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User name R. Michaels
Log entry time 11:50:04 on June28,2010
Entry number 328910
This entry is a followup to: 328900
keyword=spot++ fixed (gate polarity was wrong)
I found that the ADC gate cable for ROC4 slot 24 was reversed.
Note, the blue LeCroy NIM/ECL fanout is different from the
NIM/ECL fanouts that Bogdan and his students use. Beware !
If polarity is wrong, you are integrating "forever" = saturation.
Of course it would be better if spot gave a more sensible error
message about this.
Now I can almost guess what happened last night. There was access
around midnight and work was done on PiR on ROC4 slot 23 (adjacent
slot). So they probably knocked out the gate cable and did a few
test runs like 1261 and realized they got no data, then restored
the cable, but put it upside down. Just a guess.
A peculiarity of slot 24 is that the slave light (S) never comes
on, but that is more likely to be bad LED. I ran the standard
Fastbus test codes: slot 24 is ok.
Here are typical data from run 1293 just now. Pedestals are normal.
Left HRS spot++ raw data 0 1466
Left HRS spot++ raw data 1 1397
Left HRS spot++ raw data 2 1417
Left HRS spot++ raw data 3 1524
Left HRS spot++ raw data 4 1384
Left HRS spot++ raw data 5 1535
Left HRS spot++ raw data 6 1424
Left HRS spot++ raw data 7 1514
Left HRS spot++ raw data 8 2179
Left HRS spot++ raw data 9 2495