Agilent Technologies 6834B, 6814B, 6843A User Manual

User’s Guide

AC Power Solutions

Agilent Models 6814B, 6834B, and 6843A

For instruments with Serial Numbers:

Agilent 6814B: 3601A-00101 through 00270

US36010101-up

Agilent 6834B: 3601A-00101 through 00140

US36010101-up

Agilent 6843A: 3540A-00101 through 00140

US35400101-up

Agilent Part No. 5962-0887	Printed in U.S.A.
Microfiche No 5962-0888	December, 1998
	Update April 2000

Warranty Information

CERTIFICATION

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

WARRANTY

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

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

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

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

LIMITATION OF WARRANTY

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

EXCLUSIVE REMEDIES

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

ASSISTANCE

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

2

Safety Summary

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

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 III, 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.

DO NOT EXCEED INPUT RATINGS

Operation at line voltages or frequencies in excess of those stated on the line rating label may cause leakage currents in excess of 5.0 mA peak.

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

3

SAFETY SYMBOLS

WARNING

Caution

Direct current

Alternating current

Both direct and alternating current

Three-phase alternating current

Earth (ground) terminal

Protective earth (ground) terminal

Frame or chassis terminal

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

Terminal for Neutral conductor on permanently installed equipment

Terminal for Line conductor on permanently installed equipment

On (supply)

Off (supply)

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

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.

4

Declaration Page

DECLARATION OF CONFORMITY

according to ISO/IEC Guide 22 and EN 45014

Manufacturer’s Name:	Agilent Technologies, Inc.
Manufacturer’s Address:	140 Green Pond Road
	Rockaway, New Jersey 07866
	U.S.A.
declares that the Product
Product Name:	a) AC Power Source/Analyzer
	b) Harmonic/Flicker Test System
Model Number(s):	a) Agilent 6814A, 6814B, 6834A, 6834B
	b) Agilent 6843A
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 Agilent Sales and Service Office or Agilent GmbH,

Department TRE, Herrenberger Strasse 130, D-71034 Boeblingen (FAX:[phone])

5

Acoustic Noise Information

Herstellerbescheinigung

Diese Information steht im Zusammenhang mit den Anforderungen der

Maschinenläminformationsverordnung vom 18 Januar 1991.

*Schalldruckpegel Lp <70 dB(A)

*Am Arbeitsplatz

*Normaler Betrieb

*Nach EN 27779 (Typprüfung).

Manufacturer’s Declaration

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

*Sound Pressure Lp <70 dB(A)

*At Operator Position

*Normal Operation

*According to EN 27779 (Type Test).

Printing History

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

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

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

© Copyright 1996, 1998 Agilent Technologies, Inc.	Edition 1	_________January, 1996
	Edition 2	________December, 1998
	Update	________April, 2000

6

Table of Contents

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

1. GENERAL INFORMATION	9
Document Orientation	9
Safety Considerations	10
Options, Accessories, and User Replaceable Parts	10
Description	10
Capabilities	11
Front Panel/Remote Operation	12
Output Characteristic	12
Ranges	12
Output VA Capability	13

2. INSTALLATION	15
Inspection	15
Damage	15
Packaging Material	15
Items Supplied	15
Cleaning	15
Location	16
Bench Operation	16
Rack Mounting	16
Input Connections	16
Input Source and Line Fuse	17
Installing the Power Cord	17
Output Connections	18
Wire Considerations	19
Voltage Drops	19
Remote Sense Connections	20
OVP Considerations	21
Output Rating	21
Trigger Connections	21
Digital Connections	21
Controller Connections	22
GPIB Connector	22
RS-232 Interface	23

3. TURN-ON CHECKOUT	25
Introduction	25
Preliminary Checkout	25
Using the Keypad	26
Checkout Procedure	26
In Case of Trouble	29
Error Messages	29
Line Fuse	29

7

4. FRONT PANEL OPERATION	31
Introduction	31
Front Panel Description	31
System Keys	33
Function Keys	34
Immediate Action Keys	34
Scrolling Keys	35
Meter Display Keys	35
Output Control Keys	36
Protection and Status Control Keys	38
Trigger and List Control Keys	39
Entry Keys	40
Examples of Front Panel Programming	41
1 - Setting the Output Voltage Amplitude	41
Procedure for Three-Phase AC Sources	42
2 - Setting the Output Frequency	43
3 - Setting a Protection Feature	43
4 - Using Transient Voltage Modes	44
5 - Trigger Delays and Phase Synchronization	47
6 - Using Slew Rates to Generate Waveforms	50
7 - Measuring Peak Inrush Current	52
8 - Setting the GPIB Address and RS-232 Parameters	53
9 - Saving and Recalling Operating States	53
10 - Switching Between Singleand Three-phase Operation (Agilent 6834B only)	54
A. SPECIFICATIONS	55
Specifications	55
Supplemental Characteristics	56
B. VERIFICATION AND CALIBRATION	59
Introduction	59
Equipment Required	59
Test Setup	60
Performing the Verification Tests	60
Turn-On Checkout Procedure	60
Voltage Programming and Measurement Accuracy	61
RMS Current Readback Accuracy	61
Performing the Calibration Procedure	62
Front Panel Calibration Menu	63
Front Panel Calibration	63
Enable Calibration Mode	63
Calibrating and Entering Voltage Calibration Values	64
Calibrating and Entering Current Calibration Values	65
Calibrating the Output Impedance (Agilent 6843A only)	66
Saving the Calibration Constants	66
Changing the Calibration Password	66
Calibration Error Messages	67
Calibration Over the GPIB	67
Agilent Calibration Program Listing	67
C. ERROR MESSAGES	71
Error Number List	71
INDEX	75

8

1

General Information

Document Orientation

This manual describes the operation of the Agilent Technologies 6814B/6834B/6843A AC Power Solutions. These units will be referred to as "ac sources" throughout this manual. Operation of the Agilent 6843A is described for normal mode operation only. 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 GPIB programming information

♦a Quick Reference Card, designed as a memory jogger for the experienced user

♦Regulatory Test Solution User’s Guides are shipped with Agilent 6843A units only

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

Accessories and options Calibrating the ac source Front panel keys

Front panel programming examples Line voltage connections

Line voltage ratings Operator replaceable parts Operator troubleshooting Operating characteristics Performance specifications Quick operating checkout Rack mounting

RS-232 operation

SCPI programming examples SCPI programming commands Turn-on/checkout

Wiring - discrete fault indicator (DFI)

-GPIB controller

-load or loads

-voltage sensing (local and remote)

-remote inhibit (RI)

Location

Chapter 1 - this guide Appendix B - this guide Chapter 4 - this guide Chapter 4 - this guide Chapter 2 - this guide Appendix A - this guide Chapter 1 - this guide Chapter 3 - this guide Appendix A - this guide Appendix A - this guide Chapter 3 - this guide Chapter 2 - this guide Chapter 2 - this guide

Chapter 3 - Programming Guide Chapter 4 - Programming Guide Chapter 3 - this guide

Chapter 2 - this guide Chapter 2 - this guide Chapter 2 - this guide Chapter 2 - this guide Chapter 2 - this guide

9

1 - General Information

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, Accessories, and User Replaceable Parts

		Table 1-1. Options
	Option		Description
	400	Input power 360-440 Vac, three-phase, 47-63 Hz
	1CM	2- Rack mount kit (Agilent 5062-3977)
		Support rails (Agilent 5064-0001) are required (rails are not included in rack mount kit).
		Table 1-2. Accessories
		Item			Agilent Part Number
	Fuse replacement kits
	30AM for 180-235 Vac, 3-phase line				5060-3513
	GPIB cables				10833D
	0.5 meters (1.6 ft)
	1.0	meter (3.3 ft)			10833A
	2.0	meters (6.6 ft)			10833B
	3.0	meters (13.2 ft)			10833C
	Heavy duty slide mount kit				5063-2310
		Table 1-3. User Replaceable Parts List
		Description			Agilent Part No.
	Rack mount kit				See “Options”
	Slide mount kit				See “Accessories”
	7-terminal sense connector plug
				1252-3698
	Sense connector cover
				4040-2268
	4-terminal digital connector plug
				1252-1488
	AC input safety cover (with strain relief and brushing)
				5001-9837
	Screw (4), ac input safety cover (6-32 x 1.5in)
				2360-0405
	Screw (8), ac input barrier block (8-32 x 5/16in)				N/A
	AC output safety cover
				5001-9811
	Screw (2), ac output safety cover (6-32 x .3in)
				2460-0012
	Screw (8), ac output barrier block (10-32 x .37in)				N/A
	Fuse safety cover
				5001-9810
	Screw (2), fuse safety cover (6-32 x .3in)
				2460-0012
	User’s Guide (this manual)
				5962-0887
	Programming Guide
				5962-0889
	Quick Start Guide
				5962-0883
	Quick Reference Card
				5962-0885
	Appropriate Agilent Regulatory Test Solution Software				Agilent 14761A, 14762A, 14763A

10

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	SOURCE	shunt

WAVEFORM	BIPOLAR	MEASUREMENT
GENERATOR	AMPLIFIER	BLOCK

POWERMETER

FFT ANALYZER

Figure 1-1. AC Source Functional Elements

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

Model	Description
Agilent 6814B	3000 VA single –phase operation
Agilent 6834B	1500 VA/ phase for three-phase operation
	(4500 VA for single-phase operation)
Agilent 6843A	4500 VA single-phase operation

Capabilities

♦Programmable ac voltage, dc voltage, frequency, phase, and current limit.

♦Sine, square, clipped sine, and user-definable waveforms.

♦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.

♦Three-phase/single-phase output capability (Agilent 6834B only)

♦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.

11

1 - General Information

∙Additional total power and neutral current measurements in the three-phase model.

∙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 fluorescent display, keypad, and rotary pulse generators for voltage and frequency settings.

♦Built-in GPIB and RS-232 interface programming with SCPI command language.

♦Nonvolatile state and waveform storage and recall.

♦Over-voltage, over-power, over-current, over-temperature, and RI/DFI protection features.

♦Built-in output and sense disconnect relays.

♦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 GPIB 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 GPIB bus or from an RS-232 serial port. GPIB 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

NOTE: Refer to the ac source Programming Guide for further information about remotely programming the ac source. If you are using the Agilent 6843A, refer to the appropriate Regulatory Test Solution User’s Guide for information about regulatory testing.

Output Characteristic

Ranges

The ac source’s output characteristic is shown in the following figure. The output voltage of the ac source may be adjusted to any value within the range of the unit. On three-phase units, each phase can be adjusted independently of the other two.

Rated output VA and conversion efficiency is greatest when the output voltage is set near maximum. For this reason, the ac source is designed to operate on one of two ranges: 150 volts full-scale, or 300 volts full-scale. You should choose the range that allows you to operate nearest the full-scale output capability of the selected range.

12

General Information - 1

	Vrms
	300 V
	150 V
	See Figure 1-3
	0		Irms
		10A (6834B 3phase)
	5A
	15A	30A	(6834B 1phase)
	10A	20A	(6814B)
	16A	32A	(6843A)

Figure 1-2. AC Source Output Characteristic (in real-time mode)

Output VA Capability

The output capability of each output phase is limited by VA (volts-amps) rather than power (watts). The amount of VA available to a load can be determined by examining figure 1-3, the output power curve. This curve rates the available VA versus output voltage. Full VA is available only at a full-scale voltage. Full current is available at voltages between 50% and 100% of the output voltage range. Appendix A documents the ac source’s specifications and supplemental characteristics.

NOTE: The load on the ac source may draw full VA at any power factor between 0 and 1, and may draw maximum current with a crest factor of 4 (3 for Agilent 6843A). If the load draws current in excess of the maximum rated rms or peak current, the voltage amplitude will be clipped to prevent excessive internal power dissipation.

	100
	90
MAXIMUM	80
	70
	60
OF
PERCENT	50
	40
VA,
OUTPUT	30
	20
	10
	0	20	30	40	50	60	70	80	90	100
	10

OUTPUT VOLTAGE, PERCENT OF RANGE

Figure 1-3. AC Source VA Capabilities

13

2

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 Agilent Sales and Support Office immediately. The list of Agilent Sales and Support Offices is at the back of this guide. Warranty information is printed in the front of this guide.

Packaging Material

Until you have checked out the 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	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 Agilent Sales and Support Offices (refer to the list at the back of this guide).
Sense/Digital connector a 4-terminal digital plug that connects to the back of the unit.
	a 7-terminal sense plug that connects to the back of the unit.
Safety covers	Ac input cover with strain relief
	Ac output cover
	Fuse cover
Manuals	User’s Guide
	Programming Guide
	Quick Start Guide
	Quick Reference Card
	Regulatory Test Solutions Guides (supplied with Agilent 6843A units)
Change page	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.

15

2 - Installation

Location

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

WARNING: Agilent 6814B units weigh 79.5 kg (175 lbs.) Agilent 6834B/ 6843A units weigh 87.7 kg (193 lbs.)

Obtain adequate help when moving the unit 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

CAUTION: Agilent 6814B/ 6834B/ 6843A units require instrument support rails for non-stationary installations. These are normally ordered with the cabinet and are not included with the rack mounting kits.

TOP 574.7mm 22.6"

425.5mm

16.75"

REAR

	262.6mm	266.7mm
	10.3"
		10.5"
		19.1mm
	12.7mm	0.8"
	0.5"	SIDE

Figure 2-1. Outline Diagram

16

Installation - 2

Input Connections

Input Source and Line Fuse

The ac source requires a 3-phase power service that provides 7350 VA (6000 W) maximum. The power service should have a current rating greater than or equal to the ac source’s circuit breaker rating. The ac source has a delta input (no neutral connection) and will accept power from either delta (triangle) or wye (star) services.

CAUTION: Two input voltage ranges are available (see "AC Input Ratings" in appendix A). The ac source will be damaged if it is operated at an input voltage that is outside of its configured input range.

In order to maintain phase current balancing, the power service should be a dedicated line with only Agilent 6814B/6834B/6843A ac sources drawing current from it. A disconnect box located near the ac source is recommended for all installations and is mandatory for direct-wired installations.

Installing the Power Cord

WARNING: Installation of the power cord must be done by a qualified and licensed electrician and must be in accordance with local electrical codes.

The power cords supplied with the ac source do not include a power plug. Terminating connectors and a ground lug are attached to one end of the cord. See Figure 2-2 while performing the following procedure.

1.Check the line fuses as follows:

a.Examine the FUSES label on the rear panel.

b.Remove the safety cover in front of the fuse caps.

c.Unscrew the line fuse caps from the rear panel and verify that all fuses are as specified on the label. Reinstall the fuses.

d.Reinstall the safety cover in front of the fuse caps.

2.Remove the ac input cover from the back of the unit.

3.Open the line clamp on the ac input cover and insert the line cord through the opening.

4.Position the power cord so that the clamp is near the end of the outside insulating sheath on the power cord. Tighten the screws to secure the clamp.

5.Secure the three ac lines to the ac power strip as follows:

Phase 1 to L1 (black).

Phase 2 to L2 (red).

Phase 3 to L3 (orange).

6.Secure the ground wire (green) to the chassis earth ground terminal.

7.	Slip the safety cover over the ac input terminal strip and secure the cover with the four
	screws.

8.If required, wire the appropriate power plug to the other end of the power cord. For usermade cables, strip back the sheath 10 cm (4 in).

17

2 - Installation

2

	CAUTION
					7
	WARNING	LINE RATING	WARNING
F 1	F 2	F 3
			L 1	L 2	L 3

3

1

6

4

5

10cm (4 in.)

Figure 2-2. Connecting the Power Cord

Output Connections

The power output terminal block has a termination for each of the output phases (φ1, φ2, φ3 ) and a floating neutral line (COM) for the phase return connections. A separate earth ground terminal ( ) is located near the output terminals.

Figure 2-3. Output Connections

18

Installation - 2

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

Wire Considerations

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.	Ampacity1	Resistance2	AWG No.	Ampacity1	Resistance2
		(Ω/m)			(Ω/m)
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

		NOTES:
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)	Constant		Temp. (°C)		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.

Voltage Drops

The load wires must also be large enough to avoid excessive voltage drops due to the impedance of the wires. In general, if the wires are heavy enough to carry the maximum short circuit current without overheating, excessive voltage drops will not be a problem. The voltage drops across the load wires should be limited to less than 2% of the output voltage.

Refer to Table 2-1 if you need to calculate the voltage drop for some commonly used AWG copper wire.

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2 - Installation

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:

♦Connect the phase 1 (φ1) through phase 2 (φ) 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 opencircuited. If the sense leads are left unconnected or become open during operation, the ac source will regulate at the output terminals, resulting in a 3% to 5% increase in output over the programmed value.

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.

COM φ 3 φ 2 φ 1

NOTE: Phase 2 and phase 3 connections are not available on 6814B/6843A units. Connector and connections are rotated 180 degrees for 6843A.

φ 1 LOAD

φ 1

φ 2

φ 2 LOAD

φ 3

COM

φ 3 LOAD

Figure 2-4. Remote Sense Connections

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Installation - 2

OVP Considerations

The overvoltage protection circuit senses voltage near the output terminals, not at the load. Therefore the signal sensed by the OVP circuit can be significantly higher than the actual voltage at the load. When using remote sensing, you must program the OVP trip voltage high enough to compensate for the voltage drop between the output terminals and the load.

Output Rating

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 will not damage the unit, but may trip the OV protection circuit, which senses the voltage at the output terminals.

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 re-enable 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 GPIB /RS-232.

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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.

NOTE: Diagram is correct for 6814B/6834B. Connector and connections are rotated 180 degrees for 6843A

FLT INH

+ - + -

+ -	+	-	. . . .

FLT Output

FLT INH

+ - + -

+ - + -

. . . .

INH Input

INH Common

Switch (Normally Open)

A) INH Example with One Unit

INH Input

+ - + -

INH Input

FLT Output

B) FLT Example with Multiple Units

Figure 2-5. FLT/INH Examples

Controller Connections

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

GPIB Connector

Each ac source has its own GPIB 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 GPIB interface.

NOTE: The ac source is shipped from the factory with its GPIB address set to 5. This address can be changed as described in Chapter 4 of this guide.

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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 GPIB 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 Agilent 24542G or 24542H interface cable.

Table 2-2. RS-232 Connector

	1	2	3 4 5		Pin	Input/Output	Description
					1	Output	Reserved for service use
					2	Input	Receive Data (RxD)
					3	Output	Transmit Data (TxD)
					4	Output	Data Terminal Ready (DTR)
					5	Common	Signal ground
		6 7		8 9	6	Input	Data Set Ready (DSR)
					7		no connection
					8		no connection
					9	Output	Reserved for service use

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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 GPIB 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	ac source
TxD (3)	TxD (3)
RxD (2)	RxD (2)
*DTR (4)	DTR (4)
*DSR (6)	DSR (6)
Ground (5)	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 GPIB response data which is terminated by the single character <newline>.

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