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KC-400型X线机的限时器设计还是比较理想的。但它的结构较复杂,接线也有不够理想的地方。当机器的电源开关接通后,限时器的电源变压器即得电工作,使限时器一直处于曝光前的准备工作状态。这在摄影时是必要的,而在一般透视特别是在长时间透视时就没有这个必要了。限时器的电源变压器长时间通电,不仅限时器电路的无功消耗会使变压器发热,还会引起整流元件击穿而短路,烧毁限时器的电源变压器。我院在工作中已遇到这样的实际问题。为了解决这个
The time limiter design of the KC-400 X-ray machine is still relatively ideal. However, its structure is more complicated and wiring is not ideal. When the power switch of the machine is turned on, the power transformer of the time limiter is powered to make the time limiter always in a preparatory state before exposure. This is necessary in photography, but it is not necessary in general perspective, especially in long-term perspective. The power transformer of the time limiter is energized for a long time, not only the reactive power consumption of the timer circuit causes the transformer to generate heat, but also causes the rectifying element to break down and short-circuit, and burns the power transformer of the time limiter. Our school has encountered such practical problems in its work. To solve this