指针式仪表在光线不足或暗处工作时没有照明,读数非常困难。为解决这一问题,我们为指针式仪表加装了照明灯,经实验效果十分满意。灯的位置如图1。我们在指针式仪表针档外侧分别开一对称圆孔,内径等于用发光二极管LED作指示灯外径(加工时注意不要将表盘划伤或损坏,钻孔后的铁屑一定要清扫干净),将指示灯针脚穿出后表壳,用“704胶”固定后,接好电路,改装工作即可结束。经改装后的指针式仪表,可用于光线不足的工作环境,在距离仪表二、三m处可以清晰地看清表盘。 Pointer instrument in the light of dark or dark work without lighting, reading is very difficult. In order to solve this problem, we have installed the illuminator for the pointer instrument, and we are very satisfied with the experimental result. The location of the lamp is shown in Figure 1. We open a symmetrical circular hole on the outer side of the pointer instrument needle, the inner diameter is equal to the light-emitting diode LED indicator light (pay attention not to scratch or damage the dial after drilling, iron must be cleaned after drilling) The indicator pin piercing the case, with “704 plastic ” fixed, then a good circuit, the conversion can be completed. The modified pointer instrument, can be used for low-light working environment, in the distance meter two, three m Department can clearly see the dial.