Trzy sytuacje efektywny wartość multimetr
Znaczenie z poprawne wartości w multimetr
Dla przemienne prąd, jego napięcie jest a zmiana przebieg, i jego napięcie wartość jest zwykle opisane jako jego efektywna wartość. dla przykład, 220V zasilanie ma a szczyt napięcie z więcej niż 310 wolty i a szczyt-szczyt wartość z więcej niż 600 woltów.
1. efektywny wartość: It is defined by heat generation (power). A certain alternating current generrates heat through a resistor and another direct current passes through the the resistor. if the heat generated in the same time is equal, then the direct current voltage value is this alternating current. The effective value of the voltage.
2. True RMS: The definition of RMS is defined by heating, but it is difficult to measure the RMS voltage in this way in measuring instruments, so in most voltage measuring instruments, such as multimeters measure voltage, The measurement method is not measured according to the " defined the effective value. jeden z multimetrów zastosowań the sinus wave as a reference, and the effective value is obtained by the relationship between the peak value of the sine wave and the effective value twice the root sign (or Derived by the average value), the effective value obtained by this method is only correct for the AC voltage of the sinusoidal waveform, and there be deviations for other shapes of the waveform.
Inny typ z multimetr napięcie wartość jest uzyskany przez kwadrat z efektywny wartość z the DC składnik, the fundamental wave, and each higher harmonic. This value is similar to the definition of the effective value, and there is no requirement for the shape of the waveform. The sine wave is different from the effective value instrument, which is called "true effective value" in the measuring instrument.
3. Root mean square value: Another name for effective value (should be true effective value on the measuring instrument).
