Scope does not trigger

Hello,
I am trying to trigger a scope at a certain point. I have a test signal coming after a regular sinusoid. I want to measure the output when the test signal arrives. What happens is that when my test signal comes after 1 second the trigger works perfectly fine but when my test signal comes after 3 seconds the scope does not trigger at the point I want and keeps on triggering at unwanted points. This is a conceptual question. Could anyone please help me in that.
Thanks,
Krunal

Hello Krunal,
I am not exactly sure what your external signal looks like, however I can suggest a couple things for you to look at. First, if the absolute value of your sine wave amplitude is less than the test point you want to measure, the scope can simply level trigger at that point. It should not matter if the signal comes in after 1 seconds or 3 seconds. The only problem you might be seeing with this is a timeout error. This is caused by the read function not being able to sample enough data within the default 5 seconds limit. Adjusting the timeout would help if you are getting this error.
If your test signal value you need to trigger off of is within the absolute value of your sine wave signal it becomes more difficult because if you specify to trigger off of a rising edge 0.5V signal this point will occur many times before the ideal trigger point. Perhaps a combination of using the trigger hold off and trigger delay might help you time the start of your acquisition a little better. If this does not help, can you please post more detail about the sine wave, your test point you want to trigger off and the behavior you are currently seeing.
Regards,
Jesse O.
Applications Engineering
National Instruments
Jesse O. | National Instruments R&D

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