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    User name brads

    Log entry time 13:44:37 on December 16, 2008

    Entry number 253622

    keyword=3" PMT in Cerenkov witness box has insulation added

    I wrapped another layer of electrical insulation around the 3" PMT in Cerenkov witness box. It worked fine last week, but when I tried to bring it up to voltage (-1450V) yesterday it suddenly generated a DC offset on the signal output at around -1200V. Either the PMT started to discharge through its housing or the base is wonky... Time will tell.

    A copy of this log entry has been emailed to: meziani