I have measured the transfer functions of the newly installed whitening chassis (alog 28010, ECR:E1600192, SN:S1101627) for the OMC DCPDs. I used LISO for fitting the data.

[1st stage for DCPD A]

Best parameter estimates:
pole0:f =  18.6776675365k +- 10.45 (0.0559%)
pole1:f =  14.3409807014k +- 6.292 (0.0439%)
pole2:f =  98.9444053052k +- 32.86 (0.0332%)
pole3:f =  10.3243596197 +- 359.4u (0.00348%)
zero0:f =  985.3423393170m +- 79.51u (0.00807%)
factor =  998.8350760502m +- 67.01u (0.00671%)

Final chi^2=0.00252952

[2nd stage for DCPD B]

Best parameter estimates:
pole0:f =  18.5698573085k +- 14.71 (0.0792%)
pole1:f =  14.6043378758k +- 9.31 (0.0637%)
pole2:f =  100.4496012696k +- 43.14 (0.0429%) > MAX
pole3:f =  10.0731025960 +- 470.5u (0.00467%)
zero0:f =  961.4535554217m +- 104.7u (0.0109%)
factor =  997.7425128879m +- 90.38u (0.00906%)

Final chi^2=0.00454374

[Small notes]

I have also measured the same transfer functions with a 4 times smaller excitation signal in order to check some sort of saturation-induced measurement error. I did not quantitatively look at these data, but plotting them on top of the above data showed excellent agreement (to my eyes).

[SVN info]

All the data, scripts and figures are checked into SVN at:

/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/H1/Scripts/OMCDCPDs

/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/H1/Measurements/OMCDCPDs/2016-06-30

/ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O2/H1/Results/OMCDCPDs