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Elma 6400 LCR Meter Manual

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Inductance
Typically,a 1 kHz test frequency is used to measure inductors that are used in
audio and RF circuits.This is because these components operate at higher
frequencies and require that they be measured at higher frequencies such as 1
kHz or 10 kHz. However,a 120 Hz test signal is used to measure inductors that
are used for applications such as filter chokes in power supplies, in which are
typically operated at 60 Hz AC (in U.S.) with 120 Hz filter frequencies. In general,
inductors below 2 mH should be measured at 1 kHz frequency while inductors
above 200 H should be measured at 120 Hz. In all cases, it is best to check with
the manufacturer’s data sheet in order to determine the best test frequency to use
for measurement.
8-2 Selecting Series or Parallel Mode
Just as test frequency can greatly affect measurement results, selecting between
series or parallel measurement mode can also affect the accuracy of the
meter,especially for capacitive and inductive components.Below are some
recommendations to consider.
Capacitance
For most capacitance measurement,selecting parallel mode is the best.Most
capacitors have very low dissipation factor (high internal resistance) compared to
the impedance of the capacitance. In these cases,the paralleled internal
resistance has negligible impact upon the measurement. Though in some
cases,series mode would be preferred. For instance, measuring a large capacitor
would require using series mode for optimal reading. Otherwise, the meter may
show the reading results as out of accuracy or erroneous. Series mode is use
because large capacitors often have higher dissipation factor and lower internal
resistance.
Inductance
For most inductance measurement, selecting series mode is the best. This is
because in this mode, accurate Q (quality factor) reading can be obtained from
reading low Q inductors and ohmic losses are significant. Though in some cases,
parallel mode would be preferred. For example, iron core inductors operating at
higher frequencies where hysteresis and eddy currents become significant would
require measurement in parallel mode for optimal results.
8-3 Accuracy Discrepancies
In some special cases, inaccuracies may occur in the measurement of capacitive,
inductive, and resistive components.
Capacitance
When measuring capacitors, it is always most desirable if the dissipation factor is
low. Electrolytic capacitors inherently have a higher dissipation factor due to their
normally high internal leakage characteristics. In some cases, if the D (dissipation
factor) is excessive,measurement accuracy may degrade and even read out of
specification.
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