[Steve, Manasa]
To find noise source
1. Swapped the power cable of the PD and checked that it is connected to the right power source.
2. Changed the aluminium base of the post holding the diode so that the diode is floating
3. Grounded the table and the rack
4. Routed the cable on the other side of the beam tube to isolate it from other cables.
After all the above, we still found that shaking the cable was making TRY noisy.
I pulled out the PD whitening board to replace the 4 pin lemo connector with a bnc connector so that we can swap the cable with a new one. So there is no TRY right now.
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