peter.king@LIGO.ORG - posted 12:27, Friday 13 February 2015 - last comment - 17:04, Friday 13 February 2015(16719)
IO periscope PZT filter(s) installed
The piezo low-pass filter box (D1500001) S/N S1500001 was installed. Measured voltages at the 15-pin analog interface pin before after signal 1 0.110 0.016 V-MON-X 2 0.206 0.143 V-MON-Y 3 0.109 0.160 V-MON-1 4 0.206 0.143 V-MON-2 5 0.000 0.000 V-MON-3 6 0 4.664 Servo-1 OFF/ON 7 0 4.656 Servo-2 OFF/ON 8 GND 9 0.160 -0.476 SGS-MON-X 10 1.431 1.173 SGS-MON-Y 11 0.163 -0.472 SGS-MON-1 12 1.430 1.173 SGS-MON-2 13 -13.15 -13.12 SGS-MON-3 14 4.824 4.821 OFL1 15 4.821 4.819 OFL2 DIP switches 1 & 2 were switched from ON to OFF. To bring the beam back, most of the adjustment was done with the control slider for pitch, which went went a couple of hundreds on the slider to ~4000. The yaw slider was adjusted by a few hundred. Kiwamu, Richard, Peter
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What does changing the DIP switches from ON to OFF do? Are these for closed loop operation using the built-in strain gauge sensors? And if so, were they operating closed loop before, and are now open, or vice versa? (They should not have been operating closed loop, because the strain gauge sensors inject noise.)