Hi If that's the result you are getting, you are measuring something other than G sensitivity. Temperature effects possibly.
Bob On Mar 27, 2010, at 11:02 PM, WarrenS wrote: > > Just a friendly comment about the Zero G turn over point and Vibration > > Like Zero temp turn over, Special orientation of the OSC ONLY works good over > a VERY SMALL range, (maybe a 1/100 of G change) > It would not help vibration and has no effect on microphonics which are > likely a bigger problem anyway. > Try taping you Osc, It's freq will go crazy if monitoring it at high > resolutions and bandwidths > > ws > > ************************ > > Hi > > The concrete basement floor is your friend. > > Stay as far away from the blower on the furnace as you can. If you have a > drop forge in the basement avoid it as well :).... > > You will indeed have a seismograph, but not a very useful one. There's not a > lot of G's at seismic frequencies unless you live in an active earthquake > region. The fundamentals of G's and displacement vs frequency are in your > favor in that respect. > > Bob > > > On Mar 27, 2010, at 12:42 PM, Stanley Reynolds wrote: > >> 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 <[email protected]> >> To: Discussion of precise time and frequency measurement <[email protected]> >> 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. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
