Proper Use and Basic Maintenance of Multimeters
Multimeters are widely used in experimental and practical teaching as well as in the maintenance of instruments and meters. This paper introduces the correct operation methods and requirements of multimeters, together with precautions during use.
Multimeters come in various structures, with different layouts of knobs and switches on the panel. Therefore, before using a multimeter, one should carefully understand the functions of each component and identify the measurement quantities corresponding to each scale on the dial.
Special attention must be paid to the proper operation of multimeters, since most multimeter faults are caused by improper handling. Using a multimeter correctly is in fact the best way to maintain it.
In addition, only correct operation can minimize measurement errors. Before use, place the multimeter horizontally and check whether the pointer is at zero. If not, adjust the mechanical zero-adjustment screw in the middle until the pointer aligns with zero. Connect the lead of the red test probe to the red terminal or the jack marked "+", and the lead of the black test probe to the black terminal or the jack marked "−".
Turn the selector switch to the appropriate position according to the quantity to be measured. For example, when measuring AC voltage, set the switch to the corresponding area. Some multimeters have separate function selection knobs and range selection knobs. During operation, first set the function selection knob to the position matching the measured quantity, then adjust the range selection knob to a proper range. Great care must be taken in selecting the function, otherwise serious consequences may occur.
