There will be some errors when measuring with a multimeter. Some of these errors are the maximum absolute errors allowed by the accuracy class of the meter itself.
Some are human errors caused by improper adjustment and use. Correctly understand the characteristics of the multimeter and the causes of measurement errors, and master the correct measurement techniques and methods, you can reduce the measurement errors.
Human reading error is one of the reasons that affect the measurement accuracy. It is unavoidable, but can be minimized. Therefore, special attention should be paid to:
1. Before measurement, place the multimeter horizontally and perform mechanical zero adjustment;
2. Keep your eyes vertical to the pointer when reading;
3. When measuring resistance, zero adjustment should be performed every time the gear is changed. If it is not adjusted to zero, replace the battery with a new one;
4. When measuring resistance or high voltage, do not hold the metal part of the test lead with your hands, so as to avoid shunt of human body resistance, increase measurement error or electric shock;
5. When measuring the resistance in the RC circuit, the power supply in the circuit should be cut off, and the electricity stored in the capacitor should be discharged before the measurement.
After excluding human reading errors, we do some analysis on other errors.
