EXFO IQS-1700 High Performance Power Meter for IQS-500/600 - Manual (Page 39)

Setting Up Your High Performance Power Meter
High Performance Power Meter 31
Setting the Measurement Range
Setting the Measurement Range
The measurement range and gain scale applied to the power detector can
be manually selected to prevent the automatic scale adjustment
performed by the instrument. A manual adjustment of the dynamic gain
scale will lock the measurement range to a specific level.
It is necessary to use a manual range to achieve high-rate acquisitions (see
Performing Acquisitions on page 57).
Each channel is adjusted independently in the case of a multichannel
power meter.