Trigger Timing Relative to S2

Triggertiming relative to the the time of the beam crossing S2. These times are taken from notebooks 2 and 3 of the 1994 data run.

The zero time is defined as the time of the beam crossing the beam counter S2. The cable from S2 to the patch panel is RG62 (93 ohm), 24 feet long. This produces a delay of 29 ns. The transit time in the photomultiplier is estimated to be 30 ns, therefore, patch panel time = 60 ns in this system.

The S2 patch panel is in rack 4; the discriminator is located at 8-1-7-4 (rack-crate-unit-subunit) 16 ns away.

signal			time (ns)
			5/3/94 data
beam crosses S2		0
S2 at FT rack 4 panel	60
pretrigger at panel	240
pretrigger fanout	280
beam pwc input to 
   to stobe fanout	300
    at pwc A4 input	325
strobe TPX mlu (4616)	690
strobe level_1		790
clockstop at MDM	825 (760?)
strobe 4508 prescale	890
level_1 out at spy	855
level_1 429 output	940
level_1 disc output	980
beam.dt disc output	245
tpx1 gate		470
tpx2 gate		477
tpx3 gate		493
level_2 strobe		10 us
tdc stop		11.78 us

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