Agilent Technologies E3634A User manual

Service Guide
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The Agilent E3633A and Agilent E3634A are high performance 200 watt single-
output dual range programmable DC power supplies with both PIB 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
• PIB (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 d sables the overvoltage protect on
funct on, sets tr p voltage level, and clears the overvoltage cond t on.
4 Overcurrent protection key Enables or d sables the overcurrent protect on
funct on, sets tr p current level, and clears the overcurrent cond t on.
5 Display li it key Shows voltage and current l m t values on the d splay and
allows knob adjustment for sett ng l m t values.
6 Recall operating state key Recalls a prev ously stored operat ng state from
locat on ‘‘1’’, ‘‘2’’, or ‘‘3’’.
7 Store operating state / Local key1 Stores an operat ng state n locat on ‘‘1’’,
‘‘2’’, or ‘‘3’’ / or returns the power supply to local mode from remote nterface
mode.
8 Error / Calibrate key2 D splays error codes generated dur ng operat on, self-
test and cal brat on / or enables cal brat on mode (the power supply must be
unsecured before perform ng cal brat on). See Service Guide for more deta ls
on cal brat on.
9 I/O Configuration / Secure key3 Conf gures the power supply for remote
nterfaces / or secure or unsecure the power supply for cal brat on. See
Service Guide for more deta ls on how to secure or unsecure the power supply.
10 Output On/Off key Enables or d sables the power supply output. Th s key
toggles between on and off.
11 Control knob Increases or decreases the value of the bl nk ng d g t by turn ng
clockw se or counter clockw se.
12 Resolution selection keys Move the bl nk ng d g t to the r ght or left.
13 Voltage/current adjust selection key Selects the knob control funct on for
voltage or current adjustment.
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.
*For Agilent E3633A Model **For Agilent E3634A Model

4
Front-Panel Voltage and Current Limit Settings
You can set the voltage and current l m t values from the front panel us ng the
follow ng method.
1Select the des red range us ng the range select on keys after turn ng on the
power supply.
2Press the key to show the l m t values on the d splay.
3Move the bl nk ng d g t to the appropr ate pos t on us ng the resolut on
select on keys and change the bl nk ng d g t value to the des red voltage l m t
by turn ng the control knob. If the d splay l m t t mes out, press the key
aga n.
4Set the knob to current control mode by press ng the key.
5Move the bl nk ng d g t to the appropr ate pos t on us ng the resolut on
select on keys and change the bl nk ng d g t value to the des red current l m t
by turn ng the control knob.
6Press the key to enable the output. After about 5 seconds, the d splay
w ll go to output mon tor ng mode automat cally to d splay the voltage and
current at the output or the d splay w ll go to output mon tor ng mode
mmed ately by press ng the key aga n.
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 select on key, the resolut on select on keys,
and the control knob to change the voltage and current l m t 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 uide 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.
Replaceable Parts Chapter 6 contains a detailed parts list of the power
supply.
ackdating 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.
f you have questions 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.
f your Agilent E3633A or Agilent E3634A fails within three years 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
eneral Measurement Techniques - - - - - - - - - - - - - - - - - - - - - 50
Current-Monitoring Resistor- - - - - - - - - - - - - - - - - - - - - - - - - - 50
Programming - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 50