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X线机限时器准确与否直接影响到X线照片的质量和X线管的使用寿命,所以对新安装或使用一段时间后的x线机限时器均应重新测量和校准。以往大型X线机的限时时间测量采用旋转陀螺感光法或高压电击火花法等。这些测量方法虽然准确,但非常麻烦,且浪费人力物力。我们制作的电子秒表,不但使用方便,而且迅速准确,颇受维修人员的欢迎。具体电路如图所示,由电源、整形,门控逻辑,计数译码和显示电路组成。整形电路包括D_5-D_6二极管和BG_2、BG_5三极管
The accuracy of the X-ray machine time-limiter directly affects the quality of the X-ray picture and the service life of the X-ray tube. Therefore, the X-ray machine time limiter after the new installation or use for a certain period of time should be re-measured and calibrated. In the past, large-scale X-ray machine time-limited measurement using gyro sensitive method or high-voltage spark sparks. Although these measurement methods are accurate, they are very troublesome and waste human and material resources. We make electronic stopwatch, not only easy to use, but also quickly and accurately, very popular with maintenance staff. Specific circuit as shown, from the power, plastic, gated logic, counting decoding and display circuit. Shaping circuit includes D_5-D_6 diode and BG_2, BG_5 transistor