Agilent Technologies 6632B, 66312A, 6613C, 6633B, 66332A User Manual

Programming Guide

Dynamic Measurement DC Source

Agilent Models 66312A, 66332A

System DC Power Supply

Agilent Models 6631B, 6632B, 6633B, 6634B

6611C, 6612C, 6613C, 6614C

Agilent Part No. 5962-8198 Printed in U.S.A.
Microfiche No 5962-8199 January, 2000

Safety Guidelines

The beginning of the Operating Guide has a Safety Summary page. Be sure you are familiar with the
information on this page before programming the dc source for operation from a controller.

Printing History

The edition and current revision of this manual are indicated below. Reprints of this guide containing minor
corrections and updates may have the same printing date. Revised editions are identified by a new
printing date. A revised edition incorporates all new or corrected material since the previous printing date.
Changes to the manual occurring between revisions are covered by change sheets shipped with the
guide.

This document contains proprietary information protected by copyright. All rights are reserved. No part of
this document may be photocopied, reproduced, or translated into another language without the prior
consent of Agilent Technologies. The information contained in this document is subject to change without
notice.

 Copyright 1997 Agilent Technologies Edition 1 November, 1997

Update 1 December, 1998
Update 2 January, 2000

2

Table of Contents

Safety Guidelines 2
Printing History 2
Table of Contents 3

1 - GENERAL INFORMATION 7

About this Guide 7
Documentation Summary 7
External References 8

GPIB References 8
SCPI References 8

2 - INTRODUCTION TO PROGRAMMING 9

VXIplug&play Power Products Instrument Drivers 9

Supported Applications 9
System Requirements 9
Downloading and Installing the Driver 9
Accessing Online Help 10

GPIB Capabilities of the DC Source 10

GPIB Address 10

RS-232 Capabilities of the DC Source 10

RS-232 Data Format 10
RS-232 Flow Control 11
RS-232 Programming Example 11
RS-232 Troubleshooting 12

Introduction to SCPI 12

Conventions Used in This Guide 12

Types of SCPI Commands 13

Multiple Commands in a Message 13
Moving Among Subsystems 14
Including Common Commands 14
Using Queries 14

Types of SCPI Messages 14

The Message Unit 15
Headers 15
Query Indicator 15
Message Unit Separator 15
Root Specifier 15
Message Terminator 15

SCPI Data Formats 16

Numerical Data Formats 16
Suffixes and Multipliers 16
Response Data Types 16

SCPI Command Completion 17
Using Device Clear 17

3 - PROGRAMMING THE DC SOURCE 19

Introduction 19
Programming the Output 19

Power-on Initialization 19
Enabling the Output 19
Output Voltage 20
Output Current 20

Triggering Output Changes 21

SCPI Triggering Nomenclature 21

3

Output Trigger System Model 21
Setting the Voltage or Current Trigger Levels 21
Initiating the Output Trigger System 22
Generating Triggers 22

Making Measurements 23

Voltage and Current Measurements 23

Internally Triggered Measurements 25

SCPI Triggering Nomenclature 25
Measurement Trigger System Model 25
Initiating the Measurement Trigger System (Agilent 66312A, 66332A Only) 25
Selecting the Measurement Trigger Source (Agilent 66312A, 66332A Only) 26
Generating Measurement Triggers (Agilent 66312A, 66332A Only) 26

Measuring Output Pulses (Agilent 66312A, 66332A Only) 28

Current Detector 28
Pulse Measurement Queries 28

Controlling Measurement Samples 29

Varying the Voltage or Current Sampling Rate 29
Multiple Measurements (Agilent 66312A, 66332A Only) 29
Pre-event and Post-event Triggering (Agilent 66312A, 66332A Only) 30
Pulse Measurement Example (Agilent 66312A, 66332A only) 30

Programming the Status Registers 32

Power-On Conditions 32
Operation Status Group 33
Questionable Status Group 34
Standard Event Status Group 34
Status Byte Register 34
Determining the Cause of a Service Interrupt 35
Servicing Operation Status and Questionable Status Events 35
Monitoring Both Phases of a Status Transition 36

Inhibit/Fault Indicator 36

Remote Inhibit (RI) 36
Discrete Fault Indicator (DFI) 36
Using the Inhibit/Fault Port as a Digital I/O 37
DFI Programming Example 37

4 - LANGUAGE DICTIONARY 39

Introduction 39

Subsystem Commands 39
Common Commands 43
Programming Parameters 43

Calibration Commands 44

CALibrate:CURRent 44
CALibrate:CURRent:NEGative 44
CALibrate:CURRent:MEASure:LOWRange 44
CALibrate:CURRent:MEASure:AC 44
CALibrate:DATA 45
CALibrate:LEVel 45
CALibrate:PASSword 45
CALibrate:SAVE 45
CALibrate:STATe 46
CALibrate:VOLTage 46
CALibrate:VOLTage:PROTection 46

Measurement Commands 47

MEASure:ARRay:CURRent? FETCh:ARRay:CURRent? 47
MEASure:ARRay:VOLTage? FETCh:ARRay:VOLTage? 47

4

MEASure:CURRent? FETCh:CURRent? 48
MEASure:CURRent:ACDC? FETCh:CURRent:ACDC? 48
MEASure:CURRent:HIGH? FETCh:CURRent:HIGH? 48
MEASure:CURRent:LOW? FETCh:CURRent:LOW? 49
MEASure:CURRent:MAXimum? FETCh:CURRent: MAXimum? 49
MEASure:CURRent:MINimum? FETCh:CURRent:MINimum? 49
MEASure:VOLTage? FETCh:VOLTage? 50
MEASure:VOLTage:ACDC? FETCh:VOLTage:ACDC? 50
MEASure:VOLTage:HIGH? FETCh:VOLTage:HIGH? 50
MEASure:VOLTage:LOW? FETCh:VOLTage:LOW? 51
MEASure:VOLTage:MAXimum? FETCh:VOLTage:MAXimum? 51
MEASure:VOLTage:MINimum? FETCh:VOLTage:MINimum? 51
SENSe:CURRent:RANGe 52
SENSe:CURRent:DETector 52
SENSe:FUNCtion 53
SENSe:SWEep:OFFSet:POINts 53
SENSe:SWEep:POINts 53
SENSe:SWEep:TINTerval 53
SENSe:WINDow 54

Output Commands 55

OUTPut 55
OUTPut:DFI 55
OUTPut:DFI:SOURce 55
OUTPut:PON:STATe 56
OUTPut:PROTection:CLEar 56
OUTPut:PROTection:DELay 56
OUTPut:RELay 57
OUTPut:RELay:POLarity 57
OUTPut:RI:MODE 57
[SOURce:]CURRent 58
[SOURce:]CURRent:TRIGger 58
[SOURce:]CURRent:PROTection:STATe 58
[SOURce:]DIGital:DATA 59
[SOURce:]DIGital:FUNCtion 59
[SOURce:]VOLTage:ALC:BANDwidth? [SOURce:]VOLTage:ALC:BWIDth? 60
[SOURce:]VOLTage:TRIGger 60
[SOURce:]VOLTage:PROTection 60

Status Commands 61

STATus:PRESet 61
STATus:OPERation? 61
STATus:OPERation:CONDition? 61
STATus:OPERation:ENABle 62
STATus:OPERation:NTR STATus:OPERation:PTR 62
STATus:QUEStionable? 63
STATus:QUEStionable:CONDition? 63
STATus:QUEStionable:ENABle 63
STATus:QUEStionable:NTR STATus:QUEStionable:PTR 64
*CLS 64
*ESE 65
*ESR? 65
*OPC 65
*PSC 66
*SRE 66
*STB? 67
*WAI 67

5

System Commands 68

DISPlay 68
DISPlay:MODE 68
DISPlay:TEXT 68
SYSTem:ERRor? 69
SYSTem:LANGuage 69
SYSTem:VERSion? 69
SYSTem:LOCal 70
SYSTem:REMote 70
SYSTem:RWLock 70
*IDN? 70
*OPT? 71
*RCL 71
*RST 71
*SAV 72
*TST? 72

Trigger Commands 73

ABORt 73
INITiate:SEQuence INITiate:NAME 73
INITiate:CONTinuous:SEQuence1 INITiate:CONTinuous:NAME 73
TRIGger 74
TRIGger:SOURce 74
TRIGger:SEQuence2 TRIGger:ACQuire 74
TRIGger:SEQuence2:COUNt:CURRent TRIGger:ACQuire:COUNt:CURRent 75
TRIGger:SEQuence2:COUNt:VOLTage TRIGger:ACQuire:COUNt:VOLTage 75
TRIGger:SEQuence2:HYSTeresis:CURRent TRIGger:ACQuire:HYSTeresis:CURRent 76
TRIGger:SEQuence2:HYSTeresis:VOLTage TRIGger:ACQuire:HYSTeresis:VOLTage 76
TRIGger:SEQuence2:LEVel:CURRent TRIGger:ACQuire:LEVel:CURRent 77
TRIGger:SEQuence2:LEVel:VOLTage TRIGger:ACQuire:LEVel:VOLTage 77
TRIGger:SEQuence2:SLOPe:CURRent TRIGger:ACQuire:SLOPe:CURRent 78
TRIGger:SEQuence2:SLOPe:VOLTage TRIGger:ACQuire:SLOPe:VOLTage 78
TRIGger:SEQuence2:SOURce TRIGger:ACQuire:SOURce 79
TRIGger:SEQuence1:DEFine TRIGger:SEQuence2:DEFine 79
*TRG 79

A - SCPI CONFORMANCE INFORMATION 81

SCPI Version 81

SCPI Confirmed Commands 81
Non-SCPI Commands 81

B - COMPATIBILITY LANGUAGE 83

Introduction 83

C - ERROR MESSAGES 89

Error Number List 89

D - EXAMPLE PROGRAMS 93

Introduction 93

Assigning the GPIB Address in Programs 93
Types of DOS Drivers 93
Error Handling 94
BASIC Controllers 94
Example 1. HP Vectra PC Controller Using Agilent 82335 Interface 94
Example 2. IBM Controller Using National Interface 96
Example 3. Controller Using BASIC 98

INDEX 99

6

General Information

About this Guide

This guide provides remote programming information for the following series of GPIB programmable dc
power supplies:

•

Agilent 66312A

•

Agilent 66332A

•

Agilent 6631B/6632B/6633B/6634B

•

Agilent 6611C/6612C/6613C/6614C
You will find the following information in the rest of this guide:
Chapter 1 Introduction to this guide.

Chapter 2 Introduction to SCPI messages structure, syntax, and data formats. Examples of SCPI

programs
Chapter 3 Introducton to Programming the dc source with SCPI commands.
Chapter 4 Dictionary of SCPI commands.
Appendix A SCPI conformance information.

1

Appendix B Use of the alternate Comptibility programming language.
Appendix C Error messages

Documentation Summary

The following documents that are related to this Programming Guide have additional helpful information
for using the dc source.

♦

User’s Guide for Agilent 66312A and Agilent 6611C/6612C/6613C/3314C. Includes specifications
and supplemental characteristics, how to use the front panel, how to connect to the instrument,
and calibration procedures.

♦

User’s Guide for Agilent 66332A and Agilent 6631B/6632B/6633B/6634B. Includes specifications
and supplemental characteristics, how to use the front panel, how to connect to the instrument,
and calibration procedures.

7

1 - General Information

External References

GPIB References

The most important GPIB documents are your controller programming manuals - BASIC, GPIB Command
Library for MS DOS, etc. Refer to these for all non-SCPI commands (for example: Local Lockout).

The following are two formal documents concerning the GPIB interface:

♦

ANSI/IEEE Std. 488.1-1987 IEEE Standard Digital Interface for Programmable Instrumentation

Defines the technical details of the GPIB interface. While much of the information is beyond the
need of most programmers, it can serve to clarify terms used in this guide and in related
documents.

♦

ANSI/IEEE Std. 488.2-1987 IEEE Standard Codes, Formats, Protocols, and Common
Commands

programming. Helpful for finding precise definitions of certain types of SCPI message formats,
data types, or common commands.

The above two documents are available from the IEEE (Institute of Electrical and Electronics Engineers),
345 East 47th Street, New York, NY 10017, USA. The WEB address is www.ieee.org.

. Recommended as a reference only if you intend to do fairly sophisticated

.

SCPI References

The following documents will assist you with programming in SCPI:

♦

Standard Commands for Programmable Instruments Volume 1, Syntax and Style

♦

Standard Commands for Programmable Instruments Volume 2, Command References

♦

Standard Commands for Programmable Instruments Volume 3, Data Interchange Format

♦

Standard Commands for Programmable Instruments Volume 4, Instrument Classes

To obtain a copy of the above documents, contact: Fred Bode, Executive Director, SCPI Consortium,
8380 Hercules Drive, Suite P3, Ls Mesa, CA 91942, USA

8

Introduction to Programming

VXI

plug&play

VXI

plug&play

Web at http://www.agilent.com/find/drivers. These instrument drivers provide a high-level programming
interface to your Agilent Technologies instrument. VXI
programming your instrument with SCPI command strings. Because the instrument driver’s function
calls work together on top of the VISA I/O library, a single instrument driver can be used with multiple
application environments.

Supported Applications

ñ Agilent VEE
ñ Microsoft Visual BASIC
ñ Microsoft Visual C/C++
ñ Borland C/C++
ñ National Instruments LabVIEW
ñ National Instruments LabWindows/CVI

instrument drivers for Microsoft Windows 95 and Windows NT are now available on the

Power Products Instrument Drivers

plug&play

instrument drivers are an alternative to

2

System Requirements

The VXI

ñ Microsoft Windows 95
ñ Microsoft Windows NT 4.0
ñ HP VISA revision F.01.02

ñ National Instruments VISA 1.1

plug&play

Power Products instrument driver complies with the following:

Downloading and Installing the Driver

NOTE: Before installing the VXIplug&play instrument driver, make sure that you have one of the

supported applications installed and running on your computer.

1.Access Agilent Technologies’ Web site at http://www.agilent.com/find/drivers.

2. Select the instrument for which you need the driver.

3. Click on the driver, either Windows 95 or Windows NT, and download the executable file to your
pc.

4.Locate the file that you downloaded from the Web. From the Start menu select Run
<path>:\agxxxx.exe - where <path> is the directory path where the file is located, and agxxxx is
the instrument driver that you downloaded .

5.Follow the directions on the screen to install the software. The default installation selections will
work in most cases. The readme.txt file contains product updates or corrections that are not
documented in the on-line help. If you decide to install this file, use any text editor to open and
read it.

9

2 - Introduction to Programming

6.To use the VXI

under “Introduction to Programming”.

plug&play

instrument driver, follow the directions in the VXI

plug&play

online help

Accessing Online Help

A comprehensive online programming reference is provided with the driver. It describes how to get
started using the instrument driver with Agilent VEE, LabVIEW, and LabWindows. It includes complete
descriptions of all function calls as well as example programs in C/C++ and Visual BASIC.

ñ To access the online help when you have chosen the default Vxipnp start folder, click on the Start

button and select Programs | Vxipnp | Agxxxx Help (32-bit).

- where agxxxx is the instrument driver.

GPIB Capabilities of the DC Source

All dc source functions except for setting the GPIB address are programmable over the GPIB. The IEEE

488.2 capabilities of the dc source are listed in the Specifications Table of the User's Guide.

GPIB Address

The dc source operates from an GPIB address that is set from the front panel. To set the GPIB address,
press the Address key on the front panel and enter the address using the Entry keys. The GPIB address
is stored in non-volatile memory.

RS-232 Capabilities of the DC Source

The dc source provides an RS-232 programming interface, which is activated by commands located under
the front panel Address key. All SCPI and COMPatibility commands are available through RS-232
programming. When the RS-232 interface is selected, the GPIB interface is disabled.

The EIA RS-232 Standard defines the interconnections between Data Terminal Equipment (DTE) and
Data Communications Equipment (DCE). The dc source is designed to be a DTE. It can be connected to
another DTE such as a PC COM port through a null modem cable.

NOTE: The RS-232 settings in your program must match the settings specified in the front panel

Address menu. Press the front panel Address key if you need to change the settings.

RS-232 Data Format

The RS-232 data is a 10-bit word with one start bit and one stop bit. The number of start and stop bits is
not programmable. However, the following parity options are selectable using the front panel Address key:

EVEN Seven data bits with even parity
ODD Seven data bits with odd parity
MARK Seven data bits with mark parity (parity is always true)
SPACE Seven data bits with space parity (parity is always false)
NONE Eight data bits without parity

Parity options are stored in non-volatile memory.

10

Introduction to Programming - 2

Baud Rate

The front panel Address key lets you select one of the following baud rates, which is stored in non-volatile
memory:
300 600 1200 2400 4800 9600

RS-232 Flow Control

The RS-232 interface supports several flow control options that are selected using the front panel Address
key. For each case, the dc source will send a maximum of five characters after holdoff is asserted by the
controller. The dc source is capable of receiving as many as fifteen additional characters after it asserts
holdoff.

XON-XOFF A software handshake that uses the ASCII control code DC3 (decimal code

19) to assert hold-off, and control code DC1 (decimal code 17) to release
hold-off.

RTS-CTS The dc source asserts its Request to Send (RTS) line to signal hold-off

when its input buffer is almost full, and it interprets its Clear to Send (CTS)
line as a hold-off signal from the controller.

DTR-DSR The dc source asserts its Data Terminal Ready (DTR) line to signal hold-off

when its input buffer is almost full, and it interprets its Data Set Ready
(DSR) line as a hold-off signal from the controller.

NONE There is no flow control.
Flow control options are stored in non-volatile memory.

RS-232 Programming Example

The following program illustrates how to program the power supply using RS-232 to set the output voltage
and current and to readback the model number and output voltage. The program was written to run on any
controller using Microsoft QBasic.

NOTE: The power supply must be configured for RS232 and the same baud rate and parity as

the controller.

‘ Program to write and read via RS232.
‘ Configure the power supply for 9600 baud, even parity and RS232
‘ Configure serial port for:”
‘ 9600 baud
‘ 7 bit data
‘ 2 stop bits
‘ Ignore request to send
‘ Ignore carrier detect
‘ Even parity ‘ Needed with Vectra basic, ignored with QBasic
‘ Send line feed
‘ Reserve 1000 character buffer for serial I/O
‘
DECLARE FUNCTION gets$ ()
CLS ‘ Clears screen
LOCATE 1, 1 ‘ Position curser at top left
‘ Configure Com Port
OPEN “com1:9600,e,7,2,rs,cd,pe,lf” FOR RANDOM AS #1 LEN = 1000
PRINT #1, “OUTPUT ON” ‘ Turn on output then set voltage and current
PRINT #1, “VOLT 6” ‘ Set voltage to 6 volts
PRINT #1, “CURR .5” ‘ Set current to 0.5 amps
PRINT #1, “*IDN?” ‘ Query the power supply identification string
PRINT gets$ ‘ Go to gets$ Function and print data returned
PRINT #1, MEAS”VOLT?”; volt ‘ Query the power supply voltage
Volt = VAL (gets$) ‘ Convert gets$ string to a value
PRINT gets$ ‘ Print the value of the voltage
END ‘ End of main program

11

2 - Introduction to Programming

FUNCTION gets$ ‘ Get a new line feed terminated string from device #1
C$ = “” ‘ Set C$ to null
WHILE c$ <> CHR$ (10) ‘ Set loop to stop at Line Feed
C$ = INPUT$ (1, #1) ‘ Read 1 bit into file #1
Resp$ = resp$ + c$ ‘ Concantenate bit with previous bits
WEND ‘ End of WHILE loop
gets$ = resp$ ‘ Assign response to gets$
END FUNCTION

RS-232 Troubleshooting

If you are having trouble communicating over the RS-232 interface, check the following:

♦

The computer and the dc source must be configured for the same baud rate, parity, number of
data bits, and flow control options. Note that the dc source is configured for 1 start bit and 1 stop
bit (these values are fixed).

♦

The correct interface cables or adaptors must be used, as described under RS-232 Connector.
Note that even if the cable has the proper connectors for your system, the internal wiring may be
incorrect.

♦

The interface cable must be connected to the correct serial port on your computer (COM1, COM2,
etc.).

Introduction to SCPI

SCPI (Standard Commands for Programmable Instruments) is a programming language for controlling
instrument functions over the GPIB. SCPI is layered on top of the hardware-portion of IEEE 488.2. The
same SCPI commands and parameters control the same functions in different classes of instruments. For
example, you would use the same DISPlay command to control the dc source display and the display of a
SCPI-compatible multimeter.

Conventions Used in This Guide

Angle brackets < > Items within angle brackets are parameter abbreviations. For example,

<NR1> indicates a specific form of numerical data.

Vertical bar | Vertical bars separate alternative parameters. For example, NORM | TEXT

indicates that either "TEXT" or "NORM" can be used as a parameter.

Square Brackets [ ] Items within square brackets are optional. The representation [SOURce:].

VOLTage means that SOURce: may be omitted.

Braces { } Braces indicate parameters that may be repeated zero or more times. It is

used especially for showing arrays. The notation <A>{<,B>} shows that
parameter "A" must be entered, while parameter "B" may be omitted or
may be entered one or more times.

Boldface font

Computer font Computer font is used to show program lines in text.

Boldface font is used to emphasize syntax in command definitions.
TRIGger:COUNt:CURRent <NRf> shows command definition.

TRIGger:COUNt:CURRent 10 shows a program line.

12

Types of SCPI Commands

SCPI has two types of commands, common and subsystem.

♦

Common commands generally are not related to specfic operation but to controlling overall dc
source functions, such as reset, status, and synchronization. All common commands consist of a
three-letter nmemonic preceded by an asterisk: *RST *IDN? *SRE 8

♦

Subsystem commands perform specific dc source functions. They are organized into an inverted
tree structure with the "root" at the top. The following figure shows a portion of a subsystem
command tree, from which you access the commands located along the various paths. You can
see the complete tree in Table 4-1.

ROOT

Introduction to Programming - 2

:OUTPut

:STATus

[:STATe]
:DFI

:PON

:PROTection

:OPERation

[:STATe]
:SOURce

:STATe

:CLEar
:DELay

?

[:EVEN]

:CONDition?

Figure 2-1. Partial Command Tree

Multiple Commands in a Message

Multiple SCPI commands can be combined and sent as a single message with one message terminator.
There are two important considerations when sending several commands within a single message:

♦

Use a semicolon to separate commands within a message.

♦

There is an implied header path that affects how commands are interpreted by the dc source.

The header path can be thought of as a string that gets inserted before each command within a message.
For the first command in a message, the header path is a null string. For each subsequent command the
header path is defined as the characters that make up the headers of the previous command in the
message up to and including the last colon seperator. An example of a message with two commands is:

CURR:LEV 3;PROT:STAT OFF

which shows the use of the semicolon separating the two commands, and also illustrates the header path
concept. Note that with the second command, the leading header "CURR" was omitted because after the
"CURR:LEV 3" command, the header path was became defined as "CURR" and thus the instrument
interpreted the second command as:

CURR:PROT:STAT OFF

In fact, it would have been syntactically incorrect to include the "CURR" explicitly in the second command,
since the result after combining it with the header path would be:

CURR:CURR:PROT:STAT OFF

which is incorrect.

13

2 - Introduction to Programming

Moving Among Subsystems

In order to combine commands from different subsystems, you need to be able to reset the header path to
a null string within a message. You do this by beginning the command with a colon (:), which discards any
previous header path. For example, you could clear the output protection and check the status of the
Operation Condition register in one message by using a root specifier as follows:

OUTPut:PROTection:CLEAr;:STATus:OPERation:CONDition?

The following message shows how to combine commands from different subsystems as well as within the
same subsystem:

VOLTage:LEVel 20;PROTection 28; :CURRent:LEVel 3;PROTection:STATe ON

Note the use of the optional header LEVel to maintain the correct path within the voltage and current
subsystems, and the use of the root specifier to move between subsytems.

Including Common Commands

You can combine common commands with system commands in the same message. Treat the common
command as a message unit by separating it with a semicolon (the message unit separator). Common
commands

VOLTage:TRIGgered 17.5;:INITialize;*TRG
OUTPut OFF;*RCL 2;OUTPut ON

do not affect the header path

; you may insert them anywhere in the message.

Using Queries

Observe the following precautions with queries:

♦

Set up the proper number of variables for the returned data.

♦

Read back all the results of a query before sending another command to the dc source. Otherwise
a

Query Interrupted

error will occur and the unreturned data will be lost.

Types of SCPI Messages

There are two types of SCPI messages, program and response.

♦

program message

A
controller to the dc source. The message, which may be sent at any time, requests the dc source
to perform some action.

♦

response message

A
controller. The dc source sends the message only when commanded by a program message
called a "query."

The following figure illustrates SCPI message structure:

consists of one or more properly formatted SCPI commands sent from the

consists of data in a specific SCPI format sent from the dc source to the

14

Ke

y

y

g

g

Query Indicator

Root Specifier

Data

words

Messa

Introduction to Programming - 2

e Unit

VOLT

word Separator

Ke

:LEV 20

Messa

e Unit Separators

PROT 21;; : CURR?

Message Terminator

<NL>

Figure 2-2. Command Message Structure

The Message Unit

The simplest SCPI command is a single message unit consisting of a command header (or keyword)
followed by a message terminator. The message unit may include a parameter after the header. The
parameter can be numeric or a string.

ABORt<NL>
VOLTage 20<NL>

Headers

Headers, also referred to as keywords, are instructions recognized by the dc source. Headers may be
either in the long form or the short form. In the long form, the header is completely spelled out, such as
VOLTAGE, STATUS, and DELAY. In the short form, the header has only the first three or four letters,
such as VOLT, STAT, and DEL.

Query Indicator

Following a header with a question mark turns it into a query (VOLTage?, VOLTage:PROTection?). If a
query contains a parameter, place the query indicator at the end of the last header
(VOLTage:PROTection? MAX).

Message Unit Separator

When two or more message units are combined into a compound message, separate the units with a
semicolon (STATus:OPERation?;QUEStionable?).

Root Specifier

When it precedes the first header of a message unit, the colon becomes the root specifier. It tells the
command parser that this is the root or the top node of the command tree.

Message Terminator

A terminator informs SCPI that it has reached the end of a message. Three permitted messages
terminators are:

♦ newline (<NL>), which is ASCII decimal 10 or hex 0A.
♦ end or identify (<END>)
♦ both of the above (<NL><END>).

In the examples of this guide, there is an assumed message terminator at the end of each message.

15

2 - Introduction to Programming

NOTE:

All RS-232 response data sent by the dc source is terminated by the ASCII character pair
<carriage return><newline>. This differs from GPIB response data which is terminated by
the single character <newline> with EOI asserted.

SCPI Data Formats

All data programmed to or returned from the dc source is ASCII. The data may be numerical or character
string.

Numerical Data Formats

Symbol Data Form

Talking Formats
<NR1> Digits with an implied decimal point assumed at the right of the least-significant digit.

Examples: 273
<NR2>
<NR3>
Listening Formats
<Nrf>

Digits with an explicit decimal point. Example: .0273

Digits with an explicit decimal point and an exponent. Example: 2.73E+2

Extended format that includes <NR1>, <NR2> and <NR3>. Examples: 273 273. 2.73E2
<Nrf+>

<Bool>

Expanded decimal format that includes <NRf> and MIN MAX. Examples: 273 273.

2.73E2 MAX. MIN and MAX are the minimum and maximum limit values that are

implicit in the range specification for the parameter.

Boolean Data. Example: 0 | 1 or ON | OFF

Suffixes and Multipliers

Class Suffix Unit Unit with Multiplier

Current A ampere MA (milliampere)

Amplitude V volt MV (millivolt)

Time S second MS (millisecond)

Common Multipliers

1E3 K kilo
1E-3 M milli
1E-6 U micro

Response Data Types

Character strings returned by query statements may take either of the the following forms, depending on
the length of the returned string:

<CRD> Character Response Data. Permits the return of character strings.
<AARD> Arbitrary ASCII Response Data. Permits the return of undelimited 7-bit ASCII. This data type

has an implied message terminator.

<SRD> String Response Data. Returns string parameters enclosed in double quotes.

16

Introduction to Programming - 2

SCPI Command Completion

SCPI commands sent to the dc source are processed either sequentially or in parallel. Sequential
commands finish execution before a subsequent command begins. Parallel commands allow other
commands to begin executing while the parallel command is still executing. Commands that affect trigger
actions are among the parallel commands.

The *WAI, *OPC, and *OPC? common commands provide different ways of indicating when all
transmitted commands, including any parallel ones, have completed their operations. The syntax and
parameters for these commands are described in chapter 4. Some practical considerations for using
these commands are as follows:

*WAI

*OPC?

*OPC

This prevents the dc source from processing subsequent commands until all pending
operations are completed.

This places a 1 in the Output Queue when all pending operations have completed.
Because it requires your program to read the returned value before executing the next
program statement, *OPC? can be used to cause the controller to wait for commands
to complete before proceeding with its program.

This sets the OPC status bit when all pending operations have completed. Since your
program can read this status bit on an interrupt basis, *OPC allows subsequent
commands to be executed.

NOTE: The trigger subsystem must be in the Idle state in order for the status OPC bit to be true.

Therefore, as far as triggers are concerned, OPC is false whenever the trigger subsystem
is in the Initiated state.

Using Device Clear

You can send a device clear at any time abort a SCPI command that may be hanging up the GPIB
interface. The status registers, the error queue, and all configuration states are left unchanged when a
device clear message is received. Device clear performs the following actions:

♦

The input and output buffers of the dc source are cleared.

♦

The dc source is prepared to accept a new command string.

The following statement shows how to send a device clear over the GPIB interface using

CLEAR 705

The following statement shows how to send a device clear over the GPIB interface using the GPIB
command library for

IOCLEAR (705)

C

IEEE-488 Device Clear

or

QuickBASIC

:

Agilent BASIC:

NOTE: For RS-232 operation, sending a Break will perform the same operation as the IEE-488

device clear message.

17

Programming the DC Source

Introduction

This chapter contains examples on how to program your dc source. Simple examples show you how to
program:

u output functions such as voltage and current
u internal and external triggers
u measurement functions
u the status and protection functions

NOTE: These examples in this chapter show which commands are used to perform a particular

function, but do not show the commands being used in any particular programming
environment. Refer to Appendix D for some examples of SCPI commands in a specific
programming environment.

3

Programming the Output

Power-on Initialization

When the dc source is first turned on, it wakes up with the output state set OFF. In this state the output
voltage is set to 0. The following commands are given implicitly at power-on:

*RST
*CLS
STATus:PRESet
*SRE 0
*ESE 0

*RST is a convenient way to program all parameters to a known state. Refer to the *RST command in
chapter 4 to see how each programmable parameter is set by *RST. Refer to the *PSC command in
chapter 4 for more information on the power-on initialization of the *ESE and the *SRE registers.

Enabling the Output

To enable the output, use the command:

OUTPut ON

19

3 - Programming the DC Source

Output Voltage

The output voltage is controlled with the VOLTage command. For example, to set the output voltage to 25
volts, use:

VOLTage 125

The dc source can be programmed to turn off its output if the output voltage exceeds a preset peak
voltage limit. This protection feature is implemented with the VOLTage:PROTection command as
explained in chapter 4.

Maximum Voltage

The maximum rms output voltage that can be programmed can be queried with:

VOLTage? MAX

Output Current

All models have a programmable current function. The command to program the current is:

CURRent <n>

where <n> is the current limit in amperes.
If the load attempts to draw more current than the programmed limit, the output voltage is reduced to keep

the current within the limit.

Maximum Current

The maximum output current that can be programmed can be queried with:

CURRent? MAX

Overcurrent Protection

The dc source can also be programmed to turn off its output if the current limit is reached. As explained in
chapter 4, this protection feature is implemented the following command:

CURRent:PROTection:STATe ON | OFF

NOTE: Use OUTP:PROT:DEL to prevent momentary current limit conditions caused by

programmed output changes from tripping the overcurrent protection.

20

Programming the DC Source - 3

INITIATED STATE

IDLE STATE

TRIGGER RECEIVED

INITiate[:IMMediate]

Triggering Output Changes

The dc source has two independent trigger systems. One is used for generating output changes, and the
other is used for triggering measurements. This section describes the output trigger system. The
measurement trigger system is described under "Triggering Measurements".

SCPI Triggering Nomenclature

In SCPI terms, trigger systems are called sequences. When more than one trigger system exists, they are
differentiated by naming them SEQuence1 and SEQuence2. SEQuence1 is the transient trigger system
and SEQuence2 is the measurement trigger system. The dc source uses aliases with more descriptive
names for these sequences. These aliases can be used instead of the sequence forms.

Sequence Form Alias

SEQuence1 TRANsient
SEQuence2 ACQuire

Output Trigger System Model

Figure 3-1 is a model of the output trigger system. The rectangular boxes represent states. The arrows
show the transitions between states. These are labeled with the input or event that causes the transition
to occur.

ABORt

INITiate:CONTinuous OFF

INITiate:CONTinuous ON

OUTPUT

LEVEL

CHANGE

*RST
*RCL

Figure 3-1. Model of Output Triggers

Setting the Voltage or Current Trigger Levels

To program output trigger levels, you must first specify a voltage or current trigger level that the output will
go to once a trigger signal is received. Use the following commands to set the output trigger level:

VOLTage:TRIGgered <n> or
CURRent:TRIGgered <n>

NOTE: Until they are programmed, uninitialized trigger levels will assume their corresponding

immediate levels. For example, if a dc source is powered up and VOLTage:LEVel is
programmed to 6, then VOLTage:LEVel:TRIGger will also be 6 until you program it to
another value. Once you program VOLTage:LEVel:TRIGger to a value, it will remain at
that value regardless of how you subsequently reprogram VOLTage:LEVel.

21

3 - Programming the DC Source

Initiating the Output Trigger System

When the dc source is turned on, the trigger subsystem is in the idle state. In this state, the trigger
subsystem ignores all triggers. Sending the following commands at any time returns the trigger system to
the Idle state:

ABORt
*RST
*RCL

The INITiate commands move the trigger system from the Idle state to the Initiated state. This enables
the dc source to receive triggers. To initiate for a single triggered action, use:

INITiate:SEQuence1or
INITiate:NAME TRANsient

After a trigger is received and the action completes, the trigger system will return to the Idle state. Thus it
will be necessary to initiate the system each time a triggered action is desired.

To keep a trigger system initiated for multiple actions without having to send an initiate command for each
trigger, use:

INITiate:CONTinuous:SEQuence1 ON or
INITiate:CONTinuous:NAME TRANsient, ON

Generating Triggers

You can only program output triggers over the GPIB bus. Since BUS is the only trigger source for output
triggers, the following command is provided for completeness only:

TRIGger:SOURce BUS

After you have specified the appropriate trigger source, you can generate triggers as follows:
Single Triggers Send one of the following commands over the GPIB:

TRIGger:IMMediate
*TRG

a group execute trigger

Continuous Triggers Send the following command over the GPIB:

INITiate:CONTinuous:SEQuence1 ON

When the trigger system enters the Output Change state upon receipt of a trigger (see figure 3-1), the
triggered functions are set to their programmed trigger levels. When the triggered actions are completed,
the trigger system returns to the Idle state.

22

Programming the DC Source - 3

Making Measurements

The dc source has the ability to make several types of voltage or current measurements. The
measurement capabilities of the Agilent 66312A and Agilent 66332A models are particulary useful for
loads that draw current in pulses.

NOTE: You cannot measure output voltage and current simultaneously.
All measurements are performed by digitizing the instantaneous output voltage or current for a defined

number of samples and sample interval, storing the results in a buffer, and then calculating the measured
result. Many parameters of the measurement are programmable. These include the number of samples,
the time interval between samples, the bandwidth, and the method of triggering. Note that there is a
tradeoff between these parameters and the speed, accuracy, and stability of the measurement in the
presence of noise.

There are two ways to make measurements:

♦

Use the MEASure commands to immediately start acquiring new voltage or current data, and
return measurement calculations from this data as soon as the buffer is full. This is the easiest
way to make measurements, since it requires no explicit trigger programming.

♦

Use an acquisition trigger to acquire the data. Then use the FETCh commands to return
calculations from the data that was retrieved by the acquisition trigger. This method gives you the
flexibility to synchronize the data acquisition with a transition in the output voltage or current.
FETCh commands do not trigger the acquisition of new measurement data, but they can be used
to return many different calculations from the data that was retrieved by the acquisition trigger.
Note that if you take a voltage measurement, you can fetch only voltage data.

Making triggered measurements with the acquisition trigger system is discussed under "Triggering
Measurements".

NOTE: For each MEASure form of the query, there is a corresponding query that begins with the

header FETCh. FETCh queries perform the same calculation as their MEASure
counterparts, but do not cause new data to be acquired. Data acquired by an explicit
trigger or a previously programmed MEASure command are used.

Voltage and Current Measurements
The SCPI language provides a number of MEASure and FETCh queries which return various

measurement parameters of voltage and current waveforms.

DC Measurements

To measure the dc output voltage or current, use:

MEASure:VOLTage? or
MEASure:CURRent?

Dc voltage and current is measured by acquiring a number of readings at the selected time interval,
applying a Hanning window function to the readings, and averaging the readings. Windowing is a signal
conditioning process that reduces the error in dc measurements made in the presence of periodic signals
such as line ripple. At power-on and after a *RST command, the following parameters are set:

SENSe:SWEep:TINTerval 15.6E-6
SENSe:SWEep:POINts 2048

23

3 - Programming the DC Source
This results in a data acquisition time of 32 milliseconds. Adding a command processing overhead of

about 20 milliseconds results in a total measurement time of about 50 milliseconds per measurement
sample.

Ripple rejection is a function of the number of cycles of the ripple frequency contained in the acquisition
window. More cycles in the aquisition window results in better ripple rejection. If you increase the time
interval for each measurement to 45 microseconds for example, this results in 5.53 cycles in the
acquisition window at 60 Hz, for a ripple rejection of about 70 dB.

Note that the speed of the measurement can be increased by reducing the number of sample points. For
example, the commands

SENSe:SWEep:TINTerval 15E-6
SENSe:SWEep:POINts 1024

speeds up the acquisition period to 16 milliseconds; however, the tradeoff is reduced measurement
accuracy.

RMS Measurements (Agilent 66312A, 66332A Only)

To read the rms content of a voltage or current waveform, use:

MEASure:VOLTage:ACDC? or
MEASure:CURRent:ACDC?

This returns the total rms measurement, including the dc portion.
Making rms measurements on ac waveforms for which a non-integral number of cycles of data has been

acquired may result in measurement errors due to the last partial cycle of acquired data. The instrument
reduces this error by using a Hanning window function when making the measurement.

Minimum and Maximum Measurements (Agilent 66312A, 66332A Only)

To measure the maximum or minimum voltage or current of a pulse or ac waveform, use:

MEASure:VOLTage:MAXimum?
MEASure:VOLTage:MINimum?
MEASure:CURRent:MAXimum?
MEASure:CURRent:MINimum?

Current Ranges
The dc source has two current measurement ranges. The command that controls the ranges is:

SENSe:CURRent:RANGe MIN | MAX

When the range is set to MIN, the maximum current that can be measured is 20 milliamperes.

Returning Measurement Data From the Data Buffer (Agilent 66312A, 66332A Only)

The MEASure and FETCh queries can also return all data values of the instantaneous voltage or current
buffer. The commands are:

MEASure:ARRay:CURRent?
MEASure:ARRay:VOLTage?

24

Programming the DC Source - 3

[

]

Internally Triggered Measurements

You can use the data acquisition trigger system to synchronize the timing of the voltage and current data
acquisition with a BUS or internal trigger source. Then use the FETCh commands to return different
calculations from the data acquired by the measurement trigger.

SCPI Triggering Nomenclature

As previously explained under "Triggering Output Changes", the dc source uses the following sequence
name and alias for the measurement trigger system. This alias can be used instead of the sequence form.

Sequence Form Alias

SEQuence2 ACQuire

Measurement Trigger System Model

Figure 3-2 is a model of the measurement trigger system. The rectangular boxes represent states. The
arrows show the transitions between states. These are labeled with the input or event that causes the
transition to occur.

IDLE STATE

INITIATED STATE

SENSe:SWEep:POINts

ACQUIRED

NO

TRIGger:COUNt

COMPLETE?

YES

INITiate

:IMMediate

TRIGGER RECEIVED

ABORt

*RST
*RCL

Figure 3-2. Model of Measurement Triggers

Initiating the Measurement Trigger System (Agilent 66312A, 66332A Only)

When the dc source is turned on, the trigger system is in the idle state. In this state, the trigger system
ignores all triggers. Sending the following commands at any time returns the trigger system to the Idle
state:

ABORt
*RST
*RCL

The INITiate commands move the trigger system from the Idle state to the Initiated state. This enables
the dc source to receive triggers. To initiate for a measurement trigger, use:

25

3 - Programming the DC Source

INITiate:SEQuence2 or
INITiate:NAME ACQuire

After a trigger is received and the data acquisition completes, the trigger system will return to the Idle state
(unless multiple measurements are desired). Thus it will be necessary to initiate the system each time a
triggered acquisition is desired.

NOTE: You cannot initiate measurement triggers continuously. Otherwise, the measurement data

in the data buffer would continuously be overwritten by each triggered measurement.

Selecting the Measurement Trigger Source (Agilent 66312A, 66332A Only)

The trigger system is waiting for a trigger signal in the Initiated state. Before you generate a trigger, you
must select a trigger source. The following measurement trigger sources can be selected:

BUS - selects GPIB bus triggers.
INTernal - selects the dc source’s output as the measurement trigger.

To select GPIB bus triggers (group execute trigger, device trigger, or *TRG command), use:

TRIGger:SEQuence2:SOURce BUS or
TRIGger:ACQuire:SOURce BUS

To select internal triggers (measurements triggered off the output signal) use:

TRIGger:SEQuence2:SOURce INTernal or
TRIGger:ACQuire:SOURce INTernal

Generating Measurement Triggers (Agilent 66312A, 66332A Only)

There is only one measurement converter in the dc source. Before you generate a measurement trigger,
you must specify a measurement acquistion of either voltage or current. To specify a measurement
acquisition use:

SENSe:FUNCtion "CURRent" or
SENSe:FUNCtion "VOLTage"

Providing that you have specified the appropriate trigger source and a measurement acquisition, you can
generate triggers as follows:

GPIB Triggers Send one of the following commands over the GPIB:

TRIGger:IMMediate (not affected by the trigger source setting)
*TRG
a group execute trigger

Internal Triggers To trigger off of the output signal, you must specify the output level that generates

the trigger, the rising or falling edge of the slope, and a hysteresis to qualify trigger
conditions. This is illustrated in figure 3-3.

26

Q

>

TRIG:ACQ:HYST:CURR <value>

Trigger occurs on rising edge

g

TRIG :AC Q :HYST:V O LT

Trigger occu rs on falling edg e

when signal crosses negative

nal crosses positive

when si
hysteresis band limit

Programming the DC Source - 3

hysteresis band limit

TRIG:A C
TRIG:ACQ:LEV:VOLT

TRIG:ACQ:SLOP:CURR

TRIG:ACQ:SLOP:VOLT

:LEV:CURR <level

TRIG:ACQ:SLOP:CURR NEG

TRIG:ACQ:SLOP:VOLT

Figure 3-3. Trigger Commands Used to Measure Output Pulses

To specify the output level that will generate triggers for both positive- and negative-going signals use:

TRIGger:SEQuence2:LEVel:CURRent <value> or
TRIGger:ACQuire:LEVel:CURRent <value>

To specify the slope on which triggering occurs use the following commands. You can specify a POSitive,
a NEGative, or EITHer type of slope.

TRIGger:SEQuence2:SLOPe:CURRent <slope> or
TRIGger:ACQuire:SLOPe:CURRent <slope>

To specify a hysteresis band to qualify the positive- or negative-going signal use:

TRIGger:SEQuence2:HYSTeresis:CURRent <value> or
TRIGger:ACQuire:HYSTeresis:CURRent <value>

NOTE: When using internal triggers, do not INITiate the measurement until after you have

specified the slope, level, and hysteresis.

When the acquisition finishes, any of the FETCh queries can be used to return the results. Once the
measurement trigger is initiated, if a FETCh query is sent before the data acquisition is triggered or before
it is finished, the response data will be delayed until the trigger occurs and the acquisition completes. This
may tie up the controller if the trigger condition does not occur immediately.

One way to wait for results without tying up the controller is to use the SCPI command completion
commands. For example, you can send the *OPC command after INITialize, then occasionally poll the
OPC status bit in the standard event status register for status completion while doing other tasks. You can
also set up an SRQ condition on the OPC status bit going true, and do other tasks until an SRQ interrupt
occurs.

27

3 - Programming the DC Source

Measuring Output Pulses (Agilent 66312A, 66332A Only)

Current Detector

Check that the current detector is set to ACDC when measuring current pulses or other waveforms with a
frequency content greater than a few kilohertz.

SENSe:CURRent:DETect ACDC

Only select DC as the measurement detector if you are making only DC current measurements and you
require a measurement offset better than 2mA on the High current measurement range. Note that this
selection gives inaccurate results on current waveforms that have ac content.

SENSe:CURRent:DETect DC

Pulse Measurement Queries

The dc source has several measurement queries that return key parameters of pulsewaveforms as shown
in Figure 3-4.

FETC:CURR:MAX?
FETC:VOLT:MAX?

FETC:CURR:HIGH?
FETC:VOLT:HIGH?

FETC:CURR:LOW?

DATA POINTS

FETC:VOLT:LOW?

FETC:CURR:MIN?
FETC:VOLT:MIN?

Figure 3-4. Measurement Commands Used to Return Pulse Data

To return the maximum or minimum value of a pulse waveform use the following commands. Note that
the data points of the measurement sample may not coincide with the actual maximum or minimum point
on the waveform.

FETCh:VOLTage:MAXimum? or
FETCh:VOLTage:MINimum?
FETCh:CURRent:MAXimum? or
FETCh:CURRent:MINimum?

The average value of the high level or low level of a pulse can also be measured. To return the average
value of the high level, use:

FETCh:CURRent:HIGH? or
FETCh:VOLTage:HIGH?

To return the average value of the low level, use:

FETCh:CURRent:LOW? or
FETCh:VOLTage:LOW?

28

Programming the DC Source - 3

Controlling Measurement Samples

Varying the Voltage or Current Sampling Rate

You can vary both the number of data points in a measurement sample, as well as the time between
samples. This is illustrated in Figure 3-5.

<

p

>

<

p

>

Figure 3-5. Sense Commands Used to Vary the Sampling Rate

At *RST, the output voltage or current sampling rate is 15.6 microseconds. This means that it takes about
32 milliseconds to fill up 2048 data points in the data buffer. You can vary this data sampling rate with:

SENSe:SWEep:TINTerval <sample_period>
SENSe:SWEep:POINts <points>

For example, to set the time interval to 46.8 microseconds per sample with 1500 samples, use
SENSe:SWEep:TINTerval 46.8E-6;POINts 1500.

Multiple Measurements (Agilent 66312A, 66332A Only)

The instrument also has the ability to set up several acquisition triggers in succession and average the
results from each acquisition in the returned measurement. To set up the trigger system for a number of
sequential aquisitions use:

TRIGger:ACQuire:COUNt:CURRent <number> or
TRIGger:ACQuire:COUNt:VOLTage <number>

With this setup, the instrument performs each acquisition sequentially, storing the digitized readings in the
internal measurement buffer. It is only necessary to initialize the measurement once at the start; after
each completed aquisition the instrument will wait for the next valid trigger condition to start another. The
results returned by MEASure or FETCh will be the average of the total data acquired.

NOTE: The total number of data points cannot exceed 4096. This means that the product of the

trigger count multiplied by the sweep points cannot exceed 4096; otherwise an error will
occur.

29

3 - Programming the DC Source

Pre-event and Post-event Triggering (Agilent 66312A, 66332A Only)

When a measurement is initiated, the dc source continuously samples either the instantaneous output
voltage or current. As shown in figure 3-6, you can move the block of data being read into the acquisition
buffer with reference to the acquisition trigger. This permits pre-event or post-event data sampling.

=-

=-

=

=

Figure 3-6. Pre-event and Post-event Triggering

To offset the beginning of the acquisition buffer relative to the acquisition trigger, use:

SENSe:SWEep:OFFSet:POINts <offset>

The range for the offset is -4096 to 2,000,000,000 points. As shown in the figure, when the offset is
negative, the values at the beginning of the data record represent samples taken prior to the trigger. When
the value is 0, all of the values are taken after the trigger. Values greater than zero can be used to
program a delay time from the receipt of the trigger until the data points that are entered into the buffer are
valid. (Delay time = Offset X Sample period)

Pulse Measurement Example (Agilent 66312A, 66332A only)

The following program illustrates how to make a pulse measurement over the GPIB. The measurement
function is set to ACDC, which gives the best results for current waveforms that have ac content. The
measurement incorporates 100 readings taken at time intervals of 20 microseconds, for a total
measurement time of 2 milliseconds. The trigger point for the pulse measurement occurs at 0.1 amperes
on the positive slope of the current pulse. The measurement offset is programmed so that 20
measurement points prior to the trigger are also returned as part of the measurement sample.

Because measurement triggers are initiated by the current pulse, a FETCh command is used to return the
measurement data. FETCh commands are also used to return the MAXimum, MINimum, HIGH, and LOW
values of the measurement.

NOTE: MEASure commands cannot be used to return data in this example because they always

acquire NEW measurement data each time they are used.

The program can be run on any controller operating under Agilent BASIC. To generate output pulses, an
electronic load is programmed to generate 3-ampere pulses with a duty cycle of 100 microseconds at
1000 Hz. The power supply address is 705, and the load address is 706. If required, change these
parameters in the appropriate statements.

30

Programming the DC Source - 3

10 !Rev A.00.00
20 OPTION BASE 1
30 DIM Curr_array(100)
40 !
50 ASSIGN @Ps TO 705
60 ASSIGN @Ld TO 706
80 OUTPUT @Ps;"*RST" ! Sets supply to default values
90 OUTPUT @Ps;"OUTP ON" ! Turn on power supply output
100 OUTPUT @Ps;"VOLT 5;CURR 5" ! Program power supply to 5 volts, 5 amps
110 !
120 OUTPUT @Ld;"CURR:LEVEL 0" ! Set up electronic load to produce pulses
130 OUTPUT @Ld;"CURR:TLEVEL 3"
140 !
150 OUTPUT @Ld;"TRAN:FREQ 1000"
160 OUTPUT @Ld;"TRAN:DCYCLE 10"
170 OUTPUT @Ld;"TRAN:MODE CONT"
180 OUTPUT @Ld;"TRAN:STATE ON"
190 !
200 OUTPUT @Ps;"SENS:CURR:DET ACDC" ! Set meter to ACDC
210 OUTPUT @Ps;"SENS:CURR:RANG MAX" ! High Current range
220 OUTPUT @Ps;"TRIG:ACQ:SOUR INT" ! Set to trigger on pulse
230 OUTPUT @Ps;"SENS:FUNC ""CURR""" ! Acquire current reading
240 OUTPUT @Ps;"TRIG:ACQ:LEV:CURR .1" ! Trigger at 0.1 amps
250 OUTPUT @Ps;"TRIG:ACQ:SLOPE:CURR POS" ! Trigger on positive slope
260 OUTPUT @Ps;"TRIG:ACQ:HYST:CURR .05" ! Set hysteresis of trigger
270 OUTPUT @Ps;"SENS:SWE:TINT 20E-6" ! Set sample time interval to 20us
280 OUTPUT @Ps;"SENS:SWE:POIN 100" ! Set number of measurement samples in sweep
290 OUTPUT 705;"SENS:SWE:OFFS:POIN -20" ! Number of sample points before trigger
300 OUTPUT @Ps;"INIT:NAME ACQ" ! Initiate the trigger system.
310 ! Controller now waits for trigger to occur.
320 OUTPUT @Ps;"FETCH:ARRAY:CURR?" ! Get the data after measurement completes.
330 !
340 ENTER @Ps;Curr_array(*) ! Enters all 100 data points
350 PRINT Curr_array(*) ! Print all data points
360 !
370 OUTPUT @Ps;"FETCH:CURR:MAX?" ! Get more data from previous measurement.
380 ENTER @Ps;Curr_max
390 PRINT "MAX CURRENT",Curr_max
400 !
410 OUTPUT @Ps;"FETCH:CURR:MIN?"
420 ENTER @Ps;Curr_min
430 PRINT "MIN CURRENT",Curr_min
440 !
450 OUTPUT @Ps;"FETCH:CURR:HIGH?"
460 ENTER @Ps;Curr_hi
470 PRINT "HIGH CURRENT",Curr_hi
480 !
490 OUTPUT @Ps;"FETCH:CURR:LOW?"
500 ENTER @Ps;Curr_low
510 PRINT "LOW CURRENT",Curr_low
520 !
530 END

When this program runs, it returns 100 measurement data points as well as the MIN, MAX, HIGH, and
LOW data in the following format:

.030585 .031869 .0344369 .031655 .0320829 .0325109 .0333669 .0340089
.0320825 .031449 .031227 .031441 .0337949 .0327249 .031869 .031655
.0327249 .031013 .0325109 .0333669 3.09751 3.1814 3.14266 3.13667

3.13817 3.13624 .977283 .0667496 .0245932 .0280171 .031013 .031655
.0331529 .0350788 .0348648 .0327249 .031227 .0327249 .031227 .030799
.031869 .0329389 .030371 .031655 .031869 .0329389 .031869 .0322869
.0320829 .0325109 .0333669 .0340089 .0348648 .0327249 .031227 .0327249
.0320829 .030371 .031449 .031227 .031441 .0337949 .031449 .0333669
.031441 .0337949 .030371 .031655 .031869 .0329389 .031869 .0293011
.031441 .0337949 .0327249 .031869 .031655 .031655 .0320829 .031227
.0322969 .031655 .0327249 .0340089 2.97661 3.18632 3.14523 3.13496

3.13453 3.13731 1.32438 .0836549 .0258772 .0284451 .0275891 .0329389
.0329389 .0333669 .0322969 .0333669
MAX CURRENT 3.18632
MIN CURRENT .0245932
HIGH CURRENT 3.1371
LOW CURRENT .0314077

31

3 - Programming the DC Source

Programming the Status Registers

You can use status register programming to determine the operating condition of the dc source at any
time. For example, you may program the dc source to generate an interrupt (assert SRQ) when an event
such as a current limit occurs. When the interrupt occurs, your program can then act on the event in the
appropriate fashion.

Figure 3-7 shows the status register structure of the dc source. Table 3-1 defines the status bits. The
Standard Event, Status Byte, and Service Request Enable registers and the Output Queue perform
standard GPIB functions as defined in the

Instrumentation

. The Operation Status and Questionable Status registers implement functions that are

specific to the dc source.

Power-On Conditions

Refer to the *RST command description in chapter 4 for the power-on conditions of the status registers.

QUESTIONABLE STATUS

OCP

N.U.

N.U.

Unreg

N.U.

MeasOvld

N.U.

OPC

N.U.
QYE
DDE
EXE

CME

N.U.

PON

CONDITION

0

OV

1
2

FS

3

4

OT

5-8

9

RI

10

1024

11-13

14
15

STANDARD EVENT STATUS

EVENT ENABLE

0

1

2
3
4
5
6
7

1
2
4

16

512

1

4

8
16
32

128

PTR/NTR

1
2
444

16

512

1024

16384 16384 1638416384

1

4

8
16
32

128

EVENT

1
2

16

512

1024

LOGICAL OR

IEEE 488.2 Standard Digital Interface for Programmable

ENABLE

1
2

16

512

1024

OUTPUT QUEUE

DATA
DATA
DATA

LOGICAL OR

QUEUE

NOT

EMPTY

OFF

N.U.

QUES

MAV

ESB

MSS

OPER

OUTPut:DFI:SOURce

STATUS BYTE

0-2

3

4

5

6

7

8

16

32

64

128

SERVICE

REQUEST

ENABLE

FLT

8

16

32

128

LOGICAL OR

CAL
N.U.
WTG
N.U.

CV

N.U.
CC+

CC­N.U.

32

0

1-4

5

6,7

8
9

10

11

12-15

CONDITION

1

32

256
512

1024
2048

OPERATIO N STATUS

PTR/NTR

1

32

256
512

1024
2048

EVENT

1

32

256
512

1024
2048

ENABLE

1

32

256

512

1024
2048

LOGICAL OR

Figure 3-7. DC Source Status Model

RQS

SERVICE

REQUEST

GENERATION

),**$/

Table 3-1. Bit Configurations of Status Registers

Bit Signal Meaning

0
5
8
10
11

0
1
2
4
9
10
14

0
2
3
4
5
7

3
4
5
6

7

CAL
WTG
CV
CC+
CC-

OV
OCP
FS
OT
RI
Unreg
MeasOvld

OPC
QYE
DDE
EXE
CME
PON

QUES
MAV
ESB
MSS
RQS
OPER

Operation Status Group
The dc source is computing new calibration constants
The dc source is waiting for a trigger
The dc source is in constant voltage mode
The dc source is in constant current mode
The dc source is in negative constant current mode
Questionable Status Group
The overvoltage protection has tripped
The overcurrent protection has tripped
The fuse is blown
The overtemperature protection has tripped
The remote inhibit state is active
The output is unregulated
Current measurement exceeded capability of low range
Standard Event Status Group
Operation complete
Query error
Device-dependent error
Execution error
Command error
Power-on
Status Byte and Service Request Enable Registers
Questionable status summary bit
Message Available summary bit
Event Status Summary bit
Master Status Summary bit
Request Service bit
Operation status summary bit

Programming the DC Source - 3

Operation Status Group

The Operation Status registers record signals that occur during normal operation. As shown below, the
group consists of a Condition, PTR/NTR, Event, and Enable register. The outputs of the Operation Status
register group are logically-ORed into the OPER(ation) summary bit (7) of the Status Byte register.

Register Command Description

Condition
PTR Filter

NTR Filter

Event

Enable

STAT:OPER:COND?

STAT:OPER:PTR <n>

STAT:OPER:NTR <n>

STAT:OPER:EVEN?

STAT:OPER:ENAB <n>

A register that holds real-time status of the circuits being
monitored. It is a read-only register.
A positive transistion filter that functions as described under
STAT:OPER:NTR|PTR commands in chapter 4. It is a
read/write register.
A negative transition filter that functions as described under
STAT:OPER:NTR|PTR commands in chapter 4. It is a
read/write register.
A register that latches any condition that is passed through the
PTR or NTR filters. It is a read-only register that is cleared
when read.
A register that functions as a mask for enabling specific bits
from the Event register. It is a read/write register.

33

3 - Programming the DC Source

Questionable Status Group

The Questionable Status registers record signals that indicate abnormal operation of the dc source. As
shown in figure 3-7, the group consists of the same type of registers as the Status Operation group. The
outputs of the Questionable Status group are logically-ORed into the QUEStionable summary bit (3) of the
Status Byte register.

Register Command Description

Condition STAT:QUES:COND? A register that holds real-time status of the circuits being

monitored. It is a read-only register.

PTR Filter STAT:QUES:PTR <n> A positive transistion filter that functions as described under

STAT:QUES:NTR|PTR commands in chapter 4. It is a
read/write register.

NTR Filter STAT:QUES:NTR <n> A negative transition filter that functions as described under

STAT:QUES:NTR|PTR commands in chapter 4. It is a
read/write register.

Event STAT:QUES:EVEN? A register that latches any condition that is passed through the

PTR or NTR filters. It is a read-only register that is cleared
when read.

Enable STAT:QUES:ENAB <n> A register that functions as a mask for enabling specific bits

from the Event register. It is a read/write register..

Standard Event Status Group

This group consists of an Event register and an Enable register that are programmed by Common
commands. The Standard Event event register latches events relating to instrument communication status
(see figure 3-7). It is a read-only register that is cleared when read. The Standard Event enable register
functions similarly to the enable registers of the Operation and Questionable status groups.

Command Action

*ESE
*PSC ON
*ESR?

The PON (Power On) Bit

The PON bit in the Standard Event event register is set whenever the dc source is turned on. The most
common use for PON is to generate an SRQ at power-on following an unexpected loss of power. To do
this, bit 7 of the Standard Event enable register must be set so that a power-on event registers in the ESB
(Standard Event Summary Bit), bit 5 of the Service Request Enable register must be set to permit an SRQ
to be generated, and *PSC OFF must be sent. The commands to accomplish these conditions are:

*PSC OFF *ESE 128 *SRE 32

programs specific bits in the Standard Event enable register.
clears the Standard Event enable register at power-on.
reads and clears the Standard Event event register.

Status Byte Register

This register summarizes the information from all other status groups as defined in the

Standard Digital Interface for Programmable Instrumentation

Command Action

*STB? reads the data in the register but does not clear it (returns MSS in bit 6)
serial poll clears RQS inside the register and returns it in bit position 6 of the response.

. The bit configuration is shown in Table 3-1.

IEEE 488.2

34

Programming the DC Source - 3

The MSS Bit

This is a real-time (unlatched) summary of all Status Byte register bits that are enabled by the Service
Request Enable register. MSS is set whenever the dc source has one or more reasons for requesting
service. *STB? reads the MSS in bit position 6 of the response but does not clear any of the bits in the
Status Byte register.

The RQS Bit

The RQS bit is a latched version of the MSS bit. Whenever the dc source requests service, it sets the
SRQ interrupt line true and latches RQS into bit 6 of the Status Byte register. When the controller does a
serial poll, RQS is cleared inside the register and returned in bit position 6 of the response. The remaining
bits of the Status Byte register are not disturbed.

The MAV Bit and Output Queue

The Output Queue is a first-in, first-out (FIFO) data register that stores dc source-to-controller messages
until the controller reads them. Whenever the queue holds one or more bytes, it sets the MAV bit (4) of the
Status Byte register.

Determining the Cause of a Service Interrupt

You can determine the reason for an SRQ by the following actions:
Step 1 Determine which summary bits are active. Use:

*STB? or serial poll

Step 2

Step 3 Remove the specific condition that caused the event. If this is not possible, the event

Read the corresponding Event register for each summary bit to determine which events
caused the summary bit to be set. Use:

STATus:QUEStionable:EVENt?
STATus:OPERation:EVENt?
ESR?

When an Event register is read, it is cleared. This also clears the corresponding
summary bit.

may be disabled by programming the corresponding bit of the status group Enable
register or NTR|PTR filter. A faster way to prevent the interrupt is to disable the service
request by programming the appropriate bit of the Service Request Enable register

Servicing Operation Status and Questionable Status Events

This example assumes you want a service request generated whenever the dc source switches to the CC
(constant current) operating mode, or whenever the dc source’s overvoltage, overcurrent, or
overtemperature circuits have tripped. From figure 3-7, note the required path for a condition at bit 10
(CC) of the Operation Status register to set bit 6 (RQS) of the Status Byte register. Also note the required
path for Questionable Status conditions at bits 0, 1, and 4 to generate a service request (RQS) at the
Status Byte register. The required register programming is as follows:

Step 1 Program the Operation Status PTR register to allow a positive transition at bit 10 to be

latched into the Operation Status Event register, and allow the latched event to be
summed into the Operation summary bit. Use:
STATus:OPERation:PTR 1024;ENABle 1024

Step 2

Program the Questionable Status PTR register to allow a positive transition at bits 0,
1, or 4 to be latched into the Questionable Status Event register, and allow the latched

35

3 - Programming the DC Source

event to be summed into the Questionable summary bit. Use:
STATus:QUEStionable:PTR 19;ENABle 19 (1 + 2 + 16 = 19)

Step 3

Step 4

Program the Service Request Enable register to allow both the Operation and the
Questionable summary bits from the Status Byte register to generate RQS. Use:
*SRE 136 (8 + 128 = 136)

When you service the request, read the event registers to determine which Operation
Status and Questionable Status Event register bits are set, and clear the registers for
the next event. Use:
STATus:OPERation:EVENt;QUEStionable:EVENt?

Monitoring Both Phases of a Status Transition

You can monitor a status signal for both its positive and negative transitions. For example, to generate
RQS when the dc source either enters the CC+ (constant current) condition or leaves that condition,
program the Operational Status PTR/NTR filter as follows:

STATus:OPERational:PTR 1024;NTR 1024
STATus:OPERational:ENABle 1024;*SRE 128

The PTR filter will cause the OPERational summary bit to set RQS when CC+ occurs. When the
controller subsequently reads the event register with STATus:OPERational:EVEN?, the register is cleared.
When CC+ subsequently goes false, the NTR filter causes the OPERational summary bit to again set
RQS.

Inhibit/Fault Indicator

The remote inhibit(INH) and discrete fault(FLT) indicators are implemented through the respective INH
and FLT connections on the rear panel. Refer to Table 1-2 for the electrical parameters.

Remote Inhibit (RI)

Remote inhibit is an external, chassis-referenced logic signal routed through the rear panel INH
connection, which allows an external device to signal a fault. To select an operating modes for the remote
inhibit signal, use:

OUTPut:RI:MODE LATChing | LIVE | OFF

Discrete Fault Indicator (DFI)

The discrete fault indicator is an open-collector logic signal connected to the rear panel FLT connection,
that can be used to signal external devices when a fault condition is detected. To select the internal fault
source that drives this signal, use:

OUTPut:DFI:SOURce QUEStionable | OPERation | ESB | RQS | OFF

To enable or disable the DFI output, use:

OUTPut:DFI:STATe ON | OFF

36

Programming the DC Source - 3

Using the Inhibit/Fault Port as a Digital I/O

You can configure the inhibit/fault port to provide a digital input/output to be used with custom digital
interface circuits or relay circuits. As shipped from the factory, the port is shipped for inhibit/fault operation.
You can change the configuration of the port to operate as a general purpose digital input output port with
the following command:

[SOURce:]DIGital:FUNCtion RIDFi | DIGio

The following table shows the bin assignments of the mating plug when used in RI/DFImode as well as
Digital I/O mode. Refer to Table 1-2 for the electrical characteristics of the port.

Pin FAULT/INHIBIT DIGITAL I/O Bit Weight

1 FLT Output OUT 0 0
2 FLT Output OUT 1 1
3 INH Input IN/OUT 2 2
4 INH Common Common not programmable

To program the digital I/O port use:

[SOURce:]DIGital:DATA <data>

where the data is an integer from 0 to 7 that sets pins 1 to 3 according to their binary weight. Refer to the
DIGital:DATA command for more information.

DFI Programming Example

The following program illustrates how to program the DFI port so that it goes low when an OCP condition
turns off the output of the unit. To clear an overcurrent condition, the cause of the condition must first be
removed and then an OUTput:PROTection:CLEar command must be sent. Note that the status event
register will not clear the DFI port until the register is read.

10 !Rev A.00.00
20 ASSIGN @Ps TO 705
30 OUTPUT @Ps;"*RST" ! Sets supply to default values
40 OUTPUT @Ps;"OUTP ON" ! Turn on power supply output
50 OUTPUT @Ps;"VOLT 10;CURR .1" ! Program power supply voltage and current
60 !
70 OUTPUT @Ld;"CURR:PROT:STAT ON" ! Turn on overcurrent protection
80 OUTPUT @Ld;"OUTP:DFI:STAT ON" ! Turn on DFI port
90 OUTPUT @Ld;"OUTP:DFI:SOUR QUES" ! Select DFI bit from Questionable status register
100 OUTPUT @Ld;"STAT:QUES:ENAB 2;PTR 2" ! Unmask bit 2 (OCP) on positive transition
110 !
120 OUTPUT @Ld;"OUTP:PROT:CLE" ! Clears the protection circuit
130 OUTPUT @Ld;"STAT:QUES:EVENT?" ! Clears the Event register and DFI
140 ENTER @Ld;EVENT ! Reads the event and clears the buffer
190 !

37

Language Dictionary

Introduction

This section gives the syntax and parameters for all the IEEE 488.2 SCPI commands and the Common

commands used by the dc source. It is assumed that you are familiar with the material in “Chapter 2 ­"Remote Programming". That chapter explains the terms, symbols, and syntactical structures used here
and gives an introduction to programming. You should also be familiar with “Chapter 4 - Front Panel
Operation” (in the Operating Guide) in order to understand how the dc source functions.

The programming examples are simple applications of SCPI commands. Because the SCPI syntax
remains the same for all programming languages, the examples given for each command are generic.

Syntax Forms Syntax definitions use the long form, but only short form headers (or "keywords")

appear in the examples. Use the long form to help make your program self­documenting.

4

Parameters Most commands require a parameter and all queries will return a parameter.The range

for a parameter may vary according to the model of dc source. When this is the case,
refer to the Specifications table in the Operating Guide.

Models If a command only applies to specific models, those models are listed in the <Model>

Only entry. If there is no <Model> Only entry, the command applies to all models.

Related
Commands

Order of
Presentation

Where appropriate, related commands or queries are included. These are listed
because they are either directly related by function, or because reading about them will
clarify or enhance your understanding of the original command or query.

The dictionary is organized according to the following functions: calibration,
measurement, output, status, system, and trigger. Both the subsystem commands and
the common commands that follow are arranged in alphabetical order under each
function.

Subsystem Commands

Subsystem commands are specific to functions. They can be a single command or a group of
commands. The groups are comprised of commands that extend one or more levels below the root.

The subsystem command groups are grouped according to function: Calibration, Measurement, Output,
Status, System, and Trigger. Commands under each function are grouped alphabetically. Commands
followed by a question mark (?) take only the query form. When commands take both the command and
query form, this is noted in the syntax descriptions. Table 4-1 lists all of the subsystem commands
inalphabetical order.

39

4 - Language Dictionary

Table 4-1. Subsystem Commands Syntax

ABORt Resets the trigger system to the Idle state
CALibrate :
:CURRent
[:SOURce]
[:DC] [:POSitive]

:NEGative
:MEASure
[:DC] :LOWRange Calibrate low current measurement range
:AC Calibrate ac current measurement circuits
:DATA <n> Input a calibration measurement
:LEVel <level> Advance to next calibration step (P1 | P2)
:PASSword <n> Set calibration password
:SAVE Save new cal constants in non-volatile memory
:STATE <bool> [,<n>] Enable or disable calibration mode
:VOLTage
[:DC] Calibrate output voltage and voltage readback
:PROTection Begin voltage protection calibration sequence

DISPlay
[:WINDow]
[:STATe] <bool> Enable/disable front panel display
:MODE <mode> Set display mode (NORM | TEXT)
:TEXT [:DATA] <string> Sets the text that is displayed

INITiate
[:IMMediate]
:SEQuence[<n>] Initiate a specific numbered sequence (1 | 2)
:NAME <name> Initiate a specific named sequence (TRAN | ACQ)
CONTinuous
:SEQuence1, <bool> Set continuous initialization
:NAME TRANsient, <bool> Set continuous initialization

MEASure | FETCh
:ARRay
:CURRent [:DC]? Returns the digitized instantaneous current
:VOLTage [:DC]? Returns the digitized instantaneous voltage
[:SCALar]
:CURRent [:DC]? Returns dc current
:ACDC? Returns the total rms current (ac+dc)
:HIGH? Returns the HIGH level of a current pulse
:LOW? Returns the LOW level of a current pulse
:MAX? Returns maximum current
:MIN? Returns minimum current
:VOLTage [:DC]? Returns dc voltage
:ACDC? Returns the total rms voltage (ac+dc)
:HIGH? Returns the HIGH level of a voltage pulse
:LOW? Returns the LOW level of a voltage pulse
:MAX? Returns maximum voltage
:MIN? Returns minimum voltage

Calibrate positive output current and high current
measurement range
Calibrate negative output current

40

Language Dictionary - 4

Table 4-1. Subsystem Commands Syntax (continued)

OUTPut
[:STATe] <bool> [,NORelay] Enables/disables the dc source output
:DFI
[:STATe] <bool> Enable/disable DFI output
:SOURce <source> Selects event source (QUES | OPER | ESB | RQS | OFF)
:PON
:STATe <state> Set power-on state (*RST | RCL0)
:PROTection
:CLEar Reset latched protection
:DELay <n> Delay after programming/before protection
:RELay
[:STATe] <bool> Opens/closes the external relay contacts
:POLarity <polarity> Sets the external relay polarity (NORM | REV)
:RI
:MODE <mode> Sets remote inhibit input (LATC | LIVE | OFF)
SENSe
:CURRent
[:DC]
RANGe [:UPPer] <n> Selects the high current measurement range
:DETector <detector> Selects the current measurement detector (ACDC | DC)
:FUNCtion <function> Configures the measurement sensor ("VOLT" | "CURR")
:SWEep
:OFFSet
:POINts <n> Defines the offset in the data sweep
:POINts <n> Define the number of data points in a sweep
:TINTerval <n> Sets the digitizer sample spacing
:WINDow [:TYPE] <type> Sets the measurement window function (HANN | RECT)
[SOURce:]
CURRent
[:LEVel]
[:IMMediate][:AMPLitude] <n> Sets the output current level
:TRIGgered [:AMPLitude] <n> Sets the triggered output current level
:PROTection
:STATe <bool> Enable/Disable current limit protection
DIGital
:DATA [:VALue] <n> Sets and reads the digital control port
:FUNCtion <function> Configures digital control port (RIDF | DIG)
VOLTage
[:LEVel]
[:IMMediate][:AMPLitude] <n> Sets the dc voltage level
:TRIGgered [:AMPLitude] <n> Sets the transient voltage level
:ALC
:BANDwidth? | :BWIDth? Returns setting of output mode switch
:PROTection [:LEVel] <n> Sets the overvoltage protection threshold

41

4 - Language Dictionary

Table 4-1. Subsystem Commands Syntax (continued)

STATus
:PRESet Presets all enable and transition registers to power-on
:OPERation
[:EVENt]? Returns the value of the event register
:CONDition? Returns the value of the condition register
:ENABle <n> Enables specific bits in the Event register
:NTRansition<n> Sets the Negative transition filter
:PTRansition<n> Sets the Positive transition filter
:QUEStionable
[:EVENt]? Returns the value of the event register
:CONDition? Returns the value of the condition register
:ENABle <n> Enables specific bits in the Event register
:NTRansition<n> Sets the Negative transition filter
:PTRansition<n> Sets the Positive transition filter
SYSTem
:ERRor? Returns the error number and error string
:LANGuage <language> Sets the programming language (SCPI | COMP)
:VERSion? Returns the SCPI version number
:LOCal Go to local mode (for RS-232 operation)
:REMote Go to remote mode (for RS-232 operation)
:RWLock Go to remote with local lockout (for RS-232 operation)
TRIGger
:SEQuence2 | :ACQuire
[:IMMediate] Triggers the measurement immediately
:COUNt
:CURRent <n> Sets the number of sweeps per current measurement
:VOLTage <n> Sets the number of sweeps per voltage measurement
:HYSTeresis
:CURRent <n> Qualifies the trigger when measuring current
:VOLTage <n> Qualifies the trigger when measuring voltage
:LEVel
:CURRent <n> Sets the trigger level for measuring current
:VOLTage <n> Sets the trigger level for measuring voltage
:SLOPe
:CURRent <slope> Sets the triggered current slope (POS | NEG | EITH)
:VOLTage <slope> Sets the triggered voltage slope (POS | NEG | EITH)
:SOURce <source> Sets the trigger source (BUS | INT)
[:SEQuence1 | :TRANsient]
[:IMMediate] Triggers the output immediately
:SOURce <source> Sets the trigger source (BUS)
:SEQuence1
:DEFine TRANsient Sets or queries the SEQ1 name
:SEQuence2
:DEFine ACQuire Sets or queries the SEQ2 name

42

Language Dictionary - 4

Common Commands

Common commands begin with an * and consist of three letters (command) or three letters and a ?
(query). They are defined by the IEEE 488.2 standard to perform common interface functions. Common
commands and queries are categorized under System, Status, or Trigger functions and are listed at the
end of each group. The dc source responds to the following commands:

Table 4-2. Common Commands Syntax

*CLS Clear status
*ESE <n> Standard event status enable
* ESE? Return standard event status enable
*ESR? Return event status register
*IDN? Return instrument identification
*OPC Enable "operation complete" bit in ESR
*OPC? Return a "1" when operation complete
*OPT? Return option number
*PSC <bool> Power-on status clear state set/reset
*PSC? Return power-on status clear state
*RCL <n> Recall instrument state
*RST Reset
*SAV <n> Save instrument state
*SRE <n> Set service request enable register
*SRE? Return service request enable register
*STB? Return status byte
*TRG Trigger
*TST? Perform selftest, then return result
*WAI Hold off bus until all device commands done

Programming Parameters

The following table lists the output programming parameters for each model.

Table 4-3. Output Programming Parameters

Parameter Value

66312A 66312A 6631B

6611C
[SOUR:]CURR[:LEV][:IMM] MAX
and
[SOUR:]CURR[:LEV]:TRIG MAX
*RST Current Value 10% of MAX value for all models
[SOUR:]VOLT[:LEV][:IMM]MAX
and
[SOUR:]VOLT[:LEV]:TRIG MAX
*RST Voltage Value 0 V for all models
[SOUR:]VOLT:PROT[:LEV] MAX 22 22 12 22 55 110
*RST OVP Value MAX for all models
OUTP:PROT:DEL MAX 2,147,483.647 seconds for all models
*RST Protection Delay Value 0.08 seconds
SENS:CURR:RANG

*RST Current Range Value MAX for all models

2.0475 5.1188 10.237

5.1188

20.475 20.475 8.190 20.475 51.188 102.38

Low range = 0 − 20 mA for all models

High Range = 20 mA − MAX for all models

6632B
6612C

5.1188

2.0475

6633B
6613C

2.0475

1.0238

6634B

6614C

1.0238

0.5118

43

4 - Language Dictionary

Calibration Commands

Calibration commands let you:

u Enable and disable the calibration mode
u Change the calibration password
u Calibrate the current and voltage programming and measurement, and store new calibration

constants in nonvolatile memory.

NOTE: If calibration mode has not been enabled with CALibrate:STATe, programming the

calibration commands will generate an error.

CALibrate:CURRent

This command initiates the calibration of the positive dc output current as well as the high-range current
measurement circuit.

Command Syntax

Parameters

Examples

Related Commands

CALibrate:CURRent[:SOURce][:DC][:POSitive]
None

CAL:CURRCAL:CURR:SOUR:DC:POS

CAL:CURR:NEG

CALibrate:CURRent:NEGative

This command initiates the calibration of the negative dc output current.

Command Syntax

Parameters

Examples

Related Commands

CALibrate:CURRent[:SOURce][:DC]:NEGative
None

CAL:CURR:NEGCAL:CURR:SOUR:DC:NEG

CAL:CURR

CALibrate:CURRent:MEASure:LOWRange

This command initiates the calibration of the low-range current measurement circuit.

Command Syntax

Parameters

Examples

Related Commands

CALibrate:CURRent:MEASure[:DC]:LOWRange
None

CAL:CURR:MEAS

CAL:CURR

CALibrate:CURRent:MEASure:AC

Agilent 66312A, 66332A Only
This command initiates the calibration of the high bandwidth (ac) measurement circuit.

Command Syntax

Parameters

Examples

CALibrate:CURRent:MEASure:AC
None

CAL:CURR:MEAS:AC

44

Language Dictionary - 4

CALibrate:DATA

This command enters a calibration value that you obtain by reading an external meter. You must first
select a calibration level (with CALibrate:LEVel) for the value being entered.

Command Syntax

Parameters

Unit

Examples

Related Commands

CALibrate:DATA<NRf>
<external reading>

A

(amperes)

CAL:DATA 3222.3 MA CAL:DATA 5.000

CAL:STAT CAL:LEV

CALibrate:LEVel

This command selects the next point in the calibration sequence.
P1: the first calibration point

P2: the second calibration point

Command Syntax

Parameters

Examples

CALibrate:LEVel <point>
P1 | P2

CAL:LEV P2

CALibrate:PASSword

This command lets you change the calibration password. A new password is automatically stored in
nonvolatile memory and does not have to be stored with CALibrate:SAVE.

If the password is set to 0, password protection is removed and the ability to enter the calibration mode is
unrestricted.

Command Syntax

Parameters

Examples

Related Commands

CALibrate:PASScode<NRf>
<model number> (default)

CAL:PASS 6812 CAL:PASS 6.1994

CAL:SAV

CALibrate:SAVE

This command saves any new calibration constants after a calibration procedure has been completed in
nonvolatile memory. If CALibrate:STATe OFF is programmed without a CALibrate:SAVE, the previous
calibration constants are restored..

Command Syntax

Parameters

Examples

Related Commands

CALibrate:SAVE
None

CAL:SAVE

CAL:PASS CAL:STAT

45

4 - Language Dictionary

CALibrate:STATe

This command enables and disables calibration mode. The calibration mode must be enabled before the
will accept any other calibration commands.

The first parameter specifies the enabled or disabled state. The second parameter is the password. It is
required if the calibration mode is being enabled and the existing password is not 0. If the password is not
entered or is incorrect, an error is generated and the calibration mode remains disabled. The query
statement returns only the state, not the password.

NOTE: Whenever the calibration state is changed from enabled to disabled, any new calibration

constants are lost unless they have been stored with CALibrate:SAVE.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

CALibrate:STATe<bool>[,<NRf>]
0 | 1 | OFF | ON [,<password>]
OFF

CAL:STAT 1,6812 CAL:STAT OFF
CALibrate:STATe?

<NR1>
CAL:PASS CAL:SAVE *RST

CALibrate:VOLTage

This command initiates the calibration of the output voltage and the voltage readback circuit.

Command Syntax

Parameters

Examples

CALibrate:VOLTage[:DC]
None

CAL:VOLT CAL:VOLT:DC

CALibrate:VOLTage:PROTection

This command can calibrates the overvoltage protection (OV) circuit. The dc source automatically
performs the calibration. CALibrate:VOLTage:PROTection is a sequential command that takes several
seconds to complete.

Command Syntax

Parameters

Examples

CALibrate:VOLTage:PROTection
None

CAL:VOLT:PROT

46

Language Dictionary - 4

Measurement Commands

Measurement commands consist of measure and sense commands.
Measure commands measure the output voltage or current. Measurements are performed by digitizing

the instantaneous output voltage or current for a defined number of samples and sample interval, storing
the results in a buffer, and calculating the measured result. Two types of measurement commands are
available: MEASure and FETCh. MEASure triggers the acquisition of new data before returning the
reading; FETCh returns a reading computed from previously acquired data. If you take a voltage
measurement, you can fetch only voltage data.

♦

Use MEASure when the measurement does not need to be synchronized with any other event.

♦

Use FETCh when it is important that the measurement be synchronized with either a trigger or
with a particular part of the output waveform.

Sense commands control the current measurement range, the bandwidth detector of the , and the data
acquisition sequence.

MEASure:ARRay:CURRent?
FETCh:ARRay:CURRent?

Agilent 66312A, 66332A Only

These queries return an array containing the instantaneous output current in amperes. The output voltage
or output current are digitized whenever a measure command is given or whenever an acquire trigger
occurs. The time interval is set by SENSe:SWEep:TINTerval. The position of the trigger relative to the
beginning of the data buffer is determined by SENSe:SWEep:OFFSet. The number of points returned is
set by SENSe:SWEep:POINts.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure:ARRay:CURRent[:DC]?
FETCh:ARRay:CURRent[:DC]?
None

MEAS:ARR:CURR? FETC:ARR:CURR?

<NR3>
SENS:SWE:TINT SENS:SWE:OFFS SENS:SWE:POIN

MEASure:ARRay:VOLTage?
FETCh:ARRay:VOLTage?

Agilent 66312A, 66332A Only

These queries return an array containing the instantaneous output voltage in volts. The output voltage or
output current are digitized whenever a measure command is given or whenever an acquire trigger
occurs. The time interval is set by SENSe:SWEep:TINTerval. The position of the trigger relative to the
beginning of the data buffer is determined by SENSe:SWEep:OFFSet. The number of points returned is
set by SENSe:SWEep:POINts.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure:ARRay:VOLTage[:DC]?
FETCh:ARRay:VOLTage[:DC]?
None

MEAS:ARR:VOLT? FETC:ARR:VOLT?

<NR3>
SENS:SWE:TINT SENS:SWE:OFFS SENS:SWE:POIN

47

4 - Language Dictionary

MEASure:CURRent?
FETCh:CURRent?

FETCh:CURRent? applies to Agilent 66312A, 66332A Only

These queries return the dc output current.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure:[SCALar]:CURRent[:DC]?
FETCh:[SCALar]:CURRent[:DC]?
None

MEAS:CURR? MEAS:CURR:DC?

<NR3>
MEAS:VOLT?

MEASure:CURRent:ACDC?
FETCh:CURRent:ACDC?

Agilent 66312A, 66332A Only
These queries return the ac+dc rms output current.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure:[SCALar]:CURRent:ACDC?
FETCh:[SCALar]:CURRent:ACDC?
None

MEAS:CURR:ACDC? FETC:CURR:ACDC?

<NR3>
MEAS:VOLT:ACDC?

MEASure:CURRent:HIGH?
FETCh:CURRent:HIGH?

Agilent 66312A, 66332A Only

These queries return the High level current of a current pulse waveform. The instrument first measures
the minimum and maximum data points of the pulse waveform. It then generates a histogram of the pulse
waveform using 1024 bins between the maximum and minimum data points. The bin containing the most
data points above the 50% point is the high bin. The average of all the data points in the high bin is
returned as the High level. If no high bin contains more than 1.25% of the total number of acquired points,
then the maximum value is returned by these queries.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure[SCALar]:CURRent:HIGH?
FETCh[:SCALar]:CURRent:HIGH?
None

MEAS:CURR:HIGH?FETC:CURR:HIGH?

<NR3>
MEAS:CURR:LOW? CALC:REF:HIGH

48

Language Dictionary - 4

MEASure:CURRent:LOW?
FETCh:CURRent:LOW?

Agilent 66312A, 66332A Only

These queries return the Low level current of a current pulse waveform. The instrument first measures the
minimum and maximum data points of the pulse waveform. It then generates a histogram of the pulse
waveform using 1024 bins between the maximum and minimum data points. The bin containing the most
data points below the 50% point is the low bin. The average of all the data points in the low bin is returned
as the Low level. If no low bin contains more than 1.25% of the total number of acquired points, then the
minimum value is returned by these queries.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure[SCALar]:CURRent:LOW?
FETCh[:SCALar]:CURRent:LOW?
None

MEAS:CURR:LOW? FETC:CURR:LOW?

<NR3>
MEAS:CURR:HIGH? CALC:REF:LOW

MEASure:CURRent:MAXimum?
FETCh:CURRent: MAXimum?

Agilent 66312A, 66332A Only

These queries return the maximum output current reading from the measurement sample.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure[:SCALar]:CURRent:MAXimum?
FETCh[:SCALar]:CURRent:MAXimum?
None

MEAS:CURR:MAX? FETC:CURR:MAX?

<NR3>
MEAS:CURR:MIN?

MEASure:CURRent:MINimum?
FETCh:CURRent:MINimum?

Agilent 66312A, 66332A Only

These queries return the minimum output current reading from the measurement sample.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure[:SCALar]:CURRent:MINimum?
FETCh[:SCALar]:CURRent:MINimum?
None

MEAS:CURR:MIN? FETC:CURR:MIN?

<NR3>
MEAS:CURR:MAX?

49

4 - Language Dictionary

MEASure:VOLTage?
FETCh:VOLTage?

FETCh:VOLTage? applies to Agilent 66312A, 66332A Only

These queries return the dc output voltage.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure[:SCALar]:VOLTage[:DC]?
MEASure[:SCALar]:VOLTage[:DC]?
None

MEAS:VOLT? FETC:VOLT:DC?

<NR3>
MEAS:CURR?

MEASure:VOLTage:ACDC?
FETCh:VOLTage:ACDC?

Agilent 66312A, 66332A Only

These queries return the ac+dc rms output voltage.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure[:SCALar]:VOLTage:ACDC?
FETCh[:SCALar]:VOLTage:ACDC?
None

MEAS:VOLT:ACDC? FETC:VOLT:ACDC?

<NR3>
MEAS:CURR:ACDC?

MEASure:VOLTage:HIGH?
FETCh:VOLTage:HIGH?

Agilent 66312A, 66332A Only
These queries return the High level voltage of a voltage pulse waveform. The instrument first measures

the minimum and maximum data points of the pulse waveform. It then generates a histogram of the pulse
waveform using 1024 bins between the maximum and minimum data points. The bin containing the most
data points above the 50% point is the high bin. The average of all the data points in the high bin is
returned as the High level. If no high bin contains more than 1.25% of the total number of acquired points,
then the maximum value is returned by these queries.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure[SCALar]:VOLTage:HIGH?
FETCh[:SCALar]:VOLTage:HIGH?
None

MEAS:VOLT:HIGH? FETC:VOLT:HIGH?

<NR3>
MEAS:VOLT:LOW? CALC:REF:HIGH

50

Language Dictionary - 4

MEASure:VOLTage:LOW?
FETCh:VOLTage:LOW?

Agilent 66312A, 66332A Only

These queries return the Low level voltage of a voltage pulse waveform. The instrument first measures
the minimum and maximum data points of the pulse waveform. It then generates a histogram of the pulse
waveform using 1024 bins between the maximum and minimum data points. The bin containing the most
data points below the 50% point is the low bin. The average of all the data points in the low bin is returned
as the Low level. If no low bin contains more than 1.25% of the total number of acquired points, then the
minimum value is returned by these queries.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure[SCALar]:VOLTage:LOW?
FETCh[:SCALar]:VOLTage:LOW?
None

MEAS:VOLT:LOW? FETC:VOLT:LOW?

<NR3>
MEAS:VOLT:HIGH? CALC:REF:LOW

MEASure:VOLTage:MAXimum?
FETCh:VOLTage:MAXimum?

Agilent 66312A, 66332A Only

These queries return the maximum output voltage reading from the measurement sample.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure[:SCALar]:VOLTage:MAXimum?
FETCh[:SCALar]:VOLTage:MAXimum?
None

MEAS:VOLT:MAX? FETC:VOLT:MAX?

<NR3>
MEAS:VOLT:MIN?

MEASure:VOLTage:MINimum?
FETCh:VOLTage:MINimum?

Agilent 66312A, 66332A Only

These queries return the minimum output voltage reading from the measurement sample.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

MEASure[:SCALar]:VOLTage:MINimum?
FETCh[:SCALar]:VOLTage:MINimum?
None

MEAS:VOLT:MIN? FETC:VOLT:MIN?

<NR3>
MEAS:VOLT:MAX?

51

4 - Language Dictionary

SENSe:CURRent:RANGe

This command selects the dc current measurement range. All models have two current measurement
ranges:

High Range: 0 through MAX (see Table 4-3)
Low Range: 0 through 0.02 A (all models)

The High range covers the full current measurement capability of the instrument. The Low range
measures currents up to a maximum of 20 mA. This increases the low current measurement sensitivity for
greater accuracy and resolution. The value that you program with SENSe:CURRent:RANGe must be the
maximum current that you expect to measure. The instrument will select the range that gives the best
resolution. The crossover value is 20 mA. When queried, the returned value is the maximum current that
can be measured on the range that is presently set.

Command Syntax

Parameters

Unit

*RST Value

Examples

Query Syntax

Returned Parameters

SENSe:CURRent[:DC]:RANGe[:UPPer]<NRf+>
0 through MAX (see table 4-3)

A

(amperes)

MAX (high range)

SENS:CURR:RANG 4.0

SENSe:CURRent:RANGe?
<NR3>

SENSe:CURRent:DETector

Agilent 66312A, 66332A Only

This command lets you select the type of detector used for output current measuremants. Two choices for
detecting current measurements are available:

ACDC

DC

NOTE: This command only applies to the High current measurement range.

This is the preferred choice for all dynamic current measurements. When ACDC is selected,
the measured output current includes the current that flows in the instrument’s output
capacitor. It is especially important to use ACDC detection when measuring pulse or other
waveforms with frequency contents greater than several kilohertz.

DC

Select
offset accuracy better than 2mA on the High current measurement range. When DC is
selected, the component of output current that is supplied by the instrument’s output filter is not
sensed. Note that this selections gives inaccurate results on current waveforms with frequency
contents greater than several kilohertz.

Command Syntax

Returned Parameters

only if you are making dc current measurements and you require a dc measurement

SENSe:CURRent:DETector<detector>

Parameters

*RST Value

Examples

Query Syntax

ACDC or DC
ACDC

SENS:CURR:DET ACDC SENS:CURR:DET DC

SENSe:CURRent:DETect?
<CRD>

52

Language Dictionary - 4

SENSe:FUNCtion

Agilent 66312A, 66332A Only

This command configures the measurement sensor to measure either voltage or current when an acquire
trigger is used. The query returns the function setting, either VOLT or CURR.

Command Syntax

Parameters

Examples

Query Syntax

Returned Parameters

SENSe:FUNCtion <function
"VOLTage" | "CURRent"

SENS:FUNC "VOLT"

SENSe:FUNCtion?
<SRD>

SENSe:SWEep:OFFSet:POINts

Agilent 66312A, 66332A Only

This command defines the offset in a data sweep when an acquire trigger is used. Negative values
represent data samples taken prior to the trigger.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

SENSe:SWEep:OFFSet:POINts <NRf+>

-4095 through 2,000,000,000
0

SENS:SWE:OFFS:POIN -2047

SENSe:SWEep:OFFSet:POINts?
<NR3>
SENS:SWE:TINT SENS:SWE:POIN MEAS:ARR

SENSe:SWEep:POINts

This command defines the number of points in a data sweep.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

SENSe:SWEep:POINts<NRf+>
0 through 4096
2048

SENS:SWE:POIN 1024

SENSe:SWEep:POINts?
<NR3>
SENS:SWE:TINT SENS:SWE:OFFS MEAS:ARR

SENSe:SWEep:TINTerval

This command defines the time period between samples

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

SENSe:SWEep:TINTerval<NRf+>

15.6 microseconds through 31200 seconds

15.6 microseconds

SENS:SWE:TINT 31.2E-6

SENSe:SWEep:TINTerval?
<NR3>
SENS:SWE:POIN SENS:SWE:OFFS MEAS:ARR

53

4 - Language Dictionary

4

SENSe:WINDow

This command sets the window function that is used in output measurement calculations. The following
functions can be selected:

HANNing

A signal conditioning window that reduces errors in dc and rms measurement
calculations in the presence of periodic signals such as line ripple. It also
reduces jitter when measuring successive pulse waveforms. The Hanning
window multiplies each point in the measurement sample by the function cos

.

Do not use the Hanning window when measuring single-shot pulse waveforms.

RECTangular

A window that returns measurement calculations without any signal
conditioning. This window may be used for pulse measurements where the
exact period of the pulse waveform is known and the measurement interval can
be set accordingly using the SENSe:SWEep:TINTerval command.

NOTE: Neither window function alters the instantaneous voltage or current data returned in the

measurement array.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

SENSe:WINDow[:TYPE] <type>
HANNing | RECTangular
HANNing

SENS:WIND RECT

SENSe:WINDow[:TYPE]?
<CRD>

54

Language Dictionary - 4

Output Commands

Output commands consist of output and source commands.
Output commands control the output and digital port functions. They also control the output relay on

units with Relay Option 760.
Source commands program the actual voltage, current, and digital port output.

OUTPut

This command enables or disables the dc source output. The state of a disabled output is a condition of
zero output voltage and a model-dependent minimum source current (see *RST). Unless the NORelay
command is programmed, the OUTput command also controls the output relay on Agilent models
66332A, 6631B, 6632B, 6633B, and 6634B with Relay Option 760. If the NORelay command is sent, the
output relay state does NOT change.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

OUTPut[:STATe] <bool> [,NORelay]
0 | OFF | 1 | ON

0
OUTP 1OUTPUT:STATE ON

OUTPut[:STATe]?
<NR1>0 or 1
*RST *RCL *SAV

OUTPut:DFI

This command enables or disables the discrete fault indicator (DFI) outputfrom the dc source.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

OUTPut:DFI[:STATe]<bool>
0 | 1 | OFF | ON

OFF
OUTP:DFI 1 OUTP:DFI ON

OUTPut:DFI[:STATe]?
0 | 1
OUTP:DFI:SOUR

OUTPut:DFI:SOURce

This command selects the source for discrete fault indicator (DFI) events.The choices are:

QUEStionable
OPERation
ESB
RQS
OFF

Command Syntax

Returned Parameters

Related Commands

selects the Questionable event summary bit (bit 3 of the Status Byte Register)
selects the Operation Event summary bit (bit 7 of the Status Byte Register)
selects the Standard Event summary bit (bit 5 of the Status Byte Register)
selects the Request Service bit (bit 6 of the Status Byte Register)
selects no DFI source

OUTP:DFI:SOUR<source>

Parameters

*RST Value

Examples

Query Syntax

QUES | OPER | ESB | RQS | OFF

OFF
OUTP:DFI:SOUR OPER

OUTPut:DFI:SOUR?
<CRD>
OUTP:DFI

55

4 - Language Dictionary

OUTPut:PON:STATe

This command selects the power-on state of the dc source. This information is saved in non-volatile
memory. The following states can be selected:

RST
RCL0

Returned Parameters

Sets the power-on state to *RST. Refer to the *RST command as described in this chapter
for more information.
Sets the power-on state to *RCL 0. Refer to the *RCL command as described in this
chapter for more information.

Command Syntax

Parameters

Examples

Query Syntax

Related Commands

OUTPut:PON:STATe <state>
RST | RCL0

OUTP:PON:STAT RST

OUTPut:PON:STATe?
<CRD>
*RST *RCL

OUTPut:PROTection:CLEar

This command clears the latch that disables the output when an OverVoltage, OverCurrent,
OverTemperature, Remote Inhibit, or Fuse Status condition is detected. All conditions that generate the
fault must be removed before the latch can be cleared. The output is then restored to the state it was in
before the fault condition occurred.

Command Syntax

Parameters

Examples

Related Commands

OUTPut:PROTection:CLEar
None

OUTP:PROT:CLE

OUTP:PROT:DEL *RCL *SAV

OUTPut:PROTection:DELay

This command sets the time between the programming of an output change that produces a constant
current condition (CC) and the recording of that condition by the Operation Status Condition register. The
delay prevents the momentary changes in status that can occur during reprogramming from being
registered as events by the status subsystem. Since the constant current condition is used to trigger
overcurrent protection (OCP), this command also delays OCP. Overvoltage protection is not affected by
this comand.

Command Syntax

Parameters

Unit

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

OUTPut:PROTection:DELay <NRf+>
0 to 2,147,483.647
seconds

0.08 (Normal)

OUTPUT:PROTECTION:DELAY 75E-1

OUTPut:PROTection:DELay?
<NR3>
OUTP:PROT:CLE *RCL *SAV

56

Language Dictionary - 4

OUTPut:RELay

Agilent 66332A, 6632B, 6633B, 6634B, 6611C, 6612C, 6613C, 6614C Only

This command is only valid for units with Relay Option 760, otherwise an error will occur. Programming
ON closes the output relay contacts; programming OFF opens them. The relay is controlled independently
of the output state. If the dc source is supplying power to a load, that power will appear at the relay
contacts during switching.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

OUTPut:RELay[:STATe]<bool>
0 | 1 | OFF ON
0

OUTP:REL 1OUTP:REL OFF

OUTPput:RELay?
0 | 1
OUTP *RCL *SAV

OUTPut:RELay:POLarity

Agilent 66332A, 6632B, 6633B, 6634B, 6611C, 6612C, 6613C, 6614C Only

This command is only valid for units with Relay Option 760, otherwise an error will occur. Programming
NORMal causes the output relay polarity to be the same as the dc source output. Programming REVerse
causes the relay output polarity to be opposite to that of the dc source output. If OUTPut = ON when either
command is sent, the output voltage is set to 0 during the time that the relays are changing polarity.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

OUTPut:RELay:POLarity<CRD>
NORMal | REVerse
NORM

OUTP:REL:POL NORM

OUTPput:RELay:POLarity?
NORM | REV
OUTP *RCL *SAV

OUTPut:RI:MODE

This command selects the mode of operation of the Remote Inhibit protection. The RI mode is stored in
non-volatile memory. The following modes can be selected:

LATChing

LIVE

OFF

Returned Parameters

Related Commands

causes a TTL low signal on the INH input to disable the output. The only way
to clear the latch is by sending an OUTPut:PROTection:CLEAR command
while the INH input is false.
allows the INH input to disable the output in a non-latching manner. In other
words, the output follows the state of the INH input. When INH is low true, the
output is disabled. When INH is high the output is not affected.
the INH input is disabled.

Command Syntax

Parameters

Examples

Query Syntax

OUTPut:RI:MODE <mode>
LATChing | LIVE | OFF

OUTP:RI:MODE LIVE

OUTPut:RI:MODE?
<CRD>
OUTP:PROT:CLE

57

4 - Language Dictionary

[SOURce:]CURRent

This command sets the immediate current level of the dc source . The immediate level is the current
programmed for the output terminals.

Command Syntax

Parameters

Default Suffix

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

[SOURce]:CURRent[:LEVel][:IMMediate][:AMPLitude]<NRf+>
see Table 4-3
A (amperes)
10% of MAX

CURR 200 MA CURRENT:LEVEL 200 MA

[SOURce]:CURRent[:LEVel][:IMMediate][:AMPLitude]?
<NR3>
CURR:TRIG

[SOURce:]CURRent:TRIGger

This command sets the pending triggered current level of the dc source . The pending triggered level is a
stored current value that is transferred to the output terminals when a trigger occurs. In order for a trigger
to occur, the trigger subsystem must be initiated (see the INITiate command in the trigger subsystem).

Command Syntax

Parameters

Default Suffix

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

[SOURce]:CURRent[:LEVel]:TRIGgered[:AMPLitude]<NRf+>
see Table 4-3

A

( amperes)

10% of MAX

CURR:TRIG 1CURRENT:LEVEL:TRIGGERED 1

SOURce]:CURRent[LEVel]:TRIGgered[:AMPLitude]?
<NR3>
INIT CURR

[SOURce:]CURRent:PROTection:STATe

This command enables or disables the overcurrent protection (OCP) function. If the dc source overcurrent
protection function is enabled and the dc source goes into constant current operation, then the output is
disabled and the Questionable Condition status register OC bit is set (see chapter 3 under Programming
the Status Registers). Note that the [SOURce:]CURRent command sets the current limit, which
determines when the dc source goes into constant current operation. An overcurrent condition can be
cleared with the OUTPut:PROTection:CLEar command after the cause of the condition is removed.

NOTE: Use OUTP:PROT:DEL to prevent momentary current limit conditions caused by

programmed output changes from tripping the overcurrent protection.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

[SOURce]:CURRent:PROTection:STATe <bool>
0 | 1 | OFF | ON
OFF

CURR:PROT:STAT 0CURRENT:PROTECTION:STATE OFF
CURR:PROT:STAT 1CURRENT:PROTECTION:STATE ON

Syntax [SOURce]:CURRent:PROTection:STATe?
<NR1>0 or 1
OUTP:PROT:CLE *RST

58

Language Dictionary - 4

[SOURce:]DIGital:DATA

This command sets and reads the dc source digital control port when that port is configured for Digital I/O
operation. The port has three signal pins and a digital ground pin. Pins 1 and 2 are output pins controlled
by bits 0 and 1. Pin 3 is controlled by bit 2, and can be programmed to serve either as an input or an
output. It normally serves as an output. Bit 2 must be programmed high to use pin 3 as an input. Pin 4 is
the digital ground. The query returns the last programmed value in bits 0 and 1 and the value read at pin 3
in bit 2.

Program

Value

0 0 0 0 GND Output Lo Lo
1 0 0 1 GND Output Lo Hi
2 0 1 0 GND Output Hi Lo
3 0 1 1 GND Output Hi Hi
4 1 0 0 GND Intput Lo Lo
5 1 0 1 GND Intput Lo Hi
6 1 1 0 GND Intput Hi Lo
7 1 1 1 GND Intput Hi Hi

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

Bit Configuration

2 1 0

Pin Setting

4 3 2 1

[SOURce]:DIGital:DATA[:VALue] <NRf>
0 to 7
0

DIG:DATA 7

[SOURce]:DIGital:DATA?
<NR1>
DIG:FUNC

[SOURce:]DIGital:FUNCtion

This command configures the dc source digital control port. The configuration setting is saved in non­volatile memory.

RIDFi
DIGio

Returned Parameters

Configures the port for Remote Inhibit/Discrete Fault Interrupt operation
Configures the port for Digital input/output operation (see DIG:DATA)

Command Syntax

Parameters

Examples

Query Syntax

[SOURce]:DIGital:FUNCtion <CRD>
RIDFi | DIGio

DIG:FUNC DIG

[SOURce]:DIGital:FUNC?
<CRD>

Related Commands

DIG:DATA

[SOURce:]VOLTage

This command sets the output voltage level of the dc source.

Command Syntax

Parameters

Default Suffix

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

[SOURce]:VOLTage[:LEVel][:IMMediate][:AMPLitude]<NRf+>
see Table 4-3
V (volts)
0

VOLT 2 VOLTAGE:LEVEL 200 MV

[SOURce]:VOLTage[:LEVel][:IMMediate][:AMPLitude]?
<NR3>
VOLT:TRIG

59

4 - Language Dictionary

[SOURce:]VOLTage:ALC:BANDwidth?
[SOURce:]VOLTage:ALC:BWIDth?

Agilent 66332A, 6631B, 6632B, 6633B and 6634B Only
These queries return the setting of the output mode switch. The output mode switch is used to connect or

disconnect the the output capacitor located inside the unit. The returned value is 15,000 if the switch is set
to Normal and 60,000 if the switch is set to Fast.

Query Syntax

Examples

Returned Parameters

[SOURce]:VOLTage:ALC:BANDwidth?
[SOURce]:VOLTage:ALC:BWIDth?
VOLT:ALC:BAND? VOLTAGE:ALC:BWIDth?
<NR3>

[SOURce:]VOLTage:TRIGger

This command sets the pending triggered voltage level of the dc source. The pending triggered level is a

stored voltage value that is transferred to the output terminals when a trigger occurs. In order for a trigger
to occur, the trigger subsystem must be initiated (see the INITiate command in the trigger subsystem).

Command Syntax

Parameters

Default Suffix

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

[SOURce][:VOLTage[:LEVel]:TRIGgered[:AMPLitude]<NRf+>
see Table 4-3
V (volts)
0

VOLT:TRIG 20 VOLTAGE:LEVEL:TRIGGERED 20

[SOURce]:VOLTage[LEVel]:TRIGgered[:AMPLitude]?
<NR3>
VOLT *RST

[SOURce:]VOLTage:PROTection

This command sets the overvoltage protection (OVP) level of the dc source. If the output voltage exceeds
the OVP level, then the dc source output is disabled and the Questionable Condition status register OV bit
is set (see chapter 3 under Programming the Status Registers). An overvoltage condition can be cleared
with the OUTP:PROT:CLE command after the condition that caused the OVP trip is removed. The OVP
always trips with zero delay and is unaffected by the OUTP:PROT:DEL command.

Command Syntax

Parameters

Default Suffix

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

[SOURce]:VOLTage:PROTection[:LEVel]<NRf+>
see Table 4-3
V (volts)
MAX

VOLT:PROT 21.5 VOLT:PROT:LEV MAX

[SOURce]:VOLTage:PROTection[:LEVel]?
<NR3>
OUTP:PROT:CLE OUTP:PROT:DEL

60

Language Dictionary - 4

Status Commands

Status commands program the dc source status registers. The dc source has three groups of status
registers; Operation, Questionable, and Standard Event. The Standard Event group is programmed with
Common commands as described later in this section. The Operation and Questionable status groups
each consist of the Condition, Enable, and Event registers and the NTR and PTR filters. Chapter 3 under
"Programming the Status Registers" explains how to read specific register bits and use the information
they return.

Common commands also perform status functions. The following common commands are discussed in
this section: *CLS *ESE *SR? *OPC *PSC *SRE *STB *WAI.

STATus:PRESet

This command sets all defined bits in the Status Subsystem PTR registers and clears all bits in the
subsytem NTR and Enable registers.

Command Syntax

Parameters

Examples

Table 4-4. Bit Configuration of Operation Status Registers
Bit Position
Bit Name

Bit Weight

CAL = The dc source is computing new calibration constants.
WTG = The dc source is waiting for a trigger.
CV = The dc source is operating in constant voltage mode.
CC+ = The dc source is operating in constant current mode.
CC = The dc source is operating in negative constant current mode.

15–12 11 10 9 8 7-6 5 4-1 0

not

used

2048 1024 256 32 1

STATus:PRESet
None

STAT:PRES STATUS:PRESET

CC- CC+ not

used

CV not

used

WTG not

used

CAL

STATus:OPERation?

This query returns the value of the Operation Event register. The Event register is a read-only register
which holds (latches) all events that are passed by the Operation NTR and/or PTR filter. Reading the
Operation Event register clears it.

Query Syntax

Parameters

Returned Parameters

Examples

Related Commands

STATus:OPERtion[:EVENt]?
None
<NR1>(Register Value)
STAT:OPER? STATUS:OPERATIONAL:EVENT?
*CLS STAT:OPER:NTR STAT:OPER:PTR

STATus:OPERation:CONDition?

This query returns the value of the Operation Condition register. That is a read-only register which holds
the real-time (unlatched) operational status of the dc source .

Query Syntax

Parameters

Examples

Returned Parameters

STATus:OPERation:CONDition?
None

STAT:OPER:COND? STATUS:OPERATION:CONDITION?

<NR1> (register value)

61

4 - Language Dictionary

STATus:OPERation:ENABle

This command and its query set and read the value of the Operational Enable register. This register is a
mask for enabling specific bits from the Operation Event register to set the operation summary bit (OPER)
of the Status Byte register. This bit (bit 7) is the logical OR of all the Operatonal Event register bits that are
enabled by the Status Operation Enable register.

Command Syntax

Parameters

Preset Value

Examples

Query Syntax

Returned Parameters

Related Commands

STATus:OPERation:ENABle<NRf>
0 to 32727

0
STAT:OPER:ENAB 1312STAT:OPER:ENAB 1
STATUS:OPERATION:ENABLE?

STATus:OPERation:ENABle?
<NR1> (register value)
STAT:OPER:EVEN

STATus:OPERation:NTR
STATus:OPERation:PTR

These commands set or read the value of the Operation NTR (Negative-Transition) and PTR (Positive­Transistion) registers. These registers serve as polarity filters between the Operation Enable and
Operation Event registers to cause the following actions:

u When a bit in the Operation NTR register is set to 1, then a 1-to-0 transition of the corresponding

bit in the Operation Condition register causes that bit in the Operation Event register to be set.

u When a bit of the Operation PTR register is set to 1, then a 0-to-1 transition of the corresponding

bit in the Operation Condition register causes that bit in the Operation Event register to be set.

u If the same bits in both NTR and PTR registers are set to 1, then any transition of that bit at the

Operation Condition register sets the corresponding bit in the Operation Event register.

u If the same bits in both NTR and PTR registers are set to 0, then no transition of that bit at the

Operation Condition register can set the corresponding bit in the Operation Event register.

Command Syntax

Parameters

Preset Value

Examples

Query Syntax

Returned Parameters

Related Commands

STATus:OPERtion:NTRansition<NRf>
STATus:OPERtion:PTRansition<NRf>
0 to 32727

NTR register = 0; PTR register = 32727
STAT:OPER:NTR 32 STAT:OPER:PTR 1312

STAT:OPER:NTR? STAT:OPER:PTR?
<NR1> (register value)
STAT:OPER:ENAB

62

Language Dictionary - 4

Table 4-5. Bit Configuration of Questionable Status Registers

Bit Position 15 14 13-11 10 9 8-5 4 3 2 1 0
Bit Name not

used

Bit Weight 16384 1024 512 16 4 2 1

Meas

Ovld

not

used

Unreg RI not

used

OT not

used

FS OCP OV

OV = overvoltage protection has tripped
OCP = overcurrent protection has tripped
FS = the fuse is blown
OT = overtemperature protection has tripped
RI = remote inhibit is active
Unreg = output is unregulated
Meas Ovld = measurement overload

STATus:QUEStionable?

This query returns the value of the Questionable Event register. The Event register is a read-only register
which holds (latches) all events that are passed by the Questionable NTR and/or PTR filter. Reading the
Questionable Event register clears it.

Query Syntax

Parameters

Examples

Returned Parameters

Related Commands

STATus:QUEStionable[:EVENt]?
None

STAT:QUES? STATUS:QUESTIONABLE:EVENT?

<NR1> (register value)
*CLS STAT:QUES:ENAB
STAT:QUES:NTR STAT:QUES:PTR

STATus:QUEStionable:CONDition?

This query returns the value of the Questionable Condition register. That is a read-only register which
holds the real-time (unlatched) questionable status of the dc source.

Query Syntax

Parameters

Examples

Returned Parameters

STATus:QUEStionable:CONDition?
None

STAT:QUES:COND? STATUS:QUESTIONABLE:CONDITION?

<NR1> (register value)

STATus:QUEStionable:ENABle

This command and its query set and read the value of the Questionable Enable register. This register is a
mask for enabling specific bits from the Questionable Event register to set the questionable summary bit
(QUES) of the Status Byte register. This bit (bit 3) is the logical OR of all the Questionable Event register
bits that are enabled by the Questionable Status Enable register..

Command Syntax

Parameters

Preset Value

Examples

Query Syntax

Returned Parameters

Related Commands

STATus:QUEStionable:ENABle<NRf>
0 to 32767

0
STAT:QUES:ENAB 20 STAT:QUES:ENAB 16

STATus:QUEStionable:ENABle?
<NR1> (register value)
STAT:QUES?

63

4 - Language Dictionary

STATus:QUEStionable:NTR
STATus:QUEStionable:PTR

These commands allow you to set or read the value of the Questionable NTR (Negative-Transition) and
PTR (Positive-Transistion) registers. These registers serve as polarity filters between the Questionable
Enable and Questionable Event registers to cause the following actions:

u When a bit of the Questionable NTR register is set to 1, then a 1-to-0 transition of the

corresponding bit of the Questionable Condition register causes that bit in the Questionable Event
register to be set.

u When a bit of the Questionable PTR register is set to 1, then a 0-to-1 transition of the

corresponding bit in the Questionable Condition register causes that bit in the Questionable Event
register to be set.

u If the same bits in both NTR and PTR registers are set to 1, then any transition of that bit at the

Questionable Condition register sets the corresponding bit in the Questionable Event register.

u If the same bits in both NTR and PTR registers are set to 0, then no transition of that bit at the

Questionable Condition register can set the corresponding bit in the Questionable Event register.

Command Syntax

Parameters

Preset Value

Examples

Query Syntax

Returned Parameters

Related Commands

STATus:QUEStionable:NTRansition<NRf>
STATus:QUEStionable:PTRansition<NRf>
0 to 32727

NTR register = 0; PTR register = 32727
STAT:QUES:NTR 16 STATUS:QUESTIONABLE:PTR 512

STAT:QUES:NTR?STAT:QUES:PTR?
<NR1>(Register value)
STAT:QUES:ENAB

*CLS

This command causes the following actions (see chapter 3 under Programming the Status Registers, for
the descriptions of all registers):

u Clears the following registers:

•

Standard Event Status

•

Operation Status Event

•

Questionable Status Event

•

Status Byte

u Clears the Error Queue
u If *CLS immediately follows a program message terminator (<NL>), then the output queue and the

MAV bit are also cleared.

Command Syntax

Parameters

*CLS
None

64

Language Dictionary - 4

*ESE

This command programs the Standard Event Status Enable register bits. The programming determines
which events of the Standard Event Status Event register (see *ESR?) are allowed to set the ESB (Event
Summary Bit) of the Status Byte register. A "1" in the bit position enables the corresponding event. All of
the enabled events of the Standard Event Status Event Register are logically ORed to cause the Event
Summary Bit (ESB) of the Status Byte Register to be set. The query reads the Standard Event The query
reads the Standard Event Status Enable register.

Table 4-6. Bit Configuration of Standard Event Status Enable Register

Bit Position 7 6 5 4 3 2 1 0
Bit Name PON 0 CME EXE DDE QUE 0 OPC
Bit Weight 128 64 32 16 8 4 2 1

PON = Power-on has occurred
CME = Command error
EXE = Execution error

Command Syntax

Parameters

Power-On Value

Examples

Query Syntax

Returned Parameters

Related Commands

*ESE <NRf>
0 to 255
(See *PSC)

*ESE 129

*ESE?
<NR1>(Register value)
*ESR? *PSC *STB?

DDE = Device-dependent error
QUE = Query error

OPC = Operation complete

CAUTION: If *PSC is programmed to 0, the *ESE command causes a write cycle to nonvolatile

memory. Nonvolatile memory has a finite maximum number of write cycles. Programs
that repeatedly cause write cycles to nonvolatile memory can eventually exceed the
maximum number of write cycles and cause the memory to fail.

*ESR?

This query reads the Standard Event Status Event register. Reading the register clears it. The bit
configuration is the same as the Standard Event Status Enable register (see *ESE).

Query Syntax

Parameters

Returned Parameters

Related Commands

*ESR?
None
<NR1>(Register binary value)
*CLS *ESE *ESE? *OPC

*OPC

This command causes the instrument to set the OPC bit (bit 0) of the Standard Event Status register when
the has completed all pending operations. (See *ESE for the bit configuration of the Standard Event
Status register.)

u all commands sent before *OPC have been executed. This includes overlapped commands. Most

commands are sequential and are completed before the next command is executed. Overlapped
commands are executed in parallel with other commands. Commands that affect output voltage,
current or state, relays, and trigger actions are overlapped with subsequent commands sent to the
dc source. The *OPC command provides notification that all overlapped commands have been
completed.

Pending operations

are complete when:

u all triggered actions are completed

65

4 - Language Dictionary
* OPC does not prevent processing of subsequent commands, but bit 0 will not be set until all pending

operations are completed.
*OPC? causes the instrument to place an ASCII "1" in the Output Queue when all pending operations are

completed. Unlike *OPC, *OPC? prevents processing of all subsequent commands. It is intended to be
used at the end of a command line so that the application program can then monitor the bus for data until
it receives the "1" from the dc source Output Queue.

Command Syntax

Parameters

Query Syntax

Returned Parameters

Related Commands

*OPC
None
*OPC?
<NR1> 1
*OPC *TRIG *WAI

*PSC

This command controls the automatic clearing at power-on of the Service Request Enable and the
Standard Event Status Enable registers

*PSC ON | 1
*PSC OFF | 0

The query returns the current state of *PSC.

Returned Parameters

CAUTION: *PSC causes a write cycle to nonvolatile memory. Nonvolatile memory has a finite

causes these registers to be cleared at power-on. This prevents a PON event from
generating SRQ at power-on.
causes the contents of the Standard Event Enable and Service Request Enable registers
to be saved in nonvolatile memory and recalled at power-on. This allows a PON event to
generate SRQ at power-on.

Command Syntax

Parameters

Example

Query Syntax

Related Commands

maximum number of write cycles. Programs that repeatedly cause write cycles to
nonvolatile memory can eventually exceed the maximum number of write cycles and
cause the memory to fail.

*PSC <Bool>
0 | 1 | OFF | ON

*PSC 0 *PSC 1

*PSC?
<NR1>0|1
*ESE *SRE

*SRE

This command sets the condition of the Service Request Enable Register. This register determines which
bits from the Status Byte Register (see *STB for its bit configuration) are allowed to set the Master Status
Summary (MSS) bit and the Request for Service (RQS) summary bit. A 1 in any Service Request Enable
Register bit position enables the corresponding Status Byte Register bit and all such enabled bits then are
logically ORed to cause Bit 6 of the Status Byte Register to be set.

When the controller conducts a serial poll in response to SRQ, the RQS bit is cleared, but the MSS bit is
not. When *SRE is cleared (by programming it with 0), the dc source cannot generate an SRQ to the
controller.

The query returns the current state of *SRE.

66

Language Dictionary - 4

Command Syntax

Parameters

Power-on Value

Example

Query Syntax

Returned Parameters

Related Commands

*SRE <NRf>
0 to 255
see *PSC

*SRE 20

*SRE?
<NR1> (register binary value)
*ESE *ESR *PSC

CAUTION: If *PSC is programmed to 0, the *SRE command causes a write cycle to nonvolatile

memory. Nonvolatile memory has a finite maximum number of write cycles. Programs
that repeatedly cause write cycles to nonvolatile memory can eventually exceed the
maximum number of write cycles and cause the memory to fail.

*STB?

This query reads the Status Byte register, which contains the status summary bits and the Output Queue
MAV bit. Reading the Status Byte register does not clear it. The input summary bits are cleared when the
appropriate event registers are read. The MAV bit is cleared at power-on, by *CLS’ or when there is no
more response data available.

A serial poll also returns the value of the Status Byte register, except that bit 6 returns Request for Service
(RQS) instead of Master Status Summary (MSS). A serial poll clears RQS, but not MSS. When MSS is
set, it indicates that the has one or more reasons for requesting service.

Table 4-7. Bit Configuration of Status Byte Register

Bit Position 7 6 5 4 3 2 1 0
Bit Name OPER MSS

(RQS)

Bit Weight 128 64 32 16 8 4 2 1

ESB = Event status byte summary
MAV = Message available

MSS = Master status summary

Query Syntax

Returned Parameters

ESB MAV QUES 0 0 0

OPER = Operation status summary
QUES = Questionable status summary

RQS = Request for service

*STB?
<NR1>(Register binary value)

*WAI

This command instructs the dc source not to process any further commands until all pending operations
are completed. "Pending operations" are as defined under the *OPC command. *WAI can be aborted
only by sending the dc source an GPIB DCL (Device Clear) command.

Command Syntax

Parameters

Related Commands

WAI?
None
*OPC*OPC?

67

4 - Language Dictionary

System Commands

System commands consist of system, display, and common commands.
System commands commands control system functions that are not directly related to output control or

measurement functions.
Display commands control the front panel display of the .
Common commands also perform system functions. The following common commands are discussed in

this section: *IDN? *OPT? *RCL *RST *SAV *TST?.

DISPlay

This command turns the front panel display on or off. When off, the front panel display is blank. The
display annunciators are not affected by this command.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

DISPlay[:WINDow][:STATe] <bool>
0 | 1| OFF| ON
ON

DISP ON DISPLAY:STATE ON

DISPlay[:WINDow][STATe]?
<NR1> 0 or 1
DISP:MODE DISP:TEXT *RST

DISPlay:MODE

Switches the display between its normal instrument functions and a mode in which it displays text sent by
the user. Text messages are defined with the DISPlay:TEXT command.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

DISPlay[:WINDow]:MODE NORMal|TEXT
<CRD>NORMal | TEXT
NORM
DISP:MODE NORM DISPLAY:MODE TEXT
DISPlay[:WINDow]:MODE?
<CRD> NORMAL or TEXT
DISP DISP:TEXT *RST

DISPlay:TEXT

This command sends character strings to the display when the display mode is set to TEXT. The
character string is case-sensitive and must be enclosed in either single () or double () quotes. The display
is capable of showing up to 14 characters. Strings exceeding 14 characters will be truncated.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

DISPlay[:WINDow]:TEXT [:DATA] <display_string>
<display string>
null string

DISP:TEXT "DEFAULT_MODE"

DISPLAY:WINDOW:TEXT:DATA ‘533.2E-1VOLTS’
DISPlay[:WINDow]:TEXT?
<STR>(Last programmed text string)
DISP DISP:MODE

68

Language Dictionary - 4

SYSTem:ERRor?

This query returns the next error number followed by its corresponding error message string from the
remote programming error queue. The queue is a FIFO (first-in, first-out) buffer that stores errors as they
occur. As it is read, each error is removed from the queue. When all errors have been read, the query
returns 0,NO ERROR. If more errors are accumulated than the queue can hold, the last error in the queue
will be -350,TOO MANY ERRORS (see Appendix C for other error codes).

You can use the front panel Error key to read errors from the queue. Errors generated at the front panel
are not put into the queue but appear immediately on the display.

Query Syntax

Parameters

Returned Parameters

Examples

SYSTem:ERRor?
(None)

<NR1>,<SRD>

SYST:ERR?SYSTEM:ERROR?

SYSTem:LANGuage

This command switches the instrument between its SCPI command language and its compatibility
language. The compatibility language is provided for emulation of older dc source systems and is
described in Appendix B . Sending the command causes:

♦

The selected language to become active and to be stored in nonvolatile memory.

♦

The to reset to its power-on state.

If the dc source is shut off, it will resume operation in the last-selected language when power is restored.
Note that this command and query can be used regardless of the language that is presently selected.

Command Syntax

Parameters

Power-on Value

Example

Query Syntax

Returned Parameters

SYSTem:LANGuage<string>
SCPI | COMPatibility

last selected language

SYST:LANG SCPI SYSTEM:LANGUAGE COMPATIBILITY

SYSTem:LANGuage?
<CRD>

SYSTem:VERSion?

This query returns the SCPI version number to which the complies. The returned value is of the form
YYYY.V, where YYYY represents the year and V is the revision number for that year.

Query Syntax

Parameters

Returned Parameters

Examples

SYSTem:VERSion?
(none)
<NR2>

SYST:VERS?SYSTEM:VERSION?

69

4 - Language Dictionary

SYSTem:LOCal

For RS-232 Operation Only

This command places the dc source in local mode during RS-232 operation. The front panel keys are
functional.

Command Syntax

Parameters

Example

Related Commands

SYSTem:LOCal
None

SYST:LOC

SYST:REM SYST:RWL

SYSTem:REMote

For RS-232 Operation Only

This command places the dc source in remote mode during RS-232 operation. This disables all front
panel keys except the Local key. Pressing the Local key while in the remote state returns the front panel to
the local state.

Command Syntax

Parameters

Example

Related Commands

SYSTem:REMote
None

SYST:REM

SYST:LOC SYST:RWL

SYSTem:RWLock

For RS-232 Operation Only

This command places the dc source in remote mode during RS-232 operation. All front panel keys
including the Local key are disabled. Use SYSTem:LOCal to return the front panel to the local state.

Command Syntax

Parameters

Example

Related Commands

SYSTem:RWLock
None

SYST:RWL

SYST:REM SYST:LOC

*IDN?

This query requests the dc source to identify itself. It returns a string composed of four fields separated by
commas.

Query Syntax

Returned Parameters

Example

70

*IDN?
<AARD> Field Information

Agilent Technologies Manufacturer
xxxxxA model number followed by a letter suffix
nnnnA-nnnnn 10-character serial number or 0
<A>.xx.xx Revision levels of firmware.

AGILENT,66312A,0,A.00.01

Language Dictionary - 4

*OPT?

This query requests the dc source to identify any options that are installed. Options are identified by

0

number A

indicates no options are installed.

Query Syntax

Returned Parameters

*OPT?
<AARD>

*RCL

WARNING: Recalling a previously stored state may place hazardous voltages at the dc source output.

This command restores the dc source to a state that was previously stored in memory with the *SAV
command to the specified location. All states are recalled with the following exceptions:

u the trigger system is set to the Idle state by an implied ABORt command (this cancels any

uncompleted trigger actions)

u the calibration function is disabled by setting CAL:STATe to OFF

NOTE: The device state stored in location 0 is automatically recalled at power turn-on when the

OUTPut:PON:STATe is set to RCL0.

Command Syntax

Parameters

Example

Related Commands

*RCL <NRf>
0 | 1 | 2 | 3

*RCL 3

*PSC *RST *SAV

*RST

This command resets the to a factory-defined state as defined in the following table. *RST also forces an
ABORt command.

Command Syntax

Parameters

Related Commands

*RST
None
*PSC *SAV

71

4 - Language Dictionary

Table 4-8. *RST Settings

CAL:STAT OFF [SOUR:]CURR 10% of MAX*
DIG:DATA 0 [SOUR:]CURR:TRIG 10% of MAX*
DISP:STAT ON [SOUR:]CURR:PROT:STAT OFF
DISP:MODE NORM [SOUR:]LIST:COUN 0

DISP:TEXT ‘ ‘ [SOUR:]VOLT 0
INIT:CONT OFF [SOUR:]VOLT:TRIG 0
OUTP OFF [SOUR:]VOLT:PROT MAX*
OUTP:DFI OFF TRIG:ACQ:COUN:CURR 1
OUTP:DFI:SOUR OFF TRIG:ACQ:COUN:VOLT 1
OUTP:PROT:DEL .08 Norm; .008 Fast TRIG:ACQ:HYST:CURR 0
OUTP:REL OFF TRIG:ACQ:HYST:VOLT 0
OUTP:REL:POL NORM TRIG:ACQ:LEV:CURR MAX*
SENS:CURR:RANG MAX TRIG:ACQ:LEV:VOLT MAX*
SENS:CURR:DET ACDC TRIG:ACQ:SLOP:CURR POS
SENS:FUNC VOLT TRIG:ACQ:SLOP:VOLT POS
SENS:SWE:OFFS:POIN 0 TRIG:ACQ:SOUR INTERNAL
SENS:SWE:POIN 2048 TRIG:TRAN:SOUR BUS
SENS:SWE:TINT 15.6 µs

* Maximum values are model-dependent. Refer to Table 4-3.

*SAV

This command stores the present state of the dc source to the specified location in non-volatile memory.
Up to 4 states can be stored. If a particular state is desired at power-on, it should be stored in location 0. It
will then be automatically recalled at power turn-on if OUTPut:PON:STATe is set to RCL0. *RCL retrieves
instrument states.

Command Syntax

Parameters

Example

Related Commands

*SAV <NRf>
0 | 1 | 2 | 3

*SAV 3

*RCL *RST

CAUTION: *SAV causes a write cycle to nonvolatile memory. Nonvolatile memory has a finite

maximum number of write cycles. Programs that repeatedly cause write cycles to
nonvolatile memory can eventually exceed the maximum number of write cycles and
cause the memory to fail.

*TST?

This query causes the to do a self-test and report any errors. 0 indicates that the dc source passed self­test. 1 indicates that one or more tests failed. Selftest errors are written to the error queue (see Appendix
C).

72

Query Syntax

Returned Parameters

TST?
<NR1>

Language Dictionary - 4

Trigger Commands

Trigger commands consist of trigger and initiate commands.
Trigger commands control the remote triggering of the dc source . Trigger commands (and Initate

commands) are referenced either by name or by number. The correspondence between names and
numbers is:

Sequence Number Sequence Name Description

1 (the default) TRANsient Output transient trigger sequence
2 ACQuire Measurement acquire trigger sequence

Initiate commands initialize the trigger system.

ABORt

This command cancels any trigger actions presently in process. Pending trigger levels are reset to their
corresponding immediate values. ABORt also resets the WTG bit in the Operation Condition Status
register (see chapter 3 under Programming the Status Registers). If INITiate:CONTinuous ON has been
programmed, the trigger subsystem initiates itself immediately after ABORt, thereby setting WTG. ABORt
is executed at power turn on and upon execution of *RCL or RST.

Command Syntax

Parameters

Examples

Related Commands

ABORt
None

ABOR

INIT *RST *TRG TRIG

INITiate:SEQuence
INITiate:NAME

INIT:SEQ2 or INIT:NAME ACQ applies to Agilent 66312A, 66332A Only

INITiate commands control the initiation of both output and measurement triggers. When a trigger is
enabled, an event on a selected trigger source causes the specified triggering action to occur. If the trigger
subsystem is not enabled, all trigger commands are ignored.

Command Syntax

Parameters

Examples

Related Commands

INITiate[:IMMediate]:SEQuence[ 1 | 2 ]
INITiate[:IMMediate]:NAME<name>
For INIT:NAME TRANsient | ACQuire
INIT:SEQ2 INIT:NAME TRAN
ABOR INIT:CONT TRIG TRIG:SEQ:DEF *TRG

INITiate:CONTinuous:SEQuence1
INITiate:CONTinuous:NAME

These commands control the output transient trigger system.

1 or ON
0 or OFF

continuously initiates the output trigger system..
turns off continuous triggering. In this state, the output
trigger system must be initiated for each trigger using INITiate:SEQuence.

Command Syntax

Parameters

Examples

Related Commands

INITiate:CONTinuous:SEQuence1<bool>
INITiate:CONTinuous:NAME TRANsient,<bool>
0 | 1 | OFF | ON
INIT:CONT:SEQ ON INIT:CONT:NAME TRAN, 1
ABOR INIT TRIG TRIG:SEQ:DEF *TRG

73

4 - Language Dictionary

TRIGger

When the transient trigger subsystem is initiated, this command generates a trigger signal. The trigger will
then:

1. Initiate a pending level change as specified by CURRent:TRIGger or VOLTage;TRIGger.

2. Clear the WTG bit in the Status Operation Condition register after both transient and acquire trigger

sequences have completed. (WTG is the logical-or of both transient and acquire sequences.)

3. If INITiate:CONTinuous ON has been programmed, the trigger subsystem is immediately re-enabled

for subsequent triggers. As soon as it is cleared, the WTG bit is again set to 1.

Command Syntax

Parameters

Examples

Related Commands

TRIGger[:SEQuence1][:IMMediate]
TRIGger[:TRANsient][:IMMediate]
None

TRIG TRIG:IMM

ABOR CURR:TRIG INIT *TRG VOLT:TRIG

TRIGger:SOURce

This command is included for completeness. It selects the trigger source for transient triggers. Since BUS
is the only trigger source for transient triggers, this command does not need to be used.

BUS

Returned Parameters

GPIB device, *TRG, or <GET> (Group Execute Trigger)

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

TRIGger[:SEQuence1]:SOURce<source>
TRIGger[:TRANsient]:SOURce<source>
BUS
BUS

TRIG:SOUR BUS

TRIGger[:SEQuence1]:SOURce?
TRIGger[:TRANsient]:SOURce?
<CRD>

TRIGger:SEQuence2
TRIGger:ACQuire

Agilent 66312A, 66332A Only

When the trigger subsystem is initiated, these commands generate a measurement trigger signal. The
measurement trigger causes the dc source to measure the output voltage and current and store the
results in a buffer.

.

Command Syntax

Parameters

Examples

Related Commands

74

TRIGger:SEQuence2[:IMMediate]
TRIGger:ACQuire:[:IMMediate]
None

TRIG:SEQ2 TRIG:ACQ

TRIG:SOUR TRIG:SEQ2:DEF TRIG:SEQ2:COUN
TRIG:SEQ2:LEV:VOLT TRIG:SEQ2:SLOP:CURR

Language Dictionary - 4

TRIGger:SEQuence2:COUNt:CURRent
TRIGger:ACQuire:COUNt:CURRent

Agilent 66312A, 66332A Only

This command sets up a successive number of triggers for measuring current data. With this command,
the trigger system needs to be initialized only once at the start of the acquisition period. After each
completed measurement, the instrument waits for the next valid trigger condition to start another
measurement. This continues until the count has completed.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

TRIGger:SEQuence2:COUNt:CURRent<NRf+>
TRIGger:ACQuire:COUNt:CURRent<NRf+>
1 to 100
1
TRIG:SEQ2:COUN:CURR 5 TRIG:ACQ:COUN:CURR 1
TRIGger:SEQuence2:COUNt:CURRent?
TRIGger:ACQuire:COUNt:CURRent?
<NR3>
TRIG:SEQ2 TRIG:ACQ

TRIGger:SEQuence2:COUNt:VOLTage
TRIGger:ACQuire:COUNt:VOLTage

Agilent 66312A, 66332A Only

This command sets up a successive number of triggers for measuring voltage data. With this command,
the trigger system needs to be initialized only once at the start of the acquisition period. After each
completed measurement, the instrument waits for the next valid trigger condition to start another
measurement. This continues until the count has completed.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

TRIGger:SEQuence2:COUNt:VOLTage<NRf+>
TRIGger:ACQuire:COUNt:VOLTage<NRf+>
1 to 100
1

TRIG:SEQ2:COUN:VOLT 5 TRIG:ACQ:COUN:VOLT 1

TRIGger:SEQuence2:COUNt:VOLTage?
TRIGger:ACQuire:COUNt:VOLTage?
<NR3>
TRIG:SEQ2 TRIG:ACQ

75

4 - Language Dictionary

TRIGger:SEQuence2:HYSTeresis:CURRent
TRIGger:ACQuire:HYSTeresis:CURRent

Agilent 66312A, 66332A Only

This command defines a band around the trigger level through which the signal must pass before an
internal measurement can occur. The band limit above and below the trigger level is one half of the
hysteresis value added to or subtracted from the trigger level.

For a positive trigger to occur, the excursion of an output waveform in the positive direction must start
below the lower hysteresis band limit and pass through the upper hysteresis band limit. For a negative
trigger to occur, the excursion of an output waveform in the negative direction must start above the upper
hysteresis band limit and pass through the lower hysteresis band limit.

Command Syntax

Parameters

Unit

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

TRIGger:SEQuence2:HYSTeresis:CURRent<NRf+>
TRIGger:ACQuire:HYSTeresis:CURRent<NRf+>
0 to MAX (see table 4-3)
A (amperes)
0

TRIG:SEQ2:HYST:CURR 0.5 TRIG:ACQ:HYST:CURR 0.5

TRIGger:SEQuence2:HYSTeresis:CURRent?
TRIGger:ACQuire:HYSTeresis:CURRent?
<NR3>
TRIG:SEQ2:HYST:VOLT TRIG:SEQ2:LEV:CURR

TRIGger:SEQuence2:HYSTeresis:VOLTage
TRIGger:ACQuire:HYSTeresis:VOLTage

Agilent 66312A, 66332A Only

This command defines a band around the trigger level through which the signal must pass before an
internal measurement can occur. The band limit above and below the trigger level is one half of the
hysteresis value added to or subtracted from the trigger level.

For a positive trigger to occur, the excursion of an output waveform in the positive direction must start
below the lower hysteresis band limit and pass through the upper hysteresis band limit. For a negative
trigger to occur, the excursion of an output waveform in the negative direction must start above the upper
hysteresis band limit and pass through the lower hysteresis band limit.

76

Command Syntax

Parameters

Unit

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

TRIGger:SEQuence2:HYSTeresis:VOLTage<NRf+>
TRIGger:ACQuire:HYSTeresis:VOLTage<NRf+>
0 to MAX (see table 4-3)
V (volts)
0

TRIG:SEQ2:HYST:VOLT 2 TRIG:ACQ:HYST:VOLT 2

TRIGger:SEQuence2:HYSTeresis:VOLTage?
TRIGger:ACQuire:HYSTeresis:VOLTage?
<NR3>
TRIG:SEQ2:HYST:CURR TRIG:SEQ2:LEV:VOLT

Language Dictionary - 4

TRIGger:SEQuence2:LEVel:CURRent
TRIGger:ACQuire:LEVel:CURRent

Agilent 66312A, 66332A Only

This command sets the trigger level for internally triggered current measurements. A positive current
trigger occurs when the current level changes from a value less than the lower hysteresis band limit to a
value greater than the upper hysteresis band limit. Similarly, a negative current trigger occurs when the
current level changes from a value greater than the upper hysteresis band limit to a value less than the
lower hysteresis band limit.

Command Syntax

Parameters

Unit

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

TRIGger:SEQuence2:LEVel:CURRent<NRf+>
TRIGger:ACQuire:LEVel:CURRent<NRf+>
0 to MAX (see table 4-3)
A (amperes)
0

TRIG:SEQ2:LEV:CURR 5 TRIG:ACQ:LEV:CURR MAX
TRIG:ACQ:LEV 2

TRIGger:SEQuence2:LEVel:CURRent?
TRIGger:ACQuire:LEVel:CURRent?
<NR3>
TRIG:SEQ2:LEV:VOLT TRIG:SEQ2:HYST:CURR

TRIGger:SEQuence2:LEVel:VOLTage
TRIGger:ACQuire:LEVel:VOLTage

Agilent 66312A, 66332A Only

This command sets the trigger level for internally triggered voltage measurements. A positive voltage
trigger occurs when the voltage level changes from a value less than the lower hysteresis band limit to a
value greater than the upper hysteresis band limit. Similarly, a negative voltage trigger occurs when the
voltage level changes from a value greater than the upper hysteresis band limit to a value less than the
lower hysteresis band limit.

Command Syntax

Parameters

Unit

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

TRIGger:SEQuence2:LEVel:VOLTage<NRf+>
TRIGger:ACQuire:LEVel:VOLTage<NRf+>
0 to MAX (see table 4-3)
V (volts)
0

TRIG:SEQ2:LEV:VOLT 5 TRIG:ACQ:LEV:VOLT MAX
TRIG:ACQ:LEV 2

TRIGger:SEQuence2:LEVel:VOLTage?
TRIGger:ACQuire:LEVel:VOLTage?
<NR3>
TRIG:SEQ2:LEV:CURR TRIG:SEQ2:HYST:VOLT

77

4 - Language Dictionary

TRIGger:SEQuence2:SLOPe:CURRent
TRIGger:ACQuire:SLOPe:CURRent

Agilent 66312A, 66332A Only

This command sets the slope of an internally triggered current measurement.

POSitive
NEGative
EITHer

Returned Parameters

Related Commands

triggering occurs on the rising edge.
triggering occurs on the falling edge.
triggering occurs on either edge.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

TRIGger:SEQuence2:SLOPe:CURRent<slope>
TRIGger:ACQuire:SLOPe:CURRent<slope>
EITHer|POSitive|NEGative
EITHer

TRIG:SEQ2:SLOP:CURR POS TRIG:ACQ:SLOP:CURR EITH

TRIGger:SEQuence2:SLOPe:CURRent?
TRIGger:ACQuire:SLOPe:CURRent?
<CRD>
TRIG:SEQ2:SLOP:VOLT

TRIGger:SEQuence2:SLOPe:VOLTage
TRIGger:ACQuire:SLOPe:VOLTage

Agilent 66312A, 66332A Only

This command sets the slope of an internally triggered voltage measurement.

POSitive

triggering occurs on the rising edge.

NEGative
EITHer

78

triggering occurs on the falling edge.
triggering occurs on either edge.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

TRIGger:SEQuence2:SLOPe:VOLTage<slope>
TRIGger:ACQuire:SLOPe:VOLTage<slope>
EITHer|POSitive|NEGative
EITHer

TRIG:SEQ2:SLOP:VOLT POS TRIG:ACQ:SLOP:VOLT EITH

TRIGger:SEQuence2:SLOPe:VOLTage?
TRIGger:ACQuire:SLOPe:VOLTage?
<CRD>
TRIG:SEQ2:SLOP:CURR

TRIGger:SEQuence2:SOURce
TRIGger:ACQuire:SOURce

Agilent 66312A, 66332A Only

These commands select the trigger source for measurement triggers as follows:

Language Dictionary - 4

BUS
INTernal

Returned Parameters

GPIB device, *TRG, or <GET> (Group Execute Trigger)
trigger is generated internally when the measured waveform crosses the trigger level

with the selected slope.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

TRIGger:SEQuence2:SOURce<source>
TRIGger:ACQuire:SOURce<source>
BUS | INTernal
INTernal

TRIG:ACQ:SOUR BUS

TRIGger:SEQuence2:SOURce?
TRIGger:ACQuire:SOURce?
<CRD>

TRIGger:SEQuence1:DEFine
TRIGger:SEQuence2:DEFine

TRIGger:SEQuence2:DEFine applies to Agilent 66312A, 66332A Only

These commands define the names that are aliased to trigger sequences 1 and 2. The command accepts
only ACQuire for sequence 2 and TRANsient for sequence 1 as predefined names. The query allows the
user to query the instrument names aliased to sequences 1 and 2.

Command Syntax

Parameters

Examples

Query Syntax

Returned Parameters

Related Commands

TRIGger:SEQuence1:DEFine TRANsient
TRIGger:SEQuence2:DEFine ACQuire
TRANsient, ACQuire

SEQ1:DEF ACQ SEQ2:DEF TRAN

TRIGger:SEQuence1:DEFine?
TRIGger:SEQuence2:DEFine?
<CRD>
TRIG:SEQ2:ACQ TRIG:SEQ1:TRAN

*TRG

This common command generates a trigger when the trigger subsystem has BUS selected as its source.
The command has the same affect as the Group Execute Trigger (<GET>) command.

In RS-232 mode, this command emmulates some of the functionality of the IEEE-488 Group Execute
Trigger command.

Command Syntax

Parameters

Related Commands

*TRG
None
ABOR INIT TRIG[:IMM] <GET>

79

SCPI Conformance Information

SCPI Version

The Agilent Dynamic Measurement DC Source conforms to SCPI Version 1995.0.

SCPI Confirmed Commands

ABOR SENS:SWE:POIN
CAL:DATA SENS:SWE:TINT
CAL:STAT STAT:OPER[:EVEN]?
DISP[:WIND][:STAT] STAT:OPER:COND?
DISP[:WIND]:TEXT[:DATA] STAT:OPER:ENAB
INIT[:IMM]:SEQ | NAME STAT:OPER:NTR
INIT:CONT:SEQ | NAME STAT:OPER:PTR
MEAS | FETC:ARR:CURR[:DC]? STAT:PRES
MEAS | FETC:ARR:VOLT[:DC]? STAT:QUES[:EVEN]?
MEAS | FETC[:SCAL]:CURR[:DC]? STAT:QUES:COND?
MEAS | FETC[:SCAL]:CURR:HIGH? STAT:QUES:ENAB
MEAS | FETC[:SCAL]:CURR:LOW? STAT:QUES:NTR
MEAS | FETC[:SCAL]:CURR:MAX? STAT:QUES:PTR
MEAS | FETC[:SCAL]:CURR:MIN? SYST:ERR?
MEAS | FETC[:SCAL]:VOLT[:DC]? SYST:LANG
MEAS | FETC[:SCAL]:VOLT:HIGH? SYST:VERS?
MEAS | FETC[:SCAL]:VOLT:LOW? TRIG[:SEQ1 | :TRAN][:IMM]
MEAS | FETC[:SCAL]:VOLT:MAX? TRIG[:SEQ1 | :TRAN]:SOUR
MEAS | FETC[:SCAL]:VOLT:MIN? TRIG:SEQ2 | ACQ[:IMM]
OUTP[:STAT] TRIG:SEQ2 | ACQ:SOUR
OUTP:PROT:CLE TRIG:SEQ:DEF
OUTP:PROT:DEL *CLS
[SOUR]:CURR[:LEV][:IMM][:AMPL] *ESE*ESE?*ESR?
[SOUR]:CURR[:LEV]:TRIG[:AMPL] *IDN?
[SOUR]:CURR:PROT:STAT *OPC*OPC?*OPT?
[SOUR]:VOLT[:LEV][:IMM][:AMPL] *PSC*PSC?
[SOUR]:VOLT[:LEV]:TRIG[:AMPL] *RCL*RST
[SOUR]:VOLT:PROT *SAV*SRE*STB?
SENS:CURR[:DC]:RANG[:UPP] *TRG*TST?
SENS:FUNC *WAI
SENS:SWE:OFFS:POIN

A

Non-SCPI Commands

CAL:CURR[:SOUR][:DC][:POS] OUTP:DFI:SOUR
CAL:CURR[:SOUR][:DC]:NEG OUTP:PON:STAT
CAL:MEAS[:DC]:LOWR OUTP:REL[:STAT]
CAL:MEAS:AC OUTP:REL:POL
CAL:LEV OUTP:RI:MODE
CAL:PASS SENS:CURR:DET
CAL:SAVE [SOUR]:DIG:DATA[:VAL]
CAL:VOLT[:DC] [SOUR]:DIG:FUNC
CAL:VOLT:PROT TRIG:SEQ2 | ACQ:COUN:CURR | :VOLT
DISP[:WIND]:MODE TRIG:SEQ2 | ACQ:HYST:CURR | :VOLT
MEAS | FETC[:SCAL]:CURR:ACDC? TRIG:SEQ2 | ACQ:LEV:CURR | :VOLT
MEAS | FETC[:SCAL]:VOLT:ACDC? TRIG:SEQ2 | ACQ:SLOP:CURR | :VOLT
OUTP:DFI[:STAT]

81

B

Compatibility Language

Introduction

The Agilent power supplies covered by this manual are programmatically compatible with the HP/Agilent
6632A, 6633A, and 6634A dc power supplies. This means that by using COMPatibility language mode you
can program these newer dc sources over the GPIB using COMPatibility commands.

To switch from SCPI commands to COMPatibility commands (and vice versa), use the SYST:LANG
command, as documented in chapter 4. The language setting is saved in non-volatile memory.

Table B-2 summarizes the COMPatibility commands that program the supplies. You may need to refer to
the HP/Agilent Series 6632, 6633A, and 6634A Operating Guide (p/n 5957-6360) for complete information
on the COMPatibility commands.

The rest of this appendix discusses the COMPatibility language status system, and the COMPatibility
language error codes.

Note: For complete information on the Compatibility programming language, order the

HP/Agilent 6632A/6633A/6634A Operating manual, p/n 5957-6360.

Table B-1. COMPatibility Power-on Settings

Command Setting Command Setting

DC 1 (ON) POL 1 (normal)
DLY 8 ms (fast)

80 ms (normal)
DSP 1 (ON) RELAY 1 (close)
ISET 0.04 A (6631B)

0.02 A (6632B)

0.008 A (6633B)

0.004 A (6634B)
OCP OFF SRQ 0
OUT 1 (ON) UNMASK 0
OVSET MAX VSET 0 V

PON last stored value

RLYPON 1 (close)

83

B - Compatibility Language

Table B-2. COMPatibility Commands

Compatibility

Command

ASTS? This command reads the contents of the accumulated status

register, which stores any bit condition entered in the status
register since the accumulated status register was last read,
regardless of whether the condition still exists.
Data Representation: ZZZZD

CLR This command initializes the dc source to the power-on state. It

also resets the PON bit in the serial poll register. The command
performs the same function as the Device Clear (DCL) interface
message.

DC 0 | 1 Only applies to units with Relay Option 760. This command

enables or disables the output without affecting the state of the
output relays.
Initial condition: DC 1

DLY <n> This command programs the delay time between the programming

of an output change that produces a CV, CC, or an UNREG
condition, and the recording of that condition by the status
registers. This can be used to prevent false triggering of the
OverCurrent Protection feature (OCP).
Initial delay: 0.08s (Normal); 0.008s (Fast).

DSP 0 | 1 This command enables or disables the dc source’s front panel

display.
Initial condition: DSP 1

ERR? This command determines the type of programming error detected

by the dc source. A remote programming error sets the ERR bit in
the status register, which can be enabled by UNMASK to request
service.

FAULT? This command reads which bits have been set in the fault register.

A bit is set in the fault register when the corresponding bit in the
status register changes from inactive to active AND the
corresponding bit in the mask register has been enabled. The fault
register is reset only after it has been read. The decimal equivalent
of the total bit weight of all enabled bits is returned.
Data Representation: ZZZZD

ID? This command causes the dc source to report its model number

and any options that affect the dc source’s output.
Data Representation: Agilent663XA

IOUT? This command measures and returns the actual output current.

Data Representation: SD.DDDD

ISET <n> This command programs the output current. See Table 4-3 for the

programming range of this command.
Initial condition: see Table B-1

OCP 0 | 1 This command enables or disables the dc source’s overcurrent

protection. If this function is enabled and the dc source goes into
CC mode, the output of the dc source is disabled. Initial condition:
OCP 0

OUT 0 | 1 This command enables or disables the dc source’s output. The dc

source will be able to implement commands even while the output
is disabled. Initial condition: OUT 1

Description Similar SCPI

Command

STAT:OPER?
STAT:QUES?
*ESE?

*RST

OUTP:STAT[:NOR]
0 | 1 | OFF | ON

OUTP:PROT:DEL

DISP 0|1|OFF|ON

SYST:ERR?

STAT:OPER?
STAT:QUES?
*ESE

*IDN?

MEAS:CURR?
CURR

CURR:PROT:STAT
0 | 1 | OFF | ON

OUTP:STAT
0 | 1 | OFF | ON

84

Compatibility Language - B

Table B-2. COMPatibility Commands (continued)

Compatibility

Command

OVSET <n> This command programs the overvoltage protection. See Table

4-3 for the programming range of this command.
Initial condition: MAX

POL 0 | 1 Only applies to units with Option 760. This command sets the

polarity of the output relays to either normal (1) or inverted (0).
Initial condition: POL 1

PON 0 | 1 This command enables (1) or disables (0) SRQ at power-on.

Initial condition: last programmed value

RELAY 0 | 1 Only applies to units with Relay Option 760. This command opens

(0) or closes (1) the output relays without affecting the
programmed output state of the unit.
Initial condition: RELAY 1

RLYPON 0 | 1 Only applies to units with Relay Option 760. This command opens

(0) or closes (1) the output relays at power-on without affecting
the programmed output state of the unit.
Initial condition: RLYPON 1

ROM? This command returns the ROM version of the dc source.

Data Representation: AAA AAA

RST This command resets the dc source if the output is disabled by

the output protection circuits.
SENS:CURR
:RANG <n>

SENS:SWE
:POIN <n>

SENS:SWE
:TINT <n>

SRQ 0 | 1 These commands enable or disable the dc source's ability to

STS? This command reads the contents of the status register, which

SYST:LANG This command causes the alternate language to become active

TEST? This command causes the dc source to run selftest and report

This command sets the current measurement range of the dc

source. See Table 4-3 for the programming range of this

command.

Initial condition: MAX

This command defines the number of data points in a

measurement sweep.

Initial condition: 32

This command defines the time period between measurement

samples.

Initial condition: 15.6 µs.

request service from the controller for fault conditions. UNMASK

defines which conditions are defined as faults.

Initial condition: SRQ 0

maintains the present status of the dc source.

Data Representation: ZZZZD

and to be stored in nonvolatile memory. In this case, the

commands are equivalent. After being shut off, the dc source will

resume in the last-selected language when power is restored.

The parameter must be either COMP or SCPI.

any detected failures.

Data Representation: ZZZZD

Description Similar SCPI

Command

VOLT:PROT

OUTP:REL:POL 0|1

PSC 0 | 1
OUTP:REL 0 | 1

RCL 0

*IDN?
OUTP:PROT:CLE
SENS:CURR:RANG

SENS:SWE:POIN

SENS:SWE:TINT

*SRE

STAT:OPER:COND?
STAT:QUES:COND?
*ESE?
SYST:LANG

*TST?

85

B - Compatibility Language

Table B-2. COMPatibility Commands (continued)

Compatibility

Command

UNMASK
xxx

VOUT? This command measures and returns the actual output voltage.
VSET <n> This command programs the output voltage. See Table 4-3 for the

A = Alpha
D = Digit

S = Sign (blank for positive and – for negative)
Z = Digit with leading zeros output as spaces

Error NumberError String [Description/Explanation/Examples]

ERR 0 No error
ERR 1 EEPROM save failed [Data write to non-volatile memory failed]
ERR 2 Second PON after power-on [More than one PON command received after power-on. Only one

ERR 4 RLYPON sent with no relay option present [A RLYPON command was sent with no relay option
ERR 5 No relay option present [A relay option command was sent with no relay option present.]

ERR 8 Addressed to talk and nothing to say [The unit was addressed to talk without first receiving a

ERR 10 Header expected [A non-alpha character was received when a header was expected.]
ERR 11 Unrecognized header [The string of alpha characters received was not a valid command.]
ERR 20 Number expected [A non-numeric character was received when a number was expected.]
ERR 21 Number Syntax [The numeric character received did not represent a proper number.]
ERR 22 Number out of internal range [The number received was too large or small to be represented in

ERR 30 Comma [A comma was not received where one was expected.]
ERR 31 Terminator expected [A valid terminator was not received where one was expected.]
ERR 41 Parameter Out [The number received exceeded the limits for its associated command.]
ERR 42 Voltage Programming Error [The programmed value exceeded the valid voltage limits.]
ERR 43 Current Programming Error [The programmed value exceeded the valid current limits.]
ERR 44 Overvoltage Programming Error [The programmed value exceeded the valid overvoltage limits.]
ERR 45 Delay Programming Error [The programmed value exceeded the valid delay limits.]
ERR 46 Mask Programming Error [The programmed value exceeded the fault mask limits.]
ERR 51 EEPROM Checksum [EEPROM failed, or a new uncalibrated EEPROM was installed.]

These commands determine the conditions that will set bits in the

fault register, allowing the operator to define the conditions that will

be reported as fault Fault conditions can be enabled by sending

the decimal equivalent of the total bit weight of all conditions to be

enabled.

Data Representation: SZZD.DD; (SZD.DDD for 6634B only)

programming range of this command.

Initial condition: 0 V

Table B-3. COMPatibility Errors

is allowed.]
present.]

query.]

internal format.]

Description Similar SCPI

Command

STAT:OPER:ENAB
STAT:QUES:ENAB
*ESE

MEAS:VOLT?
VOLT

86

CV

MASKUS

REGISTER

Q

+CC
UNR

OV
OT

not used

OC

ERR

INH

-CC

FAST

NORM

STATUS

REGISTER

1
2
4
8

16
32

64
128
256
512

1024
2048

ACCUMULATED

STATUS

REGISTER

1
2
4
8

16
32

64

128
256

512
1024
2048

CV
+CC
UNR

OV

OT

not used

OC

ERR

INH

-CC

FAST

NORM

1024
2048

Compatibility Language - B

FAULT

REGISTER

1
2
4
8

16
32

64

1024
2048

128
256
512

not used

not used

not used

1
2
4
8

16
32

64
128
256
512

FAU

PON

RDY
ERR
R

S

SERIAL

POLL

REGISTER

1
2
4
8

16

32

64

128

Figure B-1. COMpatibility Status Model

Table B-4. Bit Assignment of Status, Astatus, Fault, & Mask Registers

Bit Position 11 10 9876543210
Bit Name NORM FAST -CC INH ERR OC not

OT OV UNR +CC CV

used
Bit Weight 2048 1024 512 256 128 64 32 16 8421
CV = The unit is operating in constant voltage mode.
CC+ = The unit is operating in constant current mode.
UNR = The output of the unit is unregulated.
OV = The overvoltage protection circuit has tripped.
OT = The over-temperature protection circuit has tripped.
OC = The overcurrent protection circuit has tripped.
ERR = A programming error has occurred. Use ERR? to clear.
CC = The unit is operating in negative constant current mode.
INH = The external remote inhibit signal has turned the output off.
FAST = The output is in Fast operating mode. (Agilent 66332A, 6631B, 6632B, 6633B, 6634B only)
NORM = The output is in Normal operating mode. (Agilent 66332A, 6631B, 6632B, 6633B, 6634B only)

Table B-5. Bit Configuration of Serial Poll Register

Bit Position 76543210
Bit Name not used RQS ERR RDY not used not used PON FAU
Bit Weight 64 32 16 2 1
RQS = The dc source has generated a service request. Use a serial poll to clear.
ERR = Same as ERR bit in Status register. Use ERR? to clear.
RDY = This bit cleared when unit busy processing commands. Set when processing complete.
PON = A Power-on has occurred. Use CLR to clear.
FAU = A bit has been set in the Fault register. Use FAULT? to clear.

87

C

Error Messages

Error Number List

This appendix gives the error numbers and descriptions that are returned by the dc source. Error
numbers are returned in two ways:

♦

Error numbers are displayed on the front panel

♦

Error numbers and messages are read back with the SYSTem:ERRor? query. SYSTem:ERRor?
returns the error number into a variable and returns two parameters: an NR1 and a string.

The following table lists the errors that are associated with SCPI syntax errors and interface problems. It
also lists the device dependent errors. Information inside the brackets is not part of the standard error
message, but is included for clarification.

When errors occur, the Standard Event Status register records them as follows:

Bit Set Error Code Error Type Bit Set Error Code Error Type

5 -100 thru -199 Command 3 -300 thru -399 or

1 thru 32767

4 200 thru -299 Execution 2 -400 thru -499 Query

Device-dependent

Table C-1. Error Numbers

Error

Number

–100 Command error [generic]
–101 Invalid character
–102 Syntax error [unrecognized command or data type]
–103 Invalid separator
–104 Data type error [e.g., "numeric or string expected, got block data"]
–105 GET not allowed
–108 Parameter not allowed [too many parameters]
–109 Missing parameter [too few parameters]
–112 Program mnemonic too long [maximum 12 characters]
–113 Undefined header [operation not allowed for this device]
–121 Invalid character in number [includes "9" in octal data, etc.]
–123 Numeric overflow [exponent too large; exponent magnitude >32 k]
–124 Too many digits [number too long; more than 255 digits received]
–128 Numeric data not allowed
–131 Invalid suffix [unrecognized units, or units not appropriate]
–138 Suffix not allowed

Error String [Description/Explanation/Examples]

89

C - Error Messages

Table C-1. Error Numbers (continued)

Error

Number

–141 Invalid character data [bad character, or unrecognized]

–144 Character data too long
–148 Character data not allowed
–150 String data error
–151 Invalid string data [e.g., END received before close quote]
–158 String data not allowed
–160 Block data error
–161 Invalid block data [e.g., END received before length satisfied]
–168 Block data not allowed
–170 Expression error
–171 Invalid expression
–178 Expression data not allowed
–200 Execution error [generic]
–222 Data out of range [e.g., too large for this device]
–223 Too much data [out of memory; block, string, or expression too long]
–224 Illegal parameter value [device-specific]
–225 Out of memory
–270 Macro error
–272 Macro execution error
–273 Illegal macro label
–276 Macro recursion error
–277 Macro redefinition not allowed
–310 System error
–350 Too many errors [errors beyond 9 lost due to queue overflow]
–400 Query error [generic]
–410 Query INTERRUPTED [query followed by DAB or GET before response complete]
–420 Query UNTERMINATED [addressed to talk, incomplete programming message received]
–430 Query DEADLOCKED [too many queries in command string]
–440 Query UNTERMINATED [after indefinite response]

0 No error
1 Non-volatile RAM RD0 section checksum failed
2 Non-volatile RAM CONFIG section checksum failed
3 Non-volatile RAM CAL section checksum failed
4 Non-volatile RAM STATE section checksum failed

5 Non-volatile RST section checksum failed
10 RAM selftest
11 VDAC/IDAC selftest 1
12 VDAC/IDAC selftest 2
13 VDAC/IDAC selftest 3
14 VDAC/IDAC selftest 4
15 OVDAC selftest
80 Digital I/O selftest error

Error String [Description/Explanation/Examples]

90

Table C-1. Error Numbers (continued)

Error

Number

213 Ingrd receiver buffer overrun
216 RS-232 receiver framing error
217 RS-232 receiver parity error
218 RS-232 receiver overrun error
220 Front panel uart overrun
221 Front panel uart framing
222 Front panel uart parity
223 Front panel buffer overrun
224 Front panel timeout
401 CAL switch prevents calibration
402 CAL password is incorrect
403 CAL not enabled
404 Computed readback cal constants are incorrect
405 Computed programming cal constants are incorrect
406 Incorrect sequence of calibration commands
407 CV or CC status is incorrect for this command
408 Output mode switch must be in NORMAL position
601 Too many sweep points
602 Command only applies to RS-232 interface
603 CURRent or VOLTage fetch incompatible with last acquisition
604 Measurement overrange

Error String [Description/Explanation/Examples]

Error Messages - C

91

D

Example Programs

Introduction

The example programs in this section are intended to show how some of the same dc source
functions can be programmed to each of the following GPIB interfaces:

1. HP Vectra PC controller with Agilent 82335A GPIB Interface Command Library

2. IBM PC controller with National Instuments GPIB-PCII Interface/Handler

3. Agilent controller with BASIC Language System

Assigning the GPIB Address in Programs

The dc source address cannot be set remotely. It must be set using the front panel Address key.
Once the address is set, you can assign it inside programs. The following examples assume that
the GPIB select code is 7, and the dc source is assigned to the variable PS.

1070 PS=706 !Agilent 82335A Interface
1070 ASSIGN @PS TO 706 !BASIC Interface

For systems using the National Instruments DOS driver, the address is specified in the software
configuration program (IBCONFIG.EXE) and assigned a symbolic name. The address then is
referenced only by this name within the application program (see the National Instruments GPIB
documentation).

Types of DOS Drivers

The Agilent 82335A and National Instruments GPIB are two popular DOS drivers. Each is briefly
described here. See the software documention supplied with the driver for more details.

Agilent 82335A Driver

For GW-BASIC programming, the GPIB library is implemented as a series of subroutine calls. To
access these subroutines, your application program must include the header file SETUP.BAS,
which is part of the DOS driver software.

SETUP.BAS starts at program line 5 and can run up to line 999. Your application programs must
begin at line 1000. SETUP.BAS has built-in error checking routines that provide a method to
check for GPIB errors during program execution. You can use the error-trapping code in these
routines or write your own code using the same variables as used by SETUP.BAS.

National Instruments GPIB Driver

Your program must include the National Instruments header file DECL.BAS. This contains the
initialization code for the interface. Prior to running any applications programs, you must set up the
interface with the configuration program (IBCONF.EXE).

93

D - Example Programs
Your application program will not include the dc source’s symbolic name and GPIB address.

These must be specified during configuration (when you run IBCONF.EXE). Note that the primary
address range is from 0 to 30 but any secondary address must be specified in the address range
of 96 to 126. The dc source expects a message termination on EOI or line feed, so set EOI w/last
byte of Write. It is also recommended that you set Disable Auto Serial Polling.

All function calls return the status word IBSTA%, which contains a bit (ERR) that is set if the call
results in an error. When ERR is set, an appropriate code is placed in variable IBERR%. Be sure
to check IBSTA% after every function call. If it is not equal to zero, branch to an error handler that
reads IBERR% to extract the specific error.

Error Handling

If there is no error-handling code in your program, undetected errors can cause unpredictable
results. This includes "hanging up" the controller and forcing you to reset the system. Both of the
above DOS drivers have routines for detecting program execution errors. Error detection should
be used after every call to a subroutine.

BASIC Controllers

The BASIC Programming Language provides access to GPIB functions at the operating system
level. This makes it unnecessary to have the header files required in front of DOS applications
programs. Also, you do not have to be concerned about controller "hangups" as long as your
program includes a timeout statement. Because the dc source can be programmed to generate
SRQ on errors, your program can use an SRQ service routine for decoding detected errors. The
detectable errors are listed in Appendix C.

Example 1. HP Vectra PC Controller Using Agilent 82335 Interface

5 ’-------------------- Merge SETUP.BAS here -------------------­1000 MAX.ELEMENTS=2 :ACTUAL.ELEMENTS=0 :MAX.LENGTH=80 :ACT.LENGTH=0
1005 DIM OUTPUTS(2) :CODES$=SPACE$(40)
1010 ISC=7 :PS=706
1015 ’
1020 ’Set up the DC Source Interface for DOS driver
1025 CALL IORESET (ISC) ’Reset the interface
1030 IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
1035 TIMEOUT=3
1040 CALL IOTIMEOUT (ISC, TIMEOUT) ’Set timeout to 3 seconds
1045 IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
1050 CALL IOCLEAR (ISC) ’Clear the interface
1055 IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
1060 CALL IOREMOTE (ISC) ’Set dc source to remote
mode
1065 IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
1070 ’
1075 ’Program dc source to CV mode with following voltage and current
1080 CODES$ = "VOLTAGE MAX;CURRENT MAX" :GOSUB 2000

94

Example Programs - D

1085 ’
1090 ’Query dc source outputs CURRENT?" :GOSUB 2000 :GOSUB 3000
1100 VOUT = OUTPUTS(1)
1105 IOUT = OUTPUTS(2)
1110 PRINT "The output levels are "VOUT" Volts and "IOUT" Amps"
1115 ’
1120 ’Program triggered current level to value insufficient to maintain
1125 ’supply within its CV operating characteristic
1130 CODES$ = "CURR:TRIG MIN" :GOSUB 2000
1135 ’
1140 ’Set operation status mask to detect mode change from CV to CC
1145 CODES$ = "STAT:OPER:ENAB 1024;PTR 1024" :GOSUB 2000
1150 ’
1155 ’Enable Status Byte OPER summary bit
1160 CODES$ = "*SRE 128" :GOSUB 2000
1165 ’
1170 ’Arm trigger circuit and send trigger to dc source
1175 CODES$ = "INITIATE:SEQUENCE1;TRIGGER" :GOSUB 2000
1180 ’
1185 ’Wait for supply to respond to trigger
1190 FOR I= 1 to 100 :NEXT I
1195 ’
1200 ’Poll for interrupt caused by change to CC mode and print to
screen
1205 CALL IOSPOLL (PS,RESPONSE)
1210 IF (RESPONSE AND 128) <> 128 THEN GOTO 1240 ’No OPER event to
report
1215 CODES$ = "STATUS:OPER:EVEN?" :GOSUB 2000 ’Query status oper
register
1220 CALL IOENTER (PS,OEVENT) ’Read back event bit
1225 IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
1230 IF (OEVENT AND 1024) = 1024 THEN PRINT "Supply switched to CC
mode."
1240 ’Clear the status circuit
1245 CODES$ = "*CLS" :GOSUB 2000
1250 FOR I = 1 TO 100 :NEXT I ’Wait for supply to
clear
1255 ’
1260 ’Disable output and save present state in location 2
1265 CODES$ = "OUTPUT OFF;*SAV 2" :GOSUB 2000
1270 END
1275 ’
2000 ’Send command to dc source
2005 LENGTH = LEN(CODES$)
2010 CALL IOOUTPUTS (PS,CODES$,LENGTH) ’Send command to
interface
2015 IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR ’SETUP.BAS error
trap
2020 RETURN
2025 ’
3000 ’Get data from dc source
3005 CALL IOENTERA (PS,OUTPUTS(1),MAX.ELEMENTS,ACTUAL.ELEMENTS)
3010 IF PCIB.ERR <> NOERR THEN ERROR PCIB.BASERR
3015 RETURN

95

D - Example Programs

Example 2. IBM Controller Using National Interface

990 ’---------------------- Merge DECL.BAS here -----------------------­1000 ’DC Source Variable = PS% ; Stand-Alone Address = 706
1005 CODES$=SPACE$(50):MODE$=SPACE$(5):OEVENT$=SPACE$(20)
1010 D$=SPACE$(60):OUTPUT$=SPACE$(40):BDNAME$="PS%"
1015 DIM OUTPUT(2)
1020 ’
1025 ’Set up dc source interface for DOS driver
1030 CALL IBFIND(BDNAME$,PS%)
1035 IF PS%
1040 CALL IBCLR(PS%)
1045 ’
1050 ’Program dc source to CV mode with following voltage and current
1055 CODES$ = "VOLTAGE MAX;CURRENT MAX" :GOSUB 2000
1060 ’
1065 ’Query dc source outputs and print to screen
1070 CODES$ = "MEASURE:VOLTAGE?;CURRENT?" :GOSUB 2000 :GOSUB 3000
1075 VOUT = OUTPUT(1)
1080 IOUT = OUTPUT(2)
1085 PRINT"The programmed levels are "VOUT" Volts and "IOUT" Amps"
1090 ’
1095 ’Program triggered current level to value insufficient to maintain
1100 ’supply within its CV operating characteristic
1105 CODES$ = "CURR:TRIG MIN" :GOSUB 2000
1110 ’
1115 ’Set operation status mask to detect mode change from CV to CC
1120 CODES$ = "STAT:OPER:ENAB 1024;PTR 1024" :GOSUB 2000
1125 ’
1130 ’Enable Status Byte OPER summary bit
1135 CODES$ = "*SRE 128" :GOSUB 2000
1140 ’
1145 ’Arm trigger circuit and send trigger to dc source
1150 CODES$ = "INITIATE:SEQUENCE1;TRIGGER" :GOSUB 2000
1160 ’Wait for supply to respond to trigger
1165 FOR I= 1 to 100 :NEXT I
1170 ’
1175 ’Poll for interrupt caused by change to CC mode and print to screen
1180 SPOL%=0
1185 CALL IBRSP(PS%,SPOL%)
1190 IF (SPOL% AND 128) = 128 THEN POLL = 1 ’Set interrupt flag on
OPER bit
1195 IF POLL <> 1 THEN GOTO 1230 ’No interrupt to
service
1200 "CODES$ = "STAT:OPER:EVEN?" :GOSUB 2000 ’Query status oper
register
1205 CALL IBRD(PS%,OEVENT$) ’Read back event bit
1210 IF IBSTA%
1215 OEVENT=VAL(OEVENT$)
1220 IF (OEVENT AND 1024) = 1024 THEN PRINT "Supply switched to CC mode."

96

Example Programs - D

1225 ’
1230 ’Clear status circuit
1235 CODES$="*CLS" :GOSUB 2000
1240 FOR I=1 TO 50 :NEXT I ’Wait for supply to clear
1245 ’
1250 ’Disable output and save present state to location 2
1255 CODES$ = "OUTPUT OFF;*SAV 2" :GOSUB 2000
1260 END
1265 ’
2000 ’Send command to dc source
2005 CALL IBWRT(PS%,CODES$)
2010 IF IBSTAT%
2015 RETURN
1250 ’Disable output and save present state to location 2
1255 CODES$ = "OUTPUT OFF;*SAV 2" :GOSUB 2000
1260 END
1265 ’
2000 ’Send command to dc source
2005 CALL IBWRT(PS%,CODES$)
2010 IF IBSTAT%
2015 RETURN
2020 ’
2100 ’Error detection routine
2105 PRINT "GPIB error. IBSTAT% = HEX$(IBSTAT%)
2110 PRINT " IBERR% = ";IBERR%" in line ";ERL
2115 STOP
2120 ’
3000 ’Get data from dc source
3005 CALL IBRD(PS%,OUTPUT$)
3010 IF IBSTA%
3015 I=1 ’Parse data string
3020 X=1
3025 C=INSTR(I,OUTPUT$,";")
3030 WHILE C <> 0
3035 D$=MID$(OUTPUT$,I,C-I)
3040 OUTPUT(X)=VAL(D$) ’Get values
3045 I=C+1
3050 C=INSTR(I,OUTPUT$,";")
3055 X=X+1
3060 WEND
3065 D$=RIGHT$(OUTPUT$,LEN(OUTPUT$)-(I-1))
3070 OUTPUT(X)=VAL(D$)
3075 OUTPUT$=SPACE$(40) ’Clear string
3080 RETURN

97

D - Example Programs

Example 3. Controller Using BASIC

1000 !Dc source at stand-alone address = 706
1005 OPTION BASE 1
1010 DIM Codes$[80],Response$[80],Mode$[32]
1015 !
1020 !Program dc source to CV mode with following voltage and current
1025 OUTPUT 706;"VOLTAGE MAX;CURRENT MAX"
1030 !
1035 !Query dc source outputs and print to screen
1040 OUTPUT 706;"MEASURE:VOLTAGE?;CURRENT?" !Query output
levels
1045 ENTER 706;Vout,Iout
1050 PRINT "The output levels are ";Vout;" Volts and ";Iout" Amps"
1055 !
1060 !Program current triggered level to a value insufficient to
maintain
1065 !supply within its CV operating characteristic
1070 OUTPUT 706;"CURR:TRIG MIN"
1075 !
1080 !Set operation status mask to detect mode change from CV to CC
1085 OUTPUT 706;"STAT:OPER:ENAB 1024;PTR 1024"
1090 !
1095 !Enable Status Byte OPER summary bit
1100 OUTPUT 706;"*SRE 128"
1105 !
1110 !Arm trigger circuit and send trigger to dc source
1115 OUTPUT 706;"INITIATE:SEQUENCE1;TRIGGER"
1130 !Poll for interrupt caused by change to CC mode and print to
screen
1135 Response=SPOLL(706)
1140 IF NOT BIT (Response,7) THEN GOTO 1130 !No OPER event to
report
1145 OUTPUT 706;"STAT:OPER:EVEN?" !Query status operation
register
1150 ENTER 706;Oevent !Read back event
bit
1155 IF BIT(Oevent,10) THEN PRINT "Supply switched to CC mode."
1160 !
1165 !Clear status
1170 OUTPUT 706;"*CLS"
1175 !
1180 !Disable output and save present state in location 2
1185 OUTPUT 706;"OUTPUT OFF;*SAV 2"
1190 END

98

INDEX

—A—

AARD, 16
ABORT, 73
ACDC, 52

—B—

bus, 79

—C—

calibration commands, 44

CAL CURR, 44
CAL CURR MEAS AC, 44
CAL CURR NEG, 44
CAL DATA, 45
CAL LEV, 45
CAL PASS, 45
CAL SAVE, 45
CAL STAT, 46
CAL VOLT, 46
CAL VOLT PROT, 46

calibration commands:CAL CURR MEAS LOWR ",

44
character strings, 16
combine commands

common commands, 14

from different subsystems, 14

root specifier, 14
command completion, 17
common command syntax, 43
common commands, 61, 68

*CLS, 64

*ESE, 65

*ESR?, 65

*IDN?, 70

*OPC, 65

*OPT?, 71

*PSC, 66

*RCL, 71

*RST, 71

*SAV, 72

*SRE, 66

*STB?, 67

*TRG, 79

*TST, 72

*WAI, 67
compatibility

commands, 84

errors, 86

language, 83

power-on settings, 83

status model, 87
conventions used in this guide, 12
CRD, 16
current, 20

maximum, 20
measurement range, 24

measurements, 23
current measurement detector, 28, 52
current measurement range, 52

—D—

DC, 52
dc measurements, 23
determining cause of interrupt, 35
device clear, 17
DFI, 36
DFI programming example, 37
digital I/O port, 37
discrete fault indicator, 36
display commands, 68

DISP, 68

DISP MODE, 68

DISP TEXT, 68
DOS driver types, 93
DTR-DSR, 11

—E—

either, 78
enabling the output, 19
error handling, 94
error numbers, 89
example

controller using HP BASIC, 98

DFI programming, 37

HP Vectra with HP 82335 interface, 94

IBM controller using National interface, 96

programs, 93

pulse measurement, 11, 30

—F—

fault indicator

discrete, 36

remote inhibit, 36
fetch commands, 23, 47
FLT, 36

—G—

general information, 7
generating measurement triggers, 26
generating triggers, 22
GP-IB

command library for MS DOS, 8

controller programming, 8

IEEE Std for standard codes, 8

IEEE Std for standard digital interface, 8

references, 8

99

Index

—H—

hanning, 54
header, 15

long form, 15

short form, 15
history, 2
HP 8235A driver, 93
HP BASIC controllers, 94
HP-IB

address, 10

capabilities of the dc source, 10

triggers, 26

—I—

INH, 36
initialization, 19
initiate commands, 73

INIT CONT NAME, 73

INIT CONT SEQ, 73

INIT NAME, 73

INIT SEQ, 73
initiating measurement trigger system, 25
initiating output trigger system, 22
internal, 79
internal triggers, 26
internally triggered measurements, 25

—L—

language, 83
language dictionary, 39
latching, 57
live, 57

—M—

making measurements, 23
MAV bit, 35
maximum measurements, 24
measure commands, 23, 47

MEAS ARRay CURR?, 47

MEAS ARRay VOLT?, 47

MEAS CURR ACDC?, 48

MEAS CURR HIGH?, 48

MEAS CURR LOW?, 49

MEAS CURR MAX?, 49

MEAS CURR MIN?, 49

MEAS CURR?, 48

MEAS VOLT ACDC?, 50

MEAS VOLT HIGH?, 50

MEAS VOLT LOW?, 51

MEAS VOLT MAX?, 51

MEAS VOLT MIN?, 51

MEAS VOLT?, 50
measurement trigger system model, 25
measuring output pulses, 28
message terminator, 15

end or identify, 15

newline, 15

message unit

separator, 15
minimum measurements, 24
monitoring both phases of status transition, 36
moving among subsystems, 14
MSS bit, 35
multiple measurements, 29

—N—

National Instruments GPIB driver, 93
negative, 78
numerical data formats, 16

—O—

OCP, 20
operation status group, 33
optional header

example, 14
output commands, 55

OUTP, 55

OUTP DFI, 55

OUTP DFI SOUR, 55

OUTP PON STAT, 56

OUTP PROT CLE, 56

OUTP PROT DEL, 56

OUTP REL, 57

OUTP REL POL, 57

OUTP RI MODE, 57
output queue, 35
output trigger system model, 21
overcurrent protection, 20

—P—

PON (power on) bit, 34
positive, 78
post-event triggering, 30
power-on conditions, 32
power-on initialization, 19
pre-event triggering, 30
print date, 2
program examples, 93
programming parameters, 43
programming status registers, 32
programming the output, 19
pulse measurement example, 11, 30
pulse measurement queries, 28
pulse waveforms, 28

—Q—

queries, 14
query

indicator, 15
questionable status group, 34

100