EXFO IQS-1700 High Performance Power Meter for IQS-500/600 - Manual (Page 58)

Measuring Power
50 IQS-1700
Using the Offset Function
Using the Offset Function
The offset function is used when you want to take into account, in the
power displayed, a known gain or loss in the link that is not already
included in the signal reaching the detector. Contrary to the correction
factor, which applies to a specific wavelength, the offset value applies to
any wavelength when it is enabled in a specific channel.
To enter an offset value:
1. From the Settings function tab, select the Channels tab.
2. Select the channel for which you want to set the offset if you are using
a multichannel power meter.
3. From the Offset list, use the arrow buttons to adjust the value.
4. Click Apply to confirm your new setting.