Agilent Technologies E3632A User manual

User’s Guide
Part Number: E3632-90001
April 2000.
For Safety information, Warranties, and Regulatory information,
see the pages behind the Index.
© Copyright Agilent Technologies, Inc. 2000
All Rights Reserved.
Agilent E3632A
DC Power Supply

The Agilent E3632A is a high performance 120 watt-dual range DC power
supply with PIB 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
• 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
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 E3632A
DC Power Supply

2
The Front Panel at a Glance
1 15V/7A range selection key
230V/4A range selection key
3Overvoltage protection key
4Overcurrent protection key
5Display limit key
6Recall operating state key
7Store 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 15V/7A range selection key Selects the 15V/7A range and allows the full rated output
to 15V/7A.
2 30V/4A range selection key Selects the 30V/4A range and allows the full rated output
to 30V/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 isplay 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 key1 Stores an operating state in location ‘‘1’’, ‘‘2’’, or
‘‘3’’ / or returns the power supply to local mode from remote interface mode.
8 Error / Calibrate key2 Displays 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 key3 Configures 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.
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 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 using the voltage/current adjust selection 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 E3632A 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
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.
15V Shows the 15V/7A range is selected.
30V Shows the 30V/4A range is selected.
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 Hardwareorremoteinterfacecommanderrorsaredetectedandtheerror
bit has not been cleared.
OFF The output of the power supply is disabled (See page 52 for more
information
).
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).
• 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
General Information Chapter 1 contains a general description of your power
supply. This chapter also provides instructions for checking your power
supply, connecting to ac power, and selecting power-line voltage.
Initial Operation Chapter 2 ensures that the power supply develops its rated
outputs and properly responds to operation from the front panel.
Front-Panel Operation Chapter 3 describes in detail the use of front-panel
keys and how they are used to operate the power supply from the front panel.
This chapter also shows how to configure the power supply for the remote
interface and gives a brief introduction to the calibration features.
Remote Interface Reference Chapter 4 contains reference information to help
you program the power supply over the remote interface. This chapter also
explains how to program for status reporting.
Error Messages Chapter 5 lists the error messages that may appear as you are
working with the power supply. Each listing contains information to help you
diagnose and solve the problem.
Application Programs Chapter 6 contains some remote interface applications
to help you develop programs for your application.
Tutori al Chapter 7 describes basic operation of linear power supplies and
gives specific details on the operation and use of the Agilent E3632A power
supply.
Specifications Chapter 8 lists the power supply’s specifications.
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 E3632A 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 General Information
Safety Considerations 14
Safety and EMC Requirements 14
Options and Accessories 15
Options 15
Accessories 15
Description 16
Installation 19
Initial Inspection 19
Cooling and Location 19
Input Power Requirements 22
Power-Line Cord 22
Power-Line Voltage Selection 22
Chapter 2 Initial Operation
Preliminary Checkout 27
Power-On Checkout 28
Output Checkout 29
Voltage Output Checkout 29
Current Output Checkout 30
Chapter 3 Front-Panel Operation
Front-Panel Operation Overview 35
Constant Voltage Operation 36
Constant Current Operation 38
Storing and Recalling Operating States 40
Programming Overvoltage Protection 42
Setting the OVP Level and Enable the OVP Circuit 42
Checking OVP Operation 43
Clearing the Overvoltage Condition 43
Programming Overcurrent Protection 45
Setting the OCP Level and Enable the OCP Circuit 45
Checking OCP Operation 46
Clearing the Overcurrent Condition 46
Remote Voltage Sensing 48
CV Regulation 48
Output Rating 48
Output Noise 48
Stability 49
Remote Voltage Sensing Connections 49

10
Contents
Contents
Chapter 3 Front-Panel Operation (continued)
Disabling the Output 50
Disabling the Output Using an External Relay 51
Knob Locking 51
System-Related Operations 52
Self-Test 52
Error Conditions 53
Display Control 54
Firmware Revision Query 55
SCPI Language Version 55
Remote Interface Configuration 56
Remote Interface Selection 56
PIB Address 57
Baud Rate Selection (RS-232) 57
Parity Selection (RS-232) 57
To Set the PIB Address 58
To Set the Baud Rate and Parity (RS-232) 59
PIB Interface Configuration 61
RS-232 Interface Configuration 62
RS-232 Configuration Overview 62
RS-232 Data Frame Format 62
Connection to a Computer or Terminal 63
DTR / DSR Handshake Protocol 64
RS-232 Troubleshooting 65
Calibration Overview 66
Calibration Security 66
Calibration Count 70
Calibration Message 70

11
Contents
Contents
Chapter 4 Remote Interface Reference
SCPI Command Summary 73
Simplified Programming Overview 78
Using the APPLy Command 78
Using the Low-Level Commands 78
Reading a Query Response 79
Selecting a Trigger Source 79
Power Supply Programming Ranges 80
Using the APPLy Command 81
Output Setting and Operation Commands 82
Triggering Commands 89
Trigger Source Choices 89
Triggering Commands 91
System-Related Commands 92
Calibration Commands 96
RS-232 Interface Commands 99
The SCPI Status Registers 100
What is an Event Register? 100
What is an Enable Register? 100
SCPI Status System 101
The Questionable Status Register 102
The Standard Event Register 103
The Status Byte Register 104
Using Service Request (SRQ) and Serial POLL 105
Using *STB? to Read the Status Byte 106
Using the Message Available Bit (MAV) 106
To Interrupt Your Bus Controller Using SRQ 106
To Determine When a Command Sequence is Completed 107
Using *OPC to Signal When Data is in the Output Buffer 107
Status Reporting Commands 108
An Introduction to the SCPI Language 111
Command Format Used in This Manual 112
Command Separators 113
Using the M N and MAX Parameters 113
Querying Parameter Settings 114
SCPI Command Terminators 114
IEEE-488.2 Common Commands 114
SCPI Parameter Types 115
Halting an Output in Progress 116
SCPI Conformance Information 117
IEEE-488 Conformance Information 120

12
Contents
Contents
Chapter 5 rror Messages
Execution Errors 123
Self-Test Errors 128
Calibration Errors 129
Chapter 6 Application Programs
C++ Example for PIB(IEEE 488) 133
Excel 5.0 Example for Windows 3.1 and PIB 135
Chapter 7 Tutorial
Overview of Agilent E3632A Operation 141
Output Characteristics 143
Unregulated State 145
Unwanted Signals 145
Connecting the Load 147
Output Isolation 147
Multiple Loads 147
Remote Voltage Sensing 148
Load Consideration 149
Extending the Voltage and Current Range 151
Series Connections 151
Parallel Connections 151
Remote Programming 152
Reliability 154
Chapter 8 Specifications
Performance Specifications 157
Supplemental Characteristics 159
Index 163
Declaration of Conformity 167

1
General Information

14
General Information
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Chapter 1 General Information
Options and Accessories
15
1
Options and Accessories
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Chapter 1 General Information
Description
16
Description
The Agilent E3632A DC power supply feature a combination of programming
capabilities and linear power supply performance that makes it ideal for power
systems applications. The power supply is programmable locally from the front
panel or remotely over the PIB and RS-232 interfaces. This power supply has
two ranges, allowing more voltage at a lower current. The desired output range
is selected from the front panel or over the remote interfaces.
Operational features include:
• Dual range of 15V/7A or 30V/4A
• Constant voltage (CV) or constant current (CC) operation
• Overvoltage protection (OVP) and overcurrent protection (OCP)
• Three storage locations (1 to 3) for user-defined operating states
• Automatic turn-on self-test
• Remote sensing for load voltage
• User calibration from the front panel or over the remote interfaces
The front panel operation permits:
• Easy-to-use of knob control
• Output range selection
• Enabling or disabling OVP and OCP features
• Setting the OVP and OCP trip levels
• Clearing OVP and OCP conditions
• Setting and displaying the voltage and current limit values
• Saving and recalling operating states
• Returning the power supply to local mode from remote interface mode
• Displaying remote interface error message
• Calibrating the power supply, including changing the calibration secure
code
• Configuring the power supply for remote interfaces
• Enabling or disabling the output

Chapter 1 General Information
Description
17
1
When operated over the remote interface, the power supply can be both a
listener and a talker. Using an external controller, you can instruct the power
supply to set the output and to send the status data back over the PIB or RS-
232. Capabilities include the following features:
• Voltage and current programming
• Voltage and current readback
• Present and stored status readback
• Programming syntax error detection
• Complete self-test
The front-panel VFD (Vacuum-Fluorescent Display) includes:
• Displaying actual values of output voltage and current (meter mode)
• Or displaying the limit values of voltage and current (limit mode)
• Checking the operating status from the annunciators
• Checking the type of error from the error codes (messages)
Connections to the power supply’s output and to chassis ground are made to
binding posts on the front panel
Warning Floating the power supply output more than ±60 Vdc from the chassis presents an
electric shock hazard to the operator. Do not float the outputs more than ±60 Vdc
when metal shorting bars without insulation are used to connect the ( ) output to the
( ) sense and the (-) output to the (-) sense terminals.

Chapter 1 General Information
Description
18
Warning Outputs can be floated to maximum of ±240 Vdc provided that the metal shorting bars
without insulation are either replaced with insulated conductors or they are removed
from the terminals so there is no operator access to the output conductors without
insulation. All field wiring insulation must be adequate for the voltage present.
The power supply is shipped with a detachable, 3-wire grounding type power
cord. The ac line fuse is an extractor type on the rear panel. The power supply
can be calibrated from the front panel directly or with a controller over the
PIB or RS-232 interface using calibration commands. Correction factors are
stored in non-volatile memory and are used during output programming.
Calibration from the front panel or a controller eliminate the need to remove
the top cover or even the need to remove the power supply from your system
cabi net. You can guar d against unau thorized calibration b y using the “Secured ”
calibration protection function.

Chapter 1 General Information
Installation
19
1
Installation
Initial Inspection
When you receive your power supply, inspect it for any obvious damage that
may have occurred during shipment. If any damage is found, notify the carrier
and the nearest Agilent Sales Office immediately. Warranty information is
shown in the front of this manual.
Keep the original packing materials in case the power supply has to be returned
to Agilent Technologies in the future. If you return the power supply for service,
attach a tag identifying the owner and model number. Also include a brief
description of the problem.
Mechanical Check
This check confirms that there are no broken keys or knob, that the cabinet
and panel surfaces are free of dents and scratches, and that the display is not
scratched or cracked.
Electrical Check
Chapter 2 describes an initial operation procedure which, when successfully
completed, verifies to a high level of confidence that the power supply is
operating in accordance with its specifications. Detailed electrical verification
procedures are included in the Service Guide.
Cooling and Location
Cooling
The power supply can operate without loss of performance within the
temperature range of 0 °C to 40 °C, and with derated output current from
40 °C to 55 °C. A fan cools the power supply by drawing air through the rear
panel and exhausting it out the sides. Using an Agilent rack mount will not
impede the flow of air.
Bench Operation
Your power supply must be installed in a location that allows sufficient space
at the sides and rear of the power supply for adequate air circulation. The
rubber bumpers must be removed for rack mounting.