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.
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.
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.
7-2 Selecting Series or Parallel Mode
Capacitance
21
Dual Display LCR Meter Instruction Manual
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