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Signal Generator Time Drifts
PostPosted: Thu May 28, 2009 11:30 pm Reply with quote
draudio
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Joined: 21 Oct 2008
Posts: 3




Normally I use an external generator for my noise source, but for a variety of reasons I tried to use the internal generator today. I was outputting Pink Noise of various sample lengths.

I noticed some weird behavior in the Transfer Function measurements and traced it back to a variance in the time of the signal output from the generator. It "moves" forward and back in time approximately 0.5ms. I was not able to determine the exact pattern, but it seems somewhat cyclical, every 5-10 seconds it shifts, and then 5-10 seconds later shifts back.

Obviously, this makes it difficult to use for this type of measurement! ;o)

I use a Dell Latitude D820 with a FirePod FP10 interface. The software is monitoring the internal digital signal by selecting "out" as the reference. Could this be a result over asking too much from my laptop CPU?

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Thanks!

Dave
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PostPosted: Sun May 31, 2009 10:23 am Reply with quote
Bruce
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Joined: 19 Apr 2005
Posts: 459
Location: Minneapolis, MN, USA




See this message about dropouts. It is also likely to cause the problem that you are seeing.

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Bruce C. Olson
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