Trigger hold-off

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erspearson
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Trigger hold-off

Post by erspearson » Thu Sep 06, 2012 2:17 pm

Most of the analogue scopes I've used over the years have had a trigger hold-off control that sets the minimum time before a trace can be re-triggered. I found it often useful and quite intuitive to use, especially in conjunction with the trigger delay control. Example: capturing part of a complex signal that repeats but has a dead time between the repeats - like a composite analogue video signal, say.

I can't find a similar control in PicoScope. Am I missing something? I'd expect it to be sitting right next to the trigger delay control.

Edward
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smart thinking for smart buildings

ziko
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Re: Trigger hold-off

Post by ziko » Fri Sep 07, 2012 9:57 am

Hi Edward,

We do not have a trigger hold-off feature in our devices at the moment. Depending on your signal you might not need it, so if you set up a trigger on Repeat and choose an appropriate time base this may still work.

Could you describe your signal to me in more detail and what you are looking for in your triggering.

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Ziko

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erspearson
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Re: Trigger hold-off

Post by erspearson » Fri Sep 07, 2012 4:51 pm

In my case it's an I2C signal that's doing a frame refresh on an OLED display. But my initial example of a composite video signal is a well known one. A PAL, interlaced, composite video signal has a frame refresh of 25Hz. That's 40ms.
My choices just using the timebase are 2ms/div (20ms) which too fast and 5ms/div (50ms) which is too slow.

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Re: Trigger hold-off

Post by ziko » Mon Sep 10, 2012 10:27 am

Hi,

Yes I understand what you are saying, there is an alternative, it depends on which scope you have though.

Instead of actually capturing multiple waveforms you can capture one long capture in streaming or block mode (depends on the device you have).

What device do you have?
Ziko

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erspearson
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Re: Trigger hold-off

Post by erspearson » Tue Sep 18, 2012 2:42 pm

It's a 2203.

ziko
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Re: Trigger hold-off

Post by ziko » Fri Oct 05, 2012 9:35 am

Yeah unfortunately with this product you will not be able to do what you want. The alternative is a large memory device and just capture a big block of data, however the price does start to go up.

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JSGordon
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Re: Trigger hold-off

Post by JSGordon » Wed Jan 16, 2013 8:24 pm

I would like to add my support for the addition of a trigger holdoff feature. So far it is the only thing I miss on the Pico 2208 compared to a bench DSO.

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