2. interesting observation: turning the unit 90 degrees onto its right
hand side immediately increases the output frequency by 10 mHz (reversible);
turning the unit 90 degrees onto its left end immediately decreases the
output frequency by 10 mHz (also reversible)
This meant that the g-sensitivity is in the order of magnitude of 1 ppb/g
which is quite a normal order of magnitude.
Correctly doing the 2g-flipover would tilt the OCXO by 180° an divide the
observed relative frequency change by 2.
But also this simple test is not necessarily an accurate measure of the
g-sensitivity. As the extremes may now occur at 180° tilt.
Also care has to be taken to distinguish between the frequency shift caused
by the g-sensitivity and a frequency drift (usually slower) by thermal
effects, as the internal temperature profile is also reversing.
Have fun
Bernd DK1AG
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