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About frequencies(for Serenity)

Hi Serenity ,I ’m luiart.
First of all thanks for the program.
I understand that I shouldn’t send messages only to you but I’ve seen that you can help me very much.
I’ d like to have your opinion about this problem, if it’s possible: I hope so.
I’ve an optical transducer to take some reflective targets: there are 80 targets in a lap of 6550 metres. The transducer generates a square wave every time it sees a target. I send this square wave to the counter of my daq-board and it measures the period, than the frequency . I have a constant frequency , but the counter measures a not-constant frequency: the difference between two frequencies is always the same 0.28ms or a multiple of it.
What is it u
p to? Does it depend on the delay of my transducers? Does it depend on my program? Have you ever seen something like this?
I send you the file with the frequencies that I have acquired. I hope that you can help me.
Thanks VERY MUCH.
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Sorry Luiart, I cannot help you.
It just looks like you "see" the resolution of your measurement system that might need enhancement.
Could you give more details (a sketch/code-snip)?
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