Hioki 3257-50, Инструкция по эксплуатации

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• Accurate measurement may be impossible in the
presence of strong magnetic fields, such as near
transformers and high-current conductors, or in
the presence of strong electromagnetic fields
such as near radio transmitters.
• To avoid battery depletion, turn the function
selector OFF after use (the Auto Power Save
feature consumes a small amount of current).
• The indicator appears when battery voltage
becomes low. Replace the batteries as soon as
possible.
• Rectification method (true RMS and mean)
There are two methods for converting AC signal
to an RMS value: the true RMS method (true
RMS indication) and the mean method (mean
rectification RMS indication). Although the two
methods both yield the same value for a perfect
(undistorted) sine wave, differences occur when
the target waveform becomes distorted. The
instrument uses the mean method (rectification
RMS indication method). Input waveforms are
treated as sine waves (single-frequency only),
and the AC signal's mean value is calculated
and converted to an RMS value. Waveform dis-
tortion causes the measurement error to
increase. Waveforms containing harmonic com-
ponents are calculated using the RMS formula
and displayed.