Digital multimeters generally have these functions:
First, the digital multimeter has the function of automatic zero adjustment, but except for the capacitance block, it can ensure that the output of the multimeter is also zero when the input is zero;
Second, it can automatically convert and display the polarity, that is, when the polarity of the measured voltage or current is inconsistent with the polarity of the test leads, the meter can automatically display the negative sign, but the pointer multimeter needs to replace the test leads. For digital multimeters without automatic range switching, overload display can be automatically given when overloaded (generally display "1" or "-1", whether the negative sign is displayed or not depends on the polarity of the meter input);
Third, when the battery voltage is too low and the power supply is insufficient, the meter can automatically prompt by displaying specific symbols (such as "LOBATT", "-", etc.). In addition, some digital multimeters can automatically display the unit and symbol being measured (such as "mA", "KΩ", etc.).
