daniel.sigg@LIGO.ORG - posted 16:31, Tuesday 16 January 2018 - last comment - 11:30, Wednesday 17 January 2018(40141)
RF readbacks
Some strange readbacks in ASC-AS_B_RF42_DEMOD_LOMONCHANNLE_3/4 and LSC-REFLAIR_A_RF45_DEMOD_RFMON.
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ASC-AS_B_RF42_DEMOD_LOMONCHANNEL_3/4
We traced the issue to the beckhoff terminal in H1 EtherCAT Corner 4, Slot 9 (H1 Demod M) Channel 4B looks like it has an offset and is possibly a bad terminal.
LSC-REFLAIR_A_RF45_DEMOD_RFMON
We found a 46MHz oscillation on this signal. Daniel power cycled the LSC RFPD Interface (S1200460) and the oscillation went away.
H1 SQZ 42.375MHz
This signal is good but the power ok bit is not being read. I verified that the OK bit is active, but the Beckhoff terminal is not receiving it. Will replace terminal next maintenance day. Corner 6 Slot 3, RF Amp 7.