[Aritomi, Eleonora, Matteo, Yuhang]

Investigations carried on yesterday and today seem to confirm that we might have a problem in the powering of the homodyne detector. 

The main clue is that we cannot observe any change in its output signal when the power cable is connected and when it is not.

We do see a change in the spectrum of the signal when we shine a laser with an amplitude modulation (see Fig. 1) but the signal is the same even if we disconnect the power cable.

We checked the power cable connections and confirmed that the voltage arriving to the homodyne through it is the correct one.

Fig. 2, 3 show the homodyne detector and the setup.