Agilent Technologies E3631A User manual

Service Guide
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The Agilent Technologies E3631A is a high performance 80 watt-triple output
DC power supply with G IB and RS-232 interfaces. The combination of bench-
top and system features in this power supply provides versatile solutions for
your design and test requirements.
Convenient bench-top features
• Triple output
• Easy-to-use knob control for voltage and current settings
• Highly visible vacuum-fluorescent display for voltage and current meters
• Tracking operation for ±25V outputs
• Excellent load and line regulation and low ripple and noise
• Operating states storage
• ortable, ruggedized case with non-skid feet
Flexible system features
• G IB (IEEE-488) and RS-232 interfaces are standard
• SC I (Standard Commands for rogrammable Instruments) compatibility
• I/O setup easily done from front-panel
Agilent E3631A
Triple Output
DC Power Supply

2
The Front Panel at a Glance
1 Meter and adjust selection keys
2Tracking enable/disable key
3Display limit key
4Recall operating state key
5Store operating state/Local key
6Error/Calibrate key
7 I/O Configuration / Secure key
8 Output On/Off key
9Control knob
10 Resolution selection keys
11 Voltage/current adjust selection key

3
1 Meter and adjust selection keys Select the output voltage and current o any one
supply (+6V, +25V, or -25V output) to be monitored on the display and allow knob
adjustment o that supply.
2 Tracking enable / disable key Enables / disables the track mode o ±25V supplies.
3 isplay limit key Shows the voltage and current limit values on the display and allows
knob adjustment or setting limit values.
4 Recall operating state key Recalls a previously stored operating state rom location
"1", "2", or "3".
5 Store operating state / Local key1 Stores an operating state in location "1", "2", or
"3" / or returns the power supply to local mode rom remote inter ace mode.
6 Error / Calibrate key2 Displays error codes generated during operations, sel -test
and calibration / or enables calibration mode (the power supply must be unsecured
be ore per orming calibration).
7 I/O Configuration / Secure key3 Con igures the power supply or remote inter aces
/ or secure and unsecure the power supply or calibration.
8 Output On/Off key Enables or disables all three power supply outputs. This key
toggles between two states.
9 Control knob Increases or decreases the value o the blinking digit by turning
clockwise or counter clockwise.
10 Resolution selection keys Move the lashing digit to the right or le t.
11 Voltage/current adjust selection key Selects the knob unction to voltage control
or current control.
1The key can be used as the "Local" key when the power supply is in the remote
interface mode.
2You can enable the "calibration mode" by holding down this key when you turn on
the power supply.
3You can use it as the "Secure" or "Unsecure" key when the power supply is in the
calibration mode.

4
Front-Panel Voltage and Current Settings
You can set the voltage and current from the front panel using the following
method.
1Press the key a ter turning on the power supply.
2Set the knob to the voltage control mode or current control mode using the voltage/
current adjust selection key.
3Move the blinking digit to the appropriate position using the resolution selection keys.
4Change the blinking digit to the desired value using the control knob.
5Press the key to enable the output. A ter about 5 seconds, the
display will go to the output monitor mode automatically to display the voltage and
current at the output.
Note All front panel keys and controls can be disabled with remote interface commands.
The Agilent E3631A must be in "Local" mode for the front panel keys and controls to
function.
Use the voltage/current adjust selection key, the resolution selection keys, and
the control knob to change the limiting or limitings value of voltage or current.
Display Limit
Output On/Off

5
Display Annunciators
Adrs Power supply is addressed to listen or talk over a remote interface.
Rmt Power supply is in remote interface mode.
+6V Displays the output voltage and current for +6V supply. Knob is active for
+6V supply.
+25V Displays the output voltage and current for +25V supply. Knob is active for
+25V supply.
-25V Displays the output voltage and current for -25V supply. Knob is active for
-25V supply.
CAL power supply is in calibration mode.
Track The outputs of +25V and -25V supplies are in track mode.
Limit The display shows the voltage and current limit value of a selected supply.
ERROR Hardware or remote interface command errors are detected and also the
error bit has not been.
OFF The three ouputs of the power supply are disabled.
Unreg The displayed output is unregulated (output is neither CV nor CC).
CV The displayed output is in constant-voltage mode.
CC The displayed output is in constant-current mode.
Toreviewthedisplay annunciators,hold down keyas you
turn on the power supply. Display Limit

6
The Rear Panel at a Glance
Use the front-panel key to:
•Select the GPIB or RS-232 interface (see chapter 3).
•Set the GPIB bus address (see chapter 3).
•Set the RS-232 baud rate and parity (see chapter 3).
1Power-line voltage setting
2Power-line fuse-holder assembly
3AC inlet
4Power-line module
5GPIB (IEEE-488) interface connector
6RS-232 interface connector
I/O Config

7
In This Book
Specifications Chapter 1 lists the power supply’s specifications and
describes how to interpret these specifications.
Quick Start Chapter 2 prepares the power supply for use and helps you get
familiar with the front-panel features.
Calibration Procedures Chapter 3 provides performance verification and
calibration procedures.
Theory of Operation Chapter 4 describes block and circuit level theory
related to the operation of the power supply.
Service Chapter 5 provides guidelines for returning your power supply to
Agilent Technologies for servicing, or for servicing it yourself.
Replaceable Parts Chapter 6 contains a detailed parts list of the power
supply.
Backdatin Chapter 7 describes the difference between this manual and
older issues of this manual.
Schematics Chapter 8 contains the power supply's schematics, disassembly
drawings, and component locator drawings.
If you have uestions relating to the operation of the power supply, call
1-800-452-4844 in the United States, or contact your nearest Agilent
Technologies Sales Office.

8

9
Contents
Contents
Chapter 1 Specifications
erformance Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15
Supplemental Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - 17
Chapter 2 Quick Start
To prepare the power supply for use - - - - - - - - - - - - - - - - - - - - - - 23
To check the rated voltages of the power supply - - - - - - - - - - - - 25
To check the rated currents of the power supply - - - - - - - - - - - - 27
To use the power supply in constant voltage mode - - - - - - - - - - 29
To use the power supply in constant current mode - - - - - - - - - - 31
To use the power supply in track mode- - - - - - - - - - - - - - - - - - - - 33
To store and recall the instrument state - - - - - - - - - - - - - - - - - - - 34
To rack mount the power supply - - - - - - - - - - - - - - - - - - - - - - - - - 36
Chapter 3 Calibration Procedures
Agilent Technologies Calibration Services - - - - - - - - - - - - - - - - - 41
Calibration Interval- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 41
Automating Calibration rocedures - - - - - - - - - - - - - - - - - - - - - - 42
Recommended Test Equipment - - - - - - - - - - - - - - - - - - - - - - - - - - 42
Test Considerations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43
erformance Verification Tests - - - - - - - - - - - - - - - - - - - - - - - - - - 44
Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44
erformance Verification Tests- - - - - - - - - - - - - - - - - - - - - - - - - 44
Measurement Techniques- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45
Setup for Most Tests - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45
Electronic Load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46
Current-Monitoring Resistor - - - - - - - - - - - - - - - - - - - - - - - - - - - 46
rogramming - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46
Voltage and Current Values - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46
Constant Voltage (CV) Verifications - - - - - - - - - - - - - - - - - - - - - - 47
Constant Voltage Test Setup - - - - - - - - - - - - - - - - - - - - - - - - - - - 47
Voltage rogramming and Readback Accuracy - - - - - - - - - - - - 47
CV Load Regulation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49
CV Line Regulation- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 50
Normal Mode Voltage Noise (CV Ripple and Noise) - - - - - - - - 51
Common Mode Current Noise- - - - - - - - - - - - - - - - - - - - - - - - - - 52
Load Transient Response Time - - - - - - - - - - - - - - - - - - - - - - - - - 53

Contents
10
Chapter 3 Calibration Procedures (continued)
Constant Current (CC) Verifications - - - - - - - - - - - - - - - - - - - - - - 54
Constant Current Test Setup - - - - - - - - - - - - - - - - - - - - - - - - - - - 54
Current rogramming and Readback Accuracy - - - - - - - - - - - - 54
CC Load Regulation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 56
CC Line Regulation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57
Normal Mode Current Noise (CC Ripple and Noise) - - - - - - - - 58
erformance Test Record for Agilent E3631A - - - - - - - - - - - - - - - 59
CV erformance Test Record- - - - - - - - - - - - - - - - - - - - - - - - - - - 59
CC erformance Test Record- - - - - - - - - - - - - - - - - - - - - - - - - - - 60
Calibration Security Code - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 61
To Unsecure the ower Supply for Calibration - - - - - - - - - - - - 62
To Unsecure the ower Supply Without the Security Code - - - 64
Calibration Count - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 65
Calibration Message - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 65
General Calibration/Adjustment rocedure- - - - - - - - - - - - - - - - - 66
Aborting a Calibration in rogress - - - - - - - - - - - - - - - - - - - - - - - - 71
Calibration Record for Agilent E3631A - - - - - - - - - - - - - - - - - - - - 72
Error Messages - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 73
Calibration rogram - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 75
Chapter 4 Theory of Operation
Block Diagram Overview - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 81
AC Input and Bias Supplies- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 83
Floating Logic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 84
D-to-A Converter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 86
A-to-D Converter - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 87
ower Mesh and Control- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 88
Earth-Referenced Logic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 90
Front anel - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 90
Chapter 5 Service
Operating Checklist- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 93
Is the ower Supply Inoperative? - - - - - - - - - - - - - - - - - - - - - - - 93
Does the ower Supply Fail Self-Test? - - - - - - - - - - - - - - - - - - - 93
Types of Service Available - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 94
Standard Repair Service (worldwide) - - - - - - - - - - - - - - - - - - - - 94
Express Exchange (U.S.A. only) - - - - - - - - - - - - - - - - - - - - - - - - 94

Contents
11
Contents
Chapter 5 Service (continued)
Repacking for Shipment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 95
Electrostatic Discharge (ESD) recautions - - - - - - - - - - - - - - - - 96
Surface Mount Repair - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 96
To Replace the ower-Line Fuse - - - - - - - - - - - - - - - - - - - - - - - - - 96
Troubleshooting Hints - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 97
Unit is Inoperative - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 97
Unit Reports Errors 740 to 748 - - - - - - - - - - - - - - - - - - - - - - - - - 97
Unit Fails Self-Test- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 97
Bias Supplies roblems - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 98
Self-Test rocedures- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 99
ower-On Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 99
Complete Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 99
Chapter 6 Replaceable Parts
Replaceable arts - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 104
To Order Replaceable arts- - - - - - - - - - - - - - - - - - - - - - - - - - - 104
Backdating and arts Changes - - - - - - - - - - - - - - - - - - - - - - - - 104
E3631-60002 Top CB Assembly - - - - - - - - - - - - - - - - - - - - - - - 105
E3631-60003 VFD Assembly- - - - - - - - - - - - - - - - - - - - - - - - - - - 111
E3631-60002 Bottom CB Assembly - - - - - - - - - - - - - - - - - - - - 112
E3631-60002 Front Frame Assembly - - - - - - - - - - - - - - - - - - - - 116
E3631A ower Supply Assembly- - - - - - - - - - - - - - - - - - - - - - - 116
Manufacturer’s List - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 117
Chapter 7 Backdatin - - - - - - - - - - - - - - - - - - - - - - - - - 119
Chapter 8 Schematics
Mechanical Disassembly - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 123
E3631-60002 Component Locator - - - - - - - - - - - - - - - - - - - - - - - 124
E3631-60003 Component Locator - - - - - - - - - - - - - - - - - - - - - - - 125
E3631-60004 Component Locator - - - - - - - - - - - - - - - - - - - - - - - 126
AC Input and Bias Supplies Schematic - - - - - - - - - - - - - - - - - - - 127
Floating Logic Schematic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 128
ADC and DAC Schematic - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 129
25V ower Circuit Schematic - - - - - - - - - - - - - - - - - - - - - - - - - - - 130
+6V ower Circuit and Isolation Schematic - - - - - - - - - - - - - - - 131
Earth-Referenced Logic Schematic - - - - - - - - - - - - - - - - - - - - - - 132
Display and Keyboard Schematic - - - - - - - - - - - - - - - - - - - - - - - 133

Contents
12

1
1
Specifications

14
Specifications
The performance specifications are listed in the following pages. Specifications
are warranted in the temperature range of 0 to 40°C with a resistive load.
upplemental characteristics, which are not warranted but are descriptions of
performance determined either by design or testing. Chapter 3 "Calibration
rocedures" contains procedures for verifying the performance specifications.
All specifications apply to the three outputs unless otherwise specified.

Chapter 1 Specifications
Performance Specifications
15
1
Performance Specifications
Output Ratings (@ 0°C - 40°C)
+6V Output 0 to +6 V ; 0 to 5 A
+25V Output 0 to +25 V ; 0 to 1 A
-25V Output 0 to -25 V ; 0 to 1 A
Programming Accuracy[1] 12 months (@ 25°C ± 5°C), ±(% o output + o set)
+6V Output +25V Output -25V Output
Voltage 0.1% + 5 mV 0.05% + 20 mV 0.05% + 20 mV
Current 0.2% + 10 mA 0.15% + 4 mA 0.15% + 4 mA
Readback Accuracy[1] 12 months (over GPIB and RS-232 or ront panel with respect
to actual output @ 25°C ± 5°C), ±(% o output + o set)
+6V Output +25V Output -25V Output
Voltage 0.1% + 5 mV 0.05% + 10 mV 0.05% + 10 mV
Current 0.2% + 10 mA 0.15% + 4 mA 0.15% + 4 mA
Ripple and Noise (with outputs ungrounded, or with either output terminal grounded,
20 Hz to 20 MHz)
+6V Output +25V Output -25V Output
Voltage <0.35 mV rms <0.35 mV rms <0.35 mV rms
<2 mV p-p <2 mV p-p <2 mV p-p
Current <2 mA rms <500 mA rms <500 mA rms
Common mode current <1.5 mA rms
Load Regulation, ±(% o output + o set)
Change in output voltage or current or any load change within ratings
Voltage <0.01% + 2 mV
Current <0.01% + 250 mA
Line Regulation, ±(% o output + o set)
Change in output voltage and current or any line change within ratings
Voltage <0.01% + 2 mV
Current <0.01% + 250 mA
[1] Accuracy speci ications are a ter an 1-hour warm-up and calibration at 25°C

Chapter 1 Specifications
Performance Specifications
16
Programming Resolution
+6V Output +25V Output -25V Output
Voltage 0.5 mV 1.5 mV 1.5 mV
Current 0.5 mA 0.1 mA 0.1 mA
Readback Resolution
+6V Output +25V Output -25V Output
Voltage 0.5 mV 1.5 mV 1.5 mV
Current 0.5 mA 0.1 mA 0.1 mA
Meter Resolution
+6V Output +25V Output -25V Output
Voltage 1 mV 10 mV 10 mV
Current 1 mA 1 mA 1 mA
Transient Response Time
Less than 50 msec or output recover to within 15 mV ollowing a change in output
current rom ull load to hal load or vice versa
Command Processing Time
Programming Commands : Maximum time or output to change a ter receipt o APPLy
and SOURce commands : <50 msec
Readback Command : Maximum time to readback output by MEASure? command :
<100 msec
The Other Commands : < 50 msec
Tracking Accuracy
The ±25V outputs track each other within ± (0.2% o output + 20 mV).

Chapter 1
Specifications
Supplemental Characteristics
17
1
Supplemental Characteristics
Output Programming Range (maximum programmable values)
+6V Output +25V Output -25V Output
Voltage 0 to 6.18 V 0 to 25.75 V 0 to -25.75 V
Current 0 to 5.15 A 0 to 1.03 A 0 to 1.03 A
Temperature Coefficient, ±(% of output + offset)
Maximum change in output/readback per °C after a 30-minute warm-up
+6V Output +25V Output -25V Output
Voltage 0.01% + 2 mV 0.01% + 3 mV 0.01% + 3 mV
Current 0.02% + 3 mA 0.02% + 0.5 mA 0.02% + 0.5 mA
Stability, ±(% of output + offset)
Following a 30-minute warm-up, change in output over 8 hours under constant load,
line, and ambient temperature
+6V Output +25V Output -25V Output
Voltage 0.03% + 1 mV 0.02% + 2 mV 0.02% + 2 mV
Current 0.1% + 3 mA 0.05% + 1 mA 0.05% + 1 mA
Voltage Programming Speed
Maximum time required for output voltage to settle within 1% of its total excursion (for
resistive load). Excludes command processing time.
+6V Output +25V Output -25V Output
Full load Up 11 msec 50 msec 50 msec
Full load Down 13 msec 45 msec 45 msec
No load Up 10 msec 20 msec 20 msec
No load Down 200 msec 400 msec 400 msec
Isolation
The 0-6V supply is isolated from the ±25V supply up to ±240 Vdc. Maximum isolation
voltage from any terminal to chassis ground ±240 Vdc.
AC Input Ratings (selectable via rear panel selector)
std 115 Vac ± 10%, 47 to 63 Hz
opt 0E3 230 Vac ± 10%, 47 to 63 Hz
opt 0E9 100 Vac ± 10%, 47 to 63 Hz
Maximum Input Power
350 VA with full load

Chapter 1 Specifications
Supplemental Characteristics
18
Cooling
Fan cooled
Operating Temperature
0 to 40°C or ull rated output. At higher temperatures, the output current is derated
linearly to 50% at 55°C maximum temperature.
Output Voltage Overshoot
During turn-on or turn-o o ac power, output plus overshoot will not exceed 1 V i the
output control is set to less than 1 V. I the output control is set to 1 V or higher, there
is no overshoot.
Programming Language
SCPI (Standard Commands or Programmable Instruments)
State Storage Memory
Three (3) user-con igurable stored states
Recommended Calibration Interval
1 year
imensions*
212.6 mmW x 132.6 mmH x 348.2 mmD (8.4 x 5.2 x 13.7 in)
*See the next page for detailed information.
Weight
Net 8.2 kg (18 lb)
Shipping 11 kg (24 lb)

Chapter 1 Specifications
Supplemental Characteristics
19
1
Figure 1-1. imensions of Agilent E3631A Power Supply