Uehara, Kokeyama, Kohei Yamamoto

With the checker boards(1st figure), we continued to look into the BO problem of the common mode servo board for MZM experiment(related link).

We use two BO cables(BO1 & BO2) and...

-While nothing changed for the BO1 even when we switched binary signal on medm, the BO2 cable worked as expected. 

-We changed the BO card for the BO2 cable, but nothing happened.

-With a diagnostic tester(pochipochi, 2nd figure) directly connected to the common mode servo board, the BO1 cable worked well

-The electric potential between the ground and each electrode seemed strange.

With the above symptoms, we think that there is no problem on the circuit and the model and suspect the problem related to the ground.