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国产XG200型X线机使用的是JSB—23型晶体管限时器。为了提高工作可靠性,该限时器设置了两套控对电路。如图1所示,正常情况下,曝光结束是由主控限时电路中的开关管下来控制的。当主控限时电路出了故障,即下由于某种原未来能及时翻转为截止状态时,稍后,开关管T_2受晶闸管SCR控制而翻转为截止状态,由第二套控时电路断开限时继电路J的工作电路,从而控制曝光结束。 然而,在实际使用中,往往不容易判断曝光结束到底
Domestic XG200 X-ray machine uses a JSB-23-type transistor timer. In order to improve the work reliability, this limit timer has set two sets of control circuit. Shown in Figure 1, under normal circumstances, the end of the exposure is controlled by the main switch control circuit time down. When the main control circuit is out of order, that is, under some kind of original future can be overturned for the off state in time, later, the switch T_2 controlled by the thyristor SCR and turned off for the off state by the second set of control circuit off time limit Following the working circuit J circuit, thereby controlling the end of exposure. However, in actual use, it is often not easy to judge the end of exposure