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Re: [ts-7000] TS-7400 EP9302 ADC channel switching

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Subject: Re: [ts-7000] TS-7400 EP9302 ADC channel switching
From: Jason Stahls <>
Date: Tue, 08 Mar 2011 13:09:29 -0500
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On 03/08/11 12:54, Russell N. Nelson - rnnelson wrote:
>  I'm having trouble reading two ADC channels in quick succession, or even in 
> slow succession. Values from one channel bleed over into another channel. And 
> it's not just my code, it's also the Technologics' test7400ADC. If you run it 
> like this:
> 
> while ./test7400ADC; do echo -n ''; done
> 
> then sooner or later it craps out, and when it does, it prints a value that 
> clearly came from a different channel. I've tried reading twice and 
> discarding the first. inserting a 100ms delay betweeen these two reads, and 
> it still happens. How can I fix this? I need to measure both voltage and 
> current consumed, and I have the two sensors hooked up to ADC channels.

I don't mean to be condescending, but are you sure it's not a interface
issue?  If you have any de-coupling caps or opamp buffers not biased
right ect it could bleed over due to induction.  So does the reading you
get from the ADC match a scope/meter on the same lead?

- -- 
Jason Stahls
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