EXFO IQS-1700 High Performance Power Meter for IQS-500/600 - Manual (Page 31)

Setting Up Your High Performance Power Meter
High Performance Power Meter 23
Selecting a Channel (Multi-Channel Models)
Selecting a Channel (Multi-Channel Models)
The optical channels on multi-channel models are independent.
To select an optical channel:
From the Instrument function tab, go to Channel and use the arrow
buttons next to the channel number to change it.
OR
Click the appropriate data display zone.
A colored frame will indicate your selection.