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User name Moffit
Log entry time 11:45:58 on August29,2005
Entry number 153747
keyword=Access activity, det1 pedestal noise
During the access, played with some the cabling arrangement for detector 1
(plugged into adc27_0).
I determined that the pedestal noise was not the result of the cavity monitor
signals, readout in the same crate.
The main source of the noise appeared to be from the fact that the signal cable
was coiled up. I uncoiled it, and it reduced from RMS of 20 channels down to
12 channels.
Also appears that we pick up an additional 2 channels of RMS by using the
switch. So... at present... we have about 13-14 channels of noise on the
detector 1 signal.
Looks like the pedestal also changed by 281 channels (which may or may not have
been from the reduction of pedestal noise).
Like before... I have changed the pedestal in the database file.
FIGURE 1