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FH-408型自动定标器从1970年投产以来,已销售了几千台。目前,这种仪器已广泛应用在全国各地不少工厂、学校、医院、部队和科研部门。根据我们的实践经验和用户反映,常见故障主要有下面几个情况。 一、晶体管损坏 1975年前生产的仪器中,晶体管3DG404A损坏率较高。该管在仪器中只作开关用,使用电压低于60伏,没有特殊要求。该管生产厂北京前门器件厂通
FH-408 automatic scaler since its commissioning in 1970, has sold thousands of units. At present, this instrument has been widely used in many factories throughout the country, schools, hospitals, military and research departments. According to our practice and user experience, there are several common faults the following situations. First, the transistor damage 1975 before the production of equipment, transistor 3DG404A higher damage rate. The tube in the instrument only for switching purposes, the use of voltage below 60 volts, there are no special requirements. The tube factory Beijing Qianmen Device Factory pass