What issues should pay attention to before using the multimeter?

When multimeter is used to measure circuit parameters such as resistor, voltage, current and so on, the error will be caused not only by the low accuracy grade of multimeter, but also by the measurement method, operating environment and other reasons. To reduce the measuring error of multimeter, it is necessary to master the correct operation method.

1. basic requirements for measuring the environment.

Do not use a multimeter in an environment with strong electromagnetic radiation to prevent interference from strong electromagnetic radiation and increase the measurement error.

2. basic requirements for placement.

The multimeter should be placed vertically or horizontally according to the indication of the symbols "┷" “↑” or "Ⅱ" on the head.

3. Zero should be adjusted before use.

For the pointer multimeter, check whether the needle is on the zero position of the machine before using, and adjust the measuring range every time when measuring the resistance. If the ohmic shift zero knob is turned to the maximum after the two table pen is short, the pointer is still less than 0 point. This situation is usually caused by the lack of battery voltage in the table. The new battery should be replaced to measure accurately.

4. choose the appropriate range for the multimeter based on the size of the parameters to be measured.

For example, when the DC current is measured by series method, the internal resistance of the multimeter will reduce the current of the circuit under test. The higher the voltage, the greater the equivalent internal resistance, the larger the current range used, and the smaller the error caused by the voltages of the ammeter.

This article is from Allicdata Electronics Limited.