Keysight N774-C & 8162-C Series User’s Guide
69
Definition of Terms
3
Uncertainty at reference conditions
The maximum relative difference U between measured (displayed) power
M and actual (true) power P for the specified set of reference conditions,
including all uncertainties in the calibration chain from the national
calibration laboratory to the test meter, expressed in percent.
Powers expressed in Watts.
U = 100% * (M/P - 1)
Conditions:
Reference conditions as specified.
Wavelength range
The range of wavelengths for which the power meter is calibrated, or that
can be set at the attenuator and for which the specifications apply (if not
differently stated).
Warm-up time
Time after power-up of the acclimated instrument after which the
specifications and characteristics apply.
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