Patent ID: 7169625

Claim:
A method of evaluating a process chamber, comprising: performing a first substrate processing operation and a first process perturbation operation in a reference chamber; collecting optical emission spectroscopy (OES) data and radio frequency (RF) data during the first substrate processing operation and the first process perturbation operation; performing a first multivariate analysis on the collected OES and RF data from the reference chamber to produce first multivariate analysis results; performing a second substrate processing operation and a second process perturbation operation in a process chamber that is under study, where the first process operation and the second process operation are similar, and the first process perturbation operation and the second process perturbation operation are similar; collecting OES data and RF data during the second process operation and the second process perturbation operation; performing a second multivariate analysis on the collected OES and RF data from the chamber under study to produce second multivariate analysis results; and comparing the second multivariate analysis results from the chamber under study to the first multivariate analysis results from the reference chamber.