TRG vs GPS Statistics of June 2003 run

Note: Rubidium clock installed 6/9/2003 as 50.0 MHz precision reference for LTC

Plots of data from 06-09-2003 05:22:58 to 06-23-2003 15:58:58


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


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


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

Histograms

Note: y axis is log scale

Notes

(*1)   A rubidium clock was installed 6/9/2003 as 50.0 MHz precision reference clock for both, the Local Time Clock (LTC) and the TRG module. It is PLL-synchronized to the 1PPS signal of the backup GPS receiver (GPS2: Motorola).
(*2)   GPS2 is now based on the 1PPS output of the rubidium clock, which is basically low-pass filtered from the original 1PPS signal of the backup GPS receiver. The expected error between GPS1 and GPS2 is approx. 20 nsec rms or better and +/-100 nsec worst case, even with loss of satellite lock for several minutes.

See also list of errors.