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I'm not seeing that on mine with the same control circuit - I'm wondering if sloppy response of the RTD in a block that is rapidly changing temperature is causing the variation in temperature you are seeing. I'm measuring the temperature on the end (surface) of the cold finger but controlling the temperature inside the larger block of aluminium behind the cold finger. Also I've encased the RTD in heatshrink and used thermal transfer paste in the hole the RTD is inserted into.
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