External trigger – EXFO IQS-1600 High-Speed Power Meter for IQS-500/600 User Manual
Page 90
Using the External Trigger and Analog Outputs
82
IQS-1600
External Trigger
External Trigger
The external trigger is used to synchronize or stimulate the acquisition of
power measurements with an electrical signal (TTL level). Single
acquisitions of up to 4096 Hz can be performed. The external trigger can
only be used with a Single acquisition rate. The external trigger can be
used to start a file acquisition.
Note: Since externally triggered acquisitions may only be performed using a high
acquisition rate, a manual power range must be set for all channels.
To prepare an externally triggered file acquisition:
1. You must select the Single acquisition rate (see Performing
2. In the Settings function tab, select Data Acquisition.
3. Click on Trigger to select it.
4. Determine whether the acquisition will be externally triggered on
either positive or negative TTL voltage transitions by selecting
or
, respectively by using the External Trigger switch.
At the fastest sampling rate (4096 Hz) during a single acquisition, the
instrument can store at least four seconds worth of data per channel
(depending on the number of channels per instrument). The trigger will be
set at instant 0. You may want to see the data acquired before the trigger
occurred. You can enter the desired percentage of data before the trigger
position from the Trigger position (%) box.
When you enable the externally triggered acquisition with Start, the
acquisition will wait for the voltage transition to occur before storing the
data on file.