[time-nuts] How to accurately measure an oscillator's temperature.

Didier Juges shalimr9 at gmail.com
Fri Apr 25 11:14:03 EDT 2014

The best way is to place the temperature sensor near the part or parts that are the most temperature sensitive. When dealing with something that is already in an oven, that may not be so easy.

Didier KO4BB

On April 23, 2014 9:37:29 PM CDT, Chris Albertson <albertson.chris at gmail.com> wrote:
>I have both an OCXO and an FE-5680 Rb oscillator and I'd like to track
>their temperatures.
>What is the best why to measure?   Maybe each has a different best
>The OCXO is just a small steel can.  Is measuring the steel can
>the best why to go.  Epoxy some kind of sensor to it?
>The Rb is mounded to a large heat sink and there is a fan.  I want to
>control the fan so as to keep the Rb temperature constant.
>In both cases I tried using TMP36 three terminal sensors and just got
>noise.  The reported temperature was up and down more than 2C.    The
>controller just chases noise.
>BTW the fan based temperature control is effective.  The FE5680 gets
>warm in it's box but if I give the 12V fan even 8 volts the heat sink
>quickly cools.  I want to throttle the fan to keep the Rb at constant
>temperature but the temperature data I'm getting is not very good.
>The problem I think is that any sensor I have is on the outside of the
>oscillator and is effected by cooling air   What are others doing?  
>the best kind of sensor.
>Chris Albertson
>Redondo Beach, California
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