Virgo Logbook

Reports 1-1 of 1

AdV-DAQ (Data Acquisition and Global Control)

masserot, goauty, letendre - 22:12 Monday 21 January 2019 (44466)

SIB2 DBOX timing error drift on 20190117-18h40UTC

According the logbook 44429, the SIB2 bench was opened to install some attenuators of the quadrant DC channels .

During this intervention one can observed a drift only on all the SIB2 DBoxes timing error channels:

SIB2_DBOX_RightDown_timimg_error: +200ns
SIB2_DBOX_RightUp_timing_error: +60ns
SIB2_DBOX_LeftDown_timing_error: +30ns
SIB2_DBOX_LeftUp_timing_error: +30ns

The RFC and B2 demodulation mezzanines are in the SIB2_DBOX_RightDown DBOX . The 200ns jump could explain the B2 and RFC phase tuning needed to re-lock the ITF

Nervertheless, the causes of these jumps are not yet understood

Images attached to this report

44466_20190121220754_sib2dboxtimingerrordrift2019011718h40utc.png

Comments to this report:

masserot, letendre - 15:02 Tuesday 22 January 2019 (44480)

The SIB2 data sent to the SSFS start to be delivered too late at the SSFS mezzanine level in the same period (see plot)

Images attached to this comment