NI-scope PCI-5124 with 2 triggers

Question

HI,
I would like to ask about the start and reference trigger with PCI-5124.
I found an sample VI on the following link, however it doesn't work as I expected.
http://zone.ni.com/devzone/cda/epd/p/id/2998
The VI "start_and_reference_trigger.vi" can detect both start and reference trigger in my system and they start data acquisition.
It starts data acquisition when both start and reference triggers are input.
However what I would like to do is:
 1. Sampling rate at 200MHz with record length 1500 with one channel.
 2. Receive the start trigger (i.e. 50Hz)
 3. Receive the reference trigger (i.e. 50kHz)
 4. For every reference trigger, I would like to acquire the data, i.e. acquiring 1500 data for each 100 reference trigger (not with the combination with the start trigger)
Start trigger: _|^|_________________________________________
Ref   trigger:______|__|__|__|__|__|__|__|__|__|__|__|__|__|__|____
                                 ^    ^    ^    ^   ^   ^   ^   ^    ^    ^   ^    ^    ^   ^  
                                 trigger timings that I would like to acquire
Trigger channels that I'm using are:
 Start trigger:  PFI 0
 Ref trigger:    PFI 1
With the sample VI "start_and...", I found that it acquires when both start and reference trigger comes and the data acquisition is only after the one reference trigger. 
I hope my explanation is understandable and I can have a solution soon.
Solved!
Go to Solution.

Answer 1

Hi Tom,
This example configures a start and reference trigger, but only for a single record. It is inside a loop so it will continue to require a start and reference trigger for every record. Based on your description of the problem, you would like to perform a standard multi-record acquisition of 100 records, but you would like to implement a start trigger at the beginning of the acquisition. To do this, you can simply open the shipping example "niScope EX  Multi Record.vi" which can be found in the LabVIEW Example Finder or by navigating from your Windows Start menu to Programs » National Instruments » NI-SCOPE » Example. You will need to add the property node to set your Start Trigger source to be PFI 0, but other than that, it should work fine. I went ahead and created a simplified version with the Start Trigger implemented, attached below. Hope this helps!
Daniel S.
National Instruments
Attachments:
niScope EX Multi Record with Start.vi ‏33 KB