Hewlett-Packard PP-7548 6205B Power Supply TECHNICAL MANUAL
The HP 6205B is a versatile and powerful power supply designed to meet the demanding requirements of a wide range of applications. The programmable output provides precise voltage and current control, making it ideal for testing and powering sensitive electronic devices. The HP 6205B also features a variety of protection circuits to ensure the safety of both the user and the equipment being powered.
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TECHNICAL MANUAL
OPERATOR’S ORGANIZATIONAL
DIRECT SUPPORT AND GENERAL SUPPORT
MAINTENANCE MANUAL
[INCLUDING REPAIR PARTS
AND SPECIAL TOOLS LISTS]
POWER SUPPLY PP-7548/U
(HEWLETT-PACKARD MODEL 6205B]
[NSN 6625-00-437-4861]
HEADQUARTERS, DEPARTMENT OF THE ARMY
25 FEBRUARY 1980
WARNING
HIGH VOLTAGE is used during the performance of maintenance as instructed in this manual. DEATH ON CONTACT may result if personnel fail to observe safety precautions.
DO NOT ATTEMPT to make internal connections or perform adjustments unless another person, capable of performing first aid, is present.
For electric shock protection, use only extension cord and power receptacles with a safety-ground connector, or otherwise connect the chassis to a safety ground.
CERTIFICATION
The Hewlett-Packard Company certifies that this instrument was thoroughly tested and inspected and found to meet its published specifications when it
W as shipped from the factory. The Hewlett-Packard Company further certifies that its calibration measurements are traceable to the U.S. National Bureau of
Standards to the extent allowed by the Bureau’s calibration facility.
WARRANTY AND ASSISTANCE
All Hewlett-Packard products are warranted against defects in materials and workmanship. This warranty applies for one year from the date of delivery, or, in the case of certain major components listed in the operating manual, for the specified period. We will repair or replace products which prove to be defective during the warranty period. No other warranty is expressed or implied. We are not liable for consequential damages.
T M 1 1 - 6 6 2 5 - 2 9 6 5 - 1 4 & P
This manual contains copyright material reproduced by permission of Hewlett-Packard Company
T
ECHNICAL
M
A N U A L
No. 11-6625-2965-14&P
HEADQUARTERS
DEPARTMENT OF THE ARMY
W ASHINGTON, DC, 25 February 1980
OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT AND
GENERAL SUPPORT MAINTENANCE MANUAL
(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS)
POWER SUPPLY PP-7548/U (HEWLETT-PACKARD MODEL)
( N S N 6 6 2 5 - 0 0 - 4 3 7 - 4 8 6 1 )
REPORTING OF ERRORS
Y
OU can improve this manual by recommending improvements using DA Form 2028-2 located in the back of the manual. Simply tear out the self-addressed form, fill it out as shown on the sample, fold it where shown, and drop it in the mail.
If there are no blank DA Forms 2028-2 in the back of your manual, use the standard DA
Form 2028 (Recommended Changes to Publications and Blank Forms) and forward to the
Commander, US Army Communications and Electronics Materiel Readiness Command, ATTN:
DRSEL-ME-MQ, Fort Monmouth, NJ 07703.
In either case a reply will be furnished direct to you.
This manual is an authentication of the manufacturer’s commercial literature which, through usage, has been found to cover the data required to operate and maintain this equipment. Since the manual was not prepared in accordance with military specifications, the format has not been structured to consider levels of maintenance.
TM 11-6625-2965-14&P
TABLE OF CONTENTS
Section Page No.
O INSTRUCTIONS . . . . . . . . . . . . . . . . 0-1
0-l Scope 0-1
0-2 Indexes of Publications 0-1
0-3 Maintenance Forms,
Records and Reports
0-1
0-4 Reporting Equipment
Improvement Recommendations (EIR)
0-1
0-5 Administrative Storage 0-1
0-6 Destruction of Army
Electronics Materiel 0-1
I GENERAL INFORMATION . . . . . . . . . . . 1-1
Description
1 - 6 S p e c i f i c a t i o n s 1-1
1-12 Instrument and Service Man-
ual Identification
1-15 Ordering Additional Manuals 1-2
II INSTALLATION . . . . . . . . . . . . . . . . . . . 2-1
Initia1 Inspection
Mechanical Check
Electrical Check
Installation Data
Location
Outline Diagram
Rack Mounting
Input Power Requirements
Connections for 230 Volt
Operation
Power Cable
Repackaging for Shipment
I I I OPERATING INSTRUCTIONS . . . . . . . . 3-1
Turn-on Checkout Procedure
Operating Modes
Norma1 Operating Mode
Constant Voltage
Changing Current Limit
Connecting Load
Operation Beyond Norma 1
Rated Output
Optional Operating Modes
Remote Programming, Constant Voltage
Remote Sensing
Series Operation
Auto-Tracking Operation
Section
Special Operating Considerations
Pulse Loading
Output Capacitance
Reverse Voltage Loading
Reverse Current Loading
Page No.
IV PRINCIPLES OF OPERATION . . . . . . . . 4-1
4-15 Constant Voltage Comparator 4-2
4-19 Error Amplifier and Driver
V MAINTENANCE . . . . . . . . . . . . . . . . . . . 5-1
Introduction
General Measurement
Techniques
Test Equipment Required
Performance Test
Constant Voltage Tests
Output Impedance
Troubleshooting
Overa11 Troubleshooting
Procedure
Repair and Replacement
Adjustment and Calibration
Meter Zero
Ammeter Tracking
Constant Voltage Programming
Current
Reference Circuit Adjustments
Constant Voltage Transient
Recovery Time
Current Limit Adjustment
VI REPLACEABLE PARTS . . . . . . . . . . .
APPENDIX A
B
C
D
VII CIRCUIT
References
A-1
Components of End
Item
B-1
Maintenance
Allocation
C-1
Manual
backdating
Changes
DIAGRAMS ........... 7-1
i i
TM 11-6625-2965-14&P
LIST OF ILLUSTRATIONS
Figure
Outline Diagram
Rack Mounting, Two Units
Rack Mounting, One Unit
Page No.
Primary Connections
Front Panel Controls and Indicators 3-1
Normal Strapping Pattern
Current Limit Alteration
R e m o t e R e s i s t a n c e P r o g r a m m i n g 3 - 3
Remote Voltage Programming
Remote Sensing
Norma I Series Connections
Auto-Series, Two and Three Units 3-4
Auto-Parallel, Two and Three
Units
Auto-Tracking, Two and Three
Units
Overa11 Block Diagram
Figure
Output Current Measurement
Technique
Page No.
Multiple Range Meter Circuit,
Simplified Schematic
Front Panel Terminal Connections 5-1
Differential Voltmeter Substitute,
Test Setup
Output Current, Test Setup
Load Regulation, Test Setup
CV Ripple and Noise, Test Setup 5-5
CV Noise Spike, Test Setup
Transient Recovery Time,
Test Setup
Transient Recovery Time,
Waveforms
Output Impedance, Test Setup
Servicing Printed Wiring Boards
LIST OF TABLES
Table
Page No.
5-2 Reference Circuit Troubleshooting
5-4 High Output Voltage Troubleshooting
5-5 Low Output Voltage Troubleshooting
5-6 Selected Semiconductor Characteristics
5-7 Checks and Adjustments After Replacement of Semiconductor Devices 5-12
6-3 Code List of Manufacturers
i i i
TM 11-6625-2965-14&P
SECTION O
INSTRUCTIONS
0-1.
SCOPE
This manual applies directly to Power Supply PP-7548/U (Hewlett-Packard
Model 6205) having serial prefix number 7L2301 and up.
For serial prefixes below 7L2301 refer to Appendix E.
For serials above 7L4450 check for inclusion of change page.
0-2.
INDEXES OF PUBLICATIONS a.
DA Pam 310-4.
Refer to the latest issue of DA Pam 310-4 to determine whether there are new editions , changes, or additional publications pertaining to the equipment.
b.
DA Pam 310-7.
Refer to DA Pam 310-7 to determine whether there are modification work orders (MWO
S
) pertaining to the equipment.
0-3.
MAINTENANCE FORMS, RECORDS AND REPORTS a.
Reports of Maintenance and Unsatisfactory Equipment.
Department of the Army forms and procedures used for equipment maintenance will be those described by TM 38-750, The Army Maintenance Management System, b.
Report of Packaging and Handling Deficiencies.
Fill out and forward
DD Form 6 (Packaging Improvement Report) as prescribed in AR 700-58/
NAVSUPINST 4030.29/AFR 71-12/MCO P4030.29A, and DLAR 4145.8.
c.
Discrepancy in Shipment Report (DISREP) (SF 361). Fill out and forward Discrepancy in Shipment Report (DISREP) (SF 361) as prescribed in
AR 55-38/NAVSUPINST 4610.33B/AFR 75-18/MCO P461O.19C and DLAR 4500.15.
0 - 4 .
REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS(EIR)
If your Power Supply PP-7548/U (HP-6205) needs improvement, let us know.
Send us an EIR.
You, the user, are the only one who can tell us what you don’t like about your equipment.
Let us know why you don’t like the design.
Tell us why a procedure is hard to perform.
Put it on an SF 368 (Quality
Deficiency Report).
Mail it to Commander, US Army Communications and
Electronics Materiel Readiness Command and Fort Monmouth, ATTN: DRSEL-ME-
MQ, Fort Monmouth, New Jersey 07703. We'll send y O u a reply.
0 - 5 .
ADMINISTRATIVE STORAGE
Administrative storage of equipment issued to and used by Army activities
shall be in accordance with paragraph 2-5.
0-6.
DESTRUCTION OF ARMY ELECTRONICS MATERIEL
Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM 750-244-2.
0-1
TM 11-6625-2965-14&P
1-1 D E S C R I P T I O N
1-2
This power supply, Figure 1-1, is completely
transistorized and suitable for either bench or relay rack operations, The dual supply consists of two independently controlled dual range sections; both identical to the other. Each section can furnish either a 0-40 Volt output at 300mA or a 0-20
Volt output at 600mA.
Each section has its own front panel meter and operating controls, The operating modes (40V or 20V) are selected by means of the front panel RANGE switches, The VOLTAGE controls permit each output voltage to be continuously adjusted throughout either output range.
Figure 1-1.
DC Power Supply, Model 6205B
1-3 Both sections of the supply are of the regulated, Constant Voltage/Current Limiting, type.
Each section is fully protected from overloads by the fixed current limit which is set by means of an internal adjustment.
1-4 Both front and rear terminals are available for each section. Either the positive or negative terminals may be grounded or the supply can be operated at up to a maximum of 300 Volts off ground.
Each meter can be used to measure either output voltage or output current in one of two ranges. The voltage or current ranges are selected by the applicable METER switch on the front panel.
1-5 Two sets of programming terminals, located at the rear of the unit, allow ease in adapting to the many operational capabilities of the supply. A brief description of these capabilities is given below: a, Remote Programming, The power supply may be programmed from a remote location by means of an external voltage source or resistance.
b. Remote Sensing.
The degradation in regulation which would occur at the load because of the voltage drop which takes place in the load leads can be reduced by using the power supply in the remote sensing mode of operation.
c. Series and Auto-Series Operation, Power supplies may be used in series when a higher output voltage is required in the voltage mode of operation or when greater voltage compliance is required in the constant current mode of operation,
Auto-Series operation permits one knob control of the total output voltage from a “master” supply.
d. Parallel and Auto-Parallel Operation, The power supply may be operated in parallel with a similar unit when greater output current capability is required. Auto-Parallel operation permits one knob control of the total output current from a
“master” supply.
e. Auto-Tracking.
The power supply may be used as a “master” supply, having control over one
(or more) “slave” supplies that furnish various voltages for a system.
1-6 SPECIFICATIONS
1-7 Detailed specifications for the power supply
1 - 8 O P T I O N S
1-9 Options are factory modifications of a standard instrument that are requested by the customer.
The following options are available for the instrument covered by this manual, Where necessary, detailed coverage of the options is included throughout the manual.
Option No.
07
Description
Voltage 10-Turn Pot: A single control that replaces both coarse and fine voltage controls and improves output nettability.
11 Overvoltage_Protection_“Crowbar”:
A completely separate circuit for protecting delicate loads against power supply failure or operator error. This independent device monitors the output voltage and within 10µsec imposes a virtual short-circuit (crowbar) across the power supply output if the preset
1 1
TM 11-6625-2965-14P trip voltage is exceeded. When Option 11 is requested by the customer the device is connected at the factory.
Trip Voltage Range: 2.5 to 44 Volts, screwdriver adjustable.
Detailed coverage of Option 11 is in-
cluded in Appendix A at the rear of
manuals that support power supplies containing Option 11.
13
28
Three Digit Graduated Decadial
Voltage Control: Control that replaces coarse and fine voltage controls permitting accurate resettability.
230Vac Input: Supply as normally shipped is wired for l15Vac input.
Option 28 consists of reconnecting the input transformer for 230Vac operation.
1-10 ACCESSORIES
1-11 The accessories listed in the following chart may be ordered with the power supply or separately from your local Hewlett-Packard field sales office
(refer to list at rear of manual for addresses).
C05
Description
8” Black Handle that can be attached to side of supply.
14513A Rack Kit for mounting one 3½” high
supply. (Refer to Section II for de-
tails.)
14523A Rack Kit for mounting two 3½” high
supplies. (Refer to Section II for de-
tails.)
1-12 INSTRUMENT AND SERVICE MANUAL
IDENTIFICATION
1-13 Hewlett-Packard power supplies are identified by a three-part serial number tag. The first part is the power supply model number. The second part is the serial number prefix, which consists of a number-letter combination that denotes the date of a significant design change. The number designates the year, and the letter A through
L designates the month, January through December respectively, with “I” omitted. The third part is the power supply serial number.
1-14 If the serial number prefix on your power supply does not agree with the prefix on the title page of this manual, change sheets are included to update the manual. Where applicable, backdating information is given in an appendix at the rear of the manual.
1-15 ORDERING ADDITIONAL MANUALS
1-16 One manual is shipped with each power supply, Additional manuals may be purchased from your local Hewlett-Packard field office (see list at rear of this manual for addresses). Specify the model number, serial number prefix, and Part number provided on the title page.
1-2
TM 11-6625-2965-14&P
INPUT: l15Vac ±10%, single phase, 48-440 Hz.
OUTPUT:
Two independent outputs, each of which can be set at either 0-40 Volts @ 0.3 Amp or 0-20
Volts @ 0.6 Amp.
LOAD REGULATION:
Less than 0,01% plus 4mV for a full load to no load change in output current.
LINE REGULATION:
Less than 0.01% plus 4mV for any line voltage change within the input rating.
RIPPLE AND NOISE:
Less than 200µVrms 1mV p-p,
TEMPERATURE RANGES: operating: 0 to 50°C. Storage: -40 to + 75 0 C .
TEMPERATURE COEFFICIENT:
Less than 0.02% plus lmV per degree Centigrade.
STABILITY.
Less than 0.10% plus 5mV total drift for 8 hours after an initial warm-up time of 30 minutes at constant ambient, constant line voltage, and constant load.
INTERNAL IMPEDANCE AS A CONSTANT VOLT-
AGE SOURCE:
Less than 0.02 ohms from dc to lkHz.
Less than 0.5 ohms from lkHz to 1OOkHz.
Less than 3.0 ohms from 1OOkHz to lMHz.
TRANSIENT RECOVERY TIME:
Less than 50µsec for output recovery to within 10mV following a full load current change in the output.
OVERLOAD PROTECTION:
A fixed current limiting circuit protects the power supply for all overloads including a direct short placed across the terminals in constant voltage operation.
METERS:
Each front panel meter can be used as either a
Table 1-1.
Specifications
0-50 or 0-5 Volt voltmeter or as a 0-0.75 or
0.075 Amp ammeter.
OUTPUT CONTROLS:
RANGE switches select desired operating mode for each section and coarse and fine VOLTAGE controls set desired output voltages.
OUTPUT TERMINALS:
Six “five-way” output posts (three for each section of supply) are provided on the front panel and two output terminal strips (one per section) are located on the rear of the chassis.
A1l power supply output terminals are isolated from the chassis and either the positive or negative terminals may be connected to the chassis through separate ground terminals located on the output termina1 strips.
ERROR SENSING:
Error sensing is normally accomplished at the front terminals if the load is attached to the front or at the rear terminals if the load is attached to the rear terminals. Also, provisions are included on the rear termina1 strips for remote sensing.
REMOTE RESISTANCE PROGRAMMING:
200 ohms per Volt.
REMOTE VOLTAGE PROGRAM MING:
1 Volt per Volt.
COOLING:
Convection cooling is employed. The supply has no moving parts.
SIZE:
3 ~ ½ " H x 12-5/8 " D x 8½ " W. Two of the units can be mounted side by side in a standard 19” relay rack.
WEIGHT:
10 lbs, net, 13 lbs. shipping.
FINISH:
Light gray front panel with dark gray case.
POWER CORD:
A three-wire, five-foot power cord is provided with each unit.
1-3
TM 11-6625-2965-14&P
SECTION II
INSTALLATION
2-1 INITIAL INSPECTION
2-2 Before shipment, this instrument was inspected and found to be free of mechanical and electrical defects. As soon as the instrument is unpacked, inspect for any damage that may have occurred in transit. Save all packing materials until the inspection is completed. If damage is found, a claim should be filed with the carrier.
Hewlett-Packard Sales and Service office should be notified.
2-3 MECHANICAL CHECK
2-4 This check should confirm that there are no broken knobs or connectors, that the cabinet and panel surfaces are free of dents and scratches, and that the meter is not scratched or cracked.
2-5 ELECTRICAL CHECK
2-6 The instrument should be checked against its electrical specifications. Section V includes an
“ in-cabinet” performance check to verify proper instrument operation,
2-7 INSTALLATION DATA
2-8 The instrument is shipped ready for bench operation. It is necessary only to connect the instrument to a source of power and it is ready for operation.
2-9 LOCATION
2-10 This instrument is air cooled. Sufficient space should be allotted so that a free flow of cooling air can reach the sides and rear of the instrument when it is in operation. It should be used in an area where the ambient temperature does not exceed 50°C.
2-11 OUTLINE DIAGRAM
2-12 Figure 2-1 is an outline diagram showing the
dimensions of the instrument.
2-13 RACK MOUNTING
2-14 This instrument may be rack mounted in a standard 19 inch rack panel either alongside a
similar unit or by itself. Figures 2-2 and 2-3 show
Figure 2-1.
Outline Diagram how both types of installations are accomplished.
2-15 To mount two units side-by-side, proceed as follows: a .
Remove the four screws from the front panels of both units.
b. Slide rack mounting ears between the front panel and case of each unit.
c .
Slide combining strip between the front panels and cases of the two units.
d. After fastening rear portions of units together using the bolt, nut, and spacer, replace panel screws.
2-16 To mount a single unit in the rack panel, proceed as follows: a.
Bolt rack mounting ears, combining straps, and angle brackets to each side of center
2-1
Figure 2-2.
Rack Mounting, Two Units
Figure 2-3.
Rack Mounting, One Unit
TM 11-6625-2965-14&P
TM 11-6625-2965-14&P spacing panels. Angle brackets are placed behind
combining straps as shown in Figure 2-3.
b. Remove four screws from front panel of unit.
c.
Slide combining strips between front panel and case of unit.
d. Bolt angle brackets to front sides of case and replace front panel screws.
2-17 INPUT POWER REQUIREMENTS
2-18 This power supply may be operated from either a nominal 115 Volt or 230 Volt 48-440 Hertz power source. The unit, as shipped from the factory, is wired for 115 Volt operation. The input power required when operated from a 115 Volt 60
Hertz power source at full load is 31 Watts and
0.35 Amperes.
2-19 CONNECTIONS FOR 230 VOLT OPERATION
2-20 Normally, the two primary windings of the input transformer are connected in parallel for operation from 115 Volt source.
To convert the power supply to operation from a 230 Volt source, the power transformer windings are connected in series as follows: a .
Unplug the line cord and remove the unit from case.
b. Break the copper between 54 and 55 and also between 50 and 51 on the printed circuit
board. The se are shown in Figure 2-4, and are
labeled on copper side of printed circuit board.
c .
Add strap between 50 and 55.
d. Replace existing fuse with 1 Ampere,
230 Volt fuse.
Return unit to case and operate normally.
2-21 POWER CABLE
2-22 To protect operating personnel, the National
Electrical Manufacturers Association (NEMA) recommends that the instrument panel and cabinet be grounded. This instrument is equipped with a three conductor power cable. The third conductor is the ground conductor and when the cable is plugged into an appropriate receptacle, the instrument is grounded. The offset pin on the power cable three-prong connector is the ground connection.
2-23 To preserve the protection feature when operating the instrument from a two-contact outlet, use a three-prong to two-prong adapter and connect the green lead on the adapter to ground.
2-24 REPACKAGING FOR SHIPMENT
2-25 To insure safe shipment of the instrument, it is recommended that the package designed for the
Figure 2-4.
Primary Connections instrument be used. The original packaging material is reusable. If it is not available, contact your local Hewlett-Packard field office to obtain the materials. This office will also furnish the address of the nearest service office to which the instrument can be shipped. Be sure to attach a tag to the instrument which specifies the owner, model number, full serial number, and service required, or a brief description of the trouble,
2-3
TM 11-6625-2965-14&P
SECTION Ill
OPERATING INSTRUCTIONS
3 - 1 T U R N - O N C H E C K O U T P R O C E D U R E erational capabilities of the supply. A more theoretical description concerning these operational features is contained in Application Note 90 and in various Tech Letters. Copies of these can be obtained from your local Hewlett-Packard field office,
3 - 5 N O R M A L O P E R A T I N G M O D E
3-6 The power supply is normally shipped with its rear terminal strapping connections arranged for Constant Voltage/Current Limiting, local sensing, local programming, single unit mode of operation.
This strapping pattern is illustrated in Figure 3-2.
The operator selects a constant voltage output using the front panel controls (local programming, no strapping changes are necessary).
Figure 3-1.
Front Panel Controls and Indicators
3-2 The front panel controls and indicators are
The normal turn-on sequence, is described below:
A. Push ON/OFF button
①
and observe that button lights,
B. Set range switch
②
to desired operating mode and meter switch to desired voltage range.
C. Adjust coarse and fine voltage controls
③
until desired output voltage is indicated on meter.
D.
and short
E.
Set meter switch to highest current range circuit output terminals.
Observe short circuit output current on meter.
F.
terminals
G.
Remove short and connect load to output
(front or rear),
For Model 6205B, this procedure should be used for both sections of supply.
3 - 3 O P E R A T I N G M O D E S
3-4 The power supply is designed so that its mode of operation can be selected by making strapping connections between particular terminals on the terminal strip at the rear of the power supply.
The terminal designations are stenciled in white on the power supply above their respective terminals. Although the strapping patterns illustrated in this section show the positive terminal grounded, the operator can ground either termina1 or operate the power supply up to 300Vdc off ground (floating). The following paragraphs describe the procedures for utilizing the various op-
Figure 3-2.
Norma 1 Strapping Pattern
3-7 CONSTANT VOLTAGE
3-8 To select a constant voltage output turn on the supply and, with no load connected, adjust the VOLTAGE controls for the desired output voltage. To check the current limit, connect an external ammeter across the output of the supply, turn the VOLTAGE controls fully clockwise, and observe the reading.
The current limit is factory adjusted to approximately 100mA above the current rating of the supply.
If the existing current limit is not compatible with the anticipated load requirements, the limit can be changed as outlined in the following paragraphs.
3-1
TM 11-6625-2965-14&P
3-9 CHANGING CURRENT LIMIT
3-10 The current limit can be varied by adjusting resistor R81, located on the printed wiring board.
This adjustment procedure is described in Paragraph 5-74.
In Models 6204B and 6206B, the current limit may be reduced to a value lower than that attainable by adjusting R81, by adding an ex-
ternal resistor as shown in Figure 3-3. The ap-
proximate value of the external resistance (Rx) can be determined by using the following equation
R
X
= 1 . 7 5
I
E
NOTE
The power supply’s performance will be somewhat degraded if it is operated too close to (within 10OmA) the current limit crossover point.
R x ance for the particular operating mode to be used.
1.75 . the approximate voltage drop across the internal sampling resistance at the current limit crossover point.
A1 A2 A6 A7 A8 A9 -S – GND + +S A10
Figure 3-3.
R
L
Current Limit Alteration
3-11 CONNECTING LOAD
3-12 Each load should be connected to the power supply output terminals using separate pairs of connecting wires.
This will minimize mutual coupling effects between loads and will retain full advantage of the low output impedance of the power supply.
Each pair of connecting wires should be as short as possible and twisted or shielded to reduce noise pickup. (If shield is used, connect one end to power supply ground terminal and leave the other end unconnected. )
3-13 If load considerations require that the output power distribution terminals be remotely located from the power supply, then the power supply output terminals should be connected to the remote distribution terminals via a pair of twisted or shielded wires and each load separately connected to the remote distribution termina1s. For this case,
remote sensing should be used (Paragraph 3-25).
3-14 OPERATION BEYOND NORMAL RATED OUTPUT
3-15 Although the supply can deliver greater than the rated output on both the lower and higher voltage ranges without being damaged, it can not be guaranteed to meet all of its performance specifications.
Generally when operating the supply in this manner, the output is unstable when connected to a load.
When greater than the lower rated voltage is required, the higher voltage range should be used.
This range will deliver half as much output current and all specifications will
apply as listed in Table 1-1. However, if the line
voltage is maintained above its nomina1 value, the supply will probably operate within specifications above its rated output.
3-16 OPTIONAL OPERATING MODES
3-17 REMOTE PROGRAMMING, CONSTANT VOLTAGE
3-18 The constant voltage output of the power supply can be programmed (controlled) from a remote location if required. Either a resistance or voltage source can be used for the programming device.
The wires connecting the programming terminals of the supply to the remote programming device should be twisted or shielded to reduce noise pickup.
The VOLTAGE controls on the front panel are disabled according to the following procedures.
3-19 Resistance Programming (Figure 3-4). In
this mode, the output voltage will vary at a rate determined by the programming coefficient (200 ohms per Volt for Model 6204B and 6205B or 300 ohms per Volt for Model 6206 B). The output voltage will increase by 1 Volt for each 200 ohms (or
300 ohms) added in series with the programming terminals. The programming accuracy is 1% of the programmed voltage.
If greater programming accuracy is required, it may be achieved by changing resistor R13 as outlined in Section V.
3-20 The output voltage of the power supply should be zero Volts ± 20 millivolts when zero ohms is connected across the programming termin a l s .
If a zero ohm voltage closer than this is required, it may be achieved by changing resistor
R6 or R8 as described in Section V.
3-2
A 7 A 6 A 8 A 1 0 + S + G N D - – S
PROGRAMMING
R E S I S T O R
R
L
Figure 3-4.
Remote Resistance Programming
3-21 To maintain the stability and temperature coefficient of the power supply, u se programming resistors that have stable, low noise, and low temperature (less than 30ppm per degree Centigrade) characteristics.
A switch can be used in conjunction with various resistance values in order to obtain discrete output voltages.
The switch should have make-before-break contacts to avoid momentarily opening the programming terminals during the switching interval.
3-22 Voltage Programming (Figure 3-5). Employ the strapping pattern shown on Figure 3-5 for
voltage programming.
In this mode, the output voltage will vary in a 1 to 1 ratio with the programming voltage (reference voltage) and the load on the programming voltage source will not exceed
25 microampere.
TM 11-6625-2965-14&P programming voltage source should be approximately 1000 ohms if the temperature and stability specifications of the power supply are to be maintained.
The programming accuracy is 1% of the programmed voltage.
3-24 Methods of voltage programming with gain are discussed in Application Note 90, Power Supply
Handbook; available at no charge from your local
Sales Office.
3-25 REMOTE SENSING (See Figure 3-6)
3-26 Remote sensing is used to maintain good regulation at the load and reduce the degradation of regulation which would occur due to the voltage drop in the leads between the power supply and the load.
Remote sensing is accomplished by uti-
lizing the strapping pattern shown in Figure 3-6.
The power supply should be turned off before changing strapping patterns. The leads from the
+S terminals to the load will carry less than 10 milliamperes of current, and it is not required that these leads be as heavy as the load leads. H o w ever, they must be twisted or shielded to minimize noise pick-up.
C A U T I O N
Observe polarity when connecting the sensing leads to the load.
A 7 A 6 A 8 A 1 0 + S + A N D – – S
A7 A6 A8 A10 +S + GND - -S
R
L
REFERENCE
VOLTAGE
Figure 3-5.
Remote Voltage Programming
3-23 The impedance (Rx) looking into the external
Figure 3-6.
Remote Sensing
3-27 For reasonable load lead lengths, remote sensing greatly improves the performance of the supply. However, if the load is located a considerable distance from the supply, added precautions must be observed to obtain satisfactory operation.
Notice that the voltage drop in the load leads sub-
3-3
TM 11-6625-2965-14&P tracts directly from the available output voltage and also reduces the amplitude of the feedback error signals that are developed within the unit. Because of these factors it is recommended that the drop in each load lead not exceed 1 Volt. If a larger drop must be tolerated, please consuIt a sales engineer.
NOTE
Due to the voltage drop in the load leads, it may be necessary to readjust the current limit in the remote sensing mode.
3-28 Another factor that must be considered is the inductance of long load leads which could affect the stability of the feedback loop and cause oscillation.
In these cases, it is recommended that the output capacitor (C20) be physically removed from the power supply and placed across the output terminals.
3-29 Although the strapping patterns shown in
Figures 3-4 and 3-5 employ local sensing, notice
that it is possible to operate a power supply simultaneously in the remote sensing and the remote programming modes.
3-30 SERIES OPERATION
3-31 Normal Series Connections (Figure 3-7).
Two or more power supplies can be operated in series to obtain a higher voltage than that available from a single supply. When this configuration is used, the output voltage is the sum of the voltages of the individual supplies. Each of the individual supplies must be adjusted in order to obtain the total output voltage. The power supply contains a protective diode connected internally across the output which protects the supply if one power supply is turned off while its series partner(s) is on.
3-32 Auto-Series Connections (Figure 3-8). The
Auto-Series configuration is used when it is desirable to have the output voltage of each of the series connected supplies vary in accordance with the setting of a control unit. The control unit is called the master; the controlled units are called s l a v e s .
At maximum output voltage, the voltage of the slaves is determined by the setting of the front panel VOLTAGE control on the master. The master supply must be the most positive supply of the series.
The current limit settings of all series
A 7 A 6 A 8 A 1 0 - S + G N D – – S
A 7 A 6 A 8 A 1 0 - S + G N D – – S
Figure 3-7.
Normal Series Connections
3-4
Figure 3-8, Auto-Series, Two and Three Units
units are effective and the current limit for the entire configuration is equal to the lowest current limit setting.
If any of the settings are too low, automatic crossover to current limiting operation will occur and the output voltage will drop. Remote sensing and programming can be used; however, the strapping arrangements shown in the applicable figures show local sensing and programming.
3-33 In order to maintain the temperature coefficient and stability specifications of the power supply, the external resistors (Rx) shown in Figure
3-8 should be stable, low noise, low temperature coefficient (less than 30ppm per degree Centigrade) resistors.
The value of each resistor is dependant on the maximum voltage rating of the master supply, The value of Rx is this voltage divided by the voltage programming current of the slave supply
(l/Kp where Kp is the voltage programming coefficient). The voltage contribution of the slave is
TM 11-6625-2965-14&P determined by its voltage control setting.
3-34 Auto-Parallel.
The strapping patterns for
Auto-Parallel operation of two and three power supplies are shown in Figure 3-9. Auto-Parallel operation permits equal current sharing under all load conditions, and allows complete control of the output current from one master power supply. The output current of each slave will be approximately equal to the master’s regardless of the load conditions.
Because the output current controls of each slave are operative, they should be set to maximum to avoid having the slave revert to constant current operation; this would occur if the master output current setting exceeded the slave’s.
In Model
6205B, it is necessary to make internal connections in order to operate the supply in this mode. The internal connections, specified in Figure 3-9, a r e made to the sampling terminals of the current sampling terminals of the current sampling resistor,
3-5
TM 11-6625-2965-14&P
3-35 AUTO-TRACKING OPERATION (See Figure 3-10)
3-36 The Auto-Tracking configuration is used when it is necessary that several different voltages referred to a common bus, vary in proportion to the setting of a particular instrument (the control or master).
A fraction of the master’s output voltage is fed to the comparison amplifier of the slave supply, thus controlling the slave’s output. The master must have the largest output voltage of any power supply in the group (must be the most positive supply in the example shown on Figure 3-10).
3-37 The output voltage of the slave is a percentage of the master’s output voltage, and is determined by the voltage divider consisting of R X (or
Rx and R
Y
) and supply, R p the voltage control of the slave
, where:
E M R P
E
S
= R x + R p
Turn-on and turn-off of the power supplies is controlled by the master.
Remote sensing and programming can be used; although the strapping patterns for these modes show only local sensing and programming.
In order to maintain the temperature coefficient and stability specifications of the power supply, the external resistors should be stable,
O low noise, low temperature (less than 30ppm per
C) resistors.
3-38 SPECIAL OPERATING CONSIDERATIONS
3-39 PULSE LOADING
3-40 The power supply will automatically cross over from constant voltage to constant current operation in response to an increase (over the preset limit) in the output current, Although the preset limit may be set higher than the average output current high peak currents (as occur in pulse loading) may exceed the preset current limit and cause crossover to occur.
If this crossover limiting is not desired, set the preset limit for the peak requirement and not the average.
3-41 OUTPUT CAPACITANCE
3-42 An internal capacitor, acress the output terminals of the power supply, helps to supply highcurrent pulses of short duration during constant voltage operation.
Any capacitance added externally will improve the pulse current capability, but will decrease the safety provided by the current limiting circuit.
A high-current pulse may damage load components before the average output current is large enough to cause the current limiting circuit to operate.
3-43 REVERSE VOLTAGE LOADING
3-44 A diode is connected across the output terminals.
Under normal operating conditions, the diode is reverse biased (anode connected to negative terminal).
If a reverse voltage is applied to the output terminals (positive voltage applied to negative terminal), the diode will conduct, shunting current across the output terminals and limiting the voltage to the forward voltage drop of the diode.
This diode protects the series transistors and the output electrolytic capacitors.
3-45 REVERSE CURRENT LOADING
3-46 Active loads connected to the power supply may actually deliver a reverse current to the power supply during a portion of its operating cycle. An external source cannot be allowed to pump current into the supply without loss of regulation and possible damage to the output capacitor.
To avoid these effects, it is necessary to preload the supply with a dummy load resistor so that the power supply delivers current through the entire operating cycle of the load device.
3 - 6
T
M
1 I-6625-2965-14&P
SECTION IV
PRINCIPLES OF OPERATION
REFERENCE
REGULATOR
CIRCUIT t
AC
I N P u T
POWER
TRANSFORMER
B I A S
SUPPLY
B
I
A
S v VOLTAGES
CURRENT
LIMITING
C I R C U I T
4
*
P/o
~o
I
Pm
RANGE
S W I T C H
( s 2 )
NOTE
— D E N O T E S V O L T A G E
FEEOBACK PATH
— D E N O T E S C U R R E N T
L I M I T P A T H
R E C T I F I E R
AND
F I L T E R
S E R I E S
REGULATOR
A
D R I V E R
AMPL
+
2
CURRENT s A M P L I N G
R E S I S T O R S
CONSTANT
VOLTAGE
I N P U T
C I R C U I T
4
4
4
C I R C U I T
4
4
1,
Q
Figure 4-1.
Overall Block Diagram
4-1 OVERALL DESCRIPTION
4-2
Figure 4-1 shows one section of the Model
6205B dual power supply. The supply consistsof two dual range sections; each identical to the other. Each section consists ofa rectifier and filter, a series regulator, an error amplifier and driver, a constant voltage input circuit, a cument limiting circuit, a reference regulator circuit, a bias supply, and a metering circuit. Since both sections of the supply are identical, only one section is described below.
4-3 The ac line voltage is first applied to the power transformer, The tap for the appropriate voltage range is selected by S2. The input is then rectified and filtered. This raw dc is then fed to the series regulator which alters its conduction to obtain the proper regulated dc output voltage.
4-4 Any changes in output voltage are felt by constant voltage comparator which compares a the portion of the output with a fixed reference volts ge.
If a difference exists, the comparator circuit sends a n error signal to the series regulator via the error amplifier and driver stages. This error signal changes the conduction of the series regulator so that a constant output voltage is maintained.
4-5 Changes in output current are reflected in the voltage drop across the current sampling resistor network. If this voltage drop exceeds a preset limit, the current limit transistor conducts, sending a turn-down signal to the series regulator via the driver. This signal changes the conduction of the
4-1
TM 11-6625-2965-14&P series regulator so that the output current is limited to the proper value.
4-6 The reference circuit provides stable reference voltages used in the constant voltage comparator and current limit circuits. The bias circuit provides the less critical bias voltages used in the supply.
4-7 The meter circuit provides a continuous indication of output voltage or current in both ranges.
4-8 DETAILED CIRCUIT ANALYSIS
4-9 FEEDBACK LOOP
4-10 The feedback loop functions continuously to keep the output voltage constant during normal operation of the supply. For purposes of this discussion, assume that the output voltage instantaneously rises (goes positive) due to a variation in the external load circuit. Note that the change may be in the form of a slow rise in the output voltage or a positive going ac signal. An ac signal is coupled to summing point A6 through capacitor Cl and a dc voltage is coupled to A6 through R 10.
4-11 The rise in output voltage causes the voltage at A6 and thus the base of Q1A to decrease (go negative). Q1A now decreases its conduction and its collector voltage rises. The positive going error voltage is amplified and inverted by Q3 and fed to the base of the series transistor(s) via emitter follower Q4. The negative going input causes the series transistor(s) to decrease its conduction so that it drops more of the line voltage, reducing the output voltage to its original level.
4-12 If the external load resistance decreases to a certain crossover point, the supply will operate in the current limiting mode. In the current limit mode, Q1O conducts sending a negative going, turn-down signal to the series regulator via driver
Q4 .
4-13 SERIES REGULATOR
4-14 The series regulator consists of transistor stage Q7 (and Q6 on Model 6206 B). The regulator serves as a series control element by altering its conduction so that the output voltage is kept constant and the current limit is never exceeded, The conduction of the transistor(s) is controlled by the feedback voltage obtained from driver Q4. Diode
CR11, connected across the regulator circuit, protects the series transistor(s) against reverse voltages that could develop across it during parallel or auto-parallel operation if one supply is turned on before the other.
4-15 CONSTANT VOLTAGE COMPARATOR
4-16 The circuit consists of the coarse and fine programming resistors (Rl0A and R 10 B), and a differential amplifier stage (Ql and associated components).
Transistor Q1 consists of two transistors housed in a single package. The transistors have matched characteristics minimizing differential voltages due to mismatched stages.
Moreover, drift due to thermal differentials is minimized, since both transistors operate at essentially the same temperature.
4-17 The constant voltage comparator continuously compares a fixed reference voltage with a portion of the output voltage and, if a difference exists, produces an error voltage whose amplitude and phase is proportional to the difference.
The error output is fed back to the series regulator, through the (mixer) error and driver amplifiers. The error voltage changes the conduction of the series regulator which, in turn, alters the output voltage so that the difference between the two input voltages applied to the differential amplifier is reduced to zero.
The above action maintains the output voltage constant.
4-18 Stage Q1B of the differential amplifier is connected to a common (+S) potential through impedance equalizing resistor R5. Resistors R6 and
R8 are used to zero bias the input stage, offsetting minor base-to-emitter voltage differences in
Q1. The base of Q1A is connected to a summing point at the junction of the programming resistors and the current pullout resistors, R12 and R13.
Instantaneous changes in output voltage result in an increase or decrease in the summing point potential. Q1A is made to conduct more or less, in accordance with summing point voltage change.
The resultant output error voltage is fed back to the series regulator via the remaining components of the feedback loop.
Resistor Rl, in series with the base Q1A, limits the current through the programming resistors during rapid voltage turn-down.
Diodes CR1 and CR2 form a limiting network which prevent excessive voltage excursions from over driving stage Q1A.
Capacitor Cl, shunting the programming resistors, increases the high frequency gain of the input amplifier. Resistor R1 3, shunting pullout resistor R12, is factory selected so that all of the + 6.2 Volt reference is dropped across
R12 and R13. Linear constant voltage programming is assured with a constant current flowing through
R1O. C20 stabilizes the feedback loop and may be removed to avoid current surges and increase the programming speed.
4-19 ERROR AMPLIFIER AND DRIVER
4-20 The error and driver amplifiers amplify the error signal from the constant voltage comparator circuit to a leve1 sufficient to drive the series regulator transistor(s).
Driver Q4 also receives a current limiting input if Q10, the current limiting transistor, conducts.
4-2
4-21 Stage Q3 contains a feedback equalizer network, C5 and R30, which provides for high frequency roll off in the loop gain in order to stabilize the feedback loop. Q17 establishes a stable emitter bias potential for error amplifier Q3. Emitter follower transistor(s) Q4 (and Q5) serves as the driver (and predriver) element for the series regulator.
4-22 CURRENT LIMIT CIRCUIT
4-23 The current limit circuit limits the output current to a preset value determined by the setting of R81. Switch S2B selects the proper sampling resistance to maintain an equal voltage drop acress the current sampling network in both ranges.
4-24 When S2 is set to the 20 Volt position, R54 and R55 are connected in parallel. When S2 is set to the 40 Volt position, the current sampling network consists solely of R54. Note that in the twenty Volt range, twice as much current can be delivered as in the forty Volt range. Since the twenty Volt range has a sampling resistance equal to half the value of that for the forty Volt range, an equal sampling resistor voltage drop is obtained in both ranges. This also applies to S2 in the 6206B.
4-25 R81 sets the bias of Q10, and thus, the threshold point at which Q10 conducts and current limiting begins. If this threshold is exceeded, Q10 begins to conduct, forward biasing CR16 and sending a turn-down signal to the series regulater via the driver. If the current through the current sampling network decreases below the threshold point,
Q10 turns off and no longer affects the operation of the supply.
4-26 REFERENCE CIRCUIT
4-27 The reference circuit (see schematic) is a feedback power supply similar to the main supply.
It provides stable reference voltages which are used throughout the unit. The reference voltages are a 11 derived from smoothed dc obtained from the full wave rectifier (CR22 and CR23) and filter capacitor C10. The +6.2 and -6.2 voltages, which are used in the constant voltage input circuit for comparison purposes, are developed across temperature compensated Zener diodes VR1 and VR2. Resistor
R43 limits the current through the Zener diodes to establish an optimum bias level.
TM 11-6625-2965-14&P
4-28 The reference circuit consists of series regulating transistor Q9 and error amplifier Q8. Output voltage changes are detected by Q8 whose base is connected to the junction of a voltage divider
(R41, R42) connected directly across the supply.
Any error signals are amplified and inverted by Q8 and applied to the base of series transistor Q9.
The series element then alters its conduction in the direction, and by the amount, necessary to maintain the voltage across VR1 and VR2 constant. Resistor R46, the emitter resistor for Q8, is connected in a manner which minimizes changes in the reference voltage caused by variations in the input line.
Output capacitor C9 stabilizes the regulator loop.
4-29 METER CIRCUIT (Figure 4-2)
4-30 The meter circuit provides continuous indications of output voltage or current on a single multiple range meter.
The meter can be used either as a voltmeter or an ammeter depending upon the position of the METER section of switch S2 on the front panel of the supply. This switch also selects one of two meter ranges on each scale. The meter circuit consists of METER-RANGE switch S2, various multiplying resistors and the meter movement.
4-31 When measuring voltage, the meter is placed directly across the output of the supply between the +S and -S terminals. With the METER section of S2A in the higher voltage position (terminals A2 and A10) multiplying resistors R60, R61, R72, and the parallel combination of R73 and R87, are in series with the meter. For low output voltages, the
METER switch S2A can be set to the first position
(terminals 1 and 9) which removes R61 from its series position allowing a larger percentage of the output voltage to be felt acress the meter.
4-32 When measuring current; the meter circuit is connected across the current sampling resistor
network as shown on Figure 4-2 and indicates the
output current that flows through the network. The
RANGE section S2B connects the appropriate resistance in series with the meter so that its maximum deflection range is full-scale in the high current (low voltage) operating mode and half-scale in the low current (high voltage) operating mode. This circuit obviates the need for a dual current scale which would be necessary since the voltages dropped across the current sampling network in both operating modes are equal for proportional currents.
4-3
TM 11-6625-2965-14&P
Figure 4-2.
Multiple Range Meter Circuit, Simplified Schematic
4-4
TM 11-6625-2965-14&P
SECTION V
MAINTENANCE
5-1 INTRODUCTION
5-2 Upon receipt of the power supply, the per-
formance check (Paragraph 5-10) should be made.
This check is suitable for incoming inspection. If a fault is detected in the power supply while making the performance check or during normal operation, proceed to the troubleshooting procedures
(Paragraph 5-48). After troubleshooting and repair
(Paragraph 5-58), perform any necessary adjust-
ments and calibrations (Paragraph 5-60). Before
returning the power supply to normal operation, repeat the performance check to ensure that the fault has been properly corrected and that no other faults exist. Before doing any maintenance checks, turn-on power supply, allow a ha if-hour warm-up, and read the general information regarding measurement techniques (Paragraph 5-3).
5-3 GENERAL MEASUREMENT TECHNIQUES
Figure 5-1.
Front Pane1 Terminal Connections
5-4 The measuring device must be connected across the sensing leads of the supply or as close to the output terminals as possible when measuring the output impedance, transient response, regulation, or ripple of the power supply in order to achieve valid measurements. A measurement made acress the load includes the impedance of the leads to the load and such lead lengths can easily have an impedance several orders of magnitude greater than the supply impedance, thus invalidating the measurement.
5-5 The monitoring device should be connected
to the +S and -S terminals (see Figure 3-2) or as
shown in Figure 5-1. The performance characteris-
tics should never be measured on the front terminals if the load is connected across the rear terminals. Note that when measurements are made at the front terminals, the monitoring leads are con-
nected at A, not B, as shown in Figure 5-1. Fail-
ure to connect the measuring device at A will result in a measurement that includes the resistance of the leads between the output terminals and the point of connection.
Figure 5-2. Output Current Measurement Technique
5-6 For output current measurements, the current sampling resistor should be a four-terminal resistor. The four terminals are connected as shown in
Figure 5-2. In addition, the resistor should be of the low noise, low temperature coefficient (less than 30ppm/°C) type and should be used at no more than 5% of its rated power so that its temperature rise will be minimized.
5-7 When using an oscilloscope, ground one terminal of the power supply and then ground the case of the oscilloscope to this same point. Make certain that the case is not also grounded by some other means (power line). Connect both oscilloscope input leads to the power supply ground terminal and check that the oscilloscope is not exhibiting a ripple or transient due to ground loops, pick-up, or other means.
5-1
TM 11-6625-2965-14&P
5-8 TEST EQUIPMENT REQUIRED
5-9 Table 5-1 lists the test equipment required
to perform the various procedures described in this
Section.
NOTE
A satisfactory substitute for a differential voltmeter is to arrange a reference voltage source and null detector
as shown in Figure 5-3. The refer-
ence voltage source is adjusted so that the voltage difference between the supply being measured and the reference voltage will have the required resolution for the measurement being made. The voltage difference will be a function of the null detector that is used. Examples of satisfactory null detectors are: 419A null detector, a dc coupled oscilloscope utilizing differential input, or a 50mV meter movement with a 100 division scale. For the latter, a 2mV change in voltage will result in a meter deflection of four divisions.
Figure 5-3.
Differential Voltmeter Substitute,
Test Setup
CAUTION
Care must be exercised when using an electronic null detector in which one input terminal is grounded to avoid ground loops and circulating currents.
Table 5-1.
Test Equipment Required
TYPE
REQUIRED
CHARACTERISTICS
USE
Differential
Voltmeter
Variable
Voltage
Sensitivity: lmV full scale
(min.). Input impedance:
10 megohms (min.).
Range: 90-130 Volts
Equipped with voltmeter accurate within 1 Volt.
AC Voltmeter Accuracy: 2%. Sensitivity: lmV full scale deflection
(min.).
Oscilloscope Sensitivity: 10µV/cm. Differential input.
Oscillator Range: 5Hz to 600kHz
Accuracy: 2%
DC Voltmeter Accuracy: 1%. Input resistance: 20,000 ohms/Volt (min.).
Repetitive
Load Switch
Rate: 60-400 Hz, 2µsec rise and fall time.
Measure dc voltages; calibration procedures
Vary ac input
Measure ac voltage and ripple
Display transient response waveforms
Impedance Checks
Measure dc voltages
Measure transient response
RECOMMENDED
MODEL
3420 (See Note)
403 B
140 A plus
1402A plug in.
200 CD
4 1 2 A
5-2
TYPE
Resistor
Resistor
Resistor
Resister
Resistor
Resistor
Capacitor
Decade
Resistance
Box
TM 11-6625-2965-14&P
Table 5-1.
Test Equipment Required (Continued)
REQUIRED
CHARACTERISTICS
USE
R E C O M M E N D E D
MODEL
6204B, 6205B; 133 , ± 10% 15W Load Resistor, HIGH range
6206B; 120 , ±1O% 15W
Value: 5 , 0.5%, 4.5 Watts, Current sampling
20ppm, 4-Terminal.
Value: 6204B and 6205B, 28 ,
2W (min.).
6206B, 27 , 10W (min.).
Load resistor, low range
1Κ ± 1 % , 2 W a t t n o n - i n d u c Measure impedance tive
Measure impedance
Calibrate programming current
100 ohms, ±5%, 10 Watt
± 0.1%, 5 Watt
500µf, 50WVdc
Range: 0-150K (min.).
Accuracy: 0.1% plus 1 ohm
Make-before-break contacts.
Measure impedance
Measure programming coefficients
- - - -
R54 or R55,
- - - -
- - - -
- - - -
- - - -
- - - -
- - - -
5-10 PERFORMANCE TEST
5-11 The following test can be used as an incoming inspection check and appropriate portions of the test can be repeated either to check the operation of the instrument after repairs or for periodic maintenance tests. The tests are performed using a 115Vac 60 Hz, single phase input power source.
If the correct result is not obtained for a particular check, do not adjust any controls; proceed to
troubleshooting (Paragraph 5-48).
NOTE
For Model 6205B supplies, the following performance checks should be performed twice in order to check both independent sections of the supply.
5-12 CONSTANT VOLTAGE TESTS
5-13 For Constant Voltage measurements, the measuring device must be connected acress the rear sensing terminals of the supply in order to achieve valid indications. A measurement made acress the load includes the impedance of the leads to the load and such lead lengths can easily have an impedance several orders of magnitude greater than the supply impedance (1 milliohm at dc), thus invalidating the measurement.
5-14 To avoid mutual coupling effects, each monitoring device must be-connected directly to the sensing terminals by separate pairs of leads.
The load resistor is connected acress the output terminals and must be selected according to the output voltage and current of the supply. When measuring the constant voltage performance specifications, the CURRENT controls should be set well above the maximum output current which the supply will draw, since the onset of constant current action will cause a drop in output voltage, increased ripple, and other performance changes not properly ascribed to the constant voltage operation of the supply.
5-15 Voltage Output and Voltmeter Accuracy. To check the output voltage, proceed as follows: a. Connect 133 ohm load resistor (120 ohms for Model 6206B) across rear output terminals of supply.
b. Connect differential voltmeter acress +S and -S terminals of supply observing correct polarity.
5-3
TM 11-6625-2965-14&P c.
Set METER switch to highest voltage range and RANGE switch to highest voltage mode and turn on supply.
d. Adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated output voltage.
e.
Differential voltmeter should indicate maximum rated output voltage within 3%.
5-16 Output Current and Ammeter Accuracy. To check the output current, proceed as follows: a.
Connect test setup shown in Figure 5-4.
b.
Set METER switch to lowest current range and RANGE switch to high voltage mode.
c.
Turn on supply and adjust VOLTAGE controls until front panel meter indicates exactly 300 mA (0.5 Ampere for Model 6206B supplies).
d. Differential voltmeter should read 1.5 ±
0.045Vdc.
ferential voltmeter.
e .
Disconnect load resistors.
f.
Reading on differential voltmeter should not vary from reading recorded in Step d by more than 8mVdc for Models 6204B and 6205B or 10mVdc for Model 6206B supply.
Figure 5-5.
Load Regulation, Test Setup
Figure 5-4.
Output Current, Test Setup
5-17 Load Regulation.
Definition: The change
∆Ε in the static value of dc output voltage resulting from a change in load resistance from open circuit to a value which yields maximum rated output current (or vice versa).
5-18 tion,
To check the constant voltage load regulaproceed as follows: a .
Connect test setup as shown in Figure
5-5.
b. Turn CURRENT controls fully clockwise.
c.
Turn-on supply and adjust VOLTAGE controls until front panel voltmeter indicates exactly the maximum rated output voltage.
d. Read and record voltage indicated on dif-
5-19 Line Regulation.
Definition: The change,
∆Ε in the static value of dc output voltage resulting from a change in ac input voltage over the specified range from low line 10% less than nominal to high line 10% more than nominal or from high line to low line.
5-20 To test the constant voltage line regulation, proceed as follows: a.
Connect variable auto transformer between input power source and power supply power input.
b. Turn CURRENT controls fuIly clockwise.
c.
Connect test setup shown in Figure 5-5.
d. Adjust variable auto transformer for low line (104Vac).
e.
Set METER switch to highest current range and turn on supply.
f.
Adjust VOLTAGE controls until front panel voltmeter indicates exactly the maximum rated output voltage.
9.
Read and record voltage indicated on differential voltmeter.
h. Adjust variable auto transformer for high line (126Vac).
5-4
I
TM 11-6625-2965-14&P i.
Reading on differential voltmeter should not vary from reading recorded in Step g by m o r e than 8mVdc for Models 6204B and 6205B or 10mVdc for Model 6206B.
5-21 Ripple and Noise.
Definition: The residual ac voltage which is superimposed on the dc output of a regulated power supply.
Ripple and noise may be specified and measured in terms of its RMS or (preferably) peak-to-peak value.
Ripple and noise measurement can be made at any input ac line voltage combined with any dc output voltage and load current within rating.
5-22 The amount of ripple and noise that is present on the power supply output is measured either in terms of the RMS or (preferably) peak-to-peak value.
The peak-to-peak measurement is particularly important for applications where noise spikes could be detrimental to a sensitive load, such as logic circuitry.
The RMS measurement is not an ideal representation of the noise, since fairly high output noise spikes of short duration could be present in the ripple and not appreciably increase the RMS value.
5-23 The technique used to measure high frequency noise or “ spikes” on the output of a power supply is more critical than the low frequency ripple and noise measurement technique; therefore the
former is discussed separately in Paragraph 5-31,
5-24 Ripple and Noise Measurements. Figure
5-6A shows an incorrect method of measuring p-p
ripple. Note that a continuous ground loop exists from the third wire of the input power cord of the supply to the third wire of the input power cord of the oscilloscope via the grounded power supply case, the wire between the negative output terminal of the power supply and the vertical input of the scope, and the grounded scope case. Any ground current circulating in this loop as a result of the difference in potential E
G between the two ground points causes an IR drop which is in series with the scope input. This IR drop, normally having a 60
HZ line frequency fundamental, plus any pickup on the unshielded leads interconnecting the power supply and scope, appears on the face of the CRT. The magnitude of this resulting noise signal can easily be much greater than the true ripple developed between the plus and minus output terminals of the power supply, and can completely invalidate the measurement.
5-25 The same ground current and pickup problems
Figure 5-6.
CV Ripple and Noise, Test Setup can exist if an RMS voltmeter is substituted in
place of the oscilloscope in Figure 5-6. However,
the oscilloscope display, unlike the true RMS meter reading, tells the observer immediately whether the fundamental period of the signal displayed is 8.3 milliseconds (1/120 Hz) or 16.7 milliseconds (1/60Hz). Since the fundamental ripple frequency present on the output of an supply is
120Hz (due to full-wave rectification), an oscilloscope display showing a 120Hz fundamental component is indicative of a “clean” measurement setup, while the presence of a 60
HZ fundamental usually means that an improved setup will result in a more accurate (and lower) value of measured ripple.
5-26 Although the method shown in Figure 5-6A is
not recommended for ripple measurements, it may prove satisfactory in some instances provided certain precautionary measures are taken. One method of minimizing the effects of ground current flow
(IG) is to ensure that both the supply and the test instrument are plugged into the same ac power buss.
5-5
TM 11-6625-2965-14&P
5-27 To minimize pick up, a twisted pair or (preferably) a shielded two-wire cable should be used to connect the output terminals of the power supply to the vertical input terminals of the scope. When using a twisted pair, care must be taken that one of the two wires is connected both to the grounded terminal of the power supply and the grounded input terminal of the oscilloscope. When using shielded two-wire cable, it is essential for the shield to be connected to ground at one end only to prevent any ground current flowing through this shield from inducing a signal in the shielded leads.
5-28 To verify that the oscilloscope is not displaying ripple that is induced in the leads or picked up from the grounds, the (+) scope lead should be shorted to the (-) scope lead at the power supply terminals.
The ripple value obtained when the leads are shorted should be subtracted from the actual ripple measurement.
5-29 If the foregoing measures are used, the
single-ended scope of Figure 5-6A may be adequate
to eliminate non-real components of ripple so that a satisfactory measurement can be obtained.
However, in stubborn cases or in measurement situations where it is essential that both the power supply case and the oscilloscope case be connected to ground (e. g. if both are rack-mounted), it may be necessary to use a differential scope with float-
ing input as shown in Figure 5-6B. If desired, two
single-conductor shielded cables may be substituted in place of the shielded two-wire cable with equal success.
Because of its common mode rejection, a differential oscilloscope displays only the difference in signal between its two vertical input terminals, thus ignoring the effects of any common mode signal introduced because of the difference in the ac potential between the power supply case and scope case. Before using a differential input scope in this manner, however, it is imperative that the common mode rejection capability of the scope be verified by shorting together its two input leads at the power supply and observing the trace on the CRT.
If this trace is a straight line, the scope is properly ignoring any common mode signal present.
If this trace is not a straight line, then the scope is not rejecting the ground signal and must be realigned in accordance with the manufacturer’s instructions until proper common mode rejection is attained.
5-30 To check the ripple and noise output, proceed as follows: a.
Connect the oscilloscope or RMS volt-
meter as shown in Figures 5-6A
or 5-6B.
b. Adjust VOLTAGE control until front pane 1 meter indicates maximum rated output voltage.
c .
The observed ripple and noise should be less than 200µVrms and lmV p-p.
5-31 Noise Spike Measurement. When a high frequency spike measurement is being made, an instrument of sufficient bandwidth must be used; an oscilloscope with a bandwidth of 20 MHz or more is adequate. Measuring noise with an instrument that has insufficient bandwidth may conceal high frequency spikes detrimental to the load.
5-32 The test setup illustrated in Figure 5-6A is
generally not acceptable for measuring spikes; a differential oscilloscope is necessary. Further-
more, the measurement concept of Figure 5-6B
is must be modified if accurate spike measurement to be achieved:
1. As shown in Figure 5-7, two coax cables, must be substituted for the shielded twowire cable.
2. Impedance matching resistors must be included to eliminate standing waves and cable ringing, and the capacitors must be connected to block the dc current path.
3. The length of the test leads outside the coax is critical and must be kept as short as possible; the blocking capacitor and the impedance matching resistor should be connected directly from the inner conductor of the cable to the power supply terminals.
4.
Notice that the shields of the power supply end of the two coax cables are not connected to the power supply ground, since such a connection would give rise to a ground current path through the coax shield, resulting in an erroneous measurement.
5.
Since the impedance matching resistors constitute a 2-to-1 attenuator, — the noise spikes observed on the oscilloscope should be less than
0.5mV p-p instead of lmV.
5-33 The circuit of Figure 5-7 can also be used for the normal measurement of low frequency ripple and noise; simply remove the four terminating re-
Figure 5-7, CV Noise Spike, Test Setup
5 - 6
sisters and the blocking capacitors and substitute a higher gain vertical plug-in in place of the wideband plug-in required for spike measurements.
Notice that with these changes, Figure 5-7 be-
comes a two-cable version of Figure 5-6C.
5-34 Transient Recovery Time.
Definition: The time “X” for output voltage recovery to within “Y” millivolts of the nominal output voltage following a “Z” Amp step change in load current - where:
“Y” is specified as 10 millivolts.
The nominal output voltage is defined as the dc level half way between the static output voltage before and after the imposed load change, and “Z” is the specified load current change, which is 5
Amperes.
5-35 A mercury-wetted relay, as connected in the load switching circuit of Figure 5-8 should be used for loading and unloading the supply. When this load switch is connected to a 60Hz ac input, the mercury-wetted relay will open and close 60 times per second. Adjustment of the 25K control permits adjustment of the duty cycle of the load current switching and reduction in jitter of the oscilloscope display.
5-36 The maximum load ratings listed in Figure
5-4 must be observed in order to preserve the mer-
TM 11-6625-2965-14&P cury-wetted relay contacts. Switching of larger load currents can be accomplished with mercury pool relays; with this technique fast rise times can still be obtained, but the large inertia of mercury pool relays limits the maximum repetition rate of load switching and makes the clear display of the transient recovery characteristic on an oscilloscope more difficult.
5-37 To check the transient recovery time of the supply, proceed as follows: a .
Connect test setup shown in Figure 5-8.
b. Set METER switch to highest current range and RANGE switch to lowest voltage mode.
c, Turn on supply and adjust VOLTAGE controls until front panel meter indicates exactly the maximum rated output current.
d. Close line on repetitive load switch setup.
e . Adjust 25 potentiometer until a stable display is obtained on oscilloscope. Waveform
should be within the tolerances shown on Figure
5-9 (output should return to within 10mV of original
value in less than 50 microseconds).
Figure 5-8.
Transient Recovery Time, Test Setup
Figure 5-9. Transient Recovery Time, Waveforms
5-38 OUTPUT IMPEDANCE
5-39 To check the output impedance, proceed as follows: a .
Connect test setup shown in Figure 5-10.
b. Set METER switch to highest voltage range.
c .
Turn on supply and adjust VOLTAGE controls until front panel meter reads 20 Volts.
d. Set AMPLITUDE control on oscillator to
10 Volts (E in
), and FREQUENCY control to 100 Hz.
e .
Record voltage across output terminals of the power supply (E o meter.
) as indicated on ac voltf. Calculate the output impedance by the
5-7
TM 11-6625-2965-14&P following formula: g.
The output impedance (Z less than 0,020 ohms.
out
) should be h. Using formula of Step f, calculate output impedance at frequencies of 50kHz and 500kHz.
Values should be less than 0.5 ohm and 3.0 ohms, respectively.
Figure 5-10.
Output Impedence, Test Setup
5-40 Temperature Coefficient.
Definition: The change in output voltage per degree Centigrade change in the ambient temperature under conditions of constant input ac line voltage, output voltage setting, and load resistance.
5-41 The temperature coefficient of a power supply is measured by placing the power supply in an oven and varying it over any temperature span within its rating.
(Most power supplies are rated for operation from 0°C to 55°C. ) The power supply must be allowed to thermally stabilize for a sufficient period of time at each temperature of measurement.
5-42 The temperature coefficient specified is the maximum temperature-dependent output voltage change which will result over any 5°C interval.
The differential voltmeter or digital voltmeter used to measure the output voltage change of the supply should be placed outside the oven and should have a long term stability adequate to insure that its drift will not affect the overall measurement accuracy.
5-43 To check the temperature coefficient, proceed as follows: a .
Connect test setup shown in Figure 5-5.
b. Turn CURRENT controls fully clockwise and adjust front panel VOLTAGE controls until the front panel voltmeter indicates 10Vdc.
c.
Insert the power supply into the temperature-controlled oven (differential voltmeter and load resistance remain outside oven). Set the temperature to 30°C and aIlow 30 minutes warmup.
d. Record the differential voltmeter indication.
e .
Raise the temperature to 40°C and allow
30 minutes warm-up.
f.
The differential voltmeter indication should change by less than 90mV from indication recorded in Step d.
5-44 Output Stability.
Definition: The change in output voltage for the first eight hours following a 30 minute warm-up period. During the interval of measurement all parameters, such as load resistance, ambient temperature, and input line voltage are held constant.
5-45 This measurement is made by monitoring the output of the power supply on a differential voltmeter or digital voltmeter over the stated measurement interval; a strip chart recorder can be used to provide a permanent record. A thermometer should be placed near the supply to verify that the ambient temperature remains constant during the period of measurement. The supply should be put in a location immune from stray air currents (open doors or windows, air conditioning vents); if possible, the supply should be placed in an oven which is held at a constant temperature. Care must be taken that the measuring instrument has a stability over the eight hour interval which is at least an order of magnitude better than the stability specification of the power supply being measured. Typically, a supply may drift less over the eight hour measurement interval than during the ½ hour warm-up period.
5-46 Stability measurement can be made while the supply is remotely programmed with a fixed wire-wound resistor, thus avoiding accidental changes in the front panel setting due to mechanical vibration or “knob-twiddling. “
5-8
5-47 To check the output stability, proceed as follows: a.
Connect test setup shown in Figure 5-5.
b. Turn CURRENT controls fully clockwise and adjust VOLTAGE controls for 40Vdc output.
c .
Allow 30 minutes warm-up then record the differential voltmeter indication.
d. Mter 8 hours, differential voltmeter should change by less than 45mV from indication recorded in Step c.
5-48 TROUBLESHOOTING
5-49 Before attempting to troubleshoot this instrument, ensure that the fault is with the instrument and not with an associated circuit. The per-
formance test (Paragraph 5-10) enables this to be
determined without having to remove the instrument from the cabinet.
5-50 A gcod understanding of the principles of operation is a helpful aid in troubleshooting, and
it is recommended that the reader review Section
IV of the manua~ before attempting to troubleshoot
the unit in detail. Once the principles of operation are understood, refer to the overall trouble-
shooting procedures in Paragraph 5-53 to locate
the symptom and probable cause.
5-51 The schematic diagram at the rear of the manual (Figure 7-1) contains normal voltage read-
TM 11-6625-2965-14&P ings taken at various points within the circuits.
These voltages are positioned adjacent to the applicable test points (identified by encircled numbers). Component and test point designations are marked directly on the main printed wiring board.
5-52 If a defective component is located, replace it and re-conduct the performance test. When a component is replaced, refer to the repair and replacements and adjustment and calibration paragraphs in this section.
5-53 OVERALL TROUBLESHOOTING PROCEDURE
5-54 To locate the cause of trouble follow Steps
1, 2, and 3 in sequence.
(1) Check for obvious troubles such as open fuse, defective power cord, input power failure, or defective voltage or current meter. Next remove the top cover (held by four retaining screws) and inspect for open connections, charred components, etc.
If the trouble source cannot be detected by visual inspection, proceed with
Step 2.
(2) In almost all cases, the trouble can be caused by improper dc bias or reference voltages; thus, it is a good practice to check voltages in
Table 5-2, before proceeding with Step 3.
(3) Disconnect the load and examine Table
5-3 to determine your symptom and probable cause.
STEP
1
2
3
4
METER
COMMON
+s
31
+s
38
METER
POSITIVE
33
+s
37
41
Table 5-2.
Reference Circuit Troubleshooting
NORMAL
INDICATION
6.2 * 0.3Vdc
6.2 + 0.3Vdc
12.4 *1. OVdc
7.5 * .7Vdc
NORMAL
RIPPLE
(P-P)
IF INDICATION ABNORMAL, TAKE THIS ACTION
. 3mV Check 12.4 Volt bias or VR1 (See next paragraph)
. 4mV Check 12.4 Volt bias or VR2 (See next paragraph)
2.8KV
Check Q8, Q9, CR22, CR23, C1O, T1 lV Check C12, CR8, CR24, CR25 v
SYMPTOM
High output voltage
Low output voltage
Table 5-3.
Overall Trouble shooting
CHECKS AND PROBABLE CAUSES a.
Front panel meter defective.
b. Series regulator feedback loop defective. Refer to Table 5-4.
a .
Fuses blown (Check CR26-CR29 or C14 for short).
5-9
TM 11-6625-2965-14&P
Table 5-3.
Overall Troubleshooting (Continued)
SYMPTOM CHECKS AND PROBABLE CAUSES
Will not current limit
High ripple
Poor line regulation
Poor load regulation
(constant voltage) b. Front panel meter defective.
c .
Series regulator feedback loop defective. Refer to Table 5-5.
a. Q10 open. R81 defective.
a.
Check operating setup for ground loops.
b. If output floating, connect lµf capacitor between output and ground.
c.
Ensure that supply is not crossing over to current limit mode under loaded conditions.
a.
Check reference circuit (Paragraph 5-55).
b. Check reference circuit adjustment (Paragraph 5-69).
a.
Measurement technique. (Paragraph 5-17)
b. Check reference circuit (Paragraph 5-55) and adjustment (Para-
graph 5-69).
c.
Ensure that supply is not going into current limit.
a.
Check C5 for open, adjustment of R30 (Paragraph 5-72).
Oscillates (constant voltage)
Poor stability
(constant voltage) a.
Check ± 6.2Vdc reference voltages (Paragraph 5-55).
b. Noisy programming resistor R10.
c .
CR1, CR2 leaky.
d. Check Rl, R12, R13, for noise or drift.
e.
Stage Q1 defective.
5-55 To check the zener diodes in the reference circuit, proceed as follows: a .
Connect differential voltmeter across zener diode.
b. Connect appropriate load resistor, given
in Figure 5-4, across (+) and (-) output terminals.
c .
Turn VOLTAGE control fully clockwise.
d. Set METER switch to highest current range and turn on supply.
e .
Adjust CURRENT controls until panel meter reads exactly the maximum rated output current.
f.
Read and record voltage indicated on differential voltmeter.
g.
Short out load resistor by closing S1.
h. If reading on differential voltmeter differs by more than 1.07mV for 6204B and 6205B or
.946mV for 6206B from the reading in Step f, replace zener diode.
5-5b Series Regulating Feedback Loop. When troubleshooting the series regulating loop, it is useful to open the loop since measurements made anywhere within a closed loop may appear abnormal. With a loop closed, it is very difficult to separate cause from effect. As described in
Tables 5-4 and 5-5, the conduction or cutoff ca-
pability of each stage is checked by shorting or opening a previous stage, as follows:
1.
Shorting the emitter to collector of a transistor simulates saturation, or the full ON condition.
2. Shorting the emitter to base of a transistor cuts it off, and simulates an open circuit between emitter and collector.
5-57 Although a logical first choice might be to break the loop somewhere near its mid-point, and then perform successive subdividing test, it is
5-10
more useful to trace the loop from the series regulator backwards a stage at a time, since loop
TM 11-6625-2965-14&P failures occur more often at the higher power l e v e l s .
STEP
1
2
3 of Q3.
of Q1A.
ACTION
Table 5-4. High Output Voltage Troubleshooting
Check turn off of series regulator by shorting Q4 emitter to collector.
Check turn on of Q4 by disconnecting collector
Check turn off of Q3 by disconnecting collector
RESPONSE a. Output voltage b. Output voltage remains high.
d e c r e a s e s .
a. Output voltage remains high.
b. Output voltage decreases.
a. Output voltage remains high.
b. Output voltage decreases.
PROBABLE CAUSE a. Series regulator Q7
(or Q6) shorted.
b. Remove short and proceed to Step 2.
a. Q4 open.
b. Reconnect lead and proceed to Step 3.
a. Q3 shorted.
b, Check Q1A for short,
Q1B for open. Check for open strap between A6 and A8. Check R10 for open.
STEP
1
2
3
ACTION
Table 5-5.
Low Output Voltage Troubleshooting
Check turn on of Q7
(and Q6, if included) by opening the emitter of Q4 .
Eliminate the current limit circuit as a source of trouble by disconnecting the anode of
CR16.
Check turn off of Q4 by shorting Q3 emitter to collector.
RESPONSE a. Output voltage remains low.
b. Output voltage increases.
a. Output voltage increases.
b. Output voltage remains low.
a. Output voltage remains low.
b. Output voltage increases.
PROBABLE CAUSE a. Q7 (or Q6) open.
b. Reconnect lead and proceed to Step 2.
a. Q10 shorted, R81 defect i v e .
b. Reconnect lead and proceed to Step 3.
a. Q4 shorted.
b. Remove the short and proceed to Step 4.
5-11
TM 11-6625-2965-14&P
4 Check turn on of Q3 by shorting Q1A emitter to collector
Table 5-5. Output Voltage Troubleshooting (Continued)
RESPONSE PROBABLE CAUSE a .
Output voltage remains low b. Output voltage increases a. Q3 open b, Check Q1A for open, QlB for short. Check R10 for short or open strap between A7 and A6
5-58 REPAIR AND REPLACEMENT
5-59 Before servicing a printed wiring board, re-
fer to Figure 5-11. Section VI of this manual con-
tains a tabular list of the instruments replaceable parts. Before replacing a semiconductor device,
refer to Table 5-6 which lists the special charac-
teristics of selected semiconductors. If the device
to be replaced is not listed in Table 5-6, the
standard manufacturers part number listed in Section VI is applicable. After replacing a semicon-
ductor, refer to Table 5-7 for checks and adjust-
ments that may be necessary.
Table 5-6.
Selected Semiconductor Characteristics
REFERENCE
DESIGNATOR
Q1
Q7
CHARACTERISTICS
Matched differential amplifier. NPN Si. planar
70 (min.) h
FE i c
= lmA, V
CE
= 5V, Ico = 0.01µA
@ V cbo
= 5 V ,
NPN Power h FE = 35 (min.) @ Ic = 4A; V CE = 4V.
STOCK NO.
1854-0229
1854-0225
SUGGESTED
REPLACEMENT
2 N 2 9 1 G . E .
2N3055 R. C,A,
Table 5-7.
Checks and Adjustments After Replacement of Semiconductor Devices
REFERENCE FUNCTION CHECK ADJUST
I
Q1 R6 or R8
Q3, Q4
Q7 (Q6)
Q8, Q9
CR1, CR2
CR8
Constant voltage differential amplifier
Error amplifiers
Series regulater
Reference regulator
Limiting diodes
Forward bias regulator
Constant voltage (CV) line and load regulation.
Zero volt output.
CV load regulation.
CV transient response.
CV load regulation.
Reference circuit line regulation.
CV load regulation.
Voltage across diode
2.0 to 2.4 Volts.
R30
VR1, VR2,
CR20
5-12
TM 11-6625-2965-l4&P
Table 5-7.
Checks and Adjustments After Replacement of Semiconductor Devices (Continued)
REFERENCE FUNCTION CHECK ADJUST
Current limit adjustment.
R81 Q10, CR16
(CR21)
CR22 thru
CR29
VR1
VR2
Rectifier diodes
Positive reference voltage
Negative reference voltage
Voltage across appropriate filter capacitor.
+6.2V line and load regulation.
-6.2V line and load regulation.
R46, VR1
R46, VR2
5-60 ADJUSTMENT AND CALIBRATION
5-61 Adjustment and calibration may be required after performance testing, troubleshooting, or repair and replacement. Perform only those adjustments that affect the operation of the faulty circuit and no others.
5-62 METER ZERO
5-63 Proceed as follows to zero meter: a.
Turn off instrument (after it has reached normal operating temperature) and allow 30 seconds for all capacitors to discharge.
b.
Insert sharp pointed object (pen Point or awl) into the small hole at top of round black plastic disc located directly below meter face.
c .
Rotate plastic disc clockwise (
C W
) until meter reads zero, then rotate ccw slightly in order to free adjustment screw from meter suspension, If pointer moves, repeat Steps b and c.
5-64 AMMETER TRACKING
5-65 To calibrate the ammeter, proceed as follows: a.
Connect test setup as shown on Figure
5-4.
b. Set RANGE switch to low voltage mode and METER switch to lowest current range.
c .
Turn on supply and adjust VOLTAGE controls so that differential voltmeter indicates exactly 40Vdc.
d. Front panel meter should read 0.3 Amp for Model 6204B and 6205B supplies, or 0.1 Amp for Model 6206B supply. If it does not, adjust R72.
5-66 CONSTANT VOLTAGE PROGRAMMING CURRENT
5-67 Programming Accuracy. To calibrate the programming current, proceed as follows: of R13.
supply.
a.
Connect an 8K, 0.1% resistor (18K resistor for Model 6206B supplies) between terminals -S and A6 on rear barrier strip.
b.
Disconnect jumper between A7 and A8
(leaving A6 and A7 jumpered).
c.
Connect decade resistance box in place d. Connect differential voltmeter between
+S and -S terminals on rear barrier strip.
e .
Set RANGE switch to high voltage mode,
METER switch to high voltage range, and turn on f.
Adjust decade resistance box so that differential voltmeter reads 40 ± 0.4Vdc for
Models 6204B and 6205B or 60 ± 0.6Vdc for Model
6206B supplies, g . Replace decade resistance with resistor of appropriate value in R13 position.
5-68 Zero Output Voltage. To calibrate the zero
Volt programming accuracy, proceed as follows: a.
Connect differential 1 voltmeter between
+S and -S terminals.
b. Short out voltage controls by connecting jumper between terminals A6 and -S.
c .
Turn on supply and observe reading on differential voltmeter.
d.
If it is more positive than O Volts, shunt resistor R6 with a decade resistance box.
e.
Adjust decade resistance until differential voltmeter reads zero, then shunt R6 with resistance value equal to that of the decade resista n t e .
f.
If reading of Step c was more negative than 0 Volts, shunt resistor R8 with the decade resistance box.
g.
Adjust decade resistance until differential voltmeter reads zero then shunt R8 with a resistance value equal to that of the decade box.
5-13
5-14
TM 11-6625-2965-14&P
TM
11-6625-2965-14&P
5-69 REFERENCE CIRCUIT ADJUSTMENTS
5-70 Line Regulation. To adjust the line regulation capabilities of the instrument proceed as follows : a .
Connect the differential voltmeter between +S (positive) and 31 (common).
b. Connect variable voltage transformer between supply and input power source.
c.
Adjust line to 105Vac.
d. Connect decade resistance in place of
R46.
e .
Set range switch to high voltage mode and turn on supply.
f.
Adjust decade resistance so that voltage indicated by differential voltmeter does not change more than 1.08 millivolts for 6204B and 6205B or
.946mV for 6206B as input line voltage is varied from 105 to 125Vac.
g. Replace decade resistance with appropriate value resistor in R46 position.
5-71 CONSTANT VOLTAGE TRANSIENT RECOVERY
TIME
5-72 To adjust the transient response, proceed as follows: a .
Connect test setup as shown in Figure
5-8.
b. Repeat Steps a through f as outlined in
c.
Adjust R30 so that the transient response
5-73 CURRENT LIMIT ADJUSTMENT
5-74 To adjust the current limit so that the supply can be used to furnish maximum rated output current, proceed as follows: a.
Connect test setup shown in Figure 5-5.
b. Short out load resistor (Ry).
c .
Set RANGE switch to low voltage (high current) mode.
d. Turn on supply and rotate VOLTAGE controls fully clockwise (maximum).
e .
Adjust R81 until differential volt meter indicates 3.5Vdc for Models 6204B and 6205B supplies or 3.6Vdc for Model 6206B supply.
5-15
TM 11-6625-2965-14&P
SECTION VI
REPLACEABLE PARTS
6-1 INTRODUCTION
6-2 This section contains information for ordering
Table 6-4 lists parts in alpha-
numeric order by reference designators and provides the following information: a.
Reference Designators. Refer to Table 6-1.
b.
Description.
breviations.
c .
Total Quantity (TQ). Given only the first time the part number is listed except in instruments containing many sub-modular assemblies, in which case the TQ appears the first time the part number is listed in each assembly.
d.
Manufacturer’s Part Number or Type.
e .
Manufacturer’s Federal Supply Code Numbe r.
Refer to Table 6-3 for manufacturer’s name and
address.
f.
Hewlett-Packard Part Number.
9.
Recommended Spare Parts Quantity (RS) for complete maintenance of one instrument during one year of isolated service.
h.
Parts not identified by a reference desig-
nator are listed at the end of Table 6-4 under Me-
chanical and/or Miscellaneous.
The former consists of parts belonging to and grouped by individual assemblies; the latter consists of all parts not immediately associated with an assembly.
6-3 ORDERING INFORMATION
6-4 To order a replacement part, address order or inquiry to your local Hewlett-Packard sales office
(see lists at rear of this manual for addresses).
Specify the following information for each part:
Model, complete serial number, and any Option or special modification (J) numbers of the instrument;
Hewlett-Packard part number; circuit reference designator; and description.
To order a part not listed
in Table 6-4, give a complete description of the
part, its function, and its location.
A
B
C
CB
CR
DS
Table 6-1.
Reference Designators
= assembly
= blower (fan)
= capacitor
= circuit breaker
= diode
= device, signaling (lamp)
E
F
J
K
L
M
= miscellaneous electronic part
= fuse
= jack, jumper
= relay
= inductor
= meter
Table 6-1.
Reference Designators (Continued) s
T
P
Q
R
= plug
= transistor
= resistor
= switch
= transformer
TB = terminal block
TS = thermal switch v
V R x z
= vacuum tube, neon bulb, photocell, etc.
= zener diode
= socket
= integrated circuit or network
Table 6-2.
Description Abbreviations
A = ac = assy. = bd =
O bkt =
C .
cd = c o e f = comp .
CRT =
CT = dc =
DPDT =
DPST = elect = encap= o
F =
F .
fxd =
Ge =
H =
Hz =
IC =
ID = incnd .
k m
M
P
=
=
=
= m e t . = ampere alternating current assembly board bracket degree
Centigrade card c o e f f i c i e n t composition cathode-ray tube center-tapped direct current double pole, double throw double pole, single throw electrolytic encapsulated farad degree
Farenheit fixed germanium
Henry
Hertz integrated circuit inside diameter incandescent kilo = 10 3 mini = 10-3 mega . 10 6 micro = 10 - 6 metal mfr .
mod. = mtg = n .
NC =
NO =
NP =
Ω obd =
OD =
P =
P . C . = pot. = p-p .
ppm = pvr = rect = rms =
Si
SPDT =
SPST =
SS =
T = tan. =
Ti = v = var =
WW = w = manufacturer modular or modified mounting n a n o . 1 0 - 9 normally closed normally open nickel-plated ohm order by description outside diameter pico =
10-
12 printed circuit potentiometer peak-to-peak parts per million peak reverse voltage rectifier root mean square silicon single pole, double throw single pole, single throw small signal slow-blow tantulum titanium volt variable wirewound
Watt
6-1
TM 11-6625-2965-14&P
Table 6-3. Code List of Manufacturers
6-2
Table 6-3.
Code List of Manufacturers (Continued)
TM 11-6625-2965-l4&P
6 - 3
TM 11-6625-2965-14&P
Table 6-3.
Code List of Manufacturers (Continued)
6-4
TABLE 6-4. REPLACEABLE PARTS
REF.
DESIG.
C1
C2-4,6-8,
11,13,15,
17-19
C5
C9
C10,12
C14
C16
C20
CR1,2
CR3-5,9,
10,12-15,
18,19,21,
30-33
CR6
CR7,8
CR11
CR16
CR17
CR20
CR22-29,34
DS1
F1
Q1
Q2,5,6
Q3
Q4
Q7
Q8
Q9,10
R10
R12
R13
R29
R30
R31
R33
R1
R2
R3,4
R5
R6
R7,9,11
14-28,
32,35-40,
48,50,59
62-71,
74-79,
82-86
R8
DESCRIPTION
FXD, ELECT 5µ 65VDC
NOT ASSIGNED
FXD, FILM . 001µ 200VDC
FXD, ELECT 4.7
Ω
F 35VDC
FXD, ELECT 100µUF 50 VDC
FXD, ELECT 490µF 85 VDC
FXD, CERAMIC .05µF 400VDC
FXD, ELECT 80µF 300VDC
RECT. SI. 250MA 200PRV
NOT ASSEIGNED
RECT. SI. 400MW 10PRV
RECY. SI. 400MW 10PRV
RECY. SI. 500MA 200 PRV
RECT. SI. 250MA 200PRV
RECT. SI. 500MA 200PRV
RECT. SI. 250MA 200PRV
RECT. SI. 500MA 200PRV
LAMP NEON
FUSE CARTRIDGE 2A 250V 3AG
SS NPN DIFF. AMP
NOT ASSIGNED
SS PNP SI.
SS PNP SI.
POWER, NPN SI.
SS PNP SI.
SS NPN SI.
FXD, WW 1KW ±5% 3W
FXD, MET. FILM 6.2KW µ1% 1/8W
FXD, MET. FILM 23KW µ1% 1/8W
FXD, MET. FILM 1.5KW ±1% 1/8W
FXD, COMP 360KW ±5% ½W
NOT ASSIGNED
FXD, COMP 560KW ±5% 1/2W
VAR. WW DUAL 10K-100
FXD, WW 1.3KW ±5% 3W
FXD, COMP (SELECTED) ±5% 1/2W
FXD, COMP 5.1KW ±5% 1/2W
VAR. WW 5KW (MODIFY)
FXD, COMP NKW ±5% 1/2W
FXD, COMP 2.4KW ±5% 1/2W
-
2
2
2
2
4
2
2
2
-
EB-5645
242E1325
TYPE EB (OBD)
EB-5125
TYPE 110-F4
EB-1025
EB-2425
TM11-6625-2965-14&P
2
2
2
-
2
2
4
8
TQ
2
MFR. PART NO.
-
192P10292
150D475X9035B2
33C17A
1N485B
1
1
2
-
4
2
2
4
2
2
4
2
2
-
2
4
22
-
1N4828
1N4830
1N3253
1N485B
1N3253
1N485B
1N3253
312002
-
242E1025
TYPE CEA T-O
TYPE CEA T-O
TYPE CEA T-O
EB-3645
MFR.
CODE
09182
-
56289
56289
09182
09182
56289
09182
93332
-
03508
03508
02735
93332
02735
93332
02735
09182
75915
09182
-
09182
09182
09182
09182
09182
56289
07716
07716
07716
01121 hp
PART NO.
0180-1836
-
0160-0153
0180-0100
0180-1852
0180-1888
0150-0052
0180-1851
1901-0033
-
1901-0461
1901-0460
1901-0389
1901-0033
1901-0389
1901-0033
1901-0389
2140-0244
2110-0002
1854-0229
-
1853-0099
1853-0041
1854-0225
1853-0099
1854-0071
0813-0001
0698-5087
0698-3269
0757-0427
0686-3645
-
01121
09182
56289
01121
01121
11236
01121
01121
-
0686-5645
2100-0997
0811-1803
0686-5125
2100-1824
0686-1025
0686-2425
-
1
1
1
1
1
1
1
1
5
2
-
4
2
2
4
1
1
1
1
1
-
2
4
9
1
1
1
-
1
1
1
6
RS
1
6-5
R34
R41
R42
R43
R44
R45
R46
R47
R49
R51
R52
R53
R54,55
R56
R57
R58
R60
R61
R72
R73
R80
R81
R87
S1
S2
T1
VR1
VR2
TM11-6625-2965-14&P
REF.
DESIG.
DESCRIPTION
FXD, COMP 300
Ω
±5% 1/2W
RXD, COMP 12K
Ω
±5% 1/2W
FXD, COMP 6.8K
Ω
±5% 1/2W
FXD, MET, FILM 470
Ω
±1% 1/4W
FXD, COMP 47K
Ω
±5% 1/2W
FXD, COMP 5.1K
Ω
±5% 1/2W
FXD, COMP 100K
FXD, COMP 680
Ω
Ω
±5% 1/2W
±5% 1/2W
FXD, MET. OX 3K
Ω
±5% 2W
FXD, COMP 20K
Ω
±5% 1/2W
FXD, MET. FILM 1.21K
Ω
±1% 1/8W
FXD, COMP 470
Ω
±5% 1/2W
Ω
FXD, WW 5 ±0.5% 1/2W
FXD, MET. FILM 1.69K
Ω
±1% 1/8W
FXD, MET. FILM 3.57K
Ω
±1% 1/8W
FXD, MET. FILM 196
Ω
±1% 1/8W
FXD, MET. FILM 4.81K
Ω
±1% 1/4W
FXD, MET. FILM 45K
Ω
±1% 1/8W
VAR. WW 250
Ω
(MODIFY)
FXD, MET. FILM 42.2
Ω
_1% 1/8W
FXD, COMP 33K
Ω
±5% 1/2W
VAR. WW 1K
Ω
THERMISTOR 64
Ω
±10%
SWITCH, PILOT LIGHT (RED)
PUSH ON/OFF SPDT
ROTARY SWITCH CONCENTRIC SHAFTS
TRANSFORMER, POWER
DIODE, ZENER 6.2V
DIODE, ZENER 6-19V ±5% 400MW
MISCELLANEOUS
COVER, TOP
CHASSIS, RIGHT
CHASSIS, LEFT
PANEL, FRONT
BINDING POST (MAROON)
BINDING POST(BLACK)
KNOB, BLACK (WITH POINTER)
KNOB, RED
KNOB, BAR, RED )WITH POINTER)
KNOB, BLACK
METER 2 1/2" DUAL SCALE 0-50V 0-.75A
BEZEL, METER 1/6 MOD
SPRING, METER
GUARD, BARRIER STRIP
CABLE CLAMP
STRAIN RELIEF BUSHING
LINE CORD PLUG PH151 7 1/2'
JUMPER, BARRIER STRIP
PLASTIC EXTRUDSION BARRIER STRIP
BARRIER BLOCK
FUSEHOLDER
TQ MFR. PART NO.
1
2
1
2
2
2
4
2
2
2
2
2
2
2
2
2
1
2
2
2
2
2
2
2
2
2
2
EB-3015
EB-1235
EB-6825
TYPE CEB T-O
EB-4735
EB-5125
EB-1045
EB-6815
TYPE C42S
EB-2035
TYPE CEA T-O
EB-4715
TYPE E-30
TYPE CEA T-O
TYPE CEA T-O
TYPE CEA T-O
TYPE CEB T-O
TYPE CEA T-O
TYPE 110-F4
TYPE CEA T-O
EB-3335
TYPE 110-F4
LB16J1
54-61681-26 A1H
1N821
1N753
1
10
1
1
1
2
8
1
1
1
2
4
2
2
2
2
2
2
1
1
1
DF21BC
T4-4
SR-5P-1
KH-4096
422-13-11 013
342014
MFR.
CODE
01121
01686
07716
07716
07716
07716
07716
11236
07716
01121
11236
02606
01121
01121
01121
07716
01121
01121
01121
01121
16299
01121
07716 hp
PART NO.
0686-3015
0686-1235
0686-6825
0698-3506
0686-4735
0686-5125
0686-1045
0686-6815
0698-3642
0686-2035
0757-0274
0686-4715
0811-1920
0698-4428
0698-3496
0698-3440
0698-5147
0698-5091
2100-0439
0757-0316
0686-3335
2100-0391
0837-0023
87034
09182
09182
06486
04713
3101-0100
3100-1913
9100-1821
1902-0761
1902-0049
09182
09182
09182
09182
09182
58474
09182
09182
09182
09182
09182
09182
09182
09182
79307
28520
70903
71785
09182
09182
75915
5000-6061
5060-6118
5060-6119
06205-00001
1510-0040
1510-0039
0370-0107
0370-0101
0370-0102
0370-0179
1120-1230
4040-0295
1460-0720
5020-5541
1400-0330
0400-0013
8120-0050
0360-1143
4040-0067
0360-1273
1400-0084
1
1
2
1
1
1
1
1
1
1
1
1
1
2
RS
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
6-6
TM11-6625-2965-14&P
REF.
DESIG.
DESCRIPTION
R10
R10
BRACKET, TRANSF. MFG
BRACKET, HEAT SINK
HEAT SINK, REAR
RUBBER BUMPER (FEET)
PRINTED CIRCUIT BOARD
RUBBER BUMPER, PRINTED CIRCUIT
BOARD
HEAT DISSIPATOR (Q7, Q4)
MICA INSULATOR (Q7, Q4)
INSULATOR, TRANSISTOR PINS (Q7, Q40
INSULATOR (Q7,Q4)
END CAPS
CARTON
OPTION 07
10-TURN OUTPUT VOLTAGE CONTROL
VAR. WW 10K
Ω
±5% (10 TURN)
KNOB
OPTION 13
10-TURN VOLTAGE CONTROL
WITH DECADIAL
VAR. WW 10K
Ω
±5% (10 TURN)
DECADIAL
TQ
3
2
2
4
4
2
1
2
2
1
4
1
2
2
2
2
MFR. PART NO.
MB50
4072
NF-207
734
RD-411
MFR.
CODE hp
PART NO.
09182
09182
09182
87575
09182
87575
05820
08530
09182
09182
09182
09182
06205-00002
5000-6060
0050-1035
0403-0088
06205-20020
0403-0086
1205-0033
0340-0174
0340-0166
0340-0168
9220-1218
9211-0848
09182
09182
09182
07716
2100-1866
0370-0137
2100-1866
1140-0020
RS
1
1
2
2
4
4
6-7
TM11-6625-2965-14&P
0686-5125
0698-3440
0698-3496
0698-3506
0698-5087
0757-0274
0757-0316
0757-0346
0757-0427
0757-0440
0813-0001
1N4830
1140-0020
1205-0033
1400-0084
PART
NUMBER
DF21BC
0150-0052
0160-0153
0180-0100
0180-1836
0180-1852
0180-1888
0370-0101
0370-0102
0370-0107
0686-1045
0686-2035
0686-3335
0686-4735
28480
28480
28480
28480
28480
28480
28480
28480
28480
28480
28480
03508
28480
28480
28480
28480
28480
28480
28480
28480
28480
28480
28480
FSCM
58474
28480
28480
28480
28480
28480
PART NUMBER - NATIONAL STOCK NUMBER
CROSS REFERENCE INDEX
NATIONAL
STOCK
NUMBER
PART
NUMBER
5940-00-738-6269
5910-00-797-4909
5910-00-965-9728
5910-00-752-4172
150D475X9035B2
150D475X9035B2
1510-0039
1853-0041
5910-00-974-6135
5910-00-931-7060
5910-00-884-1194
5355-00-068-4557
5355-00-906-8933
5355-00-926-5508
5905-00-195-6761
5905-00-903-6304
5905-00-997-5436
5905-00-222-5571
1853-0099
1854-0071
1854-0087
1854-0225
1854-0229
1901-0033
1901-0460
1901-0461
1902-0049
1902-3002
5905-00-279-2019
5905-00-828-0377
5905-00-407-0106
5905-00-431-6844
5905-00-469-2837
5905-00-858-9105
5905-00-981-7475
5905-00-998-1906
5905-00-917-0578
5905-00-858-6795
5905-00-932-0413
5961-00-103-3950
5355-00-584-0840
5999-00-871-9538
5920-00-881-4636
192P10292
2N3417
2100-0281
2100-0439
2100-1824
2100-1866
2140-0244
242E1025
30D105G050BA2
30D105G050BA2
3101-0100
3101-1248
312002
342014
734
8120-0050
56289
56289
28480
28480
75915
75915
08530
28480
56289
03508
28480
28480
28480
28480
28480
56289
28480
28480
28480
28480
28480
28480
28480
28480
FSCM
56289
56289
28480
28480
28480
28480
NATIONAL
STOCK
NUMBER
5910-00-177-4300
5910-00-752-4172
5940-00-738-6269
5961-00-931-8259
5961-00-450-4689
5961-00-137-4608
5961-00-824-7567
5961-00-072-0094
5961-00-867-9318
5961-00-821-0710
5961-00-867-9206
5961-00-937-3918
5961-00-911-9277
5961-00-252-1307
5910-00-993-8305
5961-00-937-3768
5905-00-918-7471
5905-00-851-3924
5905-00-892-9626
5905-00-110-0282
5240-00-951-3376
5905-00-504-4892
5910-00-691-1255
5910-00-130-2712
5930-00-918-4381
5930-00-476-9679
5920-00-280-5062
5920-00-881-4636
5970-00-840-5109
5625-00-052-4921
6-8
TM 11-6625-2965-14&P
SECTION VII
CIRCUIT DIAGRAMS
This section contains the circuit diagrams necessary for the operation and maintenance of this power supply. Included are: a.
Component Location Diagram, Figure
7-1, which shows the physical location and reference designator of parts mounted on the printed wiring board.
b.
Schematic Diagram, Figure 7-2, which illustrates the circuitry for the entire power supply. Voltages are given adjacent to test points, identified by encircled numbers on the schematic and printed wiring board.
7-1
TM ll-6625-2965-14&P
APPENDIX A
REFERENCES
DA Pam 310-4
DA Pam 310-7
TM 38-750
TM 750-244-2
TM 11-2019
TM 11-6625-203-12
TM 11-6625-654-14
TM 11-6625-822-12
TM 11-6625-2616-14
TM 11-6625-2658-14
TM 11-6625-2724-12
TB 43-180
Index of Technical Manuals, Technical Bulletins,
Supply Manuals (Types 7, 8, and 9), Supply
Bulletins, and Lubrication Orders.
US Army Equipment Index of Modification Work
Orders.
The Army Maintenance Management System (TAMMS).
Procedures for Destruction of Electronics Materiel to Prevent Enemy Use (Electronics Command).
Test Sets 1-49, 1-49-A, and 1-49-B and Resistance
Bridges ZM-4A/U and ZM-4B/U.
Operatorfsand Organizational Maintenance: Multimeter AN/uRM-105 AND AN/URW105C (Including Multimeter,
ME-77/u and ME-77C/[T).
operators,
Organizational, Direct Support, and
General Support Maintenance Repair Parts and
Special Tools List (Including Depot Maintenance
Repair Parts and Special Tools List) for
Multimeter AN/USM-223.
Operator and Organizational Maintenance Manual;
Signal Generator SG-321B/U.
Operator’s Organizational, Direct Support, and
General Support Maintenance Manual; Digital
Voltmeter AN/GSM-64A.
Operator’s, Organizational, Direct Support, and
General Support Maintenance Manual for Oscilloscope AN/uSM-281C (NSN 6625-OO-1O6-9622).
Operator’s and Organizational Maintenance Manual:
Voltmeter, Electronic ME-202C/U (NSN 6625-00-972-4046),
Calibration Requirements for the Maintenance of
Army Materiel.
A-1
TM 11-6625-2965-14&P
APPENDIX B
COMPONENTS OF END ITEM LISTING
ICOEIL
1 each Power Supply HP 6205B
BILL
Technical Manual TM 11-6625-2965-14&P
AAL
N/A
6625-00-437-4861
N/A
B-1
APPENDIX C
MAINTENANCE ALLOCATION
TM 11-6625-2965-14&P
Section 1.
INTRODUCTION
C -1. General
This appendix provides a summary of the maintenance operations for the PP-7548/U. It authorizes categories of maintenance for specific maintenance functions on repairable items and components and the tools and equipment required to perform each function. This appendix may be used as an aid in planning maintenance operations.
C-2. Maintenance Function
Maintenance functions will be limited to and defined as follows:
a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/ or electrical characteristics with established standards through examination.
b. Test. To verify serviceability and to detect incipient failure by measuring the mechanical or electrical characteristics of an item and comparing those characteristics with prescribed standards.
c. Service. Operations required periodically to keep an item in proper operating conditions, i.e., to clean (decontaminate), to preserve, to drain, to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air supplies.
d. Adjust To maintain, within prescribed limits, by bringing into proper or exact position, or by setting the operating characteristics to the specified parameters.
e. Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
f. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test measuring and diagnostic equipments used in precision measurement. Consists of comparisons of two instruments, one of which is a certified standard of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being compared.
g. Install. The act of emplacing, seating, or fixing into position an item, part, module (component or assembly) in a manner to allow the proper functioning of the equipment or system.
h. Replace. The act of substituting a serviceable like type part, subassembly, or module (component or assembly) for an unserviceable counterpart.
i. Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate, replace) or other maintenance actions (welding, grinding, riveting, straightening, facing, remachining, or resurfacing) to restore serviceability to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, module (component or assembly), end item, or system.
j. Overhaul. That maintenance effort (service/ action ) necessary to restore an item to a completely serviceable/operational condition as prescribed by maintenance standards (i.e., DMWR) in appropriate technical publications. Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does not normally return an item to like new condition.
k. Rebuild. Consists of those services actions necessary for the restoration of unserviceable equipment to a like new condition in accordance with original manufacturing standards. Rebuild is the highest degree of materiel maintenance applied to Army equipment. The rebuild operation includes the act of returning to zero those age measurements (hours, miles, etc. ) considered in classifying Army equipments/components.
C-1
TM 11-6625-2965-14&P
C-3. Column Entries
a. Column 1, Group Number. Column 1 lists group numbers, the purpose of which is to identify components, assemblies, subassemblies, and mod- ules with the next higher assembly.
b. Column 2, Component/Assembly. Column 2 contains the noun names of components, assemblies, subassemblies, and modules for which maintenance is authorized.
c. Column 3, Maintenance Functions Column 3 lists the functions to be performed on the item listed in column 2. When items are listed without maintenance functions, it is solely for purpose of having the group numbers in the MAC and
RPSTL coincide.
d. Column 4, Maintenance Category. Column 4 specifies, by the listing of a “worktime” figure in the appropriate subcolumn (s), the lowest level of maintenance authorized to perform the function listed in column 3. This figure represents the active time required to perform that maintenance function at the indicated category of maintenance.
If the number or complexity of the tasks within the listed maintenance function vary at different maintenance categories, appropriate “worktime” figures will be shown for each category. The number of task-hours specified by the “worktime” figure represents the average time required to restore an item (assembly, subassembly, component, module, end item or system) to a serviceable condition under typical field operating conditions.
This time includes preparation time, troubleshooting time, and quality assurance/quality control time in addition to the time required to perform the specific tasks identified for the maintenance functions authorized in the maintenance allocation chart. SubColumns of column 4 are as follows:
C - Operator/Crew
0- Organizational
F- Direct Support
H - General Support
D - Depot
e. Column 5, Tools and Equipment. Column 6 specifies by code, those common tool sets (not individual tools) and special tools, test and support equipment required to perform the designated function.
f. Column 6, Remarks. Column 6 contains an alphabetic code which leads to the remark in
section IV, Remarks, which is pertinent to the
item opposite the particular code.
C-4. Tool and Test Equipment Requirement
(sect Ill)
a. Tool or Test Equipment Reference Code. The numbers in this column coincide with the numbers used in the tools and equipment column of the
MAC. The numbers indicate the applicable tool or test equipment for the maintenance functions.
b. Maintenance Category. The codes in this column indicate the maintenance category allocated the tool or test equipment.
c. Nomenclature. This column lists the noun name and nomenclature of the tools and test equipment required to perform the maintenance functions.
d. National/NATO Stock Number. This column lists the National/NATO stock number of the specified tool or test equipment.
e. Tool Number. This column lists the manufacturer’s part number of the tool followed by the
Federal Supply Code for manufacturers (5-digit) in parentheses.
C-5. Remarks (sect IV)
a. Reference Code. This code refers to the ap-
propriate item in section II, column 6.
b. Remarks. This column provides the required explanatory information necessary to clarify items
C-2
(1)
GROUP
NUMBER
00
(2)
C O M P O N E N T / A S S E M E L Y
SECTION II MAINTENANCE ALLOCATION
FOR
CHART
POWER SUPPLY PP-7548/U
(3)
M A I N T E N A N C E
FUNCTION c
(4)
MAINTENANCE CATEGORY o F H D
(5)
TOOLS
AND
EQPT.
(6)
REMARKS
Power Supply PP-7548/U I n s p e c t
S e r v i c e
T e s t
I n s p e c t
S e r v i c e
T e s t
A d j u s t
R e p a i r
O v e r h a u l
0 . 1
0 . 1
0 . 1
0.2
0.2
1 . 2
0 . 6
1 . 3
42
2
1
3
3
3-11
3-11
3
3-11
D
D
D c c
A
A
B
C-3
6
7
8
9
4
5
2
3
TOOL OR TEST
EQUIPMENT
REF CODE
1
10
11
MAINTENANCE
CATEGORY
0
0
H, D
H, D
H, D
H, D
H, D
H, D
H, D
H, D
H, D
SECTION III TOOL AND TEST EQUIPMENT REQUIREMENTS
FOR
POWER SUPPLY PP-7548/U
NOMENCLATURE
MULTIMETER AR/URM-105
TOOL KIT, ELECTRONIC EQUIPMENT TK-101/G
TOOL KIT, ELECTRONIC EQUIPMENT TK-105/G
GENERATOR, SIGNAL SG-321/U
MULTIMETER AN/USM-223/U
MULTIMETER, ELECTRONIC ME-260()/U
OSCILLOSCOPE AN/USM-281
RESISTANCE BRIDGE ZM-4()/U
TRANSFORMER, VARIABLE CN-16/U
VOLTMETER, DIGITAL AN/GSM()/64
VOLTMETER, ELECTRONIC ME-202()/U
NATIONAL/NATO
STOCK NUMBER
6625-00-581-2036
5180-00-064-5178
5180-00-610-8177
6625-00-674-7097
6625-00-999-7465
6625-00-965-1534
6625-00-106-9622
6625-00-500-9370
5950-00-235-2086
6625-00-022-7894
6625-00-709-0288
TOOL NUMBER
C-4
REFERENCE
CODE c
D
A
B
Exterior
Operational
Interior
All
SECTION IV.
REMARKS
POWER SUPPLY PP-7548/U
REMARKS
C-5
TM 11-6625-2965-14&P
APPENDIX D
MANUAL BACKDATING CHANGES
Manual backdating changes describe changes necessary to adapt this manual to earlier instruments. T O adapt the manual to serial numbers prior to 7L2301 inspect the following table for your serial number and then make the appropriate changes.
For serial numbers 7L4450 and up check for inclusion of change sheet.
CHANGE 1:
In the replaceable parts table, make the following changes:
Delete Q10.
Delete R51.
Change R53 to fxd, comp 10 ±5% ½W, EB-1005,
0 1 1 2 1 , p a r t N o . 0 6 8 6 - 1 0 0 5 .
Change R54 to fxd, ww 5.25 ±0.5% ½W, Type
E-30, 01686, Part No, 0811-1921.
Change R81 to var. ww 100 , Type 110-F4,
11236, Part No. 2100-0281.
On the schematic remove transistor Q10 in current limit circuit and connect circuit as shown in
Figure B-1.
The circuit description Paragraph 4-19 should now
read as follows:
4-19 Current limiting occurs when diode CR16 becomes forward biased. Its anode potential is determined by the voltage at the base of Q4.
The cathode potential of CR16 is determined by the voltage drop acress resistors R53 and R81
Figure B-1.
which, in turn, are connected across the current sampling resistor(s). The cathode potential of CR16 is a function of the output current.
A
S this current increases, the drop across the sampling network increases, and CR16 will start to conduct.
Conduction of this diode clamps the base of Q4 to a potential which decreases the conduction of the series regulator, thus limiting the output current, Potentiometer
R81 permits the cathode potential of CR16 to be varied and thus charges the current limiting threshold.
Paragraph 5-52, Step (e) should read:
“Adjust R81 until differential voltmeter indicates
2.55 Vdc . . . .”
D-1
TM 11-6625-2965-14&P
Option 11, Overvoltage Protection “Crowbar”
DESCRIPTION:
This option is installed in DC Power Supplies, 6200B, 6201B, 6202B, 6203B, 6204B, and 6206B, and tested at the factory. It consists of a printed circuit board, screwdriver-type front panel potentiometer, and six wires that are soldered to the main power supply board.
The crowbar monitors the output voltage of the power supply and fires an SCR that effectively shorts the output when it exceeds the preset trip voltage.
The trip voltage is determined by the setting of the
CROWBAR ADJUST control on the front panel.
The trip voltage range is as follows:
Model
Trip Voltage Range
6200B
2.5-44V
6201B
2.5-23V
6202B
2.5-44V
6203B
2.5-10V
6204B
2.5-44V
6205B
2.5-44V
6206B
2.5-65V
To prevent transients from falsely tripping the crowbar, the trip voltage must be set higher than the power supply output voltage by the following margin: 4% of the output voltage plus 2V. The margin represents the minimum crowbar trip setting for a given output voItage; the trip voltage can always be set higher than this margin.
OPERATION:
1. Turn the CROWBAR ADJUST fully clockwise to set the trip voltage to maximum.
2.
Set the power supply VOLTAGE control for the desired crowbar trip voltage. To prevent false crowbar tripping, the trip voltage should exceed the desired output voltage by the following amount: 4% of the output voltage plus 2V.
3. Slowly turn the CROWBAR ADJUST ccw until the crowbar trips, output goes to 0V or a small positive voltage.
4. The crowbar will remain activated and the output shorted until the supply is turned off. To reset the crowbar, turn the supply off, then on.
5.
If the CROWBAR must be completely disabled, remove the lead attached to the CROWBAR ADJUST potentiometer R5.
D-2
TM11-6625-2965-14&P
Q1,2
R1
R2
R3
R4
R5
R6
R7
R8
T1
VR1
VR2
REF.
DESIG.
C1
C2
CR1-CR3
CR4
DESCRIPTION
FXD, ELECT 1µF 50VDC
FXD, MICA 510µF 500VDC
RECT. SI. 200MA 200PRV
SCR 7.4A 100PRV
SS NPN SI.
FXD, MET. FILM 10
Ω
±1% 1/8W
FXD, COMP 3K
Ω
±5% 2W
FXD, MET. FILM 1.21L
Ω
±1% 1/8W
FXD, MET. FILM 7.5K
Ω
±1% 1/8W
VAR. WW 10K
Ω
±5%
FXD, WW 1K
Ω
±5% 3W
FXD, COMP 22
Ω
±5% 1/2W
FXD, MET. FILM 196
Ω
±1% 1/8W
TRANSFORMER, PULSE
DIODE, ZENER 6.19V±5%
DIODE, ZENER 2.37V±5%
MISCELLANOEUS
PRINTED CIRCUIT BOARD (BLACK)
P.C. BOARD (INCLUDES COMPONENTS)
HEAT SINK
INSULATOR (CR4)
MICA WASHER
1
1
1
2
2
4
2
2
2
2
2
2
2
2
1
2
2
TABLE A-1. REPLACEABLE PARTS
TQ
2
2
6
2
MFR. PART NO.
30D105G050BA2
RCM15E511J
1N485B
C20B
MFR.
CODE
56289
04062
93332
03508
2N3417
TYPE CEA T-O
TYPE C42S
TYPE CEA T-O
TYPE CEA T-O
242E1025
EB-2205
TYPE CEA T-O
1N753
1N4370
03508
07716
16299
07716
07716
09182
56289
01121
07716
09182
04713
04713 hp
PART NO.
0180-0108
0140-0047
1901-0033
1884-0032
1854-0087
0757-0346
0698-3642
0757-0274
0757-0440
2100-1854
0813-0001
0686-2205
0698-3440
5080-7122
1902-0049
1902-3002
09182
09182
09182
09182
09182
06205-20021
06205-60021
06205-00003
0340-0462
2190-0709
1
1
4
1
1
1
1
1
1
1
1
1
2
2
RS
1
1
6
2
D-3
TM 11-6625-2965-14&P
D-4
Figure A-1.
Models 6200B, 6204B, and 6205B* Overvoltage Protection “Crowbar”
*For Model 6205B the above circuit is duplicated on each half of the assembled board, 06205-60021.
ITM 11-6625-2965-14&P
MANUAL CHANGES
Model 6205B DC Power Supply
Manual HP Part No. 06205-90002
Make all corrections in the manual according to errata below, then check the following table for your power supply serial number and enter any listed change(s) in the manual.
The primary wiring of the unit is now as shown below.
Prefix
SERIAL
Number
ALL
7L
7L lC
1140A
5451 - 5900
5901 - 6200
6201 - 6300
6301 - u p
MAKE
CHANGE S
Errata
1
1,2
1 , 2 , 3
1 , 2 , 3 , 4
ERRATA:
On Page 3-1, in Paragraph 3-2, delete step (b)
and reletter following steps appropriately; change step (c) to read: “Set range switch to desired operating mode. . . ”; change step (d) to read: “Adjust coarse and fine voltage controls until. . ."
On Page 5-4, in Paragraph 5-16, change steps (b)
through (d) to read as follows: b. Set METER switch to low current range and
RANGE switch to high voltage mode.
c, Turn on supply and adjust VOLTAGE controls until front panel meter indicates exactly 300mA
(0.5 ampere for Model 6206B supplies).
d. Differential voltmeter should read 1.5 ±
0.045Vdc.
CHANGE 1:
In the replaceable parts table, make the following change:
Terminal Strip: Add, HP Part No. 0360-0401.
CHANGE 2:
In the replaceable parts table, make the following c h a n g e s :
S1: Change to H P P a r t N o . 3 1 0 1 - 1 2 4 8 .
In miscellaneous:
Panel, Front: Change to HP Part No. 06205-00004.
CHANGE 3:
In the replaceable parts table and on the schematic make the following changes:
Tl: Change to HP Part No. 9100-2611.
CHANGE 4:
The Serial Prefix of this unit has been changed to
1140A. This is the only change.
ERRATA : in the instructions for auto-series operation in
paragraph 3-33, change the third sentence to
r e a d :
“The value of Rx is this voltage divided by the voltage programming current of the slave supply (l/Kp, w h e r e K p is the r e s i s t a n c e p r o g r a m ming coefficient for constant voltage operation). “
The voltage programming current of the Model
6205B is 1/200 ohms per volt, or 5 milliamps.
On page A-1 under Description, add “6205B” to the first sentence. Also change the second sentence of the second paragraph to read, “The trip voltage is determined by the setting of the crowbar adjust control on the front panel (except in the Model 6205B, where it is accessible through a hole in the top cover). “ Also on page A-1, change the last part of the third step under Operation to read “. . . output goes to O volts or a small positive voltage. “
On the schematic and in the parts list, change resistor R12 (for both dual supplies) to 1.4k
5% 3W 30 ppm, HP Part No. 0811-1804.
D-5
Manual Changes/Model 6205B
TM 11-6625-2965-14&P
DESCRIPTION
Front Panel, Lettered
Chassis, Right Side
Chassis, Left Side
Cover, Top
Rack Kit (accessory)
STANDARD
06205-00005
5060-7956
5060-7955
5000-9424
14523A
Heatsink 06205-60005
ERRATA:
In parts list, change HP Part No. of rubber bumper
(qty. 4) to 0403-0002.
In Figure 5-4, change Rx value listed for Model
6206B to 3 ohms.
In Table 1-1, change the INTERNAL IMPEDANCE
AS A CONSTANT VOLTAGE SOURCE (Output Impedance) specification to read as follows:
Output Impedance (Typical): Approximated by a 25 milliohm resistance in series with a 1 micro henry inductance.
The standard colors for this instrument are now mint gray (for front panel) and olive gray (for all other external surfaces). Option X95 designates use of the former color scheme of light gray and blue gray.
Option A85 designates use of a light gray front panel with olive gray used for all other external surfaces. New part numbers shown above.
In Figure 3-9, delete the six references to TP23.
These wires must be connected in the appropriate power supply directly to the end of R54 that is towards the rear of the supply. Another correction needed in this figure is that the wire from terminal
A6 in Slave No. 1 in the two-unit example at the top of the figure should be connected to the rear of R54 in the master supply. Note: The range switches of the master and slave supplies must be set to the same range when operating in autoparellel.
Add to the parts list the replacement lamp for illuminated switch 3101-1248, which is used in those supplies that include Change 2. The HP
Part No. of the type A1H lamp is 2140-0244.
HP PART NO.
OPTION A85
0 6 2 0 5 - 6 0 0 0 4
1 4 5 2 3 A - A 8 5
OPTION X95
5060-6118
5060-6119
5000-6061
06205-60002
ERRATA:
Effective January 1, 1977, Option 007 (1O-turn voltage control) has been redesignated Option 009, and Option 013 (1 O-turn voltage control with deca dial) has been redesignated Option 015. Make these changes wherever Option 007 or 013 is mentioned in the manual.
The front panel binding posts have been changed to a type with better designed insulation.
Delete the two types of posts listed on page 6-6 of the parts list and add : black binding post, HP Part No. 1510-
0114 (qty. 4); and red binding post HP Part No.
1510-0115 (qty. 2).
● The corrugated shipping carton for this model has been changed to HP Part No. 9211-2570. Two
9220-2703 floater pads are used.
The blue-gray meter bezel has been replaced by a black one, HP Part No. 4040-0414.
8-5-77
D-6
Figure 7-1. Component Location Diagram
TM 11-6625-2965-14&P
Figure 7-2. Schematic Diagram, Model 6205B
By Order of the Secretary of the Army:
Official:
J. C. PENNINGTON
Major General, United States Army
The Adjutant General
Distribution:
Active Army:
TSG (l)
USAARENBD (1)
USAINSCOM (2)
TRADOC (2)
DARCOM (1)
TECOM (2)
OS Maj Cmd (2)
USACC (2)
HISA Ft Monmouth (21)
Armies (1)
USASIGS (10)
Svc Colleges (1)
Ft Richardson (CERCOM Oft) (1)
Ft Carson (5)
Ft Gillem (10)
USMR (1)
USA ERDAA(l)
USAERDAW (1)
Army Dep (1) except:
LBAD (10)
SAAD (30)
TOAD (14)
SHAD (3)
USA Dep (1)
Sig Sec USA Dep (1)
Units org under fol TOE:
29-134 (1)
29-136 (1)
29-207 (2)
NG: None.
29-610 (2)
USAR: None.
For explanation of abbreviations used, see AR 310-50.
E. C. MEYER
General, United States
Chief of Staff
A r m y
THE METRIC SYSTEM AND EQUIVALENTS
PIN: 044061-000

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Key features
- Programmable output for precise voltage and current control
- Constant voltage and constant current modes
- Over-voltage and over-current protection
- Remote sensing for accurate voltage regulation
- Low ripple and noise for sensitive applications
- Rack mountable for easy integration into test systems