david.barker@LIGO.ORG - posted 16:16, Monday 08 July 2019 - last comment - 12:31, Wednesday 10 July 2019(50445)
EX CNS-II GPS receiver error
Daniel, Dave:
at 19:54 UTC (12:54 PDT) the CNS-II GPS receiver at EX went into an alarm state. Attached image shows EX status on lower left, with EY on lower right for comparison.
Daniel says that the 1PPS signal did momentarily glitch at the time the error was raised, but since then the signal is correct (see attachment). He does not know why the system is reporting 'waiting for lock', it detects and tracks the same number of satellites as EY. If the problem perists overnight, he suggests we power cycle this unit during Tue maintenance.
Images attached to this report
Comments related to this report
Power cycled Tue around 9am. The clock returned to its old configuration.
Power cycled Tue around 9am. The clock returned to its old configuration.
J. Kissel reporting for D. Sigg and D. Barker. Daniel notes a transient glitch in the 1PPS comparator signal and the IRIG-B, but these are just monitored channels. Their report was in error, and has no impact on the IFO. After that the output from the unit was nominal but with a stuck error which got cleared on reboot. This is just a "thing that can happen sometimes, though rare, and has no consequence? and thus has been determined to be NOT A FAULT and thus will not be reported in the FRS system.