At JeffK's suggestion, since the microseism has been coming down, we've transitioned back to our nominal WINDY seismic configuration. However, the CPS DIFF is still off, since the microseism BLRMS is still above ~0.04 um/sec. That seems to be about the level at which we started seeing glitches in Omicron.
So, if the microseism BLRMS is above 0.04 um/s (the units of the channels when viewed in ndscope is nm/s, so the value will be 400 nm/sec in ndscope for channels such as H1:ISI-GND_STS_ITMY_Z_BLRMS_100M_300M), let's keep CPS DIFF off. If we go below that level, we can turn back on the CPS DIFF by setting
H1:ISI-DIFF_CONTROL_BIT to 1, or by opening the SEI DIFF controls screen and clicking ON in the lower righthand corner. To get to that screen:
- Sitemap
- SEI button
- Choose ISI Sensor Config
- Yellow button labeled "ISI DIFF" near the top of the screen
- Choose Output Limiters
- On/Off button has the word "master" written next to it in the lower right corner.
- There is a box around the On/Off button. If it is grey, then you will see that all of the numbers on the far right side of the screen are zero, and the system is off. If it is green, then you will see that there are nonzero numbers going to the ISI platforms and the system is on.