2020/12/2
We investigated XPcal noise.
What we found today:
- If we connect D-sub GND(=5th pin) and DC power GND, the noise at excitation and error point decrease by 10dB.
- We found a large sin wave(>1V) at 500kHz at the excitation signal from DGS. (attached picture)
- Even if we connected excitation cable with OFS box, the noise at excitation cable did not change.
- After we connect D-sub GND(=5th pin) and DC grand, the fluctuation of excitation noise became stable.
