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Measure delta, drift, and signal-to-noise
The format of returned data
To select a measurement, use one of the following
STATe commands:
CALC3:DELT:POW:STAT (delta power)
CALC3:DELT:WAV:STAT (delta wavelength)
CALC3:DELT:WPOW:STAT
CALC3:DRIF:STAT
CALC3:ASNR:STAT (signal-to-noise ratio averaging)
If you select a drift measurement, you can select one of
the following additional states:
CALC3:DRIF:DIFF:STAT
CALC3:DRIF:MAX:STAT
CALC3:DRIF:MIN:STAT
CALC3:DRIF:REF:STAT
The :CALCulate3:DRIFt:PRESet command turns off the
minimum, maximum, difference, and reference states
but leaves the drift state on.
Attempting to turn more than one state on at a time
results in an "–221 Settings Conflict" error.
The *RST and SYSTem:PRESet commands turn all cal-
culations off.
CALCulate3:PRESet turns off any CALCulate3 calcula-
tions.
Measurements are returned as strings
All measurement values are returned from the WDM
channel analyzer as ASCII strings. When an array is
returned, the individual values are separated by the
comma character.
Determine the number of data points
When a FETCh, READ, or MEASure command is used
(with ARRay specified), the first returned value indi-
cates the total number of measurement values returned
in the query.
If you use the :CALCulate1:DATA?, :CALCulate2:DATA?,
or :CALCulate3:DATA? queries to query data, send the
:POINts? query first to determine the number of values
returned in the string. The string does not contain a
first value which specifies the string length. This is
shown in the following example:
Making Measurements 4-13
(delta power and wavelength)
(drift)
(difference)
(maximum drift)
(minimum drift)
(drift reference values)
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