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在日常透视工作中,某些操作者往往不自觉地延长无益的曝光时间。这无论从防护观点还是从X线管使用的寿命来看都是不利的。为此,我们用一个多谐振荡器作为透视曝光自控器代替脚闸。效果较好。多谐振荡器的周期取决于两组电阻电容各自的乘积,无论改变哪组的电阻R或电容C的数值,其振荡周期均会发生相应改变。我们将C_1、R_1、W_1这组设为曝光组,时间在1～8秒范围内,将C_2、W_2这组设为间隙组,时间在0.2～0.5秒之间。照图安装完毕后,仅需调整W_1即可使用。除电位器W和电源
In the daily work of perspective, some operators tend to unconsciously extend unprofitable exposure time. This is disadvantageous both in terms of protection and lifetime of the X-ray tube. To this end, we use a multivibrator as a perspective exposure control instead of foot brake. The effect is better. Multivibrator cycle depends on the product of the two groups of resistance and capacitance, no matter which group changed the resistance R or capacitance C value, the oscillation period will be changed accordingly. We set C_1, R_1 and W_1 as the exposure group in the range of 1 to 8 seconds, and set the groups C_2 and W_2 as the gap group in 0.2 to 0.5 seconds. After installation, just adjust W_1 to use. Remove potentiometer W and power supply