Patent ID: 7315170
Filing Date: 2008-01-01
Classification: G01R

Abstract:
1. A method for calibrating frequency properties in an apparatus for measuring the properties of a device under test connected by a signal transmission path having reciprocity, said method comprising: connecting an open circuit as a resistance load to a terminal on the device under test side of the signal transmission path; transmitting step pulse signals as reference signals to a terminal on the measuring apparatus side of the signal transmission path; monitoring and analyzing the spectrum of the transmitted reference signals on the measuring apparatus by a Fourier transform; monitoring and spectrum analyzing, on the measuring apparatus, the reference signals reflected from a terminal on the device under test side of the signal transmission path by a Fourier transform; and referring to the coefficient obtained based on the impedance of the resistance load, the spectrum of the transmitted reference signals, and the spectrum of the reflected reference signals, and finding the frequency properties of the signal transmission path.