8 thermocouple channels
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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 --------------------------------------- Posted through http://www.EmbeddedRelated.com
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. |