결함 in 디지털 멀티미터 및 솔루션
대지 공통 디지털 멀티 미터 일반적으로 저항 측정 % 2c 온-오프 사운드 감지 % 2c 및 다이오드 앞으로 전압 측정 . AC 및 DC 전압 및 전류 측정 % 2c 3 극관 배율 및 성능 측정 % 2c etc. 일부 있음 추가 기능 예 as 커패시턴스 측정 % 2c 주파수 측정 % 2c 온도 측정 % 2c 데이터 메모리 및 음성 보고, which bring great convenience to the 실제 감지 작업. 그러나, 기한 to 부적절한 사용 의 디지털 정사각형 미터, it is 쉬운 to 원인 손상 to the components in the meter and cause malfunctions during actual testing. The matters needing attention in the use of the digital multimeter are for beginners to use for reference, so as to prevent damage to the digital multimeter as much as possible.
원인 of 디지털 멀티미터 실패 및 예방 조치:
1. In most cases, the damage of the digital multimeter is caused by the wrong measurement position. For example, when measuring the AC mains, the measurement position is selected to be placed in the electric block. In this case, once the test pen touches the mains, the multimeter will be damaged instantly. Damaged internal components. Therefore, before using the multimeter to measure, be sure to check whether the 측정 기어 is 정확합니다. After use, set the measurement option to AC 750V or DC 1000V, so that no matter what parameter is mismeasured in the next measurement, it will not cause damage to the digital multimeter.
2. Some digital multimeters are damaged because the measured voltage and current exceed the range. For example, if the mains is measured at the AC 20V gear, it is easy to cause damage to the AC amplifier circuit of the digital multimeter, and the multimeter loses the AC measurement function. When measuring DC voltage, if the measured voltage exceeds the measurement range, it is also easy to cause circuit failure in the meter. When measuring the current, if the actual current value exceeds the range, generally only the fuse in the multimeter will be blown, and no other damage will be caused. Therefore, when measuring voltage parameters, if you do not know the approximate range of the measured voltage, you should first set the measurement gear, and then change the gear measurement after measuring its value to get a more accurate value. If the voltage value to be measured is far beyond the maximum range that the multimeter can measure, a high-resistance measuring probe should be equipped. Such as detecting the anode high voltage and focusing high voltage of black and white color TV.
3. The upper limit range of DC voltage of most digital multimeters is 1000V, so when measuring DC voltage, the maximum 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. 그러나, 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 causeing damage to the multimeter and making the measurement inaccurate, in serious cases, the multimeter can also be used without any vibration. show.
4. 언제 측정 저항, be 조심스러운 not to measure with electricity.
