Agilent 6811B Users Guide

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User's Guide

AC Power Solutions

HP Models 6811B, 6812B, and 6813B

For instruments with Serial Numbers:

HP 6811B: US38390101-up HP 6812B: US38390101-up HP 6813B: US38390101-up

HP Part No. 5962-0829 Printed in U.S.A. Microfiche No 5962-0830 December, 1998

Warranty Information

CERTIFICATION

Hewlett-Packard Company certifies that this product met its published specifications at time of shipment from the factory. Hewlett-Packard 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 Hewlett-Packard hardware product is warranted against defects in material and workmanship for a period of three years from date of delivery. HP software and firmware products, which are designated by HP 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 Hewlett-Packard Company will, at its option, either repair or replace products which prove to be defective. HP 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 HP. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned to HP for warranty service. Except for products returned to Customer from another country, HP shall pay for return of products to Customer.

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

If HP 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 HP.

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. HP 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. HP 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 Hewlett-Packard Sales and Service office for further information on HP'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 safety

standards of design, manufacture, and intended use of the instrument. Hewlett-Packard Company assumes no

liability for the customer's failure to comply with these requirements.

WARNING: LETHAL VOLTAGES

Ac sources can supply 425 V peak at their output. DEATH on contact may result if the output terminals or circuits connected to the output are touched when power is applied.

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.

ENVIRONMENTAL CONDITONS

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

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

Declaration Page

Manufacturer's Name: Hewlett-Packard Company Manufacturer's Address: 150 Green Pond Road

declares that the Product

Product Name: a) AC Power Source/Analyzer

Model Number(s): a) HP 6811B, 6813B, 6812B, 6811A, 6812A, 6813A

DECLARATION OF CONFORMITY

according to ISO/IEC Guide 22 and EN 45014

Rockaway, New Jersey 07866 U.S.A.

b) Harmonic/Flicker Test System

b) HP 6841A, 6842A

conforms to the following Product Specifications:

Safety: IEC 1010-1:1990+A1(1992) / EN 61010-1:1993

EMC: CISPR 11:1990 / EN 55011:1991 - Group 1 Class A

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

Supplementary Information:

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

New Jersey January 1997 __ __ Location Date Bruce Krueger / Quality Manager

European Contact: Your local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH, Department TRE, Herrenberger Strasse 130, D-71034 Boeblingen (FAX:+49-7031-14-3143)

Acoustic Noise Information

Herstellerbescheinigung

Diese Information steht im Zusammenhang mit den Anforderungen der Maschinenläminformationsverordnung vom 18 Januar 1991.

* Schalldruckpegel Lp <70 dB(A) * Am Arbeitsplatz * Normaler Betrieb * Nach EN 27779 (Typprüfung).

Manufacturer's Declaration

This statement is provided to comply with the requirements of the German Sound Emission Directive, from 18 January 1991.

* Sound Pressure Lp <70 dB(A) * At Operator Position * Normal Operation * According to EN 27779 (Type Test).

Printing History

The edition and current revision of this manual are indicated below. Reprints of this manual containing minor corrections and updates may have the same printing date. Revised editions are identified by a new printing date. A revised edition incorporates all new or corrected material since the previous printing date.

Changes to the manual occurring between revisions are covered by change sheets shipped with the manual. In some cases, the manual change applies only to specific instruments. Instructions provided on the change sheet will indicate if a particular change applies only to certain instruments.

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

Edition 2 _________February, 1997 Edition 3 _________March, 1998 Edition 4 _________December 1998

Warranty Information 2 Safety Summary 3 Declaration of Conformity 5 Acoustic Noise Information 6 Printing History 6 Table of Contents 7

1 GENERAL INFORMATION 11

Document Orientation 11

Earlier AC Source Models 12 Safety Considerations 12

Options and Parts 12 Description 13

Capabilities 14

Front Panel/Remote Operation 14 Steady-state Output Characteristic 15 Peak Current/Dynamic Power Capability 16

Peak Current Limit 16 Peak Inrush Example 16

RMS Current Limit Circuit 18 Voltage Regulation 18

Real Time Regulation 18 RMS Regulation 18

Output Impedance 18 Output Coupling 19

2 INSTALLATION 21

Inspection 21

Damage 21 Packaging Material 21 Items Supplied 21 Cleaning 21

Location 22

Bench Operation 22 Rack Mounting 22

Input Connections 23

Input Source and Line Fuse 23 Installing the Power Cord 23

Output Connections 24

Wire Considerations 25 Voltage Drops 25

Remote Sense Connections 25

Remote Sensing and OVP Considerations 27

Trigger Connections 27 Digital Connections 27 Controller Connections 28

HP-IB Connector 28 RS-232 Interface 29

3 TURN-ON CHECKOUT 31

Introduction 31 Preliminary Checkout 31 Using the Keypad 32 Checkout Procedure 32 In Case of Trouble 34

Error Messages 34 Line Fuse 35

4 FRONT PANEL OPERATION 37

Introduction 37 Front Panel Description 37 System Keys 39 Function Keys 40

Immediate Action Keys 40 Scrolling Keys 40 Meter Display Keys 41 Output Control Keys 42 Protection and Status Control Keys 44 Trigger and List Control Keys 45

Entry Keys 46 Examples of Front Panel Programming 47

1 - Setting the Output Voltage Amplitude 47 2 - Setting the Output Frequency 48 3 - Setting the DC Offset 48 4 - Setting a Protection Feature 49 5 - Clearing Protection Conditions 49 6 - Using Transient Voltage Modes 50 7 - Trigger Delays and Phase Synchronization 53 8 - Using Slew Rates to Generate Waveforms 55 9 - Measuring Peak Inrush Current 57 10 - Setting the HP-IB Address and RS-232 Parameters 58 11 - Saving and Recalling Operating States 58

A SPECIFICATIONS 59

Specifications 59 Supplemental Characteristics 61 Operation Below 45 Hz 63

B VERIFICATION AND CALIBRATION 65

Introduction 65

Equipment Required 65 Test Setup 66

Performing the Verification Tests 67

Turn-On Checkout Procedure 67 AC Voltage Programming and Measurement Accuracy 67 DC Voltage Programming and Measurement Accuracy 68 RMS Current Accuracy Test 68

Performing the Calibration Procedure 71

Front Panel Calibration Menu 71

Front Panel Calibration 72

Enable Calibration Mode 72 Calibrating and Entering Voltage Offset Values 72 Calibrating and Entering DC Voltage Gain Values 73 Calibrating and Entering AC rms Voltage Gain Values 73 Calibrating the OVP Trip Point 74 Calibrating and Entering rms Current Values 74 Calibrating and Entering rms Current Measurement Values 75 Calibrating the Output Impedance 75 Saving the Calibration Constants 75

Changing the Calibration Password 76 Calibration Error Messages 76 Calibration Over the HP-IB 76

HP Calibration Program Listing 76

C ERROR MESSAGES 81

Error Number List 81

D LINE VOLTAGE CONVERSION 85

Open the Unit 85 Check the Jumper Wire (Model HP 6811B/6812B only) 85 Check the Line Jumpers (all Models) 85 Check the Power Transformer Connector (all Models) 85 Close the Unit 86

INDEX 87

General Information

Document Orientation

This manual describes the operation of the HP 6811B/6812B/6813B AC Power Solutions. These units will be referred to as "ac sources" throughout this manual. The following documents are shipped with your ac source:

♦ a Quick-Start Guide, to help you quickly get started using the ac source ♦ a User's Guide, containing detailed installation, checkout, and front panel information ♦ a Programming Guide, containing detailed HP-IB programming information ♦ a Quick Reference Card, designed as a memory jogger for the experienced user

You will find information on the following tasks in these guides. Refer to the table of contents of each guide for a complete list of the topics.

Topic Location

Accessories and Options Chapter 1 - this guide Calibrating the ac source Appendix B - this guide Front panel keys Chapter 4 - this guide Front panel programming examples Chapter 4 - this guide Line voltage connections Chapter 2 - this guide Line voltage ratings Appendix A - this guide Line voltage conversion Appendix D - this guide Operator replaceable parts Chapter 1 - this guide Operator troubleshooting Chapter 3 - this guide Operating characteristics Appendix A - this guide Performance specifications Appendix A - this guide Quick operating checkout Chapter 3 - this guide Rack mounting Chapter 2 - this guide RS-232 operation Chapter 2 - this guide SCPI programming examples Chapter 3 - Programming Guide SCPI programming commands Chapter 4 - Programming Guide Turn-on/checkout Chapter 3 - this guide Wiring - discrete fault indicator (DFI) Chapter 2 - this guide

- HP-IB controller Chapter 2 - this guide

- load or loads Chapter 2 - this guide

- voltage sensing (local and remote) Chapter 2 - this guide

- remote inhibit (RI) Chapter 2 - this guide

1 - General Information

Earlier AC Source Models

With the exception of some minor readback specification differences, information in this manual also applies to the following earlier ac source models:

Information about this

current model

HP 6811B HP 6811A AC Power Source/Analyzer HP 6812B HP 6812A AC Power Source/Analyzer

HP 6813B HP 6813A AC Power Source/Analyzer

also applies to the following earlier models:

HP 6841A Harmonic/Flicker Test System in normal mode

HP 6842A Harmonic/Flicker Test System in normal mode

Safety Considerations

This ac 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 ac 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 Parts

Table 1-1. Options

Option Model Description

0BN All Extra documentation 1CM All Rack mount kit (HP p/n 5062-3977) 1CP All Rack mount kit with handles (HP p/n 5062-3983) 100 HP 6811B/6812B 87-106 Vac, 48-63 Hz (Japan only) 200 HP 6813B 174-106 Vac, 48-63 Hz (Japan only) 230 HP 6811B/6812B 191-254 Vac, 48-63 Hz 831 HP 6812B/6813B 12 AWG, 200 to 240 Vac, unterminated 832 HP 6813B 4-mm2 wire size, unterminated 833 HP 6812B 1.5-mm2 wire size, 200 to 240 Vac, unterminated 834 HP 6812B 10 AWG, 100 to 120 Vac, unterminated 841 HP 6812B/6813B Line cord with NEMA 6-20P; 20A, 250 V plug 842 HP 6813B Line cord with IEC 309; 32A, 220 V plug 844 HP 6813B Line cord with NEMA 6-30P; 30A, 250 V locking plug 845 HP 6812B Line cord with IEC 309; 16 A, 220 V plug 846 HP 6812B Line cord with NEMA L5-30P; 30 A, 120 V plug 847 HP 6812B Line cord with CEE 7/7; 16 A, 220 V plug

848 HP 6812B Line cord with BS 546; 15 A, 240 V plug Support rails (HP p/n 1494-0059) are required when rack mounting units with options 1CM and 1CP. HP 6811B units are shipped with the correct line cord for the destination country.

The following table lists some common user-replaceable parts:

Table 1-2. Operator Replaceable Parts

Item HP Part Number

Power cord assembly see "Options" Rack mount kit see "Options" 4-terminal digital connector plug 1252-1488 Ac input safety cover (with strain relief and bushing) 5040-1676 Screw (3), ac input barrier block (6-32 x 5/16in) N/A Ac output safety cover 5040-1704 Line fuse for HP 6812B (30 A) 2110-0910 Line fuse for HP 6813B (25 A) 2110-0849 Line fuse for HP 6811B (20 A) 2110-0098 Screw (2), ac output safety cover (m4 x 0.7in) 0515-0053 Screw (5), ac output barrier block (6-32 x 5/16 in) N/A User's Guide (this manual) 5962-0829 Programming Guide 5962-0889 Quick Start Guide 5962-0883 Quick Reference Card 5962-0885

General Information - 1

Description

The ac source combines three instruments in one unit as shown in the following figure. The function generator produces waveforms with programmable amplitude, frequency, and shape. The power amplifier amplifies the function generator signal to produce the ac power for your application. The measurement functions range from a simple readback of rms voltage and current, to sophisticated capabilities such as waveform analysis.

DAC

WAVEFORM

GENERATOR

SOURCE

BIPOLAR

AMPLIFIER

shunt

MEASUREMENT

BLOCK

POWERMETER FFT ANALYZER

Figure 1-1. AC Source Functional Elements

1 - General Information

The following model ac power sources are described in this User's Guide:

Model Description

HP 6811B 0-300 V rms; 375 VA (425 V peak; 40 A peak) HP 6812B 0-300 V rms; 750 VA (425 V peak; 40 A peak) HP 6813B 0-300 V rms; 1750 VA (425 V peak; 80 A peak)

Capabilities

♦ Programmable ac voltage, dc voltage, frequency, phase, and current limit. ♦ Sine, square, clipped sine, and user-definable waveforms. ♦ Programmable output impedance. ♦ Voltage and frequency slew control. ♦ Synthesized waveform generation for high resolution and accuracy in frequency, low waveform

distortion, and glitch-free phase transitions.

♦ Step and pulse output transients for generating surge, sag, dropout, and other line disturbance

simulations.

♦ Nonvolatile list programming for generating complex output transients or test sequences. ♦ Nonvolatile state and waveform storage and recall. ♦ Extensive measurement capability:

 Ac rms, dc, ac+dc voltage and current and peak current.  Real, reactive, and apparent power.  Harmonic analysis of voltage and current waveforms gives amplitude, phase, and total

harmonic distortion results up to the 50th harmonic.

 Triggered acquisition of digitized voltage and current with extensive post-acquisition

calculations.

 All measurements made with 16-bit resolution.

♦ Trigger In and Trigger Out for synchronizing transient events or measurements with external

signals.

♦ Front panel control with 14-character vacuum flourescent display, keypad, and rotary pulse

generators for voltage and frequency settings.

♦ Built-in HP-IB and RS-232 interface programming with SCPI command language. ♦ Over-voltage, over-power, over-current, over-temperature, and RI/DFI protection features. ♦ Built-in output and sense disconnect relays. ♦ Output terminals floating with respect to chassis ground. ♦ Extensive selftest, status reporting, and software calibration.

Front Panel/Remote Operation

The front panel has both rotary (RPG) and keypad controls for setting the output voltage and frequency. The panel display provides digital readouts of a number of output measurements. Annunciators display the operating status of the ac source. System keys let you perform system functions such as setting the HP-IB address and recalling operating states. Front panel Function keys access the ac source function menus. Front panel Entry keys let you select and enter parameter values. Refer to chapter 4 for a complete description of the front panel controls.

Remotely programming is accomplished from either the HP-IB bus or from an RS-232 serial port. HP-IB and RS-232 programming uses SCPI commands (Standard Commands for Programmable Instruments) that make the ac source programs compatible with those of other instruments. AC source status registers permit remote monitoring of a wide variety of ac source operating conditions

General Information - 1

Vdc

NOTE: Refer to the ac source Programming Guide for further information about remotely

programming the ac source.

Steady-state Output Characteristic

The ac source's steady-state output characteristic is shown in the following figure. Steady-state characteristics are defined as those output ratings that will be maintained by the ac source for an indefinite time. (The section "Peak Current Capability" describes the dynamic output capability of the unit.) The figure shows both the ac and the dc characteristics. With programmable output coupling, the ac source can supply dc as well as ac output voltages.

Ac source operation is specified from 45 to 1000 Hz (see Appendix A). However, you can operate the unit at frequencies less that 45 Hz. The operating characteristics of the ac source at autput frequencies below 45 Hz are documented in Table A-3 of Appendix A.

300 V

115V (6811B/6812B)

135V (6813B)

424 V

Vrms

1.25A (6811B)

2.5A (6812B)

5.8A (6813B)

375VA (6811B)

750VA (6812B) 1750VA (6813B)

3.25A (6811B)

6.5A (6812B) 13A (6813B)

Irms

-Idc

-2.5A (6811B)

-5A (6812B)

-10A (6813B)

115V (6811B/6812B)

135V (6813B)

-Vdc

AC CHARACTERISTIC

DC CHARACTERISTIC

(45Hz - 1kHz sinewave)

Figure 1-2. Steady-state Output Characteristic (in real-time mode)

285W (6811B)

575W (6812B) 1350W (6813B)

0.67A (6811B) 2.5A (6811B)

1.35A (6812B)

3.17A (6813B)

-424 V

5A (6812B)

10A (6813B)

Idc

1 - General Information

Peak Current/Dynamic Power Capability

The ac source can generate peak currents that exceed the rms current capability of the unit. This not only applies when operating in ac mode, but also when programming output pulses in dc mode. Although the unit will generate peak output currents up to 40A (HP 6811B/6812B) or 80A (HP 6813B), the unit can only maintain this output for a limited time. If the output of the unit exceeds the limit of the safe operating area (SOA), the unit will activate its internal protection mode and turn its output off. This SOA limit is based on output voltage, output current, output duration, and heatsink temperature.

NOTE: Refer to chapter 4 on how to clear the unit when the internal protection mode has been

activated.

Peak Current Limit

By programming the peak current limit, you can prevent the unit from exceeding the safe operating area, activating its internal protection mode, and turning the output off. The peak current limit circuit limits the instantaneous output current. It functions by reducing the instantaneous output voltage to keep the output peak current within the programmed limit. Because the circuit acts instantly, the effect is that it will clip the peaks of the output voltage waveform. Additionally, with fast and/or large voltage transitions, the unit may momentarily go into CC operating mode due to current in the output capacitor. This serves to limit the rate of change of output voltage.

The following table gives approximate indications of how long the unit will tolerate peak output currents before the SOA limits are exceeded. Because these values are voltage dependent, the table includes various equivalent dc voltages along with the peak current values. The voltages shown in the table are NOT the programmed voltages, but the average voltage values that will appear at the output when the indicated high current condition exists. The SOA circuit becomes active at higher voltage and current values as well as at longer duration times.

Table 1-3. Typical Peak Current Output Capacities

HP 6813B HP 6811B equivalent dc voltage when current is flowing

HP 6812B 25 75 125 190 250 360

20 A 10 A >100 ms >100 ms >100 ms >100 ms >100 ms >100 ms 30 A 15 A >100 ms 100 ms 30 ms 24 ms 19 ms 15 ms 40 A 20 A 12 ms 9.2 ms 8.4 ms 7.6 ms 6.8 ms 5.9 ms 50 A 25 A 5.6 ms 5.1 ms 4.7 ms 4.4 ms 4 ms 3.5 ms 60 A 30 A 3.7 ms 3.4 ms 3.1 ms 2.9 ms 2.6 ms 2.3 ms 70 A 35 A 2.6 ms 2.4 ms 2.2 ms 2.1 ms 1.9 ms 1.7 ms 80 A 40 A 2 ms 1.8 ms 1.7 ms 1.6 ms 1.4 ms 1.3 ms

Based on 25C ambient temperature, with heatsink temperature less than 50C.

Peak Inrush Example

The following table gives the recommended initial I 254 Vac 60 Hz sine wave, as a function of load capacitance. The load on the output is a full-wave bridge along with the indicated capacitor. The load resistance across the capacitor is infinite. The recommended I

will change as a function of changes in input as follows:

peak

settings when the ac source output is a 127 Vac or

peak

General Information - 1

♦ as voltage increases, the I ♦ as frequency increases, the I ♦ as load resistance decreases, the I

Note that the purpose of programming the I

setting needs to be decreased.

peak

setting can be increased.

peak

setting needs to be decreased.

peak

current is to prevent the unit from activating its internal

peak

protection mode as a result of exceeding the SOA limits, and turning the output off. These initial settings may have to be reduced if the SOA circuit trips when the output is turned on. Sometimes trial and error must be used to arrive at the proper values of I

Table 1-4. Recommended I

peak

Capacitance in µF

peak

Settings as a Function of Loop Capacitance

setting

peak

127 V 254 V

≤ 1100

500 80 A 1200 - 60 A 1700 700 50 A 5000 1000 45 A

> 5000 > 1000 < 45 A

The following waveform illustrates the inrush current capability of the ac source. The peak current is limited during inrush in accord with table 1-3 to keep the ac source from turning its output off. Note that the output current waveform returns to its normal shape when the current drops below the peak current limit setting.

I PEAK=45A

VOLTAGE IS

UNDISTORTED

(115 Vrms)

CURRENT WAVEFORM

VOLTAGE WAVEFORM

PEAK CURRENT

< 45 A

Figure 1-3. Peak Inrush Current Example

1 - General Information

RMS Current Limit Circuit

The output rms current limit is adjustable to any value within the range of the unit. If the load attempts to draw more current than the programmed limit, the output voltage is reduced to keep the rms current within the limit. When the output voltage is reduced, the waveform shape is preserved. In other words, all parts of the voltage cycle are reduced -- not just the peaks.

NOTE: The speed at which the rms current circuit operates depends on the output voltage setting

and the load impedance. The circuit responds more slowly at low output voltages and at high output impedances. With constant power or negative resistance loads, the rms current limit circuit causes the output voltage to go to zero.

Voltage Regulation

Real Time Regulation

The default method of output regulation used by the ac source is real-time voltage regulation. Real-time voltage regulation tries to provide the actual programmed waveform at the output of the ac source. It offers the best overall programming response and fastest settling times. It does not have any limitations for waveforms and transients with frequency content below 45 Hz.

RMS Regulation

Rms voltage regulation assists real-time regulation to level out or stabilize the rms value of the ac component of the output voltage. Use rms voltage regulation in the following situations:

♦ If you experience load regulation effects with heavy loads. ♦ If you experience frequency regulation problems with heavy loads and you require flatter

programming accuracy at higher frequencies.

♦ In conjunction with programmable output impedance, if you wish to maintain the rms level of

output voltage as the source impedance is increases. (Refer to Output Impedance for more information.)

The command to specify voltage regulation is VOLT:ALC:DET RTIM | RMS. NOTE: Do not use rms voltage regulation when operating at frequencies less than 45 Hz.

Output Impedance

You can program the real and/or reactive (resistive and/or inductive) part of the output impedance of the ac source. Inductive output impedances can be programmed in the range of 20 to 1000 microhenries. Resistive load impedances can be programmed in the range of 0 to 1 ohms.

When programming output impedances, the lower your load impedance, the LESS programmed impedance you can use and still maintain output voltage stability. This applies particularly for load impedances less than 1 ohm.

General Information - 1

CAUTION: Programming the ac source output impedance into a load with a low impedance can

cause output voltage instability, which may damage the ac source. Stability MUST be maintained when operating the ac source with programmable resistance or inductance.

To check for stability, monitor the output voltage with an oscilloscope. Instability exists if a 5kHz to 20kHz oscillation, which is dependent upon the ac source's programmed inductance and the capacitance of the load, is present at any time during the following procedure.

1. When programming inductance, it is recommended that you first add a series resistance either by programming the output resistance to 1 ohm or by adding an equivalent external resistor.

2. Slowly program the inductance to the desired level while monitoring the output for any voltage instability. Do not proceed any further if the output shows any signs of instability.

3. If less output resistance is required, slowly start lowering the resistance while monitoring the output for any voltage instability. Do not proceed any further if the output shows any signs of instability.

If you cannot achieve satisfactory results with this procedure, disable the output impedance control and use an external impedance network.

Rms voltage regulation can be used in conjunction with programmable output impedance to regulate the rms value of the ac component of the output voltage when programmed impedances cause distortion with nonlinear loads or reduced output voltage due to regulation effects.

Note that real-time voltage regulation will permit the load current to cause output voltage degradation based on the programmed impedance and current drawn from the source, whereas rms regulation will reestablish the rms value at the programmed level.

Output Coupling

Ac output coupling mode mimics a transformer-coupled output, working to maintain zero average output voltage. This means that the output tries to remove any dc content on the output, whether the dc content is generated from a programmed offset or results from transients with dc content. The ac output coupling has a corner frequency of about 2 Hz, which will not prevent transient waveforms that may have short-term dc content, but will regulate the waveform back to an average value of zero volts in the steady state.

Dc output coupling mode is used to generate dc offset voltages or output transients that have net dc components. In either mode of operation, the maximum voltage that the ac source can output is limited to 425 V peak.

The ac capability of the output is limited by VA (volt-amperes) rather than power (watts). The amount of VA available to a load can be determined by examining figure 1-2. Full output VA is available with no limitations except for the boundaries imposed by the maximum rms voltage of 300V, and the maximum rms current, which is model-dependent. Note that large peak power transients can be delivered by the ac source as earlier described under "Peak Current Capability"(Appendix A documents the ac source's specifications and supplemental characteristics.)

Installation

Inspection

Damage

When you receive your ac source, inspect it for any obvious damage that may have occurred during shipment. If there is damage, notify the shipping carrier and the nearest HP Sales and Support Office immediately. The list of HP 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 ac source, save the shipping carton and packing materials in case the unit has to be returned. If you return the ac source for service, attach a tag identifying the model number and the owner. Also include a brief description of the problem.

Items Supplied

Check that the following items are included with your ac source. Some items are installed in the unit.

Power Cord

Digital connector Safety covers

Manuals

Change page

A power cord appropriate for your location. The cord may or may not be terminated in a power plug (see "Options" in chapter 1). If the cord is not included, contact your nearest HP Sales and Support Office (refer to the list at the back of this guide).

4-terminal digital plug that connects to the back of the unit. Ac input cover with strain relief

Ac output cover User’s Guide

Programming Guide Quick Start Guide Quick Reference Card

If applicable, change sheets may be included with this guide. If there are change sheets, make the indicated corrections in this guide.

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.

2 - Installation

Location

Refer to the Safety Summary page at the beginning of this manual for safety-related information about environmental conditions.

CAUTION: HP 6811B/6812B units weigh 28.2 kg (62 lbs).

HP 6813B units weigh 32.7 kg (72 lbs). Obtain adequate help when moving or mounting the unit in the rack.

Bench Operation

The outline diagram in figure 2-1 gives the dimensions of your ac source. The feet may be removed for rack mounting. Your ac source must be installed in a location that allows sufficient space at the sides and back of the unit for adequate air circulation. Minimum clearances are 1 inch (25 mm) along the sides. Do

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

Rack Mounting

The ac source can be mounted in a standard 19-inch rack panel or cabinet. Rack mounting kits are available as Option 1CM or 1CP. Installation instructions are included with each rack mounting kit. HP ac sources also require instrument support rails in addition to the rack mount kit. Support rails are normally ordered with the cabinet and are not included with the rack mounting kits.

12.7mm

0.5"

REAR

128mm

5.04"

50.8mm

2.0"

TOP

574.7mm

22.6"

SIDE

425.5mm

16.75"

132.6mm

5.25"

Figure 2-1. Outline Diagram

Installation - 2

(HP 6811A)

Input Connections

Input Source and Line Fuse

You can operate your ac source from a single-phase ac power source as indicated on the rear panel Line Rating label. See "ac Input Voltage Range" in Table A-2 of Appendix A for details.

NOTE: The power ac source must be on a dedicated line with no other devices consuming current

from it.

The line fuse is located inside the ac source. Refer to "In case of Trouble" in Chapter 3 for instructions on fuse replacement.

Installing the Power Cord

The power cord supplied with the ac source may or may not include a power plug at one end of the cord. Figure 2-2 shows the various power plugs. Terminating connections are attached to the other end of the cord.

Option 841

8120-8605 (HP 6811A)

Option 842

8120-8106

Option 831,832,833,834

Option 844

8120-8607

8120-8609

#8 Ring Terminals

Option 846Option 845

8120-8610 (HP 6811A)

Option 847

8120-8608 (HP 6811A)

Option 848

8120-8611

Figure 2-2. Power Cord Plug Configurations

WARNING: Installation of the power cord must be done by a qualified and licensed electrician and

must be in accordance with local electrical codes.

See Figure 2-3 while performing the following procedure. a. If they are not already in place, position the strain relief connector (9), safety cover (5), rubber

boot (8) and connector nut (7) on the power cord (6). b. Secure the ground wire (2) to the chassis earth ground stud. c. Connect the neutral wire (1) to the N power input terminal. d. Connect the line (3) to the L1 power input terminal. e. Position the safety cover over the power input terminals and tighten the cover and strain relief

connector screws.

2 - Installation

L1 L2(N)

1. GROUND CONNECTION (GRN/YEL OR GRN)

2. LINE CONNECTION (BROWN OR BLACK)

3. NEUTRAL CONNECTION (BLUE OR WHITE)

4. POWER CORD

5. CONNECTOR NUT

6. RUBBER BOOT

7. POWER SAFETY COVER

8. STRAIN RELIEF CONNECTOR

Figure 2-3. Connecting the Power Cord

Output Connections

The power output terminal block has a floating output terminal connection and a floating neutral line for the return connection. A separate earth ground terminal is located on the extreme right of the terminal block.

SENSE

01 01 COM COM

300 VAC MAX TO

01 PHASE 1 OUTPUT CONNECTION

COM PHASE RETURN CONNECTION

GROUND CONNECTION

Figure 2-4. Output Connections

Installation - 2

Wire Considerations

NOTE: 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 ac 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 ac source.

Table 2-1 lists the characteristics of AWG (American Wire Gage) copper wire.

Table 2-1. Ampacity and Resistance of Stranded Copper Conductors

AWG No. Ampacity

14 25 0.0103 6 80 0.0016 12 30 0.0065 4 105 0.0010 10 40 0.0041 2 140 0.00064

8 60 0.0025 1/0 195 0.00040

1. Ampacity is based on 30°C ambient temperature with conductor rated at 60°C. For ambient temperature other than 30°C, multiply the above ampacities by the following constants:

Temp. (°C)

21-25 1.08 41-45 0.71 26-30 1.00 46-50 0.58 31-35 0.91 51-55 0.41 36-40 0.82

2. Resistance is nominal at 75 °C wire temperature.

Resistance

(Ω/m)

Constant

NOTES:

AWG No. Ampacity

Temp. (°C) Temp. (°C)

Resistance

(Ω/m)

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. Refer to Table 2-1 to calculate the voltage drop for some commonly used AWG copper wire. If load regulation becomes a problem refer to the section "Remote Sense Connections".

Remote Sense Connections

Under normal operation, the ac 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. As shown in the following figure:

2 - Installation

♦ Connect the phase 1 (1) sense terminals to the side of the load that connects to the corresponding

output terminal.

♦ Connect the Neutral (COM) sense terminal connector to the neutral side of the load. ♦ Twist and shield all signal wires to and from the sense connectors.

The sense leads are part of the ac source's feedback path and must be kept at a low resistance in order to maintain optimal performance. Connect the sense leads carefully so that they do not become open-circuited.

CAUTION: If the sense leads are left unconnected or become open during operation, the ac source will

regulate at the output terminals, but with a 40% increase in output voltage over the programmed limit. The meter circuit cannot read back this increase in output voltage when the sense lead is disconnected.

Set the ALC command to EXT (external) to enable remote sensing. The ALC command is located under the Voltage key as explained in chapter 4. Set the ALC command to INT (internal) to disable remote sensing.

NOTE: If you are using external relays to connect and disconnect the load and sense connections,

do NOT permit the sense connections to open when remote sensing is enabled. First disable remote sensing, then open the sense and load connections.

SENSE

Figure 2-5. Remote Sense Connections

LOAD

COM COM

Installation - 2

Remote Sensing and OVP Considerations

In remote sense applications, the voltage drop in the load leads subtracts from the available load voltage (see "Remote Sensing Capability" in appendix A). As the ac source increases its output to overcome this voltage drop, the sum of the programmed voltage and the load-lead drop may exceed the ac source's maximum voltage rating. This may trip the OV protection circuit, which senses the voltage at the output terminals, not 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.

NOTE: If the load causes the peak current limit circuit to become active, voltage transitions on the

output may cause nuisance tripping of the OVP circuit.

Trigger Connections

The BNC trigger connectors on the rear panel let you apply trigger signals to the ac source as well as generate trigger signals from the ac source. The electrical characteristics of the trigger connectors are described in appendix A. More information on programming external triggers is found in chapter 4 of the ac source Programming Guide.

Trigger IN Allows negative-going external trigger signals to trigger the ac source. Trigger OUT Generates a negative-going pulse when the selected transient output has occurred.

Digital Connections

This connector, which is on the rear panel, is for connecting the fault and the inhibit signals. The fault (FLT) signal is also referred to as the DFI signal in the front panel and SCPI commands. The inhibit (INH) signal is also referred to as the RI signal in the front panel and SCPI commands.

The connector accepts wires sizes from AWG 22 to AWG 12. Disconnect the mating plug to make your wire connections. The electrical characteristics of the digital connectors are described in appendix A. More information on programming the digital connectors is found in chapter 4 of the ac source Programming Guide.

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

connectors

The following examples show how you can connect the FLT/INH circuits of the ac source. In example A, the INH input connects to a switch that shorts pin + to pin ⊥ whenever it is necessary to

disable output of the unit. This activates the remote inhibit (RI) circuit, which turns off the ac output. The front panel Prot annunciator comes on and the RI bit is set in the Questionable Status Event register. To reenable the unit, first open the connection between pins + and ⊥ and then clear the protection circuit. This can be done either from the front panel or over the HP-IB/RS-232.

2 - Installation

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.

FLT INH

NOTE: Connectors

are removable

FLT INH

INH Common

Switch

(Normally

Open)

INH Input

A) INH Example with One Unit

Figure 2-6. FLT/INH Examples

. . . .

INH Input

FLT Output

B) FLT Example with Multiple Units

. . . .

Controller Connections

The ac source connects to a controller either through an HP-IB or an RS-232 connector.

HP-IB Connector

Each ac source has its own HP-IB bus address. AC sources may be connected to the bus in series configuration, star configuration, or a combination of the two. You may connect from 1 to 15 ac sources to a controller HP-IB interface.

NOTE: The ac source is shipped from the factory with its HP-IB address set to 5. This address can

be changed as described in chapter 4 of this guide.

Installation - 2

RS-232 Interface

The ac source provides an RS-232 programming interface, which is activated by commands located under the front panel Address key. When the RS-232 interface is selected, the HP-IB interface is disabled.

NOTE: Sending or receiving data over the RS-232 interface when not configured for REMOTE

operation can cause unpredictable results. Always make sure the ac source is configured for remote operation when using the RS-232 interface.

Interface Commands

All SCPI commands are available through RS-232 programming. The SYSTem:LOCal, SYSTem:REMote, and SYSTem:RWLock commands are only available through the RS-232 interface.

SYSTem:LOCal Places the ac source in local mode during RS-232 operation.The front panel keys

are functional.

SYSTem:REMote Places the ac source in remote mode during RS-232 operation. All front panel

keys except the LOCAL key are disabled.

SYSTem:RWLock Places the ac source in remote mode during RS-232 operation. All front panel

keys including the LOCAL key are disabled.

RS-232 Data Format

♦ constant 11-bit data format ♦ one start bit ♦ seven data bits plus a parity bit (even or odd parity), or eight data bits without parity (parity bit is

"0")

♦ two stop bits

You can specify one of the following baud rates: 300 600 1200 2400 4800 9600

NOTE: The ac source always uses one start bit and two stop bits regardless of the baud rate. The

number of start and stop bits is not programmable.

RS-232 Connector

The RS-232 connector is a DB-9, male connector. You can connect the ac source to any computer or terminal with a properly configured DB-25 connector. You can use a standard HP 24542G or 24542H interface cable.

Table 2-2. RS-232 Connector

1 2 3 4 5

6 7 8 9

1 2 3 4 5 6 7 8 9

Input/Output

Output

Input Output Output

Common

Input

Output

Description

Reserved for service use Receive Data (RxD) Transmit Data (TxD) Data Terminal Ready (DTR) Signal ground Data Set Ready (DSR) no connection no connection Reserved for service use

2 - Installation

Hardware Handshake

The RS-232 interface uses the DTR (data terminal ready) line as a holdoff signal to the bus controller. When DTR is true, the bus controller may send data to the ac source. When DTR goes false, the bus controller must stop sending data within 10 characters, and must not send any more data until DTR goes true again. The ac source sets DTR false under two conditions.

1. When the input buffer is full (approximately 100 characters have been received), it will set DTR false. When enough characters have been removed to make space in the input buffer, DTR will be set to true, unless condition 2 (see below) prevents this.

2. When the ac source wants to "talk", which means that it has processed a query, and has seen a <newline> message terminator, it will set DTR false. This implies that once a query has been sent to the power source, the bus controller should read the response before attempting to send more data. It also means that a <newline> must terminate the command string. After the response has been output, the ac source will set DTR true again, unless condition #1 prevents this.

The ac source monitors the DSR (data set ready) line to determine when the bus controller is ready to accept data. It checks this line before each character is sent, and the output is suspended if DSR is false. When DSR goes true, transmission will resume. The ac source will leave DTR false while output is suspended. A form of deadlock exists until the bus controller asserts DSR true to allow the ac source to complete the transmission.

Control-C is the equivalent to the HP-IB device clear command. It clears the operation in progress and discards any pending output. For the control-C character to be recognized by the power source while it holds DTR false, the bus controller must first set DSR false.

Null modem RS-232 interface cables swap the DTR and DSR lines as shown in the following figure. For other bus controllers or languages, you must determine what form of hardware handshake is used. You may have to build a customized cable to connect the holdoff lines as necessary. If your bus controller does not use hardware handshaking, tie the DSR input to the ac source to a signal that is always true. This implies that your bus controller must always be ready to accept data. You may want to set the baud rate to either 2400 or 4800 baud to ensure that this is true.

bus controller

TxD (3)

RxD (2) *DTR (4) *DSR (6)

Ground (5)

ac source

TxD (3)

RxD (2) DTR (4) DSR (6)

Ground (5)

Figure 2-7. Null Modem Interface Lines

Response Data Terminator

All RS-232 response data sent by the ac source is terminated by the ASCII character pair <carriage return><newline>. This differs from HP-IB response data which is terminated by the single character <newline>.

Turn-On Checkout

Introduction

Successful tests in this chapter provide a high degree of confidence that the ac 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 ac source front panel. See chapter

4 for more details.

Preliminary Checkout

WARNING: LETHAL VOLTAGES. Ac sources can supply 425 V peak at their output. DEATH on

contact may result if the output terminals or circuits connected to the output are touched when power is applied.

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

2. Turn the front panel power switch to ON (1).

3. The ac source undergoes a self-test when you turn it on. The following items appear on the display:

a. A brief pattern that lights all display segments, followed by the model number and the software revision number.

b. The display then goes into the meter mode with the Dis annunciator on, and all others off. "Meter mode" means that the VOLTS digits indicate the output voltage and the FREQ digits indicate the output frequency. The voltage will be at or near zero and the frequency will be at 60 Hertz.

Note: If the ac source detects an error during self-test, the Err anunciator on the display will be lit. Pressing the Shift and Error keys will show the error number. Go to "In Case of Trouble" at the end of this chapter.

4. Check that the ac source fan is on. You should be able to hear the fan and feel the air coming from the unit.

5. Press Output on/off once. The Dis annunciator will go off and the CV annunciator will go on.

6. Turn the unit off.

3 - Turn-On Checkout

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

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

Enter

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

äã

command. If the command has a numeric range, these keys increment or decrement the existing value.

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 Å. 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 ac source. After pressing Enter, the ac source returns to Meter mode in most cases. In Harmonic or List mode, the ac source displays the next point in the list.

Checkout Procedure

WARNING: LETHAL VOLTAGES. Ac sources can supply 425 V peak at their output. DEATH on

contact may result if the output terminals or circuits connected to the output are touched when power is applied.

The output test requires that you connect light bulbs to the output of the unit and apply a potentially hazardous voltage of 120 Vac. Properly shield all connections and wires.

The test in this section checks for output voltage and current on the ac source by having you connect light bulbs to the output of the unit. The following equipment is recommended for performing this output checkout procedure:

♦ 1 - 100 W light bulb ♦ 1 - light bulb socket ♦ wires for connecting socket to the unit

NOTE: When the ac source is turned on as shipped from the factory, it asserts the *RST state.

You can subsequently program the unit to turn on according to the state stored in *RCL location 0, as explained in chapter 4. The following procedures assume that the unit turns on in the *RST state.

Turn-On Checkout - 3

Make sure that the unit is turned off, and make the following connections to the output.

SENSE

01 01 COM COM

100 W

Figure 3-1.Verification Connections

Procedure Display Explanation

1. Turn the unit on. Meter mode

Press the Voltage key.

Press 1, 2, 0, Enter

Press Output On/Off

Press Protect

6. Press • or ‚ and

VOLT 0.00 Display indicates the default settings.

VOLT 120 Programs the output voltage to 120 Vrms. After the

120 V 60 Hz Turns the output on and applies 120 volts to the

PROT:CLEAR Display accesses the protection menu list.

VOLT:PROT 500 Display shows the overvoltage protection trip scroll to the VOLT:PROT item

Press 1, 6, 0, Enter

VOLT:PROT 160 Programs the OVP to 160 Vpeak, the rms value of

0 V 60 Hz Because the peak OVP voltage entered was less

Meter mode is active and the Dis annunciator should be on.

value is entered, the display returns to Meter mode, which indicates that no voltage is applied to the output.

light bulb. The Dis annunciator should be off and CV should be on.

voltage for your unit. The overvoltage protection voltage is programmed in peak, not rms volts.

which is less than the previously set rms voltage.

than the rms output voltage, the OVP circuit tripped. The output dropped to zero, CV turned off, and Prot turned on.

Press Protect, scroll to the VOLT:PROT item, and press 3, 2, 0,

Enter

Press Protect, and

Enter

VOLT:PROT 320 Programs the OVP to a peak value that is greater

than the rms output voltage value. Note: You cannot clear an OVP trip until you have first removed the cause of the condition.

120 V 60 Hz Executes the PROT:CLEAR command, restoring

the output. Prot turns off and CV turns on.

3 - Turn-On Checkout

Procedure Display Explanation

10. Press Shift, and

Current

11.

Press . 5 Enter

CURR:LEV 5 Indicates the default output current limit setting.

CURR:LEV .5

Sets the current limit to .5 amperes. The CC annunciator is on, indicating that the unit is in current limit mode and the light bulbs are dimmer because the output voltage has dropped in its attempt to limit output current.

12. Press Protect, scroll to the CURR:PROT item, and press È to select ON. Then press Enter.

CURR:PROT ON You have enabled the overcurrent protection

circuit. The circuit then tripped because of the output short. The CC annunciator turns off and the OCP and Prot annuciators come on. The output current is near zero.

13. Press Output On/Off 0.5 V 60 Hz

14. Press Protect, scroll to the CURR:PROT item,

CURR:PROT

OFF

The output is off and the Dis annunciator turns on. You have disabled the overcurrent protection

circuit. The Prot annunciator turns off.

press È to select OFF, then press Enter.

15. Turn the unit off. The next time the unit turns on it will be restored to

the *RST or factory default state

In Case of Trouble

Error Messages

Ac 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 and 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 ac source requires service.

Table 3-1. Power-On Selftest Errors

Error No. Failed Test

Error 0 No error Error 1 Non-volatile RAM RD0 section checksum failed Error 2 Non-volatile RAM CONFIG section checksum failed Error 3 Non-volatile RAM CAL section checksum failed Error 4 Non-volatile RAM WAVEFORM section checksum failed Error 5 Non-volatile RAM STATE section checksum failed Error 6 Non-volatile RAM LIST section checksum failed Error 10 RAM selftest Error 11 to 18 DAC selftest 1 to 8

Turn-On Checkout - 3

Runtime Error Messages

Under unusual operating conditions, the front panel display may show 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 HP-IB measurement is in progress. Appendix C lists other error messages that may appear at runtime.

Line Fuse

If the ac source appears "dead" with a blank display and the fan not running, first check your power source to be certain line voltage is being supplied to the ac source. If the power source is normal, the ac source line fuse may be defective. If the ac source has a defective fuse, replace it only once. If it fails again, investigate the reason for the failure. Proceed as follows:

WARNING: Hazardous voltages can remain active inside the ac source even after it has been

turned off. Fuse replacement should be done only by a qualified electronics technician.

The line fuse is located inside the ac source. To change it, refer to Figure 3-2 and proceed as follows:

1. Turn off the front panel power switch and unplug the line cord from the ac source.

2. Remove the ac cover as follows:

a. Remove the four screws securing the carrying straps and dustcover (use a T25 Torx drive). b. Spread the bottom rear of the cover and pull it back to remove it.

3. Observe the two LEDs on each side of the unit. If either LED is ON, there is still hazardous

voltages present inside the ac source. Wait until the LEDs are out before proceeding (it may take several minutes for the LEDs to go out.)

4. Replace the fuse with one of the same type. Do not use a slow-blow type fuse

5. Replace the cover.

6. Connect the line cord to the ac source.

7. Turn on power and verify operation.

SIDE VIEW (WITH COVER REMOVED)

FUSE

LED

Figure 3-2. AC Source Fuse Location

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 that describe:

 how to program the output voltage and frequency  how to measure the output  how to program the output pulses and lists  how to trigger output changes

Front Panel Description

HEWLETT PACKARD

LINE

300 V rms 50 VA 1

6812A

AC POWER SOURCE / ANALYZER

115.0V 60.0HZ

CV CC CR CP Unr Dis Tran OCP Prot Cal Shift Rmt Addr Err SRQ

VOLTAGE FREQUENCY

Off

2 5 6 7

METER

OUTPUT

SYSTEM

Local

Error Address

Save

Recall

FUNCTION

Harmonic

Current

Index

Voltage

Meter

Output

Phase

Input

Status

Protect

Trigger Trigger

Control

Index

Freq

Shape

Phase Select

List

Pulse

Output

on/off

ENTRY

Calibration

7 8 9

5 6

Enter

321

Clear Entry

Figure 4-1. Front Panel, Overall View

4 - Front Panel Operation

ϕ Display κ Annunciators

λ Voltage/

Frequency

ν Line ο System Keys

π Function Keys

θ Entry Keys

14-character vacuum fluorescent display for showing programmed commands and measured values.

Annunciators light to indicate operating modes and status conditions:

φ1 Phase 1 is being controlled or metered. CV The ac source output is in constant-voltage mode. CC The ac source output is in constant-current mode. Unr The ac source output is in an unregulated state. Dis The ac source output is disabled (off). Tran The ac source output is initialized to output a transient. OCP The overcurrent protection state is enabled. Prot One of the ac source's output protection features is activated. Cal The ac source is in calibration mode. Shift The Shift key is pressed to access an alternate key function. Rmt The selected interface (HP-IB 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. Meter Front panel measurement functions are: ac only, dc only, or ac+dc AC+DC Output The ac source output coupling is: ac only, or ac+dc AC+DC

The rotary pulse generators let you set the output voltage and frequency when the ac source is in local mode. Their response is rate sensitive.

 Turning a control rapidly provides coarse control of the value.  Turning a control slowly provides fine control of the value.

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

 Return to Local mode (front panel control)  Set the ac source HP-IB 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:

 Program output voltage, current limit, frequency, and output waveforms  Turn the ouput on and off  Select metering functions  Send immediate triggers from the front panel  Program transient output functions  Set and clear protection functions  Select output phases  Select the coupling for output and meter functions  Monitor instrument status

Entry keys let you:

 Enter programming values  Increment or decrement programming values  Calibrate the ac source

Front Panel Operation - 4

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

Figure 4-2. 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 ac 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 ac source's interface. Address Menu entries are stored in non-volatile memory.

Display Command Function

ADDRESS <value> Sets the HP-IB Address INTF <char> Selects an interface (HPIB or RS232) BAUDRATE<value> Selects baud rate (300, 600, 1200, 2400, 4800, 9600) PARITY <char> Message parity (NONE, EVEN, ODD, MARK, SPACE) LANG <char> Selects language (SCPI or E9012)

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

ã ä

Use and to scroll through the parameter list.

Press to place the ac source into a previously stored state. You can recall up to 16 (0 through 15) 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 ac source state in non-volatile memory. The parameters saved are listed under *SAV in the ac source Programming Guide. You can save up to 16 states (0 through 15).

4 - Front Panel Operation

On/Off

Select

Function Keys

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

Harmonic

Meter

Output

Input

Status

Protect

Trigger Trigger

Control

FUNCTION

Current Voltage

Phase

Freq

Shape

List

Pulse

Phase

Select

Output

on/off

Index

Figure 4-3. 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

Phase

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

This key only applies to three-phase ac sources

TriggerShift

Sends an immediate trigger to the ac source

Scrolling Keys

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

• ‚

pIndexShift

Shift qIndex

These scroll keys let you move through the choices in a command list. 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:

These shifted scroll keys apply only to the Harmonic and List functions. Press these keys to step through integers 0 through 50 when specifying the desired harmonic number, or 0 through 99 when specifying the desired list point. Hold down these keys to rapidly access any harmonic or list point.

These Entry 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.

Meter Display Keys

Enter

qpÇÈp

IndexqIndex

Metering keys control the metering functions of the ac source.

Front Panel Operation - 4

Meter

Input

Press this key to access the meter menu list.

Display Measurement

<reading>V <reading>Hz rms voltage and frequency (the default) <reading>V <reading>A rms voltage and rms current <reading>A <reading>Hz rms current and frequency (the default) <reading>V <reading>W rms voltage and power <reading> CREST F current crest factor <reading>A PK REP peak current, repetitive <reading>A PK NR peak current, nonrepetitive

<reading> VA apparent power <reading> VAR reactive power <reading> PFACTOR power factor

Press this key to specify the following metering functions.

Display Command Function

INP:COUP <char> Choose meter coupling (AC, DC or ACDC) CURR:RANGE <char> Current measurement range (HIGH or LOW)

HIGH = for measuring rms currents > 5.7 A LOW = for measuring rms currents < 5.7 A

WINDOW <char> Select harmonic measurement window meter

(KBESSEL, RECT)

Shift Harmoni

Press this key to access the harmonic menu list

Display Measurement

<reading>A I:MAG: <index> current harmonic magnitude <reading>° I:PHASE: <index> <reading>V V:MAG: <index> voltage harmonic magnitude <reading>° V:PHASE: <index> <reading> N:MAG: <index> neutral current harmonic magnitude <reading>° N:PHASE: <index> <reading>° CURR:THD <reading>° VOLT:THD

Notes:

Displays the highest peak current since it was last cleared.The value is cleared when you scroll into this selection or press or reading = the returned measurement index = a numeric value that represents the harmonic number from 0 to 50 char = a character string parameter and scroll through the command list. and scroll through the parameter list. and specify the desired harmonic.

current harmonic phase

voltage harmonic phase

neutral current harmonic phase current total % harmonic distortion voltage total % harmonic distortion

Clear Entry

4 - Front Panel Operation

Current

qpÇ

Output Control Keys

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

Voltage

Shift

Press this key to access the voltage menu list.

Display Command Function

VOLT <value> Set immediate rms output voltage VOLT:T<value> Set triggered rms output voltage VOLT:M <char> Select the voltage mode (FIXED, STEP, PULSE or LIST) OFFSET <value> Set immediate dc offset voltage OFFSET:T<value> Set triggered dc offset voltage OFFSET:M <char> Select the dc offset voltage mode (FIXED, STEP, PULSE

or LIST) SLEW <value> Set immediate voltage slew rate in volts/second SLEW:T<value> Set triggered voltage slew rate in volts/second SLEW:M <char> Select the voltage slew mode (FIXED, STEP, PULSE or

LIST) OFF:SLW <value> Set immediate dc offset voltage slew in volts/second OFF:SLW:T<value> Set triggered dc offset voltage slew in volts/second OFF:SLW:M <char> Select the dc offset voltage slew mode (FIXED, STEP,

PULSE or LIST) ALC <char> Select the voltage sense source (INT or EXT) ALC:DET <char> Select the voltage sense detector (RTIME or RMS)

Press this key to access the current menu list.

Freq

Display Command Function

CURR:LEV <value> Set immediate rms output current limit CURR:PEAK <value> Set immediate peak output current limit CURR:PEAK:T <value> Set triggered peak output current limit CURR:PEAK:M <value> Select the peak output current limit mode (FIXED, STEP,

PULSE or LIST)

Press this key to access the frequency menu list.

Display Command Function

FREQ <value> Set immediate output frequency FREQ:T<value> Set triggered output frequency FREQ:M <char> Select the frequency mode (FIXED, STEP, PULSE or

LIST) SLEW <value> Set immediate frequency slew rate in volts/second SLEW:T<value> Set triggered frequency slew rate in volts/second SLEW:M <char> Select the frequency slew mode (FIXED, STEP, PULSE

or LIST)

Notes:

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

Front Panel Operation - 4

qpÇ

Shift

Shape

Pulse

Phase

Press this key to access the phase menu list.

Display Command Function

PHASE <value> Set immediate output phase PHASE:T <value> Set triggered output phase PHASE:M <char> Select the phase mode (FIXED, STEP, PULSE or LIST)

Press this key to access the shape menu list.

Display Command Function

SHAPE <char> Select the immediate output wave shape (SINE,

SQUARE, or CSINE) CSIN = clipped sine wave SHAPE:T <char> Select the triggered output wave shape (SINE, SQUARE,

or CSINE) CSIN = clipped sine wave SHAPE:M <char> Select the shape mode (FIXED, STEP, PULSE or LIST) CLIP <value> Set the clipping level of the CSIN wave shape. This

specifies the point where clipping starts as a percentage of

the peak amplitude or percentage of THD.

Press this key to access the pulse menu list.

Display Command Function

WIDTH <value> Set the pulse width COUNT <value> Set the number of output pulses DCYCLE <value> Set the pulse duty cycle as a percentage of the pulse

period PER <value> Set the pulse period HOLD <char> Set the parameter that will be held constant as the other

parameters change (WIDTH or DCYCLE)

Shift

Output

Press this key to access the output menu list.

Display Command Function

OUTP:COUP <char> Select output coupling (AC or DC) *RST Execute *RST command to place the ac source in the

factory-default state TTLT:SOUR <char> Select Trigger Out source coupling (BOT, EOT or LIST)

BOT = beginning of trensient

EOT = end of transient

LIST = TTLT trigger (see Programming Guide) TTLT:STATE <value> Set Trigger Out state (ON or OFF) IMP:STATE <value> Set output impedance programming (ON or OFF) IMP:REAL <value> Set real part of output impedance IMP:REAC <value> Set reactive part of output impedance PON:STATE <char> Select power-on state command (RST or RCL0) RI <char> Sets remote inhibit mode (LATCHING, LIVE, or OFF) DFI <char> Sets discrete fault indicator state (ON or OFF) DFI:SOUR <char> Select the DFI source (QUES, OPER, ESB, RQS, or OFF)

(see chapter 4 of Programming Guide)

Notes:

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

4 - Front Panel Operation

qpÇ

Protection and Status Control Keys

The Protect and Status keys control the protection functions and status registers of the ac source. Refer to chapter 4 of the Programming guide for more information on the status registers.

Protect

Press this key to access the protection menu list.

Display Command Function

PROT:CLEAR Clear the status registers of all activated protection signals.

The fault causing a signal must be corrected or removed

before the register can be cleared. CURR:PROT <char> Set overcurrent protection function (ON or OFF). VOLT:PROT <value> Set the overvoltage protection level

DELAY <value> Set the time delay for activating a protection fault after

programming the output

StatusShift

Press this key to access the status menu list. Note that in the following list, commands ending in ? clear the registers when they are read. For this reason the registers are read only after you press , not when you scroll to the command

Enter

Display Command Function

*CLS Executes the clear status (*CLS) command STATUS:PRESET Execute the STATus:PRESet command *ESR? <value> Return Event Status register value *STB <value> Return Status Byte register value OPER:EVEN? <value> Return STAT:OPER:EVENT? value OPER:COND <value> Return STAT:OPER:COND? value QUES:EVEN? <value> Return STAT:QUES:EVENT? value QUES:COND <value> Return STAT:QUES:COND? value

Notes:

Programmed in peak volts. (Other voltage parameters are programmed in rms volts) value = a numeric value char = a character string parameter and scroll through the command list. and scroll through the parameter list.

Front Panel Operation - 4

Control

qpÇ

Clear Entry

IndexqIndex

Trigger and List Control Keys

The Trigger Control key controls output transient triggers. The List key controls the generation of output lists. A list can contain up to 100 points, each of which can specify an output change (or transient). Refer to chapter 4 of the Programming Guide for more information about programming triggers and lists.

Trigger

Press this key to access the trigger control menu list.

Display Command Function

INIT:IMMED Initiate the transient trigger sequence immediately. INIT:CONT <char> Set continuous trigger initiation (ON or OFF). TRIG:SOUR <char> Select transient trigger source (BUS, EXT, TTLT or

IMM). DELAY <value> Set trigger delay in seconds. ABORT Abort all trigger sequences. SYNC:SOUR <char> Select trigger sync source (PHASE or IMM). SYNC:PHASE <value> Set synchronous phase reference angle in degrees.

ListShift

Press this key to access the list commands

Display Command Function

COUNT <value> Specifies the number of times a list repeats. DWEL:<index> <value> List of output dwell times. FREQ:<index> <value> List of output frequencies. FSLW:<index> <value> List of output frequency slew rates IPK:<index> <value> List of output peak current limits. OFFS:<index> <value> List of dc output voltages. OSLW:<index> <value> Dc offset voltage slew rate list PHASE:<index> <value> List of output voltage phase angles. SHAP:<index> <char> List of output waveform shapes.

(SINE, SQUARE or CSIN) CSIN = clipped sine wave STEP<char> Response of list to triggers (ONCE or AUTO). TTLT:<index> <value> List of Trigger Out pulses (0=no pulse; 1=pulse). VOLT:<index> <value> List of ac output voltages. VSLW:<index> <value> List of output voltage slew rates.

Notes:

User-defined waveshapes will also appear in this list when created. value = a numeric value char = a character string parameter index = a numeric value that represents a list point from 0 to 99 and scroll through the command list. and scroll through the parameter list. and scroll through the desired list points. EOL is displayed when the end of the list is reached. When a value is edited, pressing automatically

Enter

advances to the next list point. Pressing truncates or clears the list at the presently displayed list point.

4 - Front Panel Operation

Entry Keys

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

−

Calibration

7 8 9

ENTRY

5 6

321

Clear Entry

Enter

Figure 4-4. Entry Keys

äã

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.

through are used for entering numeric values. is the decimal

.90

point. For example, to enter 33.6 press: 3 3 . 6 Enter.

Enter

Shift

Shift Clear Entry

Shift Calibration

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 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 ac source. Before pressing

Enter

you can change or abort anything previously entered into the display. After Enter is pressed, the ac source returns to Meter mode in most cases. In Harmonic or List mode, the ac sourse displays the next point in the list.

EShift

This key specifies an exponential power of 10. For example, the the value for 100µs can be entered as either . 0 0 0 1 , or as 1 E − 4

−

This key − is the minus sign. 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. When editing a list, pressing truncates or

Clear Entry

clears the list at the presently displayed list point. This key accesses the calibration menu (Refer to Appendix B to calibrate your ac

source).

Front Panel Operation - 4

Examples of Front Panel Programming

You will find these examples on the following pages: 1 Setting the output voltage amplitude 2 Setting the output frequency 3 Setting the dc offset 4 Setting a protection feature 5 Clearing a protection feature 6 Generating step, pulse, and list transients 7 Programming trigger delays and phase synchronization 8 Programming slew rates 9 Measuring peak inrush current 10 Setting the HP-IB address or RS-232 parameters 11 Saving and recalling operating states

The examples in the ac source Programming Guide are similar to the ones in this section, except that they use SCPI commands.

1 - Setting the Output Voltage Amplitude

NOTE: The maximum voltage that the ac source can output is limited by the peak value of the

waveform, which is 425 V

. Since the output is programmed in units of rms volts, the

peak

maximum value that can be programmed is dependent on the peak-to-rms ratio of the selected waveform. For a sinewave, the maximum ac voltage that can be programmed is 300 V

. For other waveforms the maximum may be different.

rms

When you turn on the ac source, the default output shape is a 60 Hz sinewave at 0 Vrms. There is no output from the ac source because the default output state is OFF, as indicated by the Dis annunciator. Set

the output to 120 V rms as follows:

Action Display

You can set the voltage in any of three ways:

On the Function keypad, press Voltage. On the Entry keypad, press 1 2 0 Enter. This is the easiest way to enter an accurate value.

2. On the Function keypad, press Voltage. On the Entry keypad, press Ç or È to

increment or decrement the existing value. This technique is useful when you are making minor changes to an existing value.

Rotate the front panel Voltage knob to obtain 120 V. This method is best when you want to enter a value without using the voltage menu.

Note: You will not see the new voltage on the front panel meter unless the output is enabled.

VOLT 120

VOLT 127

120 V 60 Hz

To enable the output:

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

120 V 60 Hz

4 - Front Panel Operation

2 - Setting the Output Frequency

When you turn on the ac source, the default output frequency is a 60 Hz. Assuming the voltage output from example 1 is in effect (120 Vrms sinewave), change the frequency to 50 Hz as follows:

Action Display

You can set the frequency in the same way that you set the voltage:

1. On the Function keypad, press Freq. On the Entry keypad, press 5 0 Enter. FREQ 50

2. On the Function keypad, press Freq. On the Entry keypad, press Ç or È to

increment or decrement the existing value.

Rotate the front panel Frequency knob to obtain 50 Hz.

To verify the output, use the meter menu:

4. The Meter menu is presently displaying the measured voltage and frequency of the

selected output phase. Press • and ‚ to scroll through all of the measurement functions in the Meter Menu.

FREQ 50

120 V 50 Hz

3 - Setting the DC Offset

NOTE: Because the maximum voltage that the ac source can output is limited to 425 V

cannot program a dc offset that will cause a previously programmed ac voltage to exceed the 425 V

limit (ac

peak

+ offset ≤ 425 V).

peak

The dc output capability of the ac source lets you independently control the dc and ac components of the output voltage. Program a dc offset of 100 V as follows:

Action Display

1. On the Function keypad, press Voltage and then press ‚ until you access the

OFFSET command.

On the Entry keypad, press 1 0 0 Enter. OFFSET 100

OFFSET 0

peak

, you

3. On the Function keypad, press Shift Output to access the output coupling

command. Note: When the output coupling is set to ac, the ac source regulates the dc output

voltage to 0, regardless of any programmed voltage offset.

4. Press È and Enter to change the output coupling to DC. OUTP:COUP DC

5. The ac source output now combines the previously programmed ac rms voltage and

the dc offset voltage. This is indicated by the OUTPUT AC+DC annunciator. The front panel meter is measuring a 120 Vrms sinewave offset by 100 Vdc. This is indicated by the METER AC+DC annunciator.

To measure just the ac or just the dc portion of the output:

6. On the Function keypad, press Input to access the metering functions.

Press È until you access the DC parameter and press Enter. This changes the

7. metering function to dc, which measures just the dc portion of the output in volts. The meter annunciator indicates METER AC

Press Input again. Press È until you access AC and press Enter. This changes the

8. metering function to ac, which measures just the ac portion of the output in rms volts. The meter annunciator indicates METER DC

OUTP:COUP AC

156 V 50 Hz

INP:COUP ACDC

INP:COUP DC

100 V 50 Hz

INP:COUP AC

120 V 50 Hz

Front Panel Operation - 4

4 - Setting a Protection Feature

You can set the ac source to disable its output if it detects an overvoltage or overcurrent fault condition. Other automatic fault conditions (such as overtemperature) also will disable the output. Set the

overcurrent protection feature as follows:

Action Display

On the Function keypad, press Protect. PROT:CLEAR

2. Press È to obtain the overcurrent command. CURR:PROT OFF

3. On the Entry keypad, press once to scroll to the ON parameter and press Enter. The OCP annunciator will light, indicating that the overcurrent protection circuit is on. CURR:PROT ON

If you wish to set a time delay between the detection of the fault and the disabling of the output, scroll to the delay command on the protection menu. The default delay is 100 milliseconds.

Enter the delay from the Entry keypad, such as . 2 5 0 Enter.

When you want to restore normal operation after the cause of the overcurrent condition has been removed, scroll to the protection clear command and press Enter. The OCP annunciator then will go off.

CURR:PROT ON

DELAY .1

DELAY .250

PROT:CLEAR

5 - Clearing Protection Conditions

When the output Prot annunciator is on, the output of the ac source has turned off due to one or more of the following conditions:

Annunciator Description Bit Number Bit Weight

OV overvoltage protection has tripped 0 1 OCP rms overcurrent protection has tripped 1 2 SOA safe operating area has tripped 2 4

OT overtemperature protection has tripped 4 16

RI an external remote inhibit signal has occurred 9 512

Rail rail protection has tripped 11 2048

Action Display

1. You must first identify the cause of the protection shutdown, and then eliminate its cause before you can continue operating the unit.

2. To identify the problem, press Shift Status. *CLS

3. Press ‚ to obtain the Questionable Event command. QUES:EVEN?

4. Press Enter to find out which bits have been set in the Event Register. Note: The value returned is the sum of all of the binary weights of the bits that have

been set. For example, a value of 20 indicates that bit 2 (bit weight=4) and bit 4 (bit weight=16) have been set. Refer to the previous table for the bits and bit weights that are assigned to the protection conditions. Refer to the following table for information on eliminating the couse of the protection condition. Refer to chapter 4 in the ac source Programming Guide for a complete discussion of the status system.

QUES:EVEN 20

4 - Front Panel Operation

Condition Action

OV Condition

OCP Condition

SOA Condition

OT Condition

Usually overvoltage conditions are caused by an external source forcing voltage into the output of the ac source. Remove this external source to eliminate the overvoltage. You can also program the overvoltage level to a higher value, or turn the overvoltage protection off.

In other cases the output voltage may have exceeded the user-programmed overvoltage level. In this case the unit may have inadvertently been programmed to a voltage that exceeded the programmed overvoltage level. The VOLTage:PROTection command sets the overvoltage protection level.

Note: The overvoltage protection level is programmed in peak, not rms volts. If the CURRent:PROTection:STATe command has been programmed to to disable the output

when rms current limit is activated, the unit will shut down. The rms current limit threshold is set by the CURRent command. In this case you must check to see why the load is drawing more current than the limit that has been programmed by the CURRent command.

Protection circuits in the ac source let the load draw peak currents for short periods of time that exceed the continuous capability of the unit. This allows loads that require large inrush currents to turn on. The ac source will shut down if a combination of peak current duration and internal component temperature exceeds a predetermined limit.

When this occurs, it means that the load has been drawing peak output currents that are beyond the capability of the ac source to supply for extended periods. Slower output slew rates and reduced peak current limit settings can be used to control the conditions that cause SOA shutdowns.

When the internal operating temperatures of the ac source exceed predetermined thresholds, the output turns off. If this happens, you must let the unit cool down before continuing operation.

RI Condition

Rail Condition

If the Remote Inhibit input has been programmed to to disable the output when it receives an external signal, the unit will shut down. The Remote Inhibit input is set by the OUTPut:RI:MODE command. In this case you must check to what external event produced a signal on the RI input.

The internal high voltage rail that provides power for the ac source's output is continuously monitored for proper voltage level. If this voltage is not maintained within predetermined levels, the output will shut down. This can happen if an extenal source forces too much power into the ac source or if too much power is drawn from the ac source.

Remove the external source to eliminate the rail condition. Slower output slew rates and reduced peak current limit settings can also be used to control the conditions that cause rail shutdowns.

6 - Using Transient Voltage Modes

The ac source voltage can be programmed in the following transient operating modes: STEP causes the output to permanently change to its triggered value. PULSE causes the output to change to its triggered value for a specific time, as determined by the

Pulse menu parameters.

LIST causes the output to sequence through a number of values, as determined by points entered

in the List menu.

FIXED disables transient operation for the selected function.

Front Panel Operation - 4

Step Transient

The Voltage Menu lets you specify an alternate or triggered voltage level that the ac source will apply to the output when it receives a trigger. Because the default transient voltage level is zero volts, you must first enter a triggered voltage before you can trigger the ac source to change the output amplitude. Refer to chapter 4 of the Programming Guide for more information about programming triggers.

In the following example, the voltage output is set to 120 Vrms and then stepped down to 102 Vrms.

Action Display

On the Function keypad, press Output On/Off to enable the output. The Dis annunciator will go off.

2. Press Voltage to access the Voltage Menu. On the Entry keypad, press 1 2 0

Enter.

3. Access the Voltage Menu again and press ‚ to access the triggered voltage command.

4. On the Entry kepad, press 1 0 2 Enter. VOLT:T 102

5. Access the Voltage Menu again and press ‚ to access the voltage mode command. It should be in the default FIXED mode. An ac source function in the FIXED mode does not respond to triggers. On the Entry keypad, press Ç or È to scroll through the mode parameters. When you have STEP, press Enter.

6. Press Trigger Control and Enter. This initiates (or enables) one immediate trigger action.

7. Press Shift Trigger. This sends the ac source an immediate trigger signal to change the output voltage. The triggered voltage value now becomes the VOLT value.

0 V 60 Hz

VOLT 120

VOLT:T 0

VOLT:M STEP

INIT:IMMED

102 V 60 HZ

Pulse Transient

In the following example, the output is four 83.3-millisecond, 120 Vrms pulses at 60 Hz. The figure shows the trigger, pulse count, pulse period, and duty cycle.

NOTE: From the Output Menu, execute the *RST command to reset the ac source. This is

necessary because any previously programmed functions remain in effect until cleared.

Trigger

count = 4

120Vrms 102Vrms

83.3ms 250ms

Figure 4-5. Pulse Transients

4 - Front Panel Operation

Action Display

1. Press Voltage to access the Voltage Menu. On the Entry keypad, press 1 0 2 Enter. VOLT 102

2. Press ‚ to access the triggered voltage command. On the Entry keypad, press 1 2 0

VOLT 120

Enter.

3. Access the Voltage Menu again and press ‚ to access the voltage mode command.

VOLT:M PULSE

On the Entry keypad, press Ç or È to scroll through the mode parameters to obtain PULSE and press Enter.

4. Press Pulse to access the Pulse Menu. From the Entry keypad, press

WIDTH .0833

. 0 8 3 3 Enter to enter a pulse width of 83.3 milliseconds.

5. Access the Pulse Menu and press ‚ to access the duty cycle command. From the

DCYCLE 33

Entry keypad, press 3 3 Enter to change the duty cycle to 33%.

6. Access the Pulse Menu and press ‚ to access the pulse count. On the Entry keypad,

COUNT 4

press 4 and Enter.

7. Press Trigger Control and Enter to initiate the transient trigger sequence. INIT:IMMED

8. Press Shift Trigger. This sends the ac source an immediate trigger signal to

102 V 60 HZ

generate the four output pulses. Note: The ac source output returns to 102 V at the completion of the output pulses.

List Transient

Lists are the most flexible means of generating multiple or synchronized transient outputs. The following figure shows a voltage output generated from a list. The output shown represents three different ac voltage pulses (160 volts for 33 milliseconds, 120 volts for 83 milliseconds, and 80 volts for 150 milliseconds) separated by 67-millisecond, 0-volt intervals.

The list specifies the pulses as three voltage points (point 0, 2, and 4), each with its corresponding dwell point. The intervals are three zero-voltage points (point 1, 3, and 5) of equal intervals. The count parameter causes the list to execute twice when started by a single trigger.

NOTE: From the Output Menu, execute the *RST command to reset the ac source. This is

necessary because any previously programmed functions remain in effect until cleared.

Trigger

160 Vrms

0 1

3 4 5

List Count = 1 List Count = 2

Figure 4-6. List Transients

Front Panel Operation - 4

Action Display

1. Press Voltage to access the Voltage Menu. Then press ‚ to access the voltage mode

command.

VOLT:M

FIXED

2. On the Entry keypad, press Ç or È to scroll through the mode parameters to obtain

LIST and press Enter.

3. Access the List Menu by pressing Shift List. The first menu command is the count. From the Entry keypad, change the list count from the default (1) to 2. Press Enter.

4. Access the List menu again and press ‚ until you access the dwell time. This specifies the "on" time for each voltage point, which is effectively the output pulse width. The first dwell point (0) appears in the display. On the Entry keypad, press . 0 3 3 and Enter.

5. Pressing the Enter key automatically advances to the step in the list. Enter the following values for dwell list points 1 through 5: .067, .083, .067, .150, .067. Press Enter to enter each value. When you finish, you will be at point 6, which is the end of the list.

Note: Press Shift •Index or Shift ‚Index to access and edit any list point.

6. Press ‚ until you access the voltage list. This specifies the amplitude of each output point during its corresponding dwell period. The first voltage list point (0) appears in the display. On the Entry keypad, press 1 6 0 and Enter.

7. Pressing the Enter key automatically advances to the step in the list. Enter the following values for voltage list points 1 through 5: 0, 120, 0, 80, 0. Press Enter to enter each value. When you finish, you will be at point 6, which is the end of the list.

Note: Press Shift •Index or Shift ‚Index to access and edit any list point.

VOLT:M LIST

COUNT 2

DWEL 0 .033

DWEL 1 .067 DWEL 2 .083 DWEL 3 .067 DWEL 4 .150 DWEL 5 .067

DWEL 6 EOL

VOLT 0 160

VOLT 1 0

VOLT 2 120

VOLT 3 0

VOLT 4 80 VOLT 5 0 VOLT 6 EOL

8. Press ‚ until you access the step command. Check that it is at the default mode

(AUTO). This lets a single trigger run your list for the specified count.

Press Output On/Off to enable the output. The Dis annunciator will go off.

10. Press Trigger Control and Enter to initiate the transient trigger sequence. INIT:IMMED

11. Press Shift Trigger. This sends the ac source an immediate trigger to generate the four

output pulses. The output returns to the immediate value at the end of the list. Note: To clear a list, press Clear Entry. This truncates or clears the list at the

presently displayed list point. Each list must be accessed and cleared separately.

STEP AUTO

0 V 60 Hz

7 - Trigger Delays and Phase Synchronization

The ac source trigger system also lets you program trigger delays as well as synchronize output changes to a specific phase angle of the output waveform.

In example ϕ, the output transient is triggered immediately at the receipt of the trigger signal. In example ‚, a delay time of approximately 16.7 milliseconds elapses between the occurence of the trigger and the start of the output transient. In example ƒ, the trigger source is programmed for phase synchronization, which means that the transient occurs at the first occurrence of the specified phase angle after the trigger signal is received.

Note that phase synchronization is referenced to an internal phase signal. The output of the unit is normally offset by 0° with respect to this internal reference. Because synchronized transient events always occur

4 - Front Panel Operation

with respect to the internal reference, the output will normally be in phase with the value programmed for phase synchronization. (The Phase command can be used to change the offset of the output with respect to the internal phase reference.)

Trigger

VOLT T level

VOLT level

VOLT T level

VOLT level

VOLT T level

VOLT level

0.000

0.0167

Figure 4-7. Trigger Delays and Phase Synchronization

Example Display

This example uses the default trigger parameters. First, access the Voltage

menu and program the immediate and triggered voltage levels, followed by the voltage transient mode.

Then press Trigger Control and Enter, followed by Shift Trigger. In this example, you will set a trigger delay. First, access the Voltage menu

‚

and program the immediate and triggered voltage levels, followed by the voltage transient mode.

VOLT 120

VOLT:T 150

VOLT:M STEP

INIT:IMMED

VOLT 120

VOLT:T 150

VOLT:M STEP

Press Trigger Control. Then press ‚ until you access the delay parameter. On the Entry keypad, press . 0 1 6 7 Enter.

Then press Trigger Control and Enter, followed by Shift Trigger. This example uses the phase sync mode with no delay, but synchronized at

90. First, access the Voltage menu and program the immediate and triggered voltage levels, followed by the voltage transient mode.

Press Trigger Control. Press ‚ until you access the delay parameter. If necessary, set it to 0. Press ‚ until you access the sync source command. On the Entry keypad, press È to obtain PHASE. Press Enter.

Access the Trigger Control menu again and press ‚ to access the sync phase reference parameter. On the Entry keypad, program a 90° phase reference by entering 9 0 Enter.

Then press Trigger Control and Enter, followed by Shift Trigger.

DELAY 0

DELAY .0167

INIT:IMMED

VOLT 120

VOLT:T 150

VOLT:M STEP

DELAY 0

SYNC:SOUR PHASE

SYNC:PHAS 90

INIT:IMMED

Front Panel Operation - 4

New VOLT level

TRIGGER

VOLT:T level

SLEW [0]

SLEW [1]

APPLIED

LIST

COMPLETE

width

SLEW rate

SLEW:T rate

VOLT:T level

SLEW:T rate

SLEW rate

SLEW:T

rate

SLEW rate

SLEW [3]

SLEW [2]

VOLT level

8 - Using Slew Rates to Generate Waveforms

As shown in the previous examples there are a number of ways that you can generate custom waveforms. Programmable slew rates provide additional flexibility when customizing waveforms. The following figure illustrates how programmable slew rates are applied in the transient operating modes.

In example •, an immediate slew rate of 50 volts/second is used whenever a new output voltage is programmed. In example ‚, a triggered slew rate of 50 volts/second steps the voltage level to its new value. 50 volts/second becomes the new immediate slew rate in step mode. In example ƒ, a triggered slew rate of 50 volts/second is used at the start of the pulse. The immediate slew rate of infinity applies at the trailing edge of the pulse. In example „, the slew rates are set by the values in the voltage slew list.

1 SLEW:MODE FIXED

2 SLEW:MODE STEP

3 SLEW:MODE PULSE

4 SLEW:MODE LIST

Figure 4-8. Programming Slew Rates

4 - Front Panel Operation

Example Display

This example uses the immediate slew rate. First, access the Voltage menu

and press ‚ until you access the mode command. On the Entry keypad, press È to obtain FIXED. Press Enter.

Access the voltage menu and press ‚ until you access the slew command. On the Entry keypad, press 5 0 Enter to program a slew rate of 50 volts/second.

Whenever a new immediate voltage value is entered, the output will slew to the new level at 50 volts/second.

Step mode uses the triggered slew rate. First, access the Voltage menu,

‚

program the immediate and triggered voltage levels, and set the slew mode to STEP.

Access the Voltage menu and press ‚ to access the immediate slew command. On the Entry keypad, enter a value that equals infinity.

Access the Voltage menu and press ‚ until you access the triggered slew command. On the Entry keypad, enter a value such as 5 0 Enter, which sets the triggered slew rate to 50 volts/second.

Then press Trigger Control and Enter, followed by Shift Trigger. After the trigger has been sent, in step mode, the triggered value becomes the

new immediate value.

Pulse mode uses the triggered slew rate at the leading edge of the pulse, and

the immediate slew rate at the trailing edge of the pulse. First, access the Voltage menu, program the immediate and triggered voltage levels, and set the slew mode to PULSE.

VOLT:M FIXED

SLEW 50

VOLT 120

VOLT:T 150

SLEW:M STEP

SLEW: 9.9+E37

SLEW:T 50

INIT:IMMED

VOLT 120

VOLT:T 150

SLEW:M PULSE

Access the Pulse menu and program the pulse count, duty cycle, and pulse period.

Access the Voltage menu and press ‚ to access the immediate slew command. On the Entry keypad, enter a value that equals infinity.

Access the Voltage menu and press ‚ until you access the triggered slew command. On the Entry keypad, enter a value such as 5 0 Enter, which sets the triggered slew rate to 50 volts/second.

Then press Trigger Control and Enter, followed by Shift Trigger. When the voltage slew mode is set to LIST, the slew rates are set by the

„

values in the voltage slew list. Refer to the List Transient example for more information on how to program lists. You must program the voltage values and dwell times as explaied in that example. You must also program a slew rate for each point in the list (even if it is 9.9+E37).

COUNT 2

DCYCLE 33

PER .0166

SLEW: 9.9+E37

SLEW:T 50

INIT:IMMED

NOTE: When specifying a dwell time, you must take the slew time into consideration. If the dwell

time at any given list point is less than the slew time at the same point, the voltage will never reach its programmed level before the next list point becomes active.

Front Panel Operation - 4

9 - Measuring Peak Inrush Current

Peak inrush current is a non-repetitive measurement in the sense that peak inrush current occurs only when the unit under test is first turned on. In order to repeat the measurement, you must turn the unit off and wait for any input filter capacitors to discharge completely.

This example shows you how you can measure the peak inrush current using the front panel meter. The voltage is set to 120 V rms and the output is triggered at an output phase of 75°, which optimizes the conditions under which inrush current is applied to the unit under test.

Action Display

1. Set the immediate voltage to 0. Press Voltage, then press 0 and Enter. VOLT 0

2. Set the triggered voltage to 120 V rms. In the Voltage menu, press ‚ to

access the triggered voltage command. Then press 1 2 0 Enter.

3. Set the voltage mode to step. In the Voltage menu, press ‚ to access the mode command. Press È to scroll to STEP and press Enter.

4. Make sure the triggered voltage slew rate is set to the fastest possible speed. In the Voltage menu, access the triggered slew command. If necessary, reset the slew rate to a faster speed.

5. Make sure the peak current and rms current limits are set to high values. In the Current menu, access the rms current limit and then the peak current limit commands. If necessary, reset the rms current and the peak current limits to higher values. (HP 6811B units have an rms current limit of 3.25 A. HP 6813B units have an rms current limit of 13 A and a peak current limit of 80 A)

6. Synchronize the trigger source with a reference phase angle. In the Trigger Control menu, press ‚ to access the sync source command. Press È to obtain PHASE and press Enter.

Set the reference phase angle to 75°. In the Trigger Control menu, press ‚ to access the sync phase command. Then press 7 5 Enter.

8. Initiate (or enable) the unit for one immediate trigger from the front panel. Press Trigger Control and Enter.

9. Set the meter function to measure nonrepetitive peak inrush current. In the Meter menu, press ‚ to access the peak inrush current display.

VOLT:T 120

VOLT:M STEP

SLEW:T 9.9000+E37

CURR:LEV 6.5

CURR:PEAK 40

SYNC:SOUR PHASE

SYNC:PHAS 75

INIT:IMMED

0 A PK NR

10. Enable the output by pressing Output On/Off. 0 V 60 HZ

11. Send the trigger to step the output from 0 V to 120 V. Press Shift Trigger. The inrush current is displayed on the Meter.

48 A PK NR

NOTE: With fast and/or large voltage transitions, the CC annunciator may turn on due to current

in the output capacitor. This is normal and will limit the rate of change of output voltage. To prevent the CC operating mode from limiting the rate of change of output voltage, program the peak current limit to a higher value.

4 - Front Panel Operation

10 - Setting the HP-IB Address and RS-232 Parameters

Your ac source is shipped with the HP-IB 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.

Action Display

To set the HP-IB address, proceed as follows:

1. On the System keypad, press Address. ADDRESS 5

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

To configure the RS-232 interface, proceed as follows:

1. On the System keypad, press Address. ADDRESS 5

2. Scroll through the Address menu by pressing ‚ . 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.

3. The Ç and È keys let you select the command parameters.

INTF RS232

BAUDRATE 600

PARITY EVEN

11 - Saving and Recalling Operating States

You can save up to 16 states (from location 0 to location 15) in non-volatile memory and recall them from the front panel. All programmable settings are saved.

Action Display

To save an operating state in location 1, proceed as follows:

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

2. Save this state to location 1. Press Shift Save 1 Enter. *SAV 1

To recall a saved state in location 1, proceed as follows:

1. Recall the state saved in location 1 by pressing Recall 1 Enter *RCL 1

To select the power-on state of the ac source, proceed as follows:

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

2. Use the Ç and È 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

To clear the non-volatile memory of the ac source, proceed as follows:

1. On the Function keypad, press Shift Output and scroll to the *RST com-

mand. Then press Enter. This returns the unit to the factory-default settings.

2. Save these settings to location 1. Press Shift Save 1 Enter. *SAV 1

3. Repeat step #2 for memory locations 2 through 16.. *SAV 2

*RST

*SAV 3

*SAV 4

. .

...*SAV 16

Specifications

Table A-1 lists the specifications of the ac source. Performance specifications are warranted over the

ambient temperature range of 0 to 40 oC. Unless otherwise noted, specifications are for a sinewave with a resistive load at an output frequency range of 45 Hz to 1 kHz, in ac-coupled mode after a 30-minute warmup. Refer to table A-3 for ac source operation with output frequencies from dc to 45 Hz.

Table A-1. Performance Specifications

Parameter HP 6811B HP 6812B HP 6813B Phases: Maximum Output Ratings Power (VA):

dc Power (Watts):

rms Voltage:

dc Voltage:

rms Current (in real-time mode):

dc Current:

Repetitive peak Current2:

Non-repetitive peak Current

(inrush):

Crest Factor2 (current): Output Frequency Range3: Constant Voltage Ripple rms relative to full scale: and Noise (20 kHz−10 MHz): Regulation: Load (rms detection mode):

Maximum Total Harmonic Distortion:

Load Power Factor Capability: Maximum Fixed dc Offset Voltage (ac coupled): Programming Accuracy

(rms detection mode @ 25oC ±5oC), ±(% of output+offset)

Measurement Accuracy

(@25oC ±5oC), ± (% of output + offset)

rms Voltage (45−100 Hz):

(>100−500 Hz):

(>500 Hz−1 kHz):

rms Voltage (45−100 Hz):

(>100−500 Hz):

(>500 Hz−1 kHz):

rms:

Line:

Frequency:

dc Voltage:

Frequency:

dc Voltage:

1 1 1

375 VA 750 VA 1750 VA

285 W 575 W 1350 W

300 V 300 V 300 V

± 425 V ± 425 V ± 425 V

3.25 A 6.5 A 13 A

2.5 A 5 A 10 A 40 A 40 A 80 A

40 A 40 A 80 A

12 6 6

dc; 45 Hz−1 kHz

−60 dB

300 mV

0.5% of full scale

0.1% of full scale

0.25% at 50 Hz/60 Hz

1% worst-case 45 Hz−1 kHz

0−1

100 mV

0.15% + 0.3 V

0.5% + 0.3 V 1% + 0.3 V)

0.01% + 10 µHz

0.1% + 0.5 V 0.1% + 0.5 V 0.5% + 0.3 V

0.03% + 100 mV

0.1% + 100 mV

0.2% + 100 mV

0.01% + 0.01 Hz

0.03% + 150 mV

A - Specifications

Table A-1. Performance Specifications (continued)

Parameter HP 6811B/6812B/6813B

Measurement Accuracy

(continued)

Harmonic Measurement Accuracy

(50/60 Hz, @25oC ±5oC), ± (% of output + offset)

Current Magnitude (High Range)

Specifications subject to change without notice.

These specifications are subject to the restrictions of Table 1-3.

Product may be operated between dc and 45 Hz subject to operating conditions described in Table A-3.

rms Current High Range

(45−100 Hz):

(>100−500 Hz):

(>500 Hz−1 kHz):

rms Current Low Range

(45−100 Hz):

(>100−500 Hz):

(>500 Hz−1 kHz):

repetitive pk current High

Range

(45 Hz−1 kHz):

repetitive pk current Low Range

(45 Hz−1 kHz):

Power (VA) Low Range

(45−100 Hz):

(>100−500 Hz):

(>500 Hz-1 kHz):

Power (VA) High Range

(45−100 Hz):

(>100−500 Hz):

(>500 Hz−1 kHz):

Power (Watts) Low Range

(45−100 Hz):

(>100−500 Hz):

(>500 Hz−1 kHz):

Power (Watts) High Range

(45−100 Hz):

(>100−500 Hz):

(>500 Hz−1 kHz):

Power Factor:

Voltage Magnitude:

Current Magnitude (Low Range)

Fundamental:

Harmonics 2−49:

Fundamental:

Harmonics 2−49:

0.05% + 10 mA

0.05% + 15 mA

0.05% + 30 mA

0.05% + 1.5 mA

0.05% + 8 mA

0.05% + 25 mA

0.05% + 150 mA

0.03% + 150 mA

0.1% + 1.5 VA + 1.2 mVA/V

0.1% + 2 VA + 1.2 mVA/V

0.1% + 6 VA + 1.2 mVA/V

0.1% + 1.5 VA + 12 mVA/V

0.1% + 2 VA + 12 mVA/V

0.1% + 6 VA + 12 mVA/V

0.1% + 0.3 W + 1.2 mW/V

0.1% + 1.2 W + 1.2 mW/V

0.1% + 2.5 W + 1.2 mW/V

0.1% + 0.3 W + 12 mW/V

0.1% + 1.2 W + 12 mW/V

0.1% + 2.5 W + 12 mW/V

0.01

0.03% + 100 mV + 0.2%/kHz

0.03% + 1.5 mA

0.03% + 1 mA + 0.2%/kHz

0.05% + 5 mA

0.03% + 3 mA + 0.2%/kHz

Specifications - A

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 HP 6811B HP 6812B HP 6813B

ac Input Voltage Range (Vac):

Maximum Input Current (rms):

7.5 A (200/208 Vac),

Maximum Input Power: ac Input Frequency: Isolation to Ground: Output Voltage Risetime:

(output change from 10 to 90% or 90 to 10% of its total excursion with full resistive load)

Remote Inhibit Response Time: Remote Sense Capability: Programmable Output Impedance Ranges

Resistance: Inductance:

Average Programming Accuracy

rms Current: OVP: ac Voltage Slew Rate (rms): Frequency Slew Rate:

Average Programming Resolution

rms Voltage: dc Voltage: ac Voltage Slew Rate (rms): dc Voltage Slew Rate: Frequency Slew Rate: Overvoltage Programming (OVP): rms Current: peak Current: Output Frequency: Output Impedance

Resistive Component: Inductive Component:

Average Measurement Resolution

rms Voltage: rms Current:

THD (for a fundamental amplitude ≥ 5% of full scale): Measurement System

Measurement Buffer Length: Measurement/Generation Synchronization: Measurement Acquisition Sampling Rate

Range:

Voltage/Current Digitization Accuracy: Voltage/Current Digitization Resolution: Harmonic Measurement Time (amplitude):

Meas:Curr:Harm? <n> Meas:Array:Curr:Harm?

87−106 Vac (100 Vac nom.)

104−127 Vac (120 Vac nom.)

174−220 Vac (200/208 Vac nom.)

191−254 Vac (230 Vac nom.)

12 A (100 Vac), 10 A (120 Vac),

6.5 A (230 Vac)

1000 VA/700 W 2500 VA/1400 W 3800 VA/2600 W

Up to 1 Vrms can be dropped across each load lead.

2 mA 4 mA 4 mA

12.5 mA 25 mA 25 mA

28 A (100 Vac), 24 A (120 Vac),

15 A (200/208 Vac),

13A (230 Vac)

47−63 Hz

300 Vrms/425 Vdc

50 µs

15 ms

0−1 Ω

20 µH−1 mH

1.2% of output + 50 mA 2% of output + 5 Vpeak

0.1 V/s

± 0.01%

125 mV 250 mV

6 mV/s

20 mV/s

0.05 Hz/s 2 Vpeak

10 µHz

0.01 Ω 10 µH

10 mV

2 mA

5% of reading + 0.1%

4096 points

≤ 50 µs

25−250 µs

12 bits

16 bts

400 ms

10 s

174−220 Vac

(200/208 Vac nom.)

191−254 Vac

(230 Vac nom.)

20 A (230 Vac)

22 A (200/208 Vac)

A - Specifications

Table A-2. Supplemental Characteristics (continued)

Parameter HP 6811B HP 6812B HP 6813B

Transient System

Phase Synchronization: Pulse Width Range: Pulse/Dwell Timing Accuracy: Pulse Duty Cycle Range: Pulse Count Range: LIST Length: Minimum LIST Dwell Time:

LIST Count Range: External Trigger Response Time: Maximum External Trigger Rate: Waveform Table Voltage Resolution: RS-232 Interface Capabilities

Baud Rates:

Data Format:

Language:

Trig In/Trig Out Characteristics

Trig Out (HC TTL output):

Trig In (10k pullup):

INH/FLT Characteristics

Maximum Ratings:

INH Terminals:

FLT Terminals:

Saveable Data (nonvolatile)

Instrument States:

User-defined waveforms

List data: HP-IB Interface Capabilities

Language:

Interface:

Programming Time: Recommended Calibration Interval: Regulatory Compliance

Listed to:

Certified to:

Conforms to: RFI Suppression Complies with: Dimensions

Height (add 12.7 mm or 0.5 in. for feet)

Width:

Depth: Net Weight: Shipping Weight:

± 100 µs

200 µs to 4.3 x 105 seconds

± 0.01%

0 to 100 %

1 to Infinity Pulses

1 to 100 steps

200 µs

1 to Infinity LIST repeats

200 µs

1 kHz

1024 points

300, 600, 1200, 2400, 4800, 9600

7 bits even or odd parity; 8 bits without parity

SCPI (Standard Commands for Programmable Instruments),

Elgar 9012 PIP

Vol = 0.8 max. @ 1.25 mA

Voh = 3.3 V max. @ 1.25 mA

Vil = 0.8 V max.

Vih = 2 V max.

16.5 Vdc between INH terminals; FLT terminals; and from INH terminals to chassis ground

= 1.25 mA max.

Vol = 0.5 Vmax.

Vil = 0.8 V max.

Vih = 2 V min.

tw = 100 µs min.

td = 4 ms typical

16 (0 to 15)

12 (with 1024 data points in each)

1 to 100 steps (for each list function)

SCPI, Elgar 9012 PIP

AH1, C0, DC1, DT1, E2, LE1, PP0, RL1, SH1, SR1, TE6

10 ms

1 year

UL 3111-1

CSA 22.2 No. 1010-1

IEC 1010

CISPR-11, Group 1, Class A

132.6 mm (5.25 in.)

425.5 mm (16.75 in.)

574.7 mm (22.6 in.)

28.2 kg (62 lb) 32.7 kg (72 lb)

31.8 kg (70 lb) 36.4 kg (80 lb)

Specifications - A

10 Hz

246810

10 Hz

110100

Frequency

1.75

45 Hz05 Hz

020304010

2% error at 10 Hz

100

Frequency

110

0.1%error @ 40Hz

1%error @ 10Hz

Operation Below 45 Hz

The following operating characteristics apply for output frequencies between 45Hz and 1Hz. Below 1 Hz, instantaneous values meet the dc specifications. The ac source output is set to: sinewave, dc coupled, realtime regulation, and is connected to a linear load.

Table A-3. Operation Below 45 Hz

Real Power (watts)

1750 750 375

675 287 142

5 Hz

Reactive power (VA)

1750 750 375

Frequency (linear scale)

RMS current derating (A)

6.5

3.75

3.5

AC coupled frequency response (dB)

30% error @ 2Hz (-3dB point)

-10

-20

slope of 1 (20dB/decade)

6 8

Frequency (linear scale)

RMS current programming accuracy (% error)

Frequency

Meets Measurement Accuracy specifications under the following conditions: Minimum Maximum allowable

measured frequency component

Sample rate frequency to avoid aliasing 25 µs 45 Hz 20 kHz 50 µs 22.5 Hz 10 kHz 100 µs 11.25 Hz 50 kHz 200 µs 5.625 Hz 2.5 kHz 250 µs 4.5 Hz 2 kHz

(Anti aliasing filters have a corner frequency of 12.5 kHz.)

Verification and Calibration

Introduction

This appendix includes verification and calibration procedures for the HP 6811B/6812B/6813B AC Power Solutions. Instructions are given for performing the procedures either from the front panel or from a controller over the HP-IB.

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

Because the output of the ac source must be enabled during verification or calibration, proceed with caution, since voltages and currents will be active at the output terminals.

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

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

WARNING LETHAL VOLTAGES. Ac sources can supply 424 V peak at their output. DEATH

on contact may result if the output terminals or circuits connected to the output are touched when power is applied. These procedures must be performed by a qualified electronics technician or engineer trained on this equipment.

Equipment Required

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

B - Verification and Calibration

Table B-1. Equipment Required

Equipment Characteristics Recommended Model

Digital Voltmeter

Current Monitor

Ratio Transformer

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

0.01 Ω, ±200 ppm, 10 Watts

30:1 ratio, 50 ppm, 45 Hz to 1 kHz

HP 3458A

Guildline 7320/0.01

Load Resistor Impedance Resistor HP-IB Controller

The 4- terminal current shunt is used to eliminate output current measurement error caused by voltage drops in

20 Ω, 10 A, 1800 Watts min. 1 Ω, 100 Watts min. Full HP-IB capabilities HP Series 200/300 or equivalent

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.

A ratio transformer is required only when verifying output voltage readback to MIL-STD-45662A 4:1 test

equipment ratio requirements.

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 2).

HP 6811B/6812B/6813B

HP3458A

DMM

SENSE

COM

HP3458A

DMM

R = Load resistor for CC test (8 ohms)

Rs = Current Monitor resistor ( 0.01 ohms )

Rz = Impedance resistor ( 1 ohm )

S1 = Switch is for convenience (not required).

Figure B-1. Verification & Calibration Test Setup

Verification and Calibration - B

Performing the Verification Tests

The following procedures assume you understand how to operate the ac source from the front panel as explained in chapter 4.

When performing the verification tests from an HP-IB controller, you may have to consider the relatively slow settling times and slew rates of the ac source as compared to computer and system voltmeters. Suitable WAIT statements can be inserted into the test program to give the ac 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 Measurement Accuracy

Turn-On Checkout Procedure

Perform the Turn-On Checkout as directed in chapter 3.

NOTE: The ac source must pass turn-on selftest before you can proceed with the verification tests.

AC Voltage Programming and Measurement Accuracy

This test verifies the voltage programming, HP-IB measurement, and front panel meter functions. Values read back over the HP-IB should be the same as those displayed on the front panel.

If more than one meter or if a meter and an oscilloscope are used, connect each to the sense terminals by separate leads to avoid mutual coupling effects.

Action Normal Result

1. Make sure the ac source is turned off. Connect the DVM and ratio transformer as shown in the test setup in Figure B-1.

2. Turn on the ac source with no load. In the Output menu, execute the *RST command to reset the unit. Enable the output by pressing Output On/Off. Program the output voltage as follows:

VOLT 300, FREQ 45, SHAPE:SIN, CURR 1

3. Record voltage readings at the DVM1 and on the front panel display.

4. Program FREQ 400

5. Record voltage readings at the DVM1 and on the front panel display.

4. Program FREQ 1000, CURR:PEAK 40

7. Record voltage readings at the DVM1 and on the front panel display.

Multiply the DVM reading by the transformer ratio if a ratio transformer is used.

CV annunciator on.

Output current near 0.

Readings within specified High

range limits (300 V/45 Hz).

Readings within specified High

range limits (300 V/400 Hz).

Readings within specified High

range limits (300 V/1 kHz).

B - Verification and Calibration

DC Voltage Programming and Measurement Accuracy

CAUTION: Disconnect the ratio transformer for this test.

This test verifies the dc voltage programming, HP-IB readback, and front panel meter functions. Values read back over the HP-IB should be the same as those displayed on the front panel. Connect the negative terminal of the DVM to the COM output terminal to determine the ± dc offset voltages.

Action Normal Result

1. Make sure the ac source is turned off. Connect the DVM directly to the sense terminals.

2. Turn on the ac source with no load. In the Output menu, execute the *RST command to reset the unit. Enable the output by pressing Output On/Off. Program the output voltage as follows:

VOLT 0, OUTP:COUP DC, OFFSET 425

3. Record DC voltage readings at the DVM and on the front panel display.

Program OFFSET −425 Output voltage at −425 Vdc

5. Record DC voltage readings at the DVM and on the front panel display.

Output voltage at +425 Vdc

Output current near 0.

Readings within specified dc

voltage programming and readback

limits.

Readings within specified dc

voltage programming and readback

limits.

RMS Current Accuracy Test

This test verifies the accuracy of the current measurement in rms detection mode.

Action Normal Result

1. Turn off the ac source and connect the DVM, the 20 ohm load resistor and current shunt as shown in Figure B-1 with S1 closed. Connect the DVM across the current shunt.

2. Turn on the ac source. In the Output menu, execute the *RST command to reset the unit. Enable the output by pressing Output On/Off. Program the output as follows:

For HP 6811B: VOLT 50, CURR:RANGE LOW, CURR:LEV 3.00

For all other models: VOLT 50, CURR:RANGE LOW, CURR:LEV 5.00

3. Record the DVM voltage reading and calculate the rms current. Readings within specified limits.

4. Program CURR:RANGE HIGH

5. Record the DVM voltage reading and calculate the rms current. Readings within specified limits.

CC annunciator on

Output current at 3.0 (HP 6811B)

or 5.0 A (all other models).

CC annunciator on

Output current at 3.0 (HP 6811B)

or 5.0 A (all other models).

Verification and Calibration - B

Table B-2. HP 6811B Verification Test Record

Model HP 6811B Report No.____________ Date_____________

Test Description Minimum

Voltage Programming and Measurement Accuracy

300 Vrms accuracy at 45 Hz Front Panel Measurement

300 Vrms accuracy at 400 Hz Front Panel Measurement

300 Vrms accuracy at 1 kHz Front Panel Measurement

DC Programming and Measurement Accuracy

425 Vdc accuracy Front Panel Measurement

−425 Vdc accuracy

Front Panel Measurement

Low Range High Range (Iout = calculated output current @ 60Hz)

Recorded Results Maximum

Specification

299.250 V

Vrms −190 mV

298.200 V

Vrms −190 mV

296.700 V

Vrms −400 mV

424.075 V

Vdc −0.277 V

−424.075 V

Vdc −0.277 V

RMS Current Measurement Accuracy

Iout −0.0039 A Iout −0.0095 A

_______V _______V

_______A _______A

Specification

300.750 V

Vrms +190 mV

301.800 V

Vrms +190 mV

303.300 V

Vrms +400 mV

425.925 V

Vrms +0.277 V

−425.925 V

Vrms +0.277 V

Iout +0.0039 A Iout +0.0095 A

Model HP ______________________ Report No.____________ Date_____________

Test Description Minimum

300 Vrms accuracy at 45 Hz Front Panel Measurement

300 Vrms accuracy at 400 Hz Front Panel Measurement

300 Vrms accuracy at 1 kHz Front Panel Measurement

Table B-3. HP 6812B Verification Test Record

Recorded Results Maximum

Specification

Voltage Programming and Measurement Accuracy

299.250 V

Vrms −190 mV

298.200 V

Vrms −190 mV

296.700 V

Vrms −400 mV

_______V _______V

Specification

300.750 V

Vrms +190 mV

301.800 V

Vrms +190 mV

303.300 V

Vrms +400 mV

B - Verification and Calibration

DC Programming and Measurement Accuracy

Table B-3 (continued)

425 Vdc accuracy Front Panel Measurement

−425 Vdc accuracy

Front Panel Measurement

Low Range High Range (Iout = calculated output current @ 60Hz)

Table B-4. HP 6813B Verification Test Record

Model HP ______________________ Report No.____________ Date_____________

Test Description Minimum

Voltage Programming and Measurement Accuracy

424.075 V

Vdc −0.277 V

−424.075 V

Vdc −0.277 V

RMS Current Measurement Accuracy

Iout −0.0045 A Iout −0.0175 A

Specification

_______V _______V

_______A _______A

Recorded Results Maximum

425.925 V

Vrms +0.277 V

−425.925 V

Vrms +0.277 V

Iout +0.0045 A Iout +0.0175 A

Specification

300 Vrms accuracy at 45 Hz Front Panel Measurement

300 Vrms accuracy at 400 Hz Front Panel Measurement

300 Vrms accuracy at 1 kHz Front Panel Measurement

DC Programming and Measurement Accuracy

425 Vdc accuracy Front Panel Measurement

−425 Vdc accuracy

Front Panel Measurement

Low Range High Range (Iout = calculated output current @ 60Hz)

299.250 V

Vrms −190 mV

298.200 V

Vrms −190 mV

296.700 V

Vrms −400 mV

422.575 V

Vdc −0.277 V

−422.575 V

Vdc −0.277 V

RMS Current Measurement Accuracy

Iout −0.0045 A Iout −0.0175 A

_______V _______V

_______A _______A

300.750 V

Vrms +190 mV

301.800 V

Vrms +190 mV

303.300 V

Vrms +400 mV

427.425 V

Vrms +0.277 V

−427.425 V

Vrms +0.277 V

Iout +0.0045 A Iout +0.0175 A

Verification and Calibration - B

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Performing the Calibration Procedure

Table B-1 lists the equipment required for calibration. Figure B-1 shows the test setup.

NOTE: You do not have to do a complete calibration each time. You may calibrate only the

voltage or current and proceed to "Saving the Calibration Constants." However, before you calibrate OVP, you must first calibrate the output voltage.

The following parameters may be calibrated:

♦ ac output voltage ♦ output voltage measurement ♦ overvoltage protection (OVP) ♦ ac output current ♦ output current measurement ♦ output impedance

Before calibrating the output impedance, you must first calibrate the output voltage and the output curent.

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, P2, P3, or P4). CAL:DATA <value> Input a calibration measurement.

CAL:VOLT:OFFSET Begin voltage offset calibration CAL:VOLT:DC Begin dc voltage calibration sequence CAL:VOLT:AC Begin ac voltage calibration sequence CAL:VOLT:PROT Begin voltage protection calibration CAL:CURR:AC Begin ac current calibration sequence CAL:CURR:MEAS Begin current measurement calibration sequence CAL:IMP Begin output impedance 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 command list. Use and to scroll through the parameter list.

B - Verification and Calibration

Front Panel Calibration

WARNING LETHAL VOLTAGES. Ac sources can supply 424 V peak at their output. DEATH

The following procedures assume you understand how to operate front panel keys (see chapter 4).

Enable Calibration Mode

Action Display

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

2. To begin calibration press Shift Cal, scroll to CAL ON and press Enter. CAL ON 0.0

3. 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.)

*RST

CAL DENIED

OUT OF RANGE

Calibrating and Entering Voltage Offset Values

Connect the negative terminal of the DVM to the COM output terminal. Note that some calibration points are negative; be sure to enter the CAL:DATA as negative values when required.

Action Display

4. Connect the DVM (dc volts mode) directly to the ac source. Do not

connect the ratio transformer or load resistor shown in Figure B-1.

5. Press Shift Calibration, scroll to the CAL VOLT OFFSET command,

and press Enter.

CAL:VOLT:OFFSET

6. Press Shift Calibration, scroll to the CAL LEV P1 command, and press

Enter to select the first calibration point.

7. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry

keypad to enter the dc voltage value displayed on the DVM.

8. Press Shift Calibration, scroll to the CAL LEV P1 command, use È to

scroll to the P2 parameter, and press Enter. This selects the second calibration point.

9. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry

keypad to enter the dc voltage value displayed on the DVM.

10. Press Shift Calibration, scroll to the CAL LEV P1 command, use È to

scroll to the P3 parameter, and press Enter.

CAL:LEV P1

CAL:DATA 0.00

CAL:LEV P2

CAL:DATA 0.00

CAL:LEV P3

Verification and Calibration - B

11. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry

keypad to enter the dc voltage value displayed on the DVM.

12. Press Shift Calibration, scroll to the CAL LEV P1 command, use È to

scroll to the P4 parameter, and press Enter.

13. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry

keypad to enter the dc voltage value displayed on the DVM.

CAL:DATA 0.00

CAL:LEV P4

CAL:DATA 0.00

The ac source is now holding the new voltage offset calibration constants in RAM.

Calibrating and Entering DC Voltage Gain Values

Connect the negative terminal of the DVM to the COM output terminal. Note that some calibration points are negative; be sure to enter the CAL:DATA as negative values when required.

Action Display

14. Connect the DVM (dc volts mode) directly to the ac source. Do not

connect the ratio transformer or load resistor shown in Figure B-1.

15. Press Shift Calibration, scroll to the CAL VOLT DC command, and

press Enter.

16. Press Shift Calibration, scroll to the CAL LEV P1 command, and press

Enter to select the first calibration point.

17. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry

keypad to enter the dc voltage value displayed on the DVM.

CAL:VOLT:DC

CAL:LEV P1

CAL:DATA 0.00

18. Press Shift Calibration, scroll to the CAL LEV P1 command, use È to

scroll to the P2 parameter, and press Enter. This selects the second calibration point.

19. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry

keypad to enter the dc voltage value displayed on the DVM.

20. Press Shift Calibration, scroll to the CAL LEV P1 command, use È to

scroll to the P3 parameter, and press Enter.

21. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry

keypad to enter the dc voltage value displayed on the DVM.

The ac source is now holding the new dc voltage gain calibration constants in RAM.

Calibrating and Entering AC rms Voltage Gain Values

Action Display

22. Connect the DVM (ac volts mode) to the ac source using the ratio

transformer shown in Figure B-1.

23. Press Shift Calibration, scroll to the CAL VOLT AC command, and

press Enter.

24. Press Shift Calibration, scroll to the CAL LEV P1 command, and press

Enter to select the first calibration point.

25. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry

keypad to enter the product of the transformer ratio times the ac voltage value displayed on the DVM.

CAL:LEV P2

CAL:DATA 0.00

CAL:LEV P3

CAL:DATA 0.00

CAL:VOLT:AC

CAL:LEV P1

CAL:DATA 0.00

B - Verification and Calibration

26. Press Shift Calibration, scroll to the CAL LEV P1 command, use È to

scroll to the P2 parameter, and press Enter. This selects the second calibration point.

27. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry

keypad to enter the product of the transformer ratio times the ac voltage value displayed on the DVM.

28. Press Shift Calibration, scroll to the CAL LEV P1 command, use È to

scroll to the P3 parameter, and press Enter.

29. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry

keypad to enter the product of the transformer ratio times the ac voltage value displayed on the DVM.

30. Press Shift Calibration, scroll to the CAL LEV P1 command, use È to

scroll to the P4 parameter, and press Enter.

31. Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry

keypad to enter the product of the transformer ratio times the ac voltage value displayed on the DVM.

The ac source is now holding the new ac rms voltage calibration constants in RAM.

Calibrating the OVP Trip Point

Action Display

CAL:LEV P2

CAL:DATA 0.00

CAL:LEV P3

CAL:DATA 0.00

CAL:LEV P4

CAL:DATA 0.00

32. Press Shift Calibration, scroll to CAL VOLT PROT, and press Enter. CAL:VOLT:PROT

33. Wait for the ac source to compute the OVP calibration constant. The

display returns to Meter mode when the OVP calculation is complete.

The ac source is now holding the new OVP calibration constants in RAM.

Calibrating and Entering rms Current Values

Action Display

34. Connect the DVM (ac rms mode), current shunt, and load resistor as

shown in figure B-1 with S1 closed.

35. Press Shift Calibration, scroll to the CAL CURR AC command, and

press Enter.

36. Press Shift Calibration, scroll to the CAL LEV P1 command, and press

Enter.

37. Press Shift Calibration, scroll to the CAL DATA 0.00 command.

Calculate the rms current value (DVM ac rms voltage/shunt resistance), and use the Entry keypad to enter the rms current.

38. Press Shift Calibration, scroll to the CAL LEV P1 command, use È to

scroll to the P2 parameter, and press Enter.

39. Press Shift Calibration, scroll to the CAL DATA 0.00 command.

Calculate the rms current value (DVM ac rms voltage/shunt resistance), and use the Entry keypad to enter the rms current.

CAL:CURR:AC

CAL:LEV P1

CAL:DATA 0.00

CAL:LEV P2

CAL:DATA 0.00

The ac source is now holding the new rms current calibration constants in RAM.

Verification and Calibration - B

Calibrating and Entering rms Current Measurement Values

Action Display

40. Connect the DVM (ac rms mode), current shunt, and load resistor as

shown in figure B-1 with S1 closed.

41. Press Shift Calibration, scroll to the CAL CURR MEAS command, and

press Enter.

42. Press Shift Calibration, scroll to the CAL LEV P1 command, and press

Enter.

43. Press Shift Calibration, scroll to the CAL DATA 0.00 command.

Calculate the rms current value (DVM ac rms voltage/shunt resistance), and use the Entry keypad to enter the rms current.

44. Press Shift Calibration, scroll to CAL LEV P1 command, use È to

scroll to the P2 parameter, and press Enter.

45. Press Shift Calibration, scroll to the CAL DATA 0.00 command.

Calculate the rms current value (DVM ac rms voltage/shunt resistance), and use the Entry keypad to enter the rms current.

CAL:CURR:MEAS

CAL:LEV P1

CAL:DATA 0.00

CAL:LEV P2

CAL:DATA 0.00

The ac source is now holding the new rms current measurement calibration constants in RAM.

Calibrating the Output Impedance

Action Display

46. Connect only the output impedance resistor across the output of the ac

source. Do not connect any other equipment.

47. Press Shift Calibration, scroll to the CAL IMP command, and press

Enter.

CAL:IMP

48. Wait for the ac source to compute the output impedance calibration

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

The ac source is now holding the new output impedance calibration constants in RAM.

Saving the Calibration Constants

CAUTION: 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 ac source calibration will then remain unchanged.

Action Display

49. Press Shift Calibration, scroll to CAL SAVE, and press Enter. CAL:SAVE

50. Press Shift Calibration, select CAL OFF, and press Enter to exit

Calibration mode. *RST and *RCL will also set the calibration state to OFF.

CAL OFF

B - Verification and Calibration

Changing the Calibration Password

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

Action Display

1. Begin by pressing Shift Cal and scrolling to the CAL ON command. CAL ON 0.0

2. Enter the existing password from Entry keypad and press Enter

3. Press Shift Cal and scroll to the CAL PASS command. CAL:PASS 0

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).

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

password to 0 (zero).

Calibration Error Messages

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

Table B-5. HP-IB Calibration Error Messages

Error Meaning

401 CAL switch prevents calibration (This is a hardware disable, see the ac source 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

Calibration Over the HP-IB

You can calibrate the ac 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.

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

HP Calibration Program Listing

Figure B-2, Sheets 1 through 3, lists the calibration program. This program can be run on any controller operating under HP BASIC. The assumed power supply address is 705 and calibration password is 0. If required, change these parameters in the appropriate statements.

Verification and Calibration - B

10 ! 20 ! AC Source calibration program Rev B.00.00 30 ! 40 ASSIGN @Ac TO 705 50 ! 60 PRINT TABXY(5,5),"This program will calibrate the 6811B/12B/13B AC Power Solutions." 70 PRINT TABXY(5,7),"Equipment requirements are: HP3458A or equivalent DVM" 80 PRINT TABXY(37,8),"0.01 ohm <200ppm Current Shunt" 90 PRINT TABXY(37,9),"20 ohm >1800 watt power resistor for all models" 100 PRINT TABXY(37,10),"1 ohm >100 watt impedance resistor" 110 PRINT TABXY(37,11),"30:1 <50ppm Ratio Transformer" 120 PRINT TABXY(3,13),"Ratio Transformer is required to when calibrating to MIL-STD-45662A. If the" 130 PRINT TABXY(2,14),"ratio transformer is not used the measurement uncertainty must be recalculated." 140 ! 150 DISP "Press CONT to continue" 160 PAUSE 170 CLEAR SCREEN 180 PRINT TABXY(15,5),"1. Turn the AC Source off" 190 PRINT TABXY(15,7),"2. Disconnect all loads" 200 PRINT TABXY(15,9),"3. Connect the 3458A to the rear terminal block" 210 PRINT TABXY(15,11),"4. Set the 3458A to DC VOLTS" 220 PRINT TABXY(15,13),"5. Turn on the AC Source" 230 ! 240 DISP "Press CONT to begin DC OFSET and DC GAIN calibration" 250 PAUSE 260 CLEAR SCREEN 270 PRINT TABXY(25,5),"CALIBRATING VOLTAGE OFFSET" 280 PRINT TABXY(20,7),"There are 4 points to be calibrated" 290 OUTPUT @Ac;"CAL:STATE ON" 300 OUTPUT @Ac;"CAL:VOLT:OFFS" 310 OUTPUT @Ac;"CAL:LEV P1" 320 WAIT 10 330 INPUT "Enter DC offset voltage reading from DVM",Off_p1 340 PRINT TABXY(25,9),"Point 1 entered" 350 OUTPUT @Ac;"CAL:DATA";Off_p1 360 OUTPUT @Ac;"CAL:LEV P2" 370 WAIT 10 380 INPUT "Enter DC offset voltage reading from DVM",Off_p2 390 PRINT TABXY(25,11),"Point 2 entered" 400 OUTPUT @Ac;"CAL:DATA";Off_p2 410 OUTPUT @Ac;"CAL:LEV P3" 420 WAIT 10 430 INPUT "Enter DC offset voltage reading from DVM",Off_p3 440 PRINT TABXY(25,13),"Point 3 entered" 450 OUTPUT @Ac;"CAL:DATA";Off_p3 460 OUTPUT @Ac;"CAL:LEV P4" 470 WAIT 10 480 INPUT "Enter DC offset voltage reading from DVM",Off_p4 490 PRINT TABXY(25,15),"Point 4 entered" 500 OUTPUT @Ac;"CAL:DATA";Off_p4 510 WAIT 3 520 CLEAR SCREEN 530 PRINT TABXY(25,5),"CALIBRATING DC VOLTAGE GAIN" 540 PRINT TABXY(20,7),"There are 3 points to be calibrated" 550 OUTPUT @Ac;"CAL:VOLT:DC"

Figure B-2. Calibration Program Listing (Sheet 1 of 3)

B - Verification and Calibration

560 OUTPUT @Ac;"CAL:LEV P1" 570 WAIT 10 580 INPUT "Enter DC voltage reading from DVM",Dc_p1 590 PRINT TABXY(25,9),"Point 1 entered" 600 OUTPUT @Ac;"CAL:DATA";Dc_p1 610 OUTPUT @Ac;"CAL:LEV P2" 620 WAIT 10 630 INPUT "Enter DC voltage reading from DVM",Dc_p2 640 PRINT TABXY(25,11),"Point 2 entered" 650 OUTPUT @Ac;"CAL:DATA";Dc_p2 660 OUTPUT @Ac;"CAL:LEV P3" 670 WAIT 10 680 INPUT "Enter DC voltage reading from DVM",Dc_p3 690 PRINT TABXY(25,13),"Point 3 entered" 700 OUTPUT @Ac;"CAL:DATA";Dc_p3 710 WAIT 3 720 CLEAR SCREEN 730 PRINT TABXY(5,10),"1. Connect the 3458A to the rear terminals via the ratio transformer" 740 PRINT TABXY(18,12),"2. Set the 3458A to AC VOLTS" 750 ! 760 DISP "Press CONT to begin AC PROGRAMMING and MEASUREMENT calibration" 770 PAUSE 780 CLEAR SCREEN 790 PRINT TABXY(18,5),"CALIBRATING AC POGRAMMING and MEASUREMENT" 800 PRINT TABXY(20,7),"There are 4 points to be calibrated" 810 OUTPUT @Ac;"CAL:VOLT:AC" 820 OUTPUT @Ac;"CAL:LEV P1" 830 WAIT 10 840 INPUT "Enter AC rms ( transformer ratio * DVM reading)",Ac_p1 850 PRINT TABXY(25,9),"Point 1 entered" 860 OUTPUT @Ac;"CAL:DATA";Ac_p1 870 OUTPUT @Ac;"CAL:LEV P2" 880 WAIT 10 890 INPUT "Enter AC rms ( transformer ratio * DVM reading)",Ac_p2 900 PRINT TABXY(25,11),"Point 2 entered" 910 OUTPUT @Ac;"CAL:DATA";Ac_p2 920 OUTPUT @Ac;"CAL:LEV P3" 930 WAIT 10 940 INPUT "Enter AC rms ( transformer ratio * DVM reading)",Ac_p3 950 PRINT TABXY(25,13),"Point 3 entered" 960 OUTPUT @Ac;"CAL:DATA";Ac_p3 970 OUTPUT @Ac;"CAL:LEV P4" 980 WAIT 3 990 INPUT "Enter AC rms ( transformer ratio * DVM reading)",Ac_p4 1000 PRINT TABXY(25,15),"Point 4 entered" 1010 OUTPUT @Ac;"CAL:DATA";Ac_p4 1020 WAIT 10 1030 CLEAR SCREEN 1040 PRINT TABXY(15,10),"CALIBRATING OVERVOLTAGE PROTECTION" 1050 OUTPUT @Ac;"CAL:VOLT:PROT" 1060 PRINT TABXY(30,15),"WAIT" 1070 WAIT 30 1071 OUTPUT @Ac;"CAL:SAVE" 1072 OUTPUT @Ac;"CAL:STATE OFF" 1080 CLEAR SCREEN 1090 PRINT TABXY(15,5),"1. Turn off the AC Source" 1100 PRINT TABXY(15,7),"2. Connect the current shunt and 20 ohm load resistor, see fig.B-1"

Figure B-2. Calibration Program Listing (Sheet 2 of 3)

Verification and Calibration - B

1110 PRINT TABXY(15,9),"3. Connect the 3458A across the current shunt" 1120 PRINT TABXY(15,11),"4. Set the 3458A to AC rms VOLTS" 1130 PRINT TABXY(15,13),"5. Turn on the AC Source" 1140 ! 1150 DISP "Press CONT to begin Current Program and Measurement calibration" 1160 PAUSE 1170 CLEAR SCREEN 1180 PRINT TABXY(22,5),"CALIBRATING CURRENT POGRAMMING" 1190 PRINT TABXY(20,7),"There are 2 points to be calibrated" 1191 OUTPUT @Ac;"CAL:STATE ON" 1200 OUTPUT @Ac;"CAL:CURR:AC" 1210 OUTPUT @Ac;"CAL:LEV P1" 1220 WAIT 10 1230 INPUT "Enter AC rms current ( DVM reading divided by shunt resistance )",Ai_p1 1240 PRINT TABXY(25,9),"Point 1 entered" 1250 OUTPUT @Ac;"CAL:DATA";Ai_p1 1260 OUTPUT @Ac;"CAL:LEV P2" 1270 WAIT 10 1280 INPUT "Enter AC rms current ( DVM reading divided by shunt resistance )",Ai_p2 1290 PRINT TABXY(25,11),"Point 2 entered" 1300 OUTPUT @Ac;"CAL:DATA";Ai_p2 1310 WAIT 10 1320 CLEAR SCREEN 1330 PRINT TABXY(22,5),"CALIBRATING CURRENT MEASUREMENT" 1340 PRINT TABXY(20,7),"There are 2 points to be calibrated" 1350 OUTPUT @Ac;"CAL:CURR:MEAS" 1360 OUTPUT @Ac;"CAL:LEV P1" 1370 WAIT 10 1380 INPUT "Enter AC rms current ( DVM reading divided by shunt resistance )",Am_p1 1390 PRINT TABXY(25,9),"Point 1 entered" 1400 OUTPUT @Ac;"CAL:DATA";Am_p1 1410 OUTPUT @Ac;"CAL:LEV P2" 1420 WAIT 10 1430 INPUT "Enter AC rms current ( DVM reading divided by shunt resistance )",Am_p2 1440 PRINT TABXY(25,11),"Point 2 entered" 1450 OUTPUT @Ac;"CAL:DATA";Am_p2 1460 WAIT 10 1470 OUTPUT @Ac;"CAL:SAVE" 1480 OUTPUT @Ac;"CAL:STATE OFF" 1490 CLEAR SCREEN 1500 ! 1510 ! 1520 PRINT TABXY(15,5),"1. Turn off the AC Source" 1530 PRINT TABXY(15,7),"2. Disconnect all equipment from the AC Source" 1540 PRINT TABXY(15,9),"3. Connect the 1 ohm impedance resistor, see fig.B-1" 1550 PRINT TABXY(15,11),"4. Turn on the AC Source" 1560 ! 1570 DISP "Press CONT to begin Output Impedance calibration" 1580 PAUSE 1590 PRINT TABXY(15,10),"CALIBRATING OUTPUT IMPEDANCE" 1600 OUTPUT @Ac;"CAL:STATE ON" 1610 OUTPUT @Ac;"CAL:IMP" 1620 PRINT TABXY(30,15),"WAIT" 1630 WAIT 30 1640 OUTPUT @Ac;"CAL:SAVE" 1650 OUTPUT @Ac;"CAL:STATE OFF" 1660 CLEAR SCREEN 1670 PRINT TABXY(25,10),"CALIBRATION COMPLETE" 1680 END

Figure B-2. Calibration Program Listing (Sheet 3 of 3)

Error Messages

Error Number List

This appendix gives the error numbers and descriptions that are returned by the ac 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:

Table C-1. Error Numbers

Error Number Error String [Description/Explanation/Examples]

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

–100 Command error [generic] –101 Invalid character –102 Syntax error [unrecognized command or data type] –103 Invalid separator –104 Data type error [e.g., "numeric or string expected, got block data"] –105 GET not allowed –108 Parameter not allowed [too many parameters] –109 Missing parameter [too few parameters] –112 Program mnemonic too long [maximum 12 characters] –113 Undefined header [operation not allowed for this device] –121 Invalid character in number [includes "9" in octal data, etc.] –123 Numeric overflow [exponent too large; exponent magnitude >32 k] –124 Too many digits [number too long; more than 255 digits received] –128 Numeric data not allowed –131 Invalid suffix [unrecognized units, or units not appropriate] –138 Suffix not allowed

–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

C - Error Messages

–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] –221 Settings conflict [check current device state] –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 WAVEFORM section checksum failed 5 Non-volatile RAM STATE section checksum failed 6 Non-volatile RAM LIST section checksum failed 7 Non-volatile RAM RST section checksum failed

10 RAM selftest

11 - 31 DAC selftest error, expected <n>, read <reading>

Errors 11, 12, 13, 14, 15 apply to DAC12 1A and 1B Errors 16, 17, 18 apply to DAC12 2A Errors 19, 20, 21 apply to DAC12 2B Errors 22, 23 apply to DAC12 4A Errors 24, 25 apply to DAC12 4B Errors 26, 27, 28 apply to DAC12 3A and 3B Errors 29, 30, 31 apply to DAC12 5A and 5B

Error Messages - C

40 Voltage selftest error, output 1 41 Voltage selftest error, output 2 42 Voltage selftest error, output 3 43 Current selftest error, output 1 44 Current selftest error, output 2 45 Current selftest error, output 3 70 Fan voltage failure 80 Digital I/O selftest error

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

200 Outgrd not responding 201 Front panel not responding 210 Ingrd receiver framing error 211 Ingrd uart overrun status 212 Ingrd received bad token 213 Ingrd receiver buffer overrun 214 Ingrd input buffer overrun 215 Outgrd output buffer overrun 216 RS-232 receiver framing error 217 RS-232 receiver parity error 218 RS-232 receiver overrun error 219 Ingrd inbuf count sync 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 600 Systems in mode:list have different list lengths 601 Requested voltage and waveform exceeds peak voltage capability 602 Requested voltage and waveform exceeds transformer volt-second rating 603 Command only applies to RS-232 interface 604 Trigger received before requested number of pre-trigger readings 605 Requested RMS current too high for voltage range 606 Waveform data not defined 607 VOLT, VOLT:SLEW, and FUNC:SHAP modes incompatible 608 Measurement overrange 609 Output buffer overrun 610 Command cannot be given with present SYST:CONF setting

Line Voltage Conversion

WARNING: Shock Hazard Hazardous voltage can remain inside the unit even after it has

been turned off. This procedure should only be done by qualified electronics service personnel.

Open the Unit

♦ Turn off the ac power to the unit and disconnect the power cord from the power outlet. ♦ Remove the four screws that secure the two carrying straps and outer cover (use a T25

Torx drive).

♦ Slightly spread the bottom rear of the cover and pull it back to remove it from the front

panel.

♦ Observe the two LEDs that are visible in the cutouts on each side of the unit. If either

LED is on, there is hazardous voltage inside the unit. Wait until the LED goes out

before proceeding (this may take several minutes).

Check the Jumper Wire (Model HP 6811B/6812B only)

♦ Locate the line voltage jumper wire in the cutout at the side of the unit by the line cord (see

Figure D-1).

♦ For 100 V or 120 V operation, install the jumper on the lug labeled:100/120.

For 200 V, 208 V or 230 V operation, install the jumper on the lug labeled: 200/220.

Check the Line Jumpers (all Models)

♦ Locate the line jumpers in the cutout at the side of the unit by the on/off switch. ♦ Configure the jumpers according to the line voltage shown in the accompanying label.

When configuring a unit for 208 V, use the jumper settings shown for 200 V.

Check the Power Transformer Connector (all Models)

NOTE: This procedure is only required if you are changing the input voltage between 100

V and 120 V or between 200/208 V and 230 V.

♦ Remove the screws securing the inner cover (use a T15 Torx drive). ♦ Remove the inner cover. ♦ Remove the screws securing the pc board behind the front panel (use a T15 Torx drive). ♦ You need only to lift the board out of the way, you do not need to disconnect any cables.

D - Line Voltage Conversion

♦ Locate the connector in front of the power transformer. ♦ For 100 V, 200 V, or 208 V operation, install the plug on the connector labeled: 200 V

input. For 120 V or 230 V operation, install the plug on the connector labeled: 240 V input.

♦ Replace the pc board and inner cover.

NOTE: Be sure to replace all of the screws removed in steps 9 and 11.

Close the Unit

♦ Replace the outer cover. ♦ Change the label on the rear panel to reflect the changed input voltage rating. ♦ Reconnect the power and turn on the unit.

NOTE: Line voltage conversion does not require any fuse changes.

RIGHT SIDE

(with cover removed)

100/120

200/220

JUMPER WIRE

!! WARNING !!

If LEDs are on,

HAZARDOUS

voltages are present!

Jumper Settings

100

120

J353

200 230

LINE JUMPERS

Figure D-1. Line Voltage Conversion Components

LEFT SIDE

(with cover removed)

INPUT

200V

INPUT

240V

POWER TRANSFORMER

Index

ac line conversion, 85 accessories, 12 airflow, 22 annunciators

φ1, 38 Addr, 38 Cal, 38 CC, 38 CV, 38 Dis, 38 Err, 38 OCP, 38 Prot, 38 Rmt, 38 Shift, 38 SRQ, 38 Tran, 38 Unr, 38

AWG ratings, 25

cables, 12 calibration, 71

ac rms voltage gain, 73 dc voltage gain, 73 enable, 72 equipment, 65 error messages, 76 menu, 71 output impedance, 75 OVP, 74 password, 76 program listing, 76 rms current, 74, 75 saving, 75 setup, 66

voltage offset, 72 capabilities, 14 cleaning, 21 conversion, ac line, 85

damage, 21 dc offset, 48 digital connections, 27 digital connector, 21 dimensions, 22

—A—

—C—

—D—

—E—

entry keys, 46

Å, 46

0 ... 9, 46 Clear Entry, 46 E, 46

Enter, 46 error messages, 34 error numbers, 81

—F—

features, 13 Fixed, 50 FLT connections, 27 frequency control, 14 front panel, 37

annuncuiators, 38

controls and indicators, 14, 37

keys, 38 function keys, 40

•, 40

•Index, 40

immediate action, 40

Output On/Off, 40

Phase Select, 40

Trigger, 40 fuses, 23

—G—

general information, 11 ground, earth, 12 guide, programming, 11 guide, user’s, 11

—H—

hazardous voltages, 65 history, 6 HP-IB, 58

address, 58

connections, 28

—I—

INH connections, 27 input

connections, 23

power, 12 inrush current capability, 17 inspection, 21

Index

—L—

lethal voltages, 65 line fuse

replacing, 35 line voltage conversion, 85 List, 50, 52 load regulation, 18 load voltage drops, 25 location, 22 low frequency operation (<45 Hz), 15, 63

—M—

manuals, 11, 21 measure

ac only, 48

ac+dc, 48

dc only, 48 meter

ac, 48

ac+dc, 48

dc, 48 Meter AC+DC, 38 meter display keys

Harmonic, 41

Input, 41

Meter, 41

—N—

non-volatile memory

clearing, 58

storing, 39

—O—

OCP, 49 offset, 48 operating features, 13 options, 12 OT, 49 output

ac+dc, 48

characteristic, 15

clearing output protection, 49

connections, 24

connector, 21

control keys

Output, 43 rating, 15 setting output protection, 49 setting the amplitude, 47 setting the dc offset, 48 setting the frequency, 48

Output AC+DC, 38 output checkout, 32 output control keys

Current, 42 Freq, 42

Phase, 43 Pulse, 43 Shape, 43 Voltage, 42

output coupling

ac, 19, 48 dc, 19, 48

output impedance

<1 ohm, 18 reactive, 18

real, 18 OV, 49 OVLD, 34

—P—

parts - operator replaceable, 13 peak current capability, 16 peak current limit, 16 peak inrush capacitance, 16 Peak Inrush current

measuring, 57 Phase synchronization, 53 power cord, 21

installation, 23 power receptacle, 12 preliminary checkout, 31 print date, 6 program listing

calibration, 76 protection

OCP, 49

OT, 49

OV, 49

Rail, 49

RI, 49

SOA, 49 protection/status keys

Protect, 44

Status, 44 Pulse, 51

—R—

rack mount kit, 12 rack mounting, 22 Rail, 49 real-time voltage regulation, 18 recalling operating states, 58 remote programming, 14 remote sensing, 25

OVP considerations, 27 repacking, 21 RI, 49 rms current limit, 18 rms voltage regulation, 18 RS-232, 58

connections

interface commands, 29

data format, 29

Index

handshake, 30 interface cable, 30 pinouts, 29

—S—

safety class, 12 safety summary, 3 safety warning, 12 saving operating states, 58 self-test, 31 selftest errors, 34 sense connections, 25 service guide, 12 shift annunciator, 32 shift key, 32 Slew rates

programming, 55 SOA, 49 SOA limit, 16 specifications, 59 Step, 50 supplemental characteristics, 61 SYSTem

LOCal, 29

REMote, 29

RWLock, 29 system errors, 81 system keys, 39

Address, 39

Error, 39

Interface, 39

Local, 39

RCL, 39

Save, 39

Shift, 39

—T—

transient voltage

fixed, 50 list, 50, 52 pulse, 51

step, 50 transient voltage mode, 50 trigger connections, 27 Trigger delays, 53 trigger IN, 27 trigger OUT, 27 trigger/list keys

List, 45

Trigger Control, 45 turn-on checkout, 31, 67

—V—

verification, 32

ac measurement accuracy, 67

ac voltage programming, 67

dc measurement accuracy, 68

dc voltage programming, 68

equipment, 65

rms current accuracy, 68

setup, 66

test record, 69 verification tests, 31 voltage control, 14 voltage regulation

real-time, 18

rms, 18

—W—

warranty, 2 Waveform

generation, 55 wire

current ratings, 25 wiring considerations, 25

Agilent 6811B Users Guide

Specifications and Main Features

Frequently Asked Questions

User Manual

Warranty Information

Safety Summary

Declaration Page

Acoustic Noise Information

Printing History

Table of Contents

General Information

Document Orientation

Options and Parts

Description

Front Panel/Remote Operation

Steady-state Output Characteristic

Peak Current/Dynamic Power Capability

RMS Current Limit Circuit

Voltage Regulation

Output Impedance

Output Coupling

Installation

Inspection

Location

Input Connections

Output Connections

Remote Sense Connections

Trigger Connections

Digital Connections

Controller Connections

Turn-On Checkout

Preliminary Checkout

Using the Keypad

Checkout Procedure

In Case of Trouble

Front panel Operation

Front Panel Description

System Keys

Function Keys

Entry Keys

Specifications

Supplemental Characteristics

Operation Below 45 Hz

Verification and Calibration

Performing the Verification Tests

Performing the Calibration Procedure

Front Panel Calibration

Changing the Calibration Password

Calibration Error Messages

Calibration Over the HP-IB

Error Messages

Error Number List

Line Voltage Conversion

Index