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From: antedeluvian on 14 Jun 2010 20:33
>Hello
>
>I need to sample 8 thermocouple channels at about 10 Hz per channel (or
>more). I would like to get some ideas of what IC to use.
>
>How sensitive is a thermocouple + cables to outside interference? Do I
need
>to filter out any voltage spikes from my measurements?
>
>
>
>
There is a wonderful H-P/Agilent app note on all forms of temperature
measurement, including everything you need to know about thermocouples to
multiplex the signals and cold junction compensation

http://cp.literature.agilent.com/litweb/pdf/5965-7822E.pdf

Then turn to Linear Tech and Analog Devices and Maxim for app notes on
thermocouples and products to realize your design.

-Aubrey



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From: Neil on 15 Jun 2010 23:50
On 6/14/2010 9:47 AM, John Smith wrote:
> Hello
>
> I need to sample 8 thermocouple channels at about 10 Hz per channel (or
> more). I would like to get some ideas of what IC to use.
>
> How sensitive is a thermocouple + cables to outside interference? Do I need
> to filter out any voltage spikes from my measurements?
>
>
>
You can get a Chip from Analog devices the handles the whole thing.
Or you can use opamps and a mux. Otherwise it is a maesurement of a
small voltage. so noise will matter as much as any other type of
measurement.
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