Patent ID: 6297647
Filing Date: 2001-10-02
Classification: G01R,H04B

Abstract:
A test unit for conducting crosstalk measurements of a cable under test, said test unit comprising:a plurality of pairs of output terminals, each pair of output terminals having a first terminal with a first parasitic capacitance and a second terminal with a second parasitic capacitance;a first variable capacitor connected in circuit with said first terminal to form a first effective capacitance value including said first parasitic capacitance;a second variable capacitor connected in circuit with said second terminal to form a second effective capacitance value including said second parasitic capacitance; anda controller for setting said first variable capacitor to a first predetermined value and said second variable capacitor to a second predetermined value, said first predetermined value and said second predetermined value being selected such that said first effective capacitance value is substantially equal to said second effective capacitance value, whereby the effect of unequal values of said first and second parasitic capacitances on an output signal balance of said first and second terminals is minimized.