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InfiniiumDSA91204A, count number of trig

Question asked by Olivier on May 31, 2010
Latest reply on Jul 8, 2010 by algoss

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Hello,
I'm using a Infiniium DSA91204A scope for serial high speed measurement.

I have a test wich I need to count the number of pattern received. Actually I trig with InfiniumScan on Pattern A84B. As I'm using a 81134 for pattern generator, it can't just send the Pattern 1 time, it play it in loop.
So the solution I have is to build a long pattern that contain 100 time my specific pattern (A84B) for exemple and with 0101....01 at the beginning and the end. In this case I can do a Run on Pattern generator, wait xx ms (time to run the 100 pattern in the file) and then Stop.
What I want to do, is to configure the Scope to trig on my A84B (it's ok for that) and after the generator stopped, I want to count the number of trig on the Scope.

Actually I didn't find any command in the Programmer guide or by looking on the scope directly.

Is someone can help me on this please?

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ko2054 Jun 23, 2010 11:59 AM

Hello Olivier, I am not aware of any command to count trigger pulses. You could connect a BNC cable from the rear panel trigger out BNC to a frequency counter and set the counter to count events. Everytime the scope triggers there will be an output pulse from the scope that the counter can use to increment its counter. Will that work for you?

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algoss

Jul 8, 2010 5:15 AM

Olivier, remember that an Infiniiscan trigger is SW based. You don't indicate how far apart the repetitions of the pattern are, but Infiniiscan is very slow. I doubt that you would see more than a few triggers per second. To do a serial trigger, the scope has to:
- Capture the analog data
- Do clock recovery to find the data rate
- find the individual bits
- search for the 16bit pattern in the recovered bits.

Depending on the speed of your serial channel, the 9000 series scopes might be a better choice, since it does the serial triggering in HW.

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ko2054 Jun 23, 2010 11:59 AM
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Hello Olivier, I am not aware of any command to count trigger pulses. You could connect a BNC cable from the rear panel trigger out BNC to a frequency counter and set the counter to count events. Everytime the scope triggers there will be an output pulse from the scope that the counter can use to increment its counter. Will that work for you?
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algoss Jul 8, 2010 5:15 AM
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Olivier, remember that an Infiniiscan trigger is SW based. You don't indicate how far apart the repetitions of the pattern are, but Infiniiscan is very slow. I doubt that you would see more than a few triggers per second. To do a serial trigger, the scope has to:
- Capture the analog data
- Do clock recovery to find the data rate
- find the individual bits
- search for the 16bit pattern in the recovered bits.

Depending on the speed of your serial channel, the 9000 series scopes might be a better choice, since it does the serial triggering in HW.
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InfiniiumDSA91204A, count number of trig

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