Hioki IM3533, Instruction Manual

Page: 381 / 400

Appendix
Appendix7 Series Equivalent Circuit Mode and Parallel Equivalent Circuit Mode
A11
The instrument measures the current flowing to the test sample and the voltage at both ends of the test sam-
ple, and determines Z and

. Other measurement items such as L, C, and R are calculated from Z and

.
At this time, the mode for calculation becomes series equivalent circuit mode if the resistance components for
C (or L) are assumed to be in series, and the mode becomes parallel equivalent circuit mode if the resistance
components for C (or L) are assumed to be in parallel. It is, therefore, necessary to select the correct equiva-
lent circuit mode to reduce errors because the calculation formula differs for series equivalent circuit mode
and parallel equivalent circuit mode.
Generally, for measurement of a low impedance device (approx. less than 100

) like a large capacitance
capacitor or a low inductance, a seriesequivalent circuit mode will be selected. While, for a high impedance
device (approx. more than 10 k

) like a small capacitance capacitor or a high inductance, a parallel-equiva-
lent circuit mode will be selected. When you are not sure about selection of circuit mode, please ask the parts
maker. (ex. a impedance approx. between 100

and 10 k

)
Appendix7 Series Equivalent Circuit Mode and
Parallel Equivalent Circuit Mode
Series equivalent circuit Parallel equivalent circuit
C (or L)
C (or L)
Because measurement value in each equivalent circuit mode is obtained through calcula-
tion, measurement values of both modes can be displayed. However, please note that the
appropriate equivalent circuit depends on the test sample.