Agilent Technologies E3633A User manual

Service Guide
Part Number: E3634-90010
October 2007.
For Warranty information, refer to the back of the manual.
© Copyright Agilent Technologies, Inc. 1998 – 2007
All Rights Reserved.
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

2
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

3
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.
1
The key can be used as the‘‘ Local ’’ key when the power supplyis in the remote
interface mode.
2
You can enable the ‘‘calibration mode’’ by holding down this key when you
turn on the power supply.
3
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

4
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

5
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

6
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

7
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
on 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.

8

9
Contents
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