Aritomi and Yuhang

We measured backscattering noise with different kinds of filters added to the servo we had. The added filters contain corner frequency ranging from 0.03Hz to 10Hz. The gain is also adjusted for different corner frequencies. All the measurement is plot together in the attached figure.

According to the measurement done in last Friday, we have a variation region of back scattering noise. It is shown in the attached figure as a grey area.

We could see no matter how we set the filters, the back scattering noise is always in the variation region.