[time-nuts] Temperature sensors and bridge amps

Magnus Danielson magnus at rubidium.dyndns.org
Sat Nov 13 16:35:34 UTC 2010


On 11/13/2010 04:48 PM, Richard Karlquist wrote:
>   The HP E9183A achieved 1 millidegree over -55 to +85C
>   in a single oven.  The time lag was dealt with by adding
>   a double integrator to PID.

I'd assume you would intend to write HP E1938A, right?

Cheers,
Magnus

>   Rick Karlquist N6RK
>
>   On Fri 12/11/10 8:26 AM , "Bill Hawkins"  wrote:
>
>   in the heater control loop. Of course, you can't get to a
>   millidegree from ambient with just one oven. And you can't
>   eliminate time lags if you have any thermal mass.
>
>
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