EXFO IQS-1500 Power Meters for IQS-500/600 - Manual (Page 81)

Calibrating Other Power Meters with the IQS-1500
Power Meters 73
Storing Reference Power Meter Measurements Automatically
Storing Reference Power Meter Measurements
Automatically
The Ref. Meter Measurement window allows you to take a series of power
measurements automatically on your Calibration Power Meter. You can
specify the number of power measurements you want to take, and the
time interval between each measurement.
This window is there to help you by:
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Avoiding repetitive power measurements
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Calculating the standard deviation of the power measurements taken
on the IQS-1500.
This value is a good indication of the stability of the source used for
calibration. When the standard deviation exceeds 1%, a message will
appear warning you that the source might not be stable enough.