Sync external PXI trigger

Hello

I use a PXI-5122 to record an external event triggered.  When I run my setup using an oscilloscope, the relaxation and the answer are aligned (see first attachment, response is the most noisy, curved channel 1).  Transfer when the installer for LabVIEW, the shutter is badly programmed and seems to happen until the trigger is actually received (see second attachment).  The outbreak of the second curve point should be at the beginning of the climb and it should also be at t = 0.  The trigger that I use is triggering external edge Ref-OR-SCOPE (VI included as the third attached).

I guess this problem is caused by the trigger being a trigger for reference, but I don't see other kinds of relaxation to use and I don't know how to deal with this problem.  Can anyone help?

Hi Glen,

Looks like you're right that the problem is that the scope is configured to use a reference trigger.  By default, the reference position is 50%, which means that half of the samples in an extraction will be before the outbreak and half occur after.  The scope accomplishes this by storing data continuously as it is acquired in a circular buffer so that the most recent samples are available when the reference trigger is received.

In this perspective, the challenge is really very simple – you can specify the reference Position as input to the niScope configure VI of horizontal sync:

Fair value the reference position 0 (default is 50) and you will receive all of your data after the trigger occurs.  A value of 100 would give you an entire record of samples before firing.

Best regards

John

Tags: NI Hardware

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