[time-nuts] Making a HP 10811 and similar types better in the real world Part I
lists at rtty.us
Wed Sep 21 22:50:09 UTC 2011
Actually, overshoot is pretty easy to eliminate on a conventional OCXO by picking a good location for the thermistor. The heater will always run "hot", but the rest of the stuff does not have to.
On Sep 21, 2011, at 6:37 PM, Magnus Danielson wrote:
> On 09/22/2011 12:30 AM, Chuck Harris wrote:
>> Perry Sandeen wrote:
>>> GM List,
>>> ovens are proportionally controlled. On start-up all ovens,
>>> proportional or not,
>>> will have over-shoot. Some more, some less. An inescapable fact of life.
>> Imagine that the set point is variable, and can be set below the desired
>> temperature. Then imagine that the set point can approach the desired
>> temperature more closely as it gets closer to the desired temperature.
>> ... And you will have discovered (100 years late) the PID controller.
>> PID controllers do not have to overshoot the desired temperature. It is
>> not an inescapable fact of life. 30 years ago I was designing PID
>> with a little microprocessor magic, that could quickly arrive at the set
>> temperature and never, I repeat, never, exceed that temperature. Someone's
>> internal organs would have become toast if it did.
> Overshot is fairly easy to avoid for a well controlled PID loop simply by setting the damping factor properly.
> PIDs is nice in that you can control loop bandwidth and damping factor fairly well. Overshot properties vs. damping factor is a well researched field and already tabulated before I was born.
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