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 explain 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. For current
measurements (mA, A), it is recommended to
disconnect the test leads (see “Warning”
section).
TRMS value measurement
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 ratio of the higher frequency components
in the signal to 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 mode data hold is possible as well as the registering the maximum and minimum
values using the
H
key.
Frequency measurement
In this function, the frequency of the measured signal is displayed. Press the
F
button
for more than 2 s in the TRMS measurement mode to enter frequency measurement
mode. To return to THD, press the same button again during more than 2 s.
