9V能亮但未必是额定亮度。3V只是一个说法,元件有离散性。用至少12-14V电瓶供电,测电流的同时量电压。你那模拟表不知压降多少,数字表满度压降0.2V居多。
9V能亮但未必是额定亮度。3V只是一个说法,元件有离散性。用至少12-14V电瓶供电,测电流的同时量电压。你那模拟表不知压降多少,数字表满度压降0.2V居多。
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