------------------------------------------------------------ Date: Wed Sep 5 16:03:20 2001, Shift: 08:00-16:00 Supervisor: K. Hagel, with: Log book#8 pages 79 - 80 Shift Summary: ------------------------------------------------------------ No beam during entire shift. Toward end of shift, machine was at injection; then a power supply problem. Spent a lot of time with DB/FV working on ZDCs. 1. Changed one BNC-LEMO converter on left 1 which was injecting noise into both it's signal as well as the sum signal 2. Changed two filters as they were of an obviously different vintage than the ones fabricated for the ZDCs. This eliminated an overshoot problem (at least with the ZDC LED) and made the analog sum agree much closer with the digital sum. Currently analog Sum/digital Sum Left = .85 analog Sum/digital Sum Right = .94 For the left, the ratio of .85 is up from .4 before we started the diagnosis 3. Tried to change the pedestal in right 1. I tried many iterations with the ADC on the CAMAC extender, but I could never make a pedestal appear. Conclude that pedestal adjustment of chan 4 of the ADC does not work. The LED signal comes in OK, however. ------------------------------------------------------------
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