8 thermocouple channels
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From: John Smith on 14 Jun 2010 09:47 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?
From: Tauno Voipio on 14 Jun 2010 11:17 On 14.6.10 4:47 , 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? How are you planning to handle the cold junction compensation? -- Tauno Voipio tauno voipio (at) iki fi
From: John Smith on 14 Jun 2010 11:29 "Tauno Voipio" <tauno.voipio(a)notused.fi.invalid> wrote in message news:hv5h5n$h77$1(a)news.eternal-september.org... > How are you planning to handle the cold junction compensation? A temperature sensor at the connection point.
From: hamilton on 14 Jun 2010 12:06 On 6/14/2010 9:29 AM, John Smith wrote: > "Tauno Voipio"<tauno.voipio(a)notused.fi.invalid> wrote in message > news:hv5h5n$h77$1(a)news.eternal-september.org... > >> How are you planning to handle the cold junction compensation? > > A temperature sensor at the connection point. > > Are you looking for a off-the-shelf solution, or your own design ? I have used these parts for each channel ( four channel design): http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3149 http://www.analog.com/static/imported-files/data_sheets/ADuM1400_1401_1402.pdf With a PIC and and LCD display. hamilton
From: hamilton on 14 Jun 2010 12:53
On 6/14/2010 10:06 AM, hamilton wrote: > On 6/14/2010 9:29 AM, John Smith wrote: >> "Tauno Voipio"<tauno.voipio(a)notused.fi.invalid> wrote in message >> news:hv5h5n$h77$1(a)news.eternal-september.org... >> >>> How are you planning to handle the cold junction compensation? >> >> A temperature sensor at the connection point. >> >> > Are you looking for a off-the-shelf solution, or your own design ? > > I have used these parts for each channel ( four channel design): > http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3149 > http://www.analog.com/static/imported-files/data_sheets/ADuM1400_1401_1402.pdf > > > With a PIC and and LCD display. > > hamilton And four of these as well: NMF0505SC http://www.murata-ps.com/data/power/ncl/kdc_nmf.pdf hamilton |