はじめに 原因 の 損傷 デジタル マルチメータ
In most case, damage to a digital multimeter is caused by incorrect measurement gear. For example, when measureing AC mains power, the measurement gear is selected to be in the resistance gear. in this case, once the probe contacts the mains power, it can instantly cause damage to the internal components of the multimeter. Therefore, before using a multimeter for measurement, it is required to check whether the 測定 ギア は 正しい. 後 使用, 場所 the 測定 at どちらか AC 750V または DC 1000V, so that no matter what parameter is 誤って 測定 in the next measurement, it will not 原因 損傷 to the デジタル マルチメーター。
Some digital multimeters are damaged due to the measured voltage and current exceeding the range. For example, measuring the mains power in the AC 20V gear can easily cause damage to the AC amplification circuit of the digital multimeter, causing the multimeter to lose its AC measurement function. When measuring DC voltage, exceeding the measurement range can also cause circuit faults in the meter. When measuring current, if the actual current value exceeds the range, it usually only causes the fuse in the multimeter to burn out and will not cause any other damage. So when measuring voltage parameters, if you don't know the approximate range of the measured voltage, you should first set the measurement gear to the highest gear, measure its value, and then shift gears to obtain a more accurate value. If the voltage value to be measured far exceeds the maximum range that a multimeter can measure, a high resistance measuring probe should be equipped separately. For example, detecting the second anode high voltage and focusing high voltage of black and white color televisions.
ほとんど デジタル マルチメータ 持っている a DC 電圧 上限 制限 範囲 of 1000V, so when 測定 DC 電圧, the 最高 電圧 値 is below 1000V, which generally does not damage the multimeter. if it 超過 1000V, it is highly likely to cause damage to the multimeter. ただし, the 上限 測定可能 電圧 制限 値 of 異なる デジタル マルチメータ may vary. if the the 測定 電圧 超 範囲, 抵抗 電圧 低減 can be used for measurement. In addition, when measureing high DC voltage of 400-1000V, the probe must be in good contact with the measuring point and there must be no shakeing. Else , in addition to causing damage to the multimeter and inprecise measure, it can also cause the multimeter to show no display in severe cases.
