METREL MD 9270 Manual De Instrucciones página 29

MD 9270 Leakage Clamp TRMS Meter with Power Function Description Of Functions
Peak retention function
In this function, the peak value of the waveform is shown. The peak value is the highest
measured value of the waveform and is usually higher then the efficient value (also
known as the TRMS value) e.g. for a perfect sinusoidal signal the peak value is 1.41
times the efficient value.
Measuring Power
In the following sections, the functions available in the power measuring mode (position
W and KW of the rotary switch) will be shown. To select the desired function the FUNC
key must be pressed repeatedly until the required function is selected. We should take
into account that if the value of the current is less than 4 A we should place the rotary
switch in position W position but if current is going to be higher than 4 A the function
selector in the KW position.
Active power measurement
In this function the measurement of the active power together with the measurement of
the power factor are shown on the screen. If the load is inductive, the , symbol will
appear on the screen and if the load is capacitive, the symbol will appear on screen.
In this function, we should take into account the position of the voltage terminals and the
jaw; the red terminal should be connected to the phase terminal and the jaw should be
connected in such a way that the current flows in the direction indicated on the jaw. In
this mode, data retention and registering of maximum and minimum values is possible
by using the key.
Reactive Power Measurement
In this function the measurement of the reactive power is shown together with the
measurement of the power factor. If the load is inductive, the symbol will appear on
the screen and if the load is capacitive, the. symbol will appear on screen.
In this function, we should take into account the position of the voltage terminals and the
jaw; the red terminal should be connected to the phase terminal and the jaw should be
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