Failure factors for digital multimeters and how to maintain them
Triode magnification and performance measurements, AC and DC voltage and current measurements, etc. The real detection task is greatly facilitated by the addition of features like capacitance measurement, frequency measurement, temperature measurement, data memory, and voice reporting in some digital multimeters. However, it is simple to harm the components in the meter and cause faults during actual testing owing to improper use of digital square meters. Beginners can utilize the issues that need to be addressed when using the digital multimeter as a guide to prevent as much harm to the device as feasible. Failure factors for digital multimeters and remedies:
1. In the majority of situations, the incorrect measuring position is to blame for digital multimeter damage. For instance, the measurement position is chosen to be in the electric block while measuring the AC mains. In this scenario, the multimeter will be irreparably damaged the moment the test pen meets the mains. interior parts that are harmed. Therefore, be sure to verify that the measurement equipment is accurate before using the multimeter to take measurements. After use, change the measurement option to AC 750V or DC 1000V to ensure that the digital multimeter won't be harmed by any mismeasured parameters in subsequent measurements.
2. Because the recorded voltage and current exceed the range, certain digital multimeters are destroyed. For instance, if the mains is measured using AC 20V equipment, it is simple to destroy the digital multimeter's AC amplifier circuit, which results in the multimeter losing its ability to measure AC. It is also simple to bring about circuit failure in the meter when measuring DC voltage if the detected voltage exceeds the measurement range. If the actual current value during measurement exceeds the range, the multimeter's fuse will typically blow and no further damage will result.Therefore, while measuring voltage parameters, you should first set the measurement gear to the highest gear and then change gears after measuring its value to acquire more precise data if you are unsure of the approximate range of the recorded voltage. The multimeter should include a high-resistance measuring probe if the voltage value to be measured is significantly higher than the range the multimeter can measure. For instance, black and white color TV's high voltage focusing and second anode detection.
3. The upper limit range of DC voltage of most digital multimeters is 1000V, so when measuring DC voltage, the highest voltage value is below 1000V, and generally the multimeter will not be damaged. If it exceeds 1000V, it is very likely to cause damage to the multimeter. However, the upper limit of measurable voltage may be different for different DMMs. If the measured voltage exceeds the range, it can be measured by resistance drop method. In addition, when measuring the DC high voltage of 400 ~ 1000V, the test leads must be in good contact with the measuring place without any jitter, otherwise, in addition to possibly causing damage to the multimeter and making the measurement inaccurate, in serious cases, the multimeter can also be used without any vibration. show.
4. When measuring resistance, be careful not to measure with electricity.
