How can I acquire and record pre trigger samples

[tintin_99]

Hi I would like to acquire and record pre trigger samples. I have used many different methods including: 

http://digital.ni.com/public.nsf/allkb/9DE9E3E4DAD9EE93862579C60018B6EA

the problem is I would like to acquire pre trigger samples before start trigger not reference trigger. I think reference trigger is used for stop triggering not start triggering. Could you please help me on this

Thanks? 

[Clad19]

Hi tintin_99,

I hope you are well and thank you for posting your issues to the forum. 

I wanted to ask you some further information in regards to your application:

- What version of LabVIEW do you have?

- What operating system (OS) are you running on your PC/laptop?

- Which application programming interface (API) are you using? NI-DAQmx, NI-Scope?

When you mention you want to acquire the pre-trigger samples before the start trigger and not the reference trigger, how are you currently doing this? Would you be able to post up your code so that everyone can have a look at it?

Here are some further links to look at:

- Continous Analog Input Acquisition with Pre-trigger Scans using 2 E-series Boards

- How Can I Acquire Pretrigger Samples with NI-SCOPE?

- Software Analog Trigger with Pre-Trigger Samples

- Synchronized Analog Input/Ouput with an Analog Trigger and Pre-Triggered Samples

I hope this is alright for now.

Kind Regards,