Keysight E3632A User Manual

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Keysight E3632A  DC Power Supply

User’s Guide

Notices

CAUTION

WARNING

No p art o f this manu al may be re produce d in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Keysight Technologies as governed by United States and international copyright laws.

Manual Part Number

E3632-90001

Edition

Edition 7, November 2014

Keysight Technologies 1400 Fountaingrove Parkway  Santa Rosa, CA 95403

Warranty

The material contained in this document is provided “as is,” and is subject to change, without notice, in future editions. Further, to the maximum extent permitted by the applicable law, Keysight disclaims all warranties, either express or implied, with regard to this manual and any information contained herein, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Keysight shall not be liable for errors or for incidental or consequential damages in connection with the furnishing, use, or performance of this document or of any information contained herein. Should Keysight and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms, the warranty terms in the separate agreement shall control.

Technology Licenses

The hardware and or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license.

Restricted Rights Legend

U.S. Government Restricted Rights. Software and technical data rights granted to the federal government include only those rights customarily provided to end user customers. Keysight provides this customary commercial license in Software and technical data pursuant to FAR 12.211 (Technical Data) and 12.212 (Computer Software) and, for the Department of Defense, DFARS

252.227-7015 (Technical Data - Commercial Items) and DFARS 227.7202-3 (Rights in Commercial Computer Software or Computer Software Documentation).

Safety Notices

A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the likes of that, if not correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met.

A WARNING notice denotes a hazard. It calls attention to an operating procedure, practice, or the likes of that, if not correctly performed or adhered to, could result in personal injury or death. Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.

II E3632A User’s Guide

Safety Symbols

The following symbols on the instrument and in the documentation indicate precautions which must be taken to maintain safe operation of the instrument.

Caution, risk of danger (refer to this manual for specific Warning or Caution information)

DC (Direct current or voltage)

AC (Alternating current or voltage) Positive binding post

Protective conductor terminal Negative binding post

Out position of a bi-stable push control Earth (ground) terminal

In position of a bi-stable push control

Terminal is at earth potential. Used for measurement and control circuits designed to be operated with one terminal at earth potential.

E3632A User’s Guide III

Safety Considerations

CAUTION

Read the information below before using this instrument.

The following general safety precautions must be observed during all phases of operation, service, and repair of this instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards for design, manufacture, and intended use of the instrument. Keysight Technologies assumes no liability for the customer’s failure to comply with these requirements.

• Use the device with the cables provided with the shipment.

• If the device is used in a manner not specified by the manufacturer,

the device protection may be impaired.

• Always use a dry cloth to clean the device. Do not use ethyl alcohol or any other volatile liquid to clean the device.

• Do not permit any blockage of the ventilation holes of the device.

IV E3632A User’s Guide

WARNING

• Do not use MAINS supply cords by inadequately RATED cord. Always use the MAINS supply cord provided by the manufacturer.

• Do not use the device if it appears damaged or defective. REMOVE POWER and do not use the device until safe operation is verified by service-trained personnel. If necessary, return the device to Keysight for service and repair to ensure that the safety features are maintained.

• Do not operate the device around flammable gases or fumes, vapor, or wet environments.

• Observe all markings on the device before connecting any wiring to the device.

• Turn off the output of the power supply before connecting to the output terminals.

• When servicing the device, use only the specified replacement parts.

• Do not install substitute parts or perform any unauthorized modification to the device. Return the device to Keysight for service and repair to ensure that the safety features are maintained.

• Do not operate the device with the cover removed or loosened.

E3632A User’s Guide V

This power supply is a Safety Class I instrument, which means that it has a protective earth terminal. This terminal must be connected to earth ground through a power source with a 3-wire ground receptacle.

Before installation or operation, check the power supply and review this manual for safety markings and instructions. Safety information for specific procedures is located at the appropriate places in this manual.

Safety and EMC Requirements

This power supply is designed to comply with the following safety and Electromagnetic Compatibility (EMC) requirements:

• IEC61326-1:2005/EN61326-1:2006

• Canada: ICES/NMB-001: Issue 4, June 2006

• Australia/New Zealand: AS/NZS CISPR11:2004

• IEC 61010-1:2001/EN 61010-1:2001

• Canada: CAN/CSA-C22.2 No. 61010-1-04

• USA: ANSI/UL 61010-1:2004

Environmental Conditions

This instrument is designed for indoor use and in an area with low condensation. The table below shows the general environmental requirements for this instrument.

Environmental condition Requirements

Te m p e r a t u r e

Operating condition

• 0 °C to 40 °C (full rated output) Storage condition

• –20 °C to 70 °C

Humidity Up to 80% RH

Altitude Up to 2000 m

Installation category II (for indoor use)

Pollution degree 2

VI E3632A User’s Guide

Regulatory Markings

The CE mark is a registered trademark of the European Community. This CE mark shows that the product complies with all the relevant European Legal Directives.

The C-tick mark is a registered trademark of the Spectrum Management Agency of Australia. This signifies compliance with the Australia EMC Framework regulations under the terms of the Radio Communication Act of 1992.

ICES/NMB-001 indicates that this ISM device complies with the Canadian ICES-001. Cet appareil ISM est confomre a la norme NMB-001 du Canada.

The CSA mark is a registered trademark of the Canadian Standards Association.

This symbol is a South Korean Class A EMC Declaration. This is a Class A instrument suitable for professional use and in electromagnetic environment outside of the home.

This instrument complies with the WEEE Directive (2002/96/EC) marking requirement. This affixed product label indicates that you must not discard this electrical or electronic product in domestic household waste.

This symbol indicates the time period during which no hazardous or toxic substance elements are expected to leak or deteriorate during normal use. Forty years is the expected useful life of the product.

E3632A User’s Guide VII

Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/EC

Product Category:

With reference to the equipment types in the WEEE directive Annex 1, this instrument is classified as a “Monitoring and Control Instrument” product.

The affixed product label is as shown below.

Do not dispose in domestic household waste.

To return this unwanted instrument, contact your nearest Keysight Service Center, or visit

www.keysight.com/environment/product

for more information.

VIII E3632A User’s Guide

Declaration of Conformity (DoC)

NOTE

The Declaration of Conformity (DoC) for this instrument is available on the Keysight Web site. You can search the DoC by its product model or description at the Web address below.

http://www.keysight.com/go/conformity

If you are unable to search for the respective DoC, contact your local Keysight representative.

E3632A User’s Guide IX

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X E3632A User’s Guide

1 Getting Started

Introduction 2

Standard Shipped Items 7

Options 7 Accessories 8

Preparing the Power Supply 9

Preliminary checkout 9 Power-on checkout 10 Checking the output 11 Input power requirements 13 Rack-mount the power supply 16

Product at a Glance 18

Front panel 18 Rear panel 21 Display annunciators 22

Operating the Power Supply 24

Cooling 24 Bench operation 24 Cleaning 24

2 Operation and Features

Overview 26

Constant Voltage Operation 28

Front panel operation 28 Remote interface operation 30

Constant Current Operation 30

Front panel operation 30 Remote interface operation 32

E3632A User’s Guide XI

Storing and Recalling Operating States 33

Front panel operation 33 Remote interface operation 35

Programming the Overvoltage Protection 35

Front panel operation 35 Remote interface operation 37

Programming the Overcurrent Protection 38

Front panel operation 38 Remote interface operation 40

Remote Voltage Sensing 41

CV regulation 41 Output rating 42 Output noise 42 Stability 42 Remote voltage sensing connections 43

Disabling the Output 44

Front panel operation 44 Remote interface operation 44 Disconnecting the output using an external relay 45 Knob locking 45

System-Related Operations 46

Self-test 46 Error conditions 47 Display control 48 Firmware revision query 49 SCPI language version 49

Remote Interface Configuration 51

Remote interface selection 51 GPIB address 52 Baud rate selection (RS-232) 52

XII E3632A User’s Guide

Parity selection (RS-232) 53 To set the GPIB address 53 To set the baud rate and parity (RS-232) 54

GPIB Interface Configuration 56

RS-232 Interface Configuration 57

RS-232 configuration overview 57 RS-232 data frame format 58 Connection to a computer or terminal 58 DTR/DSR handshake protocol 60 RS-232 troubleshooting 62

Calibration 63

Calibration security 63 To unsecure for calibration 64 To secure against calibration 65 To change the security code 66 Calibration count 67 Calibration message 68

3 Remote Interface Reference

SCPI Command Summary 70

Introduction to the SCPI Language 74

Command format used in this manual 75 Command separators 76 Using the MIN and MAX parameters 77 Querying parameter settings 77 SCPI command terminators 78 IEEE-488.2 common commands 78 SCPI parameter types 78

Simplified Programming Overview 80

Using the APPLy command 80 Using the low-level commands 80

E3632A User’s Guide XIII

Reading a query response 81 Selecting a trigger source 81 Power supply programming ranges 82

Using the APPLy Command 83

APPLy {<voltage>| DEF | MIN | MAX}[,{<current>| DEF | MIN

| MAX}] 83

APPLy? 84

Output Settings and Operation Commands 85

Triggering Commands 93

Trigger source choices 93 Triggering commands 95

System-Related Commands 96

Calibration Commands 102

RS-232 Interface Commands 106

SCPI Status Registers 107

What is an event register? 107 What is an enable register? 107 SCPI status system 108 The Questionable Status register 109 The Standard Event register 110 The Status Byte register 112 Using Service Request (SRQ) and Serial POLL 113 Using *STB? to read the Status Byte 114 Using the Message Available Bit (MAV) 114 To interrupt your bus controller using SRQ 115 To determine when a command sequence is completed 115 Using *OPC to signal when data is in the output buffer 116

Status Reporting Commands 117

Halting an Output in Progress 121

XIV E3632A User’s Guide

SCPI Conformance Information 122

SCPI confirmed commands 122 Device-specific commands 124

IEEE-488 Conformance Information 125

Dedicated hardware lines 125 Addressed commands 125 IEEE-488.2 common commands 126

4 Error Messages

Overview 128

Front panel operation 128 Remote interface operation 129

Execution Error Messages 130

Self-Test Error Messages 135

Calibration Error Messages 137

5 Application Programs

Overview 140

Example Program for C++ (GPIB IEEE 488) 141

Example Program for Excel 5.0 (Windows 3.1 and GPIB) 144

6 Tutorial

Overview of the Power Supply Operation 150

Output Characteristics 152

Unregulated state 154 Unwanted signals 154

Connecting the Load 157

Output isolation 157 Multiple loads 157

E3632A User’s Guide XV

Remote voltage sensing 158 Load consideration 159

Extending the Voltage Range and Current Range 162

Series connections 162 Parallel connections 163

Remote Programming 164

Reliability 166

7 Characteristics and Specifications

Physical Characteristics 168

Environmental Characteristics 169

Electrical Specifications 169

Supplemental Characteristics 171

XVI E3632A User’s Guide

List of Figures

Figure 1-1 Shorting conductors without insulation 5 Figure 1-2 Front panel 18 Figure 1-3 Voltage and current limit settings 20 Figure 1-4 Rear panel 21 Figure 1-5 Display annunciators 22 Figure 2-1 Recommended protection circuit for battery

charging 38 Figure 2-2 Remote voltage sensing connections 43 Figure 2-3 RS-232 data frame format 58 Figure 2-4 DB-9 serial connection 59 Figure 2-5 DB-25 serial connection 60 Figure 3-1 SCPI status system 108 Figure 6-1 Diagram of a simple series power supply with tap

selection 150 Figure 6-2 Block diagram of the power supply showing the remote

interface isolation 151 Figure 6-3 Ideal constant voltage power supply 152 Figure 6-4 Ideal constant current power supply 152 Figure 6-5 Output characteristics 153 Figure 6-6 Simplified diagram of the common mode and normal

mode sources of noise 156 Figure 6-7 Regulated power supply with remote sensing 159 Figure 6-8 Speed of response — programming up (full load) 164 Figure 6-9 Speed of response — programming down 165 Figure 7-1 E3632A dimensions 168

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XVIII E3632A User’s Guide

List of Tables

Table 1-1 E3632A options 7 Table 1-2 E3632A accessories 8 Table 1-3 Front panel overview 18 Table 1-4 Rear panel overview 21 Table 1-5 Display annunciators overview 22 Table 3-1 SCPI command summary 71 Table 3-2 Keysight E3632A programming ranges 82 Table 3-3 Power supply state 99 Table 3-4 Bit definitions — Questionable Status register 109 Table 3-5 Bit definitions — Standard Event register 110 Table 3-6 Bit definitions — Status Byte summary register 112 Table 3-7 SCPI confirmed commands 122 Table 3-8 Non-SCPI commands 124 Table 4-1 Execution error messages 130 Table 4-2 Self-test error messages 135 Table 4-3 Calibration error messages 137 Table 6-1 Wire rating 158 Table 6-2 Slew rate 160 Table 7-1 Physical characteristics 168 Table 7-2 Electrical specifications 169 Table 7-3 Supplemental characteristics 171

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XX E3632A User’s Guide

E3632A DC Power Supply User’s Guide

1 Getting Started

Introduction 2 Standard Shipped Items 7 Preparing the Power Supply 9 Product at a Glance 18 Operating the Power Supply 24

This chapter guides you to set up your power supply for the first time. An introduction to all the features of the power supply is also given.

1Getting Started 

Introduction

The Keysight E3632A is a high performance 120 W dual range DC power supply with GPIB 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- f luorescent 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

• 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

2 E3632A User’s Guide

Getting Started 1

Introduction

The E3632A DC power supply features 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 GPIB 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

• Dual range of 15 V/7 A or 30 V/4 A

• 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 power- on self- test

• Remote sensing for load voltage

• User calibration from the front panel or via the remote

interfaces

Front panel operations

• Easy- to- use 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 security code

E3632A User’s Guide 3

1Getting Started 

WARNING

Introduction

• Configuring the power supply for remote interfaces

• Enabling or disabling the output

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 GPIB or RS- 232 interfaces. 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 Vacuum- Fluorescent Display (VFD) 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)

4 E3632A User’s Guide

Connections to the power supply’s output and to chassis ground are made to binding posts on the front panel.

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.

Getting Started 1

WARNING

Introduction

Figure 1-1 Shorting conductors without insulation

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.

E3632A User’s Guide 5

1Getting Started 

Introduction

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 GPIB 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 eliminates the need to remove the top cover or even the need to remove the power supply from your system cabinet. You can guard against unauthorized calibration by using the “Secured” calibration protection function.

6 E3632A User’s Guide

Standard Shipped Items

Verify that you have received the following items in the shipment of your power supply. If anything is missing or damaged, contact your nearest Keysight Sales Office.

✔ Power cord

✔ Certificate of Calibration

✔ E3632A User’s Guide (this manual)

✔ E3632A Service Guide (E3632- 90010)

Options

Options 0EM, 0E3, and 0E9 determine which power-line voltage is selected at the factory. The standard unit is configured for 115 Vac ±10%, 47 Hz to 63 Hz input voltage.

Getting Started 1

Standard Shipped Items

For more information about changing the power- line voltage setting, refer to

Tab l e 1 - 1 E3632A options

Option Description

OEM 115 Vac 10%, 47 Hz to 63 Hz input voltage

OE3 230 Vac 10%, 47 Hz to 63 Hz input voltage

OE9 100 Vac 10%, 47 Hz to 63 Hz input voltage

1CM Rack-mount kit (Keysight part number 5063-9243)

OL2 Extra English manual set (local language manual files are included in the

CD-ROM, Keysight part number 5964-8251)

E3632A User’s Guide 7

“Power- line voltage selection” on page 14.

1Getting Started 

Standard Shipped Items

Accessories

The accessories listed below may be ordered from your local Keysight Sales Office either with the power supply or separately.

Tab l e 1 - 2 E3632A accessories

Part number Description

10833A GPIB cable, 1 m (3.3 ft.)

10833B GPIB cable, 2 m (6.6 ft.)

34398A • RS-232, 9 pin (f) to 9 pin (f), 2.5 m (8.2 ft.) cable

• 9 pin (f) to 25 pin (m) adapter

8 E3632A User’s Guide

Preparing the Power Supply

NOTE

Preliminary checkout

1 Verify the power- line voltage setting on the rear panel.

The power- line voltage is set to the proper value for your country when the power supply is shipped from the factory. Change the voltage setting if it is not correct. The settings are 100 Vac, 115 Vac, or 230 Vac.

2 Verify that the correct power- line fuse is installed.

The correct fuse is installed for your country when the power supply is shipped from the factory. For 100 Vac or 115 Vac operation, you must use a 4 AT fuse. For 230 Vac operation, you must use a 2.5 AT fuse.

3 Connect the power- line cord and turn on your power

supply.

The front- panel display will light up and a power- on self- test occurs automatically when you turn on the power supply.

Getting Started 1

Preparing the Power Supply

• Refer to “Power-line voltage selection” on page 14 if you need to

change the power-line voltage or the power-line fuse.

• To replace the 4 AT fuse, order Keysight part number 2110-0996.

• To replace the 2.5 AT fuse, order Keysight part number 2110-0999.

E3632A User’s Guide 9

1Getting Started 

Display Limit

NOTE

Output On/Off

Preparing the Power Supply

Power-on checkout

The power- on test includes an automatic self- test that checks the internal microprocessors and allows the user visually check the display. You will observe the following sequence on the display after pressing the front panel power switch to on.

1 All segments of the display including all annunciators will

turn on for about one second.

To review the annunciators, hold down as you turn on the power supply.

2 The GPIB address or RS- 232 message will then be displayed

for about one second.

ADDR 5 (or RS-232)

The GPIB address is set to “5” when the power supply is shipped from the factory for remote interface configuration. If this is not the first time the power supply is turned on, a different interface (RS- 232) or a different GPIB address may appear.

10 E3632A User’s Guide

Refer to Chapter 3, “Remote Interface Reference” if you need to change the remote interface configuration.

3 The 15V, OVP, OCP, and OFF annunciators are on. All others

are off.

The power supply will go into the power- on/reset state, the output is disabled (the OFF annunciator turns on), the 15 V/7 A range is selected (the 15V annunciator turns on), and the knob is selected for voltage control. Notice that the OVP and OCP annunciator also turn on.

4 Enable the outputs.

Press to enable the output. The OFF annunciator turns off and the 15V, OVP, OCP, and CV annunciators are lit. The blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. Meter mode means that the display shows the actual output voltage and current.

NOTE

If the power supply detects an error during power-on self-test, the ERROR

NOTE

Power

Output On/Off

annunciator will turn on. Refer to Chapter 4, “Error Messages”.

Checking the output

The following procedures check to ensure that the power supply develops its rated outputs and properly responds to operation from the front panel. For complete performance and verification tests, refer to the Service Guide (E3632- 90010).

For each step, use the keys shown on the left margins.

Voltage output check

The following steps verify the basic voltage functions with  no load.

1 Turn on the power supply.

2 Enable the outputs.

The OFF annunciator turns off and the 15V, OVP, OCP, and CV annunciators are lit. The blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. Meter mode means that the display shows the actual output voltage and current.

Getting Started 1

Preparing the Power Supply

E3632A User’s Guide 11

1Getting Started 

Power

Output On/Off

Display Limit

Preparing the Power Supply

3 Check that the front- panel voltmeter properly responds to

knob control for the 15 V/7 A range.

Turn the knob clockwise or counter- clockwise to check that the voltmeter responds to knob control and the ammeter indicates nearly zero.

4 Ensure that the voltage can be adjusted from zero to the full

rated value .

[1]

Adjust the knob until the voltmeter indicates 0 V, and then adjust the knob until the voltmeter indicates 15.0 V.

Current output check

The following steps check the basic current functions with a short across the power supply’s output.

1 Turn on the power supply.

2 Connect a short across the (+) and (–) output terminals with

an insulated test lead.

3 Enable the output.

The OFF annunciator turns off and the 15V, OVP, and OCP annunciators are lit. The CV or CC annunciator turns on depending on the resistance of the test lead. The blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. Meter mode means that the display shows the actual output voltage and current.

4 Adjust the voltage limit value to 1.0 V.

Set the display to the limit mode (the Limit annunciator will be flashing). Adjust the voltage limit to 1.0 V to assure CC operation. The CC annunciator will turn on.

12 E3632A User’s Guide

[1] You can use the resolution selection keys to move the flashing digit to the right

or left when setting the voltage.

5 Check that the front- panel ammeter properly responds to

Volt/Curr

NOTE

knob control for the 15 V/7 A range.

Set the knob to the current control, and turn the knob clockwise or counter- clockwise when the display is in the meter mode (the Limit annunciator is off). Check that the ammeter responds to knob control and the voltmeter indicates nearly zero (the voltmeter will show the voltage drop caused by the test lead).

6 Ensure that the current can be adjusted from zero to the full

rated value.

If an error has been detected during the output checkout procedures, the

If an error has been detected during the output checkout procedures, the ERROR annunciator will turn

on. See "Error Messages" for more information starting on page 121 in ch apter 5.

ERROR annunciator will turn on. Refer to Chapter 4, “Error Messages”.

Input power requirements

You can operate your power supply from a nominal 100 V, 115 V, or 230 V single phase AC power source at 47 Hz to 63 Hz. An indication on the rear panel shows the nominal input voltage set for the power supply at the factory. If necessary, you can change the power- line voltage setting according to the instructions as shown in

selection” on page 14.

Getting Started 1

Preparing the Power Supply

[1]



“Power-line voltage

Power-line cord

The power supply is shipped from the factory with a power- line cord that has a plug appropriate for your location. Contact the nearest Keysight Sales and Service Office if the wrong power- line cord is included with your power supply. Your power supply is equipped with a 3- wire grounding type power cord where the third conductor is the ground. The power supply is grounded only when the power- line cord is plugged into an appropriate receptacle. Do not operate your power supply without adequate cabinet ground connection.

[1] You can use the resolution selection keys to move the flashing digit to the right

or left when setting the current.

E3632A User’s Guide 13

1Getting Started 

100 Vac or 115 Vac, 4 AT fuse 230 Vac, 2.5 AT fuse

Power-line voltage selector

Preparing the Power Supply

Power-line voltage selection

Power- line voltage selection is accomplished by adjusting two components — power- line voltage selector and power- line fuse on the power-line module of the rear panel. To change the power- line voltage, proceed as follows:

1 Remove the power cord.

Remove the fuse- holder assembly with a flat- blade screwdriver from the rear panel.

14 E3632A User’s Guide

2 Install the correct line fuse.

Remove the power- line voltage selector from the power- line module.

Getting Started 1

100 Vac, 115 Vac, or 230 Vac

NOTE

Preparing the Power Supply

3 Rotate the power-line voltage selector until the correct

voltage appears.

4 Replace the power- line voltage selector and the

fuse- holder assembly in the rear panel.

E3632A User’s Guide 15

Verify that the correct line voltage is selected and the power-line fuse  is good.

1Getting Started 

Front Rear (bottom view)

Preparing the Power Supply

Rack-mount the power supply

The power supply can be mounted in a standard 19- inch rack cabinet using one of three optional kits available. A rack- mounting kit for a single instrument is available as Option 1CM (5063- 9243). Installation instructions and hardware are included with each rack- mounting kit. Any Keysight System II instrument of the same size can be rack- mounted beside the Keysight E3632A power supply.

1 Remove the front and rear bumpers before rack- mounting

the power supply.

2 To rack-mount a single instrument, order the adapter kit

(5063- 9243).

16 E3632A User’s Guide

Getting Started 1

Preparing the Power Supply

3 To rack-mount two instruments of the same depth

side- by- side, order the lock- link kit (5061- 9694) and rack- mount kit (5063- 9212).

4 To install two instruments in a sliding support shelf,

order the support shelf (5063- 9256) and the slide kit (1494- 0015).

E3632A User’s Guide 17

1Getting Started 

Product at a Glance

Front panel

Figure 1-2 Front panel

Tab l e 1 - 3 Front panel overview

No Item Description

1 15 V/7 A range selection key Select the 15 V/7 A range and allow the full rated output to 15 V/7 A.

2 30 V/4 A range selection key Select the 30 V/4 A range and allow the full rated output to 30 V/4 A.

18 E3632A User’s Guide

Getting Started 1

Product at a Glance

Tab l e 1 - 3 Front panel overview (continued)

No Item Description

3 Overvoltage protection key Enable or disable the overvoltage protection function, set the trip

voltage level, and clear the overvoltage condition.

4 Overcurrent protection key Enable or disable the overcurrent protection function, set the trip

current level, and clear the overcurrent condition.

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

the knob adjustment for setting the limit values.

6 Recall operating state key Recall a previously stored operating state from location 1, 2, or 3.

7 Store operating state/Local key

8 Error/Calibrate key

[2]

9 I/O Configuration/Secure key

[1]

[3]

Store an operating state in location 1, 2, or 3 or return the power supply to the local mode from the remote interface mode.

Display the error codes generated during operation, self-test, and calibration or enable the calibration mode (the power supply must be unsecured before performing calibration). Refer to the Service Guide (E3632-90010) for more details on calibration.

Configure the power supply for remote interfaces, or secure or unsecure the power supply for calibration. Refer to the Service Guide (E3632-90010) for more details on how to secure or unsecure the power supply.

10 Output On/Off key Enable or disable the power supply output. This key toggles between

on and off.

11 Control knob Increase or decrease the value of the flashing digit by turning

clockwise or counter-clockwise.

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

13 Voltage/Current adjust selection key Select the knob control function for voltage or current adjustment.

[1] The key can be used as the Local key when the power supply is 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.

E3632A User’s Guide 19

1Getting Started 

Display Limit

Output On/Off

Display Limit

NOTE

Product at a Glance

Voltage and current limit settings

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

Figure 1-3 Voltage and current limit settings

1 Select the desired range using the range selection keys

after turning on the power supply.

2 Press to show the limit values on the

display.

3 Move 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 again.

4 Set the knob to current control mode using the

voltage/current adjust selection key.

5 Move 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.

6 Press to enable the output. After about

five 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

again.

20 E3632A User’s Guide

All the front panel keys and controls can be disabled with the remote interface commands. The power supply must be in the Local mode for the front panel keys and controls to function.

Rear panel

Getting Started 1

Product at a Glance

Figure 1-4 Rear panel

Tab l e 1 - 4 Rear panel overview

No Description

1 Power-line voltage setting

2 Power-line fuse-holder assembly

3 AC inlet

4 Power-line module

5 GPIB (IEEE-488) interface connector

6 RS-232 interface connector

E3632A User’s Guide 21

1Getting Started 

NOTE

I/O Config

Product at a Glance

Use the front-panel key to:

• Select the GPIB or RS-232 interface (see Chapter 2).

• Set the GPIB bus address (see Chapter 2).

• Set the RS-232 baud rate and parity (see Chapter 2).

Display annunciators

Figure 1-5 Display annunciators

Tab l e 1 - 5 Display annunciators overview

Item Description

Adrs The power supply is addressed to listen or talk over a remote interface.

Rmt The power supply is in the remote interface mode.

15 V Shows the 15 V/7 A range is selected.

30 V Shows the 30 V/4 A 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 shut down when the annunciator flashes.

OCP The overcurrent protection function is enabled when the annunciator turns on or the overcurrent

protection circuit has caused the power supply to shut down when the annunciator flashes.

CAL The power supply is in the calibration mode.

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

22 E3632A User’s Guide

Getting Started 1

NOTE

Display Limit

Product at a Glance

Tab l e 1 - 5 Display annunciators overview (continued)

Item Description

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. Refer to “System-Related Operations” on page 46 for more

information.

Unreg The output of the power supply is unregulated (output is neither CV nor CC).

CV The power supply is in the constant voltage mode.

CC The power supply is in the constant current mode.

To review the display annunciators, hold down as you turn on the power supply.

E3632A User’s Guide 23

1Getting Started 

Operating the Power Supply

Cooling

The power supply can operate at the rated specifications within the temperature range of 0 C to 40 C. A fan cools the power supply by drawing air through the sides and exhausting it out the back. Using a Keysight 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.

Cleaning

No cleaning is required for this product. If you wish to remove dust from the enclosure, use a dry cloth.

24 E3632A User’s Guide

E3632A DC Power Supply User’s Guide

2 Operation and Features

Overview 26 Constant Voltage Operation 28 Constant Current Operation 30 Storing and Recalling Operating States 33 Programming the Overvoltage Protection 35 Programming the Overcurrent Protection 38 Remote Voltage Sensing 41 Disabling the Output 44 System-Related Operations 46 Remote Interface Configuration 51 GPIB Interface Configuration 56 RS-232 Interface Configuration 57 Calibration 63

This chapter describes the operations and features for the E3632A DC power supply.

2 Operation and Features 

Local

Display Limit

Output On/Off

Overview

The following section describes an overview of the front panel keys before operating your power supply.

• The power supply is shipped from the factory configured

in the front panel operation mode. At power- on, the power supply is automatically set to operate in the front panel operation mode. When in this mode, the front panel keys can be used. When the power supply is in remote operation mode, you can return to front panel operation mode at any time by pressing previously send the front panel lockout command. A change between front panel and remote operation modes will not result in a change in the output parameters.

• The power supply has two output ranges of 15 V/7 A or

30 V/4 A. This feature allows more voltage at a lower current or more current at a lower voltage. The desired output range is selected from the front panel or over the remote interfaces. The 15V or 30V annunciator indicates the presently selected range.

• When you press (the Limit annunciator

flashes), the display of the power supply goes to the limit mode and the present limit values will be displayed. In this mode, you can also observe the change of the limit values when adjusting the knob. If you press

again or let the display time- out after

several seconds, the power supply will return the display to the meter mode (the Limit annunciator turns off). In this mode, the actual output voltage and current will be displayed.

• The output of the power supply can be enabled or

disabled from the front panel using the output is off, the OFF annunciator turns on and the output is disabled.

if you did not

. When

26 E3632A User’s Guide

Operation and Features 2

Overview

• The display provides the present operating status of the

power supply with annunciators and also informs the user of error codes. For example, the power supply is operating in CV mode in the 15 V/7 A range and controlled from the front panel, then the CV and 15V annunciators will turn on. If, however, the power supply is remotely controlled, the Rmt annunciator will also turn on, and when the power supply is being addressed over GPIB interface, the Adrs annunciator will turn on. Refer to

“Display annunciators” on page 22 for more information.

E3632A User’s Guide 27

2 Operation and Features 

Power

30V,4A

Display Limit

NOTE

Constant Voltage Operation

To set up the power supply for constant voltage (CV) operation, proceed as follows.

Front panel operation

1 Connect a load to the output terminals.

With power- off, connect a load to the (+) and (–) output terminals.

2 Turn on the power supply.

To operate the power supply in the 30 V/4 A range, press

before proceeding to the next step. The 30V

annunciator turns on.

3 Set the display to the limit mode.

Notice that the Limit annunciator flashes, indicating that the display is in the limit mode. When the display is in the limit mode, you can see the voltage and current limit values of the power supply.

28 E3632A User’s Guide

In the constant voltage mode, the voltage values between the meter and limit modes are the same, but the current values are not. Moreover, if the display is in the meter mode, you cannot see the change of current limit value when adjusting the knob. We recommend that you should set the display to the limit mode to see the change of current limit value in the constant voltage mode whenever adjusting the knob.

Operation and Features 2

Volt/Curr

Display Limit

Output On/Off

Constant Voltage Operation

4 Adjust the knob for the desired current limit.

[1]

Check that the Limit annunciator still f lashes. Set the knob for current control. The first digit of the ammeter will be flashing. The flashing digit can be changed using the resolution selection keys and the flashing digit can be adjusted by turning the knob. Adjust the knob to the desired current limit.

5 Adjust the knob for the desired output voltage.

[2]

Check that the Limit annunciator still f lashes. Set the knob for voltage control. The second digit of the voltmeter will be flashing. Change the f lashing digit using the resolution selection keys and adjust the knob for the desired output voltage.

6 Return to the meter mode.

Press or let the display time- out after several seconds to return to the meter mode. Notice that the Limit annunciator turns off and the display shows the

OUTPUT OFF message.

7 Enable the output.

The OFF annunciator turns off and the 15V or 30V, OVP, OCP, and CV annunciators are lit. Notice that the display is

in the meter mode. In the meter mode, the display shows the actual output voltage and current.

Refer to “Programming the Overvoltage Protection” on

page 35 and “Programming the Overcurrent Protection” on page 38 for more information on the OVP and OCP

annunciators.

8 Verify that the power supply is in the constant



voltage mode.

If you operate the power supply in the constant voltage (CV) mode, verify that the CV annunciator is lit. If the CC annunciator is lit, choose a higher current limit.

E3632A User’s Guide 29

[1] You can use the resolution selection keys to move the flashing digit to the right

or left when setting current.

[2] You can use the resolution selection keys to move the flashing digit to the right

or left when setting voltage.

2 Operation and Features 

NOTE

Power

30V,4A

Constant Current Operation

During actual CV operation, if a load change causes the current limit to be exceeded, the power supply will automatically cross over to the constant current mode at the preset current limit and the output voltage will drop proportionately.

Remote interface operation

CURRent {<current>|MIN|MAX} Set the current.

VOLTage {<voltage>|MIN|MAX} Set the voltage.

OUTPut ON Enable the output.

Constant Current Operation

To set up the power supply for constant current (CC) operation, proceed as follows.

Front panel operation

1 Connect a load to the output terminals.

With power- off, connect a load to the (+) and (–) output terminals.

2 Turn on the power supply.

The power supply will go into the power- on/reset state, the output is disabled (the OFF annunciator turns on), the 15 V/7 A range is selected (the 15V annunciator turns on) and the knob is selected for voltage control.

To operate the power supply in the 30 V/4 A range, press

before proceeding to the next step. The 30V

annunciator turns on.

30 E3632A User’s Guide

Operation and Features 2

Display Limit

NOTE

Volt/Curr

Display Limit

Constant Current Operation

3 Set the display to the limit mode.

In constant current mode, the current values between the meter mode and limit mode are the same, but the voltage values are not. Moreover, if the display is in the meter mode, you cannot see the change of voltage limit value when adjusting the knob. We recommend that you should set the display to the limit mode to see the change of voltage limit value in the constant current mode whenever adjusting the knob.

4 Adjust the knob for the desired voltage limit.

[1]

Check that the Limit annunciator still flashes and the second digit of voltmeter flashes to indicate the knob is selected for voltage control. The flashing digit can be changed using the resolution keys and the flashing digit can be adjusted by turning the knob. Adjust the knob for the desired voltage limit.

5 Adjust the knob for the desired output current

[1]

Check that the Limit annunciator still f lashes. Set the knob for current control. The first digit of the ammeter will be flashing. Change the flashing digit using the resolution selection keys and adjust the knob to the desired output current.

6 Return to the meter mode.

Press or let the display time- out after several seconds to return to the meter mode. Notice that the Limit annunciator turns off and the display shows the

OUTPUT OFF message.

E3632A User’s Guide 31

[1] You can use the resolution selection keys to move the flashing digit to the right

or left when setting the voltage.

2 Operation and Features 

Output On/Off

NOTE

Constant Current Operation

7 Enable the output.

The OFF annunciator turns off and the 15V or 30V, OVP, OCP, and CC annunciators are lit. Notice that the display is

in the meter mode. In the meter mode, the display shows the actual output voltage and current.

Refer to “Programming the Overvoltage Protection” on

page 35 and “Programming the Overcurrent Protection” on page 38 for more information on the OVP and OCP

annunciators.

8 Verify that the power supply is in the constant

current mode.

If you operate the power supply in the constant current (CC) mode, verify that the CC annunciator is lit. If the CV annunciator is lit, choose a higher voltage limit.

During actual CC operation, if a load change causes the voltage limit to be exceeded, the power supply will automatically cross over to constant voltage mode at the preset voltage limit and the output current will drop proportionately.



32 E3632A User’s Guide

Remote interface operation

VOLTage {<voltage>|MIN|MAX} Set the voltage.

CURRent {<current>|MIN|MAX} Set the current.

OUTPut ON Enable the output.

Storing and Recalling Operating States

Store

You can store up to three different operating states in non- volatile memory. This also enables you to recall the entire instrument configuration with just a few key presses from the front panel.

The memory locations are supplied with the reset states from the factory for front- panel operation. Refer to the description of following steps show you how to store and recall an operating state.

Front panel operation

Storing the operating state

1 Set up the power supply for the desired operating state.

The storage feature “remembers” output range selection, the limit value settings of voltage and current, output on/off state, OVP and OCP on/off state, and OVP and OCP trip levels.

2 Turn on the storage mode.

Three memory locations (numbered 1, 2, and 3) are available to store the operating states. The operating states are stored in non- volatile memory and are remembered when being recalled.

STORE 1

This message appears on the display for approximately three seconds.

3 Select the storage location.

Turn the knob to the right to specify the memory  location 3.

STORE 3

“*RST” on page 99 for more information. The

Operation and Features 2

Storing and Recalling Operating States

E3632A User’s Guide 33

2 Operation and Features 

Store

Recall

Storing and Recalling Operating States

To cancel the store operation, let the display time- out after about three seconds or press any other function key except

. The power supply returns to the normal

operating mode and to the function pressed.

4 Save the operating state.

The operating state is now stored.

DONE

This message appears on the display for approximately 1 second.

Recalling a stored state

1 Turn on the recall mode.

Memory location 1 will be displayed in the recall mode.

RECALL 1

This message appears on the display for approximately three seconds.

2 Recall the stored operating state.

Turn the knob to the right to change the displayed storage location to 3.

RECALL 3

If this setting is not followed within three seconds with

, the power supply returns to normal operating mode and will not recall the instrument state 3 from memory.

3 Restore the operating state.

DONE

This message appears on the display for approximately 1 second.

34 E3632A User’s Guide

Programming the Overvoltage Protection

Power

Output On/Off

Remote interface operation

Use the following commands to store and recall the power supply state.

*SAV {1|2|3} Store an operating state to a

specified location

*RCL {1|2|3} Recall a previously stored state from

a specified location

Programming the Overvoltage Protection

Overvoltage protection guards the load against output voltages that reach a specified value greater than the programmed protection level. It is accomplished by shorting the output via an internal SCR when the trip level is set to equal or greater than 3 V, or by progamming the output to 1 V when the trip level is set to less than 3 V.

Operation and Features 2



E3632A User’s Guide 35

The following steps show how to set the OVP trip level, how to check OVP operation, and how to clear overvoltage condition.

Front panel operation

Setting the OVP level and enable the OVP circuit

1 Turn on the power supply.

The power supply will go into the power- on/reset state, the output is disabled (the OFF annunciator turns on), the 15 V/7 A range is selected (the 15V annunciator turns on); and the knob is selected for voltage control.

2 Enable the output.

The OFF annunciator turns off and the display will go to the meter mode.

2 Operation and Features 

Over Voltage

Programming the Overvoltage Protection

3 Enter the OVP menu and set the desired trip level.

LEVEL 32.0 V

You will see the above message on the display when you enter the OVP menu. Adjust the control knob for the desired OVP trip level. Note that you cannot set the trip levels to lower than 1.0 V.

4 Enable the OVP circuit.

OVP ON

You will see the above message after pressing

5 Exit the OVP menu.

CHANGED

The CHANGED message is highlighted for a second to show that the new OVP trip level is now in effect. If the OVP settings are not changed, NO CHANGE will be displayed. The power supply will exit the OVP menu and the display will return to the meter mode. Check that the OVP annunciator turns on.

36 E3632A User’s Guide

Checking the OVP operation

To check OVP operation, raise the output voltage to near the trip point. Then very gradually increase the output by turning the knob until the OVP circuit trips. This will cause the power supply output to drop to near zero, the OVP annunciator to flash, and the CC annunciator to turn on. The

OVP TRIPPED message also appears on the display.

Clearing the overvoltage condition

When the OVP condition occurs (the OVP TRIPPED message is shown on the display), the OVP annunciator flashes. When it was caused by external voltage source such as a battery, disconnect it first. The following steps show how to clear the overvoltage conditions and get back to normal mode operation. In the following steps, the display will go back to OVP TRIPPED if you let the display time- out after about several seconds.

Operation and Features 2

Over Voltage

Display Limit

Over Voltage

NOTE

Programming the Overvoltage Protection

1 Readjust the OVP trip level or the output voltage level.

Lower the output voltage level below the OVP trip point after pressing

or raise the OVP trip level

by using the knob after pressing .

2 Move to the clear mode.

OVP ON

You will see the above message after pressing

. If you changed the output voltage level,

press the twice. Turn the knob to the right until the OVP CLEAR message appears on the display.

3 Clear the overvoltage condition and exit this menu.

Now, when you press again, the DONE message is displayed for a second and the OVP annunciator will not flash any more. The output will return to meter mode.

Remote interface operation

VOLT:PROT {<voltage>|MIN|MAX} Set the OVP level.

VOLT:PROT:STAT {OFF|ON) Disable or enable the

OVP ci rcuit.

VOLT:PROT:CLE Clear the tripped

OVP ci rcuit.

The power supply’s OVP circuit contains a crowbar SCR, which effectively shorts the output of the power supply whenever the overvoltage condition occurs. If external voltage source such as a battery is connected across the output, and the overvoltage condition inadvertently occurs, the SCR will continuously sink a large current from the source and possibly damage the power supply. To avoid this a diode must be connected in series with the output as shown in Figure 2-1.

E3632A User’s Guide 37

2 Operation and Features 

Power

Programming the Overcurrent Protection

Figure 2-1 Recommended protection circuit for battery charging

Programming the Overcurrent Protection

Overcurrent protection guards the load against output currents that reach a specified value greater than the programmed protection level. It is accomplished by programming the output current to zero.

The following steps show how to set the overcurrent protection trip level, how to check OCP operation and how to clear overcurrent condition.

Front panel operation

Setting the OCP level and enable the OCP circuit

1 Turn on the power supply.

38 E3632A User’s Guide

Operation and Features 2

Output On/Off

Over Current

Programming the Overcurrent Protection

2 Enable the output.

The OFF annunciator turns off and the display will go to the meter mode.

3 Enter the OCP menu and set the desired trip level.

LEVEL 7.5 A

You will see the above message on the display when you enter the OCP menu. Adjust the knob for the desired OCP trip level.

4 Enable the OCP circuit.

OCP ON

You will see the above message after pressing

5 Exit the OCP menu.

CHANGED

The CHANGED message is displayed for a second to show that the new OCP trip level is now in effect. If the OCP settings are not changed, NO CHANGE will be displayed. The power supply will exit the OCP menu and the display will return to the meter mode. Check that the OCP annunciator turns on.

E3632A User’s Guide 39

Checking the OCP operation

To check OCP operation, raise the output current to near the trip point. Then very gradually increase the output by turning the knob until the OCP circuit trips. This will cause the power supply’s output current to drop to zero and the OCP annunciator to flash. The OCP TRIPPED message also appears on the display.

2 Operation and Features 

Display Limit

Over Current

Display Limit

Over Current

Programming the Overcurrent Protection

Clearing the overcurrent condition

When the OCP condition occurs (the OCP TRIPPED message is shown on the display), the OCP annunciator flashes. When it was caused by external voltage source such as a battery, disconnect it first. The following steps show how to clear the overcurrent conditions and get back to normal mode operation. In the following steps, the display will go back to OCP TRIPPED if you let the display time- out after about several seconds.

1 Readjust the OCP trip level or the output current level.

Lower the output current level below the OCP trip point after pressing by using the knob after pressing .

2 Move to the clear mode.

OCP ON

You will see the above message after pressing

. If you changed the output voltage level,

press the twice. Turn the knob to the right until the OCP CLEAR message appears on the display.

3 Clear the overcoltage condition and exit this menu.

Now, when you press again, the DONE message is displayed for a second and the OCP annunciator will not flash any more. The output will return to meter mode.

or raise the OCP trip level

40 E3632A User’s Guide

Remote interface operation

CURR:PROT {<current>|MIN|MAX} Set the OCP level.

CURR:PROT:STAT {OFF|ON) Disable or enable the

OCP circuit.

CURR:PROT:CLE Clear the tripped

OCP circuit.

Remote Voltage Sensing

Remote voltage sensing is used to maintain regulation at the load and reduce the degradation of regulation that would occur due to the voltage drop in the leads between the power supply and the load.

By connecting the power supply for remote voltage sensing, voltage is sensed at the load rather than at the power supply’s output terminals. This will allow the power supply to automatically compensate for the voltage drop in applications with long lead lengths as well as to accurately read back the voltage directly across the load.

When the power supply is connected for remote sensing, the OVP circuit senses the voltage at the sensing points (load) and not the output terminals.

CV regulation

Operation and Features 2

Remote Voltage Sensing

The voltage load regulation specification in Chapter 7 applies at the output terminals of the power supply. When remote sensing, add 5 mV to this specification for each 1 V drop between the positive sensing point and (+) output terminal due to the change in load current. Because the sense leads are part of the power supply’s feedback path, keep the resistance of the sense leads at or below 0.5  per lead to maintain the above specified performance.

E3632A User’s Guide 41

2 Operation and Features 

Remote Voltage Sensing

Output rating

The rated output voltage and current specifications in

Chapter 7 apply at the output terminals of the power

supply. With remote sensing, any voltage dropped in the load leads must be added to the load voltage to calculate maximum output voltage. The performance specifications are not guaranteed when the maximum output voltage is exceeded. If the excessive demand on the power supply forces the power supply to lose regulation, the Unreg annunciator will turn on to indicate that the output is unregulated.

Output noise

Any noise picked up on the sense leads also appears at the output of the power supply and may adversely affect the voltage load regulation. Twist the sense leads to minimize external noise pickup and run them parallel and close to the load leads. In noisy environments it may be necessary to shield the sense leads. Ground the shield at the power supply end only. Do not use the shield as one of the sense

conductors.

Stability

Using remote sensing under certain combinations of load lead lengths and large load capacitances may cause your application to form a filter, which becomes part of the voltage feedback loop. The extra phase shift created by this filter can degrade the power supply’s stability, resulting in poor transient response or loop instability. In severe cases, it may cause oscillations. To minimize this possibility, keep the load leads as short as possible and twist them together. As the sense leads are part of the power supply’s programming feedback loop, accidental open- connections of

42 E3632A User’s Guide

sense or load leads during remote sensing operation have

NOTE

various unwanted effects. Provide secure and permanent connections.

Remote voltage sensing connections

Remote voltage sensing requires connecting the load leads from output terminals to the load and connecting the sense leads from sense terminals to the load as shown in

Figure 2- 2. Observe polarity when connecting the sensing

leads to the load.

Notice that the metal shorting bars should be removed from the output and sense terminals for remote voltage sensing connections.

• For local voltage sensing connections, the sense leads must be connected to the output terminals.

• During remote sensing setup, it is strongly recommended to power off (by presssing the power ON/OFF button) the power supply to avoid undesirable damage to the load or the power supply.

Operation and Features 2

Remote Voltage Sensing

Figure 2-2 Remote voltage sensing connections

E3632A User’s Guide 43

2 Operation and Features 

NOTE

Output On/Off

Disabling the Output

The output of the power supply can be disabled or enabled from the front panel.

• When the power supply is in the Off state, the OFF annunciator turns on and the output is disabled. The OFF annunciator turns off when the power supply returns to the On state. When the output is disabled, the voltage value is 0 V and the current value is 0.02 A.

• The output state is stored in volatile memory; the output is always disabled when power has been off or after a remote interface reset.

While the output is disabled, the range selection keys, the control knob, resolution selection keys, and adjust selection key are still working. If the display is in the meter mode, you cannot see the changes of output voltage and current settings on the display when turning the knob. To see or check the changes when the outputs are disabled, the display should be in the limit mode.

44 E3632A User’s Guide

Front panel operation

You can disable the output by pressing . This key toggles between output Off and On states.

Remote interface operation

OUTP {OFF|ON} Disable or enable the output.

Operation and Features 2

NOTE

Disabling the Output

Disconnecting the output using an external relay

When the output of the E3632A is turned off, it is implemented by setting the output to 0 V and 0.02 A. This gives a zero output voltage without actually disconnecting the output. To disconnect the output an external relay must be connected between the output and the load. A TTL signal of either low true or high true is provided to control an external relay. This signal can only be controlled with the remote command OUTPut:RELay {OFF|ON}. The TTL output is available on the RS- 232 connection pin 1 and pin 9.

When the OUTPut:RELay state is ON, the TTL output of pin 1 is high (4.5 V) and pin 9 is low (0.5 V). The levels are reversed when the OUTPut:RELay state is OFF.

• TTL output of pin 1 or pin 9 of the RS-232 connector is available only after installing two jumpers inside the power supply. Refer to the Service Guide (E3632-90010) for more information.

• Do not use the RS-232 interface if you have configured the power supply to output relay control signals. Internal components on the RS-232 circuitry may be damaged.



Knob locking

The knob locking function can be used to disable the knob, thereby preventing any unwanted changes during an experiment, or when you leave the power supply unattended. To disable the knob, press the resolution selection key until the blinking digit disappears.

Notice that the knob and front panel keys are disabled when in the remote interface mode.

E3632A User’s Guide 45

2 Operation and Features 

Recall

Error

Recall

System-Related Operations

This section gives information on topics such as self- test, error conditions, and front- panel display control. This information is not directly related to setting up the power supply but is an important part of operating the power supply.

Self-test

A power- on self- test occurs automatically when you turn on the power supply. This test assures you that the power supply is operational. This test does not perform the extensive set of tests that are included as part of the complete self- test described below. If the power- on self- test fails, the ERROR annunciator turns on.

A complete self- test performs a series of tests and takes approximately two seconds to execute. If all tests pass, you can have a high confidence that the power supply is operational.

If the complete self- test is successful, PASS is displayed on the front panel. If the self- test fails, FAIL is displayed and the ERROR annunciator turns on. See the Service Guide (E3632- 90010) for instructions on returning the power supply to Keysight for service.

Front panel operation

The complete self- test is enabled by pressing (actually any front panel keys except ) and the power- line switch simultaneously and then continuing to press finished in two seconds.

for five seconds. The complete self- test will be

Remote interface operation

“*TST?”

Returns 0 if the complete self- test passes or 1 if it fails.

46 E3632A User’s Guide

Error conditions

Error

When the front- panel ERROR annunciator turns on, one or more command syntax or hardware errors have been detected. A record of up to 20 errors can be stored in the power supply’s error queue. Refer to

Messages” for more information.

• Errors are retrieved in first- in- first- out (FIFO) order. The

• If more than 20 errors have occurred when you operate

• The error queue is cleared when power has been off or

Operation and Features 2

System-Related Operations

Chapter 4, “Error

first error returned is the first error that was stored. When you have read all errors from the queue, the ERROR annunciator turns off. The power supply beeps once each time an error is generated.

the power supply over the remote interface, the last error stored in the queue (the most recent error) is replaced with - 350, “Queue overflow”. No additional errors are stored until you remove errors from the queue. If no errors have occurred when you read the error queue, the power supply responds with +0, “No error” over the remote interface or NO ERRORS from the front panel.

after a *CLS (clear status) command has been executed. The *RST (reset) command does not clear the error queue.

Front panel operation

If the ERROR annunciator is on, press repeatedly to read the errors stored in the queue. All errors are cleared when you read all errors.

ERROR -113

Remote interface operation

SYST:ERR? Reads an error from the error queue

Errors have the following format (the error string may contain up to 80 characters).

- 113, “Undefined header”

E3632A User’s Guide 47

2 Operation and Features 

Local

System-Related Operations

Display control

For security reasons, you may want to turn off the front- panel display. From the remote interface, you can display a 12- character message on the front panel.

The display can be enabled/disabled from the remote interface only.

• When the display is turned off, outputs are not sent to the display and all annunciators are disabled except the ERROR annunciator. Front-panel operation is otherwise unaffected by turning off the display.

• The display state is stored in volatile memory; the display is always enabled when power has been off, after a remote interface reset, or after returning to local from remote.

• You can display a message on the front panel by sending a command from the remote interface. The power supply can display up to 12 characters of the message on the front panel; any additional characters are truncated. Commas, periods, and semicolons share a display space with the preceding character, and are not considered individual characters. When a message is displayed, outputs are not sent to the display.

• Sending a message to the display from the remote interface overrides the display state; this means that you can display a message even if the display is turned off.

The display state is automatically turned on when you return to the local (front panel) operation. Press to return to the local state from the remote interface.

Remote interface operation:

DISP {OFF|ON} Disable/enable the display.

DISP:TEXT <quoted string> Display the string enclosed in quotes

DISP:TEXT:CLE Clear the displayed message

48 E3632A User’s Guide

The following statement shows how to display a message on the front panel from a Keysight controller.

DISP:TEXT ‘HELLO’

Firmware revision query

The power supply has three microprocessors for control of various internal systems. You can query the power supply to determine which revision of firmware is installed for each microprocessor.

You can query the firmware revision from the remote interface only.

The power supply returns four fields separated by commas and the fourth field is a revision code which contains three numbers. The first number is the firmware revision number for the main processor, the second is for the input/output processor, and the third is for the front- panel processor.

Operation and Features 2

System-Related Operations

Remote interface operation

*IDN?

The above command returns a string in the form:

HEWLETT-PACKARD,E3632A,0,X.X-X.X-X.X

Be sure to dimension a string variable with at least  40 characters.

SCPI language version

The power supply complies with the rules and regulations of the present version of Standard Commands for Programmable Instruments (SCPI). You can determine the SCPI version with which the power supply is in compliance by sending a command from the remote interface.

E3632A User’s Guide 49

2 Operation and Features 

System-Related Operations

You can query the SCPI version from the remote interface only.

Remote interface operation

SYST:VERS? Query the SCPI version

Returns a string in the form of YYYY.V where the Y represents the year of the version, and the V represents the version number for that year (for example, 1995.0).

50 E3632A User’s Guide

Remote Interface Configuration

Before you can operate the power supply over the remote interface, you must configure the power supply for the remote interface. This section gives information on configuring the remote interface. For additional information on programming the power supply over the remote interface, Refer to

Remote interface selection

The power supply is shipped with both a GPIB (IEEE- 488) interface and an RS- 232 interface on the rear panel. Only one interface can be enabled at a time. The GPIB interface is selected when the power supply is shipped from the factory.

The remote interface can be selected from the front- panel only.

• The interface selection is stored in non- volatile memory,

• If you select the GPIB interface, you must select a unique

• Your GPIB bus controller has its own address. Be sure to

• If you enable the RS- 232 interface, you must select the

Chapter 3, “Remote Interface Reference”.

and does not change when power has been off or after a remote interface reset.

address for the power supply. The current address is displayed momentarily on the front panel when you turn on the power supply.

avoid using the bus controller’s address for any instrument on the interface bus. Keysight controllers generally use address 21.

baud rate and parity to be used. RS-232 is displayed momentarily on the front panel when you turn on the power supply if you have selected this interface.

Operation and Features 2

Remote Interface Configuration

[1]

[2]

[1] Refer to “GPIB Interface Configuration” on page 56 for more information on

connecting the power supply to a computer over the GPIB interface.

E3632A User’s Guide 51

2 Operation and Features 

Remote Interface Configuration

GPIB address

Each device on the GPIB (IEEE- 488) interface must have a unique address. You can set the power supply’s address to any value between 0 and 30. The current address is displayed momentarily on the front panel when you turn on the power supply. The address is set to 05 when the power supply is shipped from the factory.

The GPIB address can be set from the front- panel only.

• The address is stored in non- volatile memory, and does not change when power has been off or after a remote interface reset.

• Your GPIB bus controller has its own address. Be sure to avoid the bus controller’s address for any instrument on the interface bus. Keysight controllers generally use address 21.

Baud rate selection (RS-232)

You can select one of six baud rates for RS- 232 operation. The rate is set to 9600 baud when the power supply is shipped from the factory.

The baud rate can be set from the front- panel only.

• Select one of the following: 300, 600, 1200, 2400, 4800, 9600 baud. The factory- setting is 9600 baud.

• The baud rate selection is stored in non- volatile memory, and does not change when power has been off or after a remote interface reset.

[2] Refer to “RS-232 Interface Configuration” on page 57 for more information on

connecting the power supply to a computer over the RS-232 interface.

52 E3632A User’s Guide

Parity selection (RS-232)

I/O Config

You can select the parity for RS- 232 operation. The power supply is configured for no parity and 8 data bits when shipped from the factory.

The parity can be set from the front- panel only.

• Select one of the following: None (8 data bits), Even (7 data bits), or Odd (7 data bits). When you set the parity, you are indirectly setting the number of data bits.

• The parity selection is stored in non- volatile memory, and does not change when power has been off or after a remote interface reset.

To set the GPIB address

To configure the power supply for the GPIB interface, proceed as follows:

1 Turn on the remote configuration mode.

HPIB/488

You will see the above message on the front-panel display if the power supply has not been changed from the factory- setting. If RS-232 appears, choose HPIB/488 by turning the knob to the right.

2 Move to the GPIB address setting mode.

ADDR 05

The address is set to 05 when the power supply is shipped from the factory. Notice that a different GPIB address may appear if the power supply has been changed from the factory- setting.

3 Turn the knob to change the GPIB address.

The displayed address is changed when turning the knob to the right or left.

Operation and Features 2

Remote Interface Configuration

E3632A User’s Guide 53

2 Operation and Features 

I/O Config

NOTE

I/O Config

Remote Interface Configuration

4 Save the change and turn off the I/O configuration mode.

CHANGE SAVED

The address is stored in non- volatile memory, and does not change when power has been off or after a remote interface reset. The power supply displays a message to show that the change is now in effect. If the GPIB address is not changed, NO CHANGE will be displayed for one second.

To exit the I/O configuration mode without any further changes, press

until the NO CHANGE message is displayed.

To set the baud rate and parity (RS-232)

To configure the power supply for the RS- 232 interface, proceed as follows:

1 Turn on the remote configuration mode.

HPIB/488

You will see the above message on the display if the power supply has not been changed from the factory- setting.

Notice that if you changed the remote interface selection to RS- 232 before, RS-232 message will be displayed.

2 Choose the RS- 232 interface.

RS-232

You can choose the RS- 232 interface by turning the knob to the left.

3 Move to the RS- 232 interface setting mode and select the

baud rate.

9600 BAUD

The rate is set to 9600 baud when the power supply is shipped from the factory. Choose from one of the following by turning the knob to the right or left: 300, 600, 1200, 2400, 4800, or 9600 baud.

54 E3632A User’s Guide

Operation and Features 2

I/O Config

NOTE

I/O Config

Remote Interface Configuration

4 Save the change and choose the parity.

NONE 8 BITS

The power supply is configured for 8 data bits with no parity when shipped from the factory. Choose from one of the following by turning the knob to the right or left: None 8 Bits, Odd 7 Bits, or Even 7 Bits. When you set parity, you are indirectly setting the number of the data bits.

5 Save the change and turn off the I/O configuration mode.

CHANGE SAVED

The RS- 232 baud rate and parity selections are stored in non- volatile memory, and does not change when power has been off or after a remote interface reset. The power supply displays a message to show that the change is now in effect. If the baud rate and the parity are not changed, NO CHANGE will be displayed for one second.

To exit the I/O configuration mode without any further changes, press

until the NO CHANGE message is displayed.

E3632A User’s Guide 55

2 Operation and Features 

NOTE

GPIB Interface Configuration

The GPIB connector on the rear panel connects your power supply to the computer and other GPIB devices.

“Getting Started” lists the cables that are available from

Keysight Technologies. A GPIB system can be connected together in any configuration (star, linear, or both) as long as the following rules are observed:

• The total number of devices including the computer is not more than 15.

• The total length of all the cables used is not more than  2 m times the number of devices connected together, up to a maximum of 20 m.

IEEE-488 states that you should exercise caution if your individual cable lengths exceed 4 m.

Do not stack more than three connector blocks together on any GPIB connector. Make sure that all connectors are fully seated and that the lock screws are firmly finger tightened.

Chapter 1,

56 E3632A User’s Guide

RS-232 Interface Configuration

I/O Config

You connect the power supply to the RS- 232 interface using the 9- pin (DB- 9) serial connector on the rear panel. The power supply is configured as a DTE (Data Terminal Equipment) device. For all communications over the RS- 232 interface, the power supply uses two handshake lines: DTR (Data Terminal Ready, on pin 4) and DSR (Data Set Ready, on pin 6).

The following sections contain information to help you use the power supply over the RS- 232 interface. The programming commands for RS- 232 are explained in

“RS- 232 Interface Commands” on page 106.

RS-232 configuration overview

Configure the RS- 232 interface using the parameters shown below. Use rate, parity, and number of data bits (refer to “To set the

baud rate and parity (RS- 232)” on page 54 for more

information to configure from the front panel).

Operation and Features 2

RS-232 Interface Configuration

at the front- panel to select the baud

Baud rate:

• 300, 600, 1200, 2400, 4800, or 9600 baud (factory- setting)

Parity and data bits:

• None/8 data bits (factory- setting), even/7 data bits, or odd/7 data bits

Number of start bits:

• 1 bit (fixed)

Number of stop bits:

• 2 bits (fixed)

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2 Operation and Features 

RS-232 Interface Configuration

RS-232 data frame format

A character frame consists of all the transmitted bits that make up a single character. The frame is defined as the characters from the start bit to the last stop bit, inclusively. Within the frame, you can select the baud rate, number of data bits, and parity type. The power supply uses the following frame formats for seven and eight data bits.

Figure 2-3 RS-232 data frame format

Connection to a computer or terminal

To connect the power supply to a computer or terminal, you must have the proper interface cable. Most computers and terminals are DTE (Data Terminal Equipment) devices. Since the power supply is also a DTE device, you must use a DTE- to- DTE interface cable. These cables are also called null- modem, modem- eliminator, or crossover cables.

The interface cable must also have the proper connector on each end and the internal wiring must be correct. Connectors typically have nine pins (DB- 9 connector) or 25 pins (DB- 25 connector) with a “male” or “female” pin configuration. A male connector has pins inside the connector shell and a female connector has holes inside the connector shell.

If you cannot find the correct cable for your configuration, you may have to use a wiring adapter. If you are using a DTE- to- DTE cable, make sure the adapter is a “straight- through” type. Typical adapters include gender changers, null- modem adapters, and DB- 9 to DB- 25 adapters.

58 E3632A User’s Guide

Operation and Features 2

Instrument

DB9 Male

DB9 Female

DB9 Male

DCD RX TX DTR

1 2 3 4

5 6 7 8 9

GND DSR RTS CTS RI

1 2 3 4

5 6 7 8 9

DCD RX TX DTR

GND DSR RTS CTS RI

5182-4794

Cable

RS-232 Interface Configuration

The cable and adapter diagrams shown below can be used to connect the power supply to most computers or terminals.

DB-9 serial connection

If your computer or terminal has a 9- pin serial port with a male connector, use the null- modem cable included with the Keysight 34398A Cable Kit. This cable has a 9- pin female connector on each end. The cable pin diagram is shown in

Figure 2- 4.

Figure 2-4 DB-9 serial connection

DB-25 serial connection

If your computer or terminal has a 25- pin serial port with a male connector, use the null- modem cable and 25- pin adapter included with the Keysight 34398A Cable Kit. The cable and adapter pin diagram are shown in

E3632A User’s Guide 59

Figure 2- 5.

2 Operation and Features 

Instrument

DB9 Male

DB9 Female

DB9 Male

DCD RX TX DTR

1 2 3 4

5 6 7 8 9

GND DSR RTS CTS RI

TX RX RTS CTS

DSR GND DCD DTR

5182-4794

Cable

5181-6641

Adapter

1 2 3 4

5 6 7 8 9

1 2 3 4

5 6 7 8 9

2 3 4 5

6 7 8 20

DB25 Female

DB25 Male

RS-232 Interface Configuration

Figure 2-5 DB-25 serial connection

DTR/DSR handshake protocol

The power supply is configured as a DTE (Data Terminal Equipment) device and uses the DTR (Data Terminal Ready) and DSR (Data Set Ready) lines of the RS- 232 interface to handshake. The power supply uses the DTR line to send a hold- off signal. The DTR line must be TRUE before the power supply will accept data from the interface. When the power supply sets the DTR line FALSE, the data must cease within 10 characters.

To disable the DTR/DSR handshake, do not connect the DTR line and tie the DSR line to logic TRUE. If you disable the DTR/DSR handshake, also select a slower baud rate to ensure that the data is transmitted correctly.

60 E3632A User’s Guide

Operation and Features 2

NOTE

RS-232 Interface Configuration

The power supply sets the DTR line FALSE in the following cases:

1 When the power supply’s input buffer is full (when

approximately 100 characters have been received), it sets the DTR line FALSE (pin 4 on the RS- 232 connector). When enough characters have been removed to make space in the input buffer, the power supply sets the DTR line TRUE, unless the second case (see next) prevents this.

2 When the power supply wants to “talk” over the interface

(which means that it has processed a query) and has received a <new line> message terminator, it will set the DTR line FALSE. This implies that once a query has been sent to the power supply, the bus controller should read the response before attempting to send more data. It also means that a <new line> must terminate the command string. After the response has been output, the power supply sets the DTR line TRUE again, unless the first case (see above) prevents this.

The power supply monitors the DSR line to determine when the bus controller is ready to accept data over the interface. The power supply monitors the DSR line (pin 6 on the RS- 232 connector) before each character is sent. The output is suspended if the DSR line is FALSE. When the DSR line goes TRUE, transmission will resume.

The power supply holds the DTR line FALSE while output is suspended. A form of interface deadlock exists until the bus controller asserts the DSR line TRUE to allow the power supply to complete the transmission. You can break the interface deadlock by sending the <Ctrl- C> character, which clears the operation in progress and discards pending output (this is equivalent to the IEEE- 488 device clear action).

For the <Ctrl-C> character to be recognized reliably by the power supply while it holds DTR FALSE, the bus controller must first set DSR FALSE.

E3632A User’s Guide 61

2 Operation and Features 

RS-232 Interface Configuration

RS-232 troubleshooting

Here are a few things to check if you are having problems communicating over the RS-232 interface. If you need additional help, refer to the documentation that came with your computer.

• Verify that the power supply and your computer are configured for the same baud rate, parity, and number of data bits. Make sure that your computer is set up for one start bit and two stop bits (these values are fixed on the power supply).

• Make sure to execute the SYSTem:REMote command to place the power supply in the remote mode.

• Verify that you have connected the correct interface cable and adapters. Even if the cable has the proper connectors for your system, the internal wiring may be incorrect. The Keysight 34398A Cable Kit can be used to connect the power supply to most computers or terminals.

• Verify that you have connected the interface cable to the correct serial port on your computer (COM1, COM2, etc).

62 E3632A User’s Guide

Calibration

Operation and Features 2

Calibration

This section gives an overview of the calibration features of the power supply. For more detailed discussion of the calibration procedures, refer to the Service Guide (E3632- 90010).

Calibration security

This feature allows you to enter a security code to prevent accidental or unauthorized calibrations of the power supply. When you first receive your power supply, it is secured. Before you can calibrate the power supply, you must unsecure it by entering the correct security code.

• The security code is set to “HP003632” when the power supply is shipped from the factory. The security code is stored in non- volatile memory, and does not change when power has been off or after a remote interface reset.

• To secure the power supply from the remote interface, the security code may contain up to 12 alphanumeric characters as shown below. The first character must be a letter, but the remaining characters can be letters or numbers. You do not have to use all 12 characters but the first character must always be a letter.

A _ _ _ _ _ _ _ _ _ _ _ (12 characters)

• To secure the power supply from the remote interface so that it can be unsecured from the front panel, use the eight- character format shown below. The first two characters must be “H P” and the remaining characters must be numbers. Only the last six characters are recognized from the front panel, but all eight characters are required. To unsecure the power supply from the front panel, omit the “H P” and enter the remaining numbers as shown on the following pages.

H P _ _ _ _ _ _ (8 characters)

E3632A User’s Guide 63

2 Operation and Features 

NOTE

Calibrate

Secure

Calibration

If you forget your security code, you can disable the security feature by adding a jumper inside the power supply, and then entering a new code. Refer to the Service Guide (E3632-90010) for more information.

To unsecure for calibration

You can unsecure the power supply either from the front panel or over the remote interface. The power supply is secured when shipped from the factory, and the security code is set to “HP003632”.

Front panel operation

1 Select the calibration mode.

SECURED

If the power supply is secured, you will see the above message for one second by holding seconds when you turn on the power supply.

2 Enter the security code.

000000 CODE

To unsecure the power supply, press after the CAL MODE message is displayed in the calibration mode, enter the security code using the knob and resolution selection keys, and then press

3 Save the change and exit the menu.

UNSECURED

When you press to save the change, you will see the message above for one second if the security code is correct. The unsecured setting is stored in non- volatile memory, and does not change when power has been off or after a remote interface reset. To exit the calibration mode, turn the power off and on.

Notice that if you enter the wrong security code, INVALID is displayed and the code entering mode is displayed for you to enter the correct code.

for five

64 E3632A User’s Guide

Remote interface operation

Calibrate

Secure

CAL:SEC:STAT {OFF|ON},<code> Secure or unsecure

To unsecure the power supply, send the above command with the same code used to secure. For example:

CAL:SEC:STAT OFF, HP003632

To secure against calibration

You can secure the power supply against calibration either from the front panel or over the remote interface. The power supply is secured when shipped from the factory, and the security code is set to “HP003632”.

Read the security code rules at “Calibration security” on

page 63 before attempting to secure the power supply.

Operation and Features 2

Calibration

the power supply.

Front panel operation

1 Select the calibration mode.

UNSECURED

If the power supply is unsecured, you will see the above message for one second by holding seconds when you turn on the power supply.

2 Enter the security code.

000000 CODE

To secure the power supply, press after the CAL MODE message is displayed in the calibration mode, enter

the security code using the knob and resolution selection keys, and then press

E3632A User’s Guide 65

for five

2 Operation and Features 

Secure

Calibration

3 Save the change and exit the menu.

SECURED

When you press to save the change, you will see the message below. The secured setting is stored in non- volatile memory, and does not change when power has been off or after a remote interface reset. To exit the calibration mode, turn the power off and on.

Remote interface operation

CAL:SEC:STAT {OFF|ON},<code> Secure or unsecure

the power supply.

To secure the power supply, send the above command with the same code as used to unsecure. For example,

CAL:SEC:STAT ON, HP003632

To change the security code

To change the security code, you must first unsecure the power supply, and then enter a new code. Read the security code rules at attempting to secure the power supply.

Front panel operation

To change the security code, first make sure that the power supply is unsecured. Press message is displayed in the calibration mode, enter the new security code using the knob and resolution selection keys, then press

Changing the code from the front panel also changes the code as seen from the remote interface.

66 E3632A User’s Guide

“Calibration security” on page 63 before

after the CAL MODE

Operation and Features 2

Calibration

Remote interface operation

CAL:SEC:CODE <new code> Change the security

code.

To change the security code, first unsecure the power supply using the old security code. Then, enter the new code as shown below.

CAL:SEC:STAT OFF, HP003632 Unsecure with the

old code.

CAL:SEC:CODE ZZ001443 Enter the new code.

CAL:SEC:STAT ON, ZZ001443 Secure with the new

code.

Calibration count

You can determine the number of times that your power supply has been calibrated. Your power supply was calibrated before it left the factory. When you receive your power supply, read the count to determine its initial value.

The calibration count feature can be performed from the remote interface only.

• The calibration count is stored in non- volatile memory, and does not change when power has been turned off or after a remote interface reset.

• The calibration count increments up to a maximum of 32767 after which it wraps- around to 0. Since the value increments by one for each calibration point, a complete calibration will increase the value by five counts.

E3632A User’s Guide 67

2 Operation and Features 

Calibration

Remote interface operation

CAL:COUN? Query the number of times of calibration

Calibration message

You can use the calibration message feature to record calibration information about your power supply. For example, you can store such information as the last calibration date, the next calibration due date, the power supply’s serial number, or even the name and phone number of the person to contact for a new calibration.

You can record and read information in the calibration message from the remote interface only.

• The power supply should be unsecured before sending a calibration message.

• The calibration message may contain up to 40 characters.

• The calibration message is stored in non- volatile memory,

and does not change when power has been off or after a remote interface reset.

Remote interface operation

CAL:STR <quoted string> Store the cal message.

To store the calibration message, send the following command.

CAL:STR ‘CAL 12-05-99’

68 E3632A User’s Guide

E3632A DC Power Supply User’s Guide

3 Remote Interface Reference

SCPI Command Summary 70 Introduction to the SCPI Language 74 Simplified Programming Overview 80 Using the APPLy Command 83 Output Settings and Operation Commands 85 Triggering Commands 93 System-Related Commands 96 Calibration Commands 102 RS-232 Interface Commands 106 SCPI Status Registers 107 Status Reporting Commands 117 Halting an Output in Progress 121 SCPI Conformance Information 122 IEEE-488 Conformance Information 125

This chapter lists the SCPI commands.

3 Remote Interface Reference 

NOTE

SCPI Command Summary

If you are a first-time user of the SCPI language, refer to “Introduction to

the SCPI Language” and “Simplified Programming Overview” to familiarize

with the SCPI language before attempting to program the power supply.

This section summarizes the Standard Commands for Programmable Instruments (SCPI) available to program the power supply over the remote interface. Refer to the respective sections in this chapter for more details on each command.

Throughout this manual, the following conventions are used for the SCPI command syntax.

• Square brackets ([]) indicate optional keywords or parameters.

• Braces ({}) enclose parameters within a command string.

• Triangle brackets (<>) indicate that you must substitute a

value or a code for the enclosed parameter.

• A vertical bar (|) separates one of two or more alternative parameters.

70 E3632A User’s Guide

Tab l e 3 - 1 SCPI command summary

Output Settings and Operation Commands

APPLy {<voltage>|DEF|MIN|MAX}[,{<current>|DEF|MIN|MAX}] APPLy? [SOURce:]

CURRent[:LEVel][:IMMediate][:AMPLitude]{<current>|MIN|MAX|UP|DOWN} CURRent[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX] CURRent[:LEVel][:IMMediate]:STEP[:INCRement] {<numeric value> |DEFault} CURRent[:LEVel][:IMMediate]:STEP[:INCRement]? {DEFault} CURRent[:LEVel]:TRIGgered[:AMPLitude] {<current>|MIN|MAX} CURRent[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX] CURRent:PROTection[:LEVel] {<current>|MIN|MAX} CURRent:PROTection[:LEVel]? {MIN|MAX} CURRent:PROTection:STATe {0|1|OFF|ON} CURRent:PROTection:STATe? CURRent:PROTection:TRIPped? CURRent:PROTection:CLEar VOLTage[:LEVel][:IMMediate][:AMPLitude]{<voltage>|MIN|MAX|UP|DOWN} VOLTage[:LEVel][:IMMediate][:AMPLitude]? [MIN|MAX] VOLTage[:LEVel][:IMMediate]:STEP[:INCRement] {<numeric value>|DEFault} VOLTage[:LEVel][:IMMediate]:STEP[:INCRement]? {DEFault} VOLTage[:LEVel]:TRIGgered[:AMPLitude] {<voltage>|MIN|MAX} VOLTage[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX] VOLTage:PROTection[:LEVel] {<voltage>|MIN|MAX} VOLTage:PROTection[:LEVel]? {MIN|MAX} VOLTage:PROTection:STATe {0|1|OFF|ON} VOLTage:PROTection:STATe? VOLTage:PROTection:TRIPped? VOLTage:PROTection:CLEar VOLTage:RANGe {P15V|P30V|LOW|HIGH} VOLTage:RANGe?

MEASure

:CURRent[:DC]? [:VOLTage][:DC]?

Remote Interface Reference 3

SCPI Command Summary

Triggering Commands

INITiate[:IMMediate] TRIGger[:SEQuence]

:DELay {<seconds>|MIN|MAX} :DELay? :SOURce {BUS|IMM} :SOURce?

*TRG

E3632A User’s Guide 71

3 Remote Interface Reference 

SCPI Command Summary

Tab l e 3 - 1 SCPI command summary (continued)

System-Related Commands

DISPlay[:WINDow]

[:STATe] {OFF|ON} [:STATe]? :TEXT[:DATA] <quoted string> :TEXT[:DATA]? :TEXT:CLEar

SYSTem

:BEEPer[:IMMediate] :ERRor? :VERSion?

OUTPut

:RELay[:STATe] {OFF|ON} :RELay[:STATe]? [:STATe] {OFF|ON}

[:STATe]? *IDN? *RST *TST? *SAV {1|2|3} *RCL {1|2|3}

Calibration Commands

CALibration

:COUNt?

:CURRent[:DATA] <numeric value>

:CURRent:LEVel {MIN|MID|MAX}

:CURRent:PROTection

:DAC:ERRor

:SECure:CODE <new code>

:SECure:STATe {OFF|ON},<code>

:SECure:STATe?

:STRing <quoted string>

:STRing?

:VOLTage[:DATA] <numeric value>

:VOLTage:LEVel {MIN|MID|MAX}

:VOLTage:PROTection

RS-232 Interface Commands

SYSTem

:LOCal

:REMote

:RWLock

72 E3632A User’s Guide

Tab l e 3 - 1 SCPI command summary (continued)

Status Reporting Commands

STATus:QUEStionable

:CONDition?

[:EVENt]?

:ENABle <enable value>

:ENABle? SYSTem:ERRor? *CLS *ESE <enable value> *ESE? *ESR? *OPC *OPC? *PSC {0|1} *PSC? *SRE <enable value> *SRE? *STB? *WAI

IEEE-488 Conformance Information

*CLS *ESE <enable value> *ESE? *ESR? *IDN? *OPC *OPC? *PSC {0|1} *PSC? *RST *SAV {1|2|3} *RCL {1|2|3} *SRE <enable value> *SRE? *STB? *TRG *TST? *WAI

Remote Interface Reference 3

SCPI Command Summary

E3632A User’s Guide 73

3 Remote Interface Reference 

Introduction to the SCPI Language

Standard Commands for Programmable Instruments (SCPI) is an ASCII- based instrument command language designed for test and measurement instruments. Refer to

Programming Overview” for an introduction to the basic

techniques used to program the power supply over the remote interface.

SCPI commands are based on a hierarchical structure, also known as a tree system. In this system, associated commands are grouped together under a common node or root, thus forming subsystems. A portion of the SOURce subsystem is shown below to illustrate the tree system.

[SOURce:] CURRent {<current>|MIN|MAX|UP|DOWN} CURRent? [MIN|MAX] CURRent: TRIGgered {<current>|MIN|MAX} TRIGgered? {MIN|MAX} VOLTage {<voltage>|MIN|MAX|UP|DOWN} VOLTage? [MIN|MAX] VOLTage: TRIGgered {<voltage>|MIN|MAX} TRIGgered? {MIN|MAX}

“Simplified

SOURce is the root keyword of the command, CURRent and VOLTage are second- level keywords, and TRIGgered is the

third- level keyword. A colon (:) separates a command keyword from a lower- level keyword.

74 E3632A User’s Guide

Introduction to the SCPI Language

Command format used in this manual

The format used to show commands in this manual is shown below:

CURRent {<current>|MINimum|MAXimum|UP|DOWN}

The command syntax shows most commands (and some parameters) as a mixture of upper- case and lower-case letters. The upper- case letters indicate the abbreviated spelling for the command. For shorter program lines, send the abbreviated form. For better program readability, send the long form.

For example, in the above syntax statement, CURR and CURRENT are both acceptable forms. You can use upper-case or lower- case letters. Therefore, CURRENT, curr, and Curr are all acceptable. Other forms, such as CUR and CURREN, will generate an error.

Braces ({}) enclose the parameter choices for a given command string. The braces are not sent with the command string.

Remote Interface Reference 3

A vertical bar (|) separates multiple parameter choices for a given command string.

Triangle brackets (<>) indicate that you must specify a value for the enclosed parameter. For example, the above syntax statement shows the current parameter enclosed in triangle brackets. The brackets are not sent with the command string. You must specify a value for the parameter (such as CURR 0.1).

Some parameters are enclosed in square brackets ([]). The brackets indicate that the parameter is optional and can be omitted. The brackets are not sent with the command string. If you do not specify a value for an optional parameter, the power supply chooses a default value.

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3 Remote Interface Reference 

Introduction to the SCPI Language

Some portions of commands are enclosed in square brackets ([]). The brackets indicate that this portion of the command is optional. Most optional portions of the command are not shown in the command description. For the full command showing all the options, refer to

A colon (:) separates a command keyword from a lower- level keyword. You must insert a blank space to separate a parameter from a command keyword. If a command requires more than one parameter, you must separate adjacent parameters using a comma as shown below:

SOURce:CURRent:TRIGgered APPLy 3.5,1.5

Table 3- 1.

Command separators

A colon (:) is used to separate a command keyword from a lower-level keyword as shown below:

SOURce:CURRent:TRIGgered

A semicolon (;) is used to separate two commands within the same subsystem, and can also minimize typing. For example, sending the following command string,

SOUR:VOLT MIN;CURR MAX

is the same as sending the following two commands:

SOUR:VOLT MIN SOUR:CURR MAX

Use a colon and a semicolon to link commands from different subsystems. For example, in the following command string, an error is generated if you do not use the colon and semicolon:

DISP:TEXT:CLE;:SOUR:CURR MIN

76 E3632A User’s Guide

Using the MIN and MAX parameters

CAUTION

You can substitute MINimum or MAXimum in place of a parameter for many commands. For example, consider the following command:

CURRent {<current>|MIN|MAX}

Instead of selecting a specific current, you can substitute

MINimum to set the current to its minimum value or MAXimum to set the current to its maximum value.

Querying parameter settings

You can query the value of most parameters by adding a question mark (?) to the command. For example, the following command sets the output current to 5 A:

CURR 5

You can query the value by executing:

Remote Interface Reference 3

Introduction to the SCPI Language

E3632A User’s Guide 77

CURR?

You can also query the maximum or minimum value allowed with the present function as follows:

CURR? MAX

CURR? MIN

If you send two query commands without reading the response from the first, and then attempt to read the second response, you may receive some data from the first response followed by the complete second response. To avoid this, do not send a query command without reading the response. When you cannot avoid this situation, send a device clear before sending the second query command.

3 Remote Interface Reference 

Introduction to the SCPI Language

SCPI command terminators

A command string sent to the power supply must terminate with a <new line> character. The IEEE- 488 EOI (end- or- identify) message is interpreted as a <new line> character and can be used to terminate a command string in place of a <new line> character. A <carriage return> followed by a <new line> is also accepted. Command string termination will always reset the current SCPI command path to the root level. The <new line> character has the ASCII decimal code of 10.

IEEE-488.2 common commands

The IEEE- 488.2 standard defines a set of common commands that perform functions like reset, self- test, and status operations. Common commands always begin with an asterisk (*), are four to five characters in length, and may include one or more parameters. The command keyword is separated from the first parameter by a blank space. Use a semicolon (;) to separate multiple commands as shown below:

*RST; *CLS; *ESE 32; *OPC?

SCPI parameter types

The SCPI language defines several different data formats to be used in program messages and response messages.

Numeric parameters

Commands that require numeric parameters will accept all commonly used decimal representations of numbers including optional signs, decimal points, and scientific notation. Special values for numeric parameters like MINimum, MAXimum, and DEFault are also accepted.

78 E3632A User’s Guide

Keysight E3632A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Table of Contents

List of Figures

List of Tables

1 Getting Started

Introduction

Standard Shipped Items

Options

Accessories

Preparing the Power Supply

Preliminary checkout

Power-on checkout

Checking the output

Input power requirements

Rack-mount the power supply

Product at a Glance

Front panel

Rear panel

Display annunciators

Operating the Power Supply

Cooling

Bench operation

Cleaning

2 Operation and Features

Overview

Constant Voltage Operation

Front panel operation

Constant Current Operation

Remote interface operation

Front panel operation

Remote interface operation

Storing and Recalling Operating States

Front panel operation

Programming the Overvoltage Protection

Remote interface operation

Front panel operation

Remote interface operation

Programming the Overcurrent Protection

Front panel operation

Remote interface operation

Remote Voltage Sensing

CV regulation

Output rating

Output noise

Stability

Remote voltage sensing connections

Disabling the Output

Front panel operation

Remote interface operation

Disconnecting the output using an external relay

Knob locking

System-Related Operations

Self-test

Error conditions

Display control

Firmware revision query

SCPI language version

Remote Interface Configuration

Remote interface selection

GPIB address

Baud rate selection (RS-232)

Parity selection (RS-232)

To set the GPIB address

To set the baud rate and parity (RS-232)

GPIB Interface Configuration

RS-232 Interface Configuration

RS-232 configuration overview

RS-232 data frame format

Connection to a computer or terminal

DTR/DSR handshake protocol

RS-232 troubleshooting

Calibration

Calibration security

To unsecure for calibration

To secure against calibration

To change the security code

Calibration count