EXFO IQS-12004B DWDM Passive Component Test System for IQS-500 - Manual (Page 169)

Using the Power Meter Linearity Verification Tool
DWDM Passive Component Test System 157
Selecting the DUT and Reference Power Meter
Selecting the DUT and Reference Power Meter
In order to perform a linearity verification, you need to specify which
power meter has to be tested (DUT) and which power meter will act as a
reference.
Note: You must have performed the hardware initialization and the nulling
before being able to select power meters.
³
To select the DUT, use the up/down arrows next to the Power meter:
box from the DUT panel.
³
To select the reference power meter, use the up/down arrows next to
the Reference Power Meter: box from the Settings panel.
I
MPORTANT
Any power meter can be used as a reference power meter. However,
to avoid erroneous results, make sure that the module you intend
to use as a reference has been properly calibrated.
Power meter
to be tested
Calibrated power meter acting as a reference