Patent ID: 8022687

Claim:
Method for the measurement of a device under test using a network analyzer with several test ports, at least one signal generator for the excitation of the device under test and at least one local oscillator for measuring the signal reflected or transmitted from the device under test according to the principle of superposition, the method comprising: in the event of a frequency change, varying the frequency of the signal generator and the frequency of the local oscillator successively in an alternating manner, wherein, in the event of a change of the frequency of the signal generator, the frequency of the local oscillator remains unchanged and, in the event of a change of the frequency of the local oscillator, the frequency of the signal generator remains unchanged; and registering the phase change associated with the frequency change of the signal generator or respectively of the local oscillator by measuring the phase change of the superposed signal from the generator signal of the signal generator and the oscillator signal of the local oscillator.