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VIS (BS)

satoshi.tanioka - 18:09 Wednesday 27 June 2018 (5404)

Geophone Noise Hunting

Tanioka with a help from Fujii-san

As Shoda-san reported (5367), geophones have bad noise levels compared to those of ETMX.
We tried to find the noise source, but we have not done so far.

We confirmed that the connection of the cables.
Then we replaced the Geophone Distributor with that of SRM and measured noise level.
However, the condition was not improved.

We are doubting that cables might cause these noise and will invetigate tommorow.

Images attached to this report

Comments to this report:

yoshinori.fujii - 19:41 Wednesday 27 June 2018 (5407)

> We are doubting that cables might cause these noise and will invetigate tommorow.
possibility woud be:
- long cables
- adapter cables (to the Geophone distributer).
(- pre-amp circuits in the pods)
In any case I really want to open the BS tank.