OP710
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Absolute Accuracy
The absolute accuracy specification includes the total measurement uncertainties
involved in the calibration process including the transfer of the absolute power
standard from N.I.S.T.
Optical Power Meter, Channel Performance
For multichannel instruments, the power meter circuit converts and digitizes the
optical power level with the given sampling interval. Changes in light levels such
as modulation will be averaged within that sampling interval.
Instrument, Warm up Time
Optical power meters, in general, do not need any warm-up time unless the
instrument has to acclimate to a changing environment. In order to calibrate
the instrument or to perform stable measurements, the instrument should be
acclimated for 15 minutes for each 5ºC of temperature differential. For example if
the instrument was stored at 18ºC and brought into an environment of 28ºC the
instrument should be allowed to warm up for 30 minutes.
Responsivity of InGaAs Detectors
Responsivity of Silicon Detectors
Note that other detector types are available such as IN5 (5mm InGaAs) IN10 (10mm InGaAs)
as well as WSR (wide spectral range) and might exhibit a different spectral responsivity.
Definition of Specifications
Spectral Responsivity
Depending on the detector type, InGaAs (Indium Gallium Arsenide) or Silicon the
spectral responsivity, the efficiency of the detector to convert optical power into
electrical current changes with wavelength.