1. Before each measurement, check again whether the measurement item and the limit switch are in the correct position, and whether the input jack (or special socket) is selected correctly.
2. Before measuring, pay attention to turn the range switch to the corresponding AC current gear. You cannot use the voltage gear and resistance gear to measure the current. Remember! Never use the resistance gear and the current gear to measure the voltage, otherwise, if you accidentally , will burn the meter.
3. Before using the digital multimeter for instrument calibration, read the instruction manual carefully to be familiar with the switch function and the function of the limit switch, input jack, socket and various function keys, knobs and accessories. In addition, you should also understand the limit parameters of the multimeter, the characteristics of overload display, polarity display, low voltage display and other indicator displays and alarms, and master the change rule of the decimal point position. Before measuring, carefully check whether the test leads are cracked, whether the insulation layer of the leads is damaged, and whether the test leads are inserted correctly to ensure the safety of the operator.
4. The number marked with the danger mark next to the input jack represents the limit value of the input voltage or current of the jack. Once exceeded, it may damage the instrument and even endanger the safety of the operator.
5. The meter will appear jumping number phenomenon when measuring, should wait for the displayed value to stabilize before reading.
6. Although the digital multimeter has a relatively complete protection circuit, it is still necessary to avoid misoperations in operation, such as using the current to block the voltage, use the electricity to block the voltage or current, and use the block to measure the charged, etc. , so as not to damage the instrument.
7. If only the highest digit displays the number "1", and other digits are blanked, it proves that the meter has been overloaded, and a higher limit should be selected.
