Marc, Michael, Yuhang

Yesterday morning we started the measurement of opto-mechanical transfer functions to check the AA filter design (results will follow in another entry)

During this activity we injected noise in input pitch and yaw using diagui.

In order to send these noises from diagui we had to close the damp loop of input.

When we tried to do the same for end mirror we first could not see any noise so we remove many filters (especially 50 and 100 Hz notches) from this loop and then had a FC unlock due to an extremely large offset that we forgot to remove.

I think it is the only modification between your last 2 measurements, but as this loop had a gain of 0, it might not affect the apparition of this peak...