Agilent E3631A Operator Manual

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Page 1

User’s Guide

Part Number: E3631-90002 April 2000.

For Safety information, Warranties, and Regulatory information, see the pages behind the Index.

Agilent E3631A Triple Output DC Power Supply

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The Agilent E3631A is a high performance 80 watt-triple output DC power supply with GPIB and RS-232 interfaces. The combination of bench-top and system features in this power supply provides versatile solutions for your design and test requirements.

Convenient bench-top features

• Triple output

• Easy-to-use knob control for voltage and current settings

• Highly visible vacuum-fluorescent display for voltage and current meters

• Tracking operation for

• Excellent load and line regulation and low ripple and noise

• Operating states storage

• Portable, ruggedized case with non-skid feet

Flexible system features

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

• SCPI (Standard Commands for Programmable Instruments) compatibility

• I/O setup easily done from front-panel

25V outputs

Agilent E3631A Triple Output DC Power Supply

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The Front Panel at a Glance

1 Meter and adjust selection keys 2 Tracking enable/disable key 3 Display limit key 4 Recall operating state key 5 Store operating state/Local key 6 Error/Calibrate key

7 I/O Configuration / Secure key 8 Output On/Off key 9 Control knob 10 Resolution selection keys 11 Voltage/current adjust selection key

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Meter and adjust selection keys Select the output voltage and current of any one

supply (+6V, +25V, or -25V output) to be monitored on the display and allow knob adjustment of that supply.

2 Tracking enable / disable key Enables / disables the track mode of ±25V supplies.

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

allows knob adjustment for setting limit values.

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

location “1”, “2”, or “3”.

5 Store operating state / Local key

or “3” / or returns the power supply to local mode from remote interface mode.

6 Error / Calibrate key

and calibration / or enables calibration mode (the power supply must be unsecured before performing calibration).

Displays error codes generated during operations, self-test

7 I/O Configuration / Secure key

interfaces / or secure and unsecure the power supply for calibration.

Stores an operating state in location “1”, “2”,

Configures the power supply for remote

8 Output On/Off key Enables or disables all three power supply outputs. This key

toggles between two states.

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

clockwise or counter clockwise.

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

11 Voltage/current adjust selection key Selects the knob function to voltage control or

current control.

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.

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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 monitoring or limiting value of voltage or current

Note

Press the key after turning on the power supply.

Display Limit

2 Set the knob to the voltage control mode or current control mode using the

voltage/current adjust selection key.

3 Move the blinking digit to the appropriate position using the resolution selection keys.

4 Change the blinking digit to the desired value using the control knob.

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

display will go to the output monitor mode automatically to display the voltage and current at the output.

Output On/Off

All front panel keys and controls can be disabled with remote interface commands. The Agilent E3631A must be in “Local” mode for the front panel keys and controls to function.

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Display Annunciators

Adrs Power supply is addressed to listen or talk over a remote interface. Rmt Power supply is in remote interface mode. +6V Displays the output voltage and current for +6V supply. Knob is active for

+6V supply.

+25V Displays the output voltage and current for +25V supply. Knob is active for

-25V Displays the output voltage and current for -25V supply. Knob is active for

CAL power supply is in calibration mode. Track The outputs of +25V and -25V supplies are in track mode. Limit The display shows the voltage and current limit value of a selected supply. ERROR Hardware or remote interface command errors are detected and also the

OFF The three ouputs of the power supply are disabled. Unreg The displayed output is unregulated (output is neither CV nor CC). CV The displayed output is in constant-voltage mode. CC The displayed output is in constant-current mode.

+25V supply.

-25V supply.

error bit has not been.

To review the display annunciators, hold down key as you

Display Limit

turn on the power supply.

Page 7

The Rear Panel at a Glance

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

Use the front-panel key to:

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

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

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

I/O Config

4 Power-line module 5 GPIB (IEEE-488) interface connector 6 RS-232 interface connector

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In This Book

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

Initial Operation Chapter 2 ensures that the power supply develops its rated outputs and properly responds to operation from the front panel.

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

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

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

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

Tutorial Chapter 7 describes basic operation of linear power supplies and gives specific details on the operation and use of the Agilent E3631A 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.

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Page 10

Chapter 1 General Information

Safety Considerations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 15

Safety and EMC Requirements - - - - - - - - - - - - - - - - - - - - - - - - - 15

Options and Accessories - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16

Options - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16

Accessories- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 16 Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 17 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 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 31

Chapter 3 Front-Panel Operation

Contents

Front-Panel Operation Overview - - - - - - - - - - - - - - - - - - - - - - - - - 35 Constant Voltage Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 36 Constant Current Operation- - - - - - - - - - - - - - - - - - - - - - - - - - - - - 38 Tracking Operation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 40 Storing and Recalling Operating States - - - - - - - - - - - - - - - - - - - - 41 Disabling the Outputs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43 Knob Locking - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 43 System-Related Operations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44

Self-Test - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 44

Error Conditions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 45

Display Control - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 46

Firmware Revision Query - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47

SCPI Language Version - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 47

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Contents

Chapter 3 Front-Panel Operation (continued)

Remote Interface Configuration - - - - - - - - - - - - - - - - - - - - - - - - - - 48

Remote Interface Selection - - - - - - - - - - - - - - - - - - - - - - - - - - - - 48 GPIB Address - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49 Baud Rate Selection (RS-232) - - - - - - - - - - - - - - - - - - - - - - - - - - 49 Parity Selection (RS-232) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 49 To Set the GPIB Address - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 50

To Set the Baud Rate and Parity (RS-232) - - - - - - - - - - - - - - - - - 51 GPIB Interface Configuration - - - - - - - - - - - - - - - - - - - - - - - - - - - - 53 RS-232 Interface Configuration- - - - - - - - - - - - - - - - - - - - - - - - - - - 54

RS-232 Configuration Overview - - - - - - - - - - - - - - - - - - - - - - - - - 54

RS-232 Data Frame Format - - - - - - - - - - - - - - - - - - - - - - - - - - - - 54

Connection to a Computer or Terminal- - - - - - - - - - - - - - - - - - - 55

DTR/DSR Handshake Protocol - - - - - - - - - - - - - - - - - - - - - - - - - 56

RS-232 Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57 Calibration Overview - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 58

Calibration Security - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 58

Calibration Count - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 62

Calibration Message - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 62

Chapter 4 Remote Interface Reference

SCPI Command Summary - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 65 Simplified Programming Overview- - - - - - - - - - - - - - - - - - - - - - - - 70

Using the

Using the Low-Level Commands - - - - - - - - - - - - - - - - - - - - - - - - 70

Reading a Query Response- - - - - - - - - - - - - - - - - - - - - - - - - - - - - 71

Selecting a Trigger Source - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 71

Programming Ranges and Output Identifiers - - - - - - - - - - - - - - 72 Using the APPLy Command - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 73 Output Setting and Operation Commands - - - - - - - - - - - - - - - - - - 74

Output Selection Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - 74

Measurement Commands- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 76

Output On/Off and Tracking Operation Commands - - - - - - - - - 77

Output Setting Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 77 Triggering Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 79

Trigger Source Choices - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 79

Triggering Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 81

APPLy

Command - - - - - - - - - - - - - - - - - - - - - - - - - - - 70

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Contents

Chapter 4 Remote Interface Reference (continued) System-Related Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 82 Calibration Commands- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 85 RS-232 Interface Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - 87 The SCPI Status Registers - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 88

What is an Event Register? - - - - - - - - - - - - - - - - - - - - - - - - - - - - 88 What is an Enable Register? - - - - - - - - - - - - - - - - - - - - - - - - - - - 88 What is a Multiple Logical Output? - - - - - - - - - - - - - - - - - - - - - - 88 SCPI Status System - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 90 The Questionable Status Register - - - - - - - - - - - - - - - - - - - - - - - 91 The Standard Event Register - - - - - - - - - - - - - - - - - - - - - - - - - - - 93 The Status Byte Register - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 94 Using Service Request (SRQ) and Serial POLL- - - - - - - - - - - - - 95 Using *STB? to Read the Status Byte - - - - - - - - - - - - - - - - - - - - 96 Using the Message Available Bit (MAV) - - - - - - - - - - - - - - - - - - 96 To Interrupt Your Bus Controller Using SRQ - - - - - - - - - - - - - - 96 To Determine When a Command Sequence is Completed- - - - 97

Using *OPC to Signal When Data is in the Output Buffer - - - - 97 Status Reporting Commands - - - - - - - - - - - - - - - - - - - - - - - - - - - - 98 An Introduction to the SCPI Language - - - - - - - - - - - - - - - - - - - 102

Command Format Used in This Manual - - - - - - - - - - - - - - - - - 103

Command Separators - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 104

Using the MIN and MAX parameters- - - - - - - - - - - - - - - - - - - - 104

Querying Parameter Settings- - - - - - - - - - - - - - - - - - - - - - - - - - 105

SCPI Command Terminators- - - - - - - - - - - - - - - - - - - - - - - - - - 105

IEEE-488.2 Common Commands - - - - - - - - - - - - - - - - - - - - - - 105

SCPI Parameter Types - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 106 Halting an Output in Progress - - - - - - - - - - - - - - - - - - - - - - - - - - 107 SCPI Conformance Information- - - - - - - - - - - - - - - - - - - - - - - - - 108 IEEE-488 Conformance information - - - - - - - - - - - - - - - - - - - - - 111

Chapter 5 Error Messages

Contents

Execution Errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 115 Self-Test Errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 120 Calibration Errors - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 121

Page 13

Contents

Chapter 6 Application Programs

Agilent BASIC Programs - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 124 C and QuickBASIC Language Programs- - - - - - - - - - - - - - - - - - - 124 Using the APPLy Command - - - - - - - - - - - - - - - - - - - - - - - - - - - - 125 Using the Low-Level Commands - - - - - - - - - - - - - - - - - - - - - - - - 129 Using the Status Registers - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 133 RS-232 Operation Using QuickBASIC- - - - - - - - - - - - - - - - - - - - - 135

Chapter 7 Tutorial

Overview of Agilent E3631A Operation - - - - - - - - - - - - - - - - - - - 139 Output Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 141

Unregulated State - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 143 Unwanted Signals - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 143

Connecting the Load - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 145

Output Isolation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 145 Multiple Loads - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 145 Load Consideration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 146

Extending the Voltage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 148

Series Connections - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 148 Remote Programming - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 149 Reliability - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 151

Chapter 8 Specifications

Performance Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - 155 Supplemental Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - 157

Index - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -161

Declaration of Conformity - - - - - - - - - - - - - - - - - - - - - - -165

Page 14

General Information

Page 15

General Information

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.

Page 16

Chapter 1 General Information

Safety Considerations

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Page 17

Chapter 1

General Information

Options and Accessories

Options

Options 0EM, 0E3, and 0E9 determine which power-line voltage is selected at the factory. The standard unit is configured for 115 Vac ± 10%, 47-63 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 0EM 115 Vac ± 10%, 47-63 Hz input voltage 0E3 230 Vac ± 10%, 47-63 Hz input voltage

0E9 100 Vac ± 10%, 47-63 Hz input voltage 1CM Rack mount kit (Agilent part number 5062-3957) 0L2 Extra English manual set (local language manual files are included

on the CD-ROM, Agilent part number 5964-8251.)

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 GPIB cable, 1 m (3.3 ft.)

10833B GPIB cable, 2 m (6.6 ft.) 34398A RS-232, 9 pin (f) to 9 pin (f), 2.5 m (8.2 ft.) cable; plus 9 pin (m)

to 25 pin (f) adapter

34399A 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

Page 18

Chapter 1 General Information

Description

The Agilent E3631A power supply features a combination of programming capabilities and linear power supply performance that makes it ideal for power systems applications. The triple power supply delivers 0 to ± 25 V outputs rated at 0 to 1 A and 0 to +6 V output rated at 0 to 5 A. The ± 25V supplies also provide 0 to ± 25 V tracking output to power operational amplifiers and circuits requiring symmetrically balanced voltages. The 0 to ± 25V outputs track each other within ±(0.2% output + 20 mV) in the track mode. The ± 25V outputs can also be used in series as a single 0 to 50 V/1 A supply.

The voltage and current of each supply can be adjusted independently from the front panel or programmed over the GPIB or RS-232 interface. Using the front panel keys and the control knob, you can adjust the voltage and current of a selected output; enable or disable track mode; store and recall operating states; enable or disable three outputs; calibrate the power supply including changing the calibration security; return the power supply to local operating mode; and configure the power supply for remote interface operation.

From the front-panel VFD (vacuum-fluorescent display), you can monitor actual values of output voltage and current (meter mode) or voltage and current limit values (limit mode), check the operating status of the power supply from the annunciators, and check the type of error from the displayed error codes (messages).

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 outputs and to send the status data back over the GPIB or RS-232. Readback capabilities include reading back output voltage and current; present and stored status; and error messages. The following functions are implemented over the GPIB or RS-232:

• Voltage and current programming

• Voltage and current readback

• Enable or disable track mode

• Present and stored status readback

• Programming syntax error detection

• Voltage and current calibration

• Output on or off

• Self-test

Page 19

Chapter 1 General Information

Description

The front panel includes a VFD for displaying the output voltage and current. Two 4-digit voltage and current meters accurately show the actual or limit values of a selected supply simultaneously. Three meter selection keys choose the voltage and current of any one output to be monitored on the display.

Connections to the power supply's output and to chassis ground are made to binding posts on the front panel. The +25V and -25V supply's outputs share a common output terminal which is isolated from chassis ground. The positive and negative terminals of each output can be grounded, or each output can be kept within ±240 Vdc from the chassis ground. The power supply is shipped with a detachable, 3-wire grounding type power cord. The ac line fuse is an extractor type on the rear panel.

The power supply can be calibrated from the front panel directly or with a controller over the GPIB or RS-232 interface using calibration commands. Correction factors are stored in non-volatile memory and are used during output programming. Calibration from the front panel or a controller eliminates the need to remove the top cover or even the need to remove the power supply from your system cabinet. You can guard against unauthorized calibration by using the “Secured” calibration protection function.

Page 20

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.

Page 21

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 E3631A power supply.

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

Front Rear (bottom view)

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

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

Page 22

Chapter 1

General Information

Installation

To rack mount two instruments of the same depth side-by-side, order lock-link kit 5061-9694 and flange kit 5063-9214.

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

Page 23

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:

Page 24

Chapter 1 General Information

Input Power Requirements

1 Remove the power cord. Remove the

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

3 Rotate the power-line voltage selector until

the correct voltage appears.

2 Install the correct line fuse. Remove the

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

4 Replace the power-line voltage selector and

the fuse-holder assembly in the rear panel.

Page 25

Page 26

Initial Operation

Page 27

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.

Page 28

Chapter 2 Initial Operation

Preliminary Checkout

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

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

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

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

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

2.5 AT fuse. For 230 Vac operation, you must use a 2.0 AT fuse.

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

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

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 2.5 AT fuse, order Agilent part number 2110-0913. To replace the 2 AT fuse, order Agilent part number 2110-0982.

Page 29

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 All segments of the display including all annunciators will turn on

for about one second.

Output On/Off

To review the annunciators, hold down the key as you

Display Limit

turn on the power supply.

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

about one second.

ADDR 5 (or RS-232)

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

See ‘‘Remote Interface Configuration’’, for more information starting on page 48 in chapter 3 if you need to change the remote interface configuration.

3The “OFF” and “+6V” annunciators are on. All others are off.

The power supply will go into the power-on / reset state; all outputs are disabled (the OFF annunciator turns on); the display is selected for the +6V supply (the +6V annunciator turns on); and the knob is selected for voltage control.

4 Enable the outputs.

Press the

Output On/Off

key to enable the outputs. The OFF annunciator turns off and the +6V and CV annunciators are lit. The blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. “Meter mode” means that the display shows the actual output voltage and current.

Note

If the power supply detects an error during power-on self-test, the ERROR annunciator will turn on. See “Error Messages”, for more information starting on page 113 in chapter 5

Page 30

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.

Power

Output On/Off

1 Turn on the power supply.

2 Enable the outputs.

The OFF annunciator turns off and the +6V and CV annunciators are lit. The

blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. “Meter mode” means that the display shows the actual output voltage and current.

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

control for the +6V supply.

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 maximum

rated value.

Adjust the knob until the voltmeter indicates 0 volts and then adjust the knob until the voltmeter indicates 6.0 volts.

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

left when setting the voltage.

Page 31

Chapter 2 Initial Operation

Output Checkout

+25V

-25V

5 Check the voltage function for the +25V supply.

Select the meter and adjust selection key for the +25V supply. The CV annunciator is still lit and the +25V annunciator will turn on. Repeat steps (3) and (4) to check the voltage function for the +25V supply.

6 Check the voltage function for the -25V supply.

Select the meter and adjust selection key for the -25V supply. The CV annunciator is still lit and the -25V annunciator will turn on. Repeat steps (3) and (4) to check the voltage function for the -25V supply.

Page 32

Chapter 2 Initial Operation

Output Checkout

Current Output Checkout

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

Power

Output On/Off

Display Limit

Vol/Cur

1 Turn on the power supply.

2 Connect a short across (+) and (-) output terminals of the +6V

supply with an insulated test lead.

3 Enable the outputs.

The OFF annunciator turns off and the +6V annunciator turns on. The CV or CC annunciator is lit depending on the resistance of the test lead. The

blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. “Meter mode” means that the display shows the actual output voltage and current.

4 Adjust the voltage limit value to 1.0 volt.

Set the display to the limit mode (the Lmt annunciator will be blinking). Adjust the voltage limit to 1.0 volt to assure CC operation. The CC annunciator will light.

5 Check that the front-panel ammeter properly responds to knob control

for the +6V supply.

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

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Chapter 2 Initial Operation

Output Checkout

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

rated value.

Adjust the knob until the ammeter indicates 0 amps and then until the ammeter indicates 5.0 amps.

+25V

-25V

Note

7 Check the current function for the +25V supply.

Disable the outputs by pressing the key and connect a

Output On/Off

short across (+) and (COM) output terminals of the ±25V supply with an insulated test lead. Repeat steps (3) through (6) after selecting the meter and adjust selection key for the +25V supply.

8 Check the current function for the -25V supply.

Disable the outputs by pressing the key and connect a

Output On/Off

short across (-) and (COM) output terminals of +25V supply with an insulated test lead. Repeat steps (3) through (6) after selecting the meter and adjust selection key for the -25V supply.

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 113 in chapter 5

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

left when setting the current.

Page 34

Front-Panel Operation

Page 35

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 front-panel keys and show how they are used to accomplish power supply operation.

• Front-Panel Operation Overview, page 35

• Constant Voltage Operation, page 36

• Constant Current Operation, page 38

• Tracking Operation, page 40

• Storing and Recalling Operating States, page 41

• Disabling the Outputs, page 43

• Knob Locking, page 43

• System-Related Operations, page 44

• Remote Interface Configuration, page 48

• GPIB Interface Configuration, page 53

• RS-232 Interface Configuration, page 54

• Calibration Overview, page 58

Note

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

See “Error Messages”, starting on page 113 chapter 5 if you encounter any errors during front-panel operation

Page 36

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

Local

• When you press the key (the Lmt annunciator blinks), the display of the power supply goes to the limit mode and the present limit values of the selected supply 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 time-out after several seconds, the power supply will return the display to the meter mode (the Lmt annunciator turns off). In this mode, the actual output voltage and current will be displayed.

• All outputs of the power supply can be enabled or disabled from the front panel using the key. When the output of the power supply is off, the OFF annunciator turns on and the three outputs are 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 +6V supply is operating in CV mode and controlled from the front panel, then the CV and +6V annunciators will turn on. If, however, the power supply is remotely controlled, the Rmt annunciator will also turn on, and when the power supply is being addressed over GPIB interface, the Adrs annunciator will turn on. See ‘‘Display Annunciators’’ on page 5 for more information.

Display Limit

Output On/Off

Page 37

Chapter 3 Front-Panel Operation

Constant Voltage Operation

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

1 Connect a load to the desired output terminals.

With power-off, connect a load to the desired output terminals.

Power

Output

Display

On/Off

Limit

2 Turn on the power supply.

3 Enable the outputs.

The OFF annunciator turns off and the +6V and CV annunciators are lit. The

blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. “Meter mode” means that the display shows the actual output voltage and current.

To set up the power supply for +25V supply or -25V supply operation, you should press the or key to select the display and adjust

+25V -25V

for +25V supply or -25V supply before proceeding to the next step.

4 Set the display for the limit mode.

Notice that the Lmt annunciator blinks, indicating that the display is in the limit mode. When the display is in the limit mode, you can see the voltage and current limit values of the selected supply.

In constant voltage mode, the voltage values between the meter mode and limit mode are the same, but the current values are not. Further 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.

Page 38

Chapter 3 Front-Panel Operation

Constant Voltage Operation

Vol

Cur

Vol

Cur

Display

Limit

5 Adjust the knob for the desired current limit.

Check that the Lmt annunciator still blinks. Set the knob for current control. The second digit of ammeter will be blinking. Adjust the knob to the desired current limit.

6 Adjust the knob for the desired output voltage.

Set the knob for voltage control. The second digit of the voltmeter will be blinking. Adjust the knob to the desired output voltage.

7 Return to the meter mode.

Press the key or let the display time-out after several

Display Limit

seconds to return to the meter mode. Notice that the Lmt annunciator turns off and the display returns to the meter mode. In the meter mode, the display shows the actual output voltage and current of the selected supply.

8 Verify that the power supply is in the constant voltage mode.

If you operate the +6V supply in the constant voltage (CV) mode, verify that CV and +6V annunciators are lit. If you operate the power supply for the +25V supply or the -25V supply, the +25V or -25V annunciator will turn on. If the CC annunciator is lit, choose a higher current limit.

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.

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

left when setting the voltage and current.

Page 39

Chapter 3 Front-Panel Operation

Constant Current Operation

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

1 Connect a load to the output terminals of the desired supply.

With power-off, connect a load to the desired output terminals.

Power

Output On/Off

Display Limit

2 Turn on the power supply.

3 Enable the outputs.

The OFF annunciator turns off and the +6V and CV annunciators are lit. The

blinking digit can be adjusted by turning the knob. Notice that the display is in the meter mode. “Meter mode” means that the display shows the actual output voltage and current.

To set up the power supply for +25V supply or -25V supply operation, you should press the or key to select the display and adjust for +25V

+25V -25V

supply or -25V supply before proceeding to the next step.

4 Set the display for the limit mode.

In constant current mode, the current values between the meter mode and limit mode are the same, but the voltage values are not. Further 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.

Page 40

Chapter 3 Front-Panel Operation

Constant Current Operation

Vol/Cur

Display Limit

Note

5 Adjust the knob for the desired voltage limit.

Check that the knob is still selected for voltage control and the Lmt annunciator blinks. Adjust the knob for the desired voltage limit.

6 Adjust the knob for the desired output current.

Set the knob for current control. The second digit of the ammeter will be blinking. Adjust the knob to the desired current output.

7 Return to the meter mode.

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

Display Limit

to return the meter mode. Notice that the Lmt annunciator turns off and the display retur ns to the meter mode. In the meter mode, the display shows the actual output voltage and current of the selected supply.

8 Verify that the power supply is in the constant current mode.

If you operate the +6V supply in the constant current (CC) mode, verify that CC an d +6V annunciators are lit. If you operate the power supply for the +25V supply or the -25V supply, the +25V or -25V annunciator will turn on. If the CV annunciator is lit, choose a higher voltage limit.

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

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

right or left when setting the voltage and current.

Page 41

Chapter 3 Front-Panel Operation

Tracking Operation

The ±25V supplies provide 0 to ±25 V tracking outputs. In the track mode, two voltages of the ±25V supplies track each other within ±(0.2% output +20 mV) for convenience in varying the symmetrical voltages needed by operational amplifiers and other circuits using balanced positive and negative inputs. The state of track mode is stored in volatile memory; the track is always off state when power has been off or after a remote interface reset.

To operate the power supply in the track mode, proceed as follows:

1 Set the +25V supply to the desired voltage as described in previous

section “Constant Voltage Operation”(see page 36 for detailed information).

Track

2 Enable the track mode.

Track

The key must be depressed for at least 1 second to enable the track mode. When the track mode is first enabled, the -25V supply will be set to the same voltage level as the +25V supply. Once enabled, any change of the voltage level in either the +25V supply or the -25V supply will be reflected in other supply. The current limit is independently set for each of the +25V or the -25V supply and is not affected by the track mode.

3 Verify that the ±25V supplies track each other properly.

You can verify that the voltage of the -25V supply tracks that of the +25V supply within ±(0.2% of output + 20 mV) from the front-panel display by comparing the voltage values of the +25V supply and the -25V supply.

In the track mode, if the CC annunciator is lit when the display is selected for the +25V supply, choose a higher current limit for the +25V supply. If the CC annunciator is lit when the display is selected for the -25V supply, choose a higher current limit for the -25V supply.

Page 42

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 from the factory for front panel operation with the following states: display and knob selection for +6V

output; disabled; and track off state.

and 0 V and 1 A for the ±25V supplies.

The following steps show you how to store and recall an operating state.

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

The storage feature “remembers” the display and knob selection state, the limit values of voltage and current for three outputs, output on/off state, and track on/off state.

values of voltage and current limits for three outputs; output

*RST

values for +6V supply are 0 V and 5 A

*RST

Store

2 Turn on the storage mode.

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

STORE 1

This message appears on the display for approximately 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.

Store

Page 43

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

This message appears on the display for approximately 1 second.

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 a key

Recall

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

Recall

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.

DONE

This message appears on the display for approximately 1 second.

Page 44

Chapter 3 Front-Panel Operation

Disabling the Outputs

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Page 45

Chapter 3 Front-Panel Operation

System-Related Operations

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

Self-Test

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

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

• Front-panel operation:

The complete self-test is enabled by pressing the key (actually any front panel keys except the key) and the power-line switch

Error

simultaneously and then continuing to press the key for 5

Recall

seconds. The complete self-test will be finished in 2 more seconds.

• Remote interface operation:

*TST?

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

Page 46

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 113 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. 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 clear the error queue.

• Front-panel operation:

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

ERROR -113

• Remote interface operation:

SYSTem:ERRor?

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

Reads one error from the error queue

(reset) command does not

*RST

Error

*CLS

(clear

-113,"Undefined header"

Page 47

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 ERROR annunciator. Front-panel operation is otherwise unaffected by turning off the display.

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

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

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

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

Local

from the remote interface

• Remote interface operation:

DISPlay {OFF|ON}

DISPlay:TEXT

DISPlay:TEXT:CLEar

Disable / enable the display

Display the string enclosed in quotes

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’"

Page 48

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?

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

Returns “

HEWLETT-PACKARD,E 3631A,0, X.X-X.X-X .X

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:

SYSTem: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, 1995.0).

”

Page 49

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 chapter 4 “Remote Interface Reference”, starting on page 63.

Remote Interface Selection

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

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

• The interface selection is stored in non-volatile memory, 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 53 for more information on connecting the power supply to a computer over the GPIB interface.

Refer to "RS-232 Interface Configuration" starting on page 54 for more information on connecting the power supply to a computer over the RS-232 interface.

Page 50

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 memo ry, 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 bits), Even (7 data bits), or Odd (7 data bits). When you set the parity, you are indirectly setting the number of data bits.

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

Page 51

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:

I/O Config

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 default setting. If “RS-232” appears, choose “GPIB / 488” by turning the knob to the right.

2 Select the GPIB address.

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 default setting.

3 Turn the knob to change the GPIB address.

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

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

CHANGE SAVED

Note

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

To cancel the I/O configuration mode without any changes during the GPIB address selection, press the “I/O Config” key until the “NO CHANGE” message is displayed.

Page 52

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:

I/O Config

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 default 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 Select the RS-232 interface and choose the baud rate.

9600 BAUD

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

I/O Config

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.

Page 53

Chapter 3 Front-Panel Operation

Remote Interface Configuration

I/O Config

Note

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

CHANGE SAVED

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

To cancel the I/O configuration mode without any changes during the baud rate and parity selection, press the “I/O Config” key until the “NO CHANGE” message is displayed.

Page 54

Chapter 3 Front-Panel Operation

GPIB Interface Configuration

The GPIB connector on the rear panel connects your power supply to the computer and other GPIB devices. Chapter 1 lists the cables that are available from Agilent Technologies. An 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.

Page 55

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 87.

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 51 for more information to configure from the front panel).

I/O Config

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

• Parity and Data Bits: None / 8 data bits (factory setting) Even / 7 data bits, or Odd / 7 data bits

• Number of Start Bits: 1 bit (fixed)

• Number of Stop Bits: 2 bits (fixed)

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.

Page 56

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, 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.

Instrument

DCD RX TX DTR

GND DSR RTS CTS RI

DB9 Male

1 2 3 4

5 6 7 8 9

DB9 Female

5182-4794

Cable

1 2 3 4

5 6 7 8 9

DB9 Female

DCD RX TX DTR

GND DSR RTS CTS RI

DB9 Male

Page 57

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.

5182-4794

Instrument PC

DCD

DTR

GND

DSR

RTS

CTS

DB9

Female

Male

Cable

1 2 3 4

5 6 7 8 9

DB9 Female

1 2 3 4

5 6 7 8 9

DB9 Male

5181-6641

Adapter

2 3 4 5

6 7 8 20

DB25 Female

TX RX RTS CTS

DSR GND DCD DTR

DB25 Male

DTR/DSR Handshake Protocol

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

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

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

1 When the power supply’s input buffer is full (when approximately 100

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

Page 58

Chapter 3 Front-Panel Operation

RS-232 Interface Configuration

2 When the power supply wants to “talk” over the interface (which means that

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

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

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

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

RS-232 Troubleshooting

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

• Verify that the power supply and your computer are configured for the same baud rate, parity, and number of data bits. Make sure that your computer is set up for 1 start bit and 2 stop bits (these values are fixed on the power supply).

• Make sure to execute the power supply in the remote mode.

• Verify that you have connected the correct interface cable and adapters. Even if the cable has the proper connectors for your system, the internal wiring may be incorrect. The 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

Page 59

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 “HP003631” when the power supply is shipped

from the factory. The security code is stored in non-volatile memory, and does not change when power has been off or after a remote interface reset.

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

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

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

the power supply from the front panel, omit the “H P” and enter the remaining numbers as shown on the following

H P _ _ _ _ _ _ (8 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.

Page 60

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 “HP003631”.

• Front-Panel Operation

SECURED

If the power supply is secured, you will see the above message for one second by holding the the power supply. To unsecure the power supply, press the key

Calibrate

key for 5 seconds when you turn on

Secure

after the “CAL MODE” message is displayed in the calibration mode, enter the security code using the knob and resolution selection keys, and then press the key.

Secure

000000 CODE

When you press the key to save the change, you will see the

Secure

message below for one second if the security code is correct. The unsecured setting is stored in non-volatile memory, and does not change when power has been off or after a remote interface reset. To exit the

calibration mode, turn the power off and on.

Notice that if the security is incorrect, the power supply returns to the code entering mode for you to enter the correct code.

UNSECURED

• Remote Interface Operation:

CALibrate:SECure:STATe, {OFF|ON},

<code>

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

"CAL:SEC:STAT OFF, HP003631"

Page 61

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 “HP003631”.

Be sure to read the security code rules on page 58 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 the key for 5 seconds when you turn on the power supply. To secure the power supply, press the key

Calibrate

Secure

after the “CAL MODE” message is displayed in the calibration mode, enter the security code using the knob and resolution selection keys, and then press key.

Secure

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

000000 CODE

When you press the key to save the change, you will see the

Secure

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

SECURED

• Remote Interface Operation:

CALibrate:SECure:STATe {OFF|ON},

<code>

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

"CAL:SEC:STAT ON, HP003631"

Page 62

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 58 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 the key after the “CAL MODE” message is displayed in the calibration mode, enter the new security code using the knob and resolution selection keys, then press the key.

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

• Remote Interface Operation:

Secure

CALibrate:SECure: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, HP003631"

"CAL:SEC:CODE ZZ001443"

"CAL:SEC:STAT ON, ZZ00143"

Unsecure with old code

Enter new code

Secure with new code

Page 63

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 6 counts.

• Remote Interface Operation:

CALibrate:COUNt?

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:

CALibrate:STRing

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

"CAL:STR 'CAL 05-1-95'"

Store the cal message

Page 64

Remote Interface Reference

Page 65

Remote Interface Reference

• SCPI Command Summary, page 65

• Simplified Programming Overview, page 70

• Using the APPLy Command, page 73

• Output Setting and Operation Commands, page 74

• Triggering Commands, page 79

• System-Related Commands, page 82

• Calibration Commands, page 85

• RS-232 Interface Commands, page 87

• The SCPI Status Registers, page 88

• Status Reporting Commands, page 98

• An Introduction to the SCPI Language, page 102

• Halting an Output in Progress, page 107

• SCPI Conformance Information, page 108

• IEEE-488 Conformance Information, page 111

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.

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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.

First-time SCPI users, see

page 102

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Output Setting and Operation Commands

APPLy

{P6V|P25V|N25V}[,{<

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

APPLy? [{P6V|P25V|N25V}]

INSTrument

[:SELect] {P6V|P25V|N25V}

[:SELect]?

:NSELect {1|2|3}

:NSELect?

:COUPle[:TRIGger] {ALL|NONE|

<list>}

:COUPle[:TRIGger]?

MEASure

:CURRent[:DC]? [{P6V|P25V|N25V}]

[:VOLTage][:DC]? [{P6V|P25V|N25V}]

OUTPut

[:STATe] {OFF|ON}

[:STATe]?

:TRACk[:STATe] {OFF|ON}

:TRACk[:STATe]?

[SOURce:]

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

CURRent[:LEVel][:IMMediate][:AMPLitude]?[MIN|MAX] CURRent[:LEVel]:TRIGgered[:AMPLitude] {<

CURRent[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX] VOLTage[:LEVel][:IMMediate][:AMPLitude] {<

VOLTage[:LEVel][:IMMediate][:AMPLitude]?[MIN|MAX] VOLTage[:LEVel]:TRIGgered[:AMPLitude] {<

VOLTage[:LEVel]:TRIGgered[:AMPLitude]? [MIN|MAX]

current

>|DEF|MIN|MAX}]]

current>[MIN|MAX}

voltage>|MIN|MAX}

voltage>[MIN|MAX}

Triggering Commands

INITiate [:IMMediate]

TRIGger[:SEQuence]

:DELay {<seconds>|MIN|MAX}

:DELay?

:SOURce {BUS|IMM}

:SOURce?

*TRG

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System-Related Commands

DISPlay[:WINDow]

[:STATe] {OFF|ON}

[:STATe]?

:TEXT[:DATA] <

:TEXT[:DATA]?

:TEXT:CLEar

SYSTem

:BEEPer[:IMMediate]

:ERRor?

:VERSion?

*IDN?

*RST

*TST?

*SAV {1|2|3}

*RCL {1|2|3}

quoted string>

Calibration Commands

CALibration

:COUNt?

:CURRent[:DATA] <

:CURRent:LEVel {MIN|MAX}

:SECure:CODE <

:SECure:STATe {OFF|ON},

:SECure:STATe?

:STRing <

:STRing?

:VOLTage[:DATA] <

:VOLTage:LEVel {MIN|MAX}

quoted string>

numeric value>

new code>

<code>

numeric value>

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Status Reporting Commands

STATus:QUEStionable

[:EVENt]?

:ENABle <

:ENABle?

:INSTrument[:EVENt]?

:INSTrument:ENABle <

:INSTrument:ENABle?

:INSTrument:ISUMmary<n>[:EVENt]?

:INSTrument:ISUMmary<n>:CONDition?

:INSTrument:ISUMmary<n>:ENABle <

:INSTrument:ISUMmary<n>:ENABle?

SYSTem:ERRor?

*CLS

*ESE <

enable value>

*ESE?

*ESR?

*OPC

*OPC?

*PSC {0|1}

*PSC?

*SRE <

enable value>

*SRE?

*STB?

*WAI

enable value>

RS-232 Interface Commands

SYSTem

:LOCal

:REMote

:RWLock

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SCPI Command Summary

IEEE-488.2 Common Commands

*CLS

*ESE <

*ESE?

*ESR?

*IDN?

*OPC

*OPC?

*PSC {0|1}

*PSC?

*RST

*SAV {1|2|3}

*RCL {1|2|3}

*SRE <

*SRE?

*STB?

*TRG

*TST?

*WAI

enable value>

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Simplified Programming Overview

First-time SCPI users, see page 102

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 program the power supply over the remote interface. For example, the following statement executed from your computer will set the +6V supply to an output of 3 V rated at 1 A:

"APPL P6V, 3.0, 1.0"

command provides the most straightforward method to

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 +6V supply to an output of 3 V rated at 1 A:

command provides the most straightforward method to

APPLy

"INST P6V"

"VOLT 3.0"

"CURR 1.0"

Select +6V output

Set output voltage to 3.0 V

Set output current to 1.0 A

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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

print statement

Dimension string array (80 elements)

Read error queu

Enter error string into computer

Print error string

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 “ selected. If you want the power supply to use an immediate internal trigger, you must select “ executed from your computer will set the +6V supply to an output of 3 V/1 A immediately:

"INST P6V"

"VOLT:TRIG 3.0" S

"CURR:TRIG 1.0"

"TRIG:SOUR IMM"

"INIT"

IMMediate

”. For example, the following statements

Select the +6V output

et 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

” trigger source is

BUS

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Simplified Programming Overview

Programming Ranges and Output Identifiers

Output setting commands require a parameter for programming ranges and an output name or an output number as the identifier of each output and most queries will return a parameter. The programming range for a parameter varies according to the selected output of the power supply. The following table lists the programming ranges, output names, and output numbers for each output.

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

Table 4-1. Agilent E3631A Programming Ranges and Output Identifiers

Output

+6V output +25V output -25V output

Voltage Programming

Current Programming

Output identifier P6V P25V N25V

Output number 12 3

Range

MAX value 6.18 V 25.75 V -25.75 V

MIN value 0 V 0 V 0 V

*RST value

(DEFault value)

Range

MAX value 5.15 A 1.03 A 1.03 A

MIN value 0 A 0 A 0 A

*RST value

(DEFault value)

0 to 6.18 V 0 to +25.75 V 0 to -25.75 V

0 V 0 V 0 V

0 to 5.15 A 0 to 1.03 A 0 to 1.03 A

5 A 1 A 1 A

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Using the APPLy Command

The

APPLy

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

APPLy {P6V | P25V | N25V}[,{<voltage>| DEF | MIN | MAX}[,{<current> | DEF | MIN | MA X}] ]

This command is combination of

VOLTage

the current of the specified output are changed as soon as the command is executed.

You can identify each output by the output name (P6V, P25V or N25V) as described in Table 4-1. For the voltage and current parameters of the command, the ranges depend on the output currently selected. You can substitute “MINimum”, “MAXimum”, or “DEFault” in place of a specific value for the voltage an d current parameters. MIN selects the lowest voltage and current values allowed for the selected output. MAX selects the highest voltage and current values allowed. The default voltage values are 0 volts for all outputs. The default current values are 5 A for +6V output and 1 A for ±25V outputs. The default voltage and current values are exactly the same as the

*RST

If you specify only one value for the parameter, the power supply regards it as voltage setting value. If you do not specify any value for the parameter, the

APPLy

INSTrument

command provides the most straightforward method to program

INSTrument:SELect

, and

[SOURce:]CURRent

values. See Table 4-1 for details of parameters.

command only selects the output specified and acts as the

command.

commands. The values of voltage and

, [

SOURce:

]

APPLy

APPLy? [{P6V | P25V | N25V}]

This command queries the power supply's present voltage and current values for each output 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). If any output identifier is not specified, the voltage and the current of the currently selected output are returned.

"5.000000,1.000000"

In the above string, the first number 5.000000 is the voltage limit value and the second number 1.000000 is the current limit value for the specified output.

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Output Setting and Operation Commands

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

See page 102 for programming ranges, output identifiers, and MIN / MAX values in the following commands.

Output Selection Commands

INSTrument[:SELect] {P6V | P25V | N25V}

This command selects the output to be programmed among three outputs by the output identifier. The outputs of the power supply are considered three logical instruments. The identify and select an output. When one output is selected, the other outputs are unavailable for programming until selected. The commands which are affected by the (

SOURce

(

CALibration

output and “N25V” is for -25V output.

INSTrument

), measurement commands (

). “P6V” is the identifier for +6V output, “P25V” is for +25V

command provides the most straightforward

APPLy

INSTrument

command are output setting commands

command provides a mechanism to

MEASure

), and calibration commands

INSTrument[:SELect]?

This query returns the currently selected output by the [

:SELect

parameter is “P6V”, “P25V”, or “N25V”.

INSTrument:NSELect {1 | 2 | 3}

This command selects the output to be programmed among three outputs by a numeric value instead of the output identifier used in the [

:SELect

“3” selects -25V output.

INSTrument:NSELect?

This query returns the currently selected output by the

:NSELect

is “1” for +6V output, “2” for +25V output or “3” for -25V output.

] or

INSTrument:NSELect

] command. “1” selects +6V output, “2” selects +25V output, and

INSTrument[:SELect

command. The returned

] command. The returned parameter

INSTrument

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Output Setting and Operation Commands

INSTrument:COUPle[:TRIGger] {ALL | NONE |<list>}

This command defines a coupling between various logical outputs of the power supply. The couple command consists of an optional subsystem node followed by a single parameter. The only valid parameter for the optional subsystem node is command,

The parameter indicates to which logical outputs the specified coupling is to apply. “ALL” indicates that specified coupling is to apply to all outputs. “NONE” indicates that specified coupling is to be removed. A list of outputs specifies a particular set of logical outputs to be coupled. At outputs are uncoupled. Notice that

supplies can be coupled.

TRIGger

subsystem is assumed to be coupled.

subsystem. If no node follows the couple

, all

*RST

must be off before the ±25V

TRACk

INST:COUP Example (1)

Note If you select the bus trigger source in the above program (see page 79 for

The following program segment shows how to use the

COUPle

outputs with voltage and current triggered levels. The power supply is set to the newly programmed values as set by the

CURRent:TRIGgered

"INST:SEL P6V" "VOLT:TRIG 5" "CURR:TRIG 3" "INST:SEL P25V" "VOLT:TRIG 20" "CURR:TRIG 0.5" "INST:COUP P6V,P25V" "TRIG:SOUR IMM" "INIT"

the detailed information), you must send the *TRG or Group Execute Trigger (GET) command to start the trigger action after sending the INITiate command.

command to couple two outputs between the +6V and the +25V

VOLTage:TRIGgered

commands.

Select the +6V output Set triggered level to 5 V Set triggered level to 3 A Select the +25V output Set triggered level to 20 V Set triggered level to 0.5 A Couple the +6V and +25V supply Set trigger to immediate Trigger the power supply to output the trigger values for the +6V and the +25V supplies

INSTrument:

and

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Output Setting and Operation Commands

INSTrument:COUPle[:TRIGger]?

This query returns the currently coupled output. Returns “ALL”, “NONE”, or a list. If any output is not coupled, “NONE” is returned. If all of three outputs are coupled, “ALL” is returned. If a list of outputs is coupled, the list is returned.

Measurement Commands

MEASure:CURRent[:DC]? [{P6V | P25V | N25V}]

This command queries the current measured at the output terminals of the power supply. The physical outputs of measurement are specified by the output identifier. If any output identifier is not specified, the current of the currently selected output is returned.

MEASure[:VOLTage][:DC]? [{P6V | P25V | N25V}]

This command queries the voltage measured at the output terminals of the power supply. If any output identifier is not specified, the voltage of the currently selected output is returned.

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Output On/Off and Tracking Operation Commands

OUTPut[:STATe] {OFF | ON}

This command enables or disables all three outputs of the power supply. The state of the disabled outputs is a condition of less than 0.6 volts of opposite polarity with no load and less than 60 mA of opposite direction with a short circuit. At

OUTPut[:STATe]?

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

OUTPut:TRACk[:STATe] {OFF | ON}

This command enables or disables the power supply to operate in the track mode. When the track mode is first enabled, the -25V supply will be set to the same voltage level as the +25V supply. Once enabled, any change of the programmed voltage level in either +25V supply or -25V supply will be re fle c ted in th e oth er supply. The supply to the non-track mode. The ±25V supplies must not be coupled to enable “Track”. At

, the output state is off.

*RST

, the track mode is disabled.

*RST

TRACk OFF

command returns the power

OUTPut:TRACk[:STATe]?

This command queries the track mode state of the power supply. The returned value is “0” (OFF) or “1” (ON).

Output Setting Commands

[SOURce:]CURRent[:LEVel][:IMMediate][:AMPLitude] {<current>|MINimum | MAXimum}

This command directly programs the immediate current level of the power supply. The immediate level is the current limit value of the output selected with the

[SOURce:]CURRent[:LEVel][:IMMediate][:AMPLitude]? [MINimum | MAXimum]

This query returns the presently programmed current limit level of the selected output. the maximum and minimum programmable current levels of the selected output.

INSTrument

command.

CURRent? MAXimum

and

CURRent? MINimum

return

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Output Setting and Operation Commands

[SOURce:]CURRent[:LEVel]:TRIGgered[:AMPLitude] {<current>| MINimum | MAXimum}

This command programs the pending triggered current level of the power supply. 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

[SOURce:]CURRent[:LEVel]:TRIGgered[:AMPLitude]? [MINimum | MAXimum]

CURRent

commands.

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

:TRIGgered? MAXimum

and

CURRent:TRIGgered? MINimum

CURRent

level is returned.

CURRent

return the

maximum and minimum programmable triggered current levels.

VOLTage[:LEVel][:IMMediate][:AMPLitude] {<voltage>| MINimum | MAXimum}

This command directly programs the immediate voltage level of the power supply. The immediate level is the voltage limit value of the selected output with the

INSTrument

command.

[SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude]? [MINimum | MAXimum]

This query returns the presently programmed voltage limit level of the selected output.

VOLTage? MAXimum

and

VOLTage? MINimum

return the maximum and minimum programmable voltage levels of the selected output.

[SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPLitude] {<voltage>| MINimum | MAXimum}

This command programs the pending triggered voltage level of the power supply. 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

[SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPLitude]? [MINimum | MAXimum]

VOLTage

commands.

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

:TRIGgered? MAXimum

and

VOLTage:TRIGgered? MINimum

VOLTage

level is returned.

VOLTage

return

the maximum and minimum programmable triggered voltage levels.

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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 select an output with the command and then configure the power supply for the triggered output level by using commands.

• Then, 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

IMMediate

level immediately. But if the trigger source is the bus, the power supply is set to the triggered level after receiving the Group Execute Trigger (GET) or

*TRG

CURRent:TRIGgered

INITiate[:IMMediate]

source is selected, the selected output is set to the triggered

command.

INSTrument:SELect

and

VOLTage:TRIGgered

command. If the

Trigger Source Choices

You must specify the source from which the power supply will accept a trigger. The trigger is stored in volatile memory; the source is set to bus when the power supply has been off or after a remote interface reset.

Bus (Software) Triggering

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

TRIGger:SOURce BUS

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

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

*TRG

(trigger) command. When

*TRG

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Triggering Commands

• 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)

• To ensure synchronization when the bus source is selected, send the

(wait) command. When the

*WAI

supply 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

command is executed, the power

*WAI

• You can use the

(operation complete) command to signal when the operation is

*OPC

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

Immediate Triggering

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

TRIGger:SOURce IMM

• When the command immediately transfers the

[:AMPLitude] VOLTage[:LEVel][:IMMediate][:AMPLitude] [:LEVel][:IMMediate][:AMPLitude]

*OPC?

IMMediate

and

(operation complete query) command or the

command returns “1” to the output buffer when the

command sets the “OPC” bit (bit 0) in

*OPC

is selected as a trigger source, an

VOLTage:TRIGgered

CURRent:TRIGgered[:AMPLitude]

values. Any delay is ignored.

INITiate

and

CURRent

values to

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Triggering Commands

INITiate[:IMMediate]

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[:SEQuence]: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. MIN = 0 seconds. MAX = 3600 seconds. At

TRIGger[:SEQuence]:DELay?

This command queries the trigger delay.

TRIGger[:SEQuence]: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.

TRIGger[:SEQuence]: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 ( command has 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

TRIGger:SOURce BUS

SYSTem:REMote

). The

command first.

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System-Related Commands

DISPlay[:WINDow][:STATe] {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 ERROR annunciator.

The display state is automatically turned on when you return to the local mode. Press the key to return to the local state from the remote interface.

DISPlay[:WINDow][:STATe]?

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

DISPlay[:WINDow]:TEXT[:DATA] <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.

Local

DISPlay[:WINDow]:TEXT[:DATA]?

This command queries the message sent to the front panel and returns a quoted string.

DISPlay[:WINDow]:TEXT:CLEar

This command clears the message displayed on the front panel.

SYSTem:BEEPer[:IMMediate]

This command issues a single beep immediately.

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System-Related Commands

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” in chapter 5.

• 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 (clear status) command has been executed. The does not clear the error queue.

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, 1995.0).

*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 processor; 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,E3631A,0,X.X-X.X-X.X

(reset) command

*RST

*CLS

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System-Related Commands

*RST

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

Command

State

CURR[:LEV][:IMM] Output dependent value*

CURR[:LEV]:TRIG Output dependent value*

DISP[:STAT] ON

INST[:SEL] P6V

INST:COUP NONE

OUTP[:STAT] OFF

OUTP:TRAC OFF

TRIG:DEL 0

TRIG:SOUR BUS

VOLT[:LEV][:IMM] 0

VOLT[:LEV]:TRIG 0

The reset operation sets the current of +6V output to 5 A and the current of

+25V and -25V outputs to 1 A.

*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

INST[:SEL] VOLT[:IMM], CURR[:IMM], OUTP[:STAT], OUTP:TRAC, TRIG:SOUR TRIG:DEL

. To recall a stored state, you must use the same memory location

, and

used previously to store the state.

*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. You recall

states or values of the power supply from a memory location

*RST

that was not previously specified as a storage location.

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Calibration Commands

See chapter 3 “Calibration Overview”, starting on page 58 for an overview of the calibration features of the power supply. For more detailed discussion of the calibration procedures, see the Service Guide.

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 for three outputs will increase the value by six counts.

CALibration:CURRent[:DATA] <numeric value>

This command can only be used after calibration is unsecured. It enters a current value of a selected output that you obtained by reading an external meter. You must first select a calibration level ( value being entered. Two successive values (one for each end of the calibration range) 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

) for the

CALibration:CURRent:LEVel {MINimum | MAXimum}

Before using this command, you must select the output which is to be calibrated by using used after calibration is unsecured. It sets the power supply to a calibration point that is entered with During calibration, two points must be entered and the low-end point (MIN) must be selected and entered first.

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.

INSTrument

CALibration:CURRent[:DATA

command. This command can only be

] command.

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Calibration Commands

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. It enters a voltage value of a selected output that you obtained by reading an external meter. You must first select a calibration level (

CAL:VOLT:LEV

) for the value being entered. Two successive values (one for each end of the calibration range) must be selected and entered. The power supply then computes new voltage calibration constants. These constants are then stored in non-volatile memory.

CALibration:VOLTage:LEVel {MINimum | MAXimum}

Before using this command, you must select the output which is to be calibrated by using

INSTrument

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

CALibration:VOLTage[:DATA]

command. During calibration, two points must be entered and the low-end point (MIN) must be selected

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RS-232 Interface Commands

Use the front-panel “I/O configuration” key to select the baud rate, parity, and the number of data bits (See chapter 3 “Remote Interface Configuration”, starting on page 48).

SYSTem:LOCal

This command places the power supply in the local mode during RS-232 operation. All keys on the front panel are fully functional.

SYSTem:REMote

This command places the power supply in the remote mode for RS-232 operation. All keys on the front panel, except the “Local” key, are disabled.

It is very important that you send the place the power supply in the remote mode. Sending or receiving data over the RS-232 interface when not configured for remote operation can cause unpredictable results.

SYSTem:RWLock

This command places the power supply in the remote mode for RS-232 operation. This command is the same as the except that all keys on the front panel are disabled, including the “Local” key.

Ctrl-C

This command clears the operation in progress over the RS-232 interface and discard any pending output data. This is equivalent to the IEEE-488

device clear action over the GPIB interface.

SYSTem:REMote

command to

command

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The SCPI Status Registers

All SCPI instruments implement status registers in the same way. The status system records various instrument conditions in three register groups: the Status Byte register, the Standard Event register, and the Questionable Status register group. The status byte register records high-level summary information reported in the other register groups. The diagrams on the subsequent pages illustrate the SCPI status system used by the power supply.

An example program is included in chapter 6, “Application Programs,” which shows the use of the status registers. You may find it useful to refer to the program after reading the following section in this chapter.

What is an Event Register?

An event register is a read-only register that reports defined conditions within the power supply. Bits in an event register are latched. Once an event bit is set, subsequent state changes are ignored. Bits in an event register are automatically cleared by a query of that register (such as

STAT:QUES:EVEN?

reset ( an event register returns a decimal value which corresponds to the binary-weighted sum of all bits set in the register.

) or device clear will not clear bits in event registers. Querying

*RST

) or by sending the

(clear status) command. A

*CLS

*ESR?

What is an Enable Register?

An enable register defines which bits in the corresponding event register are logically ORed together to form a single summary bit. Enable registers are both readable and writable. Querying an enable register will not clear it. The (clear status) command does not clear enable registers but it does clear the bits in the event registers. To enable bits in an enable register, you must write a decimal value which corresponds to the binary-weighted sum of the bits you wish to enable in the register.

*CLS

What is a Multiple Logical Output?

The three-logical outputs of the power supply include an INSTrument summary status register and an individual instrument ISUMmary register for each logical output. The ISUMmary registers report to the INSTrument register, which in turn reports to bit 13 of the Questionable status register. This is shown pictorially on the next page.

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Using such a status register configuration allows a status event to be crossreferenced by output and type of event. The INSTrument register indicates which output(s) have generated an event. The ISUMmary register is a pseudoquestionable status register for a particular logical output.

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SCPI Status System

Binary Weights

20 = 1 21 = 2 22 = 4 23 = 8 24 = 16 25 = 32 26 = 64 27 = 128 28 = 256 29 = 512 210 = 1024 211 = 2048 212 = 4096 213 = 8192 214 = 16384 215 = 32768

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The Questionable Status Register

The Questionable Status register provides information about unexpected operation of the power supply. Bit 4 reports a fault with the fan, and bit 13 summarizes questionable outputs for any of the three supplies. For example if one of the three supplies is in constant voltage mode and due to an overload looses regulation, bit 13 is set (latched). Send the command

STAT:QUES?

enable registers you wish to summarize with bit 13. Send

:INST:ENAB 14 STAT:QUES:INST:ISUM<n>:ENAB 3

Questionable Instrument Summary register, where n is 1, 2, or 3.

Table 4-2. Bit Definitions - Questionable Status Register

0-3 Not used 0 Always set to 0.

4 FAN 16 The fan has a fault condition.

5-12 Not Used 0 Always set to 0.

13 ISUM 8192 Summary of QUES:INST and QUES:INST:ISUM registers.

14-15 Not Used 0 Always set to 0.

to read the register. To make use of bit 13 you must first

STAT:QUES

to enable the Questionable Instrument register. Then send

for each supply to enable the

Bit

Decimal

Value

Definition

The Questionable Instrument Status Register

The Questionable Instrument register provides information about unexpected operations for each of the three supplies. For example if the +6V supply is in the constant voltage mode and looses regulation, then bit 1 set indicating a possible overload in the +6V supply. The +25V supply is reported as bit 2, and the -25V supply as bit 3. Send the command

QUES:INST?

to read the register. The

STAT:QUES:INST:ISUM<n>

STAT

registers must be enabled to make use of the Questionable Instrument register. Send

STAT:QUES:INST:ISUM<n>:ENAB 3

to enable output n.

The Questionable Instrument Summary Register

There are three Questionable Instrument Summary registers, one for each supply output. These registers provide information about voltage and current regulation. Bit 0 is set when the voltage becomes unregulated, and bit 1 is set if the current becomes unregulated. For example if a supply which is operating as a voltage source (constant voltage mode) momentarily goes to constant current mode, bit 0 is set to indicate that the voltage output is not regulated. To read the register for each supply, send

:INST:ISUM<n>?

, where n is 1, 2, or 3.

STAT:QUES

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To determine the operating mode (CV or CC) for the power supply send

STAT:QUES:INST:ISUM<n>:COND?

the output. Bit 1 true indicates the output is in constant voltage mode, bit 0 true indicates constant current mode, both bits true indicates neither the voltage nor the current is regulated, and both bits false indicates the outputs of the power supply are off.

The Questionable Status Event register is cleared when:

• You execute the

(clear status) command.

*CLS

, where n is 1, 2, or 3 depending on

• You query the event register using

[:EVENt]?

For example, 16 is returned when you have queried the status of the questionable event register, the FAN condition is questionable.

The Questionable Status Enable register is cleared when:

• You execute

For example, you must send the

(Status Questionable Event register) command.

STATus:QUEStionable:ENABle 0

STATus:QUEStionable

STAT:QUES:ENAB 16

command.

to enable th e FAN bit.

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The Standard Event Register

The Standard Event register reports the following types of instrument events: power-on detected, command syntax errors, command execution errors, self-test or calibration errors, query errors, or when an command is executed. Any or all of these conditions can be reported in the Standard Event Summary bit (ESB, bit 5) of Status Byte register through the enable register. To set the enable register mask, you write a decimal value to the register using the

(Event Status Enable) command.

*ESE

An error condition (Standard Event register bits 2, 3, 4, or 5) will always record one or more errors in the power supply's error queue. Read the error queue using the

Table 4-3. Bit Definitions - Standard Event Register

Bit

0OPC 1

1 Not Used 0 Always set to 0.

2QYE 4

3 DDE 8

4EXE 16

5CME 32

6 Not Used 0 Always set to 0.

7 PON 128

Decimal Value

SYSTem:ERRor?

Definition

Operation Complete. All commands prior to and including an *OPC command have been executed.

Query Error. The power supply tried to read the output buffer but it was empty . Or, new command line was received before a previous query had been read. Or, both the input and output buffers are full.

Device Error. A self-test or calibration error occurred (see error numbers 601 through 748 in chapter 5).

Execution Error. An execution error occurred (see error numbers

-211 through -224 in chapter 5).

Command Error. A command syntax error occurred (see error number -101 through -178 in chapter 5).

Power On. Power has been turned off and on since the last time the event register was read or cleared

command.

*OPC

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The Standard Event register is cleared when:

• You execute the

• You query the event register using the

(clear status) command.

*CLS

*ESR?

(Event Status register)

command.

For example, 28 (4 + 8 + 16) is returned when you have queried the status of the Standard Event register, QYE, DDE, and EXE conditions have occurred.

The Standard Event Enable register is cleared when:

• You execute the

*ESE 0

command.

• You turn on the power and have previously configured the power supply

using the

*PSC 1

command.

• The enable register will not be cleared at power-on if you have previously

configured the power supply using the

For example, you must send the

*ESE 24

*PSC 0

command.

(8 + 16) to enable DDE and EXE

bits.

The Status Byte Register

The Status Byte summary register reports conditions from the other status registers. Query data that is waiting in the power supply's output buffer is immediately reported through the “Message Available” bit (bit 4) of Status Byte register. Bits in the summary register are not latched. Clearing an event register will clear the corresponding bits in the Status Byte summary register. Reading all messages in the output buffer, including any pending queries, will clear the message available bit.

Table 4-4. Bit Definitions - Status Byte Summary Register

Bit

0-2 Not Used 0 Always set to 0.

3 QUES 8

4 MAV 16 Data is available in the power supply output buffer.

5ESB 32

6 RQS 64 The power supply is requesting service (serial poll).

7 Not Used 0 Always set to 0.

Decimal Value

Definition

One or more bits are set in the questionable status register (bits must be “enabled” in the enable register).

One or more bits are set in the standard event register (bits must be “enabled” in the enable register).

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The Status Byte Summary register is cleared when:

• You execute the

• Querying the Standard Event register ( bit 5 in the Status Byte summary register.

For example, 24 (8 + 16) is returned when you have queried the status of the Status Byte register, QUES and MAV conditions have occurred.

The Status Byte Enable register (Request Service) is cleared when:

• You execute the

• You turn on the power and have previously configured the power supply using the

• The enable register will not be cleared at power-on if you have previously configured the power supply using

For example, you must send the bits.

*PSC 1

(clear status) command.

*CLS

*SRE 0

command.

*SRE 96

command) will clear only

*ESR?

*PSC 0

(32 + 64) to enable ESB and RQS

Using Service Request (SRQ) and Serial POLL

You must configure your bus controller to respond to the IEEE-488 service request (SRQ) interrupt to use this capability. Use the Status Byte enable register ( low-level IEEE-488 service request signal. When bit 6 (request service) is set in the Status Byte, an IEEE-488 service request interrupt message is automatically sent to the bus controller. The bus controller may then poll the instruments on the bus to identify which one requested service (the instrument with bit 6 set in its Status Byte).

command) to select which summary bits will set the

*SRE

The request service bit is cleared only by reading the Status Byte using an IEEE-488 serial poll or by reading the event register whose summary bit is causing the service request.

To read the Status Byte summary register, send the IEEE-488 serial poll message. Querying the summary register will return a decimal value which corresponds to the binary-weighted sum of the bits set in the register. Serial poll will automatically clear the “request service” bit in the Status Byte summary register. No other bits are affected. Performing a serial poll will not affect instrument throughput.

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Caution The IEEE-488 standard does not ensure synchronization between your

bus controller program and the instrument. Use the *OPC? command to guarantee that commands previously sent to the instrument have completed. Executing a serial poll before a *RST,*CLS, or other commands have completed can cause previous conditions to be reported.

Using *STB? to Read the Status Byte

The processed like any other instrument command. The returns the same result as a serial poll but the “request service” bit (bit 6) is not cleared.

The

*STB?

interface hardware and will be executed only after previous commands have completed. Polling is not possible using the

*STB?

(Status Byte query) command is similar to a serial poll but it is

*STB?

command is not handled automatically by the IEEE-488 bus

*STB?

command does not clear the Status Byte summary register.

command. Executing the

command

Using the Message Available Bit (MAV)

You can use the Status Byte “message available” bit (bit 4) to determine when data is available to read into your bus controller. The power supply subsequently clears bit 4 only after all messages have been read from the output buffer.

To Interrupt Your Bus Controller Using SRQ

1 Send a device clear message to clear the power supply's output buffer (e.g.,

CLEAR 705

2 Clear the event registers with the

3 Set up the enable register masks. Execute the

Standard Event register and the

4 Send the

to ensure synchronization.

5 Enable your bus controller's IEEE-488 SRQ interrupt.

*OPC?

(clear status) command.

*CLS

command to set up the

*ESE

command for the Status Byte.

*SRE

(operation complete query) command and enter the result

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To Determine When a Command Sequence is Completed

1 Send a device clear message to clear the power supply's output buffer (e.g.,

CLEAR 705

2 Clear the event registers with the

3 Enable the “operation complete” bit (bit 0) in the Standard Event register by

executing the

4 Send the

to ensure synchronization.

5 Execute your command string to program the desired configuration,

and then execute the command. When the command sequence is completed, the “operation complete” bit (bit 0) is set in the Standard Event register.

6 Use a serial poll to check to see when bit 5 (standard event) is set in the

Status Byte summary register. You could also configure the power supply for an SR Q i nt er rup t b y s en di ng

*ESE 1

*OPC?

command.

(operation complete query) command and enter the result

(operation complete) command as the last

*OPC

*SRE 32

(clear status) command.

*CLS

(St at us By te en abl e r eg is te r, bi t 5 ).

Using *OPC to Signal When Data is in the Output Buffer

Generally, it is best to use the “operation complete” bit (bit 0) in the Standard Event register to signal when a command sequence is completed. This bit is set in the register after an you send supply's output buffer (query data), you can use the “operation complete” bit to determine when the message is available. However, if too many messages are generated before the buffer will fill and the power supply will stop processing commands.

after a command which loads a message in the power

*OPC

command executes (sequentially), the output

*OPC

command has been executed. If

*OPC

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Status Reporting Commands

See diagram “SCPI Status System”, on page 90 in this chapter for detailed information of the status register structure of the power supply.

SYSTem:ERRor?

This query command reads one error from the error queue. 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 “Error Messages” in chapter 5

• The error queue is cleared when power has been off or after a (clear status) command has been executed. The does not clear the error queue.

STATus:QUEStionable[:EVENt]?

This command queries the Questionable Status event register. The power supply returns a decimal value which corresponds to the binary-weighted sum of all bits in the register.

STATus:QUEStionable:ENABle <enable value>

This command enables bits in the Questionable Status enable register. The selected bits are then reported to the Status Byte.

STATus:QUEStionable:ENABle?

This command queries the Questionable Status enable register. The power supply returns a binary-weighted decimal representing the bits set in the enable register.

(reset) command

*RST

*CLS

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STATus:QUEStionable:INSTrument[:EVENt]?

This command queries the Questionable Instrument event register. The power supply returns a decimal value which corresponds to the binary-weighted sum of all bits in the register and clears the register.

STATus:QUEStionable:INSTrument:ENABle <enable value>

This command sets the value of the Questionable Instrument enable register. This register is a mask for enabling specific bits from the Questionable Instrument event register to set the Instrument Summary bit (ISUM, bit 13) of the Questionable Status register. The “ISUM” bit of the Questionable Status register is the logical OR of all the Questionable Instrument event register bits that are enabled by the Questionable Instrument enable register.

STATus:QUEStionable:INSTrument:ENABle?

This query returns the value of the Questionable Instrument enable register.

STATus:QUEStionable:INSTrument:ISUMmary<n>[:EVENt]?

This query returns the value of the Questionable Instrument Isummary event register for a specific output of the three-output power supply. The particular output must be specified by a numeric value. n is 1, 2, or 3. See Table 4-1 on page 72 for the output number. The event register is a read-only register which holds (latches) all events. Reading the Questionable Instrument Isummary event register clears it.

STATus:QUEStionable:INSTrument:ISUMmary<n>:CONDition?

This query returns the CV or CC condition of the specified instrument. If “2” is returned, the queried instrument is in the CV operating mode. If “1” is returned, the queried instrument is in the CC operating mode. If “0” is returned, the outputs of the instrument are off or unregulated. If ‘3” is returned, the instrument is in the hardware failure. n is 1, 2, or 3.

STATus:QUEStionable:INSTrument:ISUMmary<n>:ENABle <enable value>

This command sets the value of the Questionable Instrument Isummary enable register for a specific output of the three-output power supply. The particular output must be specified by a numeric value. n is 1, 2, or 3. See Table 4-1 on page 72 for the output number. This register is a mask for enabling specific bits from the Questionable Instrument Isummary event register to set the Instrument Summary bit (bit 1, 2, and 3) of the Questionable Instrument register. These bits 1, 2, and bit 3 are the logical OR of all the Questionable Instrument Isummary event register bits that are enabled by the Questionable Instrument Isummary enable register.