METREL MD 9270 Manuel D'instructions page 28

MD 9270 Leakage Clamp TRMS Meter with Power Function Description Of Functions
In this function, we can see the measurement of the efficient value of a specific
harmonic within the 1 to 49 range; initially it starts with harmonic 1, but this can be
modified using the HARM+ and HARM- keys. The display shows the efficient value
together with the harmonic number (to the right of the screen).
In this mode, data retention and registering of maximum and minimum values is
possible by using the key.
Harmonic analysis function (percentage values)
In this function, we can see the measurement of the percentage value of a harmonic (1
through to 49) as a percentage of the essential harmonic (the 1st one) also called the
fundamental frequency. Initially it starts with harmonic 1 but this can be changed using
the HARM+ and HARM- keys. The display shows the percentage value together with
the harmonic number (to the right of the screen).
In this mode data retention and registering of maximum and minimum values is possible
by using the key.
Crest factor sample function
In this function, we can see the value of the crest factor of the measured waveform. The
crest factor is the relationship between the peak value and the efficient (or TRMS) value
of a waveform; for a sinusoidal wave the crest value is 1.41. The greater the difference
between the peak and efficient RMS value, the higher the crest factor is.
In this mode, data retention and registering of maximum and minimum values is
possible by using the key..
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