Instructions on precautions for using a clamp multimeter
1. Before using a digital multimeter, carefully read the user manual to familiarize yourself with the functions of the power switch, limit conversion switch, input socket, user socket, as well as the functions of various function keys, knobs, and accessories. In addition, it is necessary to understand the limit parameters of the multimeter, as well as the characteristics of overload display, polarity display, low voltage display, and other indicator displays and alarms, and to grasp the variation law of the decimal point position. Before measurement, carefully check whether there are cracks in the probe, whether the insulation layer of the lead is damaged, and whether the probe is inserted correctly to ensure the safety of the operator.
2. Before each measurement, it is necessary to double check whether the measurement items and limit switches are in the correct positions, and whether the input socket (or dedicated socket) is selected correctly.
3. At the beginning of measurement, the instrument may experience a jumping phenomenon, and readings should be taken after the displayed value stabilizes.
4. Although digital multimeters have relatively complete protection circuits inside, it is still necessary to avoid operational errors as much as possible, such as using current mode to measure voltage, using resistance mode to measure voltage or current, using capacitance mode to measure charged capacitors, etc., to avoid damaging the instrument.
5. If only the highest digit displays the number "1" and all other digits go blank, it indicates that the instrument has been overloaded and a higher limit should be selected.
6. It is prohibited to toggle the limit switch when measuring voltages above 100V or currents above 0.5A, in order to avoid arcing and burning out the contacts of the conversion switch.
7. The number marked with a danger sign next to the input socket represents the limit value of the input voltage or current for that socket. Once exceeded, it may damage the instrument and even endanger the safety of the operator.
8. A clamp multimeter shall not be used to measure the current of high-voltage lines. The voltage of the tested line shall not exceed the voltage level specified by the clamp multimeter (generally not exceeding 500 volts) to prevent insulation breakdown and personal electric shock.
9. Measurement should estimate the magnitude of the measured current, select an appropriate range, and do not use a small range gear to measure large currents.
10. Before measurement, be sure to set the range switch to the corresponding AC current position. Do not use voltage or resistance settings to measure current. Remember! Never use the resistance and current settings to measure voltage, otherwise, if not careful, it may burn out the meter.
11. Only one wire can be clamped in each measurement. When measuring, the tested wire should be placed in the center of the clamp to improve the accuracy of the measurement. It is best to flatten the watch body with your hands and avoid letting the wires rest on the jaws and watch body as much as possible.
12. After the measurement is completed, the range switch must be turned to the maximum voltage range position, and then the power switch must be turned off to ensure safe use next time.
