Measurement operation

The PCR-M panel display operates as a monitor. It displays the present value that is being delivered to the load.

If you are using the PCR-M series with firmware version 1.19 or earlier, see here.

 

If the measurement is not complete immediately after sending the INIT:SEQ3/INIT:NAME ACQ command or immediately after a MEAS query, the response data to an FETC/MEAS query is generated after the measurement is complete.

- FETCh subsystem Tutorial

FETC? queries the measured data without starting the measurement operation.
If FETC? is sent without making a measurement in advance, a SCPI error (-230,"Data corrupt or stale") occurs, because there is no valid measured data. Be sure to use this command with the INIT command.

Because this command queries the value when the measurement operation was carried out, the response value may be different from the value displayed on the panel.

- MEASure subsystem Tutorial

Queries the measured data after starting a new measurement operation.

MEAS? is equivalent to combining the INIT command and FETC? query.

- Measurable items

The measurable items vary depending on the output mode.

 

Table 6    Measurable Items

Command Output Mode Function
AC DC AC+DC EXT-AC EXT-DC
FETC:CURR:DC
MEAS:CURR:DC
  Yes Yes   Yes Average DC current
FETC:CURR:AC
MEAS:CURR:AC
Yes   Yes Yes Yes AC current
FETC:CURR:AMPL:MAX
MEAS:CURR:AMPL:MAX
Yes Yes Yes Yes Yes Current peak
FETC:CURR:AMPL:MAX:HOLD
MEAS:CURR:AMPL:MAX:HOLD
Yes Yes Yes Yes Yes Current peak
(held value)
FETC:FREQ
MEAS:FREQ
Yes*1 Yes*2 Yes*1 Yes*1 Yes*1 Frequency
FETC:POW:DC
MEAS:POW:DC
  Yes Yes   Yes DC power
FETC:POW:AC
MEAS:POW:AC
Yes   Yes Yes Yes AC power
(active power)
FETC:POW:AC:APP
MEAS:POW:AC:APP
Yes   Yes Yes Yes AC power
(apparent power)
FETC:POW:AC:REAC
MEAS:POW:AC:REAC
Yes   Yes Yes Yes AC power
(reactive power)
FETC:POW:AC:PFAC
MEAS:POW:AC:PFAC
Yes   Yes Yes Yes Power factor of AC power
FETC:VOLT:DC
MEAS:VOLT:DC
  Yes Yes Yes Yes DC voltage
FETC:VOLT:AC
MEAS:VOLT:AC
Yes   Yes Yes Yes AC voltage

*1. Returns the frequency setting in response to FETC:FREQ?/MEAS:FREQ?.

*2. Returns 0 in response to FETC:FREQ?/MEAS:FREQ?.

FETC:CURR:DC/MEAS:CURR:DC

Queries the average measured current of the DC current output. Set the averaging period using SENS:AVER.

Command

FETCh[:SCALar]:CURRent:DC?

MEASure[:SCALar]:CURRent:DC?

Effective output modes    DC, AC+DC, and EXT-DC

Response

Returns the measured value of the DC current output in the NR3 form in response to FETC:CURR:DC?/MEAS:CURR:DC?.

Unit: A

SENS:AVER

Sets the averaging period of the measured values (excluding the peak current).

Command

SENSe:AVERage[:STATe] {ON|OFF|1|0}

SENSe:AVERage[:STATe]?

Parameter

Value: ON(1) Displays the moving average over approximately 3 seconds
  OFF(0) Update every approximately 0.3 seconds (default)

Response

Returns the averaging period of measured values in the NR1 form.

FETC:CURR:AC/MEAS:CURR:AC

Queries the measured value of the AC current output.

Command

FETCh[:SCALar]:CURRent:AC?

MEASure[:SCALar]:CURRent:AC?

Effective output modes    AC, AC+DC, EXT-DC, and EXT-AC

Response

Returns the measured value of the AC current output in the NR3 form in response to FETC:CURR:AC?/MEAS:CURR:AC?.

Unit: A (RMS)

FETC:CURR:AMPL:MAX/MEAS:CURR:AMPL:MAX

Queries the peak measured value of the current output. Set the hold time using SENS:HOLD.

Command

FETCh[:SCALar]:CURRent:AMPLitude:MAXimum[:INSTant]?

MEASure[:SCALar]:CURRent:AMPLitude:MAXimum[:INSTant]?

Effective output modes    All output modes

Response

Returns the peak measured value of the current output in the NR3 form in response to FETC:CURR:AMPL:MAX?/MEAS:CURR:AMPL:MAX?.

Unit: A (PEAK)

SENS:HOLD

Sets the hold time of the peak current.

Command

SENSe:HOLD {SHORt|LONG}

SENSe:HOLD?

Parameter

Value: SHORt Update every approximately 0.3 seconds (default)
  LONG Hold the peak value for approximately 5 seconds

Response

Returns the hold time of the peak current.

FETC:CURR:AMPL:MAX:HOLD/MEAS:CURR:AMPL:MAX:HOLD

Queries the peak value (held value) of the AC current output.

The peak value can be cleared using SENS:CURR:PEAK:CLE.

Command

FETCh[:SCALar]:CURRent:AMPLitude:MAXimum:HOLD?

MEASure[:SCALar]:CURRent:AMPLitude:MAXimum:HOLD?

Effective output modes    All output modes

Response

Returns the peak value of the AC current output in the NR3 form in response to FETC:CURR:AMPL:MAX:HOLD?/MEAS:CURR:AMPL:MAX:HOLD?.

Unit: A (PEAK)

SENS:CURR:PEAK:CLE

Clears the peak hold of the current measurement.

Command

SENSe:CURRent:PEAK:CLEar

FETC:FREQ/MEAS:FREQ

Queries the AC output frequency setting.

Command

FETCh[:SCALar]:FREQuency?

MEASure[:SCALar]:FREQuency?

Effective output modes    DC, AC, AC+DC, EXT-AC, and EXT-DC

Response

Returns the AC output frequency setting in the NR3 form if the OUTPut:COUPling is set to AC or AC+DC in response to FETC:FREQ?/MEAS:FREQ?. Returns 0 if set to DC. (The PCR-M does not measure the frequency.)

Unit: HZ

FETC:POW:DC/MEAS:POW:DC

Queries the measured value of the DC power.

Command

FETCh[:SCALar]:POWer:DC?

MEASure[:SCALar]:POWer:DC?

Effective output modes    DC, AC+DC, and EXT-DC

Response

Returns the measured value of the DC power in the NR3 form in response to FETC:POW:DC?/MEAS:POW:DC?.

Unit: W

FETC:POW:AC/MEAS:POW:AC

Queries the measured value of the active AC power.

Command

FETCh[:SCALar]:POWer:AC[:REAL]?

MEASure[:SCALar]:POWer:AC[:REAL]?

Effective output modes    AC, AC+DC, EXT-DC, and EXT-AC

Response

Returns the measured value of the active AC power in the NR3 form in response to FETC:POW:AC?/MEAS:POW:AC?.

Unit: W

FETC:POW:AC:APP/MEAS:POW:AC:APP

Queries the measured value of the apparent AC power.

Command

FETCh[:SCALar]:POWer:AC:APParent?

MEASure[:SCALar]:POWer:AC:APParent?

Effective output modes    AC, AC+DC, EXT-DC, and EXT-AC

Response

Returns the measured value of the apparent AC power in the NR3 form in response to FETC:POW:AC:APP?/MEAS:POW:AC:APP?.

Unit: VA

FETC:POW:AC:REAC/MEAS:POW:AC:REAC

Queries the measured value of the reactive AC power. If we denote the apparent power and active power as S and P, respectively, reactive power Q is expressed by the following equation.

Command

FETCh[:SCALar]:POWer:AC:REACtive?

MEASure[:SCALar]:POWer:AC:REACtive?

Effective output modes    AC, AC+DC, EXT-DC, and EXT-AC

Response

Returns the measured value of the reactive AC power in the NR3 form in response to FETC:POW:AC:REAC?/MEAS:POW:AC:REAC?.

Unit: VAR

FETC:POW:AC:PFAC/MEAS:POW:AC:PFAC

Queries the power factor of the AC power. If we denote the apparent power and active power as S and P, respectively, power factor PF is expressed by the following equation.

PF = P / S

Command

FETCh[:SCALar]:POWer:AC:PFACtor?

MEASure[:SCALar]:POWer:AC:PFACtor?

Effective output modes    AC, AC+DC, EXT-DC, and EXT-AC

Response

Returns the power factor of the AC power in the NR3 form in response to FETC:POW:AC:PFAC?/MEAS:POW:AC:PFAC?.

FETC:VOLT:DC/MEAS:VOLT:DC

Queries the measured value of the DC voltage output.

Command

FETCh[:SCALar]:VOLTage:DC?

MEASure[:SCALar]:VOLTage:DC?

Effective output modes    DC, AC+DC, EXT-DC, and EXT-AC

Response

Returns the measured value of the DC voltage output in the NR3 form in response to FETC:VOLT:DC?/MEAS:VOLT:DC?.

Unit: V

FETC:VOLT:AC/MEAS:VOLT:AC

Queries the measured value of the AC voltage output.

Command

FETCh[:SCALar]:VOLTage:AC?

MEASure[:SCALar]:VOLTage:AC?

Effective output modes AC, AC+DC, EXT-DC, and EXT-AC

Response

Returns the measured value of the AC voltage output in the NR3 form in response to FETC:VOLT:AC?/MEAS:VOLT:AC?.

Unit: V (RMS)

FETC:CURR:CREST/MEAS:CURR:CREST

Queries the measured value of the crestfactor. Crestfactor is expressed by the following equation.

Crestfactor = AC current / AC peak current

Command

FETCh:CURRent:CREStfactor?

MEASure:CURRent:CREStfactor?

Effective output modes    AC, AC+DC, EXT-DC, and EXT-AC

Response

Returns the measured value of the crestfactor in the NR3 form in response to FETC:CURR:CREST?/MEAS:CURR:CREST?.