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4

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.

φ

1

115V 60 Hz

φ

2

120V 60 Hz

Displays the Main Output measurement when

φ

1 is selected

Displays the Power Analyzer measurement when

φ

2 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

φ

2 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

ô

ô

ô

ô

ô

ô
ô

Cal

Freq

Input

Shift

ô

°

«
...
2
3
4
5
6
...
»

Содержание 6811B

Страница 1: ... to the HP Model 6811B 6812B 6813B User s Guide and HP Model 6811B 6812B 6813B Programming Guide HP Dual Power Analyzer Option 020 or 022 HP Part No 5964 8134 Printed in U S A Microfiche No 5964 8135 June 1999 ...

Страница 2: ...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 Hewl...

Страница 3: ... 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 HP Dual Power Analyzer also includes an HP supplied current shu...

Страница 4: ...tion 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 measure...

Страница 5: ...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 ava...

Страница 6: ...oint 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 b...

Страница 7: ...e 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 ...

Страница 8: ...he 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...

Страница 9: ...dicates 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 q repeatedly to access the following measurement functions rms voltage and frequency t...

Страница 10: ...OLt 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 leve...

Страница 11: ...3 Related Commands MEAS TVOL MEASure VOLTage RANKed FETCh VOLTage RANKed Scans through the buffer of 4096 instantaneous voltage measurements and returns the voltage value that corresponds to the percentile rank given Specifying a percentile of 0 returns the lowest value in the buffer A percentile of 100 returns the highest value in the buffer A percentile of 50 returns the median value of the buff...

Страница 12: ...RANGe range Command Syntax SENSe NSELect NR1 Parameters 1 2 RST Value 1 Examples SENS NSEL 2 Query Syntax SENSe NSELect Returned Parameters NR1 SENSe FREQuency SOURce This command selects the frequency measurement source for the Power Analyzer input It only applies when the Power Analyzer input is active Accurate frequency measurements are critical when making all Harmonic measurement calculations...

Страница 13: ...tion Sets the peak frequency deviation of the output frequency modulation in Hertz The frequency deviation must be less than the programmed output frequency by at least 0 001 Hz For example if the output frequency is set to 60 Hz and you program a deviation of 10 Hz the output frequency will modulate between 50 and 70 Hz at a rate determined by the FM FREQuency command Command Syntax SOURce FM DEV...

Страница 14: ...ternal current measurement Command Syntax CALibrate CURRent EXTernal Parameters None Examples CAL CURR EXT CALibrate SHUNt Lets you enter the external current shunt value in ohms The external current shunt is used for external current measurement The programming range is 1E 6 to 1E6 This parameter is nonvolatile so there is no RST value As with other CAL commands calibration must first be enabled ...

Страница 15: ...ement range of the selected measurement source see SENSe NSELect Normally when using the Main Output as the measurement source you would put in a value and the ac source will automatically select the current range If you are using the Power Analyzer input with an external current shunt as the measurement source the crossover value of the current ranges can be determined with the following formula ...

Страница 16: ...URNS AC SOURCE OUTPUT ON AT 120 VAC 160 WAIT 2 MAKE SURE UPS OUTPUT HAS TIME TO SETTLE 170 180 190 OUTPUT Ps VOLT MODE PULS SET UP PULSE MODE FOR AC SOURCE OUTPUT 200 OUTPUT Ps PULS WIDT 0 05 SET PULSE WIDTH TO 50 MILLISECONDS 210 OUTPUT Ps VOLT TRIG 0 SET PULSED TRIGGERED VALUE TO 0 VOLTS 220 230 240 OUTPUT Ps TRIG SYNC SOUR PHAS SETS DROPOUT SYNCHRONIZATION TO PHASE 250 OUTPUT Ps TRIG SYNC PHAS ...

Страница 17: ...urce GUI The HP AC Source Graphical User Interface software recognizes if your ac source includes option 020 or 022 and automatically activates the controls for these options when the software is installed Making a Measurement First you must select the type of waveform to display and then make the measurement ñ Click on the Config button and then selecting the Config Waveform Display tab ñ Select ...

Страница 18: ...fference between the output of the ac source and the output of a UPS after ac power is restored following an ac line dropout This measurement requires that the output of the UPS be connected to the Power Analyzer input Also you must have already measured and displayed both the ac source output and the UPS output waveforms in the Main window To access the Voltage Phase Difference measurement go to ...

Страница 19: ...he screen enter values for the indicated parameters The test uses these parameters to run the test For a detailed explanation of the Transfer Time test parameters refer to the online help by pressing the F1 key When you are ready to run the test press Run Test Modulating the Output Frequency AC sources equipped with option 020 or 022 have the capability to modulate the output frequency To access t...

Страница 20: ...0 500 Hz 500 Hz 1 kHz 0 05 1 5 mA 0 05 8 mA 0 05 25 mA repetitive pk current High Range 45 Hz 1 kHz 0 05 150 mA repetitive pk current Low Range 45 Hz 1 kHz 0 03 150 mA Power VA Low Range 45 100 Hz 100 500 Hz 500 Hz 1 kHz 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 Power VA High Range 45 100 Hz 100 500 Hz 500 Hz 1 kHz 0 1 1 5 VA 12 mVA V 0 1 2 VA 12 mVA V 0 1 6 VA 12 mVA V Power Watt...

Страница 21: ...urrent 10 mV 2 mA THD for a fundamental amplitude 5 of full scale 5 of reading 0 1 Measurement System Measurement Source Synchronization 100 ns Measurement Buffer Length 4096 points Measurement Generation Synchronization 50 µs Measurement Acquisition Sampling Rate Range 25 250 µs Voltage Current Digitization Accuracy 12 bits Voltage Current Digitization Resolution 16 bts Harmonic Measurement Time ...

Страница 22: ...ATH 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 Table B 1 Equipment Requi...

Страница 23: ...The ac source must pass turn on selftest before you can proceed with the verification Test Set up COM R Rs L Rs Current Monitor resistor 0 01 ohms HP3458A DMM COM 01 SENSE R Load resistor for CC test 30 ohms 01 HP3458A DMM HP 6811B 6812B 6813B MAIN OUTPUT POWER ANALYZER LO HI LO HI I SENSE V SENSE HP33120A FUNCTION GENERATOR COM COM 01 SENSE 01 HP 6811B 6812B 6813B MAIN OUTPUT POWER ANALYZER LO HI...

Страница 24: ...ithin 190 mV of DVM reading Power Analyzer Current Measurement Accuracy This test verifies the accuracy of the Power Analyzer current measurements The Phase 2 annunciator on the left side of the display must be on for the front panel to display Power Analyzer input measurements Figure B 1A shows the setup Use the HP supplied current shunt It has the accuracy specified in table B 1 Use wire of suff...

Страница 25: ...CAL VOLT DC Begin dc voltage calibration sequence CAL VOLT AC Begin ac voltage calibration sequence 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 imp...

Страница 26: ...e terminals I SENSE to ensure no dc offset error 12 Press Shift Calibration scroll to CAL CURR EXT and press Enter CAL CURR EXT 13 Leave the ac source on and remove the short from the Power Analyzer current terminals 14 Connect the Power Analyzer current terminals to the output of the function generator see figure 3 1B Set the function generator output to 50 mV 60 Hz 15 Connect the Power Analyzer ...

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