The voltage/current measured by the electric meter, pointer meter and multimeter are inconsistent.


Phenomenon: During on-site debugging, such situations often occur: when the same voltage and current are measured by different instruments, the display is inconsistent, as small20~30, up to 60~70 deviation. So which is more accurate in measuring electricity meter, pointer meter or multimeter?

Solution: The maximum value of the three measurements shall prevail. The general situation is that the measured value of the electric meter is too large.

The way to find out the problem and the reason: what are the values measured by the three kinds of instruments? The following is a simple explanation: the pointer instrument is the average value and is calibrated according to the effective value. The multimeter measures the valid value, but its internal calculation uses the root mean square value.-The average is squared and then squared. The measured value of the electric meter is the true effective value, so for the standard sine wave, the effective value measured by the three meters is accurate. And the deviation is not big. For non-standard sine wave: for example, the missing angle sine wave of SCR voltage regulating output, the most accurate measurement of electric meter.

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