Agilent Technologies 66321b, 66319b, 66319D User Manual

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USER’S GUIDE

Agilent Technologies

Model 66319B/D, 66321B/D

Mobile Communications DC Source

Featuring programmable output resistance

(Refer to page 20 f or a br ief description of the model differences.)

Agilent Part No. 5964-8184

Microfiche No. 5964-8185

Printed in Malaysia: May, 2003

Warranty Information

CERTIFICATION

Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory. Agilent Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other International Standards Organization members.

WARRANTY

This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period of three years from date of delivery. Agilent Technologies software and firmware products, which are designated by Agilent Technologies for use with a hardware product and when properly installed on that hardware product, are warranted not to fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery. During the warranty period Agilent Technologies will, at its option, either repair or replace products which prove to be defective. Agilent does not warrant that the operation for the software firmware, or hardware shall be uninterrupted or error free.

For warranty service, with the exception of warranty options, this product must be returned to a service facility designated by Agilent Technologies. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned to Agilent Technologies for warranty service. Except for products returned to Customer from another country, Agilent Technologies shall pay for return of products to Customer.

Warranty services outside the country of initial purchase are included in Agilent Technologies' product price, only if Customer pays Agilent Technologies international prices (defined as destination local currency price, or U.S. or Geneva Export price).

If Agilent is unable, within a reasonable time to repair or replace any product to condition as warranted, the Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer, Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper site preparation and maintenance. NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES. AGILENT SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

ASSISTANCE

The above statements apply only to the standard product warranty. Warranty options, extended support contacts, product maintenance agreements and customer assistance agreements are also available. Contact your nearest Agilent Technologies Sales and Service office for further information on Agilent Technologies' full line of Support Programs.

Safety Summary

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

GENERAL

This product is a Safety Class 1 instrument (provided with a protective earth terminal). The protective features of this product may be impaired if it is used in a manner not specified in the operation instructions. Any LEDs used in this product are Class 1 LEDs as per IEC 825-1.

This ISM device complies with Canadian ICES-001. Cet appareil ISM est conforme à la norme NMB-001 du Canada.

ENVIRONMENTAL CONDITIONS

This instrument is intended for indoor use in an installation category II, pollution degree 2 environment. It is designed to operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to the specifications tables for the ac mains voltage requirements and ambient operating temperature range.

BEFORE APPLYING POWER

Verify that the product is set to match the available line voltage, the correct fuse is installed, and all safety precautions are taken. Note the instrument's external markings described under "Safety Symbols".

GROUND THE INSTRUMENT

To minimize shock hazard, the instrument chassis and cover must be connected to an electrical ground. The instrument must be connect ed to the ac power mains t hrough a grounded power cable, with the ground wire firmly connected to an electrical ground (safety ground) at the power outlet. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will cause a potential shock hazard that could result in personal injury.

ATTENTION: Un circuit de terre continu est essentiel en vue du fonctionnement sécuritaire de l'appareil. Ne jamais mettre l'appareil en marche lorsque le conducteur de mise … la terre est d‚branch‚.

FUSES

Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be used. Do not use repaired fuses or short-circuited fuseholders. To do so could cause a shock or fire hazard.

Vous devrez impérativement utiliser des fusibles calibrés aux spécifications de courant, tension et type (coupure, délai de coupure, etc ...). N'utilisez jamais de fusibles réparés et ne court-circuitez pas les supports de fusibles. Sinon, vous risquez de provoquer un choc électrique ou un incendie.

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE

Do not operate the instrument in the presence of flammable gases or fumes.

DO NOT REMOVE THE INSTRUMENT COVER

Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made only by qualified service personnel.

Instruments that appear damaged or defective should be made inoperative and secured against unintended operation until they can be repaired by qualified service personnel.

SAFETY SYMBOLS

Direct current

Alternating current

Both direct and alternating current

Three-phase alternating current

Earth (ground) terminal

Protective earth (ground) terminal

Frame or chassis terminal

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

Terminal for Neutral conductor on permanently installed equipment

Terminal for Line conductor on permanently installed equipment

On (supply)

Off (supply)

Standby (supply). Units with this symbol are not completely disconnected from ac mains when this switch is off. To completely disconnect the unit from ac mains, either disconnect the power cord or have a qualified electrician install an external switch.

WARNING

Caution

In position of a bi-stable push control

Out position of a bi-stable push control

Caution, risk of electric shock

Caution, hot surface

Caution (refer to accompanying documents)

The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met.

The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met.

Declaration Page

DECLARATION OF CONFORMITY

according to ISO/IEC Guide 22 and EN 45014

Manufacturer's Name: Agilent Techno logies, Inc.

Manufacturer's Address: 140 Green Pond Road Rockaway, New Jersey 07866 U.S.A.

declares that the Product Product Name: a) Dynamic Measurement DC Source

b) System DC Power Supply

c) Remote Front Panel Model Number: a) Agilent 66311B, 66311D, 66312A, 66111A, 66321B, 66321D

b) Agilent 6612B, 6611C, 6612C, 6613C, 6614C

c) Agilent 14575A

conforms to the following Product Specifications: Safety: IEC 1010-1:1990+A1(1992)/EN61010-1:1993 EMC: CISPR 11:1990 / EN 55011:1991 - Group 1 Class B

IEC 801-2:1991 / EN 50082-1:1992 - 4 kV CD, 8 kV AD IEC 801-3:1984 / EN 50082-1:1992 - 3 V / m IEC 801-4:1988 / EN 50082-1:1992 - 0.5 kV Signal Lines 1 kV Power Lines

Supplementary Information:

The pro duct herewith complies with the requirements of the Low Voltage Directive 73/23/EEC//93/68/EEC and the EMC Directive 89/336/EEC and carries the CE-marking accordingly.

New Jersey May 1, 2000 ______ Location Date Bruce Krueger / Quality Manager

European Contact: Your local Agilent Technologies Sales and Service Office or Agilent Technologies GmbH,

Department TRE, Herrenberger Strasse 130, D-71034 Boeblingen (FAX:+49-7031-14-3143)

DECLARATION OF CONFORMITY

according to ISO/IEC Guide 22 and EN 45014

Manufacturer's Name: Agilent Techno logies, Inc.

Manufacturer's Address: 140 Green Pond Road Rockaway, New Jersey 07866 U.S.A.

declares that the Product Product Name: a) Mobile Communication DC Source-Dual Output Model Number: a) Agilent 66319B, 66319D

conforms to the following Product Specifications: Safety: IEC 1010-1:1990+A1(1992)/EN61010-1:1993 EMC: CISPR 11:1990 / EN 55011:1991 - Group 1 Class B

IEC 801-2:1991 / EN 50082-1:1992 - 4 kV CD, 8 kV AD IEC 801-3:1984 / EN 50082-1:1992 - 3 V / m IEC 801-4:1988 / EN 50082-1:1992 - 0.5 kV Signal Lines 1 kV Power Lines

Supplementary Information:

The pro duct herewith complies with the requirements of the Low Voltage Directive 73/23/EEC//93/68/EEC and the EMC Directive 89/336/EEC and carries the CE-marking accordingly.

New Jersey May 1, 2000 ______ Location Date Bruce Krueger / Quality Manager

European Contact: Your local Agilent Technologies Sales and Service Office or Agilent Technologies GmbH,

Department TRE, Herrenberger Strasse 130, D-71034 Boeblingen (FAX:+49-7031-14-3143)

Acoustic Noise Information

Herstellerbescheinigung

Diese Information steht im Zusammenhang mit den Anforderungen der Maschinenläminformationsverordnung vom 18 Januar 1991. * Schalldruckpegel Lp <70 dB(A) * Am Arbeitsplatz * Normaler Betrieb * Nach EN 27779 (Typprüfung).

Manufacturer's Declaration

This statement is provided to comply with the requirements of the German Sound Emission Directive, from 18 January 1991. * Sound Pressure Lp <70 dB(A) * At Operator Position * Normal Operation * According to EN 27779 (Type Test).

Printing History

The edition and current revision of this manual are indicated below. Reprints of this manual 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 manual. In some cases, the manual change applies only to specific instruments. Instructions provided on the change sheet will indicate if a particular change applies only to certain instruments.

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.

Warranty Information 2 Safety Summary 3 Declaration Page 5 Acoustic Noise Information 7 Printing History 7 Table of Contents 8

1 - QUICK REFERENCE 11

The Front Panel - At a Glance 11 The Rear Panel - At a Glance 12 Instrument Configuration 12 Front Panel Number Entry 13 Front Panel Annunciators 14 Immediate Action Keys 14 Front Panel Menus - At a Glance 15 SCPI Programming Commands - At a Glance 16

2 - GENERAL INFORMATION 17

Document Orientation 17 Safety Considerations 18 Options and Accessories 18 Description and Model Differences 19 Option 521 Description (Agilent 66319B/D only) 23

3 - INSTALLATION 25

Installation and Operation Checklist 25 Inspection 26 Location 27 Input Connections 28 Output Connections 28 DVM Connections 36 External Protection and Trigger Input Connections 38 Digital I/O Connections 40 Computer Connections 40

4 - TURN-ON CHECKOUT 41

Checkout Procedure 41 In Case of Trouble 43

5 - FRONT PANEL OPERATION 45

Introduction 45 Front Panel Description 45 System Keys 47 Function Keys 48 Entry Keys 51 Examples of Front Panel Programming 52

6 - INTRODUCTION TO PROGRAMMING 61

External References 61 VXIplug&play Power Products Instrument Drivers 62 GPIB Capabilities of the DC Source 63 Introduction to SCPI 63 Types of SCPI Commands 64

Types of SCPI Messages 65 SCPI Data Formats 67 SCPI Command Completion 68 Using Device Clear 68 SCPI Conformance Information 69

7 - PROGRAMMING THE DC SOURCE 71

Introduction 71 Programming the Output 71 Triggering Output Changes 73 Making Basic Measurements 75 Making Enhanced Measurements 76 Making DVM Measurements 79 Triggered Measurements 80 Programming the Status Registers 84 Inhibit/Fault Indicator 89

8 - LANGUAGE DICTIONARY 91

Introduction 91 Calibration Commands 96 Display Commands 99 Measurement Commands 100 Output Commands 110 Status Commands 119 System Commands 123 Trigger Commands 124 Common Commands 132

A - SPECIFICATIONS 139

Specifications 139 Supplemental Characteristics 140

B - PERFORMANCE, CALIBRATION, AND CONFIGURATION 143

Introduction 143 Equipment Required 143 Measurement Techniques 144 Performance Tests 145 Constant Voltage Tests 146 Constant Current Tests 148 Resistance Tests 152 DVM Tests 152 Performance Test Equipment Form 153 Performance Test Record Form 154 Performing the Calibration Procedure 156 Performing the Configuration Procedure 161

C - ERROR MESSAGES 163

Error Number List 163

D - EXAMPLE PROGRAMS 167

Pulse Measurements 167

E - LINE VOLTAGE CONVERSION 173

Quick Reference

The Front Panel - At a Glance

1 A 14-character display

shows output measurements and programmed values.

1 2 3

66319D DUAL OUTPUT Mobile Communications DC Source

SYSTEM

Unr Dis OCP

Error

Address

Save

Recall

LINE

CV CC

Channel

Local

Off

2 Annunciators indicate

operating modes and status conditions.

Cal Shift Rmt Addr Err SRQ

Prot

FUNCTION

Input

Meter

345

Protect

78 9

Voltage

Current

3 Rotary control sets voltage,

current, and menu parameters.

Use and to set the resolution; then adjust the value with the knob.

ENTRY

Res

Output

CalOCPProt Cir

Output On/Off

Cir Entry

Enter

Number

Enter

Backspace

! "

4 5 6

4 Turns the dc

source on and off.

5 System keys:

♦ return to Local mode ♦ select output channel ♦ set GPIB address ♦ set RS-232 interface ♦ display SCPI error

codes

♦ save and recall

instrument states

♦ display firmware

revision and serial number.

6 Function keys:

♦ enable/disable the

output

♦ select metering

functions

♦ program voltage and

current

♦ set and clear protection

functions

♦ and

scroll through the front panel menu commands.

7 Entry keys:

♦ enter values ♦ increment or

decrement values

♦ and

select front panel menu parameters.

" !!!!

♦ and

select a digit in the numeric entry field.

1 - Quick Reference

The Rear Panel - At a Glance

1 DVM inputs.

Connector plug is removable.

WARNING:

2 GPIB (IEEE-488)

interface connector.

NO OPERATOR SERVICEABLE PARTS REFER SERVICING TO SERVICE TRAINED

FOR CONTINUED FIRE PROTECTION, USE SPECIFIED LINE

3 Used to connect the

Agilent 14575A remote front panel display.

4 INH/FLT connector. Can

be configured for Digital I/O and Trigger input. Connector

plug is removable.

2 3 4

DVM

OUTPUT 2 0 - 12V / 0 - 1.5A

-S

OUTPUT 1 0 - 15V / 0 - 3A

INH FLT

+-+

5 Output 2 connector

(Agilent 66319B/D only). Connector plug is removable.

5 6

6 Output 1 connector.

Connector plug is removable. IMPORTANT: Install this connector with

7 Power cord

connector (IEC 320)

its supplied sense jumpers before applying power to the unit.

Instrument Configuration

Use the front panel Address key to configure the interface

Refer to “Front Panel Menus - At a Glance”

♦ Enter the GPIB bus address. ♦ Display the firmware revision and serial number.

Quick Reference - 1

Front Panel Number Entry

Enter numbers from the front panel using one the following methods:

Use the arrow keys and knob to change voltage or current settings

NOTE: The output must be ON to see the displayed values change in Meter mode. With the

output enabled, this method changes the output voltage or current immediately.

Use the Function keys and knob to change the displayed settings

Use the arrow keys to edit individual digits in the displayed setting

Increments the flashing digit

Decrements the flashing digit

Moves the flashing digit to the right

Moves the flashing digit to the left

Enters the value when editing is complete

Use the Function keys and Entry keys to enter a new value

NOTE: If you make a mistake, use the Backspace key to delete the number, or press the Meter

key to return to meter mode.

1 - Quick Reference

Front Panel Annunciators

CV CC Unr Dis OCP

Prot

Cal

Shift Rmt

Addr Err

Output 1 or output 2 is operating in constant voltage mode. Output 1 or output 2 is operating in constant current mode. Output 1 or output 2 is unregulated. The output is OFF. Press the Output On/Off key to turn the output on. The over-current protection state is ON. Press the OCP key to turn over-current

protection off. Indicates that the output has been disabled by one of the protection features.

Press the Prot Clear key to clear the protection condition. Calibration mode is ON. Scroll to the Cal Off command and press the Enter key

to exit the calibration mode. The Shift key has been pressed. The remote programming interface is active. Press the Local key to return the

unit to front panel control. The interface is addressed to talk or listen. There is an error in the SCPI error queue. Press the Error key to view the error

code.

SRQ

The interface is requesting service.

Immediate Action Keys

Output

Toggles the output of the selected output between the ON and OFF states.

On/Off

When coupled, turns both output channels ON or OFF.

Activates front panel control when the unit is in remote mode (unless a Lockout

Local

command is in effect).

Resets the protection circuit and allows the unit to return to its last programmed

Shift

A toggle switch that enables or disables overcurrent protection.

Prot Clr Shift

state.

OCP

Front Panel Menus - At a Glance

Address

Recall

Shift Shift

Meter

Voltage

Current

Shift Protect Output

Shift

$$ $

Save Shift Error Channel

$$ $

$$ $$$$ $

$$ $

Res

$$ $

OV Shift

Input

$$$$ $$$$ $$$$

Cal Shift

ADDRESS 7 LANG SCPI REMOTE FP OFF ROM: A.00.00 SN: US12345678 *RCL 0 *SAV 0 ERROR 0

5.000V 0.104A

12.000V 1 0.204A

12.500V MAX

1.000V MIN

12.330V HIGH

0.080V LOW

12.000V RMS

0.350A MAX

0.050A MIN

0.400A HIGH

0.012A LOW

0.210A RMS

12.000V DC:DVM

12.000V RMS:DVM

VOLT 12.000

VOLT 2.000

CURR 2.000

CURR 1.000

RES 1.000 OVERCURRENT *RST COUPLING ALL COMP LLOCAL PON:STATE RST PROT:DLY 0.08 RI LATCHING DFI OFF DFI:SOUR OFF PORT RIDFI DIGIO 7 SENSE:PROT OFF

REL:MODE DD VOLT:PROT 10.000 PROT:STAT ON CURR:RANG MAX CURR:DET ACDC TINT 46.8 POINT 2048 CAL ON

Use and to select parameters (table shows factory defaults). Use to exit any menu.

Only valid for Agilent Model 66319B/D

Sets the GPIB Address Selects language (SCPI) Enables or disables Agilent 14575A remote front panel (ON | OFF) Displays the firmware revision of the instrument Displays the serial number of the instrument Recalls the instrument state Saves the present instrument state Displays the number of errors in the SCPI error queue Toggles the display between output 1 and output 2 (output 2 shown) Measures the output voltage and current (output 1 shown) Measures the peak output voltage Measures the minimum output voltage Measures the high level of a voltage pulse waveform Measures the low level of a voltage pulse waveform Measures the rms voltage Measures the peak output current Measures the minimum output current Measures the high level of a current pulse waveform Measures the low level of a current pulse waveform Measures the rms current Measures the dc voltage on the DVM input Measures the rms voltage on the DVM input

Sets the voltage of output 1 on all models Sets the voltage of output 2

Sets the current limit of output 1 on all models Sets the current limit of output 2

Sets the resistance of output 1 on all models Protection status (example shows overcurrent tripped) Places the dc source in the factory-default state Couples or decouples output 1 and output 2 (NONE or ALL) 1 Sets the output compensation (HREMOTE, LREMOTE, HLOCAL or LLOCAL) Select the power-on state command (RST or RCL0) Sets the output protection delay in seconds Sets the remote inhibit mode (LATCHING, LIVE, or OFF) Sets the discrete fault indicator state (ON or OFF) Selects the DFI source (Q UES, OPER, ESB, RQS, or OFF) Sets the output port functions (RIDFI, DIGIO, or TRIGGER) Sets and reads the I/O port value (0 through 7) Enables or disables the open sense lead detect circuit (ON or OFF) Sets the relay mode for Option 521 units (DD, HD, DH, or HH) (output 1 shown) Sets the programmable voltage limit for output 1 Enables or disables overvoltage protection for output 1 (ON or OFF) Sets the current range (3A, 1A, 0.02A, or AUTO) Sets the current measurement detector (ACDC or DC) Sets the time interval for a front panel measurement in seconds Sets the buffer size for a front panel measurement Accesses calibration menu (See Appendix B)

Only valid for Agilent Model 66321D/66319D

Meter #### &&&&

Quick Reference - 1

1 - Quick Reference

SCPI Programming Commands - At a Glance

NOTE: Some [optional] commands have been included for clarity. Refer to chapter 8 for a

complete description of all programming commands.

ABORt SENSe CALibrate :CURRent :RANGe <n>

:CURRent [:POSitiv e] :DETector ACDC | DC :MEASure :LOWRange :FUNCtion “VOLT” | “CURR” | "DVM" :R3 :LEAD :STATus? :AC :PROTection :STATe <bool> :CURRent2 :DATA <n> :POINts <n> :DATE <date> :TINTerval <n> :DVM :LEVel P1 | P2 [SOURce:] :PASSword <n> CURRent <n> :RESistance :TRIGgered <n> :SAVE :PROTection :STATe <bool> :STATe <bool> [, <n>] CURRent2 <n> :VOLTage [:DC] :TRIGgered <n> :VOLTage2 DISPlay :FUNCtion RIDF | DIG | TRI G <bool> RESistance <n> :CHANnel <channel> :MODE NORMal | TEXT VOLTage <n> :TEXT <display_string> :TRIGgered <n> FORMat :PROTection <n> [:DATA] ASCII | REAL [,length] :STATe <bool> :BORDer NORM | SWAP VOLTage2 <n> INITiate :TRIGgered <n> :SEQuence[1|2] STATus :NAME TRANsient | ACQuire :PRESet :CONTinuous :SEQuence[1], <bool> :OPERation [:EVENt]? :NAME TRANsient, <bool> :CONDition? INSTrument :ENABle <n> :COUPling:OUTPut:STATe NONE | ALL MEASure :PTRansition <n> :CURRent2 [:DC]? :VOLTage2 [:DC]? MEASure | FETCh :ENABle <n> :ARRay :CURRent? :NTRansition <n> :VOLTage? :PTRansition <n> [:CURRent] [:DC]? SYSTem :ACDC? :ERRor? :HIGH? :LANGuage SCPI :LOW? :VERSion? :MAX? TRIGger :MIN? :SEQuence2| :ACQuire [:IMMediate] :DVM [:DC]? :ACDC? :VOLTage [:DC]? :VOLTage <n> :ACDC? :HYSTeresis:CURRent <n> :HIGH? :DVM <n> :LOW? :VOLTage <n> :MAX? :LEVel :CURRent <n> :MIN? :DVM <n> OUTPut [1|2] :VOLTage <n> <bool> :SLOPe :CURRent POS | NEG | EITH :COMPensation :MODE LLOCAL | HLOCAL | LREMOTE | HREMOTE :DVM POS | NEG | EITH :DFI <bool> :VOLTage POS | NEG | EITH :SOURce QUES | OPER | ESB | RQS | OFF :SOURce BUS | INT | EXT :PON :STATe RST | RCL0 [:SEQuence1| :TRANsient][:IMMediate] :PROTection :CLEar :SOURce BUS :DELay <n> :SEQuence1 :DEFine TRANsient :RELay :MODE DD | HD | DH | HH :RI :MODE LATCHing | LIVE | OFF

Only valid for Agi lent 66319B/D 2 Only valid for 66321D/ 66319D

:SWEep :OFFSet :POINts <n>

:WINDow :TYPE “HANN” | “RECT”

DIGital :DATA <n>

:TRIGgered <n>

:NTRansition <n>

:QUEStionable [:EVENt]?

:CONDition?

:COUNt :CURRent <n>

:DVM <n> 2

:SEQuence2 :DEFine ACQuire

General Information

Document Orientation

This manual describes the operation of the Agilent Model 66321B/D Mobile Communications and the Agilent Model 66319B/D Dual Output DC Source. Agilent Models 66321D and 66319D have an additional DVM measurement input on the rear panel. Unless otherwise noted, all models will be referred to by the description "dc source" throughout this manual.

The following Getting Started Map will help you find the information you need to complete the specific task that you want to accomplish. Refer to the table of contents or index of each guide for a complete list of the information contained within.

Getting Started Map

Task Where to find information Quick Reference Section General information

Model differences Capabilities and characteristics Installing the unit Line connections Computer connections Load connections Checking out the unit Verifying proper operation Using the front panel Calibrating the unit Using the front panel Front panel keys Front panel examples Using the programming interface GPIB interface Programming the unit using SCPI commands SCPI commands SCPI programming examples SCPI language dictionary Installing the VXIplug&play instrument driver

NOTE: The driver must be installed on your pc to access the on-line information. Drivers are available on the web at www.agilent.com/find/drivers.

Chapter 1 Chapter 2

Chapter 3

Chapter 4

Chapter 5

Chapter 6

Chapters 7 and 8

Chapter 6

2 - General Informat ion

Safety Considerations

This dc source is a Safety Class 1 instrument, which means it has a protective earth terminal. That terminal must be connected to earth ground through a power source equipped with a ground receptacle. Refer to the Safety Summary page at the beginning of this guide for general safety information. Before installation or operation, check the dc source and review this guide for safety warnings and instructions. Safety warnings for specific procedures are located at appropriate places in the guide.

Options and Accessories

Table 2-1. Options

Option Description

100 120 220 230 8ZJ Delete instrument feet option 004 Output compensation is factory set to HRemote mode for best transient response.

AXS1 Rack mount kit for two side-by-side units of equal depth. Consists of:

1CM1 Rack mount kit for one unit (p/n 5062-3972)

521 Solid-state relays to connect and disconnect the output of the dc source (Agilent 66319B/D

052 Device characterization software for displaying current and voltage measurements.

Support rails are required when rack mounting units. Use E3663A support rails for Agilent rack cabinets. If you are

using non-Agilent rack cabinets, contact the rack manufacturer to obtain support rails for your cabinet.

GPIB cables 1.0 meter (3.3 ft) Agilent 10833A

2.0 meters (6.6 ft) Agilent 10833B

4.0 meters (13.2 ft) Agilent 10833C

0.5 meters (1.6 ft) Agilent 10833D

87−106 Vac, 47−63 Hz 104−127 Vac, 47−63 Hz 191−233 Vac, 47−63 Hz 207−253 Vac, 47−63 Hz

(Refer to chapter 3, under "Output Compensation" for more information)

Lock-link kit (p/n 5061-9694) and Flange kit (p/n 5062-3974)

only). Provides the ability to either Hot-switch or Dry-switch the solid state relays.

Table 2-2. Accessories

Item Part Number

Rack mount with slide - for two side-by-side units of different depths 5062-3996; 1494-0015 Rack mount - for two side by side units of different depths 5062-3996 Rack mount with slide - for one unit 5062-3996; 1494-0015;

5062-4022

General Information - 2

Description and Model Differences

Agilent 66321B

The Agilent 66321B Mobile Communications DC Source is a high performance dc power source that provides peak current sourcing and rapid, basic measurements in a compact, half-rack box. It is designed to simplify the testing of digital wireless communications products. Excellent voltage transient response characteristics prevent test interruptions due to triggering of low voltage phone shutdown. The 15 volt source and 5A peak current capability provides compatibility with a number of communications standards, including: GSM, CDMA, TDMA, PCS, DECT, TERA, PHS, NADC, PHS, and others.

Additional capabilities include fast dynamic measurement and analysis of voltage and current waveforms combined with precision current measurement. This lets you characterize cellular phone current drain under all operating conditions. Programmable output resistance lets you emulate the effects of the internal resistance of a battery. Negative resistance programming lets you compensate for voltage drops that occur between the remote sense points and the phone terminals. Programmable output compensation lets you optimize the transient response for various wire lengths and phone capacitances. Figure 2-1 describes the output characteristic of the dc source.

Agilent 66319B

The Agilent 66319B Mobile Communications DC Source includes all of the capabilities of the Agilent 66321B with the addition of a second, electrically-isolated output. Figure 2-2 describes output characteristic of this second output, which is primarily used to provide voltage or current for a charger input on the device under test. The second output has all of the basic programmable features as the main output, with the exception of the waveform measurement capability, open sense lead detect capability, resistance programming, overvoltage protection, and low and middle current measurement ranges.

Agilent 66321D and 66319D

The Agilent 66321D and 66319D Mobile Communications DC Sources also contain an auxiliary DVM, with input terminals located on the rear panel. This provides limited, low voltage dc and ac measurement capability, which can be used to monitor test point voltages on the unit under test as well as on the test fixture. The common mode voltage range is from −4.5 Vdc to +25 Vdc relative to the minus terminal of output 1. The DVM is programmable from the front panel of the instrument as well as remotely using SCPI programming commands.

Common Features

♦ Voltage, current, and resistance control with 12-bit programming resolution on output 1.

! 3-ampere current source capability (up to 5 amperes for 7 milliseconds). ! Output resistance programming capability from −40 milliohm to 1 ohm. ! Four output compensation modes for a variety of wiring configurations.

♦ Extensive measurement capability on output 1

! dc voltage and current. ! rms and peak voltage and current. ! Three-range current measurement capability up to approximately 7.0 amperes. ! 16-bit measurement resolution.

2 - General Informat ion

! Triggered acquisition of digitized current and voltage waveforms ! External measurement trigger input on units with firmware revision A.03.01 and up

♦ Open sense lead protection on output 1. ♦ Automatic overvoltage protection tracking. ♦ Over-temperature, RI/DFI protection features, programmable voltage limit and current limit. ♦ Non-volatile state storage and recall with SCPI command language. ♦ User-configurable power-on/reset settings (see Appendix B).

Table 2-3. Agilent Model Differences

Item 66321B 66321D 66319B 66319D 66311B/D

0 - 1 A range current measurements (output 1)

0 - 20 mA range current measurements (output 1)

4-mode output compensation (output 1)

Auxiliary output (output2) NO NO YES YES NO YES External DVM input NO YES NO YES 66311D only 66309D only Output resistance

programming (output 1) Automatic overvoltage

tracking (output 1) RS-232 interface NO NO NO NO YES NO Compatibility commands NO NO NO NO YES NO External measurement trigger

input

Earlier models not covered in this manual (order manual p/n 5964-8125)

Available only on units with firmware revision A.03.01 and up

YES YES YES YES NO NO

YES YES YES YES YES YES

YES YES YES YES 2 modes 2 modes

YES YES YES YES NO NO

66309B/D1

Front Panel Controls

The front panel has both rotary and keypad controls for setting the output voltage and current. The panel display provides digital readouts of a number of output measurements. Annunciators display the operating status of the dc source. System keys let you perform system functions such as setting the GPIB address and recalling operating states. Front panel Function keys access the dc source function menus. Front panel Entry keys let you select and enter parameter values. Refer to chapter 5 for a complete description of the front panel controls.

Remote Programming

NOTE: The dc sources described in this manual can only be programmed using the SCPI

programming language.

The dc source may be remotely programmed via the GPIB bus. GPIB programming is with SCPI commands (Standard Commands for Programmable Instruments), which make dc source programs compatible with those of other GPIB instruments. Dc source status registers allow remote monitoring of a wide variety of dc source operating conditions. Refer to chapters 6 and 7 for more information. Chapter 8 is a language dictionary of all SCPI commands that can be used to program the dc source.

General Information - 2

Output 1 Characteristic

The dc source's main output (output 1) characteristic is shown in the following figure. The main output of the dc source may be adjusted to any value within the boundaries shown.

Output

Voltage

ISET

-1.2A

15V

Peak Current

capability for up

to 7 ms shown by dotted lines

Output Current

-2.8A

VSET

Figure 2-1. Dc Source Output 1 Characteristic

The dc source is capable of providing a constant dc output of 15 volts with up to 3 amperes of current. It is capable of sourcing peak currents of up to 5 amperes -- provided the peak current pulse does not exceed 7 milliseconds, and the average current requirement does not exceed 3 amperes. If the unit attempts to draw current for longer than 7 milliseconds, the current limit amplifier will limit the current to a maximum of 3.0712 amps. The peak current capability is illustrated by the dotted line in Figure 2-1.

NOTE: To source up to 5 amperes of current for up to 7 milliseconds, the current limit must

be programmed for greater than 3 amperes (up to a maximum of 3.0712 A).

The dc source can operate in either constant voltage (CV) or constant current (CC) over the rated output voltage and current. Although the dc source can operate in either mode, it is designed as a constant voltage source. This means that the unit turns on in constant voltage mode with the output voltage rising to its Vset value. There is no command for constant current operation. The only way to turn the unit on in constant current mode is by placing a short across the output and then enabling or turning the output on.

Note that the dc source cannot be programmed to operate in a specific mode. After initial turn-on, the operating mode of the unit will be determined by the voltage setting, current setting, and the load resistance. In figure 2-1, operating point 1 is defined by the load line traversing the positive operating quadrant in the constant voltage region. Operating point 2 is defined by the load line traversing the positive operating quadrant in the constant current region.

Figure 2-1 also shows a single range − two quadrant capability. This means that the dc source is capable of sourcing as well as sinking current over the output voltage range from zero volts to the rated voltage. This negative current sinking capability provides fast downprogramming of the output of the dc source. It can also be used to sink current from a battery charger, thus providing battery charger test capability. The negative current is not programmable, and varies linearly from approximately 1.2 amperes at the full rated voltage, to approximately 2.8 amperes at zero output voltage.

2 - General Informat ion

NOTE: Operating the dc source beyond its output ratings may cause the output to become unregulated.

This is indicated by the UNR annunciator on the front panel. The output may also become unregulated if the ac line voltage drops below the minimum rating specified in Appendix A.

Programmable Output Resistance

Programmable output resistance lets you emulate the internal resistance of a cell phone battery, which causes the voltage at the phone to drop as the phone draws more current. Different types of phone batteries have different internal resistance values, which typically fall in a range of several hundred milliohms. The internal resistance of a phone battery also changes with age and the number of times the battery is recharged. Therefore, to evaluate the performance of a cell phone using various battery characteristics, use this feature to specify a desired battery resistance.

Alternatively, programmable output resistance can be used to keep the voltage at the phone terminals as constant as possible. In this case, you may program a negative output resistance. This compensates for any additional voltage drop in the load leads between the remote sense points and the phone terminals (see Figure 3-4). In phone test fixtures, the cell phone terminals may be located up to 50 centimeters away from the connector where the remote sense terminals of the dc source are connected. This results in a small voltage drop in the wires between the remote sense terminals and the phone terminals. If it is critical that the steady-state voltage at the phone terminals be equal to the programmed voltage of the dc source, a small negative output resistance can be programmed to compensate for this voltage drop.

Output 2 Characteristic

As shown in the following figure, Agilent 66319B/D units have a second output rated at 12 V and 1.5A. The second output has all of the primary programmable features as the main output, with the exception of the waveform measurement capability, the open sense lead detect capability, overvoltage protection, and low current range.

Output

Voltage

+12V

Peak Current

capability for up

to 1 ms shown

by dotted lines

3.0A

Output

Current

Figure 2-2. Output 2 Characteristic

1.5A

Tables A-1 through A-3 document the specifications and supplemental characteristics of the Agilent dc sources documented in this manual.

General Information - 2

Option 521 Description (Agilent 66319B/D only)

Option 521 consists of the following enhancements to the output capabilities of Agilent models 66319B/66319D:

♦ Solid-state relays to connect and disconnect the output of the dc source.

The relays are available on the output and sense terminals of outputs 1 and 2. When the solid state relays are open, the output impedance is effectively raised to about 500k ohms for output 1, and about 200k ohms for output 2. Note that the relays open only in response to an Output OFF command.

♦ The ability to either Hot switch or Dry switch the solid state relays.

With Hot switching, the relays control the on/off characteristics of the voltage at the output terminals. With Dry switching, the power mesh controls the on/off characteristics of the voltage at the output terminals. In general, Hot switching activates the relays when current is flowing through them. Dry switching activates the relays when no current is flowing through them. You can specify different relay options for the Output ON and Output OFF commands. The following table describes the actions that occur based on the relay mode selection in response to the ON or OFF commands.

Table 2-5. Option 521 Relay Modes

Relay Mode Output ON Output OFF

Dry (D)

Hot (H)

1. Closes the output relay

2. Closes the sense relay

3. Programs the output

1. Programs the power mesh

2. Closes the output relay

3. Closes the sense relay

1. Downprograms the output

2. Opens the sense relay

3. Opens the output relay

1. Opens the sense relay

2. Opens the output relay

3. Downprograms the power mesh

The relay modes are stored in non-volatile memory. The last selected mode will be restored when the

unit is turned on. When shipped from the factory, the relay mode for both output 1 and output 2 is set to Output ON Hot, Output OFF Hot (HH). The *RST command has no effect on the relay mode.

NOTES: Even with open sense lead detection enabled, the dc source does not check for open

sense leads when output 1 is enabled if the Output ON relay mode is set to Hot.

On output 1 and output 2, with the Output OFF relay mode set to Hot, any external

output capacitors will not be downprogrammed or discharged. This is because the output relay opens prior to the downprogramming of the power mesh.

With either output 1 or output 2 disabled, the output voltage readback will not be correct.

This is because the sense relay is open, effectively breaking the readback path. The voltage readback will be a small negative number.

Table 2-6. Option 521 Factory Settings

Output Coupling

(outputs not coupled)

Output Sense Protection Output Compensation Output 1 Relay Mode Output 2 Relay Mode

None

Off

HRemote

HH HH

Installation

Installation and Operation Checklist

Check the Output Compensation

# Check that the output compensation of the dc source is appropriate for your application. Refer to “Output Compensation” in this chapter. HRemote mode provides the best transient response and can be used with phones having input capacitances from 5µF to 12000µF. Note that if the last two digits on the front panel display are fluctuating when the phone is in standby, you may want to set the output compensation to a different mode. LLocal mode offer the best stability with the lowest bandwidth.

Check the Phone Connections

# If you ARE remote sensing, are the + and −−−− sense leads connected ONLY at the test fixture and within 50 cm of the phone contacts? For best performance, the distance from sense lead termination to the phone contacts should be as short as possible. Refer to “Remote Sense Connections” in this chapter.

# If you are NOT remote sensing, are the sense jumpers installed in the output connector? Ensure that the output connector plug is installed in the unit with its supplied sense jumpers in place. Without sense jumpers, the unit goes into a protect state with the output disabled.

Check the Operating Settings and Conditions

# Are you able to communicate remotely with the dc source? If not, check that the address is set correctly. Refer to "GPIB Interface" in chapter 2.

# Is the Prot or Err annunciator on the front panel on? If yes, clear the fault condition before continuing. Refer to “Clearing Output Protection” in chapter 5.

# Is the Overvoltage circuit shutting the unit down? If yes, you can disable the overvoltage circuit. Refer to “Clearing Output Protection” in chapter 5.

# Is the output load regulation of the unit excessive? If yes, make sure that the output resistance of the unit is set to zero ohms. Refer to “Output Resistance” in chapter 5.

Check the Measurement Settings

# Are the front panel readings unstable? If yes, check that the front panel sampling rate is correct. check the setting of the output compensation. Refer to “Making Front Panel Measurements” in chapter 5 and “Output Compensation” in this chapter.

Also

# Are you measuring dynamic output currents? If yes, check that the current detector is set to ACDC. Refer to “Making Front Panel Measurements” in chapter 5.

# Are you measuring output currents < 1 A or < 20 mA? If yes, check that the current range is set appropriately. Refer to “Making Front Panel Measurements” in chapter 5.

3 - Installation

Inspection

Damage

When you receive your dc source, inspect it for any obvious damage that may have occurred during shipment. If there is damage, notify the shipping carrier and the nearest Agilent Sales and Support Office immediately. The list of Agilent Sales and Support Offices is at the back of this guide. Warranty information is printed in the front of this guide.

Packaging Material

Until you have checked out the dc source, save the shipping carton and packing materials in case the unit has to be returned. If you return the dc source for service, attach a tag identifying the owner's name and address, the model number, and a brief description of the problem.

Items Supplied

The following user-replaceable items are included with your dc source. Some of these items are installed in the unit.

Table 3-1. Items Supplied

Item Part Number Description

Power Cord contact the nearest Agilent

Sales and Support Office

Digital I/O connector

Output connector

DVM connector

Sense jumpers 8120-8821 Jumpers that insert into output connector for local

Line Fuse 2110-0638

Feet 5041-8801 feet for bench mounting User's Guide 5964-8125 This manual. Contains installation, checkout, front

1252-1488 4-terminal digital plug for connecting digital I/O leads.

0360-2604 5-terminal output plug for connecting load and sense

1252-8670 3-terminal plug for DVM connections (66319B/D)

2110-0773

A power cord appropriate for your location.

The connector installs in the back of the unit.

leads. This connector installs in the back of the unit.

sensing. Connect +s to +, and −s to −.

3.15 AT (time delay) for 100/120 Vac operation

1.6 AT (time delay) for 220/230 Vac operation

panel, and programming information.

Cleaning

Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally.

WARNING: To prevent electric shock, unplug the unit before cleaning.

Installation - 3

Location

Figure 3-1 gives the dimensions of your dc source. The dc source must be installed in a location that allows sufficient space at the sides and back of the unit for adequate air circulation (see Bench Operation).

NOTE: This dc source generates magnetic fields that may affect the operation of other

instruments. If your instrument is susceptible to operating magnetic fields, do not locate it in the immediate vicinity of the dc source. Typically, at three inches from the dc source, the electromagnetic field is less than 5 gauss. Many CRT’s, such as those used in computer displays, are susceptible to magnetic fields much lower than 5 gauss. Check susceptibility before mounting any display near the dc source.

Bench Operation

Do not block the fan exhaust at the rear of the unit.

A fan cools the dc source by drawing air in through the sides and exhausting it out the back. Minimum clearances for bench operation are 1 inch (25 mm) along the sides.

Rack Mounting

The dc source can be mounted in a standard 19-inch rack panel or cabinet. Table 2-1 documents the part numbers for the various rack mounting options that are available for the dc source. Installation instructions are included with each rack mount option.

NOTE: Support rails or an instrument shelf is required when rack mounting units.

Figure 3-1. Outline Diagram

3 - Installation

Input Connections

Connect the Power Cord

Connect the power cord to the IEC 320 connector on the rear of the unit. If the wrong power cord was shipped with your unit, contact your nearest Agilent Sales and Support Office to obtain the correct cord (refer to the list at the back of this guide).

Check the line voltage rating label on the back of the unit to make sure that it agrees with your ac mains voltage. Refer to appendix E if the voltage at your site is different from the voltage indicated on the unit.

Output Connections

Turn the unit off before connecting any wires.

Output 1

The main output connector (output 1) has a termination for the + and − output, the + and − sense terminals, and an earth ground terminal. The 5-pin connector is removable and accepts wires sizes from AWG 22 to AWG 12. Disconnect the mating plug from the unit by pulling it straight back.

IMPORTANT: You must connect the sense terminals on Output 1 for the unit to operate properly. Refer

to the section on "Open Sense Lead Protection" in this chapter. Install the connector plug with its supplied sense jumpers before applying power to the unit.

Output 2

Agilent 66319B/D units have a second output connector (output 2). It has the same configuration as the main output connector. It has a termination for the + and − output, the + and − sense terminals, and an earth ground terminal. The 5-pin connector is removable and accepts wires sizes from AWG 22 to AWG

12. Disconnect the mating plug from the unit by pulling it straight back. You must connect the sense terminals on Output 2 for the unit to meet its published specifications.

Current Ratings

Fire Hazard To satisfy safety requirements, load wires must be large enough not to overheat when

carrying the maximum short-circuit current of the dc source.

The following table lists the characteristics of AWG (American Wire Gage) copper wire.

Table 3-2. Ampacity and Resistance of Stranded Copper Conductors

AWG No. Maximum Ampa city (in

free air)

24 3.52 0.0843 0.0257 22 5.0 0.0531 0.0162 20 8.33 0.0331 0.0101 18 15.4 0.0210 0.00639 16 19.4 0.0132 0.00402 14 31.2 0.0083 0.00252 12 40 0.0052 0.00159

Resistance (at 20 deg. C)

Ω

ΩΩΩΩ/m

Ω/ft

ΩΩ

Installation - 3

Voltage Drops and Lead Resistance

To optimize the performance and transient response in your test system, please observe the following guidelines:

♦ Twist the load leads together and keep them short. The shorter the leads, the better the performance. ♦ When remote sensing, twist the sense leads together but do not bundle them in with the load leads. ♦ For best performance, keep the total cable length to the load to 20 ft or less when remote sensing.

(Note that the unit has been tested with cable lengths of up to 40 feet.)

The load wires must also be of a diameter large enough to avoid excessive voltage drops due to the impedance of the wires. In general, if the wires are heavy enough to carry the maximum short circuit current without overheating, excessive voltage drops will not be a problem.

The maximum allowable value of load lead resistance is 4 ohms total (2 ohms per side). This may be further limited to a lower value, based on peak current loading, by the maximum allowable dc voltage drop of 8 volts total (4 volts per side) as specified for remote sense operation. To illustrate, for up to 3 amps peak, the maximum allowable resistance is 2.67 ohms total, resulting in a maximum voltage drop of up to 8 volts. For 5 amps peak the maximum allowable resistance is 1.6 ohms total, again resulting in a maximum allowable voltage drop of up to 8 volts.

In addition to keeping dc resistance low, you also need to minimize the total impedance. For higher slew rate currents (0.2 amps/µs) and long wiring lengths (10 to 20 ft.) the inductance can have as much effect as the resistance. To minimize inductance, twist the load leads. The inductance will be on the order of

0.25 µH/ft if twisted, and 0.4 µH/ft if untwisted. In addition to lowering the inductance, twisting the leads will reduce noise pick up. If you are using remote sense leads, connect these as a second twisted pair. Do not twist or bundle them with the load leads.

NOTE: The use of relays between the dc source and the phone also increases impedance. Low

resistance relays will improve system performance.

Remote Sense Connections

NOTE: You must use remote sensing on both Output 1 and Output 2 for the unit to operate

properly and meet its published specifications. If you are not using output 1 and the open sense protection feature is turned ON, you must jumper the + output 1 pin to its + sense pin, and jumper the - output 1 pin to its - sense pin. Otherwise, the unit will go into a protected state and disable the output (unless open sense protection is turned OFF).

Testing has verified stable performance with up to 20 inches of lead length between the sense lead termination and the phone connection (see figure 3-4). However, for optimum performance, connect the sense leads as close as possible to the phone under test. To minimize inductance, connect the sense leads and load leads as separate twisted pairs (see figure 3-2).

Connect the sense leads carefully so that they do not become open-circuited. If the sense leads are left unconnected or become open during operation, the dc source will not regulate the output voltage. See "Open Sense Lead Protection".

3 - Installation

OUTPUT 1/OUTPUT 2 CONNECTOR

TWIST PAIR

-S - + +S

TWIST LEADS

LOAD

WIRE RESISTANCE

Figure 3-2. Remote Sense Connections

Connect the remote sense leads only to the remote sense connections at the output connector and at the location on the test fixture where you want to sense the output voltage. There must be not be any continuity from the sense leads to earth ground or from the sense leads to the output leads other than at the test fixture. The open sense detect circuit will check for continuity in the sense leads when the output turned on (from disabled to enabled).

Figure 3-3 shows how to connect remote sense leads and load leads when external disconnect relays are included in the load path.

NOTE: In this arrangement, the output of the unit should be programmed OFF before the relays

are switched. This is because if the load leads are opened before the sense leads, the overvoltage protection circuit will trip if it is enabled.

OUTPUT 1/OUTPUT 2 CONNECTOR

-S - + +S

TWIST LEADS

TWIST PAIR

LOAD

WIRE RESISTANCE

DISCONNECT RELAYS

Figure 3-3. Remote Sense Connections with External Relays

Installation - 3

Figure 3-4 shows how to connect remote sense leads when using a removable test fixture. Note that in this configuration, the wires in the part of the test fixture where the phone is located must be less than 50 cm (20 inches) in length. This is for stability as well as for the fact that the remote sense leads cannot compensate for the voltage drop in this part of the test fixture.

Programming a negative output resistance lets you compensate for the unsensed voltage drop in the load leads between the remote sense points and the phone terminals. First, you must measure or calculate the resistance of the wires between the test fixture and the phone terminals (see table 3-2). Then you can program the equivalent negative output resistance. This will compensate for the voltage drop in this short section of wire. Note that the maximum negative resistance that you can program is −40 milliohms.

OUTPUT 1 CONNECTOR

-S - + +S

CAN USE NEGATIVE RESISTANCE PROGRAMMING TO COMPENSATE FOR LEAD RESISTANCE

TWIST LEADS

TWIST PAIR

LOAD

WIRE RESISTANCE

FIXTURE

CONNECTIONS

LENGTH MUST BE UNDER 50 CM (20 INCHES)

Figure 3-4. Remote Sense Connections with Test Fixture

NOTE: The built-in overvoltage protection circuit automatically compensates for the voltage

drop between the output terminals and the remote sense lead connections. Refer to "OVP Considerations" later in this chapter for more information.

Load Regulation and Voltage Drop in the Remote Sense Leads

The sense leads are part of the dc source's feedback path and must be kept at a low resistance to maintain optimal performance. One way to accomplish this is to use larger diameter wires for the sense leads (see Table 3-2).

If this is impractical, you can account for the voltage regulation and readback error that will occur when using higher resistance remote sense leads. The voltage load regulation and readback error can be calculated using the following formula:

∆V =

LD+

RS+

(

+ 251

S+

)

+ V

LD-

RS-

(

+ 184

S-

)

where: V R

LD+

and RS- are the resistances of the + and − sense leads.

S+

and V

are the voltage drops in the + and − load leads.

LD-

3 - Installation

Minimizing the load lead resistance reduces voltage drops V by decreasing the resistance of the sense leads (R

and RS-) as much as possible. In situation where ∆V

S+

LD+

and V

. ∆V can be further minimized

LD-

cannot be minimized any further, it may be compensated by programming a negative output resistance as previously discussed.

Maintaining Stability while Remote Sensing

The remote sense bandwidth and slew rate of standard dc power sources are adequate for compensating for load lead voltage drop for slow to moderate rates of load changes. However, the high pulsed current draw of digital cellular phones presents a challenge to standard dc power sources operating in remote sense mode. Their bandwidth and slew rate are not adequate for dealing with the 0.05 to 0.2 amp/µs slew rates imposed by these devices. A large voltage transient occurs at the load, due to the inability of the dc source to keep up with the rate of load change.

The dc source effectively compensates for load lead voltage drops resulting from very high slew rate load current transitions. This keeps the remotely sensed output voltage at a relatively constant level. For 0.05 amp/µs to 0.2 amp/µs slew rate loading in typical test applications, the transient voltage is reduced more than an order of magnitude over that of other standard dc sources.

Open Sense Lead Protection

The main output (output 1) of the dc source has built-in open sense protection circuitry that detects if there is an open in either the positive or the negative remote sense lead or load lead path. For battery powered devices, undetected open sense connections can cause incorrect battery charger calibration, incorrect test results due to erroneous voltage settings, and low voltage phone shutdown due to a large transient voltage drop.

To enable open sense lead detection from the front panel, press the SENS:PROT, press

& to select ON, then press Enter. To have the unit turn on with open sense detection

Output key, use ' to scroll to

enabled, save this state in location 0 and set the power-on state to RCL 0. When this circuit is enabled, the sense and load leads are checked every time the output transitions

from disabled to enabled (off to on). If a lead opens while the output is enabled, this will not be detected immediately by the open sense circuit. However, the output voltage will increase or decrease, depending on which one of the leads is open. Turning the output off, then on again, will cause the unit to check the output sense and load leads and determine if a sense lead is open.

If the open sense lead protection circuit detects an open sense lead, the Prot annunciator on the front panel turns on and the output turns off. Bit 5 in the Questionable Status Registers is also set (see chapter 7 under "Programming the Status Registers"). On the front panel, press the Prot key, and one of the following error messages will be reported on the front panel:

Message + sense open

- sense open +/- sense open sense open

Description

Positive sense or load lead is open Negative sense or load lead is open Both positive and negative sense or load leads are open Incorrect resistance reading on the sense or load leads. This may be caused by an

external power source paralleled with the output, or in rare instances, by the voltage being out of calibration.

Installation - 3

The default setting for the open sense lead protection circuit is disabled or OFF. This is because applications that apply an external voltage to the output or that use external disconnect relays may interfere with the operation of the open sense detect circuit. If you are using external voltages or relays, you can enable the open sense detect at the beginning of the test procedure. Make sure that the external voltage is disabled and that any relays are in the closed position. Perform the remote sense check by cycling the output off, then on. Then disable the open sense detect circuit and continue using the unit.

Local Sensing

Local sensing is not recommended for optimal performance. You must use the remote sense connections on both the main output (output 1) and on output 2 for the unit to operate properly and meet its published specifications. If you are not using remote sensing and the open sense protection feature is ON, you must jumper the + output 1 pin to its + sense pin, and jumper the - output 1 pin to its - sense pin. Otherwise, the unit will go into a protected state with the output disabled.

♦ Keep load leads as short as possible. Load leads cannot exceed 18 inches (per side) when local

sensing.

♦ Bundle or twist the leads tightly together to minimize inductance. ♦ Jumper the + output 1 pin to its + sense pin, and the - output 1 pin to its - sense pin.

OUTPUT 1/OUTPUT 2 CONNECTOR

-S - + +S

JUMPER

TWIST LEADS

EACH LEAD MUST

BE LESS THAN 20

INCHES IN LENGTH

WIRE RESISTANCE

LOAD

Figure 3-5. Local Sensing

Output Compensation

High bandwidth performance and stability are achieved by using a software-switchable output compensation circuit. This compensation circuit has four bandwidth positions to optimize the response for different ranges of phone capacitance. The compensation function is set using either the front panel COMP command located in the Output menu (see chapter 5), or the OUTput:COMPensation:MODE command as explained in chapter 8. The circuit covers the following approximate capacitance ranges:

♦ LLocal mode: 0 to 12,000 µF ♦ LRemote mode: 2 µF to 12,000 µF ♦ HLocal mode: 0 to 12,000 µF

♦ HRemote mode: 5 µF to 12,000 µF

3 - Installation

Refer to the previous discussion under "Remote Sense Connections" and "Local Sensing" for more information about remote and local sensing. Standard dc source units are shipped from the factory with the output compensation set to HRemote mode. This mode provides the fastest output response but requires an external capacitor for stable operation.

To program the compensation mode from the front panel, press the COMP command, press &

& to select one of the four compensation mode settings, and then press Enter.

Output key, use ' to scroll to the

To have the unit turn on with a different output compensation setting, save this state in location 0 and set the power-on state to RCL 0. The following table summarizes the four programmable compensation modes.

Mode

Description

Used for slower response with short load leads or bench operation. This produces the

LLocal

slowest output response, but provides the best stability (no external capacitor needed).

LRemote HLocal HRemote

Corresponds to Low mode on earlier models (66311B/D, 66309B/D).

Corresponds to High mode on earlier models (66311B/D, 66309B/D).

Used for slower response with long load leads using remote sensing. Use for faster response with short load leads or bench operation (no external cap needed).

Used for faster response with long load leads using remote sensing. This produces the fastest output response, but requires an external capacitor for stable operation.

If you do not know the input capacitance of the phone that you are testing, leave the input capacitance set to LLocal mode initially. This is because in LLocal mode, the output of the dc source will be stable when testing cellular phones that have virtually any input capacitance (from 0 µF to 12,000 µF). LLocal mode however, has the slowest transient response (see appendix A).

The HRemote mode output compensation setting provides the fastest transient response performance for phones with input capacitances greater than 5µF. Most phones have input capacitances greater than 5 µF. However, the operation of the dc source may be momentarily unstable with phones that have input capacitances less than 5 µF, or if the output sense leads are not connected and you are operating in HRemote mode.

Use the output sense detect circuit to first determine that the sense and load leads are properly connected to the device under test. Then, if you are testing phones in HRemote mode and want to determine if the input capacitance of your phone is less than 5 µF, perform the following test.

NOTE: It is important that this test is done with the dc source installed in the test system where it

will be used, since system stability is also dependent on wiring and the phone impedance.

1. Connect the phone to the dc source and place it in standby mode.

2. Check the last two digits of the voltage reading on the front panel of the dc source.

3. If the last two digits are fluctuating, it is an indication that the phone capacitance may be less than

5 µF and the dc source is unstable.

4. Place the output compensation of the dc source in LLocal mode.

5. If the last two digits of the voltage reading are now stable, your phone most likely has an input

capacitance less than 5 µF.

Installation - 3

OVP Considerations

CAUTION: Disabling the overvoltage protection circuit may cause excessive output voltages, which

can damage the phone under test.

The dc source is shipped from the factory with its overvoltage protection (OVP) circuit enabled. This built-in overvoltage protection function is not programmable; it is set to automatically trip when the output voltage measured at the sense lead terminals exceeds the programmed voltage by two volts. Having the overvoltage and the output voltage sensing at the same point provides a more effective method of load protection than if the overvoltage is sensed only at the output terminals of the dc source. To disable the OVP circuit, use either the front panel VOLT PROT command located in the OV menu, or the VOLTage:PROTection:STATe SCPI command as explained in chapter 8.

The built-in overvoltage protection circuit reduces the number of nuisance overvoltage shutdown events since it trips only when the sense lead voltage exceeds the programmed voltage by two volts. In situations such as where the external remote sense leads are shorted, the OVP circuit will shut down the unit if the voltage measured at the output terminals exceeds the programmed voltage by three volts. Lastly, the OVP circuit will shut the unit down if the voltage at the output terminals exceeds 18 volts for any reason, such as when remote sensing around an excessive load lead resistance.

The OVP circuit contains a crowbar SCR, which effectively shorts the output of the dc source whenever the OVP trips. However, if an external current source such as a battery is connected across the output and the OVP is inadvertently triggered, the SCR will continuously sink a large current from the battery, possibly damaging the dc source. To avoid this, you can either disable the OVP circuit or you can connect an external protection diode in series with the output of the dc source. Connect the anode of the diode to the + output terminal.

The OVP circuit's SCR crowbar has also been designed to discharge capacitances up to a specific limit, which is 50,000 µF. If your load capacitance approaches this limit, it is recommended that you do not intentionally trip the OVP and discharge the capacitance through the SCR as part of your normal testing procedure, as this may lead to long-term failure of some components.

Programmable Voltage Protection

In addition to the automatic overvoltage protection circuit, the dc source includes programmable voltage protection for output 1. This feature lets you limit the maximum allowable output voltage that can be programmed either from the front panel or over the GPIB. This feature is useful in situations where accidentally programming higher output voltages within the operating range of the dc source can permanently damage the phone under test.

For example, suppose that a phone under test, which requires the output voltage to be adjusted up to 6 V, can be damaged if the output voltage exceeds 9 volts. You can set the programmable voltage limit to 6 volts using either the front panel VOLT:PROT command in the OV menu, or the VOLTage:PROTection SCPI command as explained in chapter 8. If an attempt is then made to program the output voltage to a value greater than 6 volts, the unit goes into voltage protection mode and turns its output off.

NOTE: The VOLT:PROT front panel and SCPI commands do not program the tracking OVP

circuit, which automatically tracks the output voltage and trips when the output voltage

exceeds the programmed voltage by two volts.

3 - Installation

DVM Connections

CAUTION: The DVM may be damaged if voltages at the input terminals exceed ±50 Vdc to ground.

The DVM connector has three pins: plus, minus, and earth ground. The 3-pin connector is removable and accepts wires sizes from AWG 22 to AWG 14. Disconnect the mating plug by pulling it straight back.

The DVM is designed as an auxiliary measurement input that can measure voltages on circuits that are powered by the main output (output 1). Voltage measurements can be made on test points inside the phone under test, or on test points located on the test fixture that is connected to the main output. Figure 3-6 illustrates a common measurement application for the DVM. This example is only provided for illustration; your specific application will vary depending on the type of test and type of phone.

Test Fixture

66319D 66321D

OUTPUT 1

Minus

terminal

lead resistance

load current

lead resistance

−−−−

V common m ode

battery

connector

connector for

internal phone

circuits

LOAD

DVM INPUT

-4Vdc < (V comon mode) < +25V dc

Figure 3-6. DVM Measurement Example

NOTE: The DVM is not designed to measure voltages that are greater than +25 Vdc or less than

−4.5 Vdc with respect to the negative terminal of the main output. The following sections discuss restrictions that apply when using the DVM to measure voltages on circuits that are not powered by the main output, or that are floating with respect to the main output.

Measuring Circuits that are Not Powered by the Main Output

To obtain correct voltage measurements, keep the common mode voltage within the specified limits. Common mode voltage is defined as the voltage between either DVM input terminal and the negative terminal of the main output (output 1). The common mode voltage range is from −4.5 Vdc to +25 Vdc. Attempting to measure voltages outside this range may result in incorrect readings due to clipping by the internal DVM measurement circuits.

NOTE: Do not confuse the common mode voltage with the DVM voltage readback. The DVM

voltage readback is a differential measurement from one input lead to the other input lead. This quantity may be as high as ±25 Vdc, depending on the orientation of the input leads.

Installation - 3

Because the measurement circuits of the DVM are internally referenced to the minus terminal of the main output, you must observe the following restrictions in order to guarantee accurate DVM measurements (refer to figure 3-7).

66319D 66321D

DVM INPUT

OUTPUT

Minus

terminal

−−−−

load current

lead resistance

−−−−

lead resistance

Test Fixture

DVM

LOAD

DVM

(for illustration only)

R1 12V

R2 12V

R3 12V

R4 2V

R5 2V

R6 2V

36V

6V DC

Node # V Common Mode

36 V + V 24 V + V

12 V + V

- 2 V + V

- 4 V + V

- 6 V + V

NOTE: The DVM common mode voltage range is from

-4.5Vdc to +25Vdc. voltages outside this range will result in erroneous readings.

Figure 3-7. Measuring Circuits Not Powered by the Main Output

You cannot measure voltages greater than +25 Vdc with respect to the negative terminal of the main

♦

output. A situation where this could occur is illustrated by R1 in figure 3-7, which has only a 12 Vdc drop across it but is 36 Vdc + Vlead with respect to the negative terminal of the main output.

♦ You cannot measure voltages less than −4.5 Vdc with respect to the negative terminal of the main

output. A situation where this could occur is illustrated by R6 in figure 3-7, which has only a −2 Vdc drop across it but is −6 Vdc + Vlead with respect to the negative terminal of the main output.

♦ When calculating the common mode voltage between the point that you wish to measure and the

negative terminal of the main output, you must also include any voltage drop in the negative load lead. For example, in figure 3-7, if the voltage drop in the negative load lead is 2 V, you would not be able to correctly measure the 12 Vdc drop across R2. This is because when the voltage drop in the load lead is added to the voltage drops across R2 and R3, the resultant voltage is 26 Vdc, which exceeds the +25 Vdc common mode rating of the DVM.

3 - Installation

Measuring Circuits that are Floating with Respect to the Main Output

In the example shown in figure 3-8, the common mode voltage between the DVM inputs and the minus terminal of the main output (output 1) includes an undefined floating voltage that may result in incorrect readings due to clipping by the internal DVM measurement circuits. This will occur when the −4.5 Vdc to + 25 Vdc common mode voltage range is exceeded.

The solution to this problem would be to provide a known or controlled common mode voltage by connecting a jumper wire from the floating voltage to be measured to the main output. In this example, the main output is set to 5V, the ac voltage to be measured is approximately 6 Vac (±8.5 Vpeak), and a jumper wire connects one side of the bias transformer to the + main output terminal. This stabilizes the common mode voltage and offsets it by the output voltage value (5 V). The peak common mode voltage is now: +8.5V + 5 V = +13.5 V on the positive side, and

−8.5V + 5 V = −3.5 V on the negative side; with both voltages now being within the common mode range of the DVM.

6 V Bias Transformer

winding capacitance

66319D 66321D

DVM INPUT

OUTPUT 1

+ 5 V

−−−−

umper wire

DVM

6 Vac;

8.5 Vpk

winding capacitance

stray

capacitance

GND

Typically, low voltage with respect t o GND due to internal bypass capaci tors.

GND

Undefined float voltage with respect to GND due to capacitive currents . Could be tens of volts ac or more.

Figure 3-8. Measuring Circuits Floating with Respect to the Main Output

External Protection and Trigger Input Connections

A 4-pin connector and a quick-disconnect mating plug are provided on each instrument for accessing the Fault/Inhibit functions, the measurement Trigger input, or the Digital I/O functions (see Table 3-3).

The connector accepts wires sizes from AWG 22 to AWG 12. Disconnect the mating plug to make your wire connections.

NOTE: It is good engineering practice to twist and shield all signal wires to and from the digital

connectors. If shielded wire is used, connect only one end of the shield to chassis ground to prevent ground loops.

Installation - 3

Table 3-3. 4-Pin Connector Configurations

PIN TRIGGER FAULT/INHIBIT DIGITAL I/O 1 Not used FLT Output Output 0 2 Not used FLT Common Output 1 3 Trigger Input INH Input Input/Output 2 4 Trigger Common INH Common Common

When functioning in Fault/Inhibit mode , the fault (FLT) output, also referred to as the DFI (discrete fault indicator) signal, is an open collector circuit that pulls the positive output low with respect to the negative (chassis-referenced) common. The high impedance inhibit (INH) input, also referred to as the RI (remote inhibit) signal, is used to shut down the dc source output whenever the INH + is pulled low with respect to the INH (chassis -referenced) common. Figure 3-9 shows how you can connect the FLT/INH and trigger input circuits of the dc source.

In example A, the INH input connects to a switch that shorts the Inhibit pin (+) to common whenever it is necessary to disable output of the unit. This activates the remote inhibit (RI) circuit, which turns off the dc output. The front panel Prot annunciator comes on and the RI bit is set in the Questionable Status Event register. To re-enable the unit, first open the connection between pins INH + and common and then clear the protection circuit. This can be done either from the front panel or over the GPIB.

In example B , the FLT output of one unit is connected to the INH input of another unit. A fault condition in one of the units will disable all of them without intervention either by the controller or external circuitry. The computer can be notified of the fault via a service request (SRQ) generated by the Questionable Status summary bit. Note that the FLT output can also be used to drive an external relay circuit or signal other devices whenever a user-definable fault occurs.

A) INH Example with One Unit

NOTE: Connectors

are removable

INH FLT

. . . .

+ - +

C) Measurement trigger example

NOTE: Connectors

are removable

TRG N.U.

. . . .

4 3 2 1

INH Input

INH Common

4 3 2 1

Switch

(Normally

Open)

Trigger signal or contact closure

Signal Common

B) FLT Example with Multiple Units

4 3 2 1

INH FLT

. . . .

+ - +

INH Input

4 3 2 1

INH Input

FLT Output

Figure 3-9. FLT/INH Examples

In example C, when functioning as a measurement trigger input, a negative-going edge signal applied to the TRG input sends an external trigger signal to the trigger system. You can either apply a negativegoing edge signal to the TRG input pin (referenced to common), or apply a contact switch to short the TRG input to common. Note that in this configuration, pins 1 and 2 are not used.

3 - Installation

Digital I/O Connections

As shown in Table 3-3 and Figure 3-10, the 4-pin connector can also be configured as a digital I/O port. Information on programming the digital I/O port is found in chapter 5 and under [SOURce:]DIGital:DATA and [SOURce:]DIGital:FUNCtion commands in chapter 8. The electrical characteristics of the digital connector are described in appendix A.

Digital Output

Ports 0, 1, 2

Digital Input

Port 2

TTL, AS, CMOS, HC

NOTE: Connectors

are removable

INH FLT

Coil Curr ent

0.25A Max.

4 3 2 1

+16.5V Max.

Relay Driver

Ports 0, 1, 2 (contains internal

clamp diodes for inductive flyback)

. . . .

+ - +

A) Relay Circuits

B) Digital Interface Circuits

Figure 3-10. Digital I/O Examples

Computer Connections

The dc source can be controlled through a GPIB interface. Follow the GPIB card manufacturer's directions for card installation and software driver setup.

GPIB Interface

Each dc source has its own GPIB bus address, which can be set using the front panel Address key as described in chapter 5. GPIB address data is stored in non-volatile memory. The dc source is shipped with its GPIB address set to 5.

Dc sources may be connected to the GPIB interface in series configuration, star configuration, or a combination of the two, provided the following rules are observed:

♦ The total number of devices including the GPIB interface card is no more than 15. ♦ The total length of all cables used is no more than 2 meters times the number of devices connected

together, up to a maximum of 20 meters. (Refer to table 2-2 for a list of available GPIB cables.)

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

Turn-On Checkout

Checkout Procedure

Successful tests in this chapter provide a high degree of confidence that your unit is operating properly. For performance tests, see appendix B.

NOTE: To perform the checkout procedure, you will need a wire for shorting the output

terminals together.

The following procedure assumes that the unit turns on in the factory-default state. If you need more information about the factory default state, refer to the *RST command in chapter 8. Note that the values shown in the Display column may not exactly match the values that appear on the front panel of the unit.

If you have not already done so, connect the power cord to the unit and plug it in. Connect the output connector to the back of the unit with the sense jumpers installed.

Procedure Display Explanation

1. Turn the unit on. The dc source undergoes a self-test when you first turn it on.

**********

ADDRESS 5

0.000V 0.0001A

During selftest, all display segments are briefly lit, followed by the GPIB Address.

The display then goes into meter mode with the Dis annunciator on, and all others off. In Meter mode the

n.nnnV digits indicate the output voltage and the .nnnnA digits indicate the output current. The

flashing digit on the display indicates the digit that will be affected if changes are ma de to the displayed values using the rotary control or the # and & keys. You will only see the changes if the output is ON.

NOTE: Press the Meter key to exit a menu at any time and return to meter mode. If the Err

annunciator on the display is on, press the Shift key followed by the Error key to see the error number. See table 4-1 at the end of this chapter.

2. Check that the fan is on. You should be able to hear the fan and feel the air

coming from the back of the unit.

3. Unplug the output connector from the back of the unit.

-0.224V 0.0000A The output voltage indicates approximately -0.2 volts because the output sense connections have opened.

Press Output, scroll to

SENSE:PROT and select ON. Press Enter

Press Output On/Off

Press Protect

SENSE:PROT ON Enables the open sense detect circuit.

-0.224V 0.0000A The open sense detect circuit disables the output. The

Dis annunciator is off, but the Prot annunciat or is on.

+/- SENSE OPEN Display indicates the protection condition.

4 - Turn-On Checkout

Procedure Display Explanation

7. Plug the output connector back into the unit.

Press Shift, Prot Clear

Press Voltage

10.

Press Enter Number, <15>, Enter

11.

Press Output On/Off

12. Connect a jumper wire across the + and - output terminals.

13.

Press Output On/Off.

14.

Press Current,

Enter Number, <1>, Enter.

15.

Press Shift, OCP

Restores the output sense connections. The Prot annunciator is still on.

NO FAULT

Clears the protection condition. Prot is off; CV is on.

VOLT 0.000 Display shows the output voltage setting of the unit. VOLT <15>

15.003V 0.0001A

Programs the main output to 15 volts. After the value is entered, the display returns to Meter mode. Because the output is enabled, the meter will indicate the actual output voltage.

0.000V 0.0000A Turn the output off. Shorts the output of the unit.

0.004V 3.0712A

The CC annunciator is on, indic ating that the unit is in constant curr ent mode. The unit is sourcing output current at the maximum rating, which is the default output current limit setting.

CURR <1> Programs the output current to 1 ampere.

0.001V 0.0003A You enabled the overcurrent protection circuit. The circuit then tripped because the unit was operating in constant current mode. The CC annunci ator turns off, and the OCP and Prot annunciators turn on.

16.

Press Shift, OCP

0.001V 0.0003A You have disabled the overcurrent protection circuit. The OCP annunciator turns off.

17.

Press Shift, Prot Clear

0.004V 0.998A

Restores the output. The Prot annunciator turns off. The CC annunciator turns on.

18. Turn the unit off and remove the shorting wire from the

The next time the unit turns on it will b e restored to

the *RST or factory default state.

output terminals.

Only perform steps 19 to 29 if you are verifying an Agilent 66319B or 66319D unit. Procedure Display Explanation

19. Turn the unit on. Wait for selftest to complete and press Shift, Channel.

20.

Press Voltage,

Enter Number, <12>, Enter.

21.

Press Output On/Off

22.

Press Output On/Off

0.025V 0.0002A

Shift Channel toggles between channel 1 and channel

2. The left-most digit of the display identifies the output channel that is presently being controlled. It will indicate a "1" for channel 1, or "2" for channel 2.

VOLT <12> Programs the output 2 voltage to 12 volts.

12.005V 0.0002A

Turns the main output and output 2 on. The Dis annunciator is off, but the CV annunciator is on.

0.000V 0.0000A Turn all outputs off.

Procedure Display Explanation

Turn-On Checkout - 4

23. Connect a jumper wire across the + and - terminals of output 2.

24.

Press Output On/Off.

25.

Press Current,

Enter Number, <1>, Enter.

26.

Press Shift, OCP

27.

Press Shift, OCP

28.

Press Shift, Prot Clear

29. Turn the unit off and remove the shorti ng wire from the output terminals.

Shorts output 2 of the unit.

0.004V 1.520A

CURR <1> Programs the output 2 current to 1 ampere.

0.001V 0.0003A You enabled the overcurrent protection circuit. The

0.001V 0.0003A You have disabled the overcurrent protection circuit.

0.004V 0.998A

The next time the unit turns on it will be restored to the

The CC annunciator is on, indic ating that output 2 i s in constant current mode. Output 2 is sourcing current at its maximum rating, which is the default current limit setting.

circuit then tripped because output 2 was operating in constant current mode. The CC annunci ator turns off, and the OCP and Prot annunciators turn on.

The OCP annunciator turns off. Restores output 2. The Prot annunciator turns off. The

CC annunciator turns on.

*RST or factory default state.

In Case of Trouble

Dc source failure may occur during power-on selftest or during operation. In either case, the display may

show an error message that indicates the reason for the failure.

Selftest Error Messages

Pressing the Shift, Error keys will show the error number. Selftest error messages appear as: ERROR <n> where "n" is a number listed in the following table. If this occurs, turn the power off and then back on to see if the error persists. If the error message persists, the dc source requires service.

Table 4-1. Power-On Selftest Errors

Error No. Failed Test

Error 0 No error Error 1 Non-volatile RAM RD0 section checksum failed Error 2 Non-volatile RAM CONFIG section checksum failed Error 3 Non-volatile RAM CAL section checksum failed Error 4 Non-volatile RAM STATE section checksum failed Error 5 Non-volatile RST section checksum failed Error 10 RAM selftest Error 11 to 14 VDAC/IDAC selftest 1 to 4 Error 15 OVDAC selftest Error 80 Digital I/O selftest error

4 - Turn-On Checkout

Runtime Error Messages

Appendix C lists other error messages that may appear at runtime. Some of these messages will also appear on the front panel when the Prot key is pressed. To clear the error, you must remove the condition that caused the error and then press the Prot Clear key.

Table 4-2. Runtime Error Messages

Error Description

Overvoltage an overvoltage condition has occurred Overcurrent an overcurrent condition has occurred Overtemperature an overtemperature condition has occurred Remote inhibit a remote inhibit signal has been applied to the RI input + sense open a positive sense or load lead is open

- sense open a negative sense or load lead is open +/- sense open a positive and negative sense or load lead is open sense open incorrect voltage reading on the sense leads, the unit may need to be

recalibrated

If the front panel display shows OVLD , this indicates that the output voltage or current is beyond the range of the meter readback circuit. If this is the case, check that the setting of the output compensation is correct for the phone you are testing. If the front panel display indicates -- -- -- -- -- , an GPIB measurement is in progress.

Line Fuse

If the dc source appears "dead" with a blank display and the fan not running, check your ac mains to be certain line voltage is being supplied to the dc source. If the ac mains is normal, the internal line fuse may be defective.

Refer to Appendix E and follow the procedure described in the appendix for accessing and replacing the line fuse located inside the unit. Do not change any of the line voltage connections.

NOTE: If the dc source has a defective fuse, replace it only once. If it fails again, the dc source

requires service.

Front panel Operation

Introduction

Here is what you will find in this chapter:

♦ a complete description of the front panel controls ♦ front panel programming examples

NOTE: The dc source must be in set to Local mode to use the front panel controls. Press the

Local key on the front panel to put the unit in local mode.

Front Panel Description

1 2 3

66319D DUAL OUTPUT Mobile Communications DC Source

LINE

SYSTEM

Unr Dis OCP

Error

Address

Save

Recall

Input

Meter

345

Protect

78 9

CV CC

Channel

Local

Off

Cal Shift Rmt Addr Err SRQ

Prot

FUNCTION

Voltage

Current

Res

Output

CalOCPProt Cir

Output On/Off

4 5 6

Figure 5-1. Front Panel, Overall View

ENTRY

Cir Entry

Enter

Number

Enter

Backspace

5 – Front Panel Operation

1111 Display

2222 Annunciators

3333 Rotary Control

4444 Line

5555 System Keys

14-character vacuum fluorescent display for showing output measurements and programmed values.

Annunciators light to indicate operating modes and status conditions:

CV The dc source output is in constant-voltage mode. CC The dc source output is in constant-current mode. Unr The dc source output is in an unregulated state. Dis The dc source output is disabled (off). OCP The overcurrent protection state is enabled. Prot One of the dc source's output protection features is activated. Cal The dc source is in calibration mode. Shift The Shift key is pressed to access an alternate key function. Rmt The GPIB interface is in a remote state. Addr The interface is addressed to talk or to listen. Err There is a message in the SCPI error queue. SRQ The interface is requesting service from the controller.

The rotary control lets you set the output voltage or current as well as menu parameters. Press the knob.

This turns the dc source on or off. The system keys let you:

Return to Local mode (front panel control) Set the dc source GPIB address Selects the remote programming interface Select the output channel on units with more than one output Display SCPI error codes and clear the error queue Save and recall up to 4 instrument operating configurations Select the programming language Enable/disable the remote front panel interface

" and !!!! to select the resolution, then adjust the value with

6666 Function Keys

7777 Entry Keys

Function access command menus that let you: Enable or disable the output Select metering functions Program output voltage, current, and resistance Display the protection status state Set and clear protection functions Set the output state at power-on Calibrate the dc source Select the output compensation

' and ( scroll through the front panel menu commands

Entry keys let you: Enter programming values Increment or decrement programming values

# and & select the front panel menu parameters

Front Panel Operation - 5

System Keys

Refer to the examples later in this chapter for more details on the use of these keys.

SYSTEM

Channel

Local

Figure 5-2. System Keys

Error

Address

Save

Recall

This is the blue, unlabeled key, which is also shown as in this guide.

Shift

Pressing this key accesses the alternate or shifted function of a key (such as

ERROR ). Release the key after you press it. The Shift annunciator is lit,

indicating that the shifted keys are active.

Local

Press to change the dc source's selected interface from remote operation to local (front panel) operation. Pressing the key will have no effect if the interface state is already Local, Local-with-Lockout, or Remote-with-Lockout.

Address

Press to access the address menu. All entries are stored in non-volatile memory.

Display Command Function

ADDRESS <value> Sets the GPIB Address LANG <char> Selects language (SCPI) REMOTE FP <char> Enable/disable 14575A front panel interface (ON or OFF) ROM <char> Firmware revision number SN: <char> Unit serial number

Recall

Press to place the dc source into a previously stored state. You can recall up to 4 previously stored states (0 through 3).

Channel Shift

Shift

Press to display the system error codes stored in the SCPI error queue. This

Error

Pressing these keys toggles the display between output 1 and output 2.

Display Measurement

<reading>V <reading>A Measures output channel 1

<reading>V <reading>A Measures output channel 2

action also clears the queue. If there is no error in the queue, 0 is displayed.

Save Shift

Press to store an existing dc source state in non-volatile memory. The parameters saved are listed under *SAV as described in chapter 8. You can save up to 4 states (0 through 3).

Notes:

Use and to scroll through the command list. Use and to scroll through the parameter list.

value = a numeric value char = a character string parameter

( '

# &

5 – Front Panel Operation

Function Keys

Refer to the examples later in this chapter for more details on the use of these keys.

FUNCTION

Input

Meter

Voltage

Res

Output

Prot Cir

Protect

OCP

Current

Cal

Output On/Off

Figure 5-3. Function Keys

Immediate Action Keys

Immediate action keys immediately execute their corresponding function when pressed. Other function keys have commands underneath them that are accessed when the key is pressed.

Output On/Off

Shift

Prot Clr Shift

OCP

This key toggles the output of the dc source between the on and off states. When coupled, the key affects both output channels. It immediately executes its function as soon as you press it. When off, the dc source output is disabled and the Dis annunciator is on.

Press this key to reset the protection circuit and allow the unit to return to its last programmed state. The condition that caused the protection circuit to become active must be removed prior to pressing this key, or the unit will shut down again and display the Prot annunciator again.

Press this key to toggle between OCP enabled and disabled. If OCP is enabled the output will become disabled if the output mode changes from CV to CC mode. The OCP annunciator indicates the state of OCP.

Scrolling Keys

Scrolling keys let you move through the commands in the presently selected function menu.

% $$$$

Press to bring up the next command in the list. Press to go back to the previous command in the list. Function menus are circular; you can return to the starting position by continuously pressing either key. The following example shows the commands in the Input function menu:

CURR:RANGE <char>

( (

CURR:DET <char>

Front Panel Operation - 5

Metering Keys

Metering keys control the metering functions of the dc source. As set from the factory, all front panel measurements from the main output (output 1), are calculated from a total of 2048 readings taken at a

46.8 microsecond sampling rate. Therefore, the factory default acquisition time for a single front panel

measurement is about 100 milliseconds. Refer to “Making Front Panel Measurements” for more information about changing the front panel sampling rate and the number of measurement points.

All front panel measurements from the DVM and from output2 are fixed at 2048 measurement readings taken at a 15.6 microsecond sampling rate.

NOTE: The front panel sample rate and data point settings are separate and independent of the

sample rate and data point settings that are programmed over the GPIB interface. When an GPIB measurement is in progress, the front panel display temporarily indicates

-- -- -- -- --. Front panel measurements resume when the GPIB measurement completes.

Meter

Press this key to access the meter menu list. Also use this key to exit a

menu at any time and return to meter mode.

Display Measurement

Shift Input

Display Command Function

Notes:

reading = the returned measurement value = a numeric value char = a character string parameter Us e and to scroll through the menu commands. Us e and to scroll through the menu parameters.

<reading>V <reading>A Measures output dc voltage and current <reading>V MAX Measures peak output voltage <reading>V MIN Measures minimum output voltage <reading>V HIGH Measures the high level o f a voltage waveform <reading>V LOW Measures the low level of a voltage waveform <reading>V RMS Measures rms voltage <reading>A MAX Measures peak output current <reading>A MIN Measures minimum output current <reading>A HIGH Measures the high level of a current waveform <reading>A LOW Measures the low level of a current waveform <reading>A RMS Measures rms current <reading>V DC:DVM Measures dc voltage on DVM input <reading>V RMS: DVM Measures rms voltage on DVM input

Press this key to access the following metering functions.

CURR:RANGE <char> Select current range (3A | 1A | 0.02A | AUTO) CURR:DET <char> Select current measurement bandwidth TINT <value> Sets the front panel measurement interval in seconds

(15.6 µs to 1 second)

POINTS <char> Sets the # of points in front panel measurement buffer

only valid for Agilent 66321D/66319D

' ( # &

Use and to select a digit in a numeric entry field.

" !

( 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048)

(ACDC | DC)

5 – Front Panel Operation

Output Control Keys

Output control keys control the output functions of the dc source.

Voltage

Display Command Function

Current

Display Command Function

Res Shift

Display Command Function

Output

Display Command Function

Protect

Display Command Function

OV Shift

Display Command Function

Cal Shift

Notes:

value = a numeric value char = a character string parameter Us e and to scroll through the menu commands. Us e and to scroll through the menu parameters.

Press this key to access the voltage menu.

VOLT <value> Sets the voltage of output 1 (the main output of all models)

VOLT <value> Sets the voltage of output 2

LIMIT <char> Sets the programmable voltage limit (output 1 shown)

Press this key to access the current menu.

CURR <value> Sets the current of output 1 (the main output of all models)

CURR <value> Sets the current of output 2

Press this key to access the resistance menu.

RES <value> Sets the resistance of output 1 (the main output of all models)

Press this key to access the output menu list.

*RST Places the dc source in the factory-default state COUPLING <char> Couples or decouples output 1 and output 2 (NONE | ALL) COMP <char> Sets output compensation (HREMOTE | LREMOTE | HLOCAL | LLOCAL) 1 PON:STATE <char> Select the power-on state command (RST | RCL0) PROT:DLY <value> Sets the output protection delay in seconds RI <char> Sets the remote inhibit mode (LATCHING | LIVE | OFF) DFI <char> Sets the discrete fault indicator state (ON | OFF) DFI:SOUR <char> Selects the DFI source (QUES | OPER | ESB | RQS | OFF)2 PORT <char> Sets the output port functions (RIDFI | DIGIO | TRIGGER) DIGIO <char> Sets and reads the I/O port value (0 through 7) SENSE:PROT<char> Enables or disables the open sense lead detect circuit (ON | OFF)

REL:MODE <char> Sets the relay mode for option 521units (DD, HD, DH, or HH)

(applies to both outputs; output 1 shown)

Press this key to display protection status.

OVER CURRENT Status of the protection features (example shows overcurrent) NO FAULT Status of the protection features (example shows none tripped)

Press this key to access the overvoltage protection menu.

PROT:STAT <char> Enables or disables overvoltage protection (ON | OFF)

This key accesses the calibration menu (Refer to Appendix B for details).

These parameters are explained in chapter 3.

These status summary bits are explained in chapter 7.

These relay modes are explained in chapter 2

( ' # & " !

Use and to select a digit in a numeric entry field.

Front Panel Operation - 5

Entry Keys

Refer to the examples later in this chapter for more details on the use of these keys.

Cir Entry

Enter

Number

Enter

ENTRY

Backspace

Figure 5-4. Entry Key s

&&&& #

These keys let you scroll through choices in a parameter list that apply to a specific command. Parameter lists are circular; you can return to the starting position by continuously pressing either key. If the command has a numeric range, these keys increment or decrement the existing value. In meter mode, these keys can be used to adjust the magnitude of the output voltage or current. Only the flashing digit is changed by these keys. Use the

" and !!!! keys to move the flashing

digit.

! """"

These keys move the flashing digit in a numeric entry field to the right or left. This

Enter Number

Used only to access a third level key function - the numeric entry keys. These third

lets you increment or decrement a specific digit in the entry field using the

& keys or the RPG knob.

# and

level function keys are labeled in green.

Back space

The backspace key deletes the last digit entered from the keypad. This key lets you

9 0

−−−−

0 through 9 are used for entering numeric values. . is the decimal point. −

minus sign. For example, to enter 33.6 press:

Enter Number, 3, 3, . , 6, Enter.

− is the

−−

correct one or more wrong digits before they are entered.

Shift

This key aborts a keypad entry by clearing the value. This key is convenient for

Clear Entry

correcting a wrong value or aborting a value entry. The display then returns to the previously set function.

Enter

This key executes the entered value or parameter of the presently accessed

command. Until you press this key, the parameters you enter with the other Entry keys are displayed but not entered into the dc source. Before pressing can change or abort anything previously entered into the display. After

Enter, you

Enter is

pressed, the dc source returns to Meter mode.

5 – Front Panel Operation

Examples of Front Panel Programming

You will find these examples on the following pages: 1 Using the front panel display 2 Setting the output voltage, current, and compensation 3 Setting the output 2 voltage and current 4 Querying and clearing output protection 5 Making basic front panel measurements 6 Making enhanced front panel measurements 7 Making DVM measurements 8 Programming the digital port 9 Setting the GPIB address 10 Storing and recalling instrument states

1 - Using the Front Panel Display

Select an output on Agilent 66319B/D units

Action Display

Press Meter to return the display to Meter mode. Press Shift Channel to toggle between channel 1 and channel 2. The left-most digit of the front panel display identifies the output channel that is presently being controlled by the front panel. It will indicate either a "1" for channel 1, or "2" for channel 2.

7.003V 0.004A

You can only select an output when the unit is in metering mode. Once an output has been selected, only the menu commands that apply to that output will appear on the display. Output -specific menu commands are identified by a 1 or a 2. Also, the CV, CC, and UNR a nnunciators apply to the selected channel.

Select the DVM on Agilent 66321D/66319D units

Action Display

You must select output 1 to use the DVM. If output 1 is not selected, the DVM's

measurement menu is not displayed. On the Function keypad press Meter and press ( repeatedly to access the DVM

measurement commands. DVM measurement commands are identified by the "DVM" string segment. When accessed, DVM measurement functions are automatically active. Refer to example 3 for more information.

8.013V 0.003A

<reading>V DC:DVM

Independently Control Output 1 and Output 2 on Agilent 66319B/D units

Action Display

On the Function keypad, press Output. Scroll to the COUPLING command. To uncouple the outputs, use the # numeric key to select NONE, then press Enter.

COUPLING NONE

2 - Setting the Output Voltage, Current, Resistance, Compensation, and Relay Mode

This example shows you how to set the output voltage, current, and resistance. It also shows you how to set the compensation circuit for either high or low capacitance cellular phones. Relay mode only applies to units that have Option 521 installed. Note that no front panel changes affect the output of the unit unless it has been enabled.

Front Panel Operation - 5

Set the output voltage

Action Display

1. To enter an approximate value without using the voltage menu: On the Entry keypad, press " or ! to select the 1's digit in the voltage field. Then rotate the front panel RPG knob to obtain 7 V.

If the unit is in CC mode, you won't see the output voltage change until the voltage setting is low enough to cause the unit to go into CV mode.

The easiest way to enter an accurate value: On the Function keypad, press Voltage. On the Entry keyp ad, press Enter Number, 7, Enter.

3. To make minor changes to an existing value: On the Function keypad, press Voltage. On the Entry keypad, press " or ! to select the digit in the numeric field that you wish to change. For example, move the flashing digit to the ones column to change a value in this column. Then, press # to scroll from 7.000 to 8.000. Then press Enter.

7.003V 0.004A

VOLT 7.000

VOLT 8.000

Set the output current limit

Action Display

1. To enter an approximate value without using the current menu: On the Entry keypad, press " or ! to select the tenths digit in the current field. Rotate the front panel RPG knob to obtain 0.4A.

If the unit is in CV mode, you will not see the output current change until the current setting is low enough to cause the unit to go into CC mode.

The easiest way to enter an accurate value: On the Function keypad, press Current. On the Entry keyp ad, press Enter Number, .4, Enter.

8.003V 0.400A

CURR 0.400

To make minor changes to an existing value, press Current. The procedure to change an individual digit is explained in step 3 under "Set the output voltage."

NOTE: To output currents pulses greater than 3 A and up to 5 A peak, you must set the output

current limit to greater than 3 amperes (3.0712 amperes max).

Set the output resistance

Action Display

On the Function keypad, press Shift Res. On the Entry keypad, press Enter Number, 0.5, Enter.

To make minor changes to an existing value, press Shift Res. The procedure to change an individual digit is explained in step 3 under "Set the output voltage."

RES 0.500

Set the output compensation

Action Display

On the Function keypad, press Output. Then press ( until you obtain the COMP command. Use the & key and select one of the four compensation modes. Then press Enter. Use response when testing phones with input capacitances greater than 5 µF, which applies for most phones. Select local or remote depend ing on your sensing setup.

If operation of the dc source becomes momentarily unstable when testing phones that have input capacitances under 5 compensation.

HREMOTE or HLOCAL compensation for faster transient

F, Use either LREMOTE or LLOCAL

COMP HREMOTE

5 – Front Panel Operation

Setting the relay mode (Agilent 66319B/66319D with Option 521 only)

Action Display

Use Output ON/OFF to make sure that the output of the selected channel is off. The output must be turned off before any relay settings take effect. If the Dis annunciator is lit, the output is o ff.

Press Meter to return the display to Meter mode.

Press Shift Channel to select either output channel 1 or output channel 2.

On the Function keypad, press OUTPUT. Then scroll to the REL:MODE c ommand.

3.6V 2.04A

7.5V 1.04A

REL:MODE HH

Use the & key to select one of the relay mod es (DD, DH, HD, or HH) then press Enter. The Output ON mode is specified first, followed by the Output OFF mode.

Relay

settings cannot be coupled; they must be set separately for each output.

Enable the output

Action Display

On the Function keypad, press Output On/Off to enable the output. The Dis

8.003V 0.500A annunciator will go off, indicating that the voltage is now applied to the output terminals. The A display indicates the actual output current. Note that when the outputs are coupled, this command also enables or disables output 2.

3 - Setting the Output 2 Voltage and Current (Agilent 66319B/66319D only)

This example shows you how to set the voltage and current for output 2. Selecting an output was discussed in the previous example. Note that no front panel changes affect the output of the unit unless it has been enabled.

Set the output 2 voltage

Action Display

Press Meter, then Shift, Channel to select output 2. On the Entry keypad, press " or ! to select the 1's digit in the voltage field. Then rotate the front panel RPG knob to obtain 7 V.

If the unit is in CC mode, you won't see the output voltage change until the voltage setting is low enough to cause the unit to go into CV mode.

An alternate way to enter a value: On the Function keypad, press Voltage. On the Entry keypad, press Enter Number, 7, Enter.

To make minor change s t o an existing value: On the Func tion keypad, press Voltage. On the Entry keyp ad, press " or ! to select the digit in the numeric field that you wish to change. For example, move the flashing digit to the ones column to change a value in this column. Then, press # on the Entry keypad to scroll from 7.000 to 8.000. Then press Enter.

7.003V 0.004A

VOLT 7.000

VOLT 8.000

Set the output 2 current limit

Action Display

1. Select output 2 as described in example 1. On the Entry keypad, press " or ! to select the tenths digit in the current field. Rotate the front panel RPG knob to obtain 0.4A.

If the unit is in CV mode, you will not see the output current change until the current setting is low enough to cause the unit to go into CC mode.

An alternate way to enter a value: On the Function keypad, press Current. On the Entry keypad, press Enter Number, .4, Enter.

8.003V 0.400A

CURR 0.400

Front Panel Operation - 5

To make minor changes to an existing value, press Current. The procedure to change an individual digit is explained in step 3 under "Set the output 2 voltage."

NOTE: To draw current pulses greater than 1.5 A and up to 2.5 A peak on output 2, set the

output current limit higher than 1.5 amperes (1.52 amperes max). Do not enable OCP, or else make sure that the protection delay setting is longer than the expected current pulse.

Enable the output

Action Display

On the Function keypad, press Output On/Off to enable output 2. The Dis annunciator will go off, indicating that the voltage is now applied to the output terminals. The display indicates the actual output values. Note that when the outputs are coupled, this command also enables or disables output 1.

8.003V 0.500A

4 - Querying and Clearing Output Protection and Errors

If an overvoltage, overcurrent, overtemperature or remote inhibit condition occurs, the Prot annunciator

on the front panel will be on and the dc source will disable its output. If necessary, you can disable the overcurrent or overvoltage protection circuit if its operation interferes with the proper operation of your phone test. Note that if you disable the overvoltage protection, the equipment under test will not be protected from output voltage overshoot conditions. You can also disable the broken sense lead detect circuit if you have an application where an external voltage applied to the output may interfere with the broken sense lead detect circuitry.

Error messages can occur at any time during the operation of the unit. When the Err annunciator on the front panel is on it means that either an error has occurred on the GPIB bus, or a selftest error has occurred. Appendix C lists error numbers and descriptions.

Query and clear the dc source overcurrent protection as follows:

Action Display

On the Function keypad, press Protect. In this example, an over current condition has occurred. Refer to Table 4-2 for other protection indicators.

On the Function keypad, press Current. This displays the present current limit. CURR 3.0712

3. To restore normal operation after the cause of the overcurrent condition has been removed, press Shift, Prot Clr. T he Prot annunc iator then will go off.

To disable overcurrent protection, press Shift, OCP. This key toggles between OCP enabled and disabled. The OCP annunciator is off when OCP is disable d.

OVERCURRENT

Disable Overvoltage Protection as follows:

On the Function keypad, press Shift, OV. Use the & key and select OFF to disable the overvoltage protection function. Then press Enter. To recall this state when the unit turns on, save this state in location 0 and set the power-on state to RCL 0 (see example #10).

PROT:STAT OFF

Query and Clear Errors as follows:

On the Function keypad, press Shift, Error. This displays and clears the error in the error queue. Repeatedly press these keys to clear all errors in the queue. If errors persist, your unit may require service.

ERROR 0

5 – Front Panel Operation

5 – Making Basic Front Panel Measurements

As shipped from the factory, front panel measurements for the main output (output 1) are calculated from a total of 2048 readings taken at a 46.8 microsecond sampling rate. The unit alternates between voltage and current measurements. Therefore, the data acquisition time for a single front panel voltage or current measurement is about 100 milliseconds. This sampling rate and data acquisition time combined with a built-in windowing function, reduces errors due to sampling a non-integral number of cycles of a waveform for frequencies of 25 Hz or greater. Note that the windowing function is less accurate when measuring output waveforms for frequencies less than 25 Hz, causing the front panel meter to jitter.

There are no trigger controls for front panel measurements. However, you can program both the sampling rate and the number of data points in each front panel measurement using commands in the Input menu. With this flexibility, measurement accuracy can be improved for waveforms with frequencies as low as several Hertz. The sample buffer size may be varied from 1 to 2048 data points in discrete binary values. The sampling rate may be varied from 15.6 microseconds to 1 second. Values are rounded to the nearest

15.6 microsecond interval. Note that the front panel sample interval and buffer size settings are

independent of the sample interval and buffer size that you program over the GPIB. This is because you can qualify measurement triggers over the GPIB, which makes the GPIB measurements independent of the front panel measurements. Refer to chapter 8 for more information about GPIB measurements.

To have the unit turn on with the reconfigured buffer size and sampling rate, save this state in location 0 and set the power-on state to RCL 0. Note that front panel measurements parameters for output 2 are not programmable. They are fixed at 2048 data points with a 15.6 microsecond sampling rate.

NOTE: If the front panel display indicates OVLD, the output has exceeded the measurement

capability of the instrument. If the front panel display indicates -- -- -- -- -- -- , an GPIB measurement is in progress.

Use the Meter menu for making front panel measurements:

Action Display

On the Function keypad press Meter to access the following measurement parameters: dc voltage and current

2. To change the front panel time interval and buffer size for output waveform

measurements, press Shift, Input. Then press ( until you obtain the TINT command. Use the Entry keys to enter a value from 15.6 microseconds to 1 second in seconds. Then press Enter.

Continue by pressing Shift, Input and ( until you obtain the POINT command. Press & to select a different buffer size. The choices are: 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, and 2048. Then press Enter.

One reason to change the front panel time interval and data points is if the waveform being measured has a period shorter than 3 times the present front panel acquisition time.

<reading>V <reading>A TINT 0.002

POINT 1024

Front Panel Operation - 5

6 – Making Enhanced Front Panel Measurements

The following figure illustrates the enhanced measurement capabilities of Agilent Models 66321B/D and 66319B/D for measuring output waveforms. These include peak (max), minimum, high level, and low level measurements as illustrated in the following figure. Rms and dc voltages are calculated from the number of points in the measurement window.

V or A MAX

V or A HIGH

V or A LOW

V or A MIN

100 millisecond

acquisition time

46.8 microsecond sampling rate

NOTE:

Measurement samples may not

coincide with the actual ma xim u m or minim um point of the waveform.

Figure 5-5. Default Front Panel Measurement Parameters

All models have three current measurement ranges that can be selected in the Input menu. A maximum current range is available for measuring output currents of up to 7 amperes. A 1 A current range is available for measuring currents up to 1A. A 0.02A current range is available for improved resolution when measuring output currents below 20 milliamperes. The low current measurement range is accurate to 0.1% of the reading ±2.5 microamperes. When the current Range is set to AUTO, the unit automatically selects the range with the best measurement resolution.

NOTE: In the 0.02A current measurement range, the current detector is fixed at DC. With the

current detector in dc, accurate current measurements cannot be made on waveforms with frequency contents over 1 kilohertz.

Use the Meter menu for making front panel measurements:

Action Display

On the Function keypad press Meter and press ( repeatedly to access the following measurement parameters:

♦ dc voltage and current ♦ peak voltage ♦ minimum voltage ♦ high level of a voltage pulse waveform ♦ low level of a voltage pulse waveform ♦ rms voltage ♦ peak current ♦ minimum current ♦ high level of a current pulse waveform ♦ low level of a current pulse waveform ♦ rms current

2. To change the front panel time interval and buffer size for output waveform

measurements, press Shift, Input. Then press ( until you obtain the TINT command. Use the Entry keys to enter a value from 15.6 microseconds to 1 second in seconds. Then press Enter.

<reading>V <reading>A <reading>V MAX <reading>V MIN <reading>V HIGH <reading>V LOW <reading>V RMS <reading>A MAX <reading>A MIN <reading>A HIGH <reading>A LOW <reading>A RMS

TINT 0.002

5 – Front Panel Operation

One reason to change the front panel time interval and data points is if the waveform being measured has a period shorter than 3 times the present front panel acquisition time.

For current measurements, press Shift, Input. Then press & until you obtain the CURR:RANG AUTO command. Press Enter to activate autoranging. Three other selections are also available. Select the 3A range when measuring currents up to 7A. Select the 1A range when measuring currents up to 1A. Select the

0.02A range for improved resolution when measuring currents below 20 mA. Note that the 0.02A range is only appropriate for making dc measurements.

For output waveform measurements, press Shift, Input. Then press ( until you obtain the CURR:DET command. Check to make sure that the ACDC current detector is selected. This provides the best accuracy for waveform measurements. Only select the DC current detector if you are making dc current measurements and you require a dc measurement offset better than 2mA on the High current measurement range. Press Enter to activate any changes.

POINT 1024

CURR:RANG AUTO

CURR:DET ACDC

7 – Making DVM Measurements (Agilent 66321D/66319D only)

The front panel DVM measurement function is only active when Output 1 is selected.

As shipped from the factory, DVM measurements are calculated from a total of 2048 readings taken at a

15.6 microsecond sampling rate. These parameters are fixed. Therefore, the data acquisition time for a single measurement is about 30 milliseconds. This sampling rate and data acquisition time combined with a built-in windowing function reduces errors due to sampling a non-integral number of cycles of a waveform for frequencies of 47 Hz or greater.

NOTE: If the front panel display indicates OVLD, the output has exceeded the measurement

capability of the instrument. If the front panel display indicates -- -- -- -- -- -- , a front panel or an GPIB measurement is in progress.

Check that the DVM measurement points are within the DVM measurement capabilities:

The common mode voltage range of the DVM input is −4.5 V to +25 V from either DVM input with respect to the negative output terminal of output 1. The maximum isolation voltage to ground is ±50 Vdc. Refer to chapter 3 under "DVM Connection" for more information on how this affects the DVM's measurement capability.

Use the Meter menu for making DVM measurements:

Action Display

On the Function keypad press Meter and press ( repeatedly to access the following DVM measurement parameters:

♦ dc voltage ♦ rms voltage (ac + dc rms)

<reading>V DC:DVM

<reading>V RMS:DVM

Front Panel Operation - 5

8 - Programming Output Port Functions

You can configure the output port to perform three different functions. In RIDFI mode, the port functions as a remote inhibit input with a discrete fault indicator output signal. In DIGIO mode, the port acts as a digital Input/Output device. In TRIGGER mode, the port accepts external measurement trigger signals.

To configure the RIDFI mode of the port, proceed as follows:

Action Display

On the Function keypad, press Output.

2. Scroll through the Output menu by pressing (. The PORT command lets you select

either the RIDFI, DIGIO, or TRIGGER function. Press Enter when done.

3. Scroll to the RI command to configure the Remote INHibit indicator. Use the # and & keys to select either LIVE or LATCHING, either of which enable the RI indicator. Then press Enter. With RI enabled, a low-true on the INH input will disable the output of the unit. LIVE causes the output of the unit to track the state of the INH input. LATCHING latches the output of the unit off in response to the inhibit signal.

4. Access the Output menu again and scroll through the menu. The DFI co mmand le ts you enable the Discrete Fault Indicator. Use the & key and select ON to enable the FLT output. Then press Enter. With the FLT output enabled, the open-collector logic signal can be used to signal external devices when a fault condition is detected.

5. Scroll to the DFI:SOUR command to select the internal source that drives this signal. Use the & key to select from the RQS or ESB bits, or the Operation or Questionable status registers. Then p ress Enter. Status summary bits are explained in chapter 7.

*RST PORT RIDFI

RI LIVE RI LATCHING

DFI ON

DFI:SOUR RQS DFI:SOUR ESB DFI:SOUR OPER DFI:SOUR QUES

To configure the DIGIO mode of the port, proceed as follows:

Action Display

On the Function keypad, press Output.

2. Scroll through the Output menu by pressing (. The PORT command lets you select the DIGIO function. Press Enter when done.

*RST PORT DIGIO

3. Scroll to the DIGIO command to set and read the Digital Input/Output Port. Press Enter Number and enter a number from 0 to 7 to program the three bits (0 programs all bits low; 7 programs all bits high). Press Enter when done.

DIGIO 5

To configure the TRIGGER mode of the port, proceed as follows:

Action Display

On the Function keypad, press Output.

2. Scroll through the Output menu by pressing (. The PORT command lets you select the TRIGGER function. Press Enter when done.

*RST PORT TRIGGER

9 - Setting the GPIB Address

Your dc source is shipped with the GPIB address set to 5. This address can only be changed from the front panel using the Address menu located under the

Set the GPIB address as follows:

Action Display

On the System keypad, press Address.

Enter the new address. For example, Press Enter Number, 7, Enter.

Address key.

ADDRESS 5 ADDRESS 7

5 – Front Panel Operation

10 - Storing and Recalling Instrument States

You can save up to 4 states (from location 0 to location 3) in non-volatile memory and recall them from the front panel. All programmable settings are saved. This capability is only available when the unit is set to the SCPI programming language.

NOTE: You can program the unit to automatically power-on according to the instrument state

that is saved in state 0 as shown in the third example.

Save an instrument state in location 0 as follows:

Action Display

1. Set the instrument to the state that you want to save.

Save this state to location 0. Press Save, Enter Number, 0, Enter.

*SAV 0

Recall a saved state as follows:

Action Display

Recall the state saved in location 0 by pressing Recall, Enter Number, 0, Enter

*RCL 0

Select the power-on state of the dc source as follows:

Action Display

On the Function keypad, press Output, and scroll through the Output menu until you get to the PON state command.

2. Use the # and & keys to select either RST or RCL0. RST sets the power-on state of

the unit as defined by the *RST command. RCL0 sets the power-on state of the unit to the state saved in *RCL location 0. Press Enter when done.

PON:STATE RST

Clear the non-volatile memory of the dc source as follows:

Action Display

On the Function keypad, press Output, Enter. This returns the unit to the factorydefault settings.

Save these settings to location 0. Press Save, Enter Number, 0, Enter.

3. Repeat step #2 for memory locations 1 through 3. *SAV 1

*RST

*SAV 0

*SAV 2 *SAV 3

Introduction to Programming

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.

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

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

6 - Introduction to Pr ogramming

VXIplug&play Power Products Instrument Drivers

VXIplug&play instrument drivers for Microsoft Windows 95 and Windows NT are now available on the Web at http://www.agilent.com/find/drivers. These instrument drivers provide a high-level programming interface to your Agilent Technologies instrument. VXIplug&play instrument drivers are an alternative to 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

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

System Requirements

The VXIplug&play Power Products instrument driver complies with the following:

Microsoft Windows 95

( (

Microsoft Windows NT 4.0

(

HP VISA revision F.01.02

( National Instruments VISA 1.1

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.

6. To use the VXIplug&play instrument driver, follow the directions in the VXIplug&play online help

under “Introduction to Programming”.

Introduction to Programming - 6

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.

( 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 in Appendix A.

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 address can be set from 0 to 30. The GPIB address is stored in non-volatile memory.

ADDRESS <value> Enter a value to set the GPIB Address

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.

6 - Introduction to Pr ogramming

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Types of SCPI Commands

SCPI has two types of commands, common and subsystem. ♦ Common commands generally are not related to specific operation but to controlling overall dc

source functions, such as reset, status, and synchronization. All common commands consist of a three-letter mnemonic 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 8-1.

ROOT

:OUTPut

:STATus

:STATe

:DFI

:PON

:PROTection

:OPERation

:STATe

:SOURce

:STATe

:CLEar :DELa

:EVEN

:CONDition?

Figure 6-1. 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 separator. An example of a message with two commands is:

OUTP:STAT ON;PROT:DEL 2

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 "OUTP" was omitted because after the "OUTP:STAT ON" command, the header path was became defined as "OUTP" and thus the instrument interpreted the second command as:

OUTP:PROT:DEL 2

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

OUTP:OUTP:PROT:DEL 2

which is incorrect.

Introduction to Programming - 6

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 subsystems.

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 do not affect the header path; you may insert them anywhere in the message.

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

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. ♦ A program message consists of one or more properly formatted SCPI commands sent from the

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

♦ A response message consists of data in a specific SCPI format sent from the dc source to the

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

Figure 6-2 illustrates the SCPI 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>

6 - Introduction to Pr ogramming

;

Data

words

VOLT <NL>

word Separator

: LEV 20

e Unit Separators

Messa

e Unit

PROT 21

Indicator

Quer

: CURR?

Messa

Root S

e Terminator

ecifier

Figure 6-2. Command Message Structure

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.

Introduction to Programming - 6

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

<NR1>

<NR2> Digits with an explicit decimal point. Example: .0273 <NR3> Digits with an explicit decimal point and an exponent. Example: 2.73E+2 Parameter Formats <Nrf> Extended format that includes <NR1>, <NR2> and <NR3>. Examples: 273 273. 2.73E2 <Nrf+> Expanded decimal format that includes <NRf> and MIN MAX. Examples: 273 273.

<Bool> Boolean Data. Example: 0 | 1 or ON | OFF

Response Formats

Digits with an implied decimal point assumed at the right of the least-significant digit. Examples: 273

2.73E2 MAX. MIN and MAX are the minimum and maximum limit values that are implicit in the range specification for the parameter.

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 following forms, depending on the length of the returned string:

<SRD>

Character Response Data. Permits the return of character strings. Arbitrary ASCII Response Data. Permits the return of undelimited 7-bit ASCII. This data

type has an implied message terminator. String Response Data. Returns string parameters enclosed in double quotes.

6 - Introduction to Pr ogramming

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 8. Some practical considerations for using these commands are as follows:

*WAI

*OPC?

*OPC

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

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.

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 Agilent BASIC:

CLEAR 705 IEEE-488 Device Clear

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

IOCLEAR (705)

Introduction to Programming - 6

SCPI Conformance Information

SCPI Conformed Commands

The Agilent 66321B/D and 66319B/D conform to SCPI Version 1995.0.

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

Non-SCPI Commands

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

Programming the DC Source

Introduction

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

$ output functions such as voltage, current, and resistance $ internal and external triggers $ measurement functions $ the status and protection functions

NOTE: The 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.

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 STAT:PRES *SRE 0 *ESE 0

*RST is a convenient way to program all parameters to a known state. Refer to the *RST command in chapter 8 to see how each programmable parameter is set by *RST. Refer to the *PSC command in chapter 8 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:

OUTP ON

Note that this command enables both outputs on Agilent 66319B/66319D units.

Output Voltage

The output voltage is controlled with the VOLTage command. To set the output voltage to 5 volts, use:

VOLT 5 or VOLT2 5 for models that have a second output

7 - Programming the DC Source

Maximum Voltage

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

VOLT? MAX

Overvoltage Protection

The dc source will turn off its output if the output voltage exceeds its programmed setting by two volts when measured at the + sense and − sense terminals. If the operation of the overvoltage protection circuit interferes with the proper operation of your phone test, you can disable overvoltage protection. As explained in chapter 8, this protection feature is implemented with the following command:

VOLT:PROT:STAT <bool> where <bool> is the voltage protection state (0 | OFF; 1 | ON).

CAUTION: If overvoltage protection is disabled, the dc souce or the equipment under test will not be

protected from excessive external voltages.

Output Current

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

CURR <n> or CURR2 <n> for models that have a second output

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:

CURR? 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 8, this protection feature is implemented the following command:

CURR:PROT:STAT ON | OFF

NOTE: Use the OUTPut:PROTection:DELay command to prevent momentary current limit

conditions caused by programmed output changes from tripping the overcurrent protection.

Output Resistance

The output resistance is controlled with the RESistance command. To set the output resistance to 0.5 ohms, use:

RES 0.5

Programming the DC Source - 7

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Triggering Output Changes

The dc source has two independent trigger systems. One is used for synchronizing output changes, and the other is used for synchronizing 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 Model

Figure 7-1 is a model of the output trigger system. The rectangular boxes represent states. Arrows show the transitions between states. These are labeled with the input or event that causes the transition to occur.

BORt

INITiate:CONTinuous OFF

INITiate:CONTinuous ON

IDLE STATE

INITiate

INITIATED STATE

TRIGGER RECEIVED

OUTPUT

LEVEL

CHANGE

:IMMediate

*RST *RCL

Figure 7-1. Model of Output Trigger System

Setting the Voltage, Current, or Resistance Transient 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:

VOLT:TRIG <n> VOLT2:TRIG <n> for models that have a second output

CURR:TRIG <n> CURR2:TRIG <n> for models that have a second output RES:TRIG <n> only applies to output 1 (the main output)

NOTE: Until they are programmed, trigger levels will be the same as the corresponding voltage

or current levels. For example, if a dc source is powered up and the voltage is programmed to 6, the trigger level is also set to 6. Once you program a trigger level, it will stay at that value until the output is changed by a transient trigger or reprogrammed.

7 - Programming the DC Source

Enabling 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 is disabled, ignoring all triggers. Sending the following commands at any time returns the trigger system to the idle state:

ABOR *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:

INIT:SEQ1 or INIT:NAME TRAN

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

To keep the transient trigger system initiated for multiple triggers without having to send an initiate command for each trigger, use:

INIT:CONT:SEQ1 ON or INIT:CONT:NAME TRAN, ON

Selecting the Output Trigger Source

The only trigger source for output triggers is a command from the bus. Since BUS is the only trigger source, the following command is provided for completeness only:

TRIG:SOUR BUS

Generating Triggers

Single Trigger

After you have specified the appropriate trigger source, you can generate triggers by sending one of the following commands over the GPIB:

TRIG:IMM *TRG

an IEEE-488 Group Execute Trigger bus command

When the trigger system enters the Output Change state upon receipt of a trigger (see figure 7-1), the triggered functions are set to their programmed trigger levels. When the triggered actions are completed, the trigger system returns to the idle state.

NOTE: The external trigger input port does not support output triggers.

Multiple Triggers

When you have programmed INITiate:CONTinuous:SEQuence1 ON as previously discussed, the trigger system does not need to be initiated for each trigger; it responds to the next trigger as soon as it is received. When each triggered action completes, the trigger system returns to the initiated state to wait for the next trigger. INITiate:CONTinuous:SEQuence1 OFF returns the system to single trigger mode.

Programming the DC Source - 7

Making Basic Measurements

All dc sources have excellent output voltage and current measurement capability.

NOTE: There is only one measurement system in the dc source. Therefore, you can perform only

one measurement function (voltage, current, or DVM) at a time.

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. For the main output (output 1), many parameters of the measurement are programmable. These include the number of samples, the time interval between samples, 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.

Average Measurements

To measure the average output voltage or current for the main output (output 1), use:

MEAS:VOLT? MEAS:CURR?

Average voltage and current is measured by acquiring a number of readings at the selected time interval, applying the Hanning window function to the readings, and averaging the readings. Windowing is a signal conditioning process that reduces the error in average measurements made in the presence of periodic signals such as pulse current waveforms, which are generated when TDMA cellular phones are transmitting. The power-on and *RST sample interval and sweep size settings yield a data acquisition time of 32 milliseconds per measurement.

Ripple rejection is a function of the number of cycles of the ripple frequency contained in the acquisition window. More cycles in the acquisition window results in better ripple rejection. If you increase the data acquisition time 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.

Controlling Measurement Samples

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 7-2.

Figure 7-2. Commands that Control Measurement Time

7 - Programming the DC Source

When the instrument is turned on and at *RST, the output voltage or current sampling rate is 15.6 microseconds, and the sweep size is set to 2048 data points. This means that it takes about 32 milliseconds to fill up 2048 data points in the data buffer. Adding a command processing overhead of about 20 milliseconds results in a total measurement time of about 50 milliseconds per measurement. You can vary this data sampling rate with:

SENS:SWE:TINT <sample_period> SENS:SWE:POIN <points>

For example, to set the time interval to 46.8 microseconds per measurement with 1500 samples, use

SENS:SWE:TINT 46.8E-6;POIN 1500.

Note that reducing the number of sample points increases the speed of the measurement; however, the tradeoff is greater measurement uncertainty in the presence of noise..

Window Functions

The dc source lets you select from two measurement window functions: Hanning and Rectangular. To select a window function, use:

SENS:WIND: HANN | RECT

As shipped from the factory, the dc source measurement functions use a Hanning window. The Hanning window applies a cos and rms measurements. This returns accurate data even if an integral number of waveform cycles are not captured, provided that at least three or more waveform cycles are in the measurement buffer. If there are only one or two waveform cycles, the Hanning window will not give accurate results.

With a Rectangular window, no weighting function is applied to the data in the measurement buffer. However, to use the Rectangular window function to return accurate data for one or more waveform cycles, an integral number of waveform cycles must be captured in the measurement buffer. This means that you must accurately know the waveform period beforehand. In this way you can chose the sample interval and the number of data points so that an integral number of waveform cycles will end up in the measurement buffer.

weighting function to the data in the measurement buffer when computing average

Measuring Output 2 Voltage and Current (Agilent 66319B/66319D only)

The measurement parameters for output 2 are not programmable. They are fixed at 2048 data points with a 15.6 microsecond sampling rate using a Hanning window. To measure the average output voltage or current for output 2, use:

MEAS:VOLT2? MEAS:CURR2?

Making Enhanced Measurements

Agilent Models 66321B/D and 66319B/D have the ability to make several types of voltage or current waveform measurements. These expanded measurement capabilities are particularly useful for loads that draw current in pulses. The SCPI language MEASure and FETCh queries are used to return the various measurement parameters of voltage and current waveforms.

Programming the DC Source - 7

There are two ways to make enhanced measurements: ♦ Use the MEASure queries 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. Additional calculations may be obtained from the acquired data using FETCh queries.

♦ Use a triggered measurement when the measurement must be synchronized to a signal condition as

discussed under “Triggering Measurements”. Then use the FETCh queries 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 queries 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 acquired voltage data, you can fetch only voltage calculations.

NOTE: For each MEASure query, there exists a corresponding FETCh query. FETCh queries

perform the same calculation as MEASure queries, but do not acquire new data.

Current Ranges and Measurement Detector

The dc source has three current measurement ranges. The command that controls the ranges is: SENS:CURR:RANG <value> | MIN | MAX

Enter the value of the current that you expect to measure. When the range is set to 3A, the maximum current that can be measured is the maximum rating of the unit. Other current ranges are as follows:

3A Range: 0 through MAX (see Table A-2) 1A Range: 0 through 1 A

0.02A Range: 0 through 0.02 A (MIN)

The dc source also has two measurement detectors. 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.

SENS:CURR:DET ACDC

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.

SENS:CURR:DET DC

RMS Measurements

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

MEAS:VOLT:ACDC? or MEAS:CURR:ACDC?

This returns the ac+dc rms measurement.

Making rms or average 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. If the measurement readings vary from sample to sample, try increasing the data acquisition time to reduce measurement error.

7 - Programming the DC Source

Pulse Measurements

After pulse data has been acquired, use FETCh queries to return measurement data in the shortest time. FETCh queries do not trigger the acquisition of new measurement data, but return different calculations from the data that was acquired. If you acquired voltage data, you can fetch only voltage measurements; if you acquired current data you can fetch only current measurements, otherwise an error will occur.

The dc source has several measurement queries that return key parameters of pulse waveforms as shown in Figure 7-3.

FETC:CURR:MAX?

FETC:VOLT:MAX?

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

FETC:CURR:LOW?

DATA POINTS

Figure 7-3. Measurement Commands Used to Return Pulse Data

FETC:VOLT:LOW?

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

Minimum and Maximum Measurements

To return the maximum or minimum value of a pulse or ac waveform use:

FETC:VOLT:MAX? or FETC:VOLT:MIN? FETC:CURR:MAX? or FETC:CURR:MIN?

High/Low Measurements

The value of the high level or low level of a pulse can also be measured. High and low level measurements are defined as follows: The instrument first measures the minimum and maximum data points of the pulse waveform. It then generates a histogram of the pulse waveform using 16 bins between the maximum and minimum data points. The bin containing the most data points above the 50% point is the high bin. The bin containing the most data points below the 50% point is the low bin. The average of all the data points in the high bin is returned as the High level. The average of all the data points in the low bin is returned as the Low level. If no high or low bin contains more than 1.25% of the total number of acquired points, then the maximum or minimum value is returned by these queries.

To return the average value of the high bin, use:

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

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

FETC:CURR:LOW? or FETC:VOLT:LOW?

Programming the DC Source - 7

Returning All Measurement Data From the Data Buffer

The MEASure:ARRay and FETCh:ARRay queries return all data values of the instantaneous voltage or current buffer. No weighting function is applied, returning only raw data from the buffer. The commands are:

MEAS:ARR:CURR? MEAS:ARR:VOLT?

Making DVM Measurements

Agilent Models 66321D and 66319D have a DVM input on the rear panel for making independent voltage measurements. The common mode voltage range of the DVM is −4.5 V to +25 V from either DVM input with respect to the negative output terminal of output 1. To protect the DVM from damage, keep the maximum isolation voltage to ground at less than ±50 Vdc. To obtain correct voltage measurements, keep the common mode voltage within the specified limits. Refer to chapter 3 under "DVM Connection" for more information.

The DVM can only measure average and rms voltage. Its measurement parameters are not programmable. They are fixed at 2048 data points with a 15.6 microsecond sampling rate using a Hanning window. Use the SCPI language MEASure and FETCh queries to return measurements. Note that all triggered measurement functions discussed the next section also apply to DVM measurements.

NOTE: There is only one measurement system in the dc source. Therefore, you can perform only

one measurement function (voltage, current, or DVM) at a time.

Average Measurements

To measure the average voltage, use:

MEAS:DVM:DC?

Average voltage 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 average measurements made in the presence of periodic signals. The DVM sampling rate and sweep size result in a data acquisition time of 32 milliseconds per measurement. Adding a command processing overhead of about 20 milliseconds results in a total measurement time of about 50 milliseconds per measurement.

RMS Measurements

To measure rms voltage, use: MEAS:DVM:ACDC?

This returns the total rms measurement. If ac and dc are present, the DVM measures the total rms of ac+dc.

7 - Programming the DC Source

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Triggered Measurements

Use the measurement trigger system to synchronize the acquisition of measurements with either a BUS or internal trigger. You can trigger voltage and current measurements on the main output (output 1) and on the DVM. An internal trigger synchronizes the acquisition to a signal condition. Use FETCh commands to return different calculations from the data acquired by the measurement system. Briefly, to make a triggered measurement:

1 Select a sweep interval and sample size 2 Set up the trigger levels 3 Setting the output 2 voltage and current 4 Select the trigger source 5 Enable the trigger system 6 Fetch the triggered measurements

SCPI Triggering Nomenclature

The dc source uses the following sequence name and alias for the measurement trigger system. The alias can be used instead of the sequence form.

Sequence Form Alias

SEQuence2 ACQuire

Measurement Trigger Model

Figure 7-4 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

INITiate

INITIATED STATE

TRIGGER RECEIVED

SENSe:SWEep:POINts

CQUIRED

Figure 7-4. Model of Measurement Trigger System

TRIGger:COUNt

COMPLETE?

YES

:IMMediate

BORt *RST *RCL

Programming the DC Source - 7

Enabling the Measurement Trigger System

When the dc source is turned on, the trigger system is in the idle state. In this state, the trigger system is disabled and it 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 measurement system to receive triggers. To initiate the measurement trigger system, use:

INIT:SEQ2 or INIT:NAME ACQ After a trigger is received and the data acquisition completes, the trigger system will return to the idle

state (unless multiple triggers are desired). Thus it will be necessary to initiate the system each time a triggered measurement is desired.

NOTE: The measurement trigger system cannot be initiated continuously. However, it can be

repeated for a limited number of times as explained under "Multiple triggers".

Selecting the Measurement Trigger Source

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 -

INTernal -

EXTernal -

To select GPIB bus triggers, use: TRIG:SEQ2:SOUR BUS or TRIG:ACQ:SOUR BUS

To select internal triggers use: TRIG:SEQ2:SOUR INT or TRIG:ACQ:SOUR INT

To select external triggers use: TRIG:SEQ2:SOUR EXT or TRIG:ACQ:SOUR EXT

Selects GPIB bus triggers. This synchronizes the measurement to the bus trigger command

Selects the signal as the measurement trigger. This synchronizes the measurement to the signal condition present at either the main output (output1) terminals or the DVM inputs.

Selects the external trigger input as the measurement trigger source. This capability only applies to units with firmware revision A.03.01 and up.

Selecting the Sensing Function

There is only one measurement system in the dc source. The measurement system supports voltage measurements at the main output, current measurements at the main output, and DVM input measurements. Before you generate a measurement trigger, you must specify one of the following measurement functions:

SENS:FUNC "CURR" or SENS:FUNC "VOLT" or

SENS:FUNC "DVM"

7 - Programming the DC Source

Generating Measurement Triggers

Single Triggers

After you specify the appropriate trigger source and sensing function, generate triggers as follows:

GPIB Triggers

Internal Triggers

External Triggers

Trigger occurs on rising edge when signal crosses positive

hysteresis band limit

TRIG:ACQ:LEV:CURR <level>

TRIG:ACQ:LEV:VOLT <level>

TRIG:ACQ:SLOP:CURR POS

TRIG:ACQ:SLOP:VOLT NEG

Figure 7-5. Commands Used to Control Internal Measurement Triggers

Send one of the following commands over the GPIB:

TRIG:IMM (not affected by the trigger source setting) *TRG

an IEEE-488 Group Execute Trigger bus command 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 7-5 for current triggers.

To externally trigger the measurement, you must supply either a negative-going edge signal or a contact closure to the external trigger input (see Appendix A). This capability only applies to units with firmware revision A.03.01 and up.

Trigger occurs on falling edge when signal crosses negative

hysteresis band limit

TRIG:ACQ:HYST:CURR <value> TRIG:ACQ:HYST:VOLT <value>

TRIG:ACQ:SLOP:CURR NEG

TRIG:ACQ:SLOP:VOLT NEG

Measurement time = time interval X number of points

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

TRIG:SEQ2:LEV:CURR <value> or TRIG:ACQ:LEV:CURR <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.

TRIG:SEQ2:SLOP:CURR <slope> or TRIG:ACQ:SLOP:CURR <slope>

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

TRIG:SEQ2:HYST:CURR <value> or TRIG:ACQ:HYST:CURR <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 computer if the trigger condition does not occur immediately.

Programming the DC Source - 7

One way to wait for results without tying up the computer 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 the SRQ interrupts.

Multiple Triggers

As shown in Figure 7-6, the dc source also has the ability to set up several measurements in succession. This is accomplished by specifying a trigger count.

NOTE: Multiple triggers can only be programmed for voltage and current measurements on the

main output (output 1). Multiple triggers cannot be programmed for DVM measurements.

trigger 1 trigger 2 trigger 3

trigger level

Measurement

(Measurement = time interval X # of points)

Measurement

TRIG:ACQ:COUN:VOLT 3 or TRIG:ACQ:COUN:CURR 3

Measurement

Figure 7-6. Multiple Measurements

To set up the trigger system for a number of sequential acquisitions use:

TRIG:ACQ:COUN:CURR <number> or TRIG:ACQ:COUN:VOLT <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 acquisition the instrument will wait for the next valid trigger condition to start another. When all measurements complete, use FETCh commands to return the data.

By varying the measurement parameters, you can accurately measure specific portions of an output pulse. For example, if you set the measurement time to match the pulse width, you can measure just the high level of a specific number of output pulses. If you increase the measurement time to include the entire waveform, you will return measurement data based on the entire waveform. To calculate the correct time interval for your measurement, simply divide the desired measurement time by the number of points or samples in the measurement.

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

multiplied by the points in each measurement cannot exceed 4096; otherwise an error will occur.

7 - Programming the DC Source

Pre-trigger and Post-trigger Data Acquisition

The measurement system lets you capture data before, after, or at the trigger signal. When a measurement is initiated, the dc source continuously samples the instantaneous signal level of the sensing function. As shown in figure 7-7, you can move the block of data being read into the acquisition buffer with reference to the acquisition trigger. This permits pre-trigger or post-trigger data sampling.

OFFSET = -4095

4096 DATA POINTS

OFFSET = -2048

4096 DATA POINTS

OFFSET = 0

4096 DATA POINTS

TIME

OFFSET = 0 to 2

CQUISITION

TRIGGER

4096 DATA POINTS

Figure 7-7. Pre-trigger and Post-trigger Acquisition

To offset the beginning of the acquisition buffer relative to the acquisition trigger, use: SENS:SWE:OFFS:POIN <offset>

The range for the offset is -4095 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).

NOTE: If, during a pre-trigger data acquisition, a trigger occurs before the pre-trigger data count

is completed, the measurement system ignores this trigger. This will prevent the completion of the measurement if another trigger is not generated.

Programming the Status Registers

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

Figure 7-8 shows the status register structure of the dc source. Table 7-1 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 IEEE 488.2 Standard Digital Interface for Programmable Instrumentation. The Operation Status and Questionable Status registers implement functions that are specific to the dc source.

Programming the DC Source - 7

Power-On Conditions

Refer to the *RST command description in chapter 8 for the power-on conditions of the status registers.

QUESTIONABLE STATUS

N.U.

FP OT OS

N.U.

UNR2

UNR N.U.

OC2

N.U.

OVLD

N.U.

OPC N.U. QYE DDE EXE CME N.U.

PON

CAL

N.U.

WTG

N.U.

CV CV2 CC+ CCCC2 N.U.

CONDITION

8888

6-7 8 9

512

1024 11 12

4096 13

14 15

STANDARD EVENT STATUS

EVENT ENABLE

1 2

6 7

128

CONDITION

1-4

6,7

256

512

1024

2048

4096 4096 4096 4096

13-15

PTR/NTR

16 32 32 32

256 256 256256 512

1024

4096 4096 4096

16384 16384 1638416384

16 32

128

EVENT

1 2

4 8

1 2

512

1024

LOGICAL OR

OPERATION STATUS

PTR/NTR

512 1024 2048

256

EVENT

256

512 1024 2048

Figure 7-8. DC Source Status Model

ENABLE

1 2

512

1024

OUTPUT QUEUE

DATA

ENABLE

256

512 1024 2048

LOGICAL OR

QUEUE

NOT

EMPTY

OFF

N.U.

QUES

MAV

ESB MSS

OPER

OUTPut:DFI :SOURce

STATUS BYTE

0-2

128

RQS

SERVICE REQUEST

GENERATION

SERVICE

REQUEST

ENABLE

128

LOGICAL OR

FIG4-6.GAL

FLT

7 - Programming the DC Source

Table 7-1. Bit Configurations of Status Registers

Bit Signal Meaning

0 5 8 9 10 11 12

0 1 3 4 5 8 9 10 12 14

0 2 3 4 5 7

3 4 5 6

CAL WTG CV CV2 CC+ CCCC2

OV OCP FP OT OS UNR2 RI UNR OC2 MeasOvld

OPC QYE DDE EXE CME PON

QUES MAV ESB MSS RQS OPER

Operation Status Group The dc sour ce is computing new calibra tion constants The dc source is waiting for a trigger The dc sour ce is in constant volta ge mode Output 2 is operating in constant voltage mode The dc source is in constant current mode The dc sour ce is in negative consta nt current mode Output 2 is operating in constant current mode Questionable Status Group The overvoltage protection has tripped The overcurrent protection has tripped A front panel key has been depressed while in local mode The overtemperature protection has tripped An open sense lead has been detected Output 2 is unre gul ated The remote inhibit state is active The output i s unregulated Output 2 overcurrent protection has tripped 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

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 OPERation summary bit (7) of the Status Byte register.

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 transition filter that functions as described under STAT:OPER:NTR|PTR commands in chapter 8. It is a read/write register. A negative transition filter that functions as described under STAT:OPER:NTR|PTR commands in chapter 8. It is a read/write register. A register that latches any condition tha t 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.

Programming the DC Source - 7

Questionable Status Group

The Questionable Status registers record signals that indicate abnormal operation of the dc source. As shown in figure 7-7, 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.

Condition

PTR Filter

NTR Filter

Event

Enable

STAT:QUES:COND?

STAT:QUES:PTR <n>

STAT:QUES:NTR <n>

STAT:QUES:EVEN?

STAT:QUES:ENAB <n>

A register that holds real-time status of the circuits being monitored. It is a read-only register. A positive transition filter that functions as described under STAT:QUES:NTR|PTR commands in chapter 8. It is a read/write register.

A negative transition filter that functions as described under STAT:QUES:NTR|PTR commands in chapter 8. It is a read/write register. A register that latches any condition tha t 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..

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 7-7). 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?

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.

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

Status Byte Register

This register summarizes the information from all other status groups as defined in the IEEE 488.2 Standard Digital Interface for Programmable Instrumentation. See Table 7-1 for the bit configuration.

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.

7 - Programming the DC Source

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:

STAT:QUES:EVEN? STAT:OPER:EVEN? 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 7-7, 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:

Programming the DC Source - 7

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:

STAT:OPER:PTR 1024;ENAB 1024

Step 2

Step 3

Step 4

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 event to be summed into the Questionable summary bit. Use: STAT:QUES:PTR 19;ENAB 19 (1 + 2 + 16 = 19)

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:

STAT:OPER:EVEN;QUES:EVEN?

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:

STAT:OPER:PTR 1024;NTR 1024 STAT:OPER:ENAB 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:EVENt?, 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 A-2 for the electrical parameters. Refer to Appendix E for a programming example.

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 disable the dc source output. To select an operating modes for the remote inhibit signal, use:

OUTP:RI:MODE LATC | LIVE | OFF

7 - Programming the DC Source

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

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 pin assignments of the mating plug when used in RI/DFI mode as well as Digital I/O mode. Refer to Table A-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 pro grammable

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.

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 6, which explains the terms, symbols, and syntactical structures used here and gives an introduction to programming. You should also be familiar with chapter 5, 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

Parameters

Related Commands

Order of Presentation

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.

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 Appendix A.

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, display, measurement, output, status, system, trigger, and common commands. Both the subsystem commands and the common commands that follow are arranged in alphabetical order under each heading.

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 arranged according to function: Calibration, Display, 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 8-1 lists all of the subsystem commands in alphabetical order.

8 – Language Dictionary

Table 8-1. Subsystem Commands Syntax

ABORt CALibrate

:CURRent [:SOURce] [:DC] [:POSitive] :MEASure [:DC] :R3 :LOWRange :AC :CURRent2 :DATE <date> :DVM :LEVel <level> :PASSword <n> :RESistance :SAVE :STATE <bool> [,<n>] :VOLTage [:DC] :VOLTage2

DISPlay [:WINDow] [:STATe] <bool> :CHANnel <n> :MODE <mode> :TEXT [:DATA] <string>

FORMat [:DATA] <type> :BORDer <type>

INITiate [:IMMediate] :SEQuence[<n>] :NAME <name> CONTinuous :SEQuence1, <bool> :NAME TRANsient, <bool>

INSTrument :COUPle :OUTPut :STATe <state>

MEASure :CURRent2? :VOLTage2?

MEASure | FETCh :ARRay :CURRent [:DC]? :VOLTage [:DC]? [:SCALar] :CURRent [:DC]? :ACDC? :HIGH? :LOW? :MAX? :MIN?

Resets the trigger system to the Idle state

Calibrate positive output current and high current measurement range

Calibrate middle current measurement range Calibrate low current measurement range Calibrate ac current measurement circuits Calibrate output2 current Sets and reads the calibration date Calibrate DVM voltage readback Advance to next calibration step (P1 | P2) Set calibration password Calibrate output resistance Save new cal constants in non-volatile memory Enable or disable calibration mode Calibrate output voltage and voltage readback Calibrate output2 voltage

Enable/disable front panel display Select the output that is displayed ( 1 | 2) Set display mode (NORM | TEXT) Sets the text that is displayed

Specifies data type and length for all array queries Specifies byte order for all array queries

Enable the numbered trigger system sequence (1 | 2) Enable the named trigger system sequence (TRAN | ACQ)

Enable continuous output transient triggers Enable continuous output transient triggers

Couples or decouples output 1 and output 2 (NONE or ALL)

Returns the output 2 current measurement Returns the output 2 voltage measurement

Returns the digitized instantaneous current Returns the digitized instantaneous voltage

Returns dc current Returns the total rms current (ac+dc) Returns the HIGH level of a current pulse Returns the LOW level of a current pulse Returns maximum cur rent Returns minimum current

Table 8-1. Subsystem Commands Syntax (continued)

:DVM [:DC]? :ACDC? :VOLTage [:DC]? :ACDC? :HIGH? :LOW? :MAX? :MIN? OUTPut[1|2] [:STATe] <bool> :COMPensation :MODE <mode> :DFI [:STATe] <bool> :SOURce <source> :PON :STATe <state> :PROTection :CLEar :DELay <n> :RELay:

:MODE <mode> :RI :MODE <mode> SENSe :CURRent [:DC] :RANGe [:UPPer] <n> :DETector <detector> :FUNCtion <function> :LEAD :STATus? :PROTection :STATe <state> :SWEep :OFFSet :POINts <n> :POINts <n> :TINTerval <n> :WINDow [:TYPE] <type> [SOURce:] CURRent [:LEVel] [:IMMediate][:AMPLitude] <n> :TRIGgered [:AMPLitude] <n> :PROTection :STATe <bool> CURRent2 [:LEVel] [:IMMediate][:AMPLitude] <n> :TRIGgered [:AMPLitude] <n> DIGital :DATA [:VALue] <n> :FUNCtion <function> RESistance [:LEVel] [:IMMediate][:AMPLitude] <n> :TRIGgered [:AMPLitude] <n> VOLTage [:LEVel] [:IMMediate][:AMPLitude] <n> :TRIGgered [:AMPLitude] <n>

Language Dictionary - 8

Returns DVM dc voltage measurement Returns DVM rms voltage measurement Returns dc voltage Returns the total rms voltage (ac+dc) Returns the HIGH level of a voltage pulse Returns the LOW level of a voltage pulse Retu rns maximum voltage Retu rns minimum voltage

Enables/disables the dc source output

Sets output compensation

Enables/disables the DFI output Selects event source (QUES | OPER | ESB | RQS | OFF)

Set power-on state (*RST | RCL0)

Reset latched protection Delay after programming/before protection

Specifies the output relay mode (DD, HD, DH, or HH).

Sets remote inhibit operating mode (LATC | LIVE | OFF)

Selects the high current measurement range Selects the current measurement detector (ACDC | DC) Configures the measurement sensor ("VOLT" | "CURR" | "DVM")

Returns the setting of the open sense detection circuit

Enables/disables open sense lead detection

Defines the pre/post data capture in the measurement Define the number of data points in the measurement Sets the digitizer sample spacing Sets the measurement window function (HANN | RECT)

Sets the output current limit Sets the triggered output current limit

Enables/disables current limit protection

Sets the output2 current level Sets the triggered output2 current level

Sets and reads the digital control port Configures digital control port (RIDF | DIG | TRIG)

Sets the output resistance Sets the triggered output resistance

Sets the output voltage level Sets the triggered output voltage level

(HREMOTE | LREMOTE | HLOCAL | LLOCAL)

8 – Language Dictionary

Table 8-1. Subsystem Commands Syntax (continued)

:PROTection

[:LEVel] <n>

:STATe <bool> VOLTage2 [:LEVel] [:IMMediate][:AMPLitude] <n> :TRIGgered [:AMPLitude] <n>

STATus :PRESet :OPERation [:EVENt]? :CONDition? :ENABle <n> :NTRansition<n> :PTRansition<n> :QUEStionable [:EVENt]? :CONDition? :ENABle <n> :NTRansition<n> :PTRansition<n>

SYSTem :ERRor? :LANGuage <language> :VERSion?

TRIGger :SEQuence2 | :ACQuire [:IMMediate] :COUNt :CURRent <n> :DVM <n> :VOLTage <n> :HYSTeresis :CURRent <n> :DVM <n> :VOLTage <n> :LEVel :CURRent <n> :DVM <n> :VOLTage <n> :SLOPe :CURRent <slope> :DVM <slope> :VOLTage <slope> :SOURce <source> [:SEQuence1 | :TRANsient] [:IMMediate] :SOURce <source> :SEQuence1 :DEFine TRANsient :SEQuence2 :DEFine ACQuire

Sets the programmable output voltage limit

Enables/disables automatic overvoltage protection tracking

Sets the output2 voltage level Sets the triggered output2 voltage level

Presets all enable and transition registers to power-on

Returns the value of the event register Returns the value of the condition register Enables specific bits in the Event register Sets the Negative transition filter Sets the Positive transition filter

Returns the error number and error string Sets the programming language (SCPI) Returns the SCPI ver sion number

Triggers the measurement immediately

Sets the number of sweeps per current measurement Sets the number of sweeps per DVM measurement Sets the number of sweeps per voltage measurement

Qualifies the trigger when measuring current Qualifies the trigger when making DVM measurements Qualifies the trigger when measuring voltage

Sets the trigger level for measuring current Sets the trigger level when making DVM measurements Sets the trigger level for measuring voltage

Sets the triggered current slope (POS | NEG | EITH) Sets the triggered DVM measurement slope (POS | NEG | EITH) Sets the triggered voltage slope (POS | NEG | EITH) Sets the trigger source (BUS | INT | TRIG)

Triggers the output immediately Sets the trigger source (BUS)

Sets or queries the SEQ1 name

Sets or queries the SEQ2 name

Language Dictionary - 8

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 the chapter. The dc source responds to the following common commands:

Table 8-2. Common Commands Syntax

*CLS *ESE <n> *ESE? *ESR? *IDN? *OPC *OPC? *OPT? *PSC <bool> *PSC? *RCL <n> *RST *SAV <n> *SRE <n> *SRE? *STB? *TRG *TST? *WAI

Clear status Standard event status enable Return standard event status enable Return event status register Return instrument identification Enable "operation complete" bit in ESR Return a "1" when operation complete Return option number Power-on status clear state set/reset Return power-on status clear state Recall instrument state Reset Save instrument state Set service request enable register Return service request enable register Return status byte Trigger Perform selftest, then return result Hold off bus until all device commands done

Programming Parameters

The following table lists the output programming parameters.

Table 8-3. Output Programming Parameters

Parameter Value

[SOUR:]CURR[:LEV][:IMM] and [SOUR:]CURR[:LEV]:TRIG [SOUR:]CURR2[:LEV][:IMM] and [SOUR:]CURR2[:LEV]:TRIG *RST Current Value 10% of MAXimum value [SOUR:]VOLT[:LEV][:IMM] and [SOUR:]VOLT[:LEV]:TRIG [SOUR:]VOLT:PROT[:LEV]

[SOUR:]VOLT2[:LEV][:IMM] and [SOUR:]VOLT2[:LEV]:TRIG

*RST Voltage Value 0 V [SOUR:]RES[:LEV][:IMM] and [SOUR:]RES[:LEV]:TRIG *RST Resistance Value OUTP:PROT:DEL *RST Protection Delay Value 0.08 seconds SENS:CURR:RANG

*RST Current Range Value MAXimum

0 − 3.0712 A

0 − 1.52 A

0 − 15.535 V

0 − 22 V

0 − 12.25 V

−40 mΩ − 1 Ω 0 Ω

0 − 2,147,483.647

0.02A range = 0 − 20 mA 1A range = 20 mA − 1 A

3A range = 1 A − MAX

8 – Language Dictionary

Calibration Commands

Calibration commands let you enable and disable the calibration mode, change the calibration password, calibrate current and voltage programming, 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. You must also save any changes that you made using CALibrate:SAVE, otherwise all changes will be lost when you exit calibration mode.

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:CURRent2

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

CAL:STAT 1, ! enable calibration CAL:CURR, ! start current calibration

CAL:CURR:NEG, CAL:LEV, CAL:DATA

Agilent 66319B/D only

This command initiates the current calibration of output 2.

Command Syntax

Parameters

Examples

Related Commands

CALibrate:CURRent2 None

CAL:CURR2

CAL:CURR:NEG, CAL:LEV, CAL:DATA

CALibrate:CURRent:MEASure:R3

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

Command Syntax

Parameters

Examples

Related Commands

CALibrate:CURRent:MEASure:R3 None

CAL:CURR:MEAS:R3

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

Language Dictionary - 8

CALibrate:CURRent:MEASure:AC

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

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:DATE

Use this command to store the date that the unit was last calibrated. You can enter any ASCII string up to 10 characters.

Command Syntax

Parameters

Examples

Query Syntax

Returned Parameters

CALibrate:DATE <date> <date>

CAL:DATE "3/22/99" CAL:DATE "22.3.99"

CALibrate:DATE? <SRD>

CALibrate:DVM

Agilent 66321D/66319D only

This command initiates the calibration of the DVM.

Command Syntax

Parameters

Examples

CALibrate:DVM None

CAL:DVM

CALibrate:LEVel

This command selects the next point in the calibration sequence. P1 is the first calibration point, P2 is 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:SAV

8 – Language Dictionary

CALibrate:RESistance

This command calibrates initiates the calibration of the output resistance circuit.

Command Syntax

Parameters

Examples

CALibrate:RESistance None

CAL:RES

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

CALibrate:STATe

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

The first parameter specifies the enabled or disabled state. The second parameter is the password. A password 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:VOLTage2

Agilent 66319B/D only

This command initiates the voltage calibration of output 2.

Command Syntax

Parameters

Examples

CALibrate:VOLTage2 None

CAL:VOLT2

Language Dictionary - 8

Display Commands

Display commands control the front panel display of the dc source. Annunciators are not affected.

DISPlay

This command turns the front panel display on or off. When off, the front panel display is blank.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

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

DISP ON DISPLAY:STATE ON DISPlay[:WINDow][STATe]?

<NR1> 0 or 1

DISPlay:CHANnel

Agilent 66319B/D only

Selects the output channel that will be displayed on the front panel. When output 1 is selected, a small "1" appears in the left-most digit. . When output 2 is selected, a small "2" appears in the left-most digit.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

DISPlay:CHANnel <channel> 1 | 2 1

DISPLAY:CHANNEL 2

DISPlay:CHANnel? <NR1> 0 or 1

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

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

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

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

DISP:TEXT "DEFAULT_MODE"

DISPlay[:WINDow]:TEXT? <STR> (Last programmed text string)

8 – Language Dictionary

Measurement Commands

Measurement commands consist of format, measure, and sense commands. Format commands specify the data formatting of all array queries. You can specify the data type, type

length, and byte order. Measure commands measure the output voltage or current. Measurements are performed by digitizing

the instantaneous output voltage or current for a specified number of samples, storing the results in a buffer, and calculating the measured result. Two types of measurement commands are available: MEASure and FETCh. MEASure commands trigger the acquisition of new data before returning the reading. Measurement overflows return a reading of 9.91E+37. FETCh commands return 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 dc source, and the data acquisition sequence.

FORMat

This command selects the data type and the type length for all array queries. Supported types are ASCII and REAL. When ASCII is selected, the response format for these queries is NR3 Numeric Response Data. This format is selected at *RST. The only valid argument for <length> is 0, which means that the dc source selects the number of significant digits to be returned.

When REAL is selected, the array response format is Definite Length Arbitrary Block Response Data. The data within the Arbitrary Block is coded as IEEE single precision floating point, with 4 bytes per value. The second argument to the FORMat:DATA command specifies the number of bits in the returned data. Only the value 32 is permitted in dc source instruments. The byte order within a single value is determined by the FORMat:BORDer command. Definite Length Arbitrary Block Response Data format begins with a header that describes the number of data bytes in the response. The header begins with a pound sign, followed by a single non-zero digit that defines the number of digits in the block length, followed by the digits contained in the block.

For example: The response to the query "MEAS:ARR:CURR:[DC]? 1" which returns 45 numeric values would be as follows:

Command Syntax

Returned Parameters

Related Commands

'#' '3' '1' '8' '0' <byte1> <byte2> ... <byte180> <newline>

FORMat[:DATA] <type> [,length]

Parameters

*RST Value

Examples

Query Syntax

ASCii | REAL ASCii FORM REAL FORMat? <CRD> FORM:BORD MEAS:ARR:CURR:DC? MEAS:ARR:VOLT:DC?

100

Agilent Technologies 66321b, 66319b, 66319D User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Warranty Information

Safety Summary

Declaration Page

Acoustic Noise Information

Printing History

Table of Contents

The Front Panel - At a Glance

The Rear Panel - At a Glance

Instrument Configuration

Use the front panel Address key to configure the interface

Front Panel Number Entry

Use the arrow keys and knob to change voltage or current settings

Use the Function keys and knob to change the displayed settings

Use the arrow keys to edit individual digits in the displayed setting

Front Panel Annunciators

Immediate Action Keys

Front Panel Menus - At a Glance

SCPI Programming Commands - At a Glance

Document Orientation

Safety Considerations

Options and Accessories

Description and Model Differences

Agilent 66321B

Agilent 66319B

Agilent 66321D and 66319D

Common Features

Front Panel Controls

Remote Programming

Output 1 Characteristic

Programmable Output Resistance

Output 2 Characteristic

Option 521 Description (Agilent 66319B/D only)

Installation and Operation Checklist

Inspection

Damage

Packaging Material

Items Supplied

Cleaning

Location

Bench Operation

Rack Mounting

Input Connections

Connect the Power Cord

Output Connections

Output 1

Output 2

Current Ratings

Voltage Drops and Lead Resistance

Remote Sense Connections

Load Regulation and Voltage Drop in the Remote Sense Leads

Maintaining Stability while Remote Sensing

Open Sense Lead Protection

Local Sensing

Output Compensation

OVP Considerations

Programmable Voltage Protection

DVM Connections

Measuring Circuits that are Not Powered by the Main Output

Measuring Circuits that are Floating with Respect to the Main Output

External Protection and Trigger Input Connections

Digital I/O Connections

Computer Connections

GPIB Interface

Checkout Procedure

In Case of Trouble

Selftest Error Messages

Runtime Error Messages

Line Fuse

Introduction

Front Panel Description

System Keys

Function Keys

Immediate Action Keys

Scrolling Keys

Metering Keys

Output Control Keys