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数字毫秒计是气垫导轨的重要附属计时仪器,它和光电门所组成的光控计时电路,具有较高的灵敏度.因而,实验前应仔细检查电源电压是否正常和测试光电门所属的光控电路是否有断路故障.以保证实验中毫秒
The digital millisecond meter is an important accessory timing instrument for the air-cushion guide rail and has a high sensitivity to the light-control timing circuit formed by the photoelectric door, therefore, it should carefully check whether the power supply voltage is normal and the light-control circuit under the test photoelectric door Is there an open circuit fault to ensure that the experiment milliseconds