a rigid
is similar
probe l/2 inches in dito the use of the 2501
probe.
Model 6107 p” Elecrrode
Description:
The Model 6107 is a test fixture
which simplifies
cmnections
to the electrometer
when making p” measureman”ment.3. The adapter can be used with electrodes
factured
by Leeds &Northrup,
Coleman and Beckman.
The 6107 can be used far guarded measurements
a~ shown
A voltage-to-p”
conversion
chart is
in the diagram.
supplied
with the 6107.
Adapter
,- ------------1
I
A?
Pip
Jd
LJ2
,
MODEL 616
ACCESSORIES
Model 6104 Test
Shield
Description:
The Model 6104 is a shielded
or three-terminal
connections.
teflon
insulated.
test
box for two-terminal
The ‘INPUT terminal
is
Applications:
1. TWO Terminal Connections.
Resistance
measurements can be made conveniently
using the INPUT and
GROUNDterminals
on the Test Sax.
Connect the electrometer
to the SNC output.
Use the electrometer
in
NORMAL mode
for ohms measurement.
2. Three Terminal
Connections.
The GUARD output
can be used for reon the Mode: 616 electrometer
sistance
measurements where the effects
of cable capacConnect the unknown between
itance may be significant.
Connect the EXT terminal
to
INPUT and EXT terminals.
Use the electhe GUARD output an the electrometer.
erometer
In FAST mode for ohms measurement.
Model 6105 Resistivity
Chamber
Description:
The Model 6105 is a guarded test fixture
for measurement of surface and volume resistivities.
The chamber
Fs designed in accordance with ASTM Standard Method of
Test for Electrical
Resistance
of Insulating
Materials,
The 6105 can be used in conjunction
with an
D257-66.
electrometer
and voltage
supply.
Applications:
Resistivity
can be determined
by measuring
the current
through a sample with a known voltage
impresaed.
The
measurement can be made most conveniently
when B set
of electrodes
are used which can be calibrated
in terms
Of surface or volume resistivity.
The Keiehley
Model
6105 Resistivity
Adapter has been designed for use with
a Keithley
electrometer
and an optional
high voltage
supply such as the Model 240A.
32
1175
MODEL 616
MAINTENANCE
SECTION
6.
MAINTENANCE
GENERAL. This section
contains
information
nec6-1.
essary to maintain
the instrument
to published
specifiCSltiO"S.
5. Turn the instrument
power on and allow the
instrument
to stabilize
at ambient temperature
for
at least l/2 hour.
Record the temperature
so that
temperature
coefficients
can be utilized
as necessary.
REQUrKED TEST EQUIPMENT. Minimum requiremenes
6-2.
for test equipment are given in Tables 6-l and 6-6.
b.
PERFORMANCE"ERIFICATION.
6-3.
"se rhe following
procedure
to verify
proper operation
of the instruof the instrument
is based on an
ment . Performance
operating
telnperature
between 20°C and 3o"c and relative
humidity
less than 70%.
a.
Preliminary
Voltage
1. set the Line Switch to 117 or 7.34" depending
on the line power available.
1.
Select
NORMALmode and VOLT function.
2.
Select
the AUTO SENSITIVITY
4.
117":
234V:
Verify
3116 ampere,
l/l0
ampere,
that
the appropriate
Check.
mode.
3. Place ZERO CHECK switch on. The display
should indicate
.OOOOOvolts.
If necessary,
adjust
the front panel ZERO control
to obtain a rero reading with the polaricy
indicator
blinking
on and off.
set-"E.
2. Fuse Check:
fuse is installed.
Accuracy
Place
ZERO CHECK switch
off.
line
5. Apply dc voltages
to the in,xe of rhe Model
616 as given in Table 6-2 using Voltage Source (A).
3AC, SLO-SLO (Keithley
3AG, SLO-BLO (Keithley
F"-29)
R-40)
TABLE 6-2.
Accuracy
Voltage
3. connect the power cord to a variable
transformer which has been set to 117" t 1" or 234V I
2" depending on the line power available.
source
Accuracy
link
(on the rear panel)
4. Connect the shorting
between LO and GROUND. FIX maximum operator
safety,
make certain
that the chassis
is connected to earrh
ground by way of rhe third
conductor
on the line
cord or by way of a separate
clip lead from GROUNU
to earth ground.
10 m"
100 Ill"
1"
10 "
100 V
Check
Display
Reading
.01000
.lOOO
1.000
10.00
100.0
0.03%
0.03%
0.03%
0.03%
0.03%
"
v
v
v
"
Reading
Tolerance
t3
?3
23
3
i3
digits
diaits
d&t*
digit..
digits
E
TABLE 6-1.
Item
A
B
Description
Mfr.
Specification
Voltage
Source (DC), lOm"
iO.O3% accuracy
to 100" in decade steps
) ,I)
(For 1OmV range use 1O:l divider)
Resistance
source, 1050 to
?0.05%, 105n f0 1070
f0.2%, 1oSn
1O120 in decade steps
?0.5%, 1oQ to 101*0
c
Current
10-4A
Source,
lo-lA
to
D
current
source,
lo-'A
Ranges
lo-?+
~to
E
current
lo-=A
10-g to
source,
iO.O5%,
tO:b;$
lo-IA
l&5A
to lo-4A
4
to 10-7A
LtZ%, 10-8A
0.6%, 10-gA to 10-llA
and Model
Fluke, Mode1 341A
GK 1455BH (divider
GK 1433,
Fluke,
Keithley
for
10,~")
Model 5155
Model 3330B
Fluke, Model 341A, and GR1433
see Note 1.
Keithley
Model 261.
3 11,C.d :,; : i
NOTE 1.
To Verify
used with
1175
the accuracy on the 10-5A to $0-7 ranges,
u'
precision
resistors
having t0102$accuracy.
a Model 341A should
be
33
MODEL 616
MAINTENANCE
6. Check the lo-1A
with Table 6-4.
Resistance
Accuracy
1.
Select
NORMALmode.
2.
Select
the 1 VOLT SENSITIVITY
3.
Select
the LO5 ohm range.
4.
Apply
C.
Check.
lo5 ohms using
m'io-llA
mode.
Verify
that
i6 digits.
Resistance
the reading
Check the remaining
6-3.
6.
Table
Source
an the display
ranges
source
Accuracy
105 n
106 n
107 0
108 n
109 n
lolon
10%
1012fl
Current
d.
105 n
1.000
x 105 n
Accuraw
1.000
1.000
1.000
1.000
1.000
1.000
x
x
x
x
x
x
Select
NORMALmade.
2.
Select
1 VOLT SENSITIVITY.
3.
Select
10-l
4.
Apply
10-l
Reading
Tolerance
f6 digits
10-l
lo-'
1O-3
1O-4
1O-5
10-6
1017
i6 digits
t21 digits
f51 digits
?51 digits
f51 digits
i51 digits
ranges
in accord
current
TABLE 6-4.
Accuracy
source
Accuracy
i-0.05%
iO.O5%
r0.05%
k0.05%
*o.o5z
io. 05%
?0.05%
kO.Z%
+o.6%
i-0.6%
+0.6%
A
A
A
A
A
A
A
lo-lo,
lo-11A
Coulmbs
e.
using
Cur-
with
Table
6-4.
Check.
Display
Reading
Range
10-l
A
1.000
x 10-l
Reading
Tolerance
A
f6 digits
IO-~ A 1.000 x 1O-2 A i6 digits
lo-3 A
10-4 A
10-5 A
10-6 A
10-7 A
10-8 A
LO-'
10-10;:
lo-"A
Accuracy
1.000
1.000
1.000
1.000
1.000
1.000
x
x
x
x
x
x
lO-3
10-4
1O-5
10-6
lo-'
-g
10-8
A *6 digits
A f6 digits
A t6 digits
A ?6 digits
A +6 digit6
A iZ1 digits
A i51 digits
::::;
:: :h",
k51 digits
1.000 x 10-llA
i51 digits
Check.
1.
Select
FAST mode.
2.
Select
1 VOLT SENSITIVITY.
3. Apply an input current
in decade steps from
10-8 ampere to lo-11 ampere in accordance with
(Display
should read zem with "ZERO
Table 6-5.
If not, close "ZERO CHECK"
CHECK" switch apen.
switch for short period of time.)
the reading
Current
Source
O" the display
(C).
that
4. Verify
1.000 volt display
is
TABLE 6-5
Coulombs Accuracy
source
**put
lo-8A
$aA
lo-llA
34
ranges
with
ampere range.
ampere "sing
Verify
that
t6 digits.
10' il
108 n
109 n
101on
1011n
101G
of 10-5A
Check.
1.
5.
within
Verify
1.06 s2 1.000 x 106 R i6 digits
107 n
108 n
109 n
101On
1011n
101211
verification
is
Check
Display
Reading
Range
iO.O5%
FO.O5%
i0.05%
?0.2%
f0.5%
?0.5%
f0.5%
10.5%
in accord
in accord
(B).
source
Input
TABLE 6-3.
Resistance
Accuracy
source
Input
Select FAST mode for
ranges.
ranges
8. Check the 10-5A to lo-llA
rent Source CD) and (0.
9.
5.
within
to lo-4A
source
Accuracy
kO.5%
f0.5%
?0.5%
50.5%
Range
lo-'q
lo-SQ
10-9
10-l 8 Q
Display
Reading
the integration
is 10 seconds
time to reach
*l/2 second.
a
Check.
Time to
Reading
10
10
10
10
sets.
t?ecs.
sets.
sets.
1
Tolerance
t1/2
ill2
f1/2
*1/z
sec.
sec.
sec.
sec.
1175
MODEL 616
MAINTENANCE
6-4.
ADJUSTMENT AND CALIBRATION.
This procedure
should be used whenever it is necessary
to calibrate
the instrument
to ensure that it meets published
specifications.
Calibration
may be accomplished
every
12 months to ensure accuracy over long-term
use or
more frequently
if desired.
d. Power Supply Check.
This procedure
chat the power supply voltages
are within
colere"ces.
No adjustments
are required.
1.
given
a. Test Equipment.
The test equipment recommended
in Table 6-6 should be used to ensure proper ~results.
Other equipment may be substituted
if specifications
meet or exceed those given.
b. Enviranment
ed in a controlled
tion is performed
and less than 50%
temperature
range
C.
2.
Preliminary
Measure rhe supply
in Table 6-7 using
voltage
at the test
Voltmeter
(F).
Verify
for
the reading
e. Voltage Calibration.
a11 Measurements.)
1. Front Panel zero
The calibration
should be performenvironment.
The factory
calibraat approximately
25'C temperacure
relative
humidity.
Recommended
for caLibratlon
is 23'C to 2°C.
4.
Place
b).
Select
c).
meter
set-up.
l&V
Monitor
(F).
d).
Reading
OlOmV dc.
2. Fuse Check:
fuse is installed.
e).
3/16 ampere,
l/l0
ampere,
117.":
234V:
that
the appropriate
3AG, SLWBLO (Keirhley
3AG, SLO-BLO (Keithley
line
4. Connect the shorting
link
(on the rear panel)
between LO and GROUND. For maximum operating
safety, make certain
that the chassis is connected to
earth ground by way of the third
conductor
on the
line cord or by way of a separate
clip lead from
GROUNDto earrh ground.
Itern
Description
F
Voltmeter,
3-112
ill" resolution
G
Oscilloscope
power supply
H
Voltage
I
Voltage Source (DC), 1OmV
to 100" in decade steps
(For 1Om" range use 10:ldivider)
Resistance
source, 105ii
.J
1175
(Used for
check)
Source
(DC) +5mv
NORMALmode for
Adjust
SENSITIVITY.
the Xl output
on Voltmeter
franc
panel
(5118)
"olt-
be .OOO
ZERO (R119) as necessary.
ZERO CHECK to on.
b).
Select
1OmV SENSITI"lTY.
d).
*l.Om"
Monitor
(F).
Reading
dc.
e).
Adjust
as necessary.
TABLE 6-6.
Eauioment for
rhe 1" output
on Voltmeter
potentiometer
lmV/divisio"
(5117)
Mfr.
Keithley
ac coupled
(F) should
"alt-
be 00.0
R311 (A-D INPUT ZERO)
Tektronix,
and Model
Model
160
Model 561A
?l% accuracy
Keithley
iO.O3% accuracy
Fluke, Model 34111
GR 1455BH (divider
for
accuracy
using
Calibration.
?0.2% accuracy
f0.02%
using
(F) should
Place
Specification
digits,
(Select.
a).
c).
meter
5. Turn the i"strume"t
power on and allow the
instrument
fo stabilize
at ambient temperature for
at least l/2 hour.
Record the temperature
so that
temperature
coefficients
can be utilized
as necessary.
Test
each voltage.
NOTE
If the front panel ZERO control
does not provide enough adjustment
capability,
the internal potentiometer
R123 should be adjusted.
(Located on small pc board inside
shielded
input campartment.)
2. A-D Input Zero.
FU-29)
FU-40)
3. Connect the power cord to a variable
tra"sformer which has bee" set to 117V Z 1" or 234V f
2" depending on the line power available.
Reauired
points
ZERO CHECK to on.
1. Set the Line Swifch to 117 or 234V depending
on the line power available.
Verify
verifies
nominal
General
Model 260
Radio,
Model
1OmV)
1433
35
MODEL 616
MAINTEPlANCE
mwer
Test
Voltage
+5v
+1ov
-12V
-9v
+12v
+275v
-275V
3.
Display
Point
TABLE 6-7.
Supply Check
Pk-to-Pk
Ripple
Tolerance
anv
‘1V
<2mV
<4nlv
<4mv
GV
<3v
?25Om"
f7.5V to +11v
i-6OomV
*45Omv
i6OomV
+205 to +3oov
-205 to -300V
TP4
+1ov unreg.
TP5
TP2
TP3
+275v unreg.
-275V "nreg.
a).
Place
ZERO CHECK to off.
b).
Select
1V SENSITIVITY.
c).
source
Apply
(II).
d).
digits.
Reading
+5 millivolts
dc ?l% using
on Model 616 should
7.
?O
potentiometer
a).
Select
b).
source
Apply
(H) .
C).
digits.
Reading
4.
Select
-5 millivolts
dc ?l% using
on Model 616 should
potentiometer
Voltage
Select
be -0.005
f0
R305 (RECT. ZERO) as
R307 (-DC CAL) as
1Omv SENSITIVITY.
Apply +1O,,,V dc iO.O3% using
(with 1O:l divider).
8.
R305 is rebath readadjustment.
Reading
Reading
Voltage
Source
a).
Select
+lV dc iO.O3% using
Voltage
on Model 616 should
Source
he +l.OOO +O
be +.OlOOO il
b).
Apply
(I).
1OOV SENSITIVITY.
+lOO.OV dc ?0.03% using
c) * Reading
1V SENSITIVITY.
potentiometer
on Model 616 should
1oov RANGE A&J.
source
be +lOO.OV
digit.
Adjust
d).
as necessary.
f.
on Model 616 should
Voltage
Resistance
potentiometer
R304 (1OOV RANGE ADJ3.
Calibration.
1.
Select
1v SENSITIVITY.
2.
Select
105Q range.
3.
Apply
R309 (+DC CAL) as nec-
NOTE
The +DC CAL must be performed
(in the order
given) before the -DC CAL to obtain proper
calibration.
4. Reading
105n f0 digif.
a resistance
of 100 kilobms
on the Model 616 should
iO.O2%.
be 1.000 x
-DC CAL.
a).
36
*O
NOTE
The front panel ZERO control
may have to be
adjusted
in ZERO CHECK prior
to this adjustmem CO eliminate
an error due to zero offset.
rl
d).
Adjust
WFkWY.
be -1.000
d).
Adjust potentiometer
R303 (1OmV RANGE 03.)
as necessary.
(This control
has an adjustment
range of approx.
-o!Jv to +loouv.)
CAL.
Apply
6.
b).
C).
digit.
1v SENSITIVITY.
2.
C).
digit.
potentiometer
Source
R308 (DISPLAY ZERO)
NOTE
If an adjustment
of potentiometer
quired,
repeat steps 3 and 4 until
ings are obtained
without
further
+lx
Voltage
Zero.
Adjust
d).
lleCet?tXWy.
5.
using
1OMV RANGE ADJ.
(I)
Rectifier
dc f0.03%
an Model 616 should
Adjust
d).
necessary.
Voltage
be +0.005
-lV
Reading
C).
digit.
a).
4.
+1Omv
Unregulated
flOUlV
fl5OmV
?lhV
Unregulated
Unregulated
Apply
zero.
Adjust
=).
as necessary.
Line Regulation
9ov - 125v AC __
Select
1v SENSITIVITY.
5. Adjust
ee.s*ry.
potentiometer
R114 (OHMS CAL) as nec-
MODEL 616
REPLACEABLE PARTS
SECTION
REPLACEABLE
7.
7-1.
REPLACEABLE PARTS LIST:
This section
contains
a list
of components used in this instrument
far
user reference.
The Replaceable
Parts List describes
the individual
parts giving
Circuit
Designation,
Description,
Suggested Manufacturer
(Code Number),
PARTS
Manufacturer’s
Part Number, and the Keithley
Part
Number.
Also included
is a Figure Reference Number
where applicable.
The complete name and address of
each Manufacturer
is listed
in the CODE-TO-NAME
Listing,
Federal Supply Code, Handbook H 4-2.
TABLE 7-1.
Abbreviations
and Symbols
A
CbVar
CerD
cer Trimmer
CLXlp
Carbon Variable
ceramic Disc
Ceramic Trimmer
Composition
DCb
oesig.
F
Fig
GCb
Class
k
kilo
(10 3,
Deposited
Carbon
Designation
Ir
micro
(10-b)
~~~
Electrolytic,
Electrolytic,
Electrolytic,
M
Mfr.
MtF
MY
NO.
Number
enclosed
Carbon
a
ohm
Fc
Poly
pica (10-12)
Printed
circuit
Polystyrene
Ref.
EAL
ETB
ETT
Aluminum
tubular
tantalum
Manufacturer
Metal Fill”
Mylar
7-2.
ELECTRICAL SCHEMATICS AND DIAGRAMS. Schematics
and diagrams are included
to describe
the electrical
circuits
as discussed
in Section 4.
HOWTO USE THE REPLACEABLE PARTS LIST.
This
Part6 List is arranged
such that the individual
types
of components are listed
in alphabetical
order. Main
Chassis parts are listed
followed
by printed
circ”it
boards and other subassemblies.
7-3.
a.
1.
2.
3.
4.
5.
parts
may be ordered
through
the
TABLE
Schematic
Autoranging
Isolated
Isolated
Isolated
Isolated
1175
”
volt
w
ww
WW”ZlC
wate
Wirewound
Wirewound
ordering
Variable
Keithley
Instruments,
representative.
parts,
include
Inc.
the fallowing
Instrument
Model Number.
Instr.lment
Serial
Number.
Part Descrip?io”.
Schematic Circ”it
Designation.
Keithley
Part Number.
7-2.
Diagrams
Schematic
Description
Electrometer
Power supply
LSI Circuit,
Cappeweld
C. All parts listed
are maintained
in Keiehley
spare parts Stock.
Any part not listed
can be made
available
upon request.
Parts identified
by the
Keirhley
Manufacturing
Code Number SO164 should be
ordered directly
from Keithley
Instruments,
Inc.
HOWTO ORDER PARTS.
Replaceable
Tinner
Sales Service Department,
or your nearest Keithley
b. “hen
information.
7-4.
TCu
(106)
Amp 6 Range Switching
Digital
Logic 6 Display
Amplifier,
Integrator,
Threshold
Output/Control
Output/Control
Output/Control
Output/Control,
Power Supply
No.
257648
257770
Det.
25778E
2577bD
25715D
2571bD
25717C
25823C
37
REPLACEABLE
MODEL 616
PARTS
circuit
series
100
200
300
300
400
TABLE 7-3.
Designation
DescriDtion
circuit
NO.
__
__
1
2
3
4
5
6
7
8
9
10
11
-12
13
_14
15
-lb
17
18
19
20
38
Deecripticm
Chassis Assembly
Front Panel Assembly
Front Panel
b-32
Screw, Slotted,
Front Panel Overlay
Rear Panel
Side Extrusion
Left
Side Extrusion
Right
corner Bracket
Screw, Phillips,
b-32 x
Screw, Phillips,
b-32 x
Clip for Side Dress
Side Dress Panel
Top Cover Assembly
Top Cover
Screw, Phillips,
b-32 x
Bottom Cover Assembly
Bottom Cover
Screw, Phillips,
b-32 x
Feet Assembly
Fee*
Ball
Tilt
Bail
Screw, Phillips,
b-32
Kep Nut, b-32
Qty.
x 318
l/2
l/2
Desig"ati.o"
Paue No.
40
PC-321,361
PC-321
PC-324
PC-324
PC-322,323
Electrometer
Amplifier
Power supply
Auto-Ranging
Amplifier
Integrator,
Threshold
Det.
Digital
Logic & Display
TABLE 7-4.
Mechanical
Parts
Itern
series
2:
44
45
List
Per Assembly
1
4
1
1
1
1
*
4
4
2
2
5/16
1
4
5/16
1
4
4
4
1
4
4
Keithley
Part
No.
Fiuure
-_25770B
-25598B
2570bB
25773B
25772B
24745B
--FA-101
243bOB
-_
25771C
__
32
25564B
33
No.
2556X
--24322B
FE-6
171478
__
_-
0476
REPLACEABLEPARTS
MODEL 616
FIGURE 32.
Chassis Assembly
FIGURE 33.
1175
- Exploded
View.
Bottom Cover Assembl’y.
39
MODEL 616
REPLACEABLE PARTS
COMPONENT DESIGNATION LISTING
Parts
Shown on Schemaeic
No. 257643
Keithley
Part No.
Cl01
Cl02
Cl03
Cl04
Cl05
Cl06
Cl07
Cl08
Cl09
Cl10
Cl11
Cl12
Cl13
Cl14
Cl15
DlOl
D102
D103
0104
JlOl
5102
5103
5104
J105
5106
5107
5108
J109
JllO
Jill
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
KlOl
PlOl
PlO2
P103
P104
P105
PlOb
P107
P108
P109
PllO
Plll
P112
P113
P114
P115
Pllb
40
capacitor,
5 pF, 2oov. Poly
Capacitor,
10 pF, 5OOV, Poly
Capacitor,
22 pF, 5OOV, Poly
Capacitor,
47 pF, 5OOV, Poly
Capacitor,
100 pF, 63OV. Poly
Capacitor,
100 pF, 63OV, Poly
Capacitor,
100 pF, 63OV, Poly
Capacitor,
0.1 ,,F, ZOOV, Poly
Capacitor,
0.01 "F, 63OV, Poly
Caoacitor,
0.001 uF, 63OV. Polv
C&citor;
100 pF, 63OV, Poly
Capacitor,
270 ,,F, bV, ETT
See page 46
Capacitor,
0.02 j,F, lOOOV, CerD
capacitor,
10 PF, lOOOV, CerD
Diode
Diode
Diode
Diode
Connector,
Card-Edge,
15-pin (Mates with
Connector,
Card-Edge,
15-pi"
(Mates with
Connector,
Card-Edge,
22-pin (Mates with
Connector,
Card-Edge,
b-pin
(Mates with
(Shown an Schematic no. 257788)
(Shown on Schematic no. 25778E)
(Shown on Schematic no. 257783)
(Shown on Schematic no. 257783)
Connector,
5-pin
(Shown on Schematic no. 257788)
Connecmr,
3-pin
Ca""ector,
lo-pin
Used on Model 6162
Used on Model 6162
Used on Model 6162
Co""ector,
lo-pi"
(Shown on Schematic no. 2577bD)
Binding Post, White (Xl)
Binding Post, Blue (GUARD)
Connector,
Triaxial
(INPUT)
Connector,
Binding Post, Black (LO)
Connector,
Binding Post,
Black (LO)
Connector,
Binding
Post, Green (GND)
Relay (Zero Check)
Connector,
Card-Edge (PC-323)
Connector,
Card-Edge (PC-323)
Connector,
Card-Edge (PC-324)
See paga 46
Connector,
Male (10 pins)
connector,
Male (10 pins)
Connector.
Male (10 pins)
Connector,
Male (10 pins)
Connector,
Male (5 pins)
Connector,
Male (5 pins)
Connector,
Male (3 pins)
Connector,
Male (10 pins)
Connector,
Male (5 pins)
(Shown on schematic no. 257783)
Co""ector,
Male (10 pins)
Connector,
Male (10 pins)
c31-5P
C138-1OP
C138-22P
C138-47P
C252-1OOP
C252-1OOP
C252-1OOP
C251-.lM
C252-.OlM
C252-.OOlM
C252-1OOP
C194-270M
...
PC-323)
PC-323)
PC-324)
PC-325)
C22-.02M
Cb4-1OP
RF-28
RF-28
RF-28
RF-14
cs-259
cs-259
CS-241
65-267
...
...
...
...
CS-251
CS-270
CS-237
Locarion
Range Switch
Range Switch
Range Switch
Range Switch
Range Switch
Range Switch
Range Switch
Range Switch
Range Switch
Range Switch
Range Switch
PC-321
PC-361
PC-321
Range Switch
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
.*.
...
...
...
PC-321
...
...
Front
Front
*.*
.
Panel
Panel
CS-237
Front
BP-11
BP-11
CS-181
BP-11BLK
BP-11BLK
BP-11GRN
Rear Panel
Rear Panel
Front
Panel
Rear Panel
Rear Panel
Rear Panel
SOL-7,RL-45
Chassis
...
...
...
PC-323
PC-323
PC-324
PC-361
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
...
PC-321
PC-321
. ..
. *.
cs-340-10-x
cs-340-10-x
cs-340-10-x
cs-340-10-x
cs-340-5-x
cs-340-5-x
cs-340-3-x
CS-340-10-x
cs-340-5-x
...
cs-340-10-x
cs-340-10-x
Panel
0577
REPLACEABLE PARTS
MODEL 616
ClX"lt
Desk.
QlOl
Q102
4103
Q104
Q105
q106
Q107
QUO1
it101
RI02
R103
R104
RI05
R106
R107
R108
R109
RllO
Rlll
R112
R113
Rl14
R115
R116
RI17
Ill18
R119
RHO
R121
R122
RI23
R124
R125
R126
RI27
DesCripLfo"
see page
see page
see page
see page
Transistor,
Transistor,
see page
see page
SlOl
s102
s103
Switch,
Switch,
Switch,
1175
NPN
PNP
TG-103
TG-102
PC-321
PC-321
101b,
+3Ya, -.57 0. Megox
1o*g 5%. 1/2w
200n, I%, 1/8W, MtF
Potentiometer,
ZKQ, 0.6W
10Kn. 0.1%. ,.,~118W. MtF
lOfl, l%, 1/8W, MtF
9000, O.l%, 1/8W, MtF
lOOR, O.l%, 1/8W, MtF
Potentiometer,
1KR (ZERO)
R221-9.99
R221-100
R169-1K
R169-10K
R169-100K
R169-100K
R174-10M
R14-100
Y
;;,';I;,"10
R222-1011
R180-108
R88-200
RP94
R168-1OK
R88-10
R168-900
R168-100
RPlOO-1K
Range Switch
Range Switch
Range Switch
Range Switch
Range &itch
Range Switch
Range Switch
Range Switch
Range Switch
Range Switch
Range Switch
Range Switch
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
Front Panel
lOK0, l%, 1/8W, MtF
4.02KO, l%, 1/8W, MtF
4.02Kn, l%, 1/8W, MtF
39.2KR. 1%. 1/8W, MtF
20Kn, I%, 1/8W, MtF
20Kn, 1%. 1/8W, MtF
R88-10K
RBB-4.02K
R88-4.02K
R88-39.2K
R88-20K
R88-20K
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
SW-368
SW-309
SW-366
Front
Front
Front
44
44
1m, O.l%, 1/2w, MtF
lOK0, 0.1%. 1/2W, MtF
lOOKR, O.l%, 1/2w, MtF
lOOfa, O.l%, l/ZW, MtF
lOMfi, 0.1%. 1/2W
R130
Locatlan
44
44
44
44
,
Resistor,
Resistor,
Resistor,
Resistor,
Resistor,
Resistor,
RI28
R129
COMPONENTDESIGNATION LISTING
Parta Shown on Schematic Na. 25764
Ke k thley
Part No.
Rotary
Toggle
Toggle
(RANGE)
(ZERO CHECK)
(FAST/NORMAL)
SlOl
SlOl
SlOl
SlOl
SlOl
SlOl
SlOl
SlOl
SlOl
SlOl
SlOl
SlOl
Panel
Panel
Panel
41
MODEL 616
REPLACEABLE PARTS
Parts
Keithley
*art NO.
ClrCUlt
iksig.
DescriDtlan
a01
c202
C203
C204
C205
C206
C207
C208
c209
CZlO
c211
c212
C213
C214
C215
C216
C217
C218
c219
c220
c221
c222
C223
C224
Capacitor.
Capacitor,
Capacitor,
Capacitor,
capacitor,
Capacitor,
Capacitor,
Capacitor,
capacitor,
Capacitor,
Capacitor,
capaci.tor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
0201
II202
D203
D204
D205
D206
D207
D208
D209
D210
Diode
Diode
Diode
Diode
Diode,
Diode,
Diode
Diode
Diode
Diode
F201
Fuse (117V) 3/16A,
Fuse (234V) l/lOA,
P201
Connectqr,
Q201
Transistor,
QA201
QA203
Integrated
Integrated
Integrated
R201
R202
R203
R204
R205
R206
R207
R208
It209
R210
R211
R212
Resistor,
Resistor,
Resistor,
Resistor,
Resistor,
Reaietor,
Resistor,
Resistor,
Resigtor,
Resistor,
ReedstoT,
Resistor,
QA202
42
COMPONENTDESIGNATION LISTING
Shown on Schematic No. 25777D
4.7 uF, 35OV, EAL
10 j,F, 35OV, EAL
4.7 uF, 35OV, EAL
10 pF, 35OV, EAL
200 !JF, 35v, EAL
39 !JF, 15V, Epoxy
200 vF, 35V, EAL
100 PF,
39 pF, 15v, Epoxy
2OOO,,F, 15V, EAL
ZOOOuF, lSV, EAL
100 pF, lOOOV, CerD
400 uF, 35V, FAL
10 uF, 2OV, ETT
39 uF, 15V, Epoxy
39 uF, 15V, Epoxy
39 pF, 15V, Epoxy
39 liF, 15V, Epoxy
39 PF, 15V, Epoxy
0.01 uF, lOOOV, CerD
0.01 IIF, lOOOV, CerD
0.01 IIF, lOOOV, CerD
0.01 "F, lOOOV, CerD
4.7
uF, 2OV, ETT
Full-wave
Zener
bridge
3AG SLO-BLO
3AG SLO-BLO
Receptacle
PNP, Flat
Circuit,
Circuit,
Circuit,
(Line
Power)
Package
Voltage
Voltage
Voltage
Regulator
Regulator
Regulator
1.21Kn, l%, 1/2W, MtF
3.OlKn. l%, 1/8W, MtF
22n. 10%. 1/4w. cmnr,
4.9&a,
0.x%, ifsw 7.4Kn, O.l%, 1/8W
6.98K0, l%, l/SW, MtF
3.OlK0, l%, 1/8W, MtF
3.01Kn, l%, 1/8W, MtF
1.5K& 10X, 1/4W, Camp
3.01Kn. 1%. 1/8W, MtF
lMn, lo%, 1/4W, Camp
lMn, lo%, 1/4w, camp
C240-4.7M
C240-10M
C240-4.7M
C240-10M
C177-200M
C228-39M
C177-200M
C64-1OOP
C228-39M
C210-2000M
CZlO-ZOOOM
C64-1OOP
C212-400M
C179-10M
C228-39M
C228-39M
C228-39M
C228-39M
C228-39M
c22-.olM
c22-.olM
c22-.olM
c22-.olM
C179-4.7M
L0cati.m
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
RF-38
RF-38
RF-38
PC-321
PC-321
RF-38
PC-321
RF-36
m-7
RF-34
RF-34
RF-38
RF-38
PC-321
PC-321
PC-321
Fu-29
FU-40
Rear Panel
Rear Panel
CS-254
Rear
TG-100
PC-321
IC-25
IC-25
x-34
PC-321
R94-1.21K
R88-3.01K
R76-22
R176-4.99K
R176-7.4K
R88-6.98K
PC-321
R88-3.01K
R88-3.01K
R76-1.5K
R88-3.0lK
R76-lM
R76-lM
PC-321
PC-321
PC-321
PC-321
Panel
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
1175
REPLACEABLE PARTS
MODEL 616
COMPONENTDESIGNATION LISTING
Parts Shown on Schematic No. 257771)
Keithley
*art No.
CirC"*t
Deslg.
Description
s201
s202
Switch
Switch,
T201
Transformer
P108
P109
PI10
P112
P114
Connector,
Connector,
Connector,
Connector,
Connecfar,
Male
Male
Male
Male
Male
.I101
5102
5103
5104
Connector,
connector,
~anneccar,
Connector,
Card-Edge,
Card-Edge,
Card-Edge,
Card-Edge,
1175
(117 - 234V)
Toggle (Power ON)
(10 pins)
(4 pine)
(5 pins)
(10 pins)
(10 pina)
15-pin (Mates
15-pin (Mates
22-pin
(Mates
6-pin (Mates
with *C-323)
with X-323)
with PC-324)
with PC-325)
L0cati0ll
SW-151
SW-236
Rear Panel
Front Panel
TR-152
PC-321
24249A
24249A
24249A
24249A
24249A
PC-321
PC-321
PC-321
PC-321
PC-321
cs-259
cs-259
CS-241
CS-267
PC-321
PC-321
PC-321
PC-321
43
REPLACEABLE PARTS
MODEL 616
COMPONBWTDESIGNATION LISTING
Part8 Shown on Schematic No. 257761)
CirCUit
Desig.
Description
c301
C302
c303
c304
c305
C306
C207
C308
c309
c310
c311
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
D301
D302
D303
D304
Diode,
Diode,
Diode,
Diode,
DN301
Diode Network,
Q301
9302
q303
Q304
Q305
Q306
9307
330 pF, lOOOV, CerD
39 ilF, 15V, Epoxy
39 uF, 15V, Epoxy
.0033 liF, 5OOV. CerD
1 uF, lOOV, My
.0033 uF, 5OOV, CerD
39 uF, 15V, Epoxy
0.1 !,F, 25OV, MtF
0.33 uF, 5OV, CerT
0.01 uF, 5OV, MPC
0.01 ,,F, 5OV, MPC
Rectifier
Rectifier
Rectifier
Zener, 9V
Transistor,
Transistor,
Transistor,
Transistor,
Transistor,
Transistor,
Transistor,
B-pin
DIP
Dual N-Channel J-FET, Case TO-71
N-Channel,
J-FET, Case TO-18
N-Channel,
J-FBT, Case TO-18
N-Channel,
J-FET, Case TO-18
N-Channel,
J-FET, Case TO-18
PNP, Case TO-92
PNP, Case TO-106
QA301
QA302
QA303
qA304
QA305
qA306
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
R301
8302
R303
R304
R305
R306
R307
R308
R309
R310
R311
R312
R313
Resistor,
Resistor,
Resistor,
Resistor,
Reeistor,
Resistor,
Resistor,
Resistor,
Resistor,
Resistor,
Resietor,
Resistor,
Resistor,
RN301
RN302
RN303
RN304
* Revised,
P103
P112
Resistor
Resistor
Resistor
Reeietor
RN-301-B
Connector,
Connector,
Network, Thick-Film
(Revised)
Network, Thick-Film
Network, Thick-Film,
16-pin DIP
Network, Thick-Film,
14-pin DIP
Changed to 49.6Mn
Card-Edge (PC-324)
Male (lo-pins)
5103
5117
Connector,
Connector,
Card-Edge,
22-Pin (Mates with
Binding Poet, Red (1")
44
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Amplifier,
Amplifier,
Amplifier,
Amplifier,
Amplifier,
Transistor
E-pin
E-pin
8-pin
8-pin
8-pin
Array
DIP
DIP
DIP
DIP
DIP
61.9K0, O.l%, 1/8w, MtF
61.9Kn, 0.1X, l/SW, MtF
Potentiometer,
lM0, .75w
Potentiometer,
500R. .75W
Potentiometer,
5OOn, .75W
lKn, 1%. 1/8W, MtF
Potentiameter,
lKn, .75W
Potentiometer,
lOKs1, .75W
Potentiometer,
lKn, .75W
ZKR, 1%, l/SW, MtF
Potentiometer,
2KG
lOw1, lo%, 1/4W, Camp
80.6Kn. l%, l/EW, MtF
PC-324)
Keithley
Part No.
Location
C64-33OP
C228-39M
C228-39M
C22-.0033M
C245-lM
C22-.0033M
C228-39M
C178-.lx
C237-.33M
CZOl-.OlM
C201-.OlM
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC.324
RF-28
RF-28
RF-28
DZ-41
PC-324
PC-324
PC-324
PC-324
DN-2
PC-324
TG-98
TG-61
TG-110
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
IC-74
IC-76
IC-76
IC-77
IC-24
x-53
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
R168-61.9K
R168-1Mn
RP89-500K
RP89-500
RP89-500
R88-1K
RP89-1K
RP89-10K
RP89-1K
R88-2K
RP89-2K
R76-10K
R88-80.6~
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
PC-324
TF-15*
TF-5
TF-2
TF-3
PC-324
PC-324
PC-324
PC-324
24249A
PC-324
PC-321
cs-241
BP-1lR
Rear
TG-97
TG-97
TG-97
TG-97
PC-321
Panel
0577
MODEL 616
REPLACEABLE PARTS
COMPONENIDESIGNATION LISTING
Parts Shown on Schematic No. 25778s
c401
C402
C403
c404
D401
0402
D403
0404
D405
D406
ON401
DN402
DN403
DN404
DN405
DN406
capacitor,
O.OlUF, 500". Cer.D
Capacitor,
O.Ol,,F, 5OV, MPCb
capacitor,
4.7!lF, zov, ETT
capacitor,
4700 PF, 500 V,CerD
Diode, Rectifier
Diode, Rectifier
Diode, Rectifier
Diode, Rectifier
Diode, Rectifier
Diode, Rectifier
Digital
Display
(OVERRANGE)
Digital
Display
(seven-segment)
Digital
Display
(Seven-segment)
Digital
Display
(Seven-eegment)
Digital
Display
(Seven-segpnent)
Digital
Display
(Seven-segment)
.I101
5102
5103
J105
5106
5107
not3
.I110
5115
Card-Edge,
15-pin (Mates with
Card-Edge,
15-pin
Card-Edge,
22-pin
lo-pi"
lo-pi"
lo-pi"
lo-pin
5-pin
(Used on Model 6162)
PlOl
PlO2
P105
P106
P107
P108
PllO
P112
P113
P114
Card-Edge (PC-323)
Card-Edge (PC-323)
Male (10 pins)
Male (10 pins)
Male (10 pins)
Male (10 pins)
Male (5 pins)
Male (10 pins)
Male (5 pins)
Male (10 pins)
Q401
Q402
Q403
Q404
9405
Q406
Q407
Q408
9409
Q410
Q411
Q412
Transistor,
Transistor,
Transistor,
Transistor,
Transistor,
Transistor,
Trannistor,
Transistor,
Transistor,
Transistor,
Transistor,
transistor,
NPN,
NPN,
NPN,
PNP,
PNP,
PNP,
PNP,
PNP,
PNP,
PNP,
PNP,
PNP,
QA401
QA402
QA403
QA404
QA405
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
CLrcuit,
Circuit,
QA406
QA407
QA408
QA409
0577
Case
Case
Case
Case
Case
Case
Case
Case
Case
Case
Case
Case
PC-323)
TO-92
TO-104
TO-104
TO-92
TO-92
TO-92
TO-92
TO-106
TO-106
TO-106
TO-106
TO-106
Hex Inverter,
14-pin DIP
Quad &Input,
NOR 14-pin DIP
Quad NAND, 14-pin DIP
Hex Inverters,
14-pin DIP
Hex Inverters,
14-pin DIP
'Timing Logic,
B-pin DIP
Triple
3-Input
NAND, 14-pin DIP
LsI, 28-pi,, DIP
Hex Inverter,
14-pin DIP
C22-.OlM
c201-.om
c179-4.7LI
c-22-47OOP
RF-28
RF-28
RF-28
RF-28
RF-28
RF-28
DD-15
DD-I4
DD-14
DD-14
DD-14
DO-14
PC-323
PC-323
PC-323
PC-322
PC-322
PC-322
PC-322
PC-322
PC-322
cs-259
cs-259
CS-241
CS-237
CS-237
CS-237
CS-237
CS-251
PC-321
PC-321
PC-321
Display
Display
Display
Display
s401
24249A
24249A
24249A
24249A
24249A
24249A
24249A
24249A
PC-321
PC-321
PC-322
PC-322
PC-321
PC-321
PC-321
PC-321
PC-321
PC-321
X-62
'X-68
W-68
TC-90
TG-90
TG-90
X-90
X-66
Z-66
X-66
'X-66
n-110
PC-321
PC-323
PC-323
PC-223
PC-323
PC-323
PC-323
PC-323
PC-323
PC-323
PC-323
PC-323
IC-62
IC-69
IC-22
K-45
IC-45
IC-71
IC-68
LSI-2
IC-62
PC-323
PC-323
PC-323
PC-323
PC-323
PC-323
PC-323
PC-323
PC-323
PC-323
PC-323
PC-322
PC-323
PC-323
Cable
Cable
Cable
Cable
45
MODEL 616
REPLACEABLE PARTS
COMPONENTDESIGNATION LISTING
parts show" o" Schematic NO. 257788
Keithley
Part Na.
circuie
De&g.
DCXriptiO"
R401
R402
R403
R404
R405
R406
R407
R408
R409
R410
R411
R412
R413
R414
R415
R416
R417
R418
Resistor,
resistor.
Resistor;
Resistor,
Resistor,
Resiaeor,
Resistor.
Resistor;
Resistor,
Resistor,
Resistor.
Resistor;
Resistor,
~esiator,
Resiatar,
Resistor,
Resistor,
Resistor,
RN401
RN402
RN403
RN404
RN405
Resiator,Neewark,
Resistor
Network,
Resiseor Network,
Resist"=
Network,
Resistor
Network,
5401
switch,
l.lKR,
lo%, 1/4W, Come
845fl. 10%. 1/4W, Co"v
715n; l%,~l/&~MtF
715n, l%, 1/8W, MtF
4020, lo%, 1/4W, Comp
4020, lo%, 1/4W, Camp
402a. 10%. 114W. Come
402a; 10%; 1/4W; Corn;
12.4Kn, l%, 1/8W, MtF
715n, l%, 1/8W, MtF
3.01KO. 1%. 1/8W, MfF
l.lKfl,.l%,.l/8W,.MtF
6.04Kn. l%, 1/8W, MtF
ZOKn, l%, 1/8W, MtF
20Kn, 1%. l/gW, MtF
20K0, l%, 1/8W, MtF
2Ow, 1X, 1/8W, MtF
2.2KR. lO%, 1/4w, camp
Rotary
Thick-Film,
Thick-Film,
Thick-Film,
Thick-Film,
Thick-Film,
16-pin
14-pin
Ill-pi"
14-pi"
14-pi"
circuit
Desig.
Descrfptia"
Cl13
Capacitor,
PI04
Card Edge, PC-361
4101
Q107
QlOZA,a
4103
Q104
Transistor,
Transistor,
Transistor,
Transistor,
Transistor,
FET,
FET,
Dual
NPN,
NPN,
QlOl
Integrated
Circuir,
Rl20
R121
R122
R123
~124
Resistor,
Resistor,
Resistor,
Reeistor,
Resistor,
46
O.OOluF,
DIP
DIP
DIP
DIP
DIP
75kfl.
75k0,
1000,
2000,
lOOkn,
'CO-18, Selected
TO-18, Selected
TO-106
TO-106
B-pi"
O.l%,
O.l%,
O.l%,
0.75W,
10%.
TF-41
TF-16
TF-18
TF-19
TF-40
PC-322
PC-323
PC-323
PC-323
PC-323
SW-367
Front
Keithley
Part No.
Incation
C64-.OOlM
PC-361
PC-361
PC-361
Panel
COMPONENTDESIGNATION LISTING
Show" o" Schematic No. 257643
lOOOV, CerD
Case
Case
NPN
Case
Case
RSS-715
R88-715
R88-402
RSE-402
R88-402
RSS-402
RES-12.4K
R88-715
R88-3.01K
R88-l.lK
RES-6.04K
R88-20K
R88-20K
R88-20K
R88-20K
R76-2.2K
PC-322
PC-321
PC-323
PC-323
PC-321
PC-321
PC-321
PC-321
PC-323
PC-323
PC-323
PC-323
PC-323
PC-321
PC-321
PC-321
PC-321
PC-321
;;6gI;i:K
(SENSITIVITY)
Parts
Location
DIP
0.3W
0.3W
1/8W, MtF
Cermet
1/4W, Camp
TG-51
TG-51 >
26612A
< Matched
TG-91
TG-39
TG-39
Pair
PC-361
PC-361
PC-361
PC-361
PC-361
IC-74
PC-361
R212-75K
R212-75K
R168-100
RP89-200
R76-100K
PC-361
PC-361
PC-361
PC-361
PC-361
1175
REPLACEABLE PARTS
MODEL 6162
COMPONENTDESIGNATION LISTING
Parts Shown on Schematic 25715D
circuit
twig.
Description
Cl01
capacitor,
DlOl
0102
D103
D104
D105
D106
0107
Diode
Diode
Diode
Diode
Diode
Diode
Diode
QlOl
QlO2
Q103
Transiatar,
Transistor
Transistor
QAlOl
QA102
QA103
QA104
QA105
QA106
QAlO7
QAlO8
QA109
QAllO
QAlll
QA112
QA113
QA114
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
RlOl
R102
R103
R104
Rlo5
R106
R107
RlO8
R109
RllO
Rlll
R112
R113
R114
R115
R116
Resistor,
Resistor,
Re&?iBmr,
Not Used
Not Used
Not Used
Resistor,
Resistor,
Resisrar,
Redstor.
Resistor,
Resistor,
Resistor,
Resistor,
Resistor,
Resistor,
RN101
Resistor
PlOl
P102
P104
P105
P108
Connector,
Connector,
Connector,
Connector,
Connector,
0476
Mfr.
Code
Mfr.
De&g.
Keithley
Part No.
14752
230BlB505
C245-4M
ITT
ITT
ITT
ITT
ITT
ITT
ITT
lN87
lN87
lNS7
lN87
lN87
lN87
lN87
RF-39
RF-39
RF-39
RF-39
RF-39
RF-39
RF-39
PNP, Case TO-106
NPN, Case TO-92
NPN, Case TO-104
FAIR
MOT
RCA
2N5139
2N5089
2N5183
TG-66
TG-62
TG-68
Circuits,
Circuit,
Circuit,
Circuit,
Circuit.
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
CIrcuIt,
Circuit,
Circuit,
07263
07263
07263
07263
07263
07263
07263
07263
01295
01295
04713
04713
04713
04713
FCD820
FCD820
FCD820
FCDSZO
FCD820
FCD820
FCD820
FCD820
SN74L74N
SN74L74N
MC858P
MC836P
MC836P
MC836P
IC-82
X-82
IC-82
IC-82
IC-82
IC-82
IC-82
IC-82
IC-87
X-87
IC-52
IC-80
X-80
IC-80
3.3K,,, 10X, 1/4W, Comp
lKn, 10%. 1/4W, Camp
4.7KR, 10x;, 1/4w, camp
A-B
A-B
A-S
CB-332-10%
CB-102-10%
CB-472-10%
R76-3.3K
R76-1K
R76-4.7K
3300,
lOKJl,
330*,
33on,
33on,
330*,
3300,
330n,
2.5MG.
lOKn,
01121
01121
01121
01121
01121
01121
01121
01121
CB-331-10%
CB-103-10%
CB-331-10%
CB-331-109:
CB-331-10X
CB-331-10%
CB-331-10%
CB-331-10%
IRC
CEA-TO-1OK
R76-330
R76-10K
R76-330
R76-330
R76-330
R76-330
R76-330
R76-330
RPlOl-2.5M
R88-10K
4llF,
Network,
Male
Male
Male
Male
Male
lOOV, My
Isolator,
6-pin DIP
Isolator,
6-pin DIP
Isolator,
6-pin DIP
Isolator,
6-pin DIP
Isolator,
6-pin DIP
Isolator,
6-pin DIP
Isolator,
6-pi" DIP
Isolator,
6-pin DIP
Flip-Flop,
TTL, lb-pin
DIP
Flip-Flop,
TTL, 14-pin DIP
Quad NAND. 14-pin DIP
l&x InverCer, i4-pi" DIP
Hex Inverter,
14-p** DIP
Hex 1nvereer,
14-p** DIP
10%. 1/4w, camp
10x, 1/4w, camp
10x, 1/4w, camp
10x, 1/4w, camp
lo%, 1/4w, camp
lO%, 1/4w, camp
lO%, 1/4w, camp
10X, 1/4W, Camp
10%. 1/4W, Camp Variable
l%, 1/8W, MtF
Thick-Film,
(10 pins)
(5 pins)
(IO pins)
(10 pins)
(10 pins)
14-pi"
DIP
TF19-4.7K
24249A
242498
24249A
2424911
24249A
47
MODEL 6162
REPLACEABLE PARTS
COMPONENTDESIGNATION LISTING
Parts Show" on Schematic No. 257161)
C201
c202
C203
Capacitor,
Capacitor,
Capacitar,
0201
D7.02
D203
D204
0205
D206
Diode
Diode
Diode
Diode
Diode
Diode
P108
connecror,
q201
Q202
Transistor,
Trensistor,
QA201
QA202
QA203
QA204
QA.205
QA206
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
QA221
QA222
QA223
QA224
QA225
QA226
QA227
QA228
qA229
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Not Used
Integrated
Integrated
Not Used
Integrated
Not Ueed
Integrated
Integrated
Integrated
InreSrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
Integrated
R201
R202
R203
R204
R205
R206
R207
R208
R209
R210
R211
R212
R213
R214
Resistor,
Re.ei*tOr,
Resietor,
Resistor,
Resistor,
Resistor,
Resistor,
Resistor,
Resistor,
Resistor,
Resistor,
Resietor,
Resistor,
Resistor,
33on, 10x, 1/4w, camp
33on, 10x, 1/4w, camp
33Ofl, 10X, 1/4W, Comp
33Os?, 10%. 1/4W, Cymp
33011, 10%. 1/4w, camp
3300, 10%. 1/4w, camp
1m, 10%. 1/4w, camp
lKn, 10X, 1/4W, Comp
lOKO, lo%, 1/4W, Camp
lOKn, lo%, 1/4W, Camp
lOKn, lo%, 1/4W, Camp
lOK& lo%, 1/4W, Coup
lOK& 10X, 1/4W, Comp
lOKn, 10%. 1/4W, Comp
RN201
Resistor
QA207
qA208
QA209
QA210
QA211
QA212
QA213
QA214
QA215
QA216
qA217
qA218
QA219
QA220
48
O.OOluF,
O.OOlvF,
O.OOlvF,
Male
25OV. MtF
25OV, MtF
25OV, MtF
AMPX
AMPX
AMPX
C28OAE
C280AE
CZBOAE
C178-.OOlM
C178-.OOlM
C178-.OOlM
ITT
ITT
ITT
ITT
ITT
ITT
lN87
lN87
lN87
lN87
lN87
lN87
RF-39
RF-39
RF-39
RF-39
RF-39
RF-39
24249A
(10 pins)
MOT
MOT
2N5089
2N5089
TG62
TG-62
BCD Counter,
TTL, 14-pi" DIP
BCD Counter,
TTL, 1Cpin DIP
BCD Counter, TTL, 14-pi" DIP
Quad Latch, TTL, 16-pin DIP
Quad Latch, TTL, 16-pi"
DIP
Quad Latch, TTL, 16-pin DIP
Quad Latch, TTL, 16-pin DIP
Monostable,
14-pin DIP
Monastable,
14-pin DIP
Monostable,
lbpin
DIP
Dual Flip-Flop,
ll-pi"
DIP
Dual Flip-Flop,
Il-pi"
DIP
TEXAS
TEXAS
01295
02763
02763
02763
02763
01295
01295
01295
01295
01295
SN74L90N
SN74L90N
SN74L90N
93L1459X
93L1459X
93L1459X
93L1459X
SN74L122N
SN74L122N
SN74L73N
SN74L74N
IC-84
IC-84
X-84
x-90
IC-90
IC-90
IC-90
IC-83
IC-83
X-83
X-86
X-87
Circuit,
Circuit,
Hex Inverter,
Hex Inverter,
Ill-pi"
14-pin
DIP
DIP
01295
01295
SN74L04N
SN74L04N
IC-85
X-85
Circuit,
Hex Inverter,
ll-pin
DIP
04713
MC836P
IC-80
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Circuit,
Quad NAND Sate, 14-pin
quad NAND Sate, 14-pi"
quad NAND Sate, Ill-pi"
Quad NAND Sate,,U-pin
Dual NAND, 14-pin DIP
Isolator,
6-pin DIP
Isolator,
6-pin DIP
Isolator,
6-pin DIP
Isolator,
6-pin DIP
Isolator,
6-pin DIP
Isolator,
6-pin DIP
04713
04713
04713
04713
04713
07263
07263
07263
07263
07263
07263
MC858P
MC858P
MCS58P
MC858P
MC18OOP
FCD820
FCD820
FCD820
FCD820
FCD820
FCD820
IC-52
X-52
IC-52
IC-52
K-89
IC-82
X-82
IC-82
X-82
X-82
IC-82
01121
01121
01121
01121
01121
01121
01121
01121
01121
01121
01121
01121
01121
01121
CB-331-10X
CB-331-10%
CB-331-10%
CB-331-10%
CB-331-10X
CB-331-10X
CB-lOPlO%
CB-102-10X
CB-103-10X
CB-103-10X
CB-103-10X
CB-103-10X
CB-103-10X
CB-103-10X
R76-330
R76-330
R76-330
R76-330
R76-330
R76-330
R76-1K
R76-1K
R76-10K
R76-10K
R76-10K
R76-10K
R76-10K
R76-10K
NPN, Case TO-92
NPN, Case TO-92
Network
DIP
DIP
DIP
DIP
TF19-4.7K
1175
MODEL 6162
REPLACEABLE PARTS
Parts
COMPONENTDESIGNATION LISTING
Shown a" Schematic No. 25717C
circuit
Mfr.
Code
Mfr.
lksig.
Keithley
Part No.
15238
15238
15238
15238
lN3592
lN3592
lN3592
IN3592
RF-39
RF-39
RF-39
RF-39
De&.
Description
0301
D302
D303
D304
Germanium,
Germa"i"m,
Germanium,
Germanium,
ZO",
ZO",
ZO",
ZOV,
P103
P105
P106
P107
P108
connector,
Co""ector,
connector,
connector,
connector,
Male (10 pins)
Male (10 pins)
Male (10 pins)
Male (10 pins)
Male (10 pins)
QA301
QA302
QA303
QA304
QA305
QA306
QA307
Integrated
Integrated
Integrated
Integrated
Not Used
Integrated
Integrated
Circuir,
Circuit,
Circuit,
Circuit,
Quad NAND
Quad NAND
Decoder, 16-pin DIP
Quad Latch,
16-pin DIP
04713
04713
01295
02763
MCSSSP
Circuit,
Circuit,
Quad NAND
Quad NAND
04713
04713
RN301
Resistor
50
50
50
50
mA
m.4
UlA
mA
2424911
24249A
24249A
24249A
24249A
U-52
MCS58P
IC-52
SN74L42N
93L1459X
X-88
IS90
MC858P
MC858P
IC-52
H-52
Network
TF19-4.7K
COMPONENTDESIGNATION LISTING
Parts Shown on Schematic No. 25823C
CirC”it
Des&g.
Description
c401
C402
c403
c404
c405
C406
c407
C408
c409
c410
c411
C412
O.luF, 25OV, MtF
2000uF, 15v, EAL
2000UF, 15v, EAL
39°F. 15V. E~XV
391F; 15v; Epox;
39uF, 15V, Epoxy
39!dF, 15v, Epoxy
39uF, 15V, Epoxy
39uF. 15v, Epoxy
39pF. 15v, Epoxy
39,,F, 15V, Epoxy
39uF, 15V, Epoxy
D401
D402
DS401
Amber
Mfr.
Code
Mfr.
Dzsig.
Keithley
Part NO.
73445
29309
29309
17554
17554
17554
17554
17554
17554
17554
17554
17554
CZSOAE
JCN200015SP
JCN2000158P
TD401539610
TD401539610
TD401539610
'I'D401539610
TD401539610
TD401539610
TD401539610
TD401539610
I'D401539610
C178-.lM
C210-2000M
C210-ZOOOM
C228-39M
C228-39M
C228-39M
C228-30M
C228-39M
C228-39M
C228-39M
C228-39M
C228-39M
13327
13327
1134139
1134139
RF-34
RF-34
07294
CF03ACS1869
PI.-51
71400
MDL
F"-20
F401
Fuse,
P401
connector,
Power Input
82389
EAC301
CS-254
QA401
Integrated
Circuit,
12040
LM309K
K-34
s401
S402
Switch,
Switch,
T401
Transformer
5401
5402
connector,
Binding Post (Green) GR"UND
connector,
Binding POSt ("lack)
LO
shorting
Link (Used between J401 and 5402)
0577
Sl0-BlO
3AG, 1/8A
Line Voltage
Power ON
Regulator
(117V-234V)
SW-151
SW-236
TR-155
.
.
BP-11-GRN
BP-ll-BLK
BP-6
49
MODEL 616
REPLACEABLE PARTS
TABLE 7-5.
tilectrical
Pate
J&t
list
of electrical
part.3 ie arranged
NOTE: The following
eo that all pats
are grouped by subassembly such ee
printed
circuit
board, switch,
front chassis,
etc.
Camponent layouts
showing physical
positian
of each pert is
furnished
for each printed
circuit
assembly.
The Keithley
pert number should be used whenever replacement
parte are
ordered from Keithley
Instruments
or ire representatives.
MAIN CHASSIS - FRONf PANEL
MISCELLANEOUS
Keithley
Pert No.
25579A
RPlOO-1K
SW-236
SW-309
SW-367
25769A
SW-368
25573A
SW-366
CS-181
Quantity
Per Assembly
1
1
1
1
1
1
1
1
1
1
Description
Mfr.
Knob Assembly (ZERO)
Potentiometer
(ZERO) 1KO
(ON)
Switch, Toggle
Switch, Tag@
(ZERO CHECK)
switch,
Rotary (SENSITIVITY)
Knob Assembly (SENSITIVITY)
Switch, Rotary (RANGE)
Knob Assembly (RANGE)
switch (FAST/NORMAL)
c~nne~e~r, ~ria~id
(INPUT)
80164
--___
80164
80164
80164
80164
80164
80164
80164
95712
Mfr.
Desig.
circuit
Desig.
---____
---------------------33050-2NT34
---_
R119
5202
5102
5401
---SlOl
---s103
5120
RANGE SWITCH
CAPACITORS
Keithley
Pert No.
c31-5P
C138-1OP
C138-22P
C138-47P
C25l-.lM
C252-1OOP
C252-.001M
C252-.OlM
C64-1OP
quantity
Per Assembly
1
1
1
1
t
1
1
1
Description
Mfr.
Mfr.
Desig.
circuit
Deeig.
SpF, ZOOV, Poly
lOpF, SOOV, Poly
22pF, SOOV, Poly
47pF, 5OOV, Poly
O.l!,F, ZOOV, Poly
lOOpF, .63OV, Poly
.OOluF, .63OV, Poly
.OlliF,
.63OV, Poly
lOPF, lOOOV, cerll
00686
71590
71590
71590
97419
97419
97419
97419
71590
E1013-1
CPR-1OJ
CPR-22.3
CPR-47s
PYWR-.l@
B31360-A1101
B31360-A1102
831360~A1103
DD-lOO-10%
Cl01
Cl02
Cl03
Cl04
Cl08
C105,106,107,111
Cl10
Cl09
Cl15
91637
91637
91637
91637
91637
14292
07716
02985
02985
00327
00327
00327
~~-2-108
MFF-1K
R108
R103
R104
R105
R106
Rlo7
Rl12
RlOl
R102
R109
RllO
Rlll
RESISTORS
R169-1K
R169-10K
R169-100K
R169-lM
Rl74-10M
R180-108
R221-9.99
R221-10
R222-10 8
R222-lOlo
R222-1011
50
1
1
1
1
1
1
1
1
1
1
1
1
108a, 1%, 2w, DCb
lKn, 0.1%. l/ZW, MtF
lOKn, 0.14, l/ZW, MtF
lOOKR, 0.1X, 1/2W, MtF
lMO, 0.1%. 1/2W, MtF
lot-m, 0.1%. 1/2w, MtF
1080, 5%, 112~
9.99n, O.l%, low, ww
logo, 0.1%. low, ww
lo&
+3z, -5%, Megox
10 n, +3%, -5%, Megox
1011n, +3%, -5%, Megox
MFF-1OK
MFF-100K
MFF-lM
AME-70-1OM
~~~~2-108
TS-low-g.99
TS-lOW-100
M51-10g
MSl-lOlo
MSl-1011
1175
REPLACEABLE
MDDKL 616
PARTS
MAIN CHASSIS - REAR PANEL
MISCELLANEOUS
Keifhley
Part No.
Quantity
Per Assembly
BP-1IW
BP-UK
BP-11BLK
BP-IlBL"
BP-11GRN
BP-6
FH-11
1
1
2
1
1
1
1
FU-29
FU-40
SW-151
CS-254
1
1
1
1
CO-J
1
Description
Mfr.
Binding Post, Wbite~(Xl)
Binding Post, Red (1V)
Binding Post, Black (LO)
Binding Post, Blue (GUARD)
Binding Post, Green (CASE)
Shorting
Link
Fuse Holder
Fuse,
3AG, Slo-Blo,
ll?V,
3/16A
Fuse,
3AG, Slo-Blo,
234V, l/lOA
Switch (117 - 234V)
Receptacle,
Line Power
Line Cord
58474
58474
58474
58474
58474
24655
75915
75915
75915
80164
a2389
70903
Mfr.
nesig.
CiD2"i.Z
DesiS.
DFZl
DF21
DF21
DF21
DF21
938-L
340877
313.187
313.100s
5121,
5123
EAC301
5122
5119
F201
F201
s201
P201
MOTHER BOARD
PC-321
Keithley
Part No.
CS-236
cs-340-10
CS-241
CS-251
cs-259
CS-267
24249A
CS-270
DZ- 7
RP94-2K
Trl-152
Quantity
Per Assembly
Description
69
6
1
2
2
1
Female Pin
connector,
Connector,
connector,
Connector,
Connector,
81
Male
1
1
1
1
lo-pin
Card-Edge,
5-pin
Card-Edge.
Card-Edge,
Mfr.
Mfr.
De&g.
22526
22526
20052
22-pin
71785
15pin
6-pin
71785
71785
SO164
22526
Pill
CO"neCtOr, 3-pin,
Mini-w
Diode, Zener
Potentiometer,
ZKn, 0.6W
Transformer
47439
2522230240
20370
2521530160
50-6%10
22526
65039-034
04713
18935
94211
80164
50200S-2K
P112,114-116,107-108
5103
P109
5101,102
5104
Jill
D206
R114
TlOl
CAPACITORS
Keithley
Part No.
c22-.olM
czz-.02M
C64-1OOP
Cl??-ZOOM
C179-1OM
C194-270M
C210-ZOOOM
C212-400M
C228-39M
Description
Mfr.
Mfr.
Desig.
4
1
2
2
1
1
2
1
7
O.Ol~F, lOOOV, CerD
0.02"P.
1ooov. CerD
lOOpF, lOOOV, CerD
ZOOPF, 35v, EAL
lOvF, 2OV. ETT
ZJOW,
6V, ETT
ZOOOUF. 15V. EAL
4OOuF, 35V, EAL
39uF, 15V. Epoxy
56289
56289
71590
90201
17554
loss-510
lOSS-S20
DD-loi-10%
XTVZOON35
TSD220106
QULllltity
Per Assembly
:240-4.JM
2
4.?uF,
c179-4.7
1
C240-10
2
4.7,,F, 20". ETT
10liF, 35OV, EAT.
0778
35OV.
SAL
06751
TD5006277-20
29309
29309
17554
JCN200015SP
JC1240035SP
TD401533610
24138
17554
24138
PCK4.7U5350
35OVnlO
CkX"ilC
DeSig.
C220,221,222,223
Cl14
C208,212
C205,207
C214
Cl12
c210,211
C213
C206,209,215,216,
21?,218,219
C201,203
C224
C202, C204
51
REPLACEABLE PARTS
MODEL 616
MOTHER BOARD
PC-321
Keithley
Part NO.
Qvantity
Per Aesembly
Description
Mfr.
Mfr.
De&.
circuit
nesig.
07263
12040
UGA7723393
LM309K
QA201,202
QA203
01121
01121
01121
01121
01121
07716
07716
07716
07716
07716
07716
07716
CB-220
CRA-TO-845
CEA-TO-402
CB-222
CB-105
CF.A-TO-100
CEA-TO-200n
CEA-TO-3.OlKn
CEA-TO-4.02Kn
CEA-TO-6.98Kfi
CEA-TO-lOK0
CEA-TO-LOKfl
07716
07716
91637
91637
91637
91637
91637
00121
CEA-TO-39.2KO
CEC-1.21W2
MFF-l/8-100
MFF-l/8-900
MFP-l/8-1OKR
MMF-l/S-4.99KG
MMF-l/8-7.4Kn
CEA-1.5K
R203
R402
R405, 6, 7, 8
R418
R211,212
R116
R113
R202.207.208.210
R126;127.
R206
R125
R129,130,414,415,
416,417
R128
R201
R118
R117
R115
R204
R205
F.209
TEXAS
01295
13327
83701
04713
18645
lN914
lN4139
PD-10
lN4006
04713
04713
04713
04713
2N5089
D45C3
INTEGRATED CIRCUITS
IC-25
IC-34
2
1
Voltage
Voltage
ReRulator,
Regulator,
ICpin
DIP
Case TO-3
RESISTORS
Rib-22
Rm-a45
R88-402
R76-2.2K
R76-1M
R&3-10
R88-200
RS8-3.0x
RSS-2.49K
RS8-6.9S.K
RSB-1OK
R88-20K
1
1
4
:
1
1
4
2
1
1
6
226?, 10x, 1/4w, camp
8450, 1X, 1/8W, MtF
402R, l%, l/SW, MtF
z.zKn, IO%, 1/4w, camp
lMn, lo%, 1/4w, camp
lOfl, l%, l/BW, MtF
zoon, 1%. l/SW, MtF
3.01m,
1x, UBW, IeF
2.49U,
l%, l/SW, MtF
6.98101, 1X, l/SW, MtF
lOm, 1%, 1/8W, MtF
2OKsi, l%, 1/8W, MtF
R88-39.2K
R94-1.21K
R168-100
R168-900
R168-10K
R176-4.99K
R176-7.4K
R88-1.5K
1
1
1
1
1
1
1
1
39.2K0, l%, 1/8W, MtF
1.2X.0,
l%, l/ZW, MtF
lOOn, 0.1%. 1/8W, MtF
soon;
0.1%; uaw; MtF
lOKn, O.l%, l/BW, MtF
4.99103, O.l%, 1/8W
7.4F.h 0.1%. l/SW
1.5K , l%, l/SW, MtF
DIODES
RF-14
RF-28
RF-34
RF-36
RF-38
1
3
2
1
8
Rectifier,
4OOmA, 225V
Rectifier
Rectifier
Four diode, full-wave
bridge
Rectifier,
l.OA, BOOV
D104
D101.102.103
D207-208.
0205
D201,202,203,204,
209,210,D105,106
TRANSISTORS
TG-62
TG-100
TG-105
TG-93
1
1
2
2
NPN,
PNP,
PNP,
NPN,
R-l-220K
R76-10K
R76-1K
4
2
1
220Ku, 10%. uzw, camp
lOKv, lo%, 1/4w, camp
lKp, 10%. 1/4w, camp
52
Case
Flat
Case
Case
TO-92
Package
TO-5
TO-5
Q401
Q201
&WPS§S2NS416Q106,Q109
m
2N3439 QlO%QlO8
Rl32,133,135,136
R131
R134
0778
S,~,.,“... ..,....,.
-.., ~,,.”-_
.
,.,,, ,. .,_.,.....,, ..,..,_
x-,--._
_‘.‘- -...,., ,...a:
,,^^___~
.,..-.- .,..,,..,.,.
.,.. ~~ ,..,,., ~~,,-...,,~,,~“,,.
!
&
.._
..~.........~.
‘a
;: ,,,.....,
.,
MODEL 616
REPLACEABLE PARTS
DISPLAY BOARD
PC-322
MISCELLANEO"S
Keffhley
Part No.
Quantity
Per Assembly
R-76-l.lK
TF-41
DD-9
DD-11
*Light
1
1
5
1
intensity
"C",
Mfr.
Description
Resistor,
l.lKn,
10%. 1/4W, Camp
Resistor
Network,
16-pin DIP
Digital
Display
(Seven Segment)*
Digital
Display
(Overrange)*
"D",
01121
CTS
H-P
H-P
Mfr.
De&?.
C*rC"it
uesig.
CBIlZ-10%
Special
RN401
5082-7730
5082-7732
DN432,3,4,5,6
DN4Ql
R401
or "E"
CAPACITORS
c22-.olM
CZOl-.olM
1
1
O.OlvF,
O.OluF,
5OOV, CerD
5OV, MPCb
FIGURE 36.
1175
~mponenr
‘ayout,
72982
87125UO103M
c401
14752
625Bl.A
C402
PC-322.
55
REPLACEABLE PARTS
MODEL 616
LOGIC BOARD
PC-323
INTEGRATED CIRCUITS
Keithley
Part No.
quantity
Per Assemblv
Description
Mfr.
Mfr.
De&g.
circuit
Desig.
IC-22
IC-45
IC-62
IC-68
IC-69
IC-71
1
2
2
1
1
1
Quad NAND, 14-pin DIP
Hex 1nverter.3,
1Cpin DIP
Hex Inverter,
14-pin DIP
Triple
3-Input
Positive
NAND, 14-pin DIP
Quad Z-Input
Positive
NOR, 14-pin DIP
Timing Logic, E-pin DIP
04713
01295
01295
01295
01295
18324
MCS58P
SN7403N
SN7406
SN7412N
SN74LOZN
NE555V
QA403
QA404.405
QA401,409
QA407
QA402
QA406
LSI-2
1
Integrated
80164
-----
QA408
07716
07716
07716
07716
07716
CEA-715n
CEA-l.lKR
CEA-3.OlKn
CEA-6.04Kn
CFA-12.4KQ
R410,403,404
R412
R411
R413
R409
01295
lN914
0401,
73138
1899-151.0
RN402
73138
73138
CTS
1899-152-O
899-l-RZK
Special
RN403
RN404
RN405
07263
02735
04713
07263
2N5139
2N5183
2N404A
2N5140
Q4OS,409,410,411
Q402,403
Q~O4,405,406,407
Q412
72982
87125U0103M
14752
625BlA
c401
c404
C402
Circuit
RESISTORS
R88-715
R88-l.lK
R&3-3.01K
RBB-6.04K
R88-12.4K
3
1
1
1
1
7150,
l%, l/SW, MtF
l%, 1/8W, MtF
3.01K& l%, l/SW, MtF
6.04Kfl. l%, 1/8W, MtF
12.4Kn, l%, l/SW, MtF
l.lKn,
DIODES
RF-28
5
403-406
RESISTOR NETWORKS
m-16
1
Thick
Film,
Ill-pin
DIP
1
1
1
Thick Film, 14-pin DIP
Thick Film, 14-pin DIP
Resistor
Network,
14-pin
DIP
TRANSISTORS
TG-66
TG-68
TG-90
TG-110
4
2
4
1
PNP,
NPN,
PNP,
PNP,
Case
Case
Case
Case
TO-106
TO-104
TO-92
m-106
CAPACITORS
C22-.OlM
C22-4700P
C201-.OlM
56
1
1
O.OlvF, 5OOV, CerD
4700PF, SOOV,CerD
O.OluF, 5OV, MPCb
0577
REPLACEABLEPARTS
MODEL 616
FIGURE 37.
0577
Component Layout,
PC-323.
(Logic
Board)
57
MODEL 616
RANGING BOARD
PC-324
CAPACITORS
Keithley
Part NO.
C64-330P
C178-.1M
CZOl-.OlM
CZOl-.lM
CZZS-39M
C237-.33M
C245-lb,
CZZ-.0033M
quantity
Per Assembly
1
1
1
1
3
1
1
2
Description
Mfr.
Mfr.
Desig.
CiK"it
tleslg.
330DF. 1oov. CerD
O.lnF, 25OV; MtF
O.Ol,,F, 5OV, MPC
O.l!,F, 50". MPC
39UF, 15V, Epoxy
0.33pF, 50", CWF
l.O,,F, lOOV, My
.0033$,
500". CerD
71590
73445
14752
14752
17554
72982
14752
72982
In-331
C280AE
625BlA.01
625BlA.l
TO401539610
8131050651334M
230818105
SOlZ5"0332M
c301
C308
c310
c311
C302,303,307
C309
c305
C304,306
06751
02195
FSA2619M
lN937
lN914
DN301
0304
0301-303
12040
02735
32293
07263
07263
LM301AN
CA3086
ITS6214
Special
Saecial
QA305
QA306
QA301
QA302,303
QA304
01121
07716
07716
07716
91637
73138
73138
73138
73138
73138
CB-103-104
CEA-lK0
CEA-2KR
CEA-80.6Kn
MFF-l/8-61.9Kn
89P-5OOn
89P-1Kn
89P-2KR
89P-10Kn
89%lM2.
R312
R306
R310
R313
R301,302
R304.305
R307,309
R311
R308
R303
80164
80164
73138
80164
--------1898.64-O
-----
RN303
RN304
RN302
RN301
04713
32293
2N5087
ITS3538A
q306
32293
ITS30092
07263
2N5140
Q301
Q307
MISCEILANEO”S
m-2
Lx-41
RF-28
1
1
3
Diode Network, B-pin
Diode, Zener, 9V
Diode, Rectifier
DIP
1NTEGRATED C*RC”ITS
IC-24
x-53
IC-74
IC-76
x-77
1
1
1
2
1
Analog Amplifier,
S-pin DIP
Transistor
Array,
Ill-pin
DIP
Operational
Amplifier,
E-pin DIP
Operational
Amplifier,
S-pin DIP
Operational
Amplifier,
S-pin DIP
RESISTORS
R76-10K
R88-1K
RSS-2K
R88-80.6K
Rl68-61.9~
RP89-500
RP89-1K
RP89-2K
RP89-10K
RP89-1Mn
1
1
1
1
2
2
2
1
1
1
lOKn, lo%, 1/4W, Camp
IKO, 1%. l/SW. MeF
ZKR, l%, 1/8W, MfF
80.6Kn, I%, 1/8W, M~F
61.9Kn, 0.1%. 1/8W, M~F
Poeentfameter,
soon, .75W
Potentiometer,
lKR, .75W
Potentiometer,
ZKfl, .75W
Potentiometer,
lOKn, .75W
Potentiometer,
lMn, .75"
RESISTOR NETWORKS
TF-2
TF-3
TF-5
TF-15
1
1
1
1
Thick-Film,
Thick-Film,
Thick-Film,
Thick-Fillll
'IG-61
TG-97
TG-98
TG-110
1
4
1
1
PNP, Case TO-92
N-Channel J-FET, Case TO-18
Dual N-Channel J-FET, Case TO-71
PNP, Case TO-106
58
16-pin
1Cpin
16-pin
DIP
DIP
DIP
q302,303,304,305
0577
MODEL 616
REPLACEABLEPARTS
FIGURE 38.
1175
Conponent Layout,
PC-324.
(Ranging Board)
59
MODEL 616
REPLACEABLE PARTS
INPUT FET BOARD
PC-361
MISCELLANEOUS
Keithley
Part No.
C64-.OOlM
IC-74
quantity
Per Assembly
1
1
Description
Capacitor,
Integrated
.OOlpF,
Circuit,
Mfr.
lOOOV, CerD
S-pin DIP
Mfr.
Desk.
circuit
Desig.
72902
32293
80800025R0
Cl13
ITS6214
qAlO1
01121
18612
CB-104-10%
V53-l-75KR
MFF-l/8-100
89P-2OOn
R124
R120,121
R122
R123
RESISTORS
R76-100K
R212-75K
R168-100
RP89-200
1
lOOKs2, 10x,
2
75Kfi,.O.l%,
1/4w,
0.3w
1
1
lOOn, O.l%,
1/8W, MtF
91637
2oon.
cermet
73138
.75w,
Camp
TRANSISTORS
TG39
TG91
2
26612A
1
1
NPN, Case TO-106
Dual NPN, Case
07263
2N3565
32293
IT121
Q103,104
Q102
Matched pair,
FET, Case TO-18
(selected
TG-51)
RAY
RN1030
q101,
FIGURE 39.
Component Layout,
q107
~-361.
0476
SCHEMATICS
MODEL 616
SCHEMATICS
Schematic diagrams
Model 6162 Isolated
are furnished
to describe
Output Control.
the Model 616 Digital
Electrometer
and the
MODEL 616
Schematic No.
25777D
25776~
257643
257783
Power Supply
Autoranging
Electrometer
LSI Circuit,
Description
Page
for Model 616
Amplifier
Amplifier
Digital
Logic
63
64
65
66
Description
Page
MODEL 6162
Schematic No.
25715D
25716D
25717C
25823C
1175
Isolated/Output,
Isolated/Output.
Isolated/Output,
Power Supply for
Ranging
Data Lines
Decimal Point,
Model 6162
Function
67
68
69
70
61
/ -\
Y
r
-___---------------I
r--------------~~
I,
I-
-r--
t-+-i...:,
--t-T
l-l
I I I I
I
I
I
I
1
-
I T
I
..^.
I
..^.
_“.
6f
-7
Z/*3
+
6”::
llb3
6x-o/m
+
+
SE6Ob3
c-*om
+
6E-9om+
GE-+
6f
Lam+
__
-
bOb3
+
sofa+
KEITHLEY INSTRUMENTS, INC.
28775 AURORA ROAD
CLEVELAND, OHIO 44139
SERVICE
SERIAL NO.
MODEL NO.
FORM
P.O. NO.
DATE
NAME
PHONE
COMPANY
ADDRESS
El
CITY
Describe
readings,
problem and symptoms using
chart recordings,
etc.)
STATE -ZIP
quantitative
data
(Attach
whenever
additional
El
Show a block diagram of your measurement system including
(whether
power is turned on or not).
Also describe
signal
El
List the positions
the instrument.
El
Describe
EJ
List
controls
and switches
on both
signal
source
levels,
and describe
all
cables
used in the experiment
El
List and describe
for each.
all
other
El
Environment:
Where is the measurement being
out-of-doors,
etc.)
What power line voltage
is u
Ambient temperature?
Other
El
input
of alJ
Additional
Information.
please describe
below.)
(If
equipment
special
frequencies,
possible
sheets
"F.
Variation?
modifications
as necessary).
all instruments
source.
front
and rear
connected
panels
of
etc.
(length,
shielding,
used in the experiment.
performed?
(enclose
(Factory,
Give
controlled
OF. Rel.
etc.).
control
settings
laboratory,
Humidity?
have been made by the user,
REV 0774
Addendum
28039-B-l
Page 1 of 3
l/3/83
Instruction
Manual Addendum
Model 818 IXgital Electrometer
The following information is supplied as a supplement to this manual in order to provide the user with
the latest improvements in the least possible time. It is recommended that the information supplied in
this addendum be incorporated into the appropriate places in the manual immediately.
Description
Of Changes
Most changes included with this addendum concern the plug-in pre amp (PC-3611, which is replaced
with one of two versions of the pre amp (PC-601 or PC-602). Additionally, some parts elsewhere in
the instrument have been changed, added, or deleted.
The following schematic diagram has been ?JviSed and is included with this addendum: Electrometer
Amplifier, drawing number 25764E. page 65.
Component
Layout
Changes
Delete Figure 39 of the manual (PC-361) end replace it with component
32048 (PC-601) and 32053 (PC-6021.
layout drawing numbers
Parts List Changes
1, Delete the PC-381 parts list of the manual on page 60 and replace it with Table 1 of this addendum.
2. PC-321, parts list, page 51: Change parts as listed in Table 2.
28039-B-1
Page 2 of 3
Table 1. Parts List For PC-601 and PC-602
Circuit
Desig.
Cl13
Cl17
QlOl”
QlOl””
Q102
0103
Q104
Q107’
R120
R121
R122
R123
R124
R137
UlOl
Description
Capacitor, 0.01&F, *20%, 5OOV. Ceramic Disc
Capacitor, 1OpF. *20%, lOOOV, Ceramic Disc
Transistor, matched pair with Cl107
Transistor, Selected
Transistor, Dual NPN, IT121
Transistor, NPN Silicon, 2N3565
Transistor, NPN Silicon, 2N3565
Transistor, matched pair with QlOl
Resistor, 75kn. 0.1%. l/low
Resistor, 75k0, O.l%, l/low
Resistor, lOOn, 0.1%. l/EW, Metal Film
Potentiometer, 2000, 0.75W
Resistor, lOOk0, 5%,1 l4W. Composition
Resistor, 20kR. 5%. 1l4W. Composition
IC, Operational Amplifier, 8-pin DIP, ITS8214
Pre Amp, assembled with all parts
Keith@
Part No.
c-22-.01
C-64.1OpF
A26812”
A31484””
TG-91
TG-39
TG-39
A26612*
R-212.75k
R-212.75k
R-168-100
RP-89-200
R-76-100k
R-76.20k
IC-74 *
32053t
*PC-802 only
“‘PC-601 only
t PC-321 must be modified if used in place of PC-361
Table 2. PC-321 Parts Changes
Circuit
Desig.
Cl12
Cl14
C206
c209
C214
C215
C216
C217
C218
c219
R128
T
Action
Changed
Changed
Changed
Changed
Changed
Changed
Changed
Changed
Changed
Changed
Deleted
Description
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor,
Capacitor.
Capacitor,
25Op.F. 25V. Aluminum Electrolytic
1OOOpF. 1OOV. Ceramic Disc
47pF. 18V, Aluminum Electrolytic
47f1F. 16V. Aluminum Electrolytic
lO@F, 25V. Aluminum Electrolytic
47rF, 16V, Aluminum Electrolytic
47pF, 16V. Aluminum Electrolytic
47rF, 16V. Aluminum Electrolyitc
47wF. 18V. Aluminum Electrolytic
47pF, 16V. Aluminum Electrolytic
Keithley
Part No.
C-314-250
c-641OOOpF
C-321-47
C-321-47
c-314-10
C-321-47
C-321-47
C-321-47
C-321-47
C-321-47
28039-B-l
Page 3 of 3
Figure 39. Component
Layout,
PC-801
Figure 39. Component
Layout,
PC-602
*b
I
.
I
I
’
1
-
<
:
KEITHLE17
INSTRUMEN’T’S.
INC
P?tgelofl
0173
a.-
INSTRUCTION IUNUAL
CHANGENOTICE
MODEL 616 DIGITAL ELECTROMETER
Instruments
is continually
improving product
INTRODUCTION: Since Keithley
performa~~nd~reliability,
it is often necessary to make changes to
Instruction
Manuals to reflect
these improvements.
Also, errors in' Instruction Manuals occasionally
occur that require
changes,
Sometimes, due to
printing
lead time and shipping requirements,
we can't get these changes
imediately
into printed Manuals.
The following
new change information
is
supplied as a,supplement to this Manual in order to provide the user with
the latest
improvements and corrections
i? the shortest
possible
time.
Many users vi11 transfer
this change information
directly
to a manual to
minimize user error.
All changes or additions
sre indicated
in ituzics.
CKANGES:
Specifications.
ISOLATION: Circuit
Lo to chassis
ZOy ohms shunted by 500 picofarads
(dzzrcasir,g
at 30°C and 70% relative
humidity).
Page iv:
greater
c&w
than
‘I
growxi;
ta iv