Bk-precision 889B - Manual Manual do Utilizador descarregar pdf (Página 30)

CUR

POT

CUR

POT

Zdut

Redundant

Impedance

)

Parastic

Conductance

)

Parastic of the Test Fixture

(a) Parastic Effect of the Test Fixture

HCUR

HPOT

LCUR

LPOT

(b) OPEN Measurement

OPEN

o = Go + j£sCo

(Rs + j£s<< )

Go+j£sCo

CUR

POT

CUR

POT

SHORT

= R

+ j£sL

Zdut

- Z

Zdut =

1-(Z

-Z

(d) Compensation Equation

Figure 4.7

4.3 Selecting the Series or Parallel Mode

According to different measuring requirement, there are series and parallel modes to describe the

measurement results. It is depending on the high or low impedance value to decide what mode to be used.

 Capacitor

The impedance and capacitance in the capacitor are negatively proportional. Therefore, the larger

capacitance means the lower impedance, the smaller capacitance means the higher impedance. Figure 4.8

shows the equivalent circuit of capacitor. If the capacitance is small, the Rp is more important than the Rs. If

the capacitance is large, the Rs shouldn’t be avoided. Hence, it is properly to use parallel mode for low

capacitance measurement and series mode for high capacitance measurement.

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