GETTING STARTED
35
Very Small Valued
Inductors
When measuring small or SMD-size inductors
with a very-low inductance, run S/C trim at the
measurement frequency (Spot trimming). The
LCR-8000G measures the difference between the
inductance of S/C trimming and the inductance of
the test component. Four-terminal fixture set is
recommended and make sure the measurement
leads are fixed during trimming.
S/C trimming is required for very small inductors
because the S/C trim value that is retracted from
the measurement can be up to 100nH. For
measurements up to 10µH, this S/C trim value can
account for up to 1% of the error.
It is recommended that for inductors of less than
10µH, that S/C trimming be used.
Wire capacitance
When measuring the wire capacitance, the fixture
clips that are marked with H
F
(High Force)/H
S
(High Sense)
should always be connected to the
point that is influenced the most by noise.
Wire inductance
The wire inductance should be subtracted from
the measurement result.
5cm, 1mm diameter wire has 50nH inductance
5cm, 2mm diameter wire has 40nH inductance
Frequency factor
in inductor
measurement
When an inductor is measured at a frequency
much lower than that for which it is designed (for
example, an HF choke tested at AF), the inductor
tends to behave as an inductive resistor. In these
circumstances, measurement accuracy is widened
by (1 + 1/Q) where Q is the quality factor.
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