I should of also said; when care is taken, turning the Osc unit over is
repeatable,
If just looking at a graph plot where the resolution is several parts in
e-11.
ws
******************
Pete2
Addressing your first question only, I'll let the experts address the why.
Yes, I 'think' it does in principal, I would not guess on how long it
takes though.
But
I have not checked that close to be sure.
I'd never do something that gross during the middle of a test that I was
trying to see 1e-12 things.
I do that first thing, long before the high resolution test starts and
then let things resettle before proceeding.
Any change in cable position or the Osc moving a bit in its Box or a dozen
other things could also change it that much, including temp gradients in
the box, so Don't do that if you want 1e-12 results.
Use the wedge, that I have tested, and is completely reversible and
repeatable at those levels.
I have noticed that the OSC will even take a long time to resettle
(hrs+ ) if the EFC voltage is change a lot and then put back.
Which is why I limit the clamp voltage of my Tbolt to typ + - 100 mv or
less from its nominal.
ws
********************
Warren,
If you turn over an oscillator, is the frequency change
completely reversible (to your "under 1e-12 resolution") when it is
restored? Thinking aloud, if an hour-glass is turned over twice, the
final level will be the same, but the grains will be mixed. A quartz
crystal, however, is solid, so hopefully nothing actually moves.
Presumably the zero-G axis is with the axis of oscillation at 90
degrees to gravity?
Peter (the "other" one :-)
***************************>
Another thing I use it for is to test high resolution Freq meters.
Using a calibrated wedge that I can then slide under one edge of the
zero-G
Osc box, I can
make small, variable, repeatable, freq changes of under 1e-12
resolution,
something pretty hard to do otherwise.
If I want to make BIG changes like 1e-10, I can rotate the box on any of
its
sides and still use the wedge,
and for a quick check of new equipment, I just turn the box over which
then
gives a couple of parts in 1e-9 freq change.
It makes a weird but simple and indispensable variable freq source that
is
useful for many things, such as checking the LOOP TC of a TBolt.
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