Reports until 15:45, Friday 10 October 2014
H1 SEI (CDS, DetChar)
krishna.venkateswara@LIGO.ORG - posted 15:45, Friday 10 October 2014 - last comment - 16:19, Friday 10 October 2014(14409)
H1 BRS calibration changed

J. Kissel, K. Venkateswara

We realized we had the wrong factor of 1/2 as described in alog entry 13448.  1/2 [V_sing / V_diff] was not needed/

The filters have been changed to account for the new calibration factor which is:

3.5e-6 [rad/pixel] * 1 [pixels/V_sing] * 1/2 [V_sing / V_diff] * 40/2^16 [V_diff/ct] * 1e9 [nrad/rad] =  2.1362 [nrad/ct]

 

Comments related to this report
jeffrey.kissel@LIGO.ORG - 16:19, Friday 10 October 2014 (14410)PEM
Link 

J. Kissel, K. Venkateswara,

Krishna copied, pasted, and posted too fast and still included my erroneous single-ended to differential conversion in the piece-by-piece equation, even though the answer quoted is correct. 
The calculation to achieve the correct calibration is
3.5e-6 [rad/pixel] * 1 [pixels/V_sing] * 40/2^16 [V_diff/ct] * 1e9 [nrad/rad] =  2.1362 [nrad/ct]

Also, I've committed the updated filter file to the userapps repo.

Also, also, we need to
(a) Add the reference mirror filter bank and damping motor control signal* to the MEDM screen
(b) Capture a new safe.snap with the reference mirror calibration filter turned ON as it is now.

*The damping motor control signal isn't yet present in the user model, it's only available as a raw IOP test point. We should add this to the h1isietmx user model when we're making the front-end code modifications to create the tilt-free ground super sensor. I'll post this as a comment to the other suggested model changes so we don't forget.