The PZT actuation on the laser frequency in MHz/V ( assuming the previous calibration here of the PZT count/V) is :
X- arm: 33.7 MHz/V
Y- arm: 14.59 MHz/V
This number seems to be wrong by a factor of 10.
So we[I and EricQ] decided to trace the cables that run into the ADC from the PZT Out. We found a black LEMO box in the path to ADC,which is an anti-aliasing filter for each input channel. However,in theory the response of this filter should be flat up until a few kHz i.e. for the DC gain it should be 1. But we will manually test it and look at the DC gain of the LEMO box.