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PS2206B, Trigger direction works not fine

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PS2206B, Trigger direction works not fine

Postby Jan91 » Fri Feb 02, 2018 8:27 am

Hello,

I use PS2206B with Labview and I have some problems with the trigger direction:

Configuration:
Channel A: Signal (20kHz)
Channel B: Trigger Signal (for testing I connected it parallel to Channel A)

timebase 2 (8 nsec.) / 300.000 samples
trigger: Channel B / Autotrigger = 0 / Threshold = 2V / Trigger Direction = Rising / Trigger Delay = 0

It works, but at almost 1 of 4 measurements the trigger direction is wrong.
The Signal on Channel A starts at 2V, but with a falling direction.
I use the PS2000aSetSimpleTrigger.
I tried Block Mode and Rapid Block Mode, no difference.
It becomes better, if I use a higher timebase. But in my application I need the shorter timebase.

Can you please help me.

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Re: PS2206B, Trigger direction works not fine

Postby Jan91 » Fri Feb 02, 2018 11:11 am

Today I find out, that this happens only if the range of the trigger channel (B) is 5V.
If I change it to 10V (or any other not equal to 5V) , everything works fine.

That is a bit strange, but reproducible.

Jan
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Re: PS2206B, Trigger direction works not fine

Postby Martyn » Fri Feb 02, 2018 1:23 pm

It's possible that this is down to noise on the signal.

Can you try changing from the Simple Edge trigger to an Advanced Edge trigger and change the hysteresis level to a higher value.
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