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4-15
Programming Commands
Measurement Instructions
Measurement Instructions
Use the measurement instructions documented in this section to per-
form measurements and return the desired results to the computer.
Four basic measurement instructions are used: CONFigure, FETCh,
READ, and MEASure. Because the command trees for each of these
four basic measurement instructions are identical, only the MEASure
tree is documented.
To perform a measurement, append to the measurement instruction a
POWer or LENGth function. The POWer functions select power, fre-
quency, wavelength, or wave number measurements.
When the :SCALar command is used, data for a single measurement
value is returned. When the :ARRay command is used, multiple data
values are returned.
The MEASure measurement instruction always acquires new measure-
ment data. In order to obtain both wavelength and power values from
the same measurement 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 wavelength 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 command.