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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

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

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.

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

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

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

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.

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

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