MD 9240 True RMS Power Clamp Meter Operation
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CAUTION (Application and removal of the Clamp-on meter)
For non-invasive ACA current measurements, press the jaw trigger and clamp
the jaws around only one single conductor of a circuit for load current
measurement. Make sure the jaws are completely closed, or else it will introduce
measurement errors. Enclosing more than one conductor of a circuit will result in
differential current (like identifying leakage current) measurement. Locate the
conductor(s) at the Jaws center as much as possible to get the best measuring
accuracy. For removal, press the jaw trigger and remove the jaws from the
conductor(s).
Adjacent current-carrying devices such as transformers, motors and conductor
wires will affect measurement accuracy. Keep the jaws away from them as much
as possible to minimize influence.
HD%-F Total Harmonic Distortion - Fundamental function
THD%-F = (Total Harmonics RMS / Fundamental RMS) x 100%
Total Harmonic Distortion - Fundamental (THD%-F) is the percentage ratio of the Total
Harmonics RMS value to the Fundamental RMS value of a voltage or current signal,
and is given by the above expression. An ideal sinusoidal waveform has a value of 0
THD%. A badly distorted sinusoidal waveform may have a much higher THD% value of
up to several hundreds.
When the meter is in ACV or ACA function, THD%-F values up to 99 THD% will be
displayed in the secondary mini display automatically. Press THD%-F button
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