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User name Jack
Log entry time 15:38:53 on August 24, 2009
Entry number 285707
keyword=Right Arm VDCs
The cable to pickoff the threshold on the top VDC was not fully seated.
While the threshold measured on the amplifier was 3.8V the measured value
at the ADC was about 2V and varying (just noise). I re-seated the
connector and things seem OK. Both the top and bottom VDC were running
off the same channel of the Bertan power supply. I believe this is
leftover from when the top VDC was having foil problems and tripping off.
Since the VDC has been replaced, I put each VDC back on a separate
channel. The top VDC is in channel A and the bottom VDC is in channel B.
The noise on the current readback seems to be about the same. I expect
this is from the Bertan supply itself. Swapping channels would be an easy
check at this point.