(MM) wild temp sensor readings


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JohnS
Guru

Joined: 18/11/2011
Location: United Kingdom
Posts: 2503
Posted: 11:30pm 13 Jan 2012      

The ratio of R2 & R3 will only move the readings a little if you measure the resistors carefully. Worth doing, but it's not going to fix the problem where the temp jumps.

I can't see changing R1 by a little being a fix, either.

You have noise spikes or something (by way of example, a heat source you've not realised is there).

The filters & noise suppression shown in the above circuit and mentioned in various posts are to get rid of (suppress) the noise - if it's noise, and likely it is.

John