[Takano, Washimi]

We performed shaker injection tests for the OMMT-OMC duct, remotely from the control room.

Fig.1 is the spectrograms of 70-200Hz and 70-100Hz swept sine injection test. DAC amplitude was 40 counts.
At 82Hz and 92Hz, broadband excess were found in the OMC TRANS.

Fig.2 and Fig.3 are the results of the single line injection for these frequencies.