Patent ID: 6970001

Claim:
A test probe comprising: a first conductor configured for carrying a first portion of a differential signal; a second conductor configured for carrying a second portion of a differential signal; a first variable dielectric chamber disposed between the first conductor and the second conductor and configured for holding a variable volume of dielectric fluid; a third ground reference conductor spaced from the first conductor; a second variable dielectric chamber disposed between the first conductor and the third ground reference conductor and configured for holding a variable volume of dielectric fluid to vary the distance between the first conductor and the third ground reference conductor; a fourth ground reference conductor spaced from the second conductor; a third variable dielectric chamber disposed between the second conductor and the fourth ground reference conductor and configured for holding a variable volume of dielectric fluid to vary the distance between the second conductor and the fourth ground reference conductor; and wherein varying the volume of one or more of the first, second, and third chambers results in varying the differential impedance of the first conductor and the second conductors relative to the third and fourth ground reference conductors.