Testing the North muTr chamber "pigtail" calibration connections - MJL - 11/3/01
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We will use the North calibration system to pulse the "calibration" anode wires
via the "pigtail" connections to the calibration and sigHV-return posts on the
chambers and observe the induced signals on the cathodes.

A small calibration system with one driver board has been set up in a small
portable VME crate. Signals from a driver card come out on short patch
panel cables to the patch panel where they continue on a long calibration cable
to a connection with the pigtail and chamber to be tested. The long cable is
about 70 feet long and just barely reaches the station-3 chamber near the end
of the clean tent. The calibration system sends a square pulse about 12 microseconds
in length with an amplitude up to 10 volts or so.

The calibration system is configured via its arcnet connection using Andrew's
arcnet control program (an icon on the desktop) on the Windows PC. Calibration is
accessed through the "l" option in the menu. To configure the calibration system
from scratch (e.g. when it has been powered off) one would "clear", "set defaults",
"set dac" and then "set all drivers". Since the calibration system is presently the
only thing on arcnet the broadcase address of "0" can be used. A hex value of 80
can be used for the "set dac" and a hex value of ffff can be used for "set all drivers".
Once this is done one should see all the green led's on the driver card on.

The trigger for the calibration system comes from the GTM using one of the mode
bit files with "CALI" in the name. To start the GTM GUI contronl go to the LINUX
PC and log into phnxmutr, then "cd test" and "go_gtm". This should raise a GUI
for GTM control. Load the calibration mode bit file, do a "scheduler reset" and
a "start", then a "glink reset". Once this is done then the fiber from the GTM
into the calibration system should be triggering the system. You should see the
top "trigger" led on the calibraton glink module flashing as it triggers.