Agilent 6812B Users Guide and Programming Guide

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ADDENDUM

to the

Agilent 6812B and 6813B

User's Guide and Programming Guide

for the

Auxiliary Output Option 026

Agilent P/N 5964-8237 Printed in U.S.A. Microfiche No 5964-8238 November, 2000

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Contents

Contents 2 Auxiliary Output Capability 3 Rear Panel Connections 4 Installation 4 Front Panel Programming 4 Additional [Source] Commands 5 Additional Calibration Commands 5 Behavior Differences of Existing SCPI Commands 6 Auxiliary Ouput Specifications 7 Calibration for Option 026 7

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.

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Auxiliary Output Capability

The Agilent Technologies Auxiliary Output Option 026 is available on the following ac sources: Agilent 6812B AC Power Source (750VA)

Agilent 6813B AC Power Source (1750VA)

Option 026 consists of an auxiliary 26 Vrms output located on the rear panel of the ac source. This is a programmable output with a maximum output current of 100mA rms. The output frequency tracks the frequency of the main output of the ac source. Option 026 adds the following capabilities to the above listed ac source models:

• AC voltage and phase are programmable, in immediate mode only.

• Software calibration is available for both voltage and phase. Calibration is performed at a single

frequency (400 Hz). Note that there is no compensation for frequency-dependent voltage variation or phase shift.

• The auxiliary output waveform and frequency are always the same as the main output.

• For a sine wave output, the maximum programmed rms voltage value is 26.02 V. For any waveform,

the programmed rms voltage value may not result in a peak voltage of more than 36.8 V.

• Current limit is not programmable.

• DC voltage is not available.

Front Panel Menus - Additions

The following menu commands have been added to let you program the Auxilliary Output. In most cases you will need to press the Function key multiple times to access the menu item. Press the

RRRR

Entry key to access the parameter.

Voltage Shift

RRRR

RPhase

VOLT:AUX <value> PHASE:AUX <value>

Set auxiliary output voltage Set auxiliary output phase

SCPI Programming Commands - Additions

The following SCPI commands have been added to let you access the auxiliary output.

CALibrate [SOURce]

:VOLTage :VOLTage

:AUXiliary[:AC] :AUXiliary <NRf+>

:PHAse :PHASe

:AUXiliary :AUXiliary <NRf+>

:DATA?

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Rear Panel Connections

Auxiliary Output. Connector is removable.

L 2( N )

HP-IB

++-

. . . .

HI LO

. . . .

TRIGGER

SENSE

Rear Panel, Overall View

Installation

Turn the unit off before connecting any wires.

The Auxiliary Output has a HI and a LO connection. Two pins are designated HI and the other two pins are designated LO. The maximum isolation voltage to ground is 300 Vac (±425 Vdc).

IMPORTANT: You should always use both pins of the HI and the LO outputs. This promotes current

sharing among the output pins.

Front Panel Programming

Setting the Auxiliary Output

To set the auxiliary output voltage and phase:

Action Display

To set the auxiliary output voltage, press Voltage. Then scroll to the VOLT:AUX command. Use the numeric keypad to enter a voltage and press Enter.

To set the auxiliary output phase, press Shift and Phase. Then scroll to the PHASE:AUX command. Use the numeric keypad to enter a phase and press Enter.

To enable the auxiliary output, press Output On.

VOLT:AUX 10

PHASE: AUX 25

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Additional [Source] Commands

The following additional source commands are provided with the Auxiliary Output Option 026.

VOLTage:AUXiliary

This command programs the ac rms output voltage level of the auxiliary output. The auxiliary output waveform and frequency are always the same as the main output. The auxiliary output is enabled along with the main output.

The maximum peak voltage of the auxiliary output is 36.8 V peak. This includes any combination of voltage and function shape values. Therefore, the maximum value that can be programmed depends on the peak-to-rms ratio of the selected waveform. For a sinewave, the maximum voltage that can be programmed is 26.02 V rms.

Command Syntax

Parameters

Unit

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

[SOURce:]VOLTage:AUXiliary[:LEVel][:IMMediate][:AMPLitude] <NRf+> For sinewaves: 0 to 26.02 | MAXimum | MINimum V (rms voltage) 1

VOLT:AUX 12 VOLT:AUX:LEV 15

[SOURce:]VOLTage:AUXiliary[:LEVel][:IMMediate][:AMPLitude]? <NR3> PHASe:AUXiliary

PHASe:AUXiliary

This command sets the phase of the auxiliary output voltage waveform relative to an internal reference. The phase angle is programmed in degrees. Positive phase angles are used to program the leading phase, and negative phase angles are used to program the lagging phase.

Command Syntax

Parameters

*RST Value

Examples

Query Syntax

Returned Parameters

Related Commands

[SOURce:]PHASe:AUXiliary[:ADJust|:IMMediate] <NRf+> –360 through +360 (degrees) | MAXimum | MINimum 0 (degrees)

PHAS:AUX 90 PHAS:AUX MAX

[SOURce:]PHASe:AUXiliary[:ADJust|:IMMediate]? <NR3> VOLTage:AUXiliary

Additional Calibration Commands

The following SCPI commands are used to calibrate the Auxiliary Output Option 026:

CALibrate:VOLTage:AUXiliary

Initiates calibration of the auxiliary output voltage.

Command Syntax

Parameters

Examples

CALibrate:VOLTage:AUXiliary[:AC] None

CAL:VOLT:AUX

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CALibrate:PHASe:AUXiliary

Initiates calibration of the auxiliary output phase.

Command Syntax

Parameters

Examples

CALibrate:PHASe:AUXiliary None

CAL:PHAS:AUX

CALibrate:DATA?

Lets you read the present value of the phase calibration. This command can only be used during the auxiliary phase calibration procedure. It will return an error if it is used at any other time.

Query Syntax

Parameters

Examples

CALibrate:DATA? <NR3>

CAL:DATA?

Behavior Differences of Existing SCPI Commands

This section documents the behavior differences of existing SCPI commands with the Auxiliary Output Option 026.

OUTput:STATe

This command control the on/off state of both the main and auxiliary outputs.

*SAV and *RCL

These commands include the auxiliary output voltage and phase.

*RST

Sets the auxiliary output voltage and phase to zero.

*OPT?

Returns 26.

*IDN?

Except for the firmware revision number, *IDN? returns the same response as the standard 6812B/6813B.

In addition to the new calibration commands shown above, auxiliary voltage and phase calibration utilize the standard commands CALibrate:LEVel and CALibrate:DATA.

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Auxiliary Ouput Specifications

Table A-1 lists the specifications of the Agilent Auxiliary Output Option 026. 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 a frequency range of 400Hz.

Table A-1. Option 026 Performance Specifications

Parameter Value

Maximu m Output Ratings rms Voltage:

rms Current:

Frequency:

0-26 V

100 mA

400 Hz

Output Ripple and Noise voltage p-p:

Programming Accuracy

The frequency of the auxiliary output tracks the main output.

300 mV

+/- 1 %

Table A-2. Option 026 Supplemental Characteristics

Parameter Value

Short Circuit Current

(sustainable indefinitely)

Phase offset relative to main output:

phase control range:

Programming Resolution Output Voltage:

Output Phase:

>100 mA rms

</= 1 degree

+/- 360 degree

10 mV

0.1 degree

Calibration for Option 026

This section includes calibration procedures for the Auxiliary Output Option 026. Add these procedures to those described in Appendix B of the AC Source User's Guide.

Because the output of the ac source must be enabled during calibration, proceed with caution, since voltages and currents will be active at both the auxiliary and the main 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 re-calibrated.

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.

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Equipment Required

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

Table B-1. Equipment Required

Equipment Characteristics Recommended Model

4-pin connector plug

Digital Voltmeter

Universal Counter 10:1 probes (2) GPIB Controller

This connector is supplied with the ac source when ordered with Option 026.

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

Full GPIB capabilities HP Series 200/300 or equivalent

Summary of 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.

SHUNT <value> Enter a value for the external current shunt in ohms. CAL:VOLT:OFFSET Begin voltage offset calibration CAL:VOLT:DC Begin dc volt age calibrati on sequence CAL:VOLT:AC Begin ac voltage calibrati on sequence CAL:VOLT:AUX Begin auxiliary voltage calibration CAL:VOLT:PROT Begin voltage protection calibration CAL:VOLT:EXT Begin external voltage calibration sequence CAL:CURR:AC Begin ac current calibration sequence CAL:CURR:MEAS Begin current measurement calibration sequence CAL:CURR:EXT Begin external current calibration sequence CAL:IMP Begin output impedance calibration sequence CAL:PHAS:AUX Begin auxiliary phase calibration CAL:SAVE Saves the calibration constants in non-volatile memory. CAL:PASS <value> Set new calibration password.

1252-1488

Agilent 3458A

Agilent 53132A or equivalent

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Enable Calibration Mode

Action Display

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

Press Shift Calibration, enter the calibration password from Entry keypad, and press Enter. If the password is correct, the Cal annunciator will come on. (If no password has been set, just press Enter.)

If 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.)

If CAL DENIED appears, then an internal switch has been set to prevent the calibration from being changed (see the Service Manual.)

Calibrating the Auxiliary Ouptut Voltage

Action Display

3. Disconnect all loads from the ac source. Connect the DVM across the output terminals of the auxiliary output using the 4-pin connector provided. Make sure the DVM is operating in AC volts mode.

Press Shift Calibration, scroll to CAL VOLT AUX, and press Enter.

Press Shift Calibration, scroll to CAL LEV P1 and press Enter.

Press Shift Calibration, scroll to CAL DATA, and use the Entry keypad to enter the ac voltage value displayed on the DVM. Then press Enter

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

*RST

CAL ON 0.0

OUT OF RANGE

CAL DENIED

CAL:VOLT:AUX

CAL:LEV P1

CAL:DATA 0.00

CAL:SAVE

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

Calibrating the Auxiliary Output Phase

Action Display

Disconnect all loads from the ac source. Reset the ac source by selecting Shift, Output, scrolling to *RST, and pressing Enter. Make sure that the Dis annunciator on the front panel is on.

2. Use a clip lead and connect the LO terminal of the Auxiliary output to the ACC teminal of the Main output.

3. Program the Main output of the ac source to 26Vrms @ 400 Hz. Program the Auxiliary output of the ac source to 26Vrms. Press Output On to enable the outputs.

4. Set the 53132A controls as follows:

Other Meas – Phase 1 to 2 Channel 1 & 2 Impedance: 1 Megohm Channel 1 & 2 Coup l ing: AC Channel 1 & 2 Attenuator:10X

5. Connect input 2 of the 53132A to the Auxiliary output with a 10:1 probe, positive lead to Hi out and negative lead to Low out (common to main output low).

6. Connect input 1 of the 53132A to the Main output with a 10:1 probe, positive lead to AC out and negative lead to ACC out (common to auxiliary output low).

CAL OFF

*RST

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Note: The 10:1 probes must be properly compensated for the 1 Megohm inputs to

ensure that probes do not contribute a phase offset error. Compensation may be easily done by connecting both probes to the same AC source output and adjusting the compensation for one probe to produce a reading of 0.0 degrees on the 53132A counter.

7. Enable calibration mode as previously described.

Press Shift Calibration, scroll to CAL PHAS AUX, and press Enter.

Press Shift Calibration, scroll to CAL LEV P1 and press Enter.

10. Using the universal counter (or e quivalent instrument), monitor the phase of the auxiliary output with respect to the main output.

11.

Press Shift Calibration, scroll to CAL DATA, but do NOT press the Enter key.

12. Using the ENTR Y arrow keys (é and ê ), adjust the calibration parameter until the measured phase difference is zero or as close to zero as possible. The actual phase at the instrument output changes immediately in response to the arrow keys. (This is the only time that the arrow keys operate in this “live” mode).

13.

When the measured phase difference has been adjusted to zero, press Enter.

14.

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

15.

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:PHAS:AUX

CAL:LEV P1

CAL:DATA 0.00

CAL:SAVE

CAL OFF