Main INDEX
Monthly INDEX
PREV
NEXT
User name R. Michaels
Log entry time 12:08:20 on September 03, 2008
Entry number 242822
keyword=L-HRS scalers ready (but waiting for target state)
L-HRS scalers for normalization are ready, except for the gating
signals which Kalyan will send me soon.
They are run as 3800 mode. There are 5 scalers as we discussed:
1) ungated, 2) gated by ++, 3) +-, 4) --, 5) -+
where the two signs are for beam and target state.
One problem: sometimes a scaler goes "bad". When it goes bad
it reads back -1 for all channels. I've seen 2 diff scalers go bad
like that, so far. The solution is to power cycle the crate.
I don't know how often they go bad but this is a worrry.
Bob
A copy of this log entry has been emailed to: kalyan@jlab.org