Electrical Impedance

Impedance definitions 57

ticularly effective for the 4P definition of impedance. For n-terminal connec-

tions, corrections have a limited accuracy.

2.4.1 Use of telegrapher’s equations

The connection of a n-terminal-pair impedance to a meter include a voltage-

sense and a current-sense coaxial connection (which are coincident for 1P

definition). Such connections introduce propagation errors 

V

and 

I

.Ifthe

properties of the connections are known, transmission line theory (Sec. 1.6.4.4)

and the resulting telegraphers’ equations, Eq. (1.13) or (1.14), permit the

computation of an estimate of 

V

and 

I

, in order to apply a correction to the

meter reading.

For