ultimeter current range internal resistance and standard
Regarding the internal resistance and standard of the multimeter's current gear, the internal resistance of each gear of the multimeter's DC current gear is: 500mA~1.5 ohms, 100mA~7.5 ohms, the accuracy is 2.5, and the accuracy is 2.5 means that the multimeter's measurement error is positive or negative 2.5%.
1. The internal resistance and standard of the multimeter current range
The internal resistance of the multimeter's DC current gear is: 500mA~1.5 ohms, 100mA~7.5 ohms, and the accuracy is 2.5.
What does an accuracy level of 2.5 mean?
Meter accuracy = (maximum absolute error/meter range) * 100%; the accuracy is 2.5, and the multimeter measurement error is plus or minus 2.5%.
Calculation method of multimeter internal resistance:
The meaning of 500mA~1.5 ohms: in the 500mA gear, the internal resistance of 1.5 ohms is connected in series;
The meaning of 100mA~7.5 ohms: in the 100mA gear, the internal resistance of 7.5 ohms is connected in series;
The internal resistance of the multimeter, the larger the internal resistance of the voltage range, the better, and the smaller the internal resistance of the resistance range, the better.
