Reports until 08:23, Tuesday 14 July 2015
H1 ISC (AOS, ISC)
sudarshan.karki@LIGO.ORG - posted 08:23, Tuesday 14 July 2015 - last comment - 12:00, Monday 25 January 2016(19617)
ISS Outer Loop Servo Modification

Kiwamu, Sudarshan

ISS Outer Loop Servo Board (S1400214) was modified to include a zero at 100 Hz to obtain a better phase margin. This was done by replacing a resistor R74 from 0 Ohm to 154 Ohm (D1300439) and has been documneted in the E-traveler. 

Initial test has been done after the modification and the board will be installed today during the maintenanace period. Further performance test will be done after the installation and with loop closed.

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sudarshan.karki@LIGO.ORG - 12:00, Monday 25 January 2016 (25142)
Link

The second loop transfer function measurement was taken after the modifications were done. The plot and data is attached.

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