> > Someone commented a while back on the effect of gravity to a osc > as it rotated thru its 3D axis. > Attached, I've plotted the gravitational effects on the Freq of a > HP10811 osc > that has been placed in a box and tilted so that it is at its > null turnover G axis. > Plotted is the change in freq caused by sitting the box on each > of its 6 sides for about 30 seconds > and then rotating the box by hand (some what jittery) 360 deg in > two different axis. > The test was done mostly to test my Freq offset tester, but I > found the results interesting enough to post. > Max 2 G effect is 1.42 e-9. All numbers are calibrated raw > data, taken at > 1e-12 resolution with a 0.5 sec filter, updated at 50 samples per > minute. > The samples between 28,300 28,450 where referenced to a GPS locked Tbolt, > the rest of the plot was referenced to a second 10811 which has > about 1/10 of the > Tbolt's short term PP noise, visible only in the expanded graph at zero.
That's about what I saw when I turned my 5061A over on the workbench (attached). The large spikes are 90-degree turns starting from the normal upright position, first to one side and then to the upside-down position, allowing 2-3 minutes or the loop to recover each time. The third spike is a quick turnover back to upright. The 10811-60109 oscillator is mounted with its top surface facing the front panel. -- john, KE5FX
<<attachment: turnover.gif>>
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