Last night, we got about 8 hours at 4001.3 Hz (roughly 8 PM to 4 AM local time)

We then shifted to 2501.3 Hz at approximately 4 AM local time and got about 6 hours in this configuration before JeffK just switched to 2001.3 Hz..

 

Here is a  proposal for frequencies and excitation times, all assuming we are driving the Pcal at close to full range (35,000 - 40,000 counts, in this case)

Note that the S/N ratio in DeltaL_external will scale as approximately the inverse of the cube of the frequency.

Also note that for each frequency one should scrutinize the DeltaL spectrum to ensure there are no features within a few Hz of the excitation frequency, in which case the excitaiton frequency could be adjusted.

 

1001.3* Hz    1 hour

1501.3 Hz     1 hour

2001.3 Hz     1 hour

2501.3 Hz     2 hours

3001.3* Hz    4 hours 

3501.3 Hz     6 hours

4001.3 Hz     8 hours

4501.3 Hz     12 hours

 

Note that we already have data near this frequency, so this should be saved until the end, if time allows.

 

I suggest we run through the lower frequencies (and shorter times) during the days when calibration folks are around to make the changes, then leave the higher frequencies for the evenings with instructions for the operator to make the changes after enough good locked data is obtained.