MD9272 Leakage Clamp TRMS Meter with Power Function Description of Functions
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3. Description of Functions
Measuring mA, A and V
The following sections show the functions available in the current (mA and A) and voltage
(V) measurement mode (positions of the rotary switch in mA, A and V). To select the
desired function the F key shall be pressed repeatedly until this is selected. For current
measurements (mA, A), it is recommended to disconnect the test leads (see “Warning”
section).
TRMS value measurement function
In this function, we can see the measurement of the effective value of the current or the
voltage together with a second reading: the THD (total harmonic distortion ratio) or the
frequency of measured signal. The THD is a relationship between the frequency
components of the signal with the essential component (at 50 Hz or 60 Hz) expressed in
percentage. A high THD value indicates high distortion of the measured signal whilst a
0%THD indicates that the measured signal wavelength is a pure sinusoid. In this way
data retention is possible as well as the register of maximum and minimum values using
the H key.
Frequency measurement
In this function, the frequency of the measured signal is displayed. F button shall be
pressed for more than 2 s in the TRMS measurement function to enter frequency
measurement mode. To return to THD, the same button shall be pressed again during
more than 2 s.
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