[time-nuts] Making a HP 10811 better

[Stanley Reynolds]

Is the source of the vibration important ? I'm thinking that any vibration that is not on the same axis as gravity. Walking across the lab vs a fan that is out of balance close by. Would a suspended mass mounting help with vibration isolation and damping with rubber pads and springs or would that just make a seismograph ?

Stanley


----- Original Message ----
From: Peter Vince <pvince at theiet.org>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>
Sent: Sat, March 27, 2010 10:51:07 AM
Subject: Re: [time-nuts] Making a HP 10811 better

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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