I made a DC calibration of IMC WFS A and B using an Ophir power meter and the IMC reflection beam.  Both give about 1100 ct/W.

Details:
* Both PDs had been left unplugged at the rack and their interface chassis was switched off.  So I connected the cables, powered them up and then centered them manually looking at the DC settings screens.
* Both gain switches on the front panel of the interface chassis were set to "LOW".
* There is currently a small ghost beam headed toward WFS A (appears to be created by its pickoff mirror).  I dumped that beam on a card for this measurement.

Data:
WFS A, measured input power 1.4 mW

 controls@opsws6:~ 0$ tdsavg 15 H1:IMC-WFS_A_DC_SUM_IN1 H1:IMC-WFS_A_DC_SEG1_IN1 H1:IMC-WFS_A_DC_SEG2_IN1 H1:IMC-WFS_A_DC_SEG3_IN1 H1:IMC-WFS_A_DC_SEG4_IN1
 1553.5
 -438.585
 -353.511
 -350.708
 -410.694

WFS B, measured input power 3.0 mW

 controls@opsws6:~ 0$ tdsavg 15 H1:IMC-WFS_B_DC_SUM_IN1 H1:IMC-WFS_B_DC_SEG1_IN1 H1:IMC-WFS_B_DC_SEG2_IN1 H1:IMC-WFS_B_DC_SEG3_IN1 H1:IMC-WFS_B_DC_SEG4_IN1
 3507.9
 -1087.05
 -721.106
 -913.896
 -785.855