Dealing with thermocouples - and building thermocoupls

[Rich M]

Yep, good idea.
I'm going to put flame suit on and ask a dim question now... can someone run
me through how to do that, in plain and simple terms please.
Cheers
Rich

> -----Original Message-----
> From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
> Behalf Of C. Brooks
> Sent: 16 June 2000 22:46
> To: diy_efi at diy-efi.org
> Subject: Re: Dealing with thermocouples - and building thermocoupls
>
>
> How about uploading it to the FTP site for future reference? Could use a
> descriptive name like "tc_amp" or some such...
>
> Charles Brooks
> Mid-Atlantic Speed Shop
> http://www.massmotorsports.com
>
>
> ----- Original Message -----
> From: Rich M <rsrich at cwcom.net>
> To: <diy_efi at diy-efi.org>
> Sent: Friday, June 16, 2000 5:33 PM
> Subject: RE: Dealing with thermocouples - and building thermocoupls
>
>
> > I've used a simple circuit to very good effect using the LM35 as a cold
> > junction compensator and a single good quality op-amp (Linear Technology
> > LTC1050) and a handful of passives to provide the gain.
> > One important consideration if you are doing your own op-amp
> circuit is to
> > ensure you use a good op-amp with very low input offset voltage (Vios)
> > specification. Consider that a 'K' type thermocouple generates a voltage
> to
> > the tune of 40 microvolts per degree centigrade, an input offset voltage
> > value which is significant with respect to this level can produce a
> > measureable error. The LTC1050 has a value of a handful of
> microvolts but
> > doesn't cost a packet (approx. 2.5UKP in small quantities). Anyone
> > interested is  welcome to a .pdf of the schematic if it's helpful.
> > As a side benefit, this circuit behaves predictably if the thermocouple
> > becomes disconnected; not designed that way, just happened!
> >
> > Rich
>
>
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