the AC/DC 電圧 範囲 of the マルチメータ および the AC/DC type of the measured voltage are correct, the デジタル マルチメータ 意志 表示 a - 符号 when 測定 DC 電圧, および the ポインタ of the pointer multimeter will swing in the 正 方向。
The DC voltage reading of the digital multimeter will be very small or basically zero when measuring the AC voltage, and the DC voltage reading of the pointer multimeter will also be very small or no swing when measuring the AC voltage. The same is true for measuring DC voltage with the AC voltage file of the multimeter. At this time, you should find that the type of voltage to be measured is incorrect, and you should re-select the correct AC/DC voltage type gear of the multimeter.
In 追加, いつ the 電圧 レベル of 電源 to be tested is not clear, the 高電圧 ギア すべき be switched to the 低電圧 ギア 最初の, そして the the 低電圧 ギア すべき 徐々に 切り替え to the gear with the most 適切 読み取り 解像度 そして the 最も 正確 反射 of the 測定 値 to 保証 安全性。
You can first measure it with an AC voltage of 750V, and look at the display value. if it is very small or basally not display, you can test it with a DC voltage file!
最初 使用 最大 AC 電圧 for 測定, および その後 使用 the 適切 範囲 for 正確 測定 後 決定 the 範囲. if there is no stable value in reality, it is DC. Change to the highest level of DC 電圧 to measure the おおよそ 値. 後 決定 the range, change to the 適切 範囲 for 正確 読み取り。
Use the maximum AC 電圧 file to measure the 正 および 負 側面 first. if the two voltage are consistent, it is AC, else it is DC~
これ is a コモン センス to use the multimeter 正しく. 測定 the 電圧 of an unknown 電源 電源, ターン the multimeter to the maximum AC 電圧 レベル, そして その後 調整 the gear to the 適切 gear aclying to the rough measurement results to make precise measurement.
It's very simple, use a mechanical multimeter, start from the maximum gear to measure, use AC gear and DC gear to measure, and if the AC gear can't be measured, the DC gear can measure it is direct current, and vice versa. In fact, the AC or DC can be judged through the device structure pin.
