Marc, Michael, Yuhang

We checked the spectrum of power supply of rack. This rack contains PLL servos.

The check was done for -24V/ground and 24V/ground. However, there were issues happened at some point. The issue is that I connected -24V to ground by mistake once. Then I heard the sound from the rack. I switched off the rack power supply as soon as I heard the sound. After that happed, I took another two spectrums. Figure 1 shows these spectrums.