EXFO IQS-1700, User Manual, Page: 52 / 204

Measuring Power
44
IQS-1700
Displaying Absolute Power
To display absolute power:
1.
Select the Instrument function tab or the Channels tab of the Settings
function tab (you can use either).
2. Select the channel for which you want to set the offset if you are using
a multichannel power meter.
Note:
Step 3 is not mandatory, but will help you achieve more precise results.
3. Select the appropriate wavelength by using the arrow buttons next to
the corresponding list.
4. Select the appropriate unit by using the arrow buttons next to the
corresponding list (W or dBm).
5. If you are in the
Settings
function tab, click
Apply
to confirm your new
setting.
6. Return to the
Instrument
function tab and click
Absolute
to activate
the mode.
An absolute power measurement in negative W units indicates that the
nulling of the offset was improperly done. If this happens, repeat the offset
nulling operation (see
Nulling Offsets
on page 39).