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PEM (EX)
tatsuki.washimi - 16:43 Friday 04 April 2025 (33249) Print this report
Checking of the EXV Seiemometer cablings

[YokozaWashimi]

We checked the cabling status of the EXV Seiemometer (Trillium120QA, S1707551)

  • The whiteninf filter is 15-pin type (S1605077), but a strange cable (the rack side is a D-sub 15-pin with 9 pins, and the seismometer side is a D-sub 9-pin.
  • A DC power tap is located inside a plastic box.
  • DC power to operate the Trillium was provided by a D-sub 3-pin cable with 2 pins.
  • The connection between the  Trillium cable and the D-sub 9/3 cables is a handmade one. It looks very weak. The scrues are not tightened.
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Comments to this report:
takaaki.yokozawa - 17:10 Friday 04 April 2025 (33256) Print this report
During this work, we noticed that the 1 Hz triangle like signal detected from EXV seismometer.
From Washimi-san's investigation, this would be caused by the mass mis-centering.
So we performed the mass centering.

I compared the spectrum around noon (red) and early morning (blue)
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