Related alog: 27349

I have coarsely adjusted the demodulation phases for the 331.9 Hz calibration line in CAL CS. Now the CAL CS model returns a live cavity pole value in unit of Hz. The first attachment shows the current filter settings. The second attachment shows where to look for getting the live cavity pole value. This screen is linked from CAL_CS_OVERVIEW.adl; clicking a pink box in the upper left takes you to the screen shown in the second attachment. I have adjusted the demod phase of the Pcal line to get the cavity pole between 340 and 360 Hz. Also, I set the demod phase of the DARM error demodulation to 180 deg so that the imaginary part of  the calculation is negative. We still need to do a careful measurement of the cavity pole with the usual swept sine to make the live value more accurate, but for now this should be good enough for commissioning purpose. I believe that the current accuracy of the live cavity pole frequency is about 10%.

Additionally, I have bumped up the excitation amplitude of the 331.9 Hz Pcal line by approximately a factor of 10 for obtaining a high SNR. I will leave the excitation amplitude as it is.