4227 triggering a single pulse with EXT on pulse-width mode

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cpc333
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4227 triggering a single pulse with EXT on pulse-width mode

Post by cpc333 »

Hello,

This post is related to a previous one, where I managed to get pulse-width mode working with EXT but I was using a 10kHz square wave as the trigger signal: http://www.picotech.com/support/topic11977.html

Now I'd like to trigger off of a single ~40us long pulse. It works fine with channel A or B as the trigger input but when trying to use EXT, weird things happen. I've attached a psdata file showing the scope set to trigger only for pulses less than 10us on EXT. However, the scope triggers for a 100us long pulse as shown (pulse generator output connected with a T to channel A and EXT). Not sure what the EXT input is doing to mess this up.

Any help? Thanks 8)
Attachments
picoVersion.PNG
pulseData.psdata
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ziko
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Re: 4227 triggering a single pulse with EXT on pulse-width m

Post by ziko »

Interesting, I cannot recreate the problem, does this happen all the time or did it happen just the once?
Ziko

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ziko
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Re: 4227 triggering a single pulse with EXT on pulse-width m

Post by ziko »

We have actually managed to recreate it, the questions still stands though is the problem repeatable and are there steps you can give as to how you get this?
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cpc333
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Re: 4227 triggering a single pulse with EXT on pulse-width m

Post by cpc333 »

Yes, it was definitely repeatable. I'll look at it again today and see if I can provide any more hints.

cpc333
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Re: 4227 triggering a single pulse with EXT on pulse-width m

Post by cpc333 »

I've decided I can manage with just a normal rising trigger. But it would be a nice feature for this advanced trigger to work with EXT . Thanks!

ziko
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Re: 4227 triggering a single pulse with EXT on pulse-width m

Post by ziko »

Yeah it seems to be a bug, I have reported it to our software engineers.
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cpc333
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Re: 4227 triggering a single pulse with EXT on pulse-width m

Post by cpc333 »

Great, thanks! Good luck fixing it!

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