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User name R. Michaels
Log entry time 15:33:35 on April20,2009
Entry number 267203
Followups:
keyword=EDTM setup
The EDTM pulsing system was set up on the 2 HRS. On the L-HRS
the pulse is sent to BB via the cable with 2 labels: "EDTM" and
the other ~looks like "5". It was the cable Vince gave me.
The EDTM pulser comes out of the left-most module (slot 1), not
the master in slot 10. Why ? See below. Implication is a
~50 nsec delay relative to master.
On R-HRS the master is in slot 13. At the moment the rate is 2.5 Hz
on R-HRS and I cannot adjust this. Will investigate more later
when I have access (VDC installation in progress). I can, however,
prescale L-HRS rate. It's default is 3 Hz.
Modifications:
---------------
The code edtm.c and edmtser.c was modified to permit both arms
to have masters. The frontend script "edtmsetup" was modified
(see comments there).
Dirty Laundry:
--------------
The L-HRS master in slot 10 has 2 outputs, and one does not work.
If I "tee" off the working one, the slave doesn't work (amplitude
too low); therefore I send the pulser output from the slave;
hence that 50 nsec delay. I guess these modules are getting old.
We simply need to measure carefully all delay offsets relative
to the output on the front.
Side note: there was a coinc. module in the NIM bin below L-HRS TS
that had an output going to another module's output (illogical)
so I unplugged this. In case you were trying something ...