Agilent Technologies 6813B User manual

ADDENDUM

to the

Agilent 6811B, 6812B, and 6813B

User’s Guide and Programming Guide

for the

Dual Power Analyzer Option 020/022

Agilent P/N 5964-8134 Printed in U.S.A.

Microfiche No 5964-8135 May, 2000

Contents

Agilent Dual Power Analyzer Description 3

Rear Panel Connections 5

Installation 5

Front Panel Programming 8

Additional Measurement Commands 10

Additional Sense Commands 12

Additional Frequency Modulation Commands 13

Additional Calibration Commands 14

Behavior Differences of Existing SCPI Commands 15

Programming Example 16

Using the Power Analyzer Input with the GUI 17

Power Analyzer Input Specifications 20

Verification and Calibration for Option 020/022 22

Verification Procedure 23

Calibration Procedure 25

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.

Agilent Dual Power Analyzer Description

The Agilent Technologies Dual Power Analyzer Option 020 is available on the following ac sources:

Agilent 6811B AC Power Source (375VA)

Agilent 6812B AC Power Source (750VA)

Agilent 6813B AC Power Source (1750VA)

Agilent 6813B Option 019 AC Power Source (2000VA)

Option 020 consists of an additional Power Analyzer input on the back of the ac source, an external

current shunt, and a cable to connect the current shunt to the ac source. Option 020 adds the following

capabilities to the above listed ac source models:

•Voltage and current measurement inputs on the rear panel, with capabilities similar to the output

voltage and current measurements available in standard Agilent ac sources.

•The ability to use any shunt for the external current measurement, allowing current measurements

over a very wide range of magnitudes.

•Precisely synchronized measurements between the rear panel Power Analyzer input and the ac source

output. This is possible because the Power Analyzer input has its own dedicated measurement buffer.

•New measurement commands that may be used in evaluating uninterruptible power supplies (To

measure transfer time, peak voltage, and phase locked loop performance for example).

•Frequency modulation of the ac source output.

As shown in the following figure, the Agilent Dual Power Analyzer also includes an Agilent supplied

current shunt, which must be connected to the output of the equipment under test to make accurate

voltage and current measurements. The specifications and supplemental characteristics of the Agilent

Dual Power Analyzer are documented toward the end of this document.

Option 020 Typical Connections

Agilent Option 022 Description

Option 022 is simply an Agilent 6813B Option 019 AC Power Source combined with an Agilent Dual

Power Analyzer Option 020. All of the Option 020 information in this document also applies to units that

are configured as Option 022 units.

Agilent AC SOURCE

(side view)

Shunt

Equipment

Under Test

Agilent supplied cable

Power

Analyzer Input

(V & I sense) Agilent supplied shunt

ac line cables

(customer supplied)

AC Source output

outputac in

Load

Line Load

Front Panel Menus - Additions

The Power Analyzer input uses the same front panel menu commands that are used to measure the Main

Output of the ac source. These are documented in the ac source User’s Guide. The following menu

commands have been added to let you access the Power Analyzer input, control the output frequency

modulation, and calibrate the Power Analyzer input. In most cases you will need to press the

Function key multiple times to access the menu item. Press the Entry key to access the parameter.

φ1 115V 60 Hz

φ2 120V 60 Hz Displays the Main Output measurement when φ1 is selected

Displays the Power Analyzer measurement when φ2 is selected

FM OFF Enable or disable output frequency modulation (OFF or ON)

FM:FREQ 50 Specifies the modulating frequency of the output

FM:DEV 10 Specifies the peak deviation of the output frequency modulation

FREQ:SRC VOLT Specifies the frequency input source (VOLT or CURR)

CAL:CURR: EXT Begin external current calibration

CAL:VOLT: EXT Begin external voltage calibration

SHUNT Enter a value for the external shunt in ohms

NOTE: With no signal connected to the Power Analyzer input, the φ2 front panel display may

return a very high frequency value. This is normal, since there is no external frequency

for the measurement circuit to detect.

SCPI Programming Commands - Additions

The Power Analyzer input uses the same measurement commands that are used to measure the Main

Output of the ac source. These are documented in the ac source User’s Guide. The following SCPI

commands have been added to let you access the Power Analyzer input, control the output frequency

modulation, and calibrate the Power Analyzer input. Additional measurement functions let you measure

transfer time, peak voltage, and phase locked loop performance when evaluating devices such as

uninterruptible power supplies.

CALibrate MEASure | FETCh

:CURRent :VOLTage

:EXTernal :RANKed? <percentile>

:VOLTage :TVOLt? <level><occurrence>

:EXTernal :ABSolute? <level><start_time><min_pulse_width>

:SHUNt

FM SENSe

:STATe <bool> :NSELect 1 | 2

:DEViation <value> :FREQuency:SOURce VOLT | CURR

:FREQuency <value>

Phase

Select

Cal

Freq

Input

Shift

Rear Panel Connections

Power Analyzer input.

Connector plug is

removable.

LINERATING

HP-IB

FLTINH

COM

SENSE

WARNING

300 VACMAXTO

RS232

L 2( N )

OPTIONS

CAUTION

WARNING

TRIGGER

OUT1

IN1

. . . . .

. . . .

LO HI LO HI V

SENSE

Rear Panel, Overall View

Installation

Turn the unit off before connecting any wires.

The Power Analyzer input to the ac source has both voltage and current sense inputs. Each sense input

has a HI and a LO connection. The center pin of the connector is not used. The maximum isolation

voltage to ground is 300 Vac (±425 Vdc).

Use the 1-meter, Agilent supplied cable and connect the Power Analyzer input to the external shunt. Note

that the cable connectors are keyed so that the cable will only fit one way. Disconnect the cable from the

unit by pulling it straight back. Cable connections are shown in the following figure.

IMPORTANT: You should always connect the V SENSE inputs for the Power Analyzer input to operate

properly, even if you are not making voltage measurements. This is because frequency

measurements are made by sensing the voltage signal, and many of the power analyzer

measurements depend on an accurate frequency measurement. If a voltage signal is not

available, use SENSe:FREQuency:SOURce (or its front panel equivalent) to select and

measure the frequency from the current signal instead.

If the Agilent supplied cable is too short, you may open the cable ends and replace the wiring in the cable

with longer wires. Install the new cable in the same way as the original cable. The cable connectors

accepts wire sizes from AWG 22 to AWG 12. Firmly tighten the screws when making wire connections.

WARNING: SAFETY HAZARD You must replace the cable hoods after completing all connections.

This is because the connector screw terminals will be at line potential during operation.

Measurement Cable Connections

Voltage Sensing at a Location Other than the External Current Shunt

You may also need to open up the cable connector if you need to voltage sense at a point other than at the

external current shunt. You must use your own sense cable to make the voltage sense connections. Please

completely remove the voltage sense wires from the Agilent supplied measurement cable if you are using

your own remote voltage sense cable. Disconnect the voltage sense wires from both cable connectors.

To use your own cable to voltage sense at a point other than the external current shunt, make the

connections at the point where you will be remote sensing. Insert the other end of your cable into the HI

and LO voltage sense terminals of the ac source connector. The cable connectors accepts wire sizes from

AWG 22 to AWG 12. Firmly tighten the screws when making wire connections.

WARNING: SAFETY HAZARD You must replace the cable hoods after completing all connections.

This is because the connector screw terminals will be at line potential during operation.

V SENSE I SENSE

HI LO HI LO

LO HI LO HI

I V

SENSE SENSE

HOODS PLACED

OVER WIRES AND

CONNECTORS

CONNECTOR

(AC SOURCE END)

CONNECTOR

(SHUNT END)

CONNECTOR

HALVES SNAP

TOGETHER

RELEASE TAB

WARNING, SAFETY HAZARD:

Connector hoods must be installed

on connectors. Connector screw

terminals are at line potential

during operation.

WIRES MUST BE INSTALLED IN

STRAIN RELIEF INSIDE CONNECTOR

External Shunt Line and Load Connections

The Agilent supplied current shunt has both input (line) and output (load) connectors. The customer must

supply the cables to connect the ac lines to and from the external current shunt. Agilent supplies one

hooded cable cover for the input of the ac source and two hooded cable covers for the shunt. All three of

these covers are assembled and installed in the same way. It is the customer’s responsibility to use these

covers when making line cable connections. Note that a different cable cover is provided for the ac

output of the ac source.

The following figure shows the Load and Line connectors on the external current shunt. Note the

location of the line, neutral and ground connectors and connect your cables accordingly. Note that the

connections on the output of the ac source are not in the same order on the barrier block as on the shunt

barrier block.

WARNING: SAFETY HAZARD You must replace the cable hoods after completing all connections.

This is because the screw terminals will be at line potential during operation.

Line Connections

3. GROUND CONNECTION (GRN/YEL OR GRN)

2. LINE CONNECTION (BROWN OR BLACK)

1. NEUTRAL CONNECTION (BLUE OR WHITE)

4. POWER CORD

5. CONNECTOR NUT

6. RUBBER BOOT

7. POWER SAFETY COVER

8. STRAIN RELIEF CONNECTOR

Check the External Current Shunt Setting

After you have completed your cable connections, you can turn on and check out the ac source as

described in the Turn-On Checkout chapter in the ac source User’s Guide. One additional step in

checking out a unit with Option 020/022 installed, is to make sure that the correct shunt value has been

entered in the unit. To check the shunt value setting, proceed as follows:

Action Display

1. Turn on the ac source and wait for the unit to finish its internal selftest.

2. Press Shift Calibration and scroll to the SHUNT command. SHUNT 0.01

3. Check to see if the resistance value on the display matches the value written on the

outside of the external current shunt.

If it matches, press Meter to return to meter mode. You are done.

If it does not match, you must enter the correct value. Proceed as follows:

4. Press Shift Calibration, scroll to CAL ON and press Enter. If necessary, enter

the calibration password from Entry keypad and press Enter. If the password is

correct the Cal annunciator will come on.

CAL ON 0.0

5. Press Shift Calibration and scroll to the SHUNT command. Enter the shunt

value written on the outside of the external current shunt exactly as it is written on

the label. Then press Enter.

SHUNT 0.01

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

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

NOTE: The shunt value that you enter applies only to the Power Analyzer input and has no

effect on ac source output measurements. Therefore, ignore the φ1 and φ2 annunciators

while entering the shunt value.

Front Panel Programming

Setting the Output Frequency Modulation

To set the output frequency modulation:

Action Display

1. On the Function keypad, press Frequency. Then scroll to the FM:FREQ command

to enter a modulating frequency. Use the numeric keypad to enter a modulating value

and press Enter.

FM:FREQ 1

2. To set the peak frequency deviation of the output frequency modulation, press

Frequency. Then scroll to the FM:DEV command to enter a frequency deviation.

Use the numeric keypad to enter a value and press Enter.

The deviation frequency must be less than the programmed output frequency by at

least 0.001 Hz.Otherwise, it will result in Error 613.

FM:DEV 10

3. To enable frequency modulation, press Frequency, scroll to FM OFF, select the

ON parameter and press Enter.FM ON

Using the Front Panel Display with the Power Analyzer Input

To select the measurement source:

Action Display

Press Meter to return the display to Meter mode. Press Phase Select at any time to

toggle between the Main Output and the Power Analyzer input. The left-most digit of

the front panel display will indicate either "φ1" for the Main Output, or "φ2" for the

Power Analyzer input. If the φ2 front panel display returns a very high frequency

value, it usually means that there is no signal connected to the Power Analyzer input.

Note that the Phase Select key also selects the measurement source to which the

current range setting applies. The current range command is located in the Input menu.

φ2 115V 60Hz

Making Power Analyzer Input Measurements

All measurements are based on acquiring and subsequently processing waveform information. Waveform

information is acquired either from the ac source output or from the Power Analyzer input. When the ac

source is on, it continually takes measurements and updates the front panel meter from whichever

measurement source is active. The Meter key accesses the measurement functions from the front panel.

This menu applies to both the ac source output and the Power Analyzer input.

NOTE: The Shift Harmonic functions also apply to the Power Analyzer input.

If the display indicates OVLD, the measurement capability of the unit has been

exceeded.

Use the Meter menu for making Power Analyzer input measurements:

Action Display

1. Press Phase Select to toggle to the Power Analyzer input. A φ2 will appear

on the display when the Power Analyzer input is selected.

φ2 115V 3.04A

2. Press Meter and qrepeatedly to access the following measurement functions:

♦rms voltage and frequency (the default) φ2 <reading>V <reading>Hz

♦rms voltage and rms current φ2 <reading>V <reading>A

♦rms current and frequency (the default) φ2 <reading>A <reading>Hz

♦rms voltage and power φ2 <reading>V <reading>W

♦current crest factor φ2 <reading> CREST F

♦peak current, repetitive φ2 <reading>A PK REP

♦peak current, non-repetitive φ2 <reading>A PK NR

♦apparent power φ2 <reading> VA

♦reactive power φ2 <reading> VAR

♦power factor φ2 <reading> PFACTOR

The ac source uses the output frequency value when calculating many of the output measurements. For ac

source output measurements, the ac source uses the programmed output frequency value. For the Power

Analyzer input , the ac source uses the frequency measured at the V SENSE input channel. This is the

default setting. You can also select the I SENSE input channel as the frequency measurement source.

Use the Input menu for selecting the frequency source:

Action Display

If a voltage signal is not available to measure the output frequency, you must

select the current measurement as the frequency source. Press Input, scroll to

FREQ:SRC VOLT, select the CURR parameter and press Enter.

FREQ:SRC CURR

Additional Measurement Commands

The following additional measurement commands are provided with the Agilent Dual Power Analyzer

Option 020/022. These measurement commands are optimized for use in specific applications such as

evaluating uninterruptible power supplies. In this application the new commands can be used to measure

transfer time, peak voltage, and phase locked loop performance of the UPS.

NOTE: All MEASure and FETCh commands apply to both the Main Output and the Power

Analyzer input. This includes commands documented in the ac source User’s Guide and

those described in this section. See SENS:NSEL to select a power analyzer input.

MEASure:TVOLt?

FETCh:TVOLt?

Returns the time at which the measured voltage crosses a user-specified voltage level. The sign and

magnitude of occurrence define the event to be reported. For example, if occurrence is -3, the return

value is the third time at which the voltage crosses the level in the negative-going direction. If occurrence

is 4, the return value is the fourth time at which the voltage crosses the level in the positive-going

direction.

The return value is with respect to the start of the measurement buffer. If no point on the waveform

satisfies the specified conditions, the return value is 9.91000E+37.

Query Syntax MEASure:[SCALar]:TVOLt? <level>, <occurrence>

FETCh:[SCALar]:TVOLt? <level>, <occurrence>

Parameters −1E6 to 1E6 (for level)

−4096 to +4096, but not 0 (for occurrence)

Examples MEAS:TVOL? 50, 3 FETC:TVOL? 10, -1

Returned Parameters <NR3>

Related Commands MEAS:TVOL:ABS?

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