Trigger on interval between 2 channels

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bennog
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Trigger on interval between 2 channels

Post by bennog » Wed Jul 10, 2019 7:36 am

I have a 4444 scope and want to trigger when the time difference between ch C and D from 0 to 24V is bigger than 50 ms.
So when ch D follows ch C < 50 ms do nothing but when ch D stays low or takes 100 ms after ch C then trigger.

Benno

Gerry
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Re: Trigger on interval between 2 channels

Post by Gerry » Fri Jul 12, 2019 8:17 am

Hi Benno,

If I understand you correctly, what you need is 2 channel logic triggering with timing, which we don't have in a PicoScope, so you would need some hardware to implement this. You could implement it with a watchdog timer function, i.e. Ch C starts a counter/timer, and Ch D stops the Timer, with the timer timing out at 50ms and a trigger signal being generated from the Terminal Count. Or you could just OR the 2 signals together (reduce the voltages to logic levels and invert any input if required) and trigger on a pulse width less than 50ms.

Regards,

Gerry
Gerry
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bennog
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Re: Trigger on interval between 2 channels

Post by bennog » Fri Jul 12, 2019 8:30 am

I had taken this the other way around, with the SDK capture the data in streaming mode at 5MS/sec and process this data in a separate thread and save the raw data on the HD.

I am now in the proces of importing this RAW data back into .psdata format.
Seems quite simple updating the valuechunk andcollectiontime array should be sufficient in an existing .psdata file with the same setup as used with the SDK.

Benno

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