Patent ID: 8738314
Filing Date: 2014-05-27
Classification: G01R

Abstract:
1. A high frequency measurement apparatus that is connected to a connection point between a load including a plasma processing apparatus and a high frequency power source apparatus and that detects high frequency voltage and high frequency current at the connection point, the high frequency measurement apparatus comprising: a voltage detector for detecting high frequency voltage at the connection point; a current detector for detecting high frequency current at the connection point; a calibrator for calibrating a voltage value detected by the voltage detector and a current value detected by the current detector; and an impedance calculator for calculating an impedance as viewed from the connection point toward the load based on the voltage value and current value calibrated by the calibrator, wherein the calibrator comprises: a first calibration unit for calibrating the detected voltage value and current value by using a basic parameter calculated based on three impedances calculated by the impedance calculator when the high frequency measurement apparatus is connected to each of three basic reference loads and impedances of the three basic reference loads; a determiner for determining in which range an impedance calculated from the voltage value and current value calibrated by the first calibration unit lies when the impedance is indicated in a Smith chart whose entire impedance range is divided into a plurality of ranges; and a second calibration unit for further calibrating the voltage value and current value calibrated by the first calibration unit by using a range-specific parameter calculated based on three impedances calculated by the impedance calculator when the high frequency measurement apparatus is connected to each of three range-specific reference loads having three impedances that enclose a range determined to be the range in which the impedance lies by the determiner and impedances of the three range-specific reference loads.