EXFO IQS-1500 Power Meters for IQS-500/600 - Manual (Page 80)

Calibrating Other Power Meters with the IQS-1500
72 IQS-1100/IQS-1500
Nulling Offsets for Calibration
Nulling Offsets for Calibration
The Null window allows you to perform an offset nulling on your modules
(both the Calibration Power Meter and the DUT Power Meter). This will
provide you with a “clean” measurement, with no electrical offsets to
impede your calibration process.
To perform an offset nulling on your modules:
1. Place a protective cap on the detector ports.
2. Confirm that you have used the protective caps by checking the
corresponding box in the window.
3. Click Start NULL Session to start the process.