Agilent Technologies E3634A, E3633A User Manual

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User’s Guide

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The Agilent E3633A and Agilent E3634A are high performance 200 watt singleoutput dual range programmable DC power supplies with both GPIB and RS232 interfaces. The combination of bench-top and system features in these power supplies provides versatile solutions for your design and test requirements.

Convenient bench-top features

• Single-output dual range

• Easy-to-use knob control settings

• Highly visible vacuum-fluorescent display meters

• High accuracy and high resolution

• Remote voltage sensing

• Overvoltage and overcurrent protection

• Output on/off

• Excellent load and line regulation and low ripple and noise

• Operating states storage

• Portable, ruggedized case with non-skid feet

• Front and Rear output terminals

• Retrieving/Scrolling error messages on the display

Flexible system features

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

• SCPI (Standard Commands for Programmable Instruments) compatibility

• I/O setup easily done from front-panel

• Software calibration, no internal adjustments required

Agilent E3633A and E3634A DC Power Supplies

The Front Panel at a Glance

1 8V/20A range selection key (E3633A) 25V/7A range selection key (E3634A) 2 20V/10A range selection key (E3633A) 50V/4A range selection key (E3634A)

3 Overvoltage protection key 4 Overcurrent protection key 5 Display limit key 6 Recall operating state key

7 Store operating state/Local key 8 Error/Calibrate key 9 I/O Configuration/Secure key

10 Output On/Off key 11 Control knob 12 Resolution selection keys 13 Voltage/current adjust selection key

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

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

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

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

3 Overvoltage protection key Enables or disables the overvoltage protection

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

4 Overcurrent protection key Enables or disables the overcurrent protection

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

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

allows knob adjustment for setting limit values.

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

location ‘‘1’’, ‘‘2’’, or ‘‘3’’.

7 Store operating state / Local key

Stores an operating state in location ‘‘1’’, ‘‘2’’, or ‘‘3’’ / or returns the power supply to local mode from remote interface mode.

8 E r ror / Cal ibrate k e y

Displays error codes generated during operation, selftest and calibration / or enables calibration mode (the power supply must be unsecured before performing calibration). See Service Guide for more details on calibration.

9 I/O Configuration / Secure key

Configures the power supply for remote interfaces / or secure or unsecure the power supply for calibration. See Service Guide for more details on how to secure or unsecure the power supply.

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

toggles between on and off.

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

clockwise or counter clockwise.

12 Resolution selection keys Move the blinking digit to the right or left. 13 Voltage/current adjust selection key Selects the knob control function for

voltage or current adjustment.

The key can be used as the ‘‘Local’’ key when the power supply is in the remote

interface mode.

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

turn on the power supply.

You can use it as the ‘‘Secure’’ or ‘‘Unsecure’’ key when the power supply is

in the calibration mode.

*For Agilent E3633A Model **For Agilent E3634A Model

Front-Panel Voltage and Current Limit Settings

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

Use the voltage/current adjust selection key, the resolution selection keys, and the control knob to change the voltage and current limit values.

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

power supply.

2 Press the 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 the key again.

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

will go to output monitoring mode automatically to display the voltage and current at the output or the display will go to output monitoring mode immediately by pressing the

Display

key to show the limit values on the display.

Limit

Volt ag e Current

Output

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

On/Off

Output

key again.

On/Off

Display Limit

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

The Agilent E3633A and Agilent E3634A must be in "Local" mode for the front panel keys and controls to function.

Display Annunciators

Adrs Power supply is addressed to listen or talk over a remote interface. Rmt Power supply is in remote interface mode. 8V Shows the 8V/20A range is selected. (Agilent E3633A model) 20V Shows the 20V/10A range is selected. (Agilent E3633A model) 25V Shows the 25V/7A range is selected. (Agilent E3634A model) 50V Shows the 50V/4A range is selected. (Agilent E3634A model) OVP The overvoltage protection function is enabled when the

annunciator turns on or the overvoltage protection circuit has caused the power supply to shutdown when the annunciator blinks.

OCP The overcurrent protection function is enabled when the

annunciator turns on or the overcurrent protection circuit has caused the power supply to shutdown when the annunciator blinks.

CAL The power supply is in calibration mode. Limit The display shows the limit values of voltage and current. ERROR Hardware or remote interface command errors are detected and

the error bit has not been cleared.

OFF The output of the power supply is disabled (See page 52 for more

information).

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

nor CC).

CV The power supply is in constant voltage mode. CC The power supply is in constant current mode.

To review the display annunciators, hold down key as you turn on

Display Limit

the power supply.

The Rear Panel at a Glance

1 Power-line voltage setting 2 Power-line fuse-holder assembly 3 AC inlet

5 GPIB (IEEE-488) interface connector 6 RS-232 interface connector

7 Rear output terminals

4 Power-line module

Use the front-panel key to:

I/O Config

• Select the GPIB or RS-232 interface (see chapter 3).

• Set the GPIB bus address (see chapter 3).

• Set the RS-232 baud rate and parity (see chapter 3).

In This Book

General Information Chapter 1 contains a general description of your power supply. This chapter also provides instructions for checking your power supply, connecting to ac power, and selecting power-line voltage.

Initial Operation C ha pt e r 2 en su r es th at th e p o we r s up pl y d e ve l op s i ts ra te d outputs and properly responds to operation from the front panel.

Front-Panel Operation Chap ter 3 describes in detail the use of front-panel keys and how they are used to operate the power supply from the front panel. This chapter also shows how to configure the power supply for the remote interface and gives a brief introduction to the calibration features.

Remote Interface Reference Chapter 4 contains reference information to help you program the power supply over the remote interface. This chapter also explains how to program for status reporting.

Error Messages Chapter 5 lists the error messages that may appear as you are working with the power supply. Each listing contains information to help you diagnose and solve the problem.

Application Programs Chapter 6 contains some remote interface applications to help you develop programs for your application.

Tutorial Chapter 7 describes basic operation of linear power supplies and gives specific details on the operation and use of the Agilent E3633A and Agilent E3634A power supplies.

Specifications Chapter 8 lists the power supply’s specifications.

If you have questions relating to the operation of the power supply, call 1-800-452-4844 in the United States, or contact your nearest Agilent Technologies Sales Office.

If your Agilent E3633A or Agilent E3634A fails within three years of purchase, Agilent will repair or replace it free of charge. Call 1-800-258-5165 ("Express Exchange") in the United States, or contact your nearest Agilent Technologies Sales Office.

Chapter 1 General Information

Safety Considerations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 14

Safety and EMC Requirements - - - - - - - - - - - - - - - - - - - - - - - - 14

Options and Accessories - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15

Options- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15

Accessories - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15 Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16 Installation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

Initial Inspection - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19

Cooling and Location - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 19 Input Power Requirements - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 22

Power-Line Cord - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 22

Power-Line Voltage Selection - - - - - - - - - - - - - - - - - - - - - - - - - 22

Chapter 2 Initial Operation

Preliminary Checkout- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 27 Power-On Checkout - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 28 Output Checkout- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 29

Voltage Output Checkout - - - - - - - - - - - - - - - - - - - - - - - - - - - - 29

Current Output Checkout - - - - - - - - - - - - - - - - - - - - - - - - - - - - 30

Chapter 3 Front-Panel Operation

Front-Panel Operation Overview - - - - - - - - - - - - - - - - - - - - - - - - - 35 Constant Voltage Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 36 Constant Current Operation- - - - - - - - - - - - - - - - - - - - - - - - - - - - - 38 Storing and Recalling Operating States - - - - - - - - - - - - - - - - - - - - 40 Programming Overvoltage Protection - - - - - - - - - - - - - - - - - - - - - 42

Setting the OVP Level and Enable the OVP Circuit - - - - - - - - 42

Checking OVP Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43

Clearing the Overvoltage Condition - - - - - - - - - - - - - - - - - - - - 43 Programming Overcurrent Protection - - - - - - - - - - - - - - - - - - - - - 46

Setting the OCP Level and Enable the OCP Circuit - - - - - - - - 46

Checking OCP Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47

Clearing the Overcurrent Condition - - - - - - - - - - - - - - - - - - - - 47 Remote Voltage Sensing at the Front and Rear Terminals - - - - - 49

CV Regulation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

Output Rating - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

Output Noise - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49

Stability - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 50

Remote Voltage Sensing Connections - - - - - - - - - - - - - - - - - - 50

Remote Voltage Sensing at the Rear Panel - - - - - - - - - - - - - - 51

Contents

Disabling the Output - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 52 Disabling the Output Using an External Relay- - - - - - - - - - - - - - - 53 Knob Locking- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 53 System-Related Operations- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54

Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54 Error Conditions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 55 Display Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 56 Firmware Revision Query - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57 SCPI Language Version - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57

Remote Interface Configuration - - - - - - - - - - - - - - - - - - - - - - - - - - 58

Remote Interface Selection - - - - - - - - - - - - - - - - - - - - - - - - - - - 58 GPIB Address - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 59 Baud Rate Selection (RS-232) - - - - - - - - - - - - - - - - - - - - - - - - - 59 Parity Selection (RS-232)- - - - - - - - - - - - - - - - - - - - - - - - - - - - - 59 To Set the GPIB Address - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 60

To Set the Baud Rate and Parity (RS-232) - - - - - - - - - - - - - - - 61 GPIB Interface Configuration - - - - - - - - - - - - - - - - - - - - - - - - - - - - 63 RS-232 Interface Configuration- - - - - - - - - - - - - - - - - - - - - - - - - - - 64

RS-232 Configuration Overview - - - - - - - - - - - - - - - - - - - - - - - 64

RS-232 Data Frame Format - - - - - - - - - - - - - - - - - - - - - - - - - - - 64

Connection to a Computer or Terminal - - - - - - - - - - - - - - - - - 65

DTR / DSR Handshake Protocol - - - - - - - - - - - - - - - - - - - - - - - 66

RS-232 Troubleshooting- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 67 Calibration Overview - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 68

Calibration Security - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 68

Calibration Count- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 72

Calibration Message - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 72

Chapter 4 Remote Interface Reference

SCPI Command Summary - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 75 Simplified Programming Overview- - - - - - - - - - - - - - - - - - - - - - - - 80

Using the

Using the Low-Level Commands- - - - - - - - - - - - - - - - - - - - - - - 80

Reading a Query Response - - - - - - - - - - - - - - - - - - - - - - - - - - - 81

Selecting a Trigger Source- - - - - - - - - - - - - - - - - - - - - - - - - - - - 81

Power Supply Programming Ranges- - - - - - - - - - - - - - - - - - - - 82 Using the Output Setting and Operation Commands - - - - - - - - - - - - - - - - - - 84 Triggering Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 91

Trigger Source Choices - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 91

Triggering Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 93 System-Related Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 94

APPLy

Command - - - - - - - - - - - - - - - - - - - - - - - - - - 80

Command - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 83

Contents

Calibration Commands- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 98 RS-232 Interface Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - 101 The SCPI Status Registers - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 102

What is an Event Register? - - - - - - - - - - - - - - - - - - - - - - - - - - 102 What is an Enable Register? - - - - - - - - - - - - - - - - - - - - - - - - - 102 SCPI Status System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 103 The Questionable Status Register- - - - - - - - - - - - - - - - - - - - - 104 The Standard Event Register - - - - - - - - - - - - - - - - - - - - - - - - 105 The Status Byte Register - - - - - - - - - - - - - - - - - - - - - - - - - - - - 106 Using Service Request (SRQ) and Serial POLL - - - - - - - - - - 107 Using *STB? to Read the Status Byte - - - - - - - - - - - - - - - - - - 108 Using the Message Available Bit (MAV) - - - - - - - - - - - - - - - - 108 To Interrupt Your Bus Controller Using SRQ - - - - - - - - - - - 108 To Determine When a Command Sequence is Completed - 109

Using *OPC to Signal When Data is in the Output Buffer - - 109 Status Reporting Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - 110 An Introduction to the SCPI Language - - - - - - - - - - - - - - - - - - - 113

Command Format Used in This Manual- - - - - - - - - - - - - - - - 114

Command Separators - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 115

Using the MIN and MAX Parameters - - - - - - - - - - - - - - - - - - 115

Querying Parameter Settings - - - - - - - - - - - - - - - - - - - - - - - - 116

SCPI Command Terminators - - - - - - - - - - - - - - - - - - - - - - - - 116

IEEE-488.2 Common Commands - - - - - - - - - - - - - - - - - - - - - 116

SCPI Parameter Types - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 117 Halting an Output in Progress - - - - - - - - - - - - - - - - - - - - - - - - - - 118 SCPI Conformance Information- - - - - - - - - - - - - - - - - - - - - - - - - 119 IEEE-488 Conformance Information - - - - - - - - - - - - - - - - - - - - - 122

Chapter 5 Error Messages

Contents

Execution Errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 125 Self-Test Errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 130 Calibration Errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 131

Chapter 6 Application Programs

Example Program for C and C++- - - - - - - - - - - - - - - - - - - - - - - - 135 Example Program for Excel 97 - - - - - - - - - - - - - - - - - - - - - - - - - 139

Chapter 7 Tutorial

Overview of Agilent E3633A and Agilent E3634A Operation - - 147 Output Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 149

Unregulated State - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 151

Unwanted Signals - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 151 Connecting the Load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 153

Contents

Output Isolation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 153 Multiple Loads - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 153 Remote Voltage Sensing - - - - - - - - - - - - - - - - - - - - - - - - - - - - 154 Load Consideration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 155

Extending the Voltage and Current Range - - - - - - - - - - - - - - - - - 157

Series Connections - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 157

Parallel Connections - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 157 Remote Programming - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 158 Reliability - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 160

Chapter 8 Specifications

Performance Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - 163 Supplemental Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - 165

Contents

General Information

This is the User’s guide for your Agilent E3633A and E3634A DC power supplies. Unless otherwise stated, the information in this manual applies to both two models.

This chapter provides a general description of your power supply. This chapter also contains instructions for initial inspection, location and cooling for bench and rack operation, selecting the power-line voltage, and connecting your power supply to ac power.

Safety Considerations

This power supply is a Safety Class I instrument, which means that it has a protective earth terminal. That 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. See also ‘‘Safety’’ at the beginning of this manual for general safety information.

Safety and EMC Requirements

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

• IEC 1010-1(1990)/EN 61010-1(1993) + A2 (1995): Safety Requirements for

Electrical Equipment for Measurement, Control, and Laboratory Use

• CSA C22.2 No.1010.1-92: Safety Requirements for Electrical Equipment for

Measurement, Control, and Laboratory Use

• EN50082-1(1992):

IEC 1000-4-2(1995): Electrostatic Discharge Requirements IEC 1000-4-3(1995): Radiated Electromagnetic Field Requirements

IEC 1000-4-4(1995): Electrical Fast Transient/Burst Requirements EN61000-4-5(1995): Surge Requirements EN61000-4-6(1995): Conducted Radio Frequency Immunity Requirements EN61000-4-8(1993): Magnetic Field Requirements EN61000-4-11(1994): Voltage dips, short, interruption and var Requirement

• Low Voltage Directive 73/23/EEC

• EMC Directive 89/336/EEC

Chapter 1 General Information

Options and Accessories

• EN 55011(1991) Group 1, Class A/CISPR 11(1990): Limits and Methods of Radio Interference Characteristics of Industrial, Scientific, and Medical (ISM) Radio - Frequency Equipment

Options and Accessories

Options

Option ‘‘0E3’’ and ‘‘0E9’’ determine which power-line voltage is selected at the factory. The standard unit is configured for 115 Vac ± 10%, 47-63 Hz input voltage. For more information about changing the power-line voltage setting, see ‘‘Power-Line Voltage Selection’’, starting on page 22 in this chapter.

Option Description

0E3 0E9 1CM 910

230 Vac ± 10%, 47-63 Hz input voltage 100 Vac ± 10%, 47-63 Hz input voltage Rack mount kit (Agilent part number 5063-9243) Extra manual set (same language as the selected language manual set when you order the power supply)*

Accessories

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

Agilent No. Description

10833A 10833B 34398A

34399A

*To order a separate set of English User’s guide and Service guide, order Agilent part number E3634-90000.

GPIB cable, 1 m (3.3 ft.) GPIB cable, 2 m (6.6 ft.) RS-23 2, 9 pin (f) to 9 pin ( f), 2.5 m (8.2 ft.) cable; pl us 9 p in (m) to 25 pin (f) adapter RS-232 adapter kit (contains 4 adapters): 9 pin (m) to 25 pin (m) for use with PC or printer 9 pin (m) to 25 pin (f) for use with PC or printer 9 pin (m) to 25 pin (m) for use with modem 9 pin (m) to 9 pin (m) for use with modem

Chapter 1 General Information

Description

The Agilent E3633A and Agilent E3634A DC power supplies feature a combination of programming capabilities and linear power supply performance that makes them 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. An output range needed is selected from the front panel or over the remote interfaces.

Operational features include:

• Dual range of single-output: 8V/20A and 20V/10A (Agilent E3633A), 25V/7A and 50V/4A (Agilent E3634A)

• Constant voltage (CV) or constant current (CC) operation

• Overvoltage protection (OVP) and overcurrent protection (OCP)

• Three storage locations (1 to 3) for user-defined operating states

• Automatic turn-on self-test

• Remote sensing for load voltage at the front or rear panel terminals

• User calibration from the front panel or over the remote interfaces

The front panel operation permits:

• Easy-to-use of knob control

• Output range selection

• Enabling or disabling OVP and OCP features

• Setting the OVP and OCP trip levels

• Clearing OVP and OCP conditions

• Setting and displaying the voltage and current limit values

• Saving and recalling operating states

• Returning the power supply to local mode from remote interface mode

• Retrieving/Scrolling error messages on the display

• Calibrating the power supply, including changing the calibration secure code

• Configuring the power supply for remote interfaces

• Enabling or disabling the output

Chapter 1 General Information

Description

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. Capabilities include the following features:

• Voltage and current programming

• Voltage and current readback

• Present and stored status readback

• Programming syntax error detection

• Complete self-test

The front-panel VFD (Vacuum-Fluorescent Display) includes:

• Displaying actual values of output voltage and current (meter mode)

• Or displaying the limit values of voltage and current (limit mode)

• Checking the operating status from the annunciators

• Checking the type of error from the error codes (messages)

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

Warning Floating the power supply output more than ±60 Vdc from the chassis presents an

electric shock hazard to the operator. Do not float the outputs more than ±60 Vdc when metal shorting bars without insulation are used to connect the (+) output to the (+) sense and the (-) output to the (-) sense terminals.

Chapter 1 General Information

Description

Warning Outputs can be floated to maximum of ±240 Vdc provided that the metal shorting bars

without insulation are either replaced with insulated conductors or they are removed from the terminals so there is no operator access to the output conductors without insulation. All field wiring insulation must be adequate for the voltage present.

The power supply is shipped with a detachable, 3-wire grounding type power cord. The ac line fuse is an extractor type on the rear panel. The power supply can be calibrated from the front panel directly or with a controller over the GPIB or RS-232 interface using calibration commands. Correction factors are stored in nonvolatile memory and are used during output programming. Calibration from the front panel or a controller eliminate the need to remove the top cover or even the need to remove the power supply from your system c ab i ne t. You c an g ua r d a g ai ns t u n au th or iz ed c al i br at io n by us in g th e “S ec ur e d” calibration protection function.

Chapter 1 General Information

Installation

Initial Inspection

When you receive your power supply, inspect it for any obvious damage that may have occurred during shipment. If any damage is found, notify the carrier and the nearest Agilent Sales Office immediately. Warranty information is shown in the front of this manual.

Keep the original packing materials in case the power supply has to be returned to Agilent Technologies in the future. If you return the power supply for service, attach a tag identifying the owner and model number. Also include a brief description of the problem.

Mechanical Check

This check confirms that there are no broken keys or knob, that the cabinet and panel surfaces are free of dents and scratches, and that the display is not scratched or cracked.

Electrical Check

Chapter 2 describes an initial operation procedure which, when successfully completed, verifies to a high level of confidence that the power supply is operating in accordance with its specifications. Detailed electrical verification procedures are included in the Service Guide.

Cooling and Location

Cooling

The power supply can operate without loss of performance within the temperature range of 0 °C to 40 °C, and with derated output current from 40 °C to 55 °C. A fan cools the power supply by drawing air through the rear panel and exhausting it out the sides. Using an Agilent rack mount will not impede the flow of air.

Bench Operation

Your power supply must be installed in a location that allows sufficient space at the sides and rear of the power supply for adequate air circulation. The rubber bumpers must be removed for rack mounting.

Chapter 1 General Information

Installation

Rack Mounting

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 (P/N 5063-9243). Installation instructions and hardware are included with each rack-mounting kit. Any Agilent System II instrument of the same size can be rack-mounted beside the Agilent E3633A or E3634A DC power supply.

Remove the front and rear bumpers before rack-mounting the power supply.

To remove the rubber bumper, stretch a corner and then slide it off.

To rack mount a single instrument, order adapter kit 5063-9243.

Chapter 1 General Information

Installation

To rack mount two instrument side-by-side, order lock-link kit 5061-9694 and flange kit 5063-9214.

To install one or two instruments in a sliding support shelf, order shelf 5063-9256, and slide kit 1494-0015.

Chapter 1 General Information

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 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 on the next page.

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 Agilent 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; the third conductor being 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.

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:

Chapter 1 General Information

Input Power Requirements

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

Rotate the power-line voltage selector

until the correct voltage appears.

Install the correct line fuse. Remove the power-line voltage selector from the power-line module.

100 or 115 Vac, 6.3 AT fuse

230 Vac, 3.15 AT fuse

Replace the power-line voltage selector and the fuse-holder assembly in the rear panel.

100, 115, or 230 Vac

Chapter 1 General Information

Input Power Requirements

Initial Operation

There are three basic tests in this chapter. The automatic power-on test includes a self-test that checks the internal microprocessors and allows the user visually to check the display. The output check ensures that the power supply develops its rated outputs and properly responds to operation from the front panel. For complete performance and/or verification tests, refer to the

Service Guide

This chapter is intended for both the experienced and the inexperienced user because it calls attention to certain checks that should be made prior to operation.

Throughout this chapter the key to be pressed is shown in the left margin.

Chapter 2 Initial Operation

Preliminary Checkout

The following steps help you verify that the power supply is ready for use.

1 Check the list of supplied items.

Verify that you have received the following items with your power supply. If anything is missing, contact your nearest Agilent Technologies Sales Office.

One power cord for your location. This User’s Guide. One Service Guide. Certificate of Calibration.

2 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, 115, or 230 Vac.

3 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 or 115 Vac operation, you must use a 6.3 AT fuse. For 230 Vac operation, you must use a 3.15 AT fuse.

4 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.

See ‘‘Power-Line Voltage Selection’’, starting on page 22 in chapter 1 if you need to change the power-line voltage or the power-line fuse.

To replace the 6.3 AT fuse, order Agilent part number 2110-1030. To replace the 3.15 AT fuse, order Agilent part number 2110-1031.

Chapter 2 Initial Operation

Power-On Checkout

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

1 The front-panel display will light up briefly while the instrument

performs its power-on self-test.

To review the power-on display with all annunciators turned on, hold down

Display

key as you turn on the power supply.

Limit

2 The GPIB address or RS-232 is also displayed for about one second.

ADDR 05 (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.

See "Remote Interface Configuration" in chapter 3 starting on page 58 if you need to change the remote interface configuration.

3The “

8V”* or “25V”**, “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

OFF annunciator turns on); the 8/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for voltage

OVP and OCP annunciator also turn on.

Output On/Off

control. Notice that the

4 Enable the outputs.

OFF annunciator turns off and the 8V* or 25V**, OVP, OCP, and CV

The 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

annunciator will turn on. See "Error Messages" for more information starting on page 123 in chapter 5

*For Agilent E3633A Model **For Agilent E3634A Model

Power

Output On/Off

Chapter 2 Initial Operation

Output Checkout

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.

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

Voltage Output Checkout

The following steps verify basic voltage functions with no load.

1 Turn on the power supply.

The power supply will go into the power-on / reset state; the output is disabled

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for voltage

control.

2 Enable the outputs.

OFF annunciator turns off and the 8V* or 25V**, OVP, OCP, and CV

3 Check that the front-panel voltmeter properly responds to knob

control for the 8V/20A* or 25V/7A** 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.

Adjust the knob until the voltmeter indicates 0 volts and then adjust the knob until the voltmeter indicates ‘‘

You can use the resolution selection keys to move the blinking digit to the

8.0 volts’’* or ‘‘25.0 volts’’**

right or left when setting the voltage.

*For Agilent E3633A Model **For Agilent E3634A Model

Power

Output On/Off

Display Limit

Volt ag e Current

Chapter 2 Initial Operation

Output Checkout

Current Output Checkout

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

1 Turn on the power supply.

The power supply will go into the power-on / reset state; the output is disabled

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for voltage

control.

2 Connect a short across (+) and (-) output terminals with an insulated

test lead.

Use a wire size sufficient to handle the maximum current (See "Table 7-1 Wire Rating" on page 153 in chapter 7).

3 Enable the output.

OFF annunciator turns off and the 8V* or 25V**, OVP, and OCP

The annunciators are lit. 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 volt.

Set the display to the limit mode (the the voltage limit to 1.0 volt to assure CC operation. The turn on. To go back to normal mode, press the key again or let the display time out for several seconds .

5 Set the knob to the current control to check that the front-panel

ammeter properly responds to knob control.

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).

CV or CC annunciator turns on depending on the

Limit annunciator will be blinking). Adjust

Display Limit

CC annunciator will

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 2 Initial Operation

Output Checkout

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

value.

Adjust the knob until the ammeter indicates 0 amps and then until the ammeter indicates 20.0 amps* or 7.0 amps**.

7 Turn off the power supply and remove the short from the output.

You can use the resolution selection keys to move the blinking digit to the

right or left when setting the current.

Note 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 123 in chapter 5

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 2 Initial Operation

Output Checkout

Front-Panel Operation

So far you have learned how to install your power supply and perform initial operation. During the initial operation, you were briefly introduced to operating from the front panel as you learned how to check basic voltage and current functions. This chapter will describe in detail the use of these frontpanel keys and show how they are used to accomplish power supply operation.

• Front-Panel Operation Overview, on page 35

• Constant Voltage Operation, starting on page 36

• Constant Current Operation, starting on page 38

• Storing and Recalling Operating States, starting on page 40

• Programming Overvoltage Protection, starting on page 42

• Programming Overcurrent Protection, starting on page 46

• Remote Voltage Sensing at the front and rear panel, starting on page 49

• Disabling the Output, on page 52

• Disabling the Output Using an External Relay, on page 53

• Knob Locking, on page 53

• System-Related Operations, starting on page 54

• Remote Interface Configuration, starting on page 58

• GPIB Interface Configuration, on page 63

• RS-232 Interface Configuration, starting on page 64

• Calibration Overview, starting on page 68

Throughout this chapter the key to be pressed is shown in the left margin.

Note See "Error Messages", starting on page 123 in chapter 5 if you encounter any errors

during front-panel operation.

Chapter 3 Front-Panel Operation

Front-Panel Operation 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 frontpanel 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 the

Store

(Local) key if you did not previously send the front-panel lockout

Local

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. 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

20V for the E3633A and 25V or 50V for the E3634A annunciator indicates

or the presently selected range.

• When you press key (the

Display Limit

Limit annunciator blinks), 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 the key again or let the display

Display Limit

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 by pressing key. When the output is off, the

Output On/Off

OFF annunciator

turns on and the output is disabled.

• 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 8V/20A* or 25V/7A** range and controlled from the front panel, then the

CV and 8V* or 25V** annunciators

will turn on. If, however, the power supply is remotely controlled, the annunciator will also turn on, and when the power supply is being addressed over GPIB interface, the

Adrs annunciator will turn on. See “Display

Annunciators’ on page 5 for more information.

Rmt

*For Agilent E3633A Model **For Agilent E3634A Model

Power

Display Limit

Chapter 3 Front-Panel Operation

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.

The power supply will go into the power-on / reset state; the output is disabled

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for voltage control.

20V,10A 50V,4A

Press * or ** key to operate the power supply in the 20V/10A* or 50V/4A** range before proceeding to the next step. The annunciator turns on.

3 Set the display to the limit mode.

Notice that the

Limit annunciator blinks, indicating that the display is in the

limit mode. When the disp lay is in the limit mode, you can see the voltage and current limit values of the power supply.

20V* or 50V**

Volt ag e Current

In 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 “limit” mode to see the change of current limit value in the constant voltage mode whenever adjusting the knob.

4 Adjust the knob for the desired current limit.

Check that the

Limit annunciator still blinks. Set the knob for current control.

The second digit of the ammeter will be blinking. The blinking digit can be changed using the resolution selection keys and the blinking digit can be adjusted by turning the knob. Adjust the knob to the desired current limit.

You can use the resolution selection keys to move the blinking digit to the

right or left when setting current.

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Front-Panel Operation

Constant Voltage Operation

Volt ag e Current

Display Limit

Output On/Off

5 Adjust the knob for the desired output voltage.

Check that the

Limit annunciator still blinks. Set the knob for voltage control.

The second digit of the voltmeter will be blinking. Change the blinking digit using the resolution selection keys and adjust the knob to the desired output voltage.

6 Return to the meter mode.

Display

Press key or let the display time-out after several seconds to return to

Limit

the meter mode. Notice that the

Limit annunciator turns off and the display

shows “OUTPUT OFF” message.

7 Enable the output.

OFF annunciator turns off and the 8V* (or 25V**) or 20V* (or 50V**), OVP,

The

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 Overvoltage Protection” and “Programming Overcurrent Protection” sections, starting on page 42 and page 46 for more information on

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

CV annunciator is lit. If the CC annunciator is lit, choose a higher current

the limit.

OVP and OCP annunciators.

Note During actual CV operation, if a load change causes the current limit to be exceeded,

the power supply will automatically crossover 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

You can use the resolution selection keys to move the blinking digit to the

right or left when setting voltage.

*For Agilent E3633A Model **For Agilent E3634A Model

Power

Display Limit

Chapter 3 Front-Panel Operation

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

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for voltage control.

To operate the power supply in the 20V/10A* or 50V/4A** range, press *

50V,4A

or ** key before proceeding to the next step. The annunciator turns on.

3 Set the display to the limit mode.

Notice that the

Limit annunciator blinks, indicating that the display is in the

limit mode. When the disp lay is in the limit mode, you can see the voltage and current limit values of the selected supply.

20V* or 50V**

20V,10A

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 “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.

Check that the

Limit annunciator still blinks and the second digit of voltmeter

blinks to indicate the knob is selected for voltage control. The blinking digit can be changed using the resolution keys and the blinking digit can be adjusted by turning the knob. Adjust the knob for the desired voltage limit.

You can use the resolution selection keys to move the blinking digit to the

right or left when setting the voltage.

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Front-Panel Operation

Constant Current Operation

Volt ag e Current

Display Limit

Output On/Off

5 Adjust the knob for the desired output current.

Check that the

Limit annunciator still blinks. Set the knob for current control.

The second digit of the ammeter will be blinking. Change the blinking digit using the resolution selection keys and adjust the knob to the desired output current.

6 Return to the meter mode.

Display

Press key or let the display time-out after several seconds to return the

Limit

meter mode. Notice that the

Limit annunciator turns off and the display shows

“OUTPUT OFF” message.

7 Enable the output.

OFF annunciator turns off and the 8V* (or 25V**) or 20V* (or 50V**), OVP,

The

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 Overvoltage Protection” and “Programming Overcurrent Protection” sections, starting on page 42 and page 46 for more information on

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

CC annunciator is lit. If the CV annunciator is lit, choose a higher voltage

the limit.

OVP and OCP annunciators.

Note During actual CC operation, if a load change causes the voltage limit to be exceeded,

the power supply will automatically crossover to constant voltage mode at the preset voltage limit and the output current will drop proportionately.

• Remote interface operation:

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

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

OUTPut ON Enable the output

You can use the resolution selection keys to move the blinking digit to the

right or left when setting the current.

*For Agilent E3633A Model **For Agilent E3634A Model

Store

Chapter 3 Front-Panel Operation

Storing and Recalling Operating States

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 page 96 in chapter 4 for more information. The following steps show you how to store and recall an operating state.

• Front-panel operation:

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.

command, starting on

*RST

STORE 1

This message appears on the display for approximately 3 seconds.

3 Store the operating state in memory location “3”.

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

STORE 3

To cancel the store operation, let the display time-out after about 3 seconds or press any other function key except the key. The power supply returns to the normal operating mode and to the function pressed.Save the operating state.

Store

Chapter 3 Front-Panel Operation

Storing and Recalling Operating States

Store

Recall

4 Save the operating state.

The operating state is now stored. To recall the stored state, go to the following steps.

DONE

5 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 3 seconds.

6 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 3 seconds with key stroke, the power supply returns to normal operating mode and will not recall the instrument state 3 from memory.

7 Restore the operating state.

The power supply should now be configured in the same state as when you stored the state on the previous steps.

Recall

DONE

This message appears on the display for approximately 1 second.

• Remote interface operation:

*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

Power

Output On/Off

Over Vol ta ge

Chapter 3 Front-Panel Operation

Programming 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 volts, or by progamming the output to 1 volt when the trip level is set to less than 3 volts.

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

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for

power-on / reset

2 Enable the output.

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

The

3 Enter the OVP menu and set the trip level.

state; the output is disabled

control.

voltage

Over Vol ta ge

LEVEL 22222.0V (E3633A)

LEVEL 55555.0V (E3634A)

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 volt.

4 Enable the OVP circuit.

OVP ON

You will see the above message after pressing key.

*For Agilent E3633A Model **For Agilent E3634A Model

Over Vol ta ge

Chapter 3 Front-Panel Operation

Programming Overvoltage Protection

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 on.

OVP annunciator turns

Display Limit

Over Vol ta ge

Checking 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 annunciator to blink, and the

CC annunciator to turn on. The “OVP TRIPPED”

OVP

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 blinks. When it was caused by an external voltage source such as a battery, disconnect it first. Clear the overvoltage condition by adjusting output voltage level or by adjusting OVP trip level.

The following steps show how to clear the overvoltage condition 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.

• Adjust output voltage level

1 Lower the output voltage level.

Lower the output voltage level below the OVP trip point after pressing key. The

OVP and Limit annunciators are blinking.

2 Move to the clear mode.

Display Limit

OVP

OVP CLEAR

OVPOVP

Over

Press key twice to move to the OVP CLEAR mode. The “OVP ON”

Vol ta ge

message appears on the display. Turn the knob to the right until the above message appears on the display.

Over Vol ta ge

Chapter 3 Front-Panel Operation

Programming Overvoltage Protection

3 Clear the overvoltage condition and exit this menu.

Now, when you press key again, the “DONE” message is displayed for a s ec o nd a n d th e

OVP annunciator will not blink any more. The output will return

Over Vol ta ge

to meter mode.

• Adjust OVP trip level

1 Raise the OVP trip level.

Over

Press key and turn the knob to raise the OVP trip level.

Vol ta ge

2 Move to the OVP CLEAR mode.

OVP

OVP CLEAR

OVPOVP

Over

Press key to move to the OVP CLEAR mode. The “OVP ON” message

Vol ta ge

appears on the display. Turn the knob to the right until the above message appears on the display.

3 Clear the overvoltage condition and exit this menu.

Now, when you press key again, the “DONE’’ message is displayed for a second and the

Over Vol ta ge

OVP annunciator will not blink any more. The output will

return to the meter mode.

• Remote interface operation:

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

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

VOLT:PROT:CLE Clear the tripped OVP circuit

Note 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; possibly damaging the power supply. To avoid this a diode must be connected in series with the output as shown in Figure 3-1 on next page.

Chapter 3 Front-Panel Operation

Programming Overvoltage Protection

Figure 3-1. Recommended Protection Circuit for Battery Charging

Power

Output On/Off

Over Current

Chapter 3 Front-Panel Operation

Programming 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.

The power supply will go into the power-on / reset state; the output is disabled

OFF annunciator turns on); the 8V/20A* or 25V/7A** range is selected (the

(the

8V* or 25V** annunciator turns on); and the knob is selected for voltage control.

2 Enable the output.

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

The

3 Enter the OCP menu and set the trip level.

Over Current

LEVEL 22222.0 A

LEVEL 7777.5 A

(E3633A)

(E3634A)

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 the key.

*For Agilent E3633A Model **For Agilent E3634A Model

Over Current

Chapter 3 Front-Panel Operation

Programming Overcurrent Protection

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.

Display Limit

Over Current

Checking 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 blink. The “OCP TRIPPED” message also appears on the

display.

Clearing the Overcurrent Condition

When the OCP condition occurs (the “OCP TRIPPED” message is shown on the display), the OCP annunciator blinks. When it was caused by external voltage sources such as a battery, disconnect it first. Clear the overcurrent condition by adjusting output current level or by adjusting OCP trip level.

The following steps show how to clear the overcurrent condition 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.

• Adjust output current level

1 Lower the output current level.

Display

Press key and set the knob for current control by pressing key,

Limit

Volt ag e Current

then lower the output current level below the OCP trip point.

2 Move to the clear mode.

OCP

OCP CLEAR

OCPOCP

Over

Press key twice to move to the OCP CLEAR mode. The “OCP ON”

Current

message appears on the display. Turn the knob to the right until the above message appears on the display.

Over Current

Chapter 3 Front-Panel Operation

Programming Overcurrent Protection

3 Clear the overcurrent condition and exit this menu.

Now, when you press key again, the “DONE’’ message is displayed for a second and the

Over Current

OCP annunciator will not blink any more. The output will

return to meter mode. The knob is selected for current control.

Notice that the power supply is operated in the constant current (CC) mode.

• Adjust OCP trip level

1 Raise the OCP trip level.

Over

Press key and turn the knob to raise the OCP trip level.

Current

2 Move to the OCP CLEAR mode.

OCP

OCP CLEAR

OCPOCP

Press the key to move to the OCP CLEAR mode. The “OCP ON” message appears on the display. Turn the knob to the right until the above message appears on the display.

3 Clear the overcurrent condition and exit this menu.

Now, when you press key again, the “DONE’’ message is displayed for

Over Current

a second and the OCP annunciator will not blink any more. The output will return to the meter mode.

• 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

Chapter 3 Front-Panel Operation

Remote Voltage Sensing at the Front and Rear Terminals

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

The voltage load regulation specification in chapter 8 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 9 per lead to maintain the above specified performance.

Output Rating

The rated output voltage and current specifications in chapter 8 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 annunciator will turn on to indicate that the output is unregulated.

Unreg

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 loa d l ea ds . I n n oi sy en vir on me nt s i t m ay be ne cess ar y t o s hi el d t he se nse l ea ds . Ground the shield at the power supply end only. Do not use the shield as one of the sense conductors.

Chapter 3 Front-Panel Operation

Remote Voltage Sensing at the Front and Rear Terminals

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 sense or load leads during remote sensing operation have various unwanted effects. Provide secure and permanent connections.

Remote Voltage Sensing Connections

Connections between the power supply sensing and output terminals should be removed, and using shielded two-wire cable, the power supply sensing terminals should be connected to the load as shown in Figure 3-2. Do not use

the shield as one of the sensing conductors and the other end should be left unconnected. Connect one end of the sensing lead shield to the chassis ground

^) only. Opening a sensing lead causes the power supply output voltage to

( decrease at the load leads. Observe polarity when connecting the sensing leads to the load.

For local voltage sensing connections, the (+) and (-) sense terminals must be connected to the (+) and (-) output terminals respectively.

Note When you make the remote voltage sensing connections at the front or rear panel

terminals, make sure to disconnect all the connections to the load and sense leads at the other end terminals. Do not make the sensing connections at both front and rear terminals at the same time. It will cause to damage the power supply seriously.

Figure 3-2. Remote Voltage Sensing Connections

Chapter 3 Front-Panel Operation

Remote Voltage Sensing at the Front and Rear Terminals

Remote Voltage Sensing at the Rear Panel

External sense terminals are also available on the back of the power supply that allow the rear output voltages to be sensed at the load, which compensates for impedance losses in the load wiring. The front panel binding posts are paralleled with the rear output terminals.

The rear output terminals accept wires sizes from AWG 22 to AWG 10. To minimize the possibility of instability on the output, keep load leads as short

as possible and bundle or twist the leads tightly together to minimize inductance.

Figure 3-3. Rear local sensing connections

Note For rear local voltage sensing connections, the front shorting bars must be removed

first and connect the sense wires as shown in Figure 3-3.

Chapter 3 Front-Panel Operation

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

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 volts and the current value is 0.02 amps.

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.

OFF annunciator turns on and

• Front-panel operation:

You can disable the output by pressing key. This key toggles between

Output On/Off

output “Off” and “On” states.

• Remote interface operation:

OUTP {OFF|ON} Disable or enable the output

Chapter 3 Front-Panel Operation

Disabling the Output Using an External Relay

When the output of the power supply is turned off, it is implemented by setting the output to 0 volts and 0.02 amps. 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 is available on the RS-232 connection pin 1 and pin 0.

When the (4.5 V) and pin 9 is low (0.5 V). The levels are reversed when the

OUTPut:RELay

Note TTL output of pin 1 or pin 9 of the RS-232 connector is available only after installing

two jumpers inside the power supply. See the Service Guide for more information.

OUTPut:RELay

state is “OFF”.

state is “ON”, the TTL output of pin 1 is high

OUTPut:RELay {OFF|ON}

. The TTL

Note 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 control knob can be locked to prevent from any unwanted changes occurring during an experiment, or when you leave the power supply unattended. To lock the knob, move the blinking digit to the right or left using the resolution selection key or until the blinking digit disappears.

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

Chapter 3 Front-Panel Operation

System-Related Operations

Thi s s ec ti on gi ve s inf or ma ti on on to pic s s uc h a s s el f- te st , e rr or co nd it io ns , a nd 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 selftest described below. If the power-on self-test fails, the turns on.

•A complete self-test performs a series of tests and takes approximately 2 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 on. See the Service Guide for instructions on returning the power supply to Agilent Technologies for service.

ERROR annunciator

ERROR annunciator turns

• Front-panel operation:

To perform the complete front panel self-test, hold down the key as you turn on the power supply and hold down the key until you hear a long beep. The self-test will begin when you release the key following the beep.

• Remote interface operation:

*TST?

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

Recall

Chapter 3 Front-Panel Operation

System-Related Operations

Error Conditions

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. See chapter 5 “Error Messages”, starting on page 123 for a complete listing of the errors.

• Errors are retrieved in first-in-first-out (FIFO) order. The first error returned is the first error that was stored. Errors are cleared as you read them over the remote interface. 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.

• If more than 20 errors have occurred when you operate the power supply over the remote interface, the last error stored in the queue (the most recent error) is replaced with -350, “Too many errors”. 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.

• The error queue is cleared when power has been off or after a status) command has been executed. The

(reset) command does not

*RST

clear the error queue.

*CLS

(clear

• Front-panel operation:

Store

Press ( supply is in remote operation mode.

Local) key to return to front-panel operation mode if the power

Local

3: ERR -102

ERROR annunciator is on, press key to view the errors. Use the

If the knob to scroll through the error numbers. Press to view the text of the error message. Press or key to increase or decrease the scrolling

speed of the text on the display. All errors are cleared wh en yo u exit the menu or let the display time out for about 30 seconds.

• Remote interface operation:

SYSTem:ERRor? Read and clear one error from the error queue

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

-102, ‘‘Syntax error

’’

Error

Chapter 3 Front-Panel Operation

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 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. Co mma s, p e riods, a nd semic olon s share a d isp lay spa ce w ith the prec edin g 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 ( from the remote interface.

ERROR annunciator. Front-panel

Store

Local) key to return to the local state

Local

• 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

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

‘‘

DISP:TEXT ‘HELLO

’ ’’

Chapter 3 Front-Panel Operation

System-Related Operations

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.

• Remote interface operation:

*IDN? Returns

‘‘HEWLETT-PACKARD,E3633A,0,X.X-X.X-X.X’’ (E3633A)

‘‘HEWLETT-PACKARD,E3634A,0,X.X-X.X-X.X’’ (E3634A)

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

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 “YYYY.V” where the “Y’s” represent the year of the version, and the “V” represents a version number for that year (for example,

1996.0).

Chapter 3 Front-Panel Operation

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, See "Remote Interface Reference", starting on page 73 in chapter 4.

Remote Interface Selection

The power supply is shipped with both a GPIB (IEEE-488) interface and an RS232 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, and does not change when power has been off or after a remote interface reset.

• If you select the GPIB interface, you must select a unique address for the power supply. The current address is displayed momentarily on the front panel when you turn on the power supply.

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

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

Refer to "GPIB Interface Configuration" starting on page 63 for more information

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

Refer to "RS-232 Interface Configuration" starting on page 64 for more information

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

Chapter 3 Front-Panel Operation

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. Agilent Technologies 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.

Parity Selection (RS-232)

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 bi ts , factory setting), Even (7 da ta 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.

I/O Config

Chapter 3 Front-Panel Operation

Remote Interface Configuration

To Set the GPIB Address

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

1 Turn on the remote configuration mode.

GPIB / 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 “GPIB / 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.

I/O Config

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.

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

Config” key until the “NO CHANGE” message is displayed.

I/O Config

Chapter 3 Front-Panel Operation

Remote Interface Configuration

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.

GPIB / 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.

I/O Config

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.

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.

Chapter 3 Front-Panel Operation

Remote Interface Configuration

I/O Config

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.

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

Config” key until the “NO CHANGE” message is displayed.

Chapter 3 Front-Panel Operation

GPIB Interface Configuration

The GPIB connector on the rear panel connects your power supply to the compu ter and other GPIB devices. Chapter 1 lists the cables that are available from Agilent 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 no more than 15.

• The total length of all the cables used is no more than 2 meter times the number of devices connected together, up to a maximum of 20 meters.

Note IEEE-488 states that you should exercise caution if your individual cable lengths

exceed 4 meters.

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 3 Front-Panel Operation

RS-232 Interface Configuration

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 on page 101.

RS-232 Configuration Overview

Configure the RS-232 interface using the parameters shown below. Use the front-panel key to select the baud rate, parity, and number of data bits (see page 59 for more information to configure from the front panel).

• Baud Rate: 300, 600, 1200, 2400, 4800, or 9600 baud (factory setting)

• Parity and Data Bits: None / 8 data bits (factory setting)

• Number of Start Bits: 1 bit (fixed)

• Number of Stop Bits: 2 bits (fixed)

I/O Config

Even / 7 data bits, or Odd / 7 data bits

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.

Chapter 3 Front-Panel Operation

RS-232 Interface Configuration

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 9 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.

The cable and adapter diagrams shown below can be used to connect the power supply to most computers or terminals. If your configuration is different than those described, order the Agilent 34399A Adapter Kit. This kit contains adapters for connection to other computers, terminals, and modems. Instructions and pin diagrams are included with the adapter kit.

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 Agilent 34398A Cable Kit. This cable has a 9-pin female connector on each end. The cable pin diagram is shown below.

Chapter 3 Front-Panel Operation

RS-232 Interface Configuration

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 Agilent 34398A Cable Kit. The cable and adapter pin diagram are shown below.

DTR / DSR Handshake Protocol

The power supply is configured as a DTE (Data Terminal Equipment) device and uses the DTR (Da ta 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.

The power supply sets the DTR line FALSE in the following two 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 RS232 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.

Chapter 3 Front-Panel Operation

RS-232 Interface Configuration

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.

RS-232 Troubleshooting

He re ar e a fe w t hi ng s to c he ck if yo u a re h av in g p ro blem s c om mu ni cati ng ov er 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 1 start bit and 2 stop bits (these values are fixed on the power supply).

• Make sure to execute the 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 Agilent 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).

SYSTem:REMote

command to place the power

Chapter 3 Front-Panel Operation

Calibration Overview

This section gives an overview of the calibration features of the power supply. For more detailed discussion of the calibration procedures, see the Service Guide.

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 “HP003633”* or “HP003634”** 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 t he po we r s up ply f ro m th e f ro nt pa ne l, om it th e “ H P ” a nd en te r the remaining numbers as shown on the following pages.

H P_ _ _ _ _ _ (6 characters)

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. See the Service Guide for more information.

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Front-Panel Operation

Calibration Overview

To Unsecure for Calibration You can unsecure the power supply for 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 “HP003633”* or “HP003634”**

• Front-Panel Operation:

SECURED

If the power supply is secured, you will see the above message for one second by holding ( supply. To unsecure the power supply, press ( “CAL MODE” message is displayed in the calibration mode, enter the security

Error

Calibrate) key for 5 seconds when you turn on the power

Calibrate

I/O

Config

Secure) key after the

Secure

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

Secure) key.

(

000000000 CODE

I/O

Config

When you press ( message below for one second if the security code is correct. The unsecured

Secure) key to save the change, you will see the

Secure

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.

UNSECURED

Notice that if the security is incorrect, the power supply displays an “INVALID” message for a second and returns to the code entering mode for you to enter the correct code.

• Remote Interface Operation:

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

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

‘‘

CAL:SEC:STAT OFF, HP003633’’ (E3633A)or

‘‘

CAL:SEC:STAT OFF, HP003634’’ (E3634A)

I/O

Config

Secure

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Front-Panel Operation

Calibration Overview

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 “HP003633”* or “HP003634”**.

Be sure to read the security code rules on page 68 before attempting to secure the power supply.

• Front-Panel Operation:

UNSECURED

If the power supply is unsecured, you will see the above message for one second by holding ( power supply. To secure the power supply, press ( “CAL MODE” message is displayed in the calibration mode, enter the security

Error

Calibrate) key for 5 seconds when you turn on the

Calibrate

I/O

Config

Secure) key after the

Secure

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

Secure) key.

(

Notice that you should omit the “HP” and enter the remaining numbers as shown below.

000000 CODE

I/O

Config

When you press ( message below. The secured setting is stored in non-volatile memory, and does

Secure) key to save the change, you will see the

Secure

not change when power has been off or after a remote interface reset. To exit the calibration mode, turn the power off and on.

SECURED

• 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, HP003633’’ (E3633A) or

‘‘

CAL:SEC:STAT ON, HP003634’’ (E3634A)

I/O

Config

Secure

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Front-Panel Operation

Calibration Overview

To Change the Security Code To change the security code, you must first unsecure the power supply, and then enter a new code.

Be sure to read the security code rules on page 68 before attempting to secure the power supply.

• Front-Panel Operation:

To change the security code, first make sure that the power supply is unsecured. Press ( d is p la y e d i n t he c al i b ra ti o n m o d e, en te r th e n ew s e cu r it y c od e u si n g t h e control knob and resolution selection keys, then press (

I/O

Config

Secure) key after the “CAL MODE” message is

Secure

I/O

Config

Secure) key.

Secure

Changing the code from the front panel also changes the code required from the remote interface.

• 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. For example,

‘‘

CAL:SEC:STAT OFF, HP003633* or HP003634**

‘‘

CAL:SEC:CODE ZZ001443

‘‘

CAL:SEC:STAT ON, ZZ001443

’’

’ ’

Unsecure with old code

Enter new code

Secu re wi th new co de

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 3 Front-Panel Operation

Calibration Overview

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 off or after a remote interface reset.

• The calibration count increments up to a maximum of 32,767 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 5 counts.

• 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

The following command string shows how to store a calibration message.

‘‘

CAL:STR ‘CAL 12-05-98

’ ’’

Remote Interface Reference

• SCPI Command Summary, starting on page 75

SCPI

• Simplified Programming Overview, starting on page 80

• Using the APPLy Command, on page 83

• Output Setting and Operation Commands, on page 84

• Triggering Commands, starting on page 91

• System-Related Commands, starting on page 94

• Calibration Commands, starting on page 98

• RS-232 Interface Commands, on page 101

• The SCPI Status Registers, starting on page 102

• Status Reporting Commands, starting on page 110

SCPI

• An Introduction to the SCPI Language, starting on page 113

• Halting an Output in Progress, on page 118

• SCPI Conformance Information, starting on page 119

• IEEE-488 Conformance Information, on page 122

SCPI

If you are a first-time user of the SCPI language, you may want to refer to these sections to become familiar with the language before attempting to program the power supply.

Chapter 4 Remote Interface Reference

SCPI Command Summary

This section summarizes the SCPI (Standard Commands for Programmable Instruments) commands available to program the power supply over the

remote interface. Refer to the later sections in this chapter for more complete details on each command.

Throughout this manual, the following conventions are used for 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.

SCPI

First-time SCPI users, see page 113.

Chapter 4 Remote Interface Reference

SCPI Command Summary

Output Setting and Measurement Commands

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

APPLy?

[SOURce:]

CURRent[:LEVel][:IMMediate][:AMPLitude]{

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 {P8V*|P20V*|P25V**|P50V**|LOW|HIGH}

VOLTage:RANGe?

MEASure

:CURRent[:DC]?

[:VOLTage][:DC]?

<current>|MIN|MAX|UP|DOWN}

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 4 Remote Interface Reference

SCPI Command Summary

Triggering Commands

INITiate[:IMMediate]

TRIGger[:SEQuence] :DELay {<seconds>|MIN|MAX}

:DELay?

:SOURce {BUS|IMM}

:SOURce?

*TRG

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}

Chapter 4 Remote Interface Reference

SCPI Command Summary

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

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

Chapter 4 Remote Interface Reference

SCPI Command Summary

RS-232 Interface Commands

SYSTem

:LOCal

:REMote

:RWLock

IEEE-488.2 Common Commands

*CLS

*ESR? *ESE <enable value>

*ESE?

*IDN?

*OPC

*OPC?

*PSC {0|1}

*PSC?

*RST

*SAV {1|2|3}

*RCL {1|2|3}

*STB? *SRE <enable value>

*SRE?

*TRG

*TST?

*WAI

Chapter 4 Remote Interface Reference

Simplified Programming Overview

This section gives an overview of the basic techniques used to program the power supply over the remote interface. This section is only an overview and does not give all of the details you will need to write your own application programs. Refer to the remainder of this chapter and also chapter 6, “Application Programs”, for more details and examples. Also refer to the programming reference manual that came with your computer for details on outputting command strings and entering data.

Using the APPLy Command

The the power supply over the remote interface. For example, the following statement executed from your computer will set the power supply to an output of 3 V rated at 1 A:

‘‘APPL 3.0, 1.0

command provides the most straightforward method to program

APPLy

’’

Using the Low-Level Commands

Although the program the power supply, the low-level commands give you more flexibility to change individual parameters. For example, the following statements executed from your computer will set the power supply to an output of 3 V rated at 1 A:

‘‘VOLT 3.0

‘‘CURR 1.0

APPLy

command provides the most straightforward method to

’’

Set output voltage to 3.0 V

Set output current to 1.0 A

Chapter 4 Remote Interface Reference

Simplified Programming Overview

Reading a Query Response

Only the query commands (commands that end with “ ? ” ) will instruct the power supply to send a response message. Queries return either output values or internal instrument settings. For example, the following statements executed from your computer will read the power supply’s error queue and print the most recent error:

dimension statement

‘‘SYST:ERR?

bus enter statement Enter error string into computer

print statement Print error string

’’

Dimension string array (80 elements)

Read error queue

Selecting a Trigger Source

The power supply will accept a ‘‘bus’’ (software) trigger or an immediate internal trigger as a trigger source. By default, the ‘‘BUS’’ trigger source is selected. If you want the power supply to use an immediate internal trigger, you must select ‘‘ executed from your computer will set to an output of 3 V/1 A immediately:

‘‘VOLT:TRIG 3.0

‘‘CURR:TRIG 1.0

‘‘TRIG:SOUR IMM

‘‘INIT

IMMediate

’’

’’. For example, the following statements

’’

Set the triggered voltage level to 3.0 V

Set the triggered current level to 1.0 A

Select the immediate trigger as a source

Cause the trigger system to initiate

Chapter 4 Remote Interface Reference

Simplified Programming Overview

Power Supply Programming Ranges

The

SOURce

available programming value for a parameter varies according to the desired output range of the power supply. The following table lists the programming values available and Agilent E3633A and E3634A power supplies.

Refer to this table to identify programming values when programming the power supply.

able 4-1. Agilent E3633A Programming Ranges

Voltage Programming Range 0 V to 8.24V 0 V to 20.60 V

Current Programming Range 0 A to 20.60 A 0 A to 10.30 A

subsystem requires parameters for programming values. The

MINimum, MAXimum, DEFault

0 - 8V/20A Range 0 - 20V/10A Range

MAX Value 8.24 V 20.60 V

MIN Value 0 V 0 V

DEFault Value 0 V 0 V

*RST Value 0 V

MAX Value 20.60 A 10.30 A

MIN Value 0 A 0 A

DEFault Value 20 A 10 A

*RST Value 20.00 A

and reset values of the

Table 4-2. Agilent E3634A Programming Ranges

0 - 25V/7A Range 0 - 50V/4A Range

Voltage Programming Range 0 V to 25.75V 0 V to 51.5 V

MAX Value 25.75 V 51.5 V

MIN Value 0 V 0 V

DEFault Value 0 V 0 V

*RST Value 0 V

Current Programming Range 0 A to 7.21 A 0 A to 4.12 A

MAX Value 7.21 A 4.12 A

MIN Value 0 A 0 A

DEFault Value 7.0 A 4.0 A

*RST Value 7.00 A

Chapter 4 Remote Interface Reference

Using the APPLy Command

The the power supply over the remote interface. You can select the output voltage and current in one command.

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

This command is combination of as the newly programmed values are within the presently selected range, the output voltage and current are changed as soon as the command is executed.

The programmed values only if the programmed values are valid within the presently selected range. An execution error will occur if the programmed values are not valid within the selected range.

You can substitute ‘‘ specific value for the voltage and current parameters. values of ‘‘0’’ volts and ‘‘0’’ amps. the selected range.

The default values of voltage and current are ‘‘0’’ volts and ‘‘20’’* or ‘‘7’’** amps regardless of the presently selected range. For more details of parameters, see Table 4-1 for the Agilent E3633A model and Table 4-2 for the Agilent E3634A model.

If you specify only one parameter of the regards it as voltage setting value.

APPLy?

This command queries the power supply’s present voltage and current setting values and returns a quoted string. The voltage and current are returned in sequence as shown in the sample string below (the quotation marks are returned as part of the string).

command provides the most straightforward method to program

APPLy

VOLTage

command changes the power supply’s output to the newly

APPLy

MINimum

’’, ‘‘

MAXimum

MAX

and

CURRent

’’, or ‘‘

DEFault

selects the highest values allowed for

APPLy

command, the power supply

commands. As long

’’ in place of a selects the lowest

MIN

‘‘8.00000,20.00000’’* or ‘‘25.00000,7.00000’’**

In the above string, the first number 8.00000 is the voltage setting value and the second number 20.00000 is the current setting value.

*For Agilent E3633A Model **For Agilent E3634A Model

Chapter 4 Remote Interface Reference

Output Setting and Operation Commands

This section describes low-level commands used to program the power supply. Although the program the power supply, the low-level output setting commands give you more flexibility to change the individual parameters.

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

This command programs the immediate current level of the power supply. The immediate level is the current value of the output terminals.

The

CURRent

programmed value regardless of the output range presently selected. You can substitute ‘‘

the current parameter. selects the highest current values allowed for the selected range.

This command also increases or decreases the immediate current level using the ‘‘UP’’ or ‘‘

CURRent:STEP

increment setting will cause an execution error -222 (Data out of range) when the maximum or the minimum rated current is exceeded.

APPLy

DOWN

command provides the most straightforward method to

command changes the output of the power supply to the newly

MINimum

MIN

’’ parameter by a predetermined amount. The command

sets the amount of increase or decrease. Notice that a new

’’ or ‘‘

MAXimum

selects the lowest current values of ‘‘0’’ amps.

’’ in place of a specific value for

MAX

CURRent Example

The following program segments show how to use the

CURR DOWN CURR:STEP

‘‘

CURR:STEP 0.01

‘‘

CURR UP

‘‘

CURR:STEP 0.02

‘‘

CURR DOWN

command to increase or decrease the output current with the command.

’’

Set the step size to 0.01 A

Increase the output current

Set the step size to 0.02 A

Decrease the output current

CURR UP

Chapter 4 Remote Interface Reference

Output Setting and Operation Commands

CURRent? [MINimum | MAXimum]

This query returns the presently programmed current level of the power supply. programmable current levels for the selected range.

CURRent:STEP {<numeric value>|DEFault}

This command sets the step size for current programming with the

To set the st e p size t o the min imum resolution, set the ste p size to ‘‘ The minimum resolution of the step size is approximately 0.32 mA (E3633A) and 0.13 mA (E3634A) respectively. The minimum resolution of your instrument. The immediate current level increases or decreases by the value of the step size. For example, the output current will increase or decrease 10 mA if the step size is 0.01.

This command is useful when you program the power supply to the allowed minimum resolution. At resolution.

CURR? MAX

and

CURRent DOWN

and

CURR? MIN

commands. See the example in the previous page.

*RST

return the highest and lowest

CURR:STEP? DEF

, the step size is the value of the minimum

returns the

CURRent

DEFault

’’.

CURRent:STEP? {DEFault}

This query returns the value of the step size currently specified. The returned parameter is a numeric value. ‘‘ step size in unit of amps.

CURRent:TRIGgered {<current>| MINimum | MAXimum}

This command programs the pending triggered current level. The pending triggered current level is a stored value that is transferred to the output terminals when a trigger occurs. A pending triggered level is not affected by subsequent

CURRent:TRIGgered? [MINimum | MAXimum]

This query returns the triggered current level presently programmed. If no triggered level is programmed, the

:TRIG? MAX

programmable triggered current levels.

CURRent

and

commands.

CURR:TRIG? MIN

DEFault

’’ gives the minimum resolution of the

CURRent

level is returned.

return the highest and lowest

CURR

Chapter 4 Remote Interface Reference

Output Setting and Operation Commands

CURRent:PROTection {<current>|MINimum|MAXimum}

This command sets the current level at which the overcurrent protection (OCP) circuit will trip. If the peak output current exceeds the OCP level, then the output current is programmed to zero. The Questionable Status register ‘‘OC’’ bit is set (see page 103). An overcurrent condition can be cleared with the

CURR:PROT:CLE

is removed.

CURRent:PROTection? {MINimum|MAXimum}

T hi s q u er y r e tu r n s t h e o ve r c ur r en t p ro te c ti o n tr i p le v el p r e se n t ly p r og r am m e d .

CURR:PROT? MAX

programmable overcurrent trip levels.

CURRent:PROTection:STATe {0|1|OFF|ON}

This command enables or disables the overcurrent protection function of the power supply. An overcurrent condition can be cleared with the

CURR:PROT:CLE

removed. At

CURRent:PROTection:STATe?

This query returns the state of the overcurrent protection function. The returned parameter is ‘‘0’’ (OFF) or ‘‘1’’ (ON).

*RST

command after the condition that caused the OCP trip

and

CURR:PROT? MIN

command after the condition that caused the OCP trip is

, this value is set to ‘‘ON’’.

return the maximum and minimum

CURRent:PROTection:TRIPped?

Th is query ret urns a ‘‘1’’ if t he overcurr ent p rotection circuit is tr ipped and n ot cleared or a ‘‘0’’ if not tripped.

CURRent:PROTection:CLEar

This command causes the overcurrent protection circuit to be cleared. After this command, the output current is restored to the state it was in before the current protection tripped and the OCP trip level remains unchanged to the value presently programmed. Before sending this command, lower the output current below the trip OCP point, or raise the OCP trip level above the output setting. Note that the overcurrent condition caused by an external source

must be removed first before proceeding this command.

Chapter 4 Remote Interface Reference

Output Setting and Operation Commands

VOLTage {<voltage>| MINimum | MAXimum|UP|DOWN}

This command programs the immediate voltage level of the power supply. The immediate level is the voltage value of the output terminals.

The

VOLTage

programmed value regardless of the output range presently selected. You can substitute ‘‘

the voltage parameter. selects the highest voltage values allowed for the selected range.

This command also increases or decreases the immediate voltage level using the ‘‘UP’’ or ‘‘

VOLTage:STEP

increment setting will cause an execution error -222 (Data out of range) when the maximum or the minimum rated voltage is exceeded.

command changes the output of the power supply to the newly

MINimum

MIN

’’ parameter by a predetermined amount. The command

DOWN

sets the amount of increase or decrease. Notice that a new

’’ or ‘‘

MAXimum

selects the lowest voltage values of ‘‘0’’ volts.

’’ in place of a specific value for

MAX

VOLTage Example

The following program segments show how to use the

VOLT DOWN VOLT:STEP

‘‘

VOLT:STEP 0.01

‘‘

VOLT UP

‘‘

VOLT:STEP 0.02

‘‘

VOLT DOWN

VOLTage? [MINimum | MAXimum]

This query returns the presently programmed voltage level of the power supply. programmable voltage levels for the selected range.

command to increase or decrease the output voltage with the command.

’’

VOLT? MAX

’’

and

VOLT? MIN

return the highest and lowest

Set the step size to 0.01 V

Increase the output voltage

Set the step size to 0.02 V

Decrease the output voltage

VOLT UP

Chapter 4 Remote Interface Reference

Output Setting and Operation Commands

VOLTage:STEP {<numeric value>|DEFault}

This command sets the step size for voltage programming with the and

VOLT DOWN

To set the step size to the minimum resolution, set the step size to ‘‘ The minimum resolution of the step size is approximately 0.36 mV (E3633A) and 0.95 mV (E3634A) respectively. The minimum resolution of your instrument. The immediate voltage level increases or decreases by the value of the step size. For example, the output voltage will increase or decrease 10 mV if the step size is 0.01.

This command is useful when you program the power supply to the allowed minimum resolution. At resolution.

VOLTage:STEP? {DEFault}

This query returns the value of the step size currently specified. The returned parameter is a numeric value. ‘‘ size in unit of volts.

VOLTage:TRIGgered {<voltage>| MINimum | MAXimum}

This command programs the pending triggered voltage level. The pending triggered voltage level is a stored value that is transferred to the output terminals when a trigger occurs. A pending triggered level is not affected by subsequent

commands. See the above example in the previous page.

returns the

VOLTage

, the step size is the value of the minimum

*RST

DEFault

commands.

VOLT:STEP? DEF

’’ gives the minimum resolution step

VOLT UP

DEFault

’’.

VOLTage:TRIGgered? [MINimum | MAXimum]

This query returns the triggered voltage level presently programmed. If no triggered level is programmed, the and

VOLT:TRIG? MIN

voltage levels.

VOLTage:PROTection {<voltage>|MINimum|MAXimum}

This command sets the voltage level at which the overvoltage protection (OVP) circuit will trip. If the peak output voltage exceeds the OVP level, then the power supply output is shorted by an internal SCR. The Questionable Status register ‘‘OV’’ bit is set (see page 103). An overvoltage condition can be cleared with the trip is removed.

VOLT:PROT:CLE

return the highest and lowest programmable triggered

command after the condition that caused the OVP

level is returned.

VOLT

VOLT:TRIG? MAX

Chapter 4 Remote Interface Reference

Output Setting and Operation Commands

VOLTage:PROTection? {MINimum|MAXimum}

This query returns the overvoltage protection trip level presently programmed.

VOLT:PROT? MAX

programmable overvoltage trip levels.

VOLTage:PROTection:STATe {0|1|OFF|ON}

This command enables or disables the overvoltage protection function. An overvoltage condition can be cleared with the after the condition that caused the OVP trip is removed. At set to ‘‘ON’’.

VOLTage:PROTection:STATe?

This query returns the state of the overvoltage protection function. The returned parameter is ‘‘0’’ (OFF) or ‘‘1’’ (ON).

VOLTage:PROTection:TRIPped?

This query returns a ‘‘1’’ if the overvoltage protection circuit is tripped and not cleared or a ‘‘0’’ if not tripped.

VOLTage:PROTection:CLEar

This command causes the overvoltage protection circuit to be cleared. After this command, the output voltage is restored to the state it was in before the protection feature occurred and the OVP trip level remains unchanged to the value presently programmed. Before sending this command, lower the output voltage below the trip OVP point, or raise the OVP trip level above the output setting. Note that the overvoltage condition caused by an external source must

be removed first before proceeding this command.

and

VOLT:PROT? MIN

return the maximum and minimum

, this value is

*RST

command

VOLT:PROT:CLE

VOLTage:RANGe {P8V|P20V||LOW|HIGH} (For E3633A model)

This com ma nd sel ec ts a n ou tpu t ra ng e to be pr og ra mm ed b y t he id en tifi er . For example, when 8V/20A* range is selected, the maximum programmable voltage and current are limited to 8.24 volts and 20.60 amps. When 20V/10A* range is selected, the maximum programmable voltage and current are limited to 20.60 volts and 10.30 amps. See page 82 for more details of the programming ranges of the Agilent E3634A model. ‘‘P20V’’* or ‘‘HIGH’’ is the identifier for the 20V/10A* range and ‘‘P8V’’* or ‘‘LOW’’ is for the 8V/20A* range. At

*For Agilent E3633A Model **For Agilent E3634A Model

, the 8V/20A* or 25V/7A** range is selected.

*RST

or {P25V|P50V|LOW|HIGH} (For E3634A model)

Chapter 4 Remote Interface Reference

Output Setting and Operation Commands

VOLTage:RANGe?

This query returns the currently selected range. The returned parameter for the Agilent E3633A is ‘‘P20V’’ (HIGH) or ‘‘P8V’’ (LOW) and the parameter for the Agilent E3634A is ‘‘P50V’’ (HIGH) or ‘‘P25V’’ (LOW).

MEASure:CURRent?

This command queries the current measured across the current sense resistor inside the power supply.

MEASure[:VOLTage]?

This command queries the voltage measured at the sense terminals of the power supply.

Chapter 4 Remote Interface Reference

Triggering Commands

The power supply’s triggering system allows a change in voltage and current when receiving a trigger, to select a trigger source, and to insert a trigger. Triggering the power supply is a multi-step process.

• First, you must specify the source from which the power supply will accept the trigger. The power supply will accept a bus (software) trigger or an immediate trigger from the remote interface.

• Then, you can set the time delay between the detection of the trigger on the specified trigger source and the start of any corresponding output change.

Notice that the time delay is valid for only the bus trigger source.

• Finally, you must provide an source is selected, the selected output is set to the triggered level immediately. But if the trigger source is the bus, the power supply is set to th e t ri g g e re d le v e l a ft e r re c e iv in g th e G ro u p Ex e c ut e T r i gg e r (G ET ) or command.

INITiate

Trigger Source Choices

You must specify the source from which the power supply will accept a trigger. T he tr i gg e r is st or e d i n v ol a ti l e me m o r y; t h e s o u rc e is s e t t o b us wh e n th e po w e r supply has been off or after a remote interface reset.

command. If the

IMMediate

*TRG

Bus (Software) Triggering

• To select the bus trigger source, send the following command.

TRIG:SOUR BUS

• To trigger the power supply from the remote interface (GPIB or RS-232) after selecting the bus source, send the

is sent, the trigger action starts after the specified time delay if any

*TRG

delay is given.

• You can also trigger the power supply from the GPIB interface by sending the IEEE-488 Group Execute Trigger (GET) message. The following statement shows how to send a GET from a Agilent Technologies controller.

TRIGGER 705

(group execute trigger)

(tr igger) comma nd. When the

*TRG

Chapter 4 Remote Interface Reference

Triggering Commands

• To ensure synchronization when the bus source is selected, send the (wait) command. When the waits for all pending operations to complete before executing any additional commands. For example, the following command string guarantees that the first trigger is accepted and is executed before the second trigger is recognized.

TRIG:SOUR BUS;*TRG;*WAI;*TRG;*WAI

• You can use the (operation complete) command to signal when the operation is complete. The

*OPC?

is complete. The Event register when the operation is complete.

Immediate Triggering

• To select the immediate trigger source, send the following command.

TRIG:SOUR IMM

• When the command immediately transfers the

VOLT

CURR

*OPC?

command returns ‘‘1’’ to the output buffer when the operation

IMMediate

value. Any delay is ignored.

(operation complete query) command or the

command sets the ‘‘OPC’’ bit (bit 0) in the Standard

*OPC

is selected as a trigger source, an

command is executed, the power supply

*WAI

INITiate

VOLT:TRIG

CURR:TRIG

value to

*WAI

*OPC

Chapter 4 Remote Interface Reference

Triggering Commands

INITiate

This command causes the trigger system to initiate. This command completes one full trigger cycle when the trigger source is an immediate and initiates the trigger subsystem when the trigger source is bus.

TRIGger:DELay {<seconds>| MINimum | MAXimum}

This command sets the time delay between the detection of an event on the specified trigger source and the start of any corresponding trigger action on the power supply output. Select from 0 to 3600 seconds.

= 3600 seconds. At

MAX

TRIGger:DELay?

This command queries the trigger delay.

TRIGger:SOURce {BUS | IMMediate}

This command selects the source from which the power supply will accept a trigger. The power supply will accept a bus (software) trigger or an internal immediate trigger. At

*RST

, this value is set to 0 seconds.

*RST

, the bus trigger source is selected.

= 0 seconds.

MIN

TRIGger:SOURce?

This command queries the present trigger source. Returns ‘‘BUS’’ or ‘‘IMM’’.

*TRG

This command generates a trigger to the trigger subsystem that has selected a bus (software) trigger as its source the same effect as the Group Execute Trigger (GET) command. For RS-232 operation, make sure the power supply is in the remote interface mode by sending the

SYST:REM

command first.

(TRIG:SOUR BUS)

. The command has

Chapter 4 Remote Interface Reference

System-Related Commands

DISPlay {OFF | ON}

This command turns the front-panel display off or on. When the display is turned off, outputs are not sent to the display and all annunciators are disabled except the

The display state is automatically turned on when you return to the local mode. Press (

DISPlay?

This command queries the front-panel display setting. Returns ‘‘0’’ (OFF) or ‘‘1’’ (ON).

DISPlay:TEXT <quoted string>

This command displays a message on the front panel. The power supply will display up to 12 characters in a message; any additional characters are truncated. Commas, periods, and semicolons share a display space with the preceding character, and are not considered individual characters.

ERROR annunciator.

Store

Local) key to return to the local state from the remote interface.

Local

DISPlay:TEXT?

T hi s c om m an d q ue r ie s th e m es sa ge se nt to th e f r on t p an e l a n d r et ur n s a qu ot e d string.

DISPlay:TEXT:CLEar

This command clears the message displayed on the front panel.

OUTPut {OFF | ON}

This command enables or disables the outputs of the power supply. When the output is disabled, the voltage value is 0 V and the current value is 1 mA. At

, the output state is OFF.

*RST

OUTPut?

This command queries the output state of the power supply. The returned value is ‘‘0’’ (OFF) or ‘‘1’’ (ON).

Chapter 4 Remote Interface Reference

System-Related Commands

OUTPut:RELay {OFF | ON}

This command sets the state of two TTL signals on the RS-232 connector. These signals are intended for use with an external relay and relay driver. The TTL output is available on the RS-232 connector pin 1 and pin 9. When the

OUTPut:RELay

9 is low (0.5 V). The levels are reversed when the ‘‘OFF’’. At

Note TTL output of pin 1 or pin 9 of the RS-232 connector is available only after installing

two jumpers inside the power supply. See the Service Guide for more information.

Note 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.

OUTPut:RELay?

This command returns the state of the TTL relay logic signals. See also

OUTP:REL

SYSTem:BEEPer

This command issues a single beep immediately.

state is ‘‘ON’’, the TTL output of pin 1 is high (4.5 V) and pin

OUTPut:RELay

, the

*RST

command.

OUTPut:RELay

state is OFF.

state is

SYSTem:ERRor?

This command queries the power supply’s error queue. When the front-panel

ERROR annunciator turns on, one or more command syntax or hardware

errors have been detected. Up to 20 errors can be stored in the error queue.

See ‘‘Error Messages’’ for a complete listing of the errors in chapter 5.

• Errors are retrieved in first-in-first-out (FIFO) order. The first error returned is the first error that was stored. When you have read all errors from the queue, the time an error is generated.

• If more than 20 errors have occurred, the last error stored in the queue (the most recent error) is replaced with -350, ‘‘Too many errors’’. 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’’.

• The error queue is cleared when power has been off or after a status) command has been executed. The clear the error queue.

ERROR annunciator turns off. The power supply beeps once each

(clear

*CLS

(reset) command does not

*RST

Chapter 4 Remote Interface Reference

System-Related Commands

SYSTem:VERSion?

This command queries the power supply to determine the present SCPI version. The returned value is of a string in the form YYYY.V where the ‘‘Y’s’’ represent the year of the version, and the ‘‘V’’ represents a version number for that year (for example, 1996.0).

*IDN?

This query command reads the power supply’s identification string. The power supply returns four fields separated by commas. The first field is the manufacturer’s name, the second field is the model number, the third field is not used (always ‘‘0’’), and the fourth field is a revision code which contains three numbers. The first number is the firmware revision number for the main power supply processor; the second is for the input/output p rocesso r; and the third is for the front-panel processor.

The command returns a string with the following format (be sure to dimension a string variable with at least 40 characters):

HEWLETT-PACKARD,E3633A or E3634A,0,X.X-X.X-X.X

*RST

This command resets the power supply to its power-on state as follows:

Command E3633A state E3634A state

CURR

CURR:STEP

CURR:TRIG

CURR:PROT

CURR:PROT:STAT

DISP

OUTP

OUTP:REL

TRIG:DEL

TRIG:SOUR

VOLT

VOLT:STEP

VOLT:TRIG

VOLT:PROT

VOLT:PROT:STAT

VOLT:RANG

20 A 7 A

0.32 mA (typical value) 0.13 mA (typical value)

20 A 7 A

22.0 A 7.5 A

ON ON

OFF OFF

BUS BUS

0 V 0 V

0.36 mV (typical value) 0.95 mV (typical value)

0 V 0 V

22.0 V 55.0 V

ON ON

P8V (Low) P25V (Low)

Chapter 4 Remote Interface Reference

System-Related Commands

*TST?

This query performs a complete self-test of the power supply. Returns ‘‘0’’ if the self-test passes or ‘‘1’’ or any non-zero value if it fails. If the self-test fails, an error message is also generated with additional information on why the test failed.

*SAV { 1 | 2 | 3 }

This command stores the present state of the power supply to the specified location in non-volatile memory. Three memory locations (numbered 1, 2 and

3) are available to store operating states of the power supply. The state storage

feature ‘‘remembers’’ the states or values of the following commands:

CURR, CURR:STEP, CURR:TRIG, CURR:PROT, CURR:PROT:STAT DISP, OUTP, OUTP:REL, TRIG:DEL, TRIG:SOUR, VOLT, VOLT:STEP, VOLT:TRIG, VOLT:PROT, VOLT:PROT:STAT, VOLT:RANG

To recall a stored state, you must use the same memory location used previously to store the state.

and

*RCL { 1 | 2 | 3 }

This command recalls a previously stored state. To recall a stored state, you must use the same memory location used previously to store the state.

Note DISP {OFF|ON} can be stored and recalled in remote interface mode only. Going

to local mode automatically sets the display state to ON.

Chapter 4 Remote Interface Reference

Calibration Commands

See chapter 3 ‘‘Calibration Overview’’, starting on page 68 for an overview of the calibration features of the power supply. For more detailed discussion of the calibration procedures, see the Service Guide.

Note When you calibrate the power supply, you should not set the OVP and OCP to ON

state in order to prevent OVP or OCP from tripping.

CALibration:COUNt?

This command queries the power supply to determine the number of times it 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. Since the value increments by one for each calibration point, a complete calibration will increase the value by 5 counts.

CALibration:CURRent[:DATA] <numeric value>

This command can only be used after calibration is unsecured and the output state is ON. It enters a current value that you obtained by reading an external meter. You must first select the minimum calibration level (

) for the value being entered. You must then select the middle and

MIN

maximum calibration levels ( ) for the value being entered. Three successive values must be selected and entered. The power supply then computes new calibration constants. These constants are then stored in non-volatile memory.

CAL:CURR:LEV MID

and

CAL:CURR:LEV

CAL:CURR:LEV MAX

CALibration:CURRent:LEVel {MINimum | MIDdle|MAXimum}

This command can only be used after calibration is unsecured and the output state is ON. It sets the power supply to a calibration point that is entered with

CAL:CURR

low-end point (MIN) must be selected and entered first.

CALibration:CURRent:PROTection

This command calibrates the overcurrent protection circuit of the power supply. It takes about 10 seconds to execute the command. The calibration must be unsecured and the output shorted before calibrating the overcurrent protection. The power supply automatically performs the calibration and stores the new overcurrent constant in nonvolatile memory. Notice that

current calibration precedes before sending this command.

command. During calibration, three points must be entered and the

Chapter 4 Remote Interface Reference

Calibration Commands

CALibration:DAC:ERRor

This command corrects the differential nonlinearity error of the internal DAC without an external meter. You must send this command before calibrating the voltage. It takes about 30 seconds to execute the command.

CALibration:SECure:CODE <new code>

This command enters a new security code. To change the security code, first unsecure the power supply using the old security code. Then, enter the new code. The calibration code may contain up to 12 characters over the remote interface but the first character must always be a letter.

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

This command unsecures or secures the power supply for calibration. The calibration code may contain up to 12 characters over the remote interface.

CALibration:SECure:STATe?

This command queries the secured state for calibration of the power supply. The returned parameter is ‘‘0’’ (OFF) or ‘‘1’’ (ON).

CALibration:STRing <quoted string>

This command records calibration information about your power supply. For example, you can store such information as the last calibration date, the next calibration due date, or the power supply’s serial number. The calibration message may contain up to 40 characters. The power supply should be unsecured before sending a calibration message.

CALibration:STRing?

This command queries the calibration message and returns a quoted string.

CALibration:VOLTage[:DATA] <numeric value>

This command can only be used after calibration is unsecured and the output state is ON. It enters a voltage value that you obtained by reading an external meter. You must first select the minimum calibration level (

) for the value being entered. You must then select the middle and

MIN

maximum calibration levels ( for the value being entered. Three successive values must be selected and entered. The power supply then computes new voltage calibration constants. These constants are then stored in non-volatile memory.

CAL:VOLT:LEV MID

a nd

CAL:VOLT:LEV

CAL:VOLT:LEV MAX

)

Agilent Technologies E3634A, E3633A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

The Front Panel at a Glance

Front-Panel Voltage and Current Limit Settings

Display Annunciators

The Rear Panel at a Glance

In This Book

Contents

General Information

Safety Considerations

Safety and EMC Requirements

Options and Accessories

Options

Accessories

Description

Installation

Initial Inspection

Cooling and Location

Input Power Requirements

Power-Line Cord

Power-Line Voltage Selection

Initial Operation

Preliminary Checkout

Power-On Checkout

Output Checkout

Voltage Output Checkout

Current Output Checkout

Front-Panel Operation

Front-Panel Operation Overview

Constant Voltage Operation

Constant Current Operation

Storing and Recalling Operating States

Programming Overvoltage Protection

Setting the OVP Level and Enable the OVP Circuit

Checking OVP Operation

Clearing the Overvoltage Condition

Programming Overcurrent Protection

Setting the OCP Level and Enable the OCP Circuit

Checking OCP Operation

Clearing the Overcurrent Condition

Remote Voltage Sensing at the Front and Rear Terminals

CV Regulation

Output Rating

Output Noise

Stability

Remote Voltage Sensing Connections

Remote Voltage Sensing at the Rear Panel

Disabling the Output

Disabling 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 Overview

Calibration Security

Calibration Count

Calibration Message

Remote Interface Reference

SCPI Command Summary

Simplified Programming Overview

Using the APPLy Command