The method used a portable radiation meter, inside the instrument using two high range and low range, high and low range of the measurement process is the key technology automatically converted. Conventional circuit using anodic conversion, high - voltage relays or other high - voltage switching device, The method uses cathode conversion circuit, the circuit by the transistor, low - voltage normally relay, The circuit has low voltage switch, high reliability, low power consumption.%该方法用于一种便携式辐射测量仪,仪器内部使用两个高低量程卤素计数管,测量过程中高低量程自动转换是其关键技术.常规方法采用阳极转换,需要高压继电器或其他高压开关器件,该方法采用阴极转换电路,电路由三极管、低压常闭干簧管继电器、阴极信号采集电路组成,该方法相比常规方法具有低压切换、切换可靠性高、低功耗的优点.
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