h1susey reported a DAC error with both its LIGO-DACs at 17:32 Thursday 16apr2026 PDT. This was caused by a large timing glitch seen on h1iopsusey and h1susetmy at this time, cpu_max of >200uS were seen on both models. This was a recoverable error and DAC0 continues to drive.

The lights were not on at EY at this time, so it does not appear to be related to any in-rack work.

dmesg:

[Thu Apr 16 17:32:21 2026] h1iopsusey: ERROR - LIGO_28AO32(0) DAC error detected, 0x30070086, DAC error counter: 19, is_locked: 1
[Thu Apr 16 17:32:21 2026] h1iopsusey: ERROR - LIGO_28AO32(1) DAC error detected, 0x30070086, DAC error counter: 19, is_locked: 1