Agilent Technologies E3633A User manual

Service Guide

Part Number: E3634-90010

October 2007.

For Warranty information, refer to the back of the manual.

Agilent E3633A and E3634A

DC Power Supplies

Agilent Technologies

The Agilent E3633A and Agilent E3634A are high performance 200 watt single-

output dual range programmable DC power supplies with both GPIB and RS-

232 interfaces. The combination of bench-top and system features in these

power supplies provides versatile solutions for your design and test

requirements.

Convenient bench-top features

• Single-output dual range

• Easy-to-use knob control settings

• Highly visible vacuum-fluorescent display meters

• High accuracy and high resolution

• Remote voltage sensing

• Overvoltage and overcurrent protection

• Output on/off

• Excellent load and line regulation and low ripple and noise

• Operating states storage

• Portable, ruggedized case with non-skid feet

• Front and Rear output terminals

• Retrieving/Scrolling error messages on the display

Flexible system features

• GPIB (IEEE-488) and RS-232 interfaces are standard

• SCPI (Standard Commands for Programmable Instruments) compatibility

• I/O setup easily done from front-panel

• Software calibration, no internal adjustments required

Agilent E3633A and E3634A

DC Power Supplies

The Front Panel at a Glance

1 8V/20A range selection key (E3633A)

25V/7A range selection key (E3634A)

220V/10A range selection key (E3633A)

50V/4A range selection key (E3634A)

3Overvoltage protection key

4Overcurrent protection key

5Display limit key

6Recall operating state key

7 Store operating state/Local key

8Error/Calibrate key

9I/O Configuration/Secure key

10 Output On/Off key

11 Control knob

12 Resolution selection keys

13 Voltage/current adjust selection key

1 8V/20A* or 25V/7A** range selection key Selects the 8V/20A or 25V/7A

range and allows the full rated output to 8V/20A or 25V/7A.

2 20V/10A* or 50V/4A** range selection key Selects the 20V/10A or

50V/4A range and allows the full rated output to 20V/10A or 50V/4A.

3 Overvoltage protection key Enables or disables the overvoltage protection

function, sets trip voltage level, and clears the overvoltage condition.

4 Overcurrent protection key Enables or disables the overcurrent protection

function, sets trip current level, and clears the overcurrent condition.

5 Display limit key Shows voltage and current limit values on the display and

allows knob adjustment for setting limit values.

6 Recall operating state key Recalls a previously stored operating state from

location ‘‘1’’, ‘‘2’’, or ‘‘3’’.

7 Store operating state / Local key1Stores an operating state in location ‘‘1’’,

‘‘2’’, or ‘‘3’’ / or returns the power supply to local mode from remote interface

mode.

8 Error / Calibrate key2Displays error codes generated during operation, self-

test and calibration / or enables calibration mode (the power supply must be

unsecured before performing calibration). See Service Guide for more details

on calibration.

9 I/O Configuration / Secure key3Configures the power supply for remote

interfaces / or secure or unsecure the power supply for calibration. See

Service Guide for more details on how to secure or unsecure the power supply.

10 Output On/Off key Enables or disables the power supply output. This key

toggles between on and off.

11 Control knob Increases or decreases the value of the blinking digit by turning

clockwise or counter clockwise.

12 Resolution selection keys Move the blinking digit to the right or left.

13 Voltage/current adjust selection key Selects the knob control function for

voltage or current adjustment.

The key can be used as the‘‘

Local

’’ key when the power supplyis in the remote

interface mode.

You can enable the ‘‘calibration mode’’ by holding down this key when you

turn on the power supply.

You can use it as the ‘‘

Secure

’’ or ‘‘

Unsecure

’’ key when the power supply is

in the calibration mode.

*For Agilent E3633A Model **For Agilent E3634A Model

Front-Panel Voltage and Current Limit Settings

You can set the voltage and current limit values from the front panel using the

following method.

1Select the desired range using the range selection keys after turning on the

power supply.

2Press the

key to show the limit values on the display.

3Move the blinking digit to the appropriate position using the resolution

selection keys and change the blinking digit value to the desired voltage limit

by turning the control knob. If the display limit times out, press the key

again.

4Set the knob to current control mode by pressing the key.

5Move the blinking digit to the appropriate position using the resolution

selection keys and change the blinking digit value to the desired current limit

by turning the control knob.

6Press the

key to enable the output. After about 5 seconds, the display

will go to output monitoring mode automatically to display the voltage and

current at the output or the display will go to output monitoring mode

immediately by pressing the

key again.

Note All front panel keys and controls can be disabled with remote interface commands.

The Agilent E3633A and Agilent E3634A 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 voltage and current limit values.

Display

Limit

Display

Limit

Voltage

Current

Output

On/Off

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.

8V Shows the 8V/20A range is selected. (Agilent E3633A model)

20V Shows the 20V/10A range is selected. (Agilent E3633A model)

25V Shows the 25V/7A range is selected. (Agilent E3634A model)

50V Shows the 50V/4A range is selected. (Agilent E3634A model)

OVP The overvoltage protection function is enabled when the

annunciator turns on or the overvoltage protection circuit has

caused the power supply to shutdown when the annunciator blinks.

OCP The overcurrent protection function is enabled when the

annunciator turns on or the overcurrent protection circuit has

caused the power supply to shutdown when the annunciator blinks.

CAL The power supply is in calibration mode.

Limit The display shows the limit values of voltage and current.

ERROR Hardware or remote interface command errors are detected and

the error bit has not been cleared.

OFF The output of the power supply is disabled (For more information,

see page 52 in the User’s Guide).

Unreg The output of the power supply is unregulated (output is neither CV

nor CC).

CV The power supply is in constant voltage mode.

CC The power supply is in constant current mode.

To review the display annunciators, hold down key as 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 in User’s Guide).

• Set the GPIB bus address (see chapter 3 in User’s Guide).

• Set the RS-232 baud rate and parity (see chapter 3 in User’s Guide).

1Power-line voltage setting

2Power-line fuse-holder assembly

3AC inlet

4Power-line module

5GPIB (IEEE-488) interface connector

6RS-232 interface connector

7Rear output terminals

I/O

Config

In This Book

This is the Service Guide for your Agilent E3633A and E3634A DC power

supplies. Unless otherwise stated, the information in this manual applies to

both two models.

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.

Schematics

Chapter 6 contains the power supply’s component locator

drawings.

If you have questions relating to the operation of the power supply, call

1-800-829-4444 in the United States, or contact your nearest Agilent

Technologies Sales Office.

If your Agilent E3633A or Agilent E3634A fails within

e year of purchase,

Agilent will repair or replace it free of charge. Call 1-800-258-5165 ("Express

Exchange") in the United States, or contact your nearest Agilent Technologies

Sales Office.

Contents

Chapter 1 Specifications

Performance Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

Supplemental Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - 13

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 - - - - - - - - - - 26

To Use the Power Supply in Constant Voltage Mode - - - - - - - - - 28

To Use the Power Supply in Constant Current Mode - - - - - - - - - 30

To Store and Recall the Instrument State - - - - - - - - - - - - - - - - - - 32

To Program Overvoltage Protection - - - - - - - - - - - - - - - - - - - - - - 34

Setting the OVP Level and Enable the OVP Circuit - - - - - - - - 34

Checking OVP Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - 35

Clearing the Overvoltage Condition - - - - - - - - - - - - - - - - - - - - 35

To Program Overcurrent Protection - - - - - - - - - - - - - - - - - - - - - - 37

Setting the OCP Level and Enable the OCP Circuit- - - - - - - - 37

Checking OCP Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - 38

Clearing the Overcurrent Condition- - - - - - - - - - - - - - - - - - - - 38

To Rack Mount the Power Supply - - - - - - - - - - - - - - - - - - - - - - - - 40

Chapter 3 Calibration Procedures

Agilent Technologies Calibration Services - - - - - - - - - - - - - - - - - 45

Calibration Interval- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45

Automating Calibration Procedures - - - - - - - - - - - - - - - - - - - - - - 46

Test Considerations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46

Recommended Test Equipment- - - - - - - - - - - - - - - - - - - - - - - - - - 47

Performance Verification Tests - - - - - - - - - - - - - - - - - - - - - - - - - - 48

Self-Test- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 48

Performance Verification Tests - - - - - - - - - - - - - - - - - - - - - - - 48

Measurement Techniques- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

Setup for Most Tests - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

Electronic Load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

General Measurement Techniques - - - - - - - - - - - - - - - - - - - - - 50

Current-Monitoring Resistor- - - - - - - - - - - - - - - - - - - - - - - - - - 50

Programming- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 50

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