access activity (pvdis work)

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User name Ramesh/Xiaoyan

Log entry time 18:12:35 on September 10, 2009

Entry number 289004

keyword=access activity (pvdis work)

Checked both left and right HRS pvdis setup Dx10 signals. They look like
other BCM signals. In left HRS, all BCM signals (including UNSER) are now
perfectly digital (no attenuation any more) since they are re-routed from
755 modules instead of a LeCroy level translator.

We also found that in the right HRS pvdis low threshold discriminator,
almost no channels gave clock output. Found that a too low threshold was
the culprit. When set the threshold as -25 mV, we saw expected output of
an input. Now the thresholds of low to high threshold discriminator are
like this:
low: -25 mV
medium: -30 mV
hig: -105 mV

Checked left HRS TDC signals on the scope. All pulser signals are exactly
750 ns earlier than the common stop (also provided by the pulser trigger)
signal. Looks normal.