[time-nuts] Re: 10811 behavior - addendum

[djl]

Bob:  I've forgotten, if I ever knew, whether the oven(s) on these 
devices are bang-bang controllers or linear controllers?
Don

On 2023-02-28 06:41, Bob Camp via time-nuts wrote:
> Hi
> 
> Since the others have chimed in on beat notes, I’ll poke at the power 
> supply
> stuff.
> 
> One really fun aspect of an oven controller is that it can indeed cycle 
> without
> the power supply being defective. Put a dozen or so parts on a test 
> fixture and
> feed them through a skinny piece of wire. You likely will get them all 
> cycling.
> 
> The gotcha is that a defective contact can do pretty much the same 
> thing as
> that skinny wire. A failure of a component in the controller that
> boosts it’s gain
> also can put it into the same sort of cycling.
> 
> Spotting this is pretty easy. Look at the current meter on the power 
> supply.
> It will be cycling as the ovens do their thing. If it isn’t, cross
> this off the list.
> 
> No, this would not be my first guess, still it is a possibility.
> 
> Bob
> 
>> On Feb 27, 2023, at 11:14 PM, Skip Withrow via time-nuts 
>> <time-nuts at lists.febo.com> wrote:
>> 
>> I just noticed that the ripples in the phase plots are the slow cycle 
>> at
>> about 1/10Hz.  Also, I'm pretty sure the power supplies are not the 
>> problem
>> as the frequency of the ripples between the two 10811 units are 
>> slightly
>> different.
>> Skip Withrow
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