[time-nuts] Temperature sensors and bridge amps

Richard Karlquist richard at karlquist.com
Sat Nov 13 21:24:21 UTC 2010


 Yes, E1938A.  I was operating on limited sleep when I posted that.

 Rick

 On Sat 13/11/10 8:35 AM , Magnus Danielson  wrote:

 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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