peter.king@LIGO.ORG - posted 06:32, Wednesday 13 June 2018 - last comment - 06:39, Wednesday 13 June 2018(42492)
TTFSS transient signals (part 1)
tek00000.png shows the fastm signal (yellow) and pcm signal (cyan) as given from the TTFSS field box.
It was noticed that the pcm signal never crossed zero and always had a slightly saw tooth appearance
to it. The same two signals taken from the TTFSS board (TP10 and TP9 respectively) are shown in
scope_11.png. Clearly the pcm signal from the field box is broken. Either the differential amplifier
(N14) or the differential-to-single ended amplifier (N15) is faulty.
More to follow.
Rick / Peter
Images attached to this report
Comments related to this report
The PCM signal from the field box and recorded by the DAQ is an rms value. So, it will never be negative.