EXFO IQS-1500 Power Meters for IQS-500/600 - Manual (Page 39)

Preparing Your Power Meters for a Test
Power Meters 31
Nulling Offsets
To perform an offset nulling:
1. Install the protective cap over the detector port.
2. Under Channel, click the Nulling button. A message prompts you to
ensure that the detector cap is properly installed.
3. Select OK to perform the offset nulling, or Cancel to exit.
A red message appears beneath the power value.