POWER SUPPLY/AMPLIFIER
PS,‘A SERIES, MODEL 6824A
41
&
SERIAL NUMBER PREFIX 6F
Printed:
July, 1966
@ Stock Number: 06824-90001
Gv
+
COPYRIGHT AND DISCLAIMER NOTICE
Copyright - Agilent Technologies, Inc. Reproduced with the permission of Agilent
Technologies Inc. Agilent Technologies, Inc. makes no warranty of any kind with regard
to this material including, but not limited to, the implied warranties of merchantability
and fitness for a particular purpose. Agilent Technologies, Inc. is not liable for errors
contained herein or for incidental or consequential damages in connection with the
furnishing, performance, or use of this material or data.
MANUAL ClWNGES
DC POWER SUPPLY
Model 6824A
Manual Serial Number Prefix 6F
Make all corrections in the manual according to errata below, then check the following table for
power supply serial number and enter any listed change(s) in the ma1’1ua1.
CHANGE 1:
In the replaceable parts table, make the follaving changes:
06: Change to MOPOrOla, SS2109, @ Stock No. 1853-0037.
Fan Motor: Change to Howard 1175-06-4155, @ Stock No. 3140-0406.
Fan Blade: Change to Howard 6-128-125, @ Stock No. 3160-0098.
ERRATA: QS,,ll: Change to 2N2907A, Sprague, 56289, 1853-0099.
YOUI
MANUAL CHANGES
DC POWER SUPPLY
Model 6824A
Manual Serial Number Prefix 6F
Make all corrections in the manual according to errata below, then check the following table fox your
power supply serial
number and enter any listed
change(s) in the manual.
SERIAL
Prefix m
6F
AU
6E
0361-0710
0711-0760
MAKE
CHANGE$
1
Errata
1.2
Prefix Number CHANGES
SERIAL
6F 0761-UP 1,2,3
CHANGE 1: In the replaceable parts table, make the following changes:
QS: change TOSS PNP Si., SSZ109, Motorola. $ Part No. 1853-0037.
Fan Motor: Change to Howard 1175-06-4155, $ Stock No. 3140-0406.
Fan Blade: Change to Howard 6-128-125, ‘@ Stock No. 3160-0098.
ERRATAi Q5,11: Change to SS PNP Si.,
.CHANGE 2:
Tn the replaceable parts table make the following changes:
2N2907A, Sprague, $ Part No. 1853-0099.
ClO, 11: ‘Change to $ Part No. 0180-2193.
Add Clamp (ClO,Cll): Quantity 2, @! Part No. 0160-2149.
bCHANGE 3:
In Section II
of the manual, add The following note under rack mounting, two units:
NOTE
When rack mounting two units, attach the sides of the Unit6 TOgether using the 6-32 screw (supplied with the 14525A rack kit)
and the threaded insert nut attached to the right side of each unit
under the heat sink. Disregard the 6-32 hex nw’lockwasher SUP-
plied with the rack mounting kit,
MAKE
TABLE OF CONTENTS
SectIon
I
GENERAL INFORMATION
l-l
DescriPcion
l-3
Power Supply Features
1-7
Amplifier Features
l-10
Specifications
1-12
OPtionS
l-14
Accessories
1-16
Instrument Identification
1-19
Ordering Additional Manuals
I I INSTALLATION
2-1
Initial Inspection
2-3
Mechanical Check
2-5
Elmctric~l Check
2-7
Insmilation Data
2-9
Location
2-13
Rack Mounting
2-15
Input Power Requirements
2-17
Connections For 230 Volt
operation
2-19
Power Gable
2-22
Repackaging For Shipment
I I I OPERATING INSTRUCTIONS
3-l
Operating Controls And
Indicators
3-3
Operating
3-9
tieneral Notes And Operating 4-41
Modes
Considerations
3-10
Diagrams 3-l
3-13
External Resistors
3-15
Connecting Loads
3-19
Fine/Zero Control
3-21
Ground Loops
3-23
Reverse Current Loading
3-26
constant ,vo1tage
Operating Modes
3-27
Normal Operating Modes
3-30
Remote Sensing
3-35
Remote Programmixrg,
Positive output 3-4
3-40
Remote Programming,
Negative Output
3-42
Remote Programming,
Bipolar Output
3-47
Switchless Bipolar Programming 36
3-50
Power Supply With Super-
imposed AC Output
3-54
Constant Voltage Amplifier
With Remote Gain Control
3-61
Constant Current Operating
Modes
3-65
Selecting RS 3-9
3-70
Normal Operating Modes
3-73
Remote Prosrcmmins,
Bipolar O&put 3-10
Pass No.
1:1
Section
I I I OPERATING INSTRUCTIONS
1-I
l-l
l-l
1-l.
1-l
l-l
1-2
l-2
2-1
2-1
2-l
2-l 4-1
2-l
2-l. 4-3
2-1
2-2
2-2
2-3 4-26
2-3
3-1
3-l
3-1 4-37
3-l
IV PRINCIPLES OF OPERATION
4-9
4-14
4-18
4-19
4-28
4-30
4-33
4-35
v MAINTENANCE
3-2
3-2
3-2
3-2
3-2
5-l Introduction
5-3 General Measurement
5-8
5-10 Performance Test
5-12 Power Supply Tests
3-3
3-3
3-3
5-21 Amplifier Tests
5-24 Troubleshooting
5-26
5-34 Repair And Replacement
5-36 Adjustment And Calibration
5-38
3-5
5-40 Voltmeter Twoking
5-43 Ammeter Tracking
3-5
5-45
5-47 Current Limit Adjustment
3-7
3-7
3-6
3-10
VI REPLACEABLE PARTS
6-l Introduction
6-4
6-8
Paae No.
3-76 Switchloss Bipolar
Programming
3-76
Constant
Superimposed
Current Supply With
AC Output
3-81 Constant Current Amelifier With
Remote Gain Con&l
3-87
Series And Parallel operatixlg
MO&S
3-90 Coordinated Series Operation
3-98 Auto-Parallel Operation
Overall Block Diagram
Discussion
Power Supply Operation
AmpXifier
Operation
Simplified Schematic
Detailed Circuit Analysis
Input circuit
Mode
Selection Circuit
Error And Driver Amplifiers
Regulator/Output Amplifier
Circuit
Current Limiting Circuit
Reference Circuit
Meter Circuit
Auxiliary Voltage Source
Techniques
Test Equipmant Required
Trouble Analysis
Meter Zero
Programming Current
Ordering Information
Reference Designators
Abbreviations
Manufacturers
Code List of Manufacturers
Parts List Table
3-11
3-11
3-12
3-12
3-13
3-15
4-l
4-l
4-l.
4-2
4-2
4-3
4-3
4-3
4-4
4-4
4-4
4-4
4-4
4-4
5-l
5-1
5-l
5-l
5-3
5-3
5-6
5-6
5-6
5-11
5-12
5-12
5-12
5-12
5-12
5-13
6-l
6-1
6-1
6-2
LIST OF TABLES
Table
l-1
5-1
5-2
5-3
5-4
5-5
Fi’wrc
l-l
2-l
2-2
2-3
3-l
3-2
3-3
3-4
3-5
3-6
3-10
3-11
3-12
3-13
3-14
3-15
3-16
3-17
Specifications 1-3
Page NO.
Test Equipment Required
Reference Circuit Troubleshooting
5-2
5-7 5-7
nigh Positive Output Voltage
Troubleshooting
5-8
High Negative Output Voltage
Troubleshooting
5-8
LOW Positive output Voltage
Troubleshooting
5-8
LIST OF ILLUSTRATIONS
DC Power Supply/Amplifier
Rock Mounting, Two Units
Rack Mounting, One Unit
Primary Connections
Front Panel Controls And Indtcators
Standard Power Supply
Operation (CV)
Standard Amplifier Operation (CV)
Remote Error Sensing
3-2
3-3
3-3
Remote Resistance Programming,
Positive Output
3-4
Unaligned Resistance
Programming Characteristics
3-4
Aligned Resistance Programming
Transfer Function
3-4
Remote Resistance Programming,
Negative Output
3-5
Remote Resistance Programming,
l&Polar Output (CV)
Swit,ched Resistor Substitutes
3-s
3-6
Ei-Polar Programming
(cO~St~,,t VQltage)
3-6
Constant Voltage Supply With
Superimposed AC Output
3-7
Constant Voltage Ampllfler With
Linear Remote Gain Control
3-8
Constant Voltage Amplifier,
TWO Inputs
3-8
Current Sampling Resistor,
Connection Method
3-9
Standard Constant Current
Power
supply
3-10
Standard Constant
Current Ampltrler
3-10
Table
5-6
5-8
5-9
5-10
3-19
3-20
3-21
3-22
3-23
3-24
3-25
3-26
3-27
3-28
4-1
4-2
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
'5-9
5-10
5-11
Page NO.
Low Negative Output Voltage
Troubleshooting
Common Troubles
5-9
5-9
Selected Semiconductor
Characteristics
5-11
Checks And Adjustments After Replace-
ment of Semiconductor Devices
Calibration Adjustment Summary
5-11
5-12
eogc No
Remote Resistance Programming.
Bloolar outwut (CC)
3-11
Swi~chlessB~pbl~rPr~gramming(CC)3-11
CC Power Supply With Super-
imposed AC Output
3-11
CC Amplifier With Linear
Remote Gain Control
CC Ampllfler With Two Inputs
3-12
3-13
Auto-Series Operation, Two Units 3-l 3
Auto-Series Operation, Three Units 3-14
Balanced Input/Output Series
Operation, Two Units
3-1.4
Balanced Input/Ou’Cput Series
Opetation,‘Four Units
3-15
Auto-Parallel Operation.
Constz.nr voltige output
3-16
Auto-Parallel Operation,
coLstant current output
Overall Block Diagram
Simplified Schematic
3-16
4-1
4-2
Front Panel Terminal Connections 5-l
Differential Voltmeter Substitute,
Test setup
Output Current,
Test
Setup
Load Regulation, Test Setup
Transient Response, Test Setup
Transient Response Waveforms
Programming Speed, Test Setup
5-3
5-3
5-4
5-4
5-5
5-5
ryp1co1 Programmixlg Speed
WaVefOrmS
Output Impedance, Test Setup
GbinAnd Frequency
Respdnse,
Test setup
Servicing Printed Wiring Boards
5-5
5-5
5-6
S-10
-
Figure 1-l. DC Power Supply/Amplifier, Model 6824A
SECTION I
GENERAL INFORMATION
l-l
DESCRIPTION
1-2 The Power Supply/Amplifier (PS/A) shown on
Figur$ l-1, is D general purpose instrument useful in any laboratory engaged in research and
development of electronic systems or components.
The PS/A CB” be operated in one of two basic
operating modes: power supply or amplifier. Ter-
minals on the rear barrier strip permit access to
vwIous control points within the unit to further
expand the operating capabilities of the lnstrumerit. The resulting flexibility lends the PS/A to
an almost unlimited “umber of applications. Some
of these applications we outlined in Section III of
this manual; but e more comprehensive description
of the features and applications of the PS,‘A are
lncludcd in Applicatibn Note 82 published by the
Harrison Dlvtslon. A copy of Application Note 82
can be obtained from your local Hewlett-Packard
field office. The following paragraphs describe
some of the features of the, PS/A both as D power
supply and an amulifier.
1-3 POWER SUPPLY FEATURES
l-4 The unit can be made to function as a regulated dc power supply by setting the front panel
MODE switch to the SUPPLY position. The supply
can furnish either a Constant Voltage output or a
Constant Current output (with the addition of B”
external current sampling resistor). The dc out-
put is bi-polar and is continuously adjustable
from its maximum rated positive value to a” equal
negative value: smoothly through zero with no
polarity switch. Both the supply and the load ere
protected ageinst overloads by a fixed current
limit which is set by means of B” internal adjustment.
1-S The supply can he programmed (controlled)
at a very high rate of speed (less than 50 psec
for output voltage change over the entire voltage
span). The supply can be programmed locally; by
means of the front panel control. or remotely: by
means of a resistance, voltage. or current source.
1-6 A single meter is used to measure dc output
voltage or current. A front panel METER switch
allows the dual purpose selection.
l-7 AMPLIFIER FEATURES
1-8 As a power amplifier the unit has a high
signal-to-noise ratio (80 db et full output) e”d en
‘adjustable gain of from 0 to 10 (20 db). The out-
put distortio”.is low - less than 0. 02% et 1 KHz.
The amplifier contains a push-pull output Stage
That can oe” furnish either B Constant Voltage
output or a Constant Current output (with the sddition of en external current sampling resistor).
The external input can be
from
either B voltage or
a current source. The bandwidth of the amplifier
is from dc to 20KHz (+3db).
1-9 The oo component of the output signal can
be measured with the front panel meter (Model
6824~ only).
I-10 SPECIFICATIONS
1-11 Detailed specification for the PS/A are given
in Table 5-l.
1-12 OPTIONS
1-13 Options are factory modifications of d standard instrument that ore requested by the customer.
The following option is available for the instrument covered by this manual.
Option No. DeSCriutlon
28 Rewire For 23OV AC Input: Supply
OS normally shipped is wired for 115
vat input. option 28 CO”SiSTU of
reconnecting the input transformer
for 230 Vat operation.
l-14 ACCESSORIES
1-15 The applicable accessories lisrad in the fol-
lowing chqrt may be ordered with the lnsrrumenf or
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