hugh.radkins@LIGO.ORG - posted 10:04, Wednesday 19 February 2014 - last comment - 10:15, Wednesday 19 February 2014(10172)
Using Dataviewer for frequency analysis--Beware
Not that this can't be operator error but see attached. Jim noticed a large output from the ITMX Stage2. 1000s of counts is of concern; 100s is normal. Anyway, looking at dataviewer of the fast channels, I thought this was ~8Hz; but the spectum and the DTT time series says this is 120Hz. Still looking for this peak source.
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OK Robert solved my problem--The Dataviewer by default comes up at 128 hz resolution and this 120Hz peak is very large. When I go to a higher 'resolution' in dataviewer it looks correct. User beware.