Operation
Publication 21555, Rev. E, September 2002
2-19
2.5.13
Reading Power Measurements
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FETCh?
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MEASure?
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READ?
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*OPC
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*OPC?
These commands return measurement data from the 58542. During Normal mode the data will be single
measurement values. During Swift or Burst modes, the data will be an array of values. Generally, it is a
single array if one sensor is connected and calibrated, and a dual array if two sensors are connected and
calibrated.
FETC?
Syntax:
FETCh<channel 1 to 2>?
Example:
OUTPUT @PWR_MTR;FETC1?
! READS PREVIOUSLY TRIGGERED CHANNEL 1 POWER
! NORMAL, SWIFT, BURST MODE DATA
Response:
Whatever is in the output buffer whether it is a new measurement or an old one.
Description:
The FETCh? query command returns post-processed measurement data from the active
channels of the 58542. After receiving FETCh? the 58542 will output the contents of its active
data output buffer. The data size and output format of the buffer are dependent upon channel
and measurement mode configuration.
For example, if channel 1 is defined as sensor 1 and channel 2 is defined as sensor 2/1, the
FETCh? query command will return the power level incident upon sensor 1 and the ratio of the
power levels incident upon sensor 2 and 1. FETCh? is used with NORMal mode
measurements when INITiate:IMMediate is active, and for reading SWIFt, BURSt Mode
measurement data from the meter’s data buffer.
MEAS?
Syntax:
MEASure<channel 1 to 2>[:SCALar:POWer]?
Example:
OUTPUT @PWR_MTR;MEAS2?
! ARMS, TRIGGERS AND MEASURES CHANNEL 2
! POWER IN NORMAL MODE
Response:
A power measurement.
Description:
The MEAS? command returns measured data from the active software calculation channels
of the 58542. The MEAS? command will also initiate the trigger cycle and will turn on the Auto
Averaging mode; that is, measurement will be triggered and the data will be transmitted from
the power meter. This is in contrast to the FETCh? command, which is capable of causing
immediate output of the measurement data but not initiating the triggering cycle.
READ?
Syntax:
READ<channel 1 to 2><channel 1 to 2><channel 1 to 2>[:POWer]?
Example:
OUTPUT @PWR_MTR;READ2?
! TRIGGER MEASUREMENT AND READ CHANNEL 2
Response:
A power measurement.
Description:
The READ[:POWer]? query command triggers measurement and sends the data to the
controller. The READ? command enables the power meter to acquire data at the next
instrument trigger and return post-processed measurement data from the active channels of
the 58542. READ uses the current sensor averaging setup.
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