Reports until 15:13, Monday 03 December 2018
H1 CAL (CDS, DetChar)
jeffrey.kissel@LIGO.ORG - posted 15:13, Monday 03 December 2018 - last comment - 18:50, Monday 03 December 2018(45653)
H1 PCALX Temperature Sensors Broken
J Kissel, N. Lecoeuche

While glancing at the PCAL END station overview screens, we noticed that the PCALX screen words "STATUS" and "Pcal modules are not powered" were blinking rapidly. The channels that this status indicator are measuring are:
    "Pcal modules are not powered"
        H1:CAL-PCALX_LASERENABLE 
        H1:CAL-PCALX_LASERPOWERCONTROL 
        H1:CAL-PCALX_SHUTTERSTATUS  
        H1:CAL-PCALX_LASERDIODECURRENT
    "STATUS"
        H1:CAL-PCALX_TRANSMITTERMODULETEMPERATURE 
        H1:CAL-PCALX_RECEIVERMODULETEMPERATURE

While the "Pcal modules are not powered" channels are flat and unchanging -- and the same as PCALY -- we found that the "STATUS" channels, i.e. the temperature sensor channels, were reporting a wildly oscillating temperature from 0 to 20 deg Celsius, with a ~1 sec period. 

This junk has apparently been happening since Sunday Nov 11 2018 (~a month ago) at 23:38:56 UTC (Nov 11 2018 15:38:56 PST).

Attached are screenshots of when the failure happened, and how the sensor outputs currently look.
Images attached to this report
Comments related to this report
yannick.lecoeuche@LIGO.ORG - 15:26, Monday 03 December 2018 (45655)

Opened FRS-11921

richard.mccarthy@LIGO.ORG - 18:50, Monday 03 December 2018 (45666)

This is a known issue.  The parts have been ordered to fix this.  I will mark FRS as duplicate.  It is in the chassis not the readback chain.

https://services.ligo-la.caltech.edu/FRS/show_bug.cgi?id=10987