rahul.kumar@LIGO.ORG - posted 13:38, Thursday 13 August 2026 (91524)
Spare ZM5 (PSAMS - s/n 02) unit repaired with a new PZT - 65in-lb pre-load applied on the mirror.
Ryan C, Rahul
This unit will be shipped to CIT for ROC measurements on Zygo interferometer. This will then be return to LHO and stored in the desiccant cabinet as a spare ZM5 unit.
We removed the broken PZT and replaced it with a new one sent by Camille.
The strain gauge resistance was measured to be around 700 ohms and 360ohm and the PZT capacitance was around 20 uF.
Details - s/n 02, mirror pre-load value = 65 in-lb.