EXFO IQS-1600 High-Speed Power Meter for IQS-500/600 - Manual (Page 73)

Performing Acquisitions
High Speed Power Meter 65
Selecting the Acquisition Mode
Note: The X and Y values are displayed in the currently selected unit.
3. Enter the appropriate X or Y values in the corresponding lists.
4. Click to confirm your setting.
If you select a Single acquisition rate, the External Trigger switch and
Trigger Position (%) options become available.
The External Trigger switch allows you to select whether the acquisition
will be externally triggered on positive or negative TTL voltage transitions.
Choose
to select positive (from 0 to 5 V) transitions, or to select
negative (from −5 to 0 V) transitions.
The Trigger Position (%) list allows you to set the number of points that
will be acquired on the file before the trigger position is met by using the up
and down arrow buttons on each side of the list.
For more information about the external trigger function, seeExternal
Trigger on page 82.
Once you have launched your acquisition, you will notice a message
indicating that the power meter is waiting for the trigger. This message will
remain until the trigger condition is met.