Ver 2.1

12/03/01

4

Actually, Rs and Rp are existed in the equivalent circuit of capacitor or inductor. If

the capacitor is small, Rp is more important than Rs. If capacitor is large, the Rs is more

important also. Therefore, use parallel mode to measure lower value capacitor and use

series mode to measure higher value capacitor. For inductor, the impedance relationship

is different from capacitor. If the inductor is small, Rp is almost no effect. If inductor is

large, the Rs is no effect also. Therefore, use series mode to measure lower value

inductor and use parallel mode to measure higher value inductor.

Open/short calibration

The ES51919/ES51920 chipset provides the open/short calibration process to get the

better accuracy for high/low impedance measurement. The purpose of open/short

calibration is to reduce the parasitic effect of the test fixture.

Co

j

Go

ω

+

1

open/short calibration process to cancel the effect of Rs + jωLs and Go+jωCo.