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Measurement Instructions
Use the measurement instructions documented in this
section to perform measurements and return the
desired results to the computer. Four basic measure-
ment instructions are used: CONFigure, FETCh, READ,
and MEASure. Because the command trees for each of
these four basic measurement instructions are identi-
cal, only the MEASure tree is documented.
To perform a measurement, append to the measure-
ment instruction a POWer or LENGth function. The
POWer functions select power, frequency, or wave-
length measurements.
When the :SCALar command is used, data for a single
measurement value is returned. When the :ARRay com-
mand is used, multiple data values are returned.
The MEASure measurement instruction always
acquires new measurement data. In order to obtain
both wavelength and power values from the same mea-
surement data, use two FETCh commands. This is
shown in the following program fragment:
OUTPUT 720;":INIT:CONT OFF;"
OUTPUT 720;":CONF:ARR:POW MAX"
OUTPUT 720;":INIT:IMM"
OUTPUT 720;":FETC:ARR:POW?"
ENTER 720:powers$
OUTPUT 720;":FETC:ARR:POW:WAV?"
ENTER 720:wavelengths$
In the example above, the data in the power and wave-
length arrays are returned in the same order so that
powers can be matched to wavelengths. You can also
send a MEASure command followed by a FETCh com-
mand.
The commands in this subsystem have the following
command hierarchy:
{:MEASure | :READ[?] | :FETCh[?] | :CONFigure[?]}
{:ARRay | [:SCALar] }
:POWer[?]
:FREQuency[?]
:WAVelength[?]
Measurement Instructions 5-11
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