Hioki 3511-50, Instruction Manual, Page: 26 / 140

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3.5 Setting the Equivalent Circuit Mode
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3.5.1 Equivalent Circuit Mode
Series equivalent circuit mode
Parallel equivalent circuit mode
D = 0 C C
D = 0.1 1.005C 0.995C
D = 0.5 1.118C 0.8944C
(Where C is the static capacitance)
3.5 Setting the Equivalent Circuit Mode
You may set an equivalent circuit mode. Automatic selection is also
possible.
The 3511-50 unit analyses the test sample in terms of a pure inductive
component (L), an equivalent circuit construction composed of a pure
capacitive component (C), and a pure resistive component (R), and
calculates as though these components were connected in series, or
alternatively connected in parallel. Therefore, it is possible for the user to
select either a series equivalent circuit mode or a parallel equivalent circuit
mode for this conceptual connection together of these L, C, and R
components.
When the impedance of the sample being tested is relatively high, the
parallel equivalent circuit mode should be selected manually, and when the
impedance of the sample being tested is relatively low, the series equivalent
circuit mode should be selected manually.
Generally, for a device such as an electrolytic capacitor or the like with a
high D value (i.e., a low Q value), the test values obtained when testing
using series equivalent circuit mode differ from those obtained when testing
using parallel equivalent circuit mode. The greater the resistance component
in the sample being tested, the more this difference in the test values
appears.
For example, the test values for capacitors of the same capacitance which
have different values of D in series equivalent circuit mode and in parallel
equivalent circuit mode may be as follows: