TRG vs GPS Statistics of Mar 2000 run

Relative time between spills (via TRG 48-bit clock)

same as above, but zoomed in [2.17 ... 2.21] and with histogram

TRG oscillator drift from 50 MHz (*1)

Absolute spill time difference between GPS1 and GPS2 (*3)

Relative spill time difference between GPS1 and TRG (*2)

Relative spill time difference between GPS2 and TRG (*2)

Note: y axis is log scale

(1)*	Both, the TRG module and LTC module each use an internal, free-running 50 MHz crystal oscillator (independent) for their clock counters. The two oscillators are not temperature compensated! Therefore, any change of the room temperature in the North Hall control room causes them to drift. Cooler temperatures usually result in higher frquencies than at warmer temperatures.
(2)*	Absolute TRG clock vs. GPS time measurements cannot be made due to the mentioned temperature-dependent TRG oscillator drifts, as shown in the wave forms of the plots above. The waves are inverse proportional to temperature changes in the North Hall.
(3)*	On March 1, 2000, between 00:00 and 06:33 (UTC), the GPS2 data shifted back by 1 full day (86400 seconds) due to a Y2K error in a time/date conversion subroutine. The bug was fixed at 3/1 06:33 (UTC). The bug affected only GPS2. GPS1 was ok during the entire run period!