MIT Menlo Sub-Hz Optical Reference DVIA-T45 (211206R5-4) Inspection Report
Contents
Overview
An inspection was requested because DVIA-T45 performance was judged to be problematic.
A prior remote session was attempted; the RS-232 cable held by MIT was incompatible with DVIA-T, so an in-house cable was shipped and remote support was retried.
Vibration Isolation System Information
Model: DVIA-T45 (150kg)
Serial Number: 211206R5-4
Engineer
Youngha Lee from DAEIL SYSTEMS
Tuning Date
February 07, 2023
Number of Tuning Trial
First time
Location
Room 26-340, MIT, 32 Vassar St Cambridge, the 3rd floor.
Equipment
Model: Menlo sub-Hz linewidth optical reference system
Weight: about 85kg
Equipment Condition
Equipment is installed, Idle
Prepared for
MIT
Prepared by
Engineer: Youngha Lee
Tuning date: 24.02.07
Report written date: 24.02.07.
Data and Image
Conclusion
On the initial inspection, performance of approximately −6 dB at 5 Hz and −11 dB at 10 Hz was confirmed.
Installation equipment photos and video were requested; a bracket fixing the floor frame and the DVIA-T45 top plate was identified and removal was requested.
After the corrective action, output performance was still insufficient; the Potentiometer value was increased to raise the float height.
Normal operation was then achieved (5 Hz: −20 dB to −25 dB, 10 Hz: −20 dB to −25 dB satisfied) and tuning was completed.
