Relative Skew Measurements from
IceCube Temporary Counting House
Jan 13, 2005

At the time these screen snaps were made, only seven of the nine DOM Hubs were filled with their complement of 8 DOR Rev 0 cards.

The oscilloscope has a persistance behavior, combined with the jitter of the signals, accounts for the width of each colored line.
The 10 MHz cables were carefully trimmed ('tuned') to produce sub-nanosecond skew at all DSB cards.
.
The 1 Hz skew table below implies that care was also taken to 'tune' those cables, since, relative to a common reference, all waveforms fall within a window only about 1ns wide..

With a small leap of faith, combined with the 1 Hz to 10 MHz offset measurement in the bottom table, it is asserted that the 1Hz edges all fall within a window about 2ns wide.

Better timing 10MHz measurements were made a few days after these, along with a definitive 1 Hz to 10 MHz offset measurement.

10 MHz Relative timing for DOM Hubs in Rack 1, next to the Patch Panel
ithub0-to- ichub0-to- ichub1-to- ichub2
ichub2-to- ichub3-to- ichub4-to- ichub5

1 Hz Relative timing for DOM Hubs in Rack 1, next to the Patch Panel
ithub0-to- ichub0-to- ichub1-to- ichub2
ichub2-to- ichub3-to- ichub4-to- ichub5

1 Hz Relative timing for DOM Hubs in Rack 1, next to the Patch Panel

Relative Skew Measurements from IceCube Temporary Counting House Jan 13, 2005

Relative Skew Measurements from
IceCube Temporary Counting House
Jan 13, 2005