A new short-bar method for 4TP admittance standards calibration by using modified Z-matrix expression to improve S/N for higher impedance

This paper describes how to calibrate four-terminal-pair (4TP) admittance standards using a new short-bar method with modified Z-matrix expression containing a correction term. The short-bar method is to measure the signal to correspond to the standard with better S/N for higher impedance standard, especially 1 pF. Therefore a 1 pF capacitor can be calibrated containing the direct measurement at reporting frequencies. As this method does not require the equivalent circuit, it can be applied to general 4TP admittance calibration.