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User name Jack
Log entry time 19:48:10 on May 09, 2007
Entry number 201512
keyword=Replaced high voltage card for Arc PMTs during access earlier
The second channel of the 1461N high voltage card was bad. I replaced the
card. The Arc photomultipliers came up to their nominal voltages. This is
not the first time that channel has been killed. I suspect that people
are not turning the voltage to zero before unplugging and plugging in the
high voltage cable. This has been known to do bad things to the high
voltage supplies.