Amprobe ACD-30P Clamp-On-Power-Meters - Manual (Page 6)

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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.
●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.
THD%-F Total Harmonic Distortion-Fundamental function (model ACD-41PQ only)
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
momentarily toggles THD% readings to main display to get full readings up to 999.9
THD%.