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Subject: Re: Thermocouple isolation amplifiers

Date: 10/05/02 at 9:09 PM
Posted by: Ray
E-mail: rrogers@plaidheron.com
Message Posted:

In Reply to: Re: Thermocouple isolation amplifiers posted by RJ on 10/05/02 at 8:07 PM:

Sorry no help. You could try one of those $35 PCboard houses though. If you wait about 3 months I could ship you one of mine. Digikey has a selection; and they don't ask for a DNA sample before they take your money!
Don't forget to stop calorie flow/temperature differences at the board termination! I used a NI thermocouple amplifier and got .05degC readings due to the temperature gradient at the incoming pins!
A good solution is to split the constantine (or whatever) wire and arrange the connector
Co
Cu
Cu
Co
For each thermocouple. Impractical but indicative of the kind of thinking that should be done. Every stray calorie that wanders away is a potential thermal gradient.

Sorry, but I have had a couple of hard months thinking about things just like this. I like to get things right before I commit. Measure twice, cut once!

Ray


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      Loswer hotdog   Posted at: 08/21/03 (0)


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