Re: Electrical noise (was Re: a note about the hanna TDS meters)

[George Slusarczuk <yurko at warwick_net>]

Hello Bill,

I _think_ that they (and all inexpensive meters) use pulsing and
polarity reversal to minimize the errors. With a chip that's easy to do.

Best,

George



William Vannerson wrote:
> 
> >>You need chemically inert probes, with a precise size and spacing, and (I'm guessing here)
> measuring ac resistance...<<
> 
> I see, measuring the resistance accross the field, the distence between the probes.  Change the distance and the resistance would change too.  Okay, sounds totally impractical.  But how does the $15 Hanna instrument measure conductivity?  (Slap me on the wrist if this was discussed earlier and I just didn't understand.)
> 
> Bill Vannerson
> McHenry, IL
> http://ourworld.compuserve.com/homepages/william_vannerson
> 
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References:

• Re: Electrical noise (was Re: a note about the hanna TDSmeters)
• From: "William Vannerson" <William_Vannerson at ama-assn_org>

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