[hpsdr] thermocouples

[peter at gehughes.us]

Who better to answer your query than Omega...


http://www.omega.com/temperature/Z/pdf/z021-032.pdf

N7BMG

> -------- Original Message --------
> Subject: Re: [hpsdr] thermocouples
> From: "Lawrence Stoskopf" <stoskopf at tri.net>
> Date: Mon, August 21, 2006 10:58 am
> To: hpsdr at hpsdr.org
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> I never was sure how the professionals treat the measuring end of the 
> thermocouple.  I just twist and hit with a hammer.  Not sure how reliable 
> that is. 
> 
> As for the measuring instrument end:  the ones I've seen have connectors of 
> the same material, but somewhere there has to be a connection to copper. 
> 
> Comments, 
> 
> N0UU 
> 
> 
> > Thermocouples should never be soldered to (or even mechanically connected to)
> > copper wires.  That creates more thermocouple junctions that produce
> > unpredictable changes to the thermocouple's calibration factor.  The
> > thermocouple leads should be long enough to connect directly to the terminals of
> > the measurement instrument. 
> > 
> > Phil, K3IB
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