Patent ID: 11908665
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. The plasma processing apparatus according to claim 12, wherein
the measuring device includes
a current sensor located on the electric path and configured to measure a current value of a current flowing through the edge ring,
a first voltage sensor configured to measure a first potential difference across a first area of the edge ring, the first area extending in a first part of a plane including the first contact, the second contact, and the central axis, and
a second voltage sensor configured to measure a second potential difference across a second area of the edge ring, the second area extending in a second part of the plane, and

the measuring device determines the resistance based on an average of the first potential difference and the second potential difference and on the current value.