Agilent 6634B Operations Guide

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USER’S GUIDE

Dynamic Measurement DC Source

Agilent Model 66332A

System DC Power Supply

Agilent Model 6631B, 6632B, 6633B, 6634B

Agilent Part No. 5962-8196

Microfiche Part No. 5962-8197

Printed in USA: August 2000

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 software and firmware products, which are designated by Agilent 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. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned to Agilent for warranty service. Except for products returned to Customer from another country, Agilent shall pay for return of products to Customer.

Warranty services outside the country of initial purchase are included in Agilent’s product price, only if Customer pays Agilent 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.

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 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’s 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 safet standards of design, manufacture, and intended use of the instrument. Agilent Technologies assumes no liabilit

or 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 connected to the ac power mains through 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.

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

WARNING

Caution

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.

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 si 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 si 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.

n denotes a hazard. It calls attention to a procedure, practice, or the like,

n denotes a hazard. It calls attention to an operating procedure, or the like,

DECLARATION OF CONFORMITY

According to ISO/IEC Guide 22 and CEN/CENELEC EN 45014

Manufacturer’s Name and Address

Responsible Party Alternate Manufacturing Site Agilent Technologies, Inc. Agilent Technologies (Malaysia) Sdn. Bhd 550 Clark Drive, Suite 101 Budd Lake, New Jersey 07828 USA

Declares under sole responsibility that the product as originally delivered

Product Names a) Mobile Communications DC Source

b) System DC Power Supply

Model Numbers a) 66332A, 66312A, 66311B, 66311D

66309B, 66309D, 66319B, 66319D, 66321B, 66321D b) 6631B, 6632B, 6633B, 6634B 6611C 6612C, 6613C, 6614C

Product Options This declaration covers all options and customized products based on

the above products.

Complies with the essential requirements of the Low Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC (including 93/68/EEC) and carries the CE Marking accordingly.

EMC Information

ISM Group 1 Class A Emissions

Malaysia Manufacturing Bayan Lepas Free Industrial Zone, PH III 11900 Penang, Malaysia

As detailed in Electromagnetic Compatibility (EMC), Certificate of Conformance Number

CC/TCF/00/030 based on Technical Construction File (TCF) HPNJ8, dated Apr. 25, 2000

Assessed by: Celestica Ltd, Appointed Competent Body

Westfields House, West Avenue Kidsgrove, Stoke-on-Trent Straffordshire, ST7 1TL United Kingdom

Safety Information and Conforms to the following safety standards.

This DoC applies to above-listed products placed on the EU market after:

January 1, 2004 Date Bill Darcy/ Regulations Manager

For further information, please contact your local Agilent Technologies sales office, agent or distributor, or

Agilent Technologies Deutschland GmbH, Herrenberger Straβe 130, D71034 Böblingen, Germany

IEC 61010-1:2001 / EN 61010-1:2001 Canada: CSA C22.2 No. 1010.1:1992 UL 61010B-1: 2003

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.

Update 1 __________July, 1999 Update 2 __________January, 2000 Update 3 __________August, 2000

Warranty Information 2 Safety Summary 3 Acoustic Noise Information 6 Printing History 6 Table of Contents 7

QUICK REFERENCE 9

Agilent 66332A Dynamic Measurement DC Source and Agilent 6611C-6614C System DC Power Supply 9 The Front Panel - At a Glance 10 Front Panel Number Entry 11 Front Panel Annunciators 12 Immediate Action Keys 12 Front Panel Menus - At a Glance 13 SCPI Programming Commands - At a Glance 14 The Rear Panel - At a Glance 15

GENERAL INFORMATION 17

Document Orientation 17 Safety Considerations 18 Options and Accessories 18 Description 19

Capabilities 19 Front Panel Controls 19 Remote Programming 19 Output Characteristic 20

INSTALLATION 21

Inspection 21

Damage 21 Packaging Material 21 Items Supplied 21 Cleaning 21

Location 22

Bench Operatio n 22 Rack Mounting 22

Input Connections 23

Connect the Power Cord 23

Output Connections 23

Wire Considerations 23 Current Ratings 23 Voltage Drops 24 Multiple Load Connections 24

Remote Sense Connections 25

Sense Leads 25 Stability 26

OVP Considerations 26 Fast/Normal Operation 27

Inductive Loading 27 Capacitive Loading 27

INH/FLT Connections 28 Controller Connections 30

GPIB Interface 30 RS-232 Interface 30

TURN-ON CHECKOUT 31

Introduction 31 Using the Keypad 31 Checkout Procedure 31 In Case of Trouble 34

Error Messages 34 Line Fuse 34

FRONT PANEL OPERATION 35

Introduction 35 Front Panel Description 35 System Keys 37 Function Keys 38

Immediate Action Keys 38 Scrolling Keys 38 Metering Keys 39 Output Control Keys 40

Entry Keys 41 Examples of Front Panel Programming 42

1 - Setting the Output Voltage and Current 42 2 - Querying and Clearing Output Protection 43 3 - Making Front Panel Measurements 43 4 - Programming the Digital Output Port 45 5 - Programming the Output Relay (option 760 only) 46 6 - Setting the GPIB Address and RS-232 Parameters 46 7 - Saving and Recalling Operating States 47

SPECIFICATIONS 49

Specifications 49 Supplemental Characteristics 49

VERIFICATION AND CALIBRATION 53

Introduction 53

Equipment Required 53 Test Setup 53

Performing the Verification Tests 54

Turn-On Checkout 54 Voltage Programming and Measurement Accuracy 55 Current Programming and Measurement Accuracy 55

Performing the Calibration Procedure 59

Front Panel Calibration Menu 59 Front Panel Calibration 59

Calibration Error Messages 62 Changing the Calibration Password 62 Calibration Over the GPIB 63

ERROR MESSAGES 65 LINE VOLTAGE CONVERSION 69

Open the Unit 69 Configure the Power Transformer 69 Install the Correct Line Fuse 69 Close the Unit 70

INDEX 71

Quick Reference

Agilent 66332A Dynamic Measurement DC Source and Agilent 6631B/6632B/6633B/6634B System DC Power Supplies

The Agilent 66332A is a 100 Watt, high performance dc power supply that provides dynamic measurement and analysis of voltage and current waveforms. It is designed to simplify the testing of digital cellular and mobile phones. For example, data acquired using its dynamic measurement capability can be used in determining the battery operating time of digital wireless communications products.

The Agilent 6631B/6632B/6633B/6634B are 100 Watt, high performance dc power supplies with output current measurement capability in the microampere range. They are well suited for testing portable battery-powered products.

Additionally, the combination of bench-top and system features in these dc sources provide versatile solutions for your design and test requirements.

Convenient bench-top features

♦ Up to 100 Watts output power ♦ Easy to use knob for voltage and current settings ♦ Highly visible vacuum-fluorescent front panel display ♦ Excellent load and line regulation; low ripple and noise ♦ Measurement capability down to microampere levels ♦ Current sinking up to the maximum rated output current ♦ Instrument state storage ♦ Portable case

Flexible system features

♦ GPIB (IEEE-488) and RS-232 interfaces are standard ♦ SCPI (Standard Commands for Programmable Instruments) compatibility ♦ Triggered acquisition of digitized output current and voltage waveforms (Agilent 66332A only) ♦ I/O setup easily done from the front panel

1 – Quick Reference

The Front Panel - At a Glance

j14-character display

shows output measurements and programmed values.

1 2 3

Dynamic Measurement DC Source

Unr Dis OCP

CV CC

0-20V / 02A

Prot

Cal Shift Rmt Addr Err SRQ

66XXA

LINE

Off

kAnnunciators

indicate operating modes and status conditions.

lRotary control

sets voltage, current, and menu parameters.

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

SYSTEM

FUNCTION

Input

Local

Meter

Error

Voltage

Address

Save

OCP Current

Recall

Cal Output

Shift

Prot Clear

Protect

Output

on/off

mOptional front

panel output connectors.

ÊÉ

ENTRY

Clear

Enter

Entry

Back space

OUTPUT

240 VDC Max

nTurns the dc source

on and off.

o System keys:

♦ return to Local

mode

♦ set the GPIB

address

♦ set the RS-232

interface

♦ display SCPI

error codes

♦ save and recall

instrument states.

6 7 8

p Function keys:

♦ enable/disable

output

♦ select metering

functions

♦ program voltage

and current

♦ set and clear

protection functions

♦ and

scroll through the front panel menu commands.

ô

qEntry keys:

♦ enter values ♦ increment or

decrement values

♦ and

select front panel menu parameters.

♦ and

select a digit in the numeric entry field.

ËÌ

Quick Reference – 1

Front Panel Number Entry

Enter numbers from the front panel using one of 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.

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

The output is operating in constant voltage mode. The output is operating in constant current mode. The output 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 selected Remote programming interface (either GPIB or

RS-232) 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 On/Off

Local

Prot ClrShift

OCPShift

A toggle switch that turns the output of the dc source on or off.

Activates front panel control when the unit is in remote mode (unless a Lockout command is in effect).

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

A toggle switch that enables or disables overcurrent protection.

Front Panel Menus - At a Glance

Quick Reference – 1

Address

Recall

Meter

ADDRESS 7 Sets the GPIB Address

ô ô ô ô ô

INTF GPIB Selects an interface (GPIB or RS232) BAUDRATE 300 Selects baud rate (300, 600, 1200, 2400, 4800, 9600) PARITY NONE Selects message parity (NONE, EVEN, ODD, MARK, SPACE) FLOW NONE Selects flow control (XON-XOFF, RTS-CTS, DTR-DSR, NONE) LANG SCPI Selects language (SCPI or COMP)

*RCL 0 Recalls instrument state

SaveShift ErrorShift

*SAV 0 Saves present instrument state ERROR 0 Displays errors in SCPI error queue

12.000V 0.204A Measures output voltage and current

ô ô ô ô ô ô ô ô ô ô

12.500V MAX Measures peak output voltage

1.000V MIN Measures minimum output voltage

12.330V HIGH Measures the high level of a voltage pulse waveform

0.080V LOW Measures the low level of a voltage pulse waveform

12.000V RMS Measures rms voltage

0.350A MAX Measures peak output current

0.050A MIN Measures minimum output current

0.400A HIGH Measures the high level of a current pulse waveform

0.012A LOW Measures the low level of a current pulse waveform

0.210A RMS Measures rms current

Voltage Current Protect Output

ô ô ô ô ô ô ô ô ô

Shift Shift Input

Shift

Use and to select menu parameters. Use to exit any menu and return to metering mode.

Not available on Agilent 6631B - 6634B or in Compatibility mode. 2Not available on Agilent 6631B.

Cal

VOLT 20.000 Sets the output voltage CURR 2.000 Sets the output current OC -- -- -- -- Protection status (example shows overcurrent tripped) *RST Places the dc source in the factory-default state

PON:STATE RST Select the power-on state command (RST or RCL0) PROT:DLY 0.08 Sets the output protection delay in seconds RI LATCHING Sets the remote inhibit mode (LATCHING, LIVE, or OFF) DFI OFF Sets the discrete fault indicator state (ON or OFF) DFI:SOUR OFF Selects the DFI source (QUES, OPER, ESB, RQS, or OFF) PORT RIDFI Sets the output port functions (RIDFI or DIGIO) DIGIO 7 Sets and reads the I/O port value (0 through 7) RELAY ON Sets the output relay state (ON or OFF)

RELAY NORM Sets the output relay polarity (NORM or REV) VOLT:PROT 22 Sets overvoltage protection level

CURR:RANG HIGH Sets current range (HIGH, LOW, or AUTO) CURR:DET ACDC Sets current measurement detector (ACDC or DC)

CAL ON Accesses calibration menu (See User’s Guide).

ËÌ

Meter

1 – Quick Reference

SCPI Programming Commands - At a Glance

NOTE Some [optional] commands have been omitted for clarity. Refer to the Programming

Guide for a complete description of all programming commands.

ABORt SENSe CALibrate :CURRent :RANGe <n>

:CURRent [:SOURce] [:POSitive] :DETector ACDC | DC :NEGative :FUNCtion “VOLT” | “CURR” :MEASure :LOWRange :SWEep :OFFSet :POINts <n> :AC

:POINts <n> :DATA <n> :TINTerval <n> :LEVel P1 | P2 | P3 | P4 :WINDow HANN | RECT :PASSword <n> [SOURce:] :SAVE CURRent [:LEVel] [:IMMediate] <n> :STATe <bool> [, <n>] :TRIGgered <n> :VOLTage [:DC] :PROTection :STATe <bool> :PROTection DIGital :DATA <n> DISPlay :FUNCtion RIDF | DIG [:STATe] <bool> VOLTage [:LEVel] [:IMMediate] <n> :MODE NORMal | TEXT :TRIGgered <n> :TEXT <display_string> :ALC :BANDwidth? | :BWIDth? INITiate :PROTection <n> [:IMMediate] :SEQuence[1|2 :NAME TRANsient | ACQuire

] STATus

:PRESet :CONTinuous :SEQuence[1], <bool> :OPERation [:EVENt]? :NAME TRANsient, <bool> :CONDition?

MEASure | FETCh

:ARRay :CURRent? :VOLTage?

:ENABle <n>

:NTRansition <n>

:PTRansition <n> [:SCALar]:CURRent[:DC]? :QUEStionable [:EVENt]? :ACDC? :HIGH? :LOW? :MAX? :MIN?

:CONDition?

:ENABle <n>

:NTRansition <n>

:PTRansition <n>

SYSTem :VOLTage [:DC]? :ERRor? :ACDC? :HIGH? :LOW? :MAX? :MIN?

:LANGuage SCPI | COMPatibility

:VERSion?

:LOCal

:REMote

:RWLock

OUTPut TRIGger

:VOLTage <n>1

:SLOPe :CURRent POS | NEG | EITH1 :VOLTage POS | NEG | EITH1

:SOURce BUS | INTernal1 [:SEQuence1 | :TRANsient] [:IMMediate]

Not available on Agilent 6631B - 6634B :SOURce BUS

Fetch commands not available on Agilent 6631B – 6634B :SEQuence1 :DEFine TRANsient

Not available on Agilent 6631B

:SEQuence2 :DEFine ACQuire1

The Rear Panel - At a Glance

Quick Reference – 1

jGPIB (IEEE-488)

interface connector

kRS-232 interface

connector

lINH/FLT (remote

INHibit / internal FauLT) connector. Connector plug is removable.

mOutput and

Remote sense terminal block.

nFast/Normal switch oFuse holder pPower cord

connector (IEC 320)

Use the front panel Address menu to

♦ Select the GPIB or RS-232 interface (see chapter 4 in User’s Guide) ♦ Select the GPIB bus address (see chapter 4 in User’s Guide) ♦ Configure the RS-232 interface (see chapter 4 in User’s Guide)

General Information

Document Orientation

This manual describes the operation of the Agilent Model 66332A Dynamic Measurement DC Source and the Agilent Model 6631B/6632B/6633B/6634B System DC Power Supply. Unless otherwise noted, both units will be referred to by the description "dc source" throughout this manual. The following documents are shipped with your dc source:

♦ a User’s Guide (this document), contains installation, checkout, and front panel information ♦ a Programming Guide, contains detailed GPIB programming information ♦ an Agilent VXIplug&play instrument driver, for Windows 95 and Windows NT 4.0

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

Installing the unit

Line voltage 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 RS-232 interface

Programming the unit using SCPI (and Compatibility) commands

SCPI commands SCPI programming examples Compatibility language

Installing the VXIplug&play instrument driver

User’s Guide

User’s Guide Programming Guide

Programming Guide

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.

2 – General Information

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

020 Front panel output binding posts

760 Isolation and polarity reversal relays (not available on Agilent 6631B)

1CM Rack mount kit (p/n 5062-3974)

1CP Rack mount kit with handles (p/n 5062-3975)

Support rails are required when rack mounting units. Use E3663A support rails for Agilent rack cabinets, and

E3664A for non-Agilent rack cabinets.

0BN Service manual with extra operating manuals

100 Vac nominal, 50/60 Hz

120 Vac nominal, 50/60 Hz

220 Vac nominal, 50/60 Hz

230 Vac nominal, 50/60 Hz

Accessory Rack slide kit (p/n 1494-0060)

Table 2-2. Accessories

Item Part Number

GPIB cables

1.0 meter (3.3 ft) 10833A

2.0 meters (6.6 ft) 10833B

4.0 meters (13.2 ft) 10833C

0.5 meters (1.6 ft) 10833D

RS-232 cable 34398A

(9-pin F to 9-pin F, 2.5 meter, null modem/printer cable with one 9-pin M to 25-pin F adapter

RS-232 adapter kit (contains 4 adapters) 34399A

9-pin M to 25-pin M for pc or printer

9-pin M to 25-pin M for modem

9-pin M to 9-pin M for modem

General Information – 2

Description

Both the Agilent 66332A Dynamic Measurement DC Source and the Agilent 6631B/6632B/6633B/6634B System DC Power Supply combine two instruments in one unit. It includes a dc source, which produces dc output with programmable voltage and current amplitude, and a highly accurate voltage and current meter, with the capability to measure very low-level currents. Additionally, the Agilent 66332A Dynamic Measurement DC Source has the ability to measure and characterize output voltage and current of pulse or ac waveforms.

Capabilities

♦ Output Voltage and Current control with 12-bit programming resolution ♦ Extensive measurement capability:

dc voltage and current. rms and peak voltage and current (Agilent 66332A only). 16-bit measurement resolution (low range accurate down to 2 microamperes). Triggered acquisition of digitized current and voltage waveforms (Agilent 66332A only).

♦ Front panel control with 14-character vacuum fluorescent display, keypad, and rotary control for

voltage and current settings.

♦ Built-in GPIB and RS-232 interface programming with SCPI command language. ♦ Non-volatile state storage and recall. ♦ Over-voltage, over-current, over-temperature, and RI/DFI protection features. ♦ Extensive selftest, status reporting, and software calibration.

Front Panel Controls

The front panel has both rotary (RPG) 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: When shipped, Agilent 6631B/6632B/6633B/6634B units are set to the Compatibility

programming language; Agilent 66332A units are set to the SCPI programming language. To change the programming language from Compatibility to SCPI, press the front panel

Address key, use ô to scroll to the LANG command, press

press

Enter. Refer to the Programming Guide supplied with your dc source for further

information about remote programming.

The dc source may be remotely programmed via the GPIB bus and/or from an RS-232 serial port. GPIB programming is with SCPI commands (Standard Commands for Programmable Instruments), which make the dc source programs compatible with those of other GPIB instruments. Compatibility commands are also included to make the dc source compatible with the Agilent 6632A, 6633A, and 6634A Series dc

to select SCPI, then

2 – General Information

power supplies (refer to appendix D in the the Programming Guide). Dc source status registers allow remote monitoring of a wide variety of dc source operating conditions.

Output Characteristic

The dc source’s output characteristic is shown in the following figure. The output of the dc source may be adjusted to any value within the boundaries shown.

Output

Voltage

Vmax

VSET

-Imax

CV operating line

Imax

ISET-ISET

CC operating line

Output

Current

Figure 2-1. Dc Source Output Characteristic

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, the 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 maximum. The negative quadrant is identical to the positive quadrant. However, the negative current cannot be set independently; it tracks the value programmed for the positive current. Thus, if the positive current is set to 1 A, the negative current is also set to 1 A.

NOTE: If you attempt to operate the dc source beyond its output ratings, the output of the unit

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

Appendix A documents the dc source’s specifications and supplemental characteristics.

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 model number and the owner. Also include 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 nearest Agilent

Sales and Support Office

Digital connector 1252-1488A 4-terminal digital plug that connects to the back of the unit.

Output cover 06624-20007 Safety cover that installs over the output screw terminals.

Terminal block screws N/A 6-32 X 3/8 inch screws.

Line Fuse 2110-0055

2110-0002

Feet 5041-8801 feet for bench mounting

User's Guide 5962-8196 Contains installation, checkout, and front panel information.

Programming Guide 5962-8198 Contains detailed GPIB programming information.

A power cord appropriate for your location.

F4A for 100/120 Vac operation F2A for 220/230 Vac operation

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.

3 - Installation

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 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

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. Do not block the fan exhaust at the

rear of the unit.

Rack Mounting

The dc source can be mounted in a standard 19-inch rack panel or cabinet. Table 2-1 documents the Agilent 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

Installation - 3

Input Connections

Connect the Power Cord

1. Unscrew the line fuse cap from the rear panel and verify that the fuse rating matches what is

specified on the FUSES label on the rear panel. Reinstall the fuse. (See table 3-1 for part numbers.)

2. 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 (refer to the list at the back of this guide) to obtain the correct cord.

NOTE: The detachable power cord may be used as an emergency disconnecting device. Removing

the power cord from the ac input connector will disconnect ac input power to the unit.

Output Connections

The output terminal block has connections for the + and − output, the + and − sense inputs, and an earth ground terminal. The terminal block screws are 6-32 X 3/8 inch. Remove the safety cover by inserting a flat bladed screwdriver in the opening on the left side of the cover and pushing the locking tab to the left. This will release the cover.

Optional front panel binding posts are available to connect load wires for bench operation. The front panel binding posts are paralleled with the rear panel + and − connections. Before using the front panel binding posts, make sure that the output terminals are jumpered for local sensing.

NOTE: Front panel binding posts are provided for convenience. Only the rear panel terminals are

optimized for noise, regulation, and transient response as documented in Appendix A.

Wire Considerations

To minimize the possibility of instability on the output,

♦ keep load leads as short as possible ♦ bundle or twist the leads tightly together to minimize inductance

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. If there is more than one load, then any pair of load wires must be capable of safely carrying the full-rated 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. Ampacity (in free air) Resistance (at 20 deg. C)

Ω

ΩΩΩΩ/m

20 8.33 0.0345 0.01054 18 15.4 0.0217 0.00663 16 19.4 0.0137 0.00417 14 31.2 0.0086 0.00262 12 40 0.0054 0.00165

Ω/ft

ΩΩ

3 - Installation

Voltage Drops

The load wires must also be 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 voltage drops across the load wires should be limited to less than two volts. Refer to Table 3-2 to calculate the voltage drop for some commonly used AWG copper wire.

Multiple Load Connections

When the unit is in local sensing mode and you are connecting multiple loads to the output, connect each load to the output terminals using separate load leads. This minimizes mutual coupling effects and takes full advantage of the dc source’s low output impedance. Each pair of wires should be as short as possible and twisted or bundled to reduce lead inductance and noise pickup.

If cabling considerations require the use of distribution terminals that are located remotely from the dc

source, connect the dc source’s output terminals to the remote distribution terminals by a pair of twisted or bundled wires. Connect each load to the distribution terminals separately. Remote voltage sensing is recommended under these circumstances. Sense either at the remote distribution terminals, or if one load is more sensitive than the others, sense directly at the critical load.

twist or bundle

each pair

+ 240 VDC MAX TO

LOAD 1

LOAD 2

LOAD 3

-S

Figure 3-2. Multiple Load Connections

Installation - 3

Remote Sense Connections

Under normal operation, the dc source senses the output voltage at the output terminals on the back of the unit. External sense terminals are available on the back of the unit that allow the output voltages to be sensed at the load, compensating for impedance losses in the load wiring. You cannot remote sense at the

optional front panel binding posts.

The output terminal block of the unit is shipped configured for local sensing, with the +S terminal jumpered to +, and the −S terminal jumpered to −. Remove these jumpers when making your sense wire connections. The terminal block screws are 6-32 X 3/8 inch.

Sense Leads

The sense leads are part of the dc source’s feedback path and must be kept at a low resistance (less than several ohms) to maintain optimal performance. 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 regulate at the output terminals, resulting in a 3% to 5% increase in output over the programmed value. Shorting the sense leads trips the OVP circuit.

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

connectors. Connect the shield at the dc source end only. Do not use the shield as one of the sensing conductors.

remove

sense

jumpers

twisted or

shielded pair

+ 240 VDC MAX TO

-S

LOAD

Figure 3-3. Remote Sense Connections

3 - Installation

The overvoltage protection circuit senses voltage near the output terminals, not at the load. Therefore the signal sensed by the OVP circuit can be significantly higher than the actual voltage at the load. When using remote sensing, you must program the OVP trip voltage high enough to compensate for the voltage drop between the output terminals and the load. Also, if the sum of the programmed voltage and the loadlead drop exceeds the dc source’s maximum voltage rating, this may also trip the OV protection circuit.

Stability

When the unit is configured for remote sensing, it is possible for the impedance of the load wires and the capacitance of the load to form a filter, which becomes part of the unit’s feedback loop. This can degrade the unit’s stability and result in poor transient response performance. In extreme cases it may also cause oscillations. The wiring guidelines previously discussed under "Wire Considerations" will eliminate most stability problems associated with load lead inductance. If additional measures are required:

♦ keep the load capacitance as small as possible ♦ use larger diameter load wires to reduce resistance

OVP Considerations

The dc source’s OVP circuit contains a crowbar SCR, which effectively shorts the output of the dc source whenever the OVP trips. If an external voltage 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, program the OVP setting to its maximum value to prevent it from inadvertently tripping. Additionally, an internal fuse is connected in series with the SCR. This fuse will open to prevent large currents from damaging the SCR. If this internal fuse has opened, The FS status annunciator will be set. Refer to the Service Manual for instructions about replacing this fuse.

In addition, the OVP circuit’s SCR crowbar has been designed to discharge capacitances up to a specific limit. These limits are:

Agilent 6631B Agilent 6632B and

66322A Agilent 6633B

Agilent 6634B

127,000 µF. 50,000 µF.

20,000 µF. 10,000 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.

Installation - 3

Fast/Normal Operation

A switch on the rear of the unit lets you switch between operating in either Fast mode or Normal mode. When set to Fast mode, this switch disconnects the output capacitor that is located inside the unit. Fast mode lets you improve or enhance certain operating characteristics; while at the same time degrading other operating characteristics.

1. In Fast mode, the programming time for voltage programming is faster than for normal operation,

however, output noise is greater.

2. In Fast mode, the absence of the internal output capacitor results in increased output impedance and

therefore, greater stability when driving inductive loads. Conversely, the addition of external capacitive loads in Fast mode will reduce the stability of the unit during constant voltage operation.

3. In Normal mode, the internal output capacitor helps control peak voltage excursions away from the

the nominal value for sudden changes in load current. In Fast mode, larger peak voltage excursions will show up at the output of the unit during sudden load current changes.

Capacitive Loading

In Normal mode, the dc source will be stable for many load capacitances, however, large load

capacitances may cause ringing in the dc source’s transient response. If this occurs, the problem may be solved by increasing or decreasing the total load capacitance.

In Fast mode, the dc source can maintain stability only for small capacitive loads. These limits are:

Agilent 6631B Agilent 6632B and 66322A Agilent 6633B Agilent 6634B

2.2 µF.

1.0 µF.

0.22 µF.

0.10 µF.

Inductive Loading

Fast mode is recommended for driving inductive loads, although you will typically experience stable conditions in Normal mode. Inductive loads present no loop-stability problems in constant voltage operation, but may cause problems in constant current operation if the load impedance is outside the boundaries mentioned below.

The ratio of the load inductance (L) to the sum of the Equivalent Series Resistance (ESR) for the load (R1) and dc source (Rs), determines whether the source can drive a load without becoming unstable. To help determine this ratio, the value of Rs is listed as:

Agilent 6631B Agilent 6632B and

66322A Agilent 6633B

Agilent 6634B

If the ratio L/(R1 + Rs) is less than 0.005, the dc source can reliably drive the load.

0.1 ohm.

0.2 ohm.

1.0 ohm.

2.0 ohm.

3 - Installation

INH/FLT Connections

This rear panel connector, has a fault output port and an inhibit input port. The fault (FLT) output, also referred to as the DFI (discrete fault indicator) signal in the front panel and SCPI commands, 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 in the front panel and SCPI commands, is used to shut down the power supply output whenever the INH + is pulled low with respect to INH (chassis referenced) common.

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.

Figure 3-4 shows how you can connect the FLT/INH 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/RS-232.

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 controller can be made aware 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.

Digital I/O Connections

As shown in Table 3-3 and Figure 3-5, the FLT/INH 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 the Programming Guide. The electrical characteristics of the digital connector are described in appendix A.

Table 3-3. FLT/INH DIGital I/O Connector

PIN FAULT/INHIBIT DIGITAL I/O

1 FLT Output Output 0 2 FLT Common Output 1 3 INH Input Input/Output 2 4 INH Common Common

Installation - 3

(

)

B) Digital Interface Circuits

INH

FLT

NOTE: Connectors

are removable

FLT INH

INH Input

INH Common

Switch

Normall

Open

A) INH Example with One Unit

Figure 3-4. FLT/INH Examples

FLT Output

INH Input

1 2 3 4

INH Input

FLT Output

B) FLT Example with Multiple Units

+16.5V Max.

Coil Current

0.25A Max.

NOTE: Connectors

are removable

1 2 3 4

A) Relay Circuits

Digital Output

FLT INH

Ports 0, 1, 2

. . . .

+ - +

Relay Driver Ports 0, 1, 2 (contains internal

clamp diodes fo r inductive flyback)

Digital Input

Port 2

Figure 3-5. Digital I/O Examples

TTL, AS, CMOS, HC

3 - Installation

Controller Connections

The dc source connects to a controller either through an GPIB or an RS-232 connector.

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 controller 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 GPIB cables available from Agilent Technologies.)

♦ 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.

RS-232 Interface

The dc source has an RS-232 programming interface, which is activated by commands located in the front panel

Address menu. All SCPI and COMPatibility commands are available through RS-232

programming. When the RS-232 interface is selected, the GPIB interface is disabled.

The RS-232 connector is a DB-9, male connector. Adapters are available to connect the dc source to any computer or terminal with a properly configured DB-25 connector (see Table 2-2).

1 2 3 4 5

6 7 8 9

Figure 3-5. RS-232 Connector

Pin Input/Output Description

1 - no connection 2 Input Receive Data (RxD) 3 Output Transmit Data (TxD) 4 Output Data Terminal Ready (DTR) 5 Common Signal ground 6 Input Data Set Ready (DSR) 7 Output Request to Send (RQS) 8 Input Clear to Send (CTS) 9 - no connection

Turn-On Checkout

Introduction

Successful tests in this chapter provide a high degree of confidence that the dc source is operating properly. For verification tests, see appendix B. Complete performance tests are given in the Service Guide.

NOTE: This chapter provides a preliminary introduction to the dc source front panel. See chapter

5 for more details.

Using the Keypad

(shift) Some of the front panel keys perform two functions, one labeled in black and the other

in blue. You access the blue function by first pressing the blue shift key. Release the key after you press it. The Shift annunciator will be on, indicating that you have access to any key’s shifted function.

and These keys let you scroll up and down through the choices in the presently selected

and These keys let you select the previous or the next parameter for a specific command. If

and

Back space

Enter

function menu. All menu lists are circular; you can return to the starting position by continuously pressing either key.

ÌË

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 É and Ê keys to move the flashing digit.

ÊÉ

These Entry keys move the flashing digit in a numeric entry field to the right or left. This lets you increment or decrement a specific digit in the entry field using the Ë and Ì keys or the RPG knob.

The backspace key is an erase key. If you make a mistake entering a digit and have not yet pressed Enter, you can delete the digit by pressing Backspace. Delete more digits by repeatedly pressing 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 keys are displayed but not entered into the dc source. After pressing Enter, the dc source returns to Meter mode.

4 - Turn-On Checkout

Checkout Procedure

The test in this section checks for output voltage and current on the dc source. 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 4 of the Programming Guide. Note that the values shown in the Display column may not exactly match the values that appear on the front panel of your unit.

If you have not already done so, connect the power cord to the unit and plug it in.

Table 4-1. Checkout Programming Values

Model Voltage OV Prot Current Note:

6631B 8 8.8 10 This checkout procedure is written for models

6632B/66332A 20 22 5 6632B and 66332A. If you have another

6633B 50 55 2 model, enter the correct values from the table 6634B 100 110 1 Where the procedure calls for an <input>.

Procedure Display Explanation

1. Turn the unit on. The dc

source undergoes a selftest when you first turn it on.

**********

ADDRESS 5

0.2410V .0006A

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

*****V

the and the current. The flashing digit on the display indicates the digit that will be affected if changes are made to the displayed values using the rotary control or the Ë and Ì keys. You will only see the changes if the output is ON.

digits indicate the output voltage

*****A

digits indicate the output

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 4-2 at the end of this chapter.

2. Check that the dc source

fan is on

Press Voltage,

<2, 0>, Enter

VOLT 0.000

VOLT <20>

You should be able to hear the fan and feel the air coming from the back of the unit.

Programs the output to the selected voltage. After the value is entered, the display returns to Meter mode. Because the output has not been enabled, the meter still indicates 0 volts.

Press Output On/Off

Press Shift, OV

<20.003V>

0.0006A

VOLT:PROT

<22.00>

Turns the output on. The Dis annunciator should be off and CV should be on.

Display shows the overvoltage protection trip voltage for your unit.

Procedure Display Explanation

Turn-On Checkout - 4

Press 5, Enter

Press Shift, OV,

<2, 2>, Enter

Press Shift, Prot Clear

Press Output on/off

10. Connect a jumper wire

across the + and - output terminals.

11.

Press Output on/off.

12.

Press Current, <5>, Enter.

VOLT:PROT 5

0.449V 0.145A

VOLT:PROT <22> Programs the OVP to a value greater than the

<20.003V>

0.0034A

0.0005V

<0.5005>A

0.0452V

<5.002>A

Programs the OVP to 5 volts, which is less than the previously set output voltage. Because the OVP voltage entered was less than the output voltage, the OVP circuit tripped. The output dropped to zero, CV turned off, and Prot turned on.

output voltage setting of the unit. This prevents the OV circuit from tripping again when the protection condition is cleared.

Clears the protection condition, thus restoring the output of the unit. Prot turns off and CV turns on.

Turn the output off. Shorts the output of the unit.

The CC annunciator is on, indicating that the unit is in constant current mode. The unit is sourcing output current at 10% of the maximum rating (the default output current limit setting).

Programs the output current to the selected amperes.

13.

Press Shift, OCP

14.

Press Shift, OCP

15.

Press Shift, Prot Clear

16. Turn the unit off and

remove the shorting wire from the output terminals.

0.0005V 0.0003A You enabled the overcurrent protection circuit. The circuit then tripped because the unit was operating in constant current mode. The CC annunciator turns off and the OCP and Prot annunciators come on.

0.0005V 0.0003A You have disabled the overcurrent protection circuit. The OCP annunciator turns off.

0.0452V

<5.002A>

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

The next time the unit turns on it will be restored to the *RST or factory default state.

4 - Turn-On Checkout

In Case of Trouble

Error Messages

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 Errors

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 4-2. 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

Runtime Error Messages

Appendix C lists other error messages that may appear at runtime. 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 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 power source to be certain line voltage is being supplied to the dc source. If the power source is normal, the dc source fuse may be defective.

1. Turn off the front panel power switch and unplug the power cord.

2. Remove the fuse from the rear panel.

3. If the fuse is defective, replace it with a fuse of the same type (see "Input Connections" in chapter 3).

4. Turn on the dc source and check the operation.

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

0-20V / 02A

Dynamic Measurement DC Source

Prot

Cal Shift Rmt Addr Err SRQ

LINE

66XXA

CV CC Unr Dis OCP

Off

Figure 5-1. Front Panel, Overall View

SYSTEM

Local

Error

Address

Save

Recall

Shift

ENTRY

OCP

Cal

Input

Meter

Voltage

Current

Output

FUNCTION

Prot Clear Protect

Output

on/off

6 7 8

OUTPUT

Clear Entry

Back space

Enter

240 VDC

Max

5 - Front Panel Operation

j Display

k Annunciators

l Rotary Control

m Output

Connectors

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 selected interface (GPIB or RS-232) 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 value with the knob.

Optional front panel binding posts let you connect loads to the front of the unit. Before using the front panel binding posts, make sure that the output terminals are jumpered for Local sensing.

and Ê to select the resolution, then adjust the

n Line o System Keys

p Function Keys

q Entry Keys

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 Set the RS-232 interface communication baud rate and parity bit Display SCPI error codes and clear the error queue Save and recall up to 4 instrument operating configurations

Function access command menus that let you:

Enable or disable the output Select metering functions Program output voltage and current Display the protection status state Set and clear protection functions Set the output state at power-on Calibrate the dc source

and q scroll through the front panel menu commands

Entry keys let you:

Enter programming values Increment or decrement programming values

and Ì 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

Local

Error

Address

Save Recall

Shift

Figure 5-2. System Keys

Local

Address

Recall

Shift

Error

SaveShift

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. 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.

Press to access the system address menu. This menu lets you configure the dc source’s interface. Address Menu entries are stored in non-volatile memory.

Display Command Function

ADDRESS <value> Sets the GPIB Address INTF <char> Selects an interface (GPIB or RS232) BAUDRATE<value> Selects baud rate (300, 600, 1200, 2400, 4800, 9600) PARITY <char> Message parity (NONE, EVEN, ODD, MARK, SPACE) FLOW <char> Flow control (XON-XOFF, RTS-CTS, DTR-DSR, NONE) LANG <char>I Selects language (SCPI or COMP)

value = a numeric value char = a character string parameter Use and to scroll through the command list.

Ë Ì

Use and to scroll through the parameter list.

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

Press to display the system error codes stored in the SCPI error queue. This action also clears the queue. If there is no error in the queue, 0 is displayed.

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

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

OCP

Current

Cal

Output

Prot Clear

Protect

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

Prot ClrShift

OCPShift

This key toggles the output of the dc source between the on and off states. 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. (If FS protection is displayed on the front panel, the unit must be opened and an internal fuse replaced as described in the Service manual.)

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.

 ô

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. When the unit is operating in front panel meter mode, all front panel measurements are calculated from a total of 2048 readings taken at a 46.8 microsecond sampling rate. Therefore, the total acquisition time for a single front panel measurement is

about 100 milliseconds. Refer to “Making Front Panel Measurements” for more information.

NOTE: You can vary the both the sampling rate and the number of data points in each

measurement when controlling the unit over the GPIB interface. (Refer to chapter 3 in the Programming Guide).

Meter

Shift Input

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

<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 of a voltage pulse waveform <reading>V LOW Measures the low level of a voltage pulse 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 pulse waveform <reading>A LOW Measures the low level of a current pulse waveform <reading>A RMS Measures rms current

Press this key to access the following metering functions.

Display Command Function

CURR:RANGE <char> Select current range (AUTO, LOW or HIGH) CURR:DET <char> Select current measurement bandwidth (ACDC or DC)

Notes:

Available on Agilent Model 66332A in SCPI language mode only. reading = the returned measurement value = a numeric value char = a character string parameter Use and to scroll through the menu commands.

Ë Ì

Use and to scroll through the menu parameters.

É Ê

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

5 - Front Panel Operation

Output Control Keys

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

Voltage

Current

Output

Press this key to access the voltage menu.

Display Command Function

VOLT <value> Sets the output voltage

Press this key to access the current menu.

Display Command Function

CURR <value> Sets the output current

Press this key to access the output menu list.

Display Command Function

*RST Places the dc source in the factory-default state PON:STATE <char> Select the power-on state command (RST or RCL0) RI <char> Sets the remote inhibit mode (LATCHING, LIVE, or OFF) DFI <char> Sets the discrete fault indicator state (ON or OFF) DFI:SOUR <char> Selects the DFI source (QUES, OPER, ESB, RQS, or OFF) PORT <char> Sets the output port functions (RIDFI or DIGIO)

Protect

DIGIO <char> Sets and reads the I/O port value (0 through 7) RELAY <char> REL:POL <char>

Set relay state independent of output (‘‘ON’’ or ‘‘OFF’’) Set relay polarity (‘‘NORM’’ or ‘‘REV’’).

PROT:DLY <value> Sets the output protection delay in seconds

Press this key to display protection status.

Display Command Function

OC OT OV RI FS Status of the protection features (example shows all tripped)

-- -- -- -- -- Status of the protection features (example shows none tripped)

OVShift

Press this key to access the overvoltage protection menu.

Display Command Function

VOLT:PROT <value> Sets overvoltage protection level

CalShift

This key accesses the calibration menu (Refer to Appendix B to calibrate your dc source).

Notes:

These parameters are stored in non-volatile memory

These status summary bits are explained in chapter 3 of the Programming Guide value = a numeric value char = a character string parameter Use and to scroll through the menu commands.

Ë Ì

Use and to scroll through the menu parameters.

É Ê

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.

ENTRY

Back space

Shift Clear Entry

Enter

Clear Entry

Back space

Enter

Figure 5-4. Entry Keys

ÌË

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.

ÊÉ

These keys move the flashing digit in a numeric entry field to the right or left. This lets you increment or decrement a specific digit in the entry field using the

and

−

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

the minus sign. For example, to enter 33.6 press:

Enter

keys or the RPG knob.

Enter Number, 3, 3, . , 6,

The backspace key deletes the last digit entered from the keypad. This key lets you correct one or more wrong digits before they are entered.

This key aborts a keypad entry by clearing the value. This key is convenient for correcting a wrong value or aborting a value entry. The display then returns to the previously set function.

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

Enter, you can change or abort anything previously entered into the display.

After

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 Setting the output voltage and current 2 Querying and clearing output protection 3 Making front panel measurements 4 Programming the digital port 5 Programming the output relay (Option 760 only) 6 Setting the GPIB address or RS-232 parameters 7 Saving and recalling operating states Similar examples are given in the dc source Programming Guide using SCPI commands.

1 - Setting the Output Voltage and Current

Set the output voltage

Action Display

1. To enter an approximate value without using the voltage menu: On the Entry keypad, press É or Ê 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.

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

3. To make minor changes to an existing value: On the Function keypad, press Voltage. On the Entry keypad, press É or Ê 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 Ë 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

Action Display

1. To enter an approximate value without using the current menu: On the Entry keypad, press É or Ê to select the tenths digit in the current field. Rotate the front panel RPG knob to obtain 0.9A.

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

2. The easiest way to enter an accurate value: On the Function keypad, press Current. On the Entry keypad, press ., 9, Enter.

3. To make minor changes to an existing value: On the Function keypad, press Current. On the Entry keypad, press É or Ê to select the digit in the numeric field that you wish to change. For example, move the flashing digit to the tenths column to change a value in this column. Then, press Ë to scroll from 0.900 to 1.000. Then press Enter.

Enable the output

Action Display

On the Function keypad, press Output On/Off to enable the output. The Dis annunciator will go off, indicating that the voltage is now applied to the output terminals. The A display indicates the actual output current.

8.003V 0.900A

CURR 0.900

CURR 1.000

8.003V 1.000A

Front Panel Operation - 5

2 - Querying and Clearing Output Protection

The dc source will disable its output if it detects an overvoltage or overcurrent fault condition. Other automatic fault conditions (such as overtemperature) also will disable the output.

Query and clear the dc source overcurrent protection feature as follows:

Action Display

On the Function keypad, press Protect. In this example, OC indicates that an overcurrent condition has occurred. Other protection indicators are: OT (overtemperature), OV (overvoltage), RI (remote inhibit), and FS (internal fuse is open).

On the Function keypad, press Current. This displays the present output current limit. (10% of the maximum rating is the default current limit setting).

3. To restore normal operation after the cause of the overcurrent condition has been removed, press Shift, Prot Clr. The OCP annunciator then will go off.

OC -- -- -- --

CURR 0.2045 (2 amp unit)

3 - Making Front Panel Measurements

When the dc source is operating in front panel meter mode, all front panel measurements 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. The sample rate and number of data points are fixed, and there are no trigger controls for front panel measurements. This fixed 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.

When controlling the unit over the GPIB interface, you can vary both the sampling rate and the number of data points in each measurement. If you are using the Agilent 66332A dc source to measure waveform data, the GPIB interface also lets you qualify the triggers that initiate the measurements. With this flexibility, measurement accuracy can be improved for waveforms with frequencies as low as several Hertz. Refer to chapter 3 in the Programming Guide for more information.

Two current measurement ranges can be selected in the Input menu. A high current range is available for measuring output currents up to the 30% higher than the maximum rating of the dc source. A low 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 that provides the best measurement resolution.

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.

As previously mentioned, the Agilent 66332A dc source has the capability of measuring output waveform parameters such as peak, minimum, high level, and low level as illustrated in the following figure.

5 - Front Panel Operation

V or A MAX

V or A HIGH

V or A LOW

V or A MIN

46.8 microsecond sampling rate

100 millisecond acquisition time

NOTE:

Measurement samples may not

coincide with the actual maximum or minimum point of the waveform.

Figure 5-5. Front Panel Pulse Measurement Parameters (Agilent 66332A only)

Use the Meter menu for making front panel measurements:

Action Display

For current measurements, press Shift, Input. Then press Ì until you obtain the CURR:RANG AUTO command. Press Enter to activate autoranging. Two other selections are also available. Select the High range when measuring currents above 20 mA. Select the Low range for improved resolution when measuring currents below 20 mA.

For output waveform measurements, press Shift, Input. Then press q 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 1mA on the High current measurement range.

CURR:RANG AUTO

CURR:DET ACDC

Note: In the Low 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 a few kHz.

On the Function keypad press Meter and press q 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

Agilent 66332A only

<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

Front Panel Operation - 5

4 - Programming the Digital Output Port

Your dc source is shipped with the output port function set to RIDFI mode. In this mode the port functions as a remote inhibit input with a discrete fault indicator output signal. You can also configure the port to act as a Digital Input/Output device.

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 q . The PORT command lets you select either the RIDFI or the DIGIO function.

3. Scroll to the RI command to configure the Remote INHibit indicator. Use the Ë and Ì keys to select either LIVE or LATCHING, either of which enable the RI indicator. 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 command lets you enable the Discrete Fault Indicator. Use the Ì key and select ON to enable the FLT output. 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 Ì key to select from the RQS or ESB bits, or the Operation or Questionable status registers. Status summary bits are explained in chapter 3 of the Programming Guide.

*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 q. The PORT command lets you select either the RIDFI or the DIGIO function.

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

*RST PORT DIGIO

DIGIO 5

5 - Front Panel Operation

5 - Programming the Output Relay (option 760 only)

Units with option 760 have isolation and polarity reversal relays connected to the output and sense terminals. (Option 760 is not available on Agilent 6631B units.)

To control the relays independently of the Output On/Off switch, proceed as follows:

Action Display

On the Function keypad, press Output, and scroll through the Output menu until you get to the RELAY command. The display indicates whether the relay is presently closed (ON), or open (OFF).

2. Use the Ë and Ì keys to select either ON to close the relay or OFF to open the relay. Note that the output relays always open or close

whenever the Output On/Off key is pressed.

RELAY ON

RELAY OFF

To control the polarity of the output relays, proceed as follows:

Action Display

On the Function keypad, press Output, and scroll through the Output menu until you get to the REL:POL command. The display indicates the present condition of the relay (either normal or reversed).

2. Use the Ë and Ì keys to select either NORM or REV. NORMal causes the relay polarity to be the same as the dc source output REVerse causes the relay polarity to be opposite to that of the dc source output.

REL:POL NORM

RELAY OFF

6 - Setting the GPIB Address and RS-232 Parameters

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 Address key. This menu is also used to select the RS-232 interface and specify RS-232 parameters such baud rate and parity.

Set the GPIB address as follows:

Action Display

On the System keypad, press Address.

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

Configure the RS-232 interface as follows:

Action Display

On the System keypad, press Address.

2. Scroll through the Address menu by pressing q . The interface command

lets you select the RS-232 interface. The baudrate command lets you select the baudrate. The parity command lets you select the parity. The flow command selects the flow control options.

3. The Ë and Ì keys let you select the command parameters.

ADDRESS 5 ADDRESS 7

ADDRESS 5 INTF RS232

BAUDRATE 9600 PARITY EVEN XON-XOFF

Front Panel Operation - 5

7 - Saving and Recalling Operating States

NOTE: This capability is only available when the unit is set to the SCPI programming language.

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.

Save an operating state in location 1 as follows:

Action Display

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

Save this state to location 1. Press Save, 1, Enter.

*SAV 1

Recall a saved state as follows:

Action Display

Recall the state saved in location 1 by pressing Recall, 1, Enter

*RCL 1

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 Ë and Ì 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.

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 factory-default settings.

Save these settings to location 1. Press Save, 1, Enter.

3. Repeat step #2 for memory locations 2 through 4.. *SAV 2

*RST

*SAV 1

*SAV 3 *SAV 4

Specifications

Table A-1 lists the specifications of the dc source. Specifications are warranted over the ambient temperature range of 0 to 55 °C. Unless otherwise noted, specifications apply when measured at the rear terminals after a 30-minute warm-up period.

Table A-1. Performance Specifications

Parameter Agilent

6631B

Output Ratings

Voltage:

Current:

Programming Accuracy

(@ 25C ±5°C)

DC Measurement Accuracy

(via GPIB or frontpanel meters with respect to actual output at 25C ±5°C)

Ripple and Noise

(in the range of 20 Hz to 20 MHz with outputs ungrounded or with either terminal grounded)

Load Regulation

(change in output voltage

Low Current range

−20 mA to +20 mA: High Current range

+20mAto+ratedI:

−20 mA to −rated I:

Normal mode voltage

Fast mode voltage

Voltage:

+Current:

Voltage:

(rms/p-p):

Current (rms):

Voltage:

Current: or current for any load change within ratings)

Line Regulation

(change in output voltage

Voltage:

Current: or current for any line change within ratings)

Transient Response

Time

Normal mode:

Fast mode: (for the output voltage to recover to its previous level within 0.1% of the voltage rating of the unit or 20 mV following a change in load current of up to 50% of the output current rating)

0.05% +6.63mA ('31B), 3.32mA ('32B/332A), 1.53mA ('33B), 0.76mA ('34B) when programming between zero and 0.03% of full scale current

This specification may degrade slightly when the unit is subjected to an RF field ≥3 V/meter.

For Agilent 66332A: applies in SCPI mode, with current detector set to DC. With current detector set to ACDC, accuracy is 0.2% + four times

the fixed error value. In COMPatibility mode, accuracy is 0.2% + six times the fixed error value.

For Agilent6631B, 6632B, and 66332A (from 1 MHz to 20 MHz ) = 0.3mV/15mV;

For Agilent6633B and 6634B (from 1 MHz to 20 MHz ) = 0.5mV/15mV

Applies at rear terminals with unit set to remote sensing and with sense terminals externally jumpered to their respective output terminals. For units with Option 760, Normal mode transient response is as follows: < 250µs ('32B/332A); < 230µs ('33B/34B),

0 − 8V

0 − 10A

0.05% + 5mV

0.05% + 4mA

0.03% + 2 mV

0.1% + 2.5 µA

0.2% + 1 mA

0.2% + 1.6 mA

0.3mV/3mV

1mV/10mV

3mA 2mV 2mA

0.5 mV 1mA

< 100 µs <50µs

Agilent 6632B

Agilent

66332A

0.05% + 10mV

0.05% + 2mA

0.03% + 3 mV

0.1% + 2.5 µA

0.2% + 0.5 mA

0.2% + 1.1 mA

0.3mV/3mV

1mV/10mV

0 − 20 V

0 − 5A

2mA 2mV 1mA

0.5 mV

0.5 mA

0.2% + 0.25 mA

Agilent

6633B

0 − 50 V

0 − 2A

0.05% + 20mV

0.05% + 1mA

0.03% + 6 mV

0.1% + 2.5 µA

0.2% + 0.85 mA

0.5mV/3mV

1mV/15mV

2mA 4mV 1mA

1mV

0.25 mA

0.05% + 50mV

0.05% + 0.5

0.03% + 12 mV

0.1% + 2.5 µA

0.2% + 0.25 mA

0.2% + 0.85 mA

0.6mV/5mV

Agilent

6634B

0 − 100 V

0 − 1A

2mV/25mV

2mA 5mV 1mA

1mV

0.25 mA

A - Specifications

Supplemental Characteristics

Table A-2 lists the supplemental characteristics, which are not warranted but are descriptions of typical performance determined either by design or type testing.

Table A-2. Supplemental Characteristics

Parameter Agilent 6631B Agilent 6632B

Input Ratings

(at full load)

Output Programming Range

Average Programming Resolution

OVP Accuracy

Maximum Current Measurement

Average Current Measurement Resolution

Sink Current

Sink Current Tracking

Minimum Current in Compatibility Mode

Programming Accuracy Temperature Coefficient

(change/°C)

Readback Accuracy Temperature Coefficient

(change/°C)

Drift

Output Voltage Rise/Fall Time

Output Voltage Settling Time

For 8 volt unit, between 0 and 10 mA, the sink current remains at –10 mA.

100 Vac mains: 120 Vac mains: 220 Vac mains: 230 Vac mains:

Voltage:

Current:

OVP:

Voltage:

Current:

OVP:

High Range:

Low Range:

SCPI mode

Compatibility mode:

Voltage:

Current:

OVP:

Voltage:

Current (ACDC):

Current (DC):

Current (Low range):

Voltage:

Current:

Normal mode:

Fast mode:

Normal mode:

Fast mode:

0-8.190 V

0-10.237A

0-12V

2 mV

2.63 mA

60 mV

2.4% + 100 mV 2.4% + 240 mV 2.4% + 600 mV 2.4% + 1.2 V

14.3 A 6.66 A 2.43 A 1.21 A

436 uA

0.6 uA

-10 A

0.4% + 4 mA

-500 mA

40 mA 20 mA 8 mA 4 mA

0.01% + 0.15 mV

0.01% + 60 uA

0.01% + 2 mV

0.01% + 60 uV

0.05% + 320 uA

0.02% + 50uA

0.01% + 0.3 uA

0.01% + 0.25 mV

0.01% + 100uA

(for a change from 10% to 90% or 90% to 10% of the total excursion)

(to settle within 1 LSB or 0.025% times the rated voltage of the final value)

Agilent 66332A

100 Vac nominal, 50/60 Hz, 3.5 A, 380 VA max.

120 Vac nominal, 50/60 Hz, 3 A, 380 VA max.

220 Vac nominal, 50/60 Hz, 1.6 A, 380 VA max

230 Vac nominal, 50/60 Hz, 1.5 A, 380 VA max

0−20.475 V 0−5.1188 A

0−22 V

5 mV

1.32 mA 100 mV

213 µA

0.6 µA

−5 A −2 A −1 A

0.4% + 2 mA

−250 mA

0.01% +0.25 mV

0.01% + 30 µA

0.015% + 4 mV

0.01% + 150 µV

0.05% + 160 µA

0.02% + 25 µA

0.01% + 0.3 µA

0.01% + 0.5 mV

0.01% + 50 µA

For 20 volt unit, between 0 and 5mA, the sink current remains at –5 mA. For 50 volt unit, between 0 and 2.5 mA, the sink current remains at –2.5 mA. For 100 volt unit, between 0 and 1.25 mA, the sink current remains at –1.25 mA.

Following a 30 minute warm-up, the change in output over 8 hours, under ambient temperature,

constant load, and line operating conditions.

Agilent 6633B Agilent 6634B

0−51.188 V

0−2.0475 A

0−55 V

12.5 mV

0.526 mA 250 mV

74 µA

0.6 µA

0.4% + 1 mA

−100 mA

0.01% + 0.5 mV

0.01% + 12 µA

0.015% + 10 mV

0.01% + 500 µV

0.05% + 80 µA

0.02% + 10 µA

0.01% + 0.3 µA

0.01% + 1 mV

0.01% + 20 µA

2 ms

400 µs

6 ms 2 ms

0−102.38 V

0−1.0238 A

0−110 V

0.263 mA

0.4% + 0.5 mA

0.01% + 1 mV

0.01% + 6 µA

0.015% + 20 mV

0.01% + 750 µV

0.05% + 40 µA

0.02% + 5 µA

0.01% + 0.3 µA

0.01% + 1 mV

0.01% + 10 µA

25 mV

500 mV

37 µA

0.6 µA

−50 mA

Table A-2. Supplemental Characteristics (continued)

Parameter Agilent 66332A Agilent

6631B/6632B/6633B/6634B

Specifications - A

Dynamic Measurement Accuracy

Dynamic Measurement System

Measurement Time

(voltage or current)

Command Processing Time

Remote Sense Capability

Savable Instrument States

(applies only in SCPI mode)

RS-232 Interface Capabilities

GPIB Interface Capabilities

Instantaneous Voltage:

Instantaneous Current:

Buffer Length:

Sampling Rate Range:

Baud rates:

Data formats:

Language: Language:

Interface:

0.03% + 5 mV

0.6% + 2 mA 4096 points

not applicable

15.6µs−31,200s 50 ms average

(includes the default time of 30 ms

for acquiring

data, and a 20 ms data processing overhead)

4 ms average

(for output to begin to change

following receipt of digital data)

Up to 2 V can be dropped across each load lead.

(add 2 mV to the voltage load regulation

specification for each 1 V change in the positive

output lead due to load current change.)

4 (in locations 0 to 3)

300 600 1200 2400 4800 9600

7 bits even or odd parity; 8 bits without parity

SCPI or COMPatibility

AH1, C0, DC1, DT1, E1, L4, PP0, RL1, SH1,

SR1, T6

INH/FLT Characteristics

Maximum ratings:

16.5 Vdc between terminals 1 and 2; 3 and 4; and from terminals 1 or 2 to chassis ground

FLT Terminals:

Low-level output current = 1.25 mA max.

Low-level output voltage = 0.5 V max.

INH Terminals:

Low-level input voltage = 0.8 V max.

High-level input voltage = 2 V min.

Low-level input current = 1 mA

Pulse width = 100 µs min.

Time delay = 4 ms typical

For full scale current changes with a risetime of 20 µs, an additional 0.5% error exists in the first data point in the

buffer after the change. The error percentage increases proportionally with the decrease in risetime.

This time may be reduced by changing the default conditions of 2048 data points, however, measurement accuracy

will be reduced.

COMPatibility language is used to program the Agilent 663xA Series power supplies.

A - Specifications

Parameter Agilent 66332A Agilent

Table A-2. Supplemental Characteristics (continued)

6631B/6632B/6633B/6634B

Digital I/O Characteristics

Isolation to Ground Recommended Calibration

Interval Regulatory Compliance

Dimensions

(see figure 3-1)

Maximum ratings:

Digital OUT Port

0,1,2 (open collector)

Digital IN Port 2:

(internal pull-up)

Listing pending:

Certified to:

Conforms to:

Complies with:

same as INH/FLT Characteristics

Output leakage @ 16V = 0.1 mA (ports 0,1)

= 12.5 mA (port 2)

Output leakage @ 5V = 0.1 mA (ports 0,1)

= 0.25 mA (port 2)

Low-level output sink current @ 0.5 V = 4 mA

Low-level output sink current @ 1 V = 50 mA

Low-level input current @ 0.4 V = 1.25 mA

High-level input current @ 5 V = 0.25 mA

Low-level input voltage = 0.8 V max. High level input voltage = 2.0 V min.

240 Vdc maximum from chassis ground

1 year

(from the date the unit is put into service)

UL 3111-1

CSA 22.2 No. 1010.1

IEC 1010-1

EMC directive 89/336/EEC (ISM Group1 Class B)

Height 88.1mm (3.5in.)

Width 425.5mm (16.75in.)

Depth 364.4mm (14.3in.)

Net weight Shipping weight

12.7 kg (28 lbs.) 15 kg (33 lbs.)

Verification and Calibration

Introduction

This appendix includes verification and calibration procedures for the Agilent 66332A and Agilent 6631B/6632B/6633B/6634B dc source. Instructions are given for performing the procedures either from the front panel or from a controller over the GPIB.

The verification procedures do not check all the operating parameters, but verify that the dc source is performing properly. Performance Tests, which check all the specifications of the dc source, are given in the applicable dc source Service Manual.

Important Perform the verification procedures before calibrating your dc source. If the dc source

passes the verification procedures, the unit is operating within its calibration limits and does not need to be recalibrated.

Equipment Required

The equipment listed in the following table, or the equivalent to this equipment, is required for verification and calibration.

Table B-1. Equipment Required

Equipment Characteristics Recommended Model

Digital Voltmeter

Current Monitor Load Resistor

(3 W min. TC=20ppm/°C)

Power Supply 8 V @ 10 A Agilent 6631B GPIB Controller

The 4- terminal current shunt is used to eliminate output current measurement error caused by voltage drops in the load leads and connections. It has special current-monitoring terminals inside the load connection terminals. Connect the voltmeter directly to these current-monitoring terminals.

Resolution: 10 nV @ 1 V Readout: 8.5 digits Accuracy: >20 ppm

15 A (0.1 Ω), ±0.04%, TC=5ppm/°C 400Ω (Agilent 6631B calibration, used for

verification of all models)

1.1 kΩ (Agilent 6632B/66332A calibration)

2.5 kΩ (Agilent 6633B calibration) 5 kΩ (Agilent 6634B calibration)

Full GPIB capabilities HP Series 200/300 or

Agilent 3458A

Guildline 9230/15

p/n 0811-2878

equivalent

Test Setup

Figure B-1 shows the setup for the tests. Be certain to use load leads of sufficient wire gauge to carry the full output current (see chapter 3).

B - Verification and Calibration

Ammeter

+ 240 VDC MAX TO

+ - -S

+--S

Voltmeter

Current monitor

Load Resistor

400 6631B

+ 240 VDC MAX TO

+--S

External

DC supply

Load

resistor

1.1K 6632B & 66332A

2.5 K 6633B 5 K 6634B

Voltmeter

Current monitor

Figure B-1. Verification & Calibration Test Setup

+ 240 VDC MAX TO

+--S

External

DC supply

Load

resistor

Performing the Verification Tests

NOTE: The verification procedure can only be performed using the SCPI language commands.

Use either the front panel Address key to access the LANG command, or use the SYSTem:LANGuage command to change the programming language to SCPI.

The following procedures assume you understand how to operate the dc source from the front panel as explained in chapter 5.

When performing the verification tests from an GPIB controller, you may have to consider the relatively slow settling times and slew rates of the dc source as compared to computer and system voltmeters. Suitable WAIT statements can be inserted into the test program to give the dc source time to respond to the test commands.

Perform the following tests for operation verification in the order indicated.

1. Turn-On Checkout

2. Voltage Programming and Measurement Accuracy

3. Current Programming and Measurement Accuracy

Verification and Calibration - B

Table B-2. Verification Programming Values

Full scale Voltage Full Scale Current Imax Isink 6631B 8 10 10.238 - 10 A 6632B/66332A 20 5 5.1188 - 5 A 6633B 50 2 2.0475 - 2 A 6634B 100 1 1.0238 - 1 A

Turn-On Checkout

Perform the Turn-On Checkout as directed in chapter 4. NOTE: The dc source must pass turn-on selftest before you can proceed with the verification

tests.

Voltage Programming and Measurement Accuracy

This test verifies the voltage programming, GPIB measurement, and front panel meter functions. Values read back over the GPIB should be the same as those displayed on the front panel. Measure the dc output voltage at the output terminals. Make sure the output mode switch is set to Normal and the sense terminals are directly jumpered to the output terminals.

Action Normal Result

1. Turn off the dc source and connect a DMM to the output terminals.

2. Turn on the dc source with no load on the output. Set the output voltage to 0 V and the output current to full scale (see table B-2). Press Output On/Off to enable the output.

3. Record voltage readings at the DMM and on the front panel display in the appropriate table.

4. Set the output voltage to the full scale rated voltage (see Table B-2).

5. Record voltage readings at the DMM and on the front panel display in the table.

Output voltage near 0 V. Output

current near 0 A.

Readings within low voltage

limits (see table B-3, 4, 5, or 6).

Output voltage near full scale.

Readings within high voltage

limits (see table B-3, 4, 5, or 6).

Current Programming and Measurement Accuracy

This test verifies the current programming and measurement. Connect the appropriate current monitor (see table B-1) as shown in figure B-1A.

Current Programming and Measurement (High Range)

Action Normal Result

1. Turn off the dc source and connect the DMM and current monitor as shown in figure B-1A.

2. Turn on the dc source, access the Input menu, and set the current sense detector to DC.

Set the output voltage to 5 V and the current to 0 A. Press Output On/Off to enable the output.

4. Divide the voltage drop across the current monitor by its resistance to convert the value to amperes. Record the value.

5. Set the output current to its full scale value (see Table B-2).

limits (see table B-3, 4, 5, or 6).

CURR:DET DC

Output current near 0 A.

Readings within low current

B - Verification and Calibration

6. Divide the voltage drop across the current monitor by its resistance to convert the value to amperes. Record this value and the current reading on the front panel display.

Readings within high current

limits (see tables B-3,4, 5 or 6).

Current Measurement (Low Range)

Action Normal Result

7. Turn off the dc source and connect it as shown in figure B-1B

with the 400 ohm load resistor. Set the DMM to operate in current mode.

8. Turn on the dc source, access the Input menu, and set the current

range to LOW.

9. Set the output voltage to 0 V and the current to its full scale value

(see table B-2). Press Output On/Off to enable the output.

10. Record the current reading from the DMM as well as from the

front panel display. The difference between the two readings

should be within the limits specified in the table.

11. Set the output voltage to 8 volts. Output current near +20 mA.

12. Record the current reading from the DMM as well as from the

front panel display. The difference between the two readings

should be within the limits specified in the table.

CURR:RANG LOW

Output current near 0 A.

Readings within low current

measurement (see table B-3, 4,

5 or 6).

Readings within high current

measurement (see table B-3, 4,

5 or 6).

Current Sink Measurement

Action Normal Result

13. Turn off the dc source and connect an external supply to the

output of the unit as shown in figure B-1C using a 400 ohm load resistor. Set the DMM to operate in current mode.

14. Turn on the dc source, access the Input menu, and set the current

range to LOW.

15.Access the Input menu and set the current sense detector to DC.CURR:DET DC

16.Turn on the external supply and program its output for 8 volts

and 1 A. Program the dc source to 0 V and 1 A. Press Output On/Off to enable the output.

17.Record the current reading from the DMM as well as from the

front panel display. Enter the difference between the two readings

should be within the limits specified in the table.

18. Turn off the dc source and connect the current monitor and

external supply to the output of the unit as shown in figure B-1D. Set the DMM to operate in dc voltage mode.

19.Turn on the external supply and program its voltage to 5 volts

and current for the full scale current rating of the UUT. Program the dc source to 0 V and full scale current (see table B-2). Press Output On/Off to enable the output.

20. Divide the voltage drop across the current monitor by its

resistance to convert the value to amperes. Record this value as well as the current reading on the front panel display. The difference between the two readings should be within the limits

specified in the table.

CURR:RANG LOW

Output current near −20 mA.

Readings within low current

sink measurement

(see table B-3,4, 5 or 6).

Output near −full scale current.

Readings within high current

sink measurement

(see table B-3, 4, 5 or 6).

Verification and Calibration - B

Table B- 3. Verification Test Record for Agilent 6631B

Model Agilent 6631B Report No.____________ Date_____________ Test Description Minimum

Specification

Voltage Programming and Measurement

Low Voltage V

out

Front Panel measurement High Voltage V

out

Front Panel measurement

−

5 mV

−2 mV

out

8.991 V _______V 8.009 V

−4.4 mV

out

Current Programming and Measurement (High Range)

Low Current I High Current I

out

Front Panel measurement

−

4 mA

9.991 A _______A 10.009 A

−21 mA

out

Current Measurement (Low Range)

Low Current measurement High Current measurement

−2.5 µA _____µAI

out

−22.5 µA _____µAI

out

Current Sink Measurement

Low Current Sink measurement High Current Sink measurement

−22.5 µA _____µAI

sin

−21.6 mA

sin

Recorded Results Maximum

Specification

_______V +5 mV

_____mV V

+2 mV

out

+4.4 mV

out

_______A 4 mA

_____mA I

+21 mA

out

+2.5 µA

out

+22.5 µA

out

+22.5 µA

sin

+21.6 mA

sin

Table B- 4. Verification Test Record for Agilent 66332A or Agilent 6632B

Model Agilent______________________ Report No.____________ Date_____________

Test Description Minimum

Specification

Voltage Programming and Measurement

Low Voltage V

out

Front Panel measurement High Voltage V

out

Front Panel measurement

−

10 mV

−3 mV

out

19.980 V _______V 20.020 V

−9 mV

out

Current Programming and Measurement (High Range)

Low Current I High Current I

out

Front Panel measurement

−

2 mA

4.9955 A _______A 5.0045 A

−10.5 mA

out

Current Measurement (Low Range)

Low Current measurement High Current measurement

−2.5 µA _____µAI

out

−22.5 µA _____µAI

out

Current Sink Measurement

Low Current Sink measurement High Current Sink measurement

−22.5 µA _____µAI

sin

−11.1 mA

sin

Recorded Results Maximum

_______V +10 mV

_____mV V

_______A 2 mA

_____mA I

Specification

+3 mV

out

+9 mV

out

+10.5 mA

out

+2.5 µA

out

+22.5 µA

out

+22.5 µA

sin

+11.1 mA

sin

B - Verification and Calibration

Table B- 5. Verification Test Record for Agilent 6633B

Model Agilent 6633B Report No.____________ Date_____________ Test Description Minimum

Specification

Voltage Programming and Measurement

Low Voltage V

out

Front Panel measurement High Voltage V

out

Front Panel measurement

−

20 mV

−6 mV

out

49.955 V _______V 50.045 V

−21 mV

out

Current Programming and Measurement (High Range)

Low Current I High Current I

out

Front Panel measurement

−

1 mA

1.998 A _______A 2.002 A

−4.25 mA

out

Current Measurement (Low Range)

Low Current measurement High Current measurement

−2.5 µA _____µAI

out

−22.5 µA _____µAI

out

Current Sink Measurement

Low Current Sink measurement High Current Sink measurement

−22.5 µA _____µAI

sin

−4.85 mA

sin

Recorded Results Maximum

Specification

_______V +20 mV

_____mV V

+6 mV

out

+21 mV

out

_______A 1 mA

_____mA I

+4.25 mA

out

+2.5 µA

out

+22.5 µA

out

+22.5 µA

sin

+4.85 mA

sin

Table B- 6. Verification Test Record for Agilent 6634B

Model Agilent 6634B Report No.____________ Date_____________ Test Description Minimum

Specification

Voltage Programming and Measurement

Low Voltage V

out

Front Panel measurement High Voltage V

out

Front Panel measurement

−

50 mV

−12 mV

out

99.90 V _______V 100.10 V

−42 mV

out

Current Programming and Measurement (High Range)

Low Current I High Current I

out

Front Panel measurement

−

0.5 mA

0.999 A _______A 1.001 A

−2.25 mA

out

Current Measurement (Low Range)

Low Current measurement High Current measurement

−2.5 µA _____µAI

out

−22.5 µA _____µAI

out

Current Sink Measurement

Low Current Sink measurement High Current Sink measurement

−22.5 µA _____µAI

sin

−2.85 mA

sin

Recorded Results Maximum

Specification

_______V +50 mV

_____mV V

+12 mV

out

+42 mV

out

_______A 0.5 mA

_____mA I

+2.25 mA

out

+2.5 µA

out

+22.5 µA

out

+22.5 µA

sin

+2.85 mA

sin

Verification and Calibration - B

Performing the Calibration Procedure

NOTE: The calibration procedure can only be performed using the SCPI language commands.

Use either the front panel Address key to access the LANG command, or use the SYSTem:LANGuage command to change the programming language to SCPI.

Table B-1 lists the equipment required for calibration. Figure B-1 shows the test setup. You do not have to do a complete calibration each time. If appropriate, you may calibrate only the

voltage or current and proceed to "Saving the Calibration Constants". However, the voltage or current calibration sequence must be performed in its entirety. The following parameters may be calibrated:

♦ voltage programming and measurement ♦ overvoltage protection (OVP) ♦ current programming and measurement ♦ negative current programming ♦ low range measurement ♦ ac current measurement

Front Panel Calibration Menu

The Entry keypad is used for calibration functions.

CalShift

Press this key to access the calibration menu.

Display Command Function

CAL ON <value> Turns calibration mode on when the correct password

value is entered.

CAL OFF Turns calibration mode off CAL:LEV <char> Advance to next step in sequence (P1 or P2). CAL:DATA <value> Enter an external calibration measurement.

CAL:VOLT Begin voltage calibration sequence CAL:VOLT:PROT Begin voltage protection calibration CAL:CURR Begin high range current calibration sequence CAL:CURR:NEG Begin negative current calibration sequence CAL:CURR:MEAS:LOW Begin low range current measurement calibration CAL:CURR:MEAS:AC Begin ac current calibration sequence CAL:SAVE Saves the calibration constants in non-volatile memory. CAL:PASS <value> Set new calibration password.

Notes:

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

Ë Ì

Use and to scroll through the menu parameters.

É Ê

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

B - Verification and Calibration

Front Panel Calibration

These procedures assume you understand how to operate front panel keys (see chapter 5).

Enable Calibration Mode

Action Display

Reset the unit by selecting Output, scrolling to *RST and pressing Enter.

Press Output On/Off to enable the output.

To begin calibration press Shift Cal, scroll to CAL ON and press Enter.

Enter the calibration password from Entry keypad and press Enter. lf the password is correct the Cal annunciator will come on. If CAL DENIED appears, then an internal switch has been set to prevent the calibration from being changed. (See the Service Manual.) lf the password is incorrect, an error occurs. If the active password is lost, the calibration function can be recovered by setting an internal switch that defeats password protection. (See the Service Manual.)

Voltage Programming and Measurement Calibration

Action Display

5. Connect the DMM (dc volts mode) directly to the dc source. Do not

connect the load resistor or current shunt.

Press Shift Cal, scroll to CAL VOLT, and press Enter.

Press Shift Cal, scroll to CAL LEV, and press Enter to select the first calibration point.

*RST

00.003V 0.0006A CAL ON 0.0

CAL DENIED

OUT OF RANGE

CAL:VOLT

CAL:LEV P1

Press Shift Cal, scroll to CAL DATA, and use the Entry keypad to enter the voltage value displayed on the DMM.

Press Shift Cal, scroll to CAL LEV, use Ì to scroll to P2 (the second calibration point), and press Enter.

10.

Press Shift Cal, scroll to CAL DATA, and use the Entry keypad to enter the second voltage value displayed on the DMM.

Overvoltage Protection Calibration

Action Display

11.

Press Shift Cal, scroll to CAL VOLT PROT, and press Enter.

12. Wait for the dc source to compute the OVP calibration constant. The display returns to Meter mode when the calculation is complete.

CAL:DATA 0.00

CAL:LEV P2

CAL:DATA 0.00

CAL:VOLT:PROT

Verification and Calibration - B

Current Programming and High-Range Measurement Calibration

Action Display

13. Connect the appropriate current monitor as shown in figure B-1A.

Connect the DMM (in dc mode) across the current shunt.

14.

Press Shift Cal, scroll to CAL CURR, and press Enter.

15.

Press Shift Cal, scroll to CAL LEV, and press Enter to select the first calibration point.

16.

Press Shift Cal and scroll to CAL DATA. Wait for the DMM reading to stabilize. Then read the DMM and compute the first current value (DMM reading ÷ shunt resistance). Use the Entry keypad to enter the first current value.

17.

Press Shift Cal, scroll to CAL LEV, use ä to scroll to P2 (the second calibration point), and press Enter.

18.

Press Shift Cal and scroll to CAL DATA. Wait for the DMM reading to stabilize. Then read the DMM and compute the second current value (DMM reading ÷ shunt resistance). Use the Entry keypad to enter the second current value.

Negative Current Programming Calibration

Action Display

19. Connect only an external supply directly to the dc source. Connect the

+ terminal to the + output and the - terminal to the - output. Set the external supply to 1 V, 1 A. The dc source should be in CC mode.

20.

Press Shift Cal, scroll to CAL CURR NEG, and press Enter.

CAL:CURR

CAL:LEV P1

CAL:DATA 0.00

CAL:LEV P2

CAL:DATA 0.00

CAL:CURR:NEG

21. Wait for the dc source to compute the negative current calibration

constant. The display returns to Meter mode when the calculation is complete. Disconnect the external supply.

Low-Range Current Measurement Calibration

Action Display

22.

Press Shift Cal, scroll to CAL CURR MEAS LOW, and press Enter.

23. Connect the UUT as shown in figure B-1B with the appropriate load

resistor for your model. Set the DMM to operate in current mode.

24.

Press Shift Cal, scroll to CAL LEV, and press Enter to select the first calibration point.

25.

Press Shift Cal and scroll to CAL DATA. Wait for the DMM reading to stabilize. Then use the Entry keypad and enter the current reading displayed on the DMM.

CAL:CURR:MEAS:LOW

CAL:LEV P1

CAL:DATA 0.00

B - Verification and Calibration

AC Current Measurement Calibration (Agilent 66332A only)

Action Display

26. Disconnect all loads from the dc source. Make sure the mode switch on the rear panel is set to Normal.

27.

Press Shift Cal, scroll to CAL CURR MEAS AC, and press Enter.

28. Wait for the dc source to compute the ac current calibration constant. The display returns to Meter mode when the calculation is complete.

CAL:CURR:MEAS AC

Saving the Calibration Constants

WARNING: Storing calibration constants overwrites the existing ones in non-volatile memory. If you

are not sure you want to permanently store the new constants, omit this step. The dc source calibration will then remain unchanged.

Action Display

29.

Press Shift Cal, scroll to CAL SAVE, and press Enter.

30.

Press Shift Cal, select CAL OFF, and press Enter to exit Calibration mode. *RST and *RCL will also set the calibration state to OFF.

CAL:SAVE

CAL OFF

Calibration Error Messages

Errors that can occur during calibration are shown in the following table.

Table B- 7. GPIB Calibration Error Messages

Error Meaning

401 CAL switch prevents calibration (This is a hardware disable, see the Service Manual.) 402 CAL password is incorrect 403 CAL not enabled 404 Computed readback cal constants are incorrect 405 Computed programming cal constants are incorrect 406 Incorrect sequence of calibration commands

Verification and Calibration - B

Changing the Calibration Password

The factory default password is 0. You can change the password when the dc source is in calibration mode (which requires you to enter the existing password). Proceed as follows:

Action Display

Begin by pressing Shift Cal and scrolling to the CAL ON command.

Enter the existing password from Entry keypad and press Enter

Press Shift Cal and scroll to the CAL PASS command.

4. Enter the new password from the keypad. You can use any number with up to six digits and an optional decimal point. If you want the calibration function to operate without requiring any password, change the password to 0 (zero).

CAL ON 0.0

CAL:PASS 0

NOTE: If you want the calibration function to operate without requiring any password, change

the password to 0 (zero).

Calibration Over the GPIB

You can calibrate the dc source by using SCPI commands within your controller programming statements. Be sure you are familiar with calibration from the front panel before you calibrate from a controller. Each front panel calibration command has a corresponding SCPI command. When you write your calibration program, perform the calibration procedure in the same order as the front panel procedure documented in this appendix.

The SCPI calibration commands are explained in chapter 3 of the dc source Programming Guide. Calibration error messages that can occur during GPIB calibration are shown in table B-3.

Error Messages

Error Number List

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

♦ Error numbers are displayed on the front panel ♦ Error numbers and messages are read back with the SYSTem:ERRor? query. SYSTem:ERRor?

returns the error number into a variable and returns two parameters: an NR1 and a string.

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

When errors occur, the Standard Event Status register records them in bit 2, 3, 4, or 5 as described in the following table:

Table C-1. Error Numbers

Error Number

–100 Command error [generic] –101 Invalid character –102 Syntax error [unrecognized command or data type] –103 Invalid separator –104 Data type error [e.g., "numeric or string expected, got block data"] –105 GET not allowed –108 Parameter not allowed [too many parameters] –109 Missing parameter [too few parameters] –112 Program mnemonic too long [maximum 12 characters] –113 Undefined header [operation not allowed for this device] –121 Invalid character in number [includes "9" in octal data, etc.] –123 Numeric overflow [exponent too large; exponent magnitude >32 k] –124 Too many digits [number too long; more than 255 digits received] –128 Numeric data not allowed

Error String [Description/Explanation/Examples]

Command Errors –100 through –199 (sets Standard Event Status Register bit #5)

–131 Invalid suffix [unrecognized units, or units not appropriate]

C - Error Messages

–138 Suffix not allowed –141 Invalid character data [bad character, or unrecognized] –144 Character data too long –148 Character data not allowed –150 String data error –151 Invalid string data [e.g., END received before close quote] –158 String data not allowed –160 Block data error –161 Invalid block data [e.g., END received before length satisfied] –168 Block data not allowed –170 Expression error –171 Invalid expression –178 Expression data not allowed

Execution Errors –200 through –299 (sets Standard Event Status Register bit #4)

–200 Execution error [generic] –222 Data out of range [e.g., too large for this device] –223 Too much data [out of memory; block, string, or expression too long] –224 Illegal parameter value [device-specific] –225 Out of memory –270 Macro error –272 Macro execution error –273 Illegal macro label –276 Macro recursion error –277 Macro redefinition not allowed

System Errors –300 through –399 (sets Standard Event Status Register bit #3)

–310 System error [generic] –350 Too many errors [errors beyond 9 lost due to queue overflow]

Query Errors –400 through –499 (sets Standard Event Status Register bit #2)

–400 Query error [generic] –410 Query INTERRUPTED [query followed by DAB or GET before response complete] –420 Query UNTERMINATED [addressed to talk, incomplete programming message received] –430 Query DEADLOCKED [too many queries in command string] –440 Query UNTERMINATED [after indefinite response]

Selftest Errors 0 through 99 (sets Standard Event Status Register bit #3)

0 No error 1 Non-volatile RAM RD0 section checksum failed 2 Non-volatile RAM CONFIG section checksum failed 3 Non-volatile RAM CAL section checksum failed 4 Non-volatile RAM STATE section checksum failed 5 Non-volatile RST section checksum failed 10 RAM selftest 11 VDAC/IDAC selftest 1 12 VDAC/IDAC selftest 2 13 VDAC/IDAC selftest 3 14 VDAC/IDAC selftest 4 15 OVDAC selftest 80 Digital I/O selftest error

Device-Dependent Errors 100 through 32767 (sets Standard Event Status Register bit #3)

Error Messages - C

213 Ingrd receiver buffer overrun 216 RS-232 receiver framing error 217 RS-232 receiver parity error 218 RS-232 receiver overrun error 220 Front panel uart overrun 221 Front panel uart framing 222 Front panel uart parity 223 Front panel buffer overrun 224 Front panel timeout 401 CAL switch prevents calibration 402 CAL password is incorrect 403 CAL not enabled 404 Computed readback cal constants are incorrect 405 Computed programming cal constants are incorrect 406 Incorrect sequence of calibration commands 407 CV or CC status is incorrect for this command 408 Output mode switch must be in NORMAL position 601 Too many sweep points 602 Command only applies to RS-232 interface 603 CURRent or VOLTage fetch incompatible with last acquisition 604 Measurement overrange

Line Voltage Conversion

WARNING: Shock Hazard Operating personnel must not remove instrument covers.

Component replacement and internal adjustments must be made only by qualified service personnel.

Open the Unit

♦ Turn off ac power and disconnect the power cord from the unit. ♦ Remove the four screws that secure the cover (use a #2 Pozi drive). ♦ Slightly spread the bottom of the cover and pull it back to remove it from the unit.

Configure the Power Transformer

♦ Locate the ac input wiring harness on the left side of the transformer. ♦ Use a needlenose pliers and connect the ac input wiring harness according to the information in the

following figure:

white/red/grey

spare

jumper

white/red/grey

grey

white/red/grey

jumper

grey

white/red/grey

jumper

Figure D-1, Power Transformer AC Input Connections

grey

D - Line Voltage Conversion

Install the Correct Line Fuse

♦ Unscrew the line fuse cap from the rear panel and install the correct fuse.

For 100/120 Vac operation: F4A; part number 2110-0055 For 220/230 Vac operation: F2A; part number 2110-0002

♦ Mark the voltage setting that the unit has been set to on the rear panel label.

Close the Unit

♦ Replace the outer cover.

♦ Reconnect the power cord and turn on the unit.

List of Fuses

F500 2110-0055 1 Fuse, F4A, 250V (for 100/120 Vac input)

F500 2110-0002 1 Fuse, F2A, 250V (for 220/230 Vac input)

F300 2110-0712 1 Fuse, sub-min, M4A, 125V F301 2110-0712 1 Fuse, sub-min, M4A, 125V F302 2110-0697 1 Fuse, sub-min, M15A, 32V (66332A, 6632B, 6633B) F302 2110-0685 1 Fuse, sub-min, M7A, 125V (6634B) F303 2110-0697 1 Fuse, sub-min, M15A, 32V (66332A, 6632B, 6633B) F303 2110-0685 1 Fuse, sub-min, M7A, 125V (6634B) F304 2110-0699 1 Fuse, sub-min, M5A, 125V F305 2110-0777 1 Fuse, M8A, 32V (66332A, 6632B, 6633B)

F305 0811-3776 1 Res Fusible 0.5 Ohm 5W (6634B)

F310 2110-0025 1 Fuse, M15A, 32V (6631B)

Index

— —

-- -- -- -- -- --, 43

—+—

+/- terminals, 23 +S/-S terminals, 23

—0—

0 ... 9, 41

—A—

ac line conversion, 69 accessories, 18 ACDC current detector, 44 airflow, 22 annunciators

Addr, 36 Cal, 36 CC, 36 CV, 36 Dis, 36 Err, 36 OCP, 36 Prot, 36 Rmt, 36 Shift, 36 SRQ, 36 Unr, 36

AWG ratings, 23

—C—

cables, 18 calibration, 59

current programming - high range, 61 current programming - low range, 61 enable, 60 equipment, 53 error messages, 62 menu, 59 OVP, 60 password, 63 peak current, 62 saving, 62 setup, 53 voltage measurement, 60

voltage programming, 60 capacitive loading, 27 capacitor discharge limit, 26 CC mode, 42 checkout procedure, 32

cleaning, 21 clear protection, 43 controller connections, 30 controls and indicators, 19 conversion, ac line, 69 crowbar circuit, 26 current measurement range, 43 CV mode, 20, 42

—D—

damage, 21 DC current detector, 44 DFI signal, 28 DIGIO, 45 digital connector, 21, 28 digital I/O, 28 digital output port, 45 dimensions, 22 disabling multiple units, 28

—E—

enable output, 42 enter value, 42 entry keys, 41

, 41 0 ... 9, 41 Backspace, 41 Clear Entry, 41 Enter Number, 41

error messages, 34 error numbers, 65

—F—

fast mode, 27 features, 19 FLT, 45 FLT output, 28 front panel, 19, 35

annuncuiators, 36 connections, 23 controls and indicators, 35 keys, 36

FS, 38, 43 FS status, 26 function keys, 38

p, 38 Cal, 40 Current, 40 immediate action, 38 Input, 39 Meter, 39 OCP, 38 Output, 40

Index

Output On/Off, 38 OV, 40 Prot Clear, 38 Protect, 40 Voltage, 40

fuses, 23

ground, earth, 18 guide, programming, 17

guide, user’s, 17

history, 6 GPIB, 46

address, 46 connections, 30 interface, 30

inductive loading, 27 INH, 45 INH input, 28 input

connections, 23 power, 18

inspection, 21

line fuse

replacing, 34 line voltage conversion, 69 load line, 20 load voltage drops, 24 location, 22

—M—

making measurements, 43 manuals, 21 measurement ranges, 43 multiple loads, 24

non-volatile memory

clearing, 47

storing, 37, 40 normal mode, 27

—G—

—H—

—I—

—L—

—N—

OT, 43 output

characteristic, 20 connections, 23 connector, 21 control keys, 40 current setting, 42 enable, 42 rating, 20

voltage setting, 42 output relay, 46 OV, 43 OVLD, 34, 43 OVP

capacitor discharge limit, 26

circuit, 26

—P—

power cord, 21, 23 power receptacle, 18 preliminary checkout, 31 print date, 6 protection

FS, 43

OC, 43

OT, 43

OV, 43

RI, 43

—Q—

query protection, 43

—R—

rack mount kit, 18 rack mounting, 22 rear panel

connections, 28, 30 recalling operating states, 47 remote programming, 19 remote sensing, 25

stability, 26 repacking, 21 RI, 43

signal, 28 RIDFI, 45 RS-232, 46

connections, 30

interface, 30

—S—

OC, 43 operating features, 19 option 760, 46 options, 18

—O—

safety class, 18 safety warning, 18 saving operating states, 47 selftest errors, 34 sense connections, 25 service guide, 18

Index

setting voltage/current, 42 shift annunciator, 31 shift key, 31 shorting switch, 28 specifications, 49 stability with remote sensing, 26 supplemental characteristics, 50 system errors, 65 system keys, 37

Address, 37 Error, 37 Interface, 37 Local, 37 RCL, 37 Save, 37 Shift, 37

—T—

turn-on checkout, 31, 55

—V—

verification

current measurement accuracy, 55

current programming, 55

equipment, 53

setup, 53

test record, 57

voltage measurement accuracy, 55

voltage programming, 55 verification tests, 31

—W—

warranty, 2 wire

current ratings, 23 wiring considerations, 23

Agilent Sales and Support Office

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Technical data is subject to change.

Manual Updates

The following updates have been made to this manual since the November 1997 printing indicated on the Printing History page.

7/8/99

Additional information about CV mode operation has been added to page 20.

A note has been added to Table A-1 for the Ripple and Noise specifications and a correction has been made for Model Agilent 6631B.

Steps 22 and 23 on page 61 under Low Range Current Measurement Calibration have been switched.

1/7/00

All references to HP have been changed to Agilent.

All references to HP-IB have been changed to GPIB.

A note about magnetic fields has been added to page 22.

On page 49 the model reference for note 2 has been corrected.

2/21/01

A note has been added to Table A-1 for the Programming Accuracy specification.

Information about Option 760 has been added to Table A-1, note 5

The values for Average Programming Resolution, Current in table A-2 have been adjusted.

5/01/02

Step 19 on page 56 under Negative Current Programming Calibration has been corrected.

10/2/03

The Ripple and Noise specification for Model 6634B has changed in table A-1.

3/9/04

The ac input ratings and fuse information has been updated as per IEC 61010-1 requirements throughout the manual.

The Declaration of Conformity has been updated on page 5.

Agilent 6634B Operations Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Warranty Information

Safety Summary

Acoustic Noise Information

Table of Contents

Quick Reference

The Front Panel - At a Glance

Front Panel Number Entry

Front Panel Annunciators

Immediate Action Keys

Front Panel Menus - At a Glance

SCPI Programming Commands - At a Glance

The Rear Panel - At a Glance

General Information

Document Orientation

Options and Accessories

Description

Installation

Inspection

Location

Input Connections

Output Connections

OVP Considerations

Fast/Normal Operation

Controller Connections

Turn-On Checkout

Introduction

Using the Keypad

Checkout Procedure

In Case of Trouble

Front panel Operation

Introduction

Front Panel Description

System Keys

Function Keys

Entry Keys

Examples of Front Panel Programming

Specifications

Specifications

Supplemental Characteristics

Verification and Calibration

Introduction

Performing the Verification Tests

Performing the Calibration Procedure

Calibration Error Messages

Changing the Calibration Password

Calibration Over the GPIB

Error Messages

Line Voltage Conversion

Index

Agilent Sales and Support Office

Manual Updates