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Entry  Thu Jun 8 14:26:23 2017, Rebecca Schmitz, AND Trigger problems with 2-3 channels 
    Reply  Thu Jun 8 15:52:20 2017, Stefan Ritt, AND Trigger problems with 2-3 channels 
       Reply  Fri Jun 9 09:44:33 2017, Rebecca Schmitz, AND Trigger problems with 2-3 channels Screenshot1.pngScreenshot2.pngScreenshot3.png
          Reply  Thu Jun 22 21:36:08 2017, Stefan Ritt, AND Trigger problems with 2-3 channels 
Message ID: 620     Entry time: Thu Jun 22 21:36:08 2017     In reply to: 618
Author: Stefan Ritt 
Subject: AND Trigger problems with 2-3 channels 

Hi,

from our screenshots I see the following:

- you have sometimes a huge oscillation in your preamplifier. Fix this first before doing any waveform recording

- your signals are barely 20 mV, and your trigger threshold is 20 mV. The coincidence only triggers when both signals are below the trigger threshold at the same time, and the overlap must be longer than 4-5 ns. So if your signals  are not exactly in time, you won't get a coincidence trigger

Stefan

 

Rebecca Schmitz wrote:

Hello,

It seems that a coincidence with two fixed channels suddenly works. I don't know why.

Screenshot 1 shows the trigger settings for the coincidence with two channels.
Screenshot 2 shows the oscilloscope surface.
Screenshot 3 shows the configuration. In the background there is a coincidence with three channels.

In contrast to the coincidence with two channels this doesn't look good.

Rebecca

Stefan Ritt wrote:

Can you post a screenshot where I can see the channel waveforms, the configuration and the trigger settings?

Stefan

Rebecca Schmitz wrote:

Hello,

I work with the DRS4 Evaluation Board V5 and I have a problem with the software.

I have a problem with the AND trigger setting.
For this I have chosen the AND trigger function. However, when ONE channel senses an impulse, it triggers. I'm not able to see signals in the other channels, which I selected for the coincidence.

What is the cause of this? Maybe the time window?

I would like to measure a coincidence with two or three random channels. Is it possible?

Thanks for the help.

Rebecca

 

 

 

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