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Notes on Use
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NOTE
･ This unit is electrically configured specifically for AC currents. Thus signals
with elements of DC currents (such as all-wave rectifier) cannot be
measured.
･ For accurate measurement, allow the unit to warm up for more than half an
hour before starting operation.
･ Note that limits are specified for the range in which voltage and current level
accuracies are guaranteed.
･ The values for apparent power (S), reactive power (Q), power factor (λ)
and phase angle (φ) produced by this unit are computed from the measured
voltage (U), current (I), and active power (P), using the expressions given in
the specifications. The values given may be different from those measured
with an instrument of different operating principles or using different
calculation expressions.
･ This machine's integration value is derived from the measured values of the
electrical current and electrical power and calculated by the software. The
integration value may be different from other instruments that have differing
response times, sample rate or calculation expressions.
･ Accurate measurement may be impossible in locations subject to strong
external magnetic fields, such as transformers and high-current conductors,
or in locations subject to strong external electric fields, such as radio
transmission equipment.
･ Due to the internal circuitry, when measuring objects that contain certain
specific wave lengths, the indicated value of power may periodically shift
and not settle down. (Specifically, this occurs when measuring distorted
waves containing a large amount of high frequency waves which are the
even number multiple of 2.44 kHz.)
･ When the input is less than 0.1% of the measurement range for current and
less than 40μA, the indication is forcibly set to zero. It is also set to zero
when the input is less than 0.2% of the measurement range for voltage, or
less than 0.1% for active power.
･ The 3332 has a frequency measurement function, but this may produce
unexpected results on a waveform which is severely distorted.
･ When a maximum rated voltage to earth of high frequency is applied (as for
example when measuring the secondary side of an inverter), errors may
occur in the measured values.
･ To ensure the accuracy of measurement be careful not to let the unit
overheat. (Keep away from sources of heat, and provide sufficient ventilation
space around the unit, or when rack-mounted provide a cooling fan.)
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