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From: Chris Matthaei
Subject: Re: Automotive EMI
X-Newsreader: NWReader V 0.9.9.10 BETA (c) 2001 by Stefan Reck
NNTP-Posting-Date: Tue, 24 Sep 2002 11:51:12 CDT
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Date: Tue, 24 Sep 2002 16:51:12 GMT
Bill Paul wrote:
> Chris Matthaei wrote in
> > I've been trying to do some low rate (50samples/sec) data acquisitio=
> > of some sensors on my engine (Ford 5.0). I noticed that as the load =
> > the engine increases, I see a large increase in noise in the signal.
> > I'm guessing this is due to the spark voltage increasing with load.
> > Anyway, I'm wondering how I can clean this up. I was thinking of usi=
> > a simple active low pass filter using a 741. 10Hz would probably be =
> > good cutoff. Does anyone think this will help? Any other suggestions=
> You should run your ADC as fast as it will go, then average the signal=
> times per second. Everyone elses filtering suggestions seem good as we=
> but as long as you are taking one sample, there will always be some=20
> quantization error or noise on the signal. If you can sample at 1mS, a=
> average 20 samples, you will be in really good shape. Enough so that y=
> can remove alot of your analog filtering.
Unfortunately, 50samples/sec is already the maximum. I'm using a paralle=
port A/D converter based on a MAX186.
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