Patent ID: 6970000
Filing Date: 2005-11-29
Classification: G01R

Abstract:
1. A measuring device comprising a plurality of excitation/receiving units, wherein each of the excitation/receiving units comprises: a port; at least one receiving apparatus; at least one oscillator; and at least one independent signal generator, wherein: (a) the measuring device is adapted to be connected by at least two ports to a device under test; (b) the at least one independent signal generator is adapted to apply an excitation signal to the device under test; (c) each receiving apparatus has a mixer connected to an oscillator signal, and is adapted to receive the excitation signal, or the signal reflected from the associated port, or the signal transmitted to the associated port and convert said signal into an intermediate frequency signal; and (d) the at least one oscillator is separated from the at least one independent signal generator and is adapted to produce the oscillator signal for the mixer of the receiving apparatus, whereby a frequency and/or a phase of the oscillator signal is adjustable independently of a frequency and/or a phase of oscillators of other excitation/receiving units.