B&K Precision 886 - Manual - Manual (Page 40)

37
Z
m Y
o
Zdut
Z
m
- Z
s
Zdut =
1-(Z
m
-Z
s
)Y
o
(d) Compensation Equation
Z
s
Figure 3.7 (Continued)
4.3 Selecting the Series or Parallel Mode
According to different measuring requirement, there are series
and parallel modes to describe the measurement result. 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 large capacitor means the low
impedance; the small capacitor means the high impedance.
Figure 3.8 shows the equivalent circuit of capacitor. If the
capacitor is small, the Rp is more important than the Rs. If the
capacitor is large, the Rs shouldn’t be avoided. Hence, uses
parallel mode to measure low capacitor and series mode to
measure high capacitor.