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灵敏电流计(俗称“表头”)在搬运过程中,如用一根导线把正、负接线柱短接,就能对表头指针起到一定的保护作用。这是因为一般的灵敏电流计均系磁电式电表,主要由蹄形磁铁和放置在蹄形磁铁两极间的线圈(动圈)组成,当表头不与其他任何仪器相接时,其线圈电路是非闭合状态。这样,当表头在搬运过程中受到碰撞或震动时,其指针会因惯性而左右摆动,摆幅大且很久不停以至受损。用导线将
Sensitive galvanometer (commonly known as “head”) in the handling process, such as using a wire to short the positive and negative terminals, can play a certain degree of protection on the head pointer. This is because general sensitive ammeters are magnetoelectric meters. They mainly consist of a hoof magnet and a coil (moving coil) placed between the two poles of the hoof magnet. When the meter head is not connected to any other instrument, the coil The circuit is in a non-closed state. In this way, when the watch head is impacted or vibrated during transportation, the pointer will swing from side to side due to inertia, and the swing will be large and will not be stopped for a long time. With wire will