On Tue, Sep 6, 2016 at 4:24 AM, Bob Darlington <rdarling...@gmail.com> wrote:
> Rick, > > I'm going from memory here. My former business partner (now deceased) had > a "beer fridge" setup as an environmental chamber for our instruments. The > trick for stability was to run the AC compressor all the time, and push > against it with heat lamps. I had a commercial environmental chamber : it did exactly this. The fridge unit could be controlled from an auxiliary output of the PID controller but the basic principle was to heat from ambient, or heat against the fridge for lower temperatures. Maybe Peltier systems can have a cleaner rollover for cooling, but gas-based coolers have far too much settling time / transients / hysteresis to be actively in the control loop. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
