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在目前所用的较高级的三管摄像机中,如日本SONY公司生产的DXC-M3P三管摄像机,除了具有一个电源总开关外,还有一个预热开关。之所以要附加这个预热开关,是由摄像机内摄像管的工作机理所决定的。摄像管正常工作前,要求摄像管的灯丝先供电预热,这样,一方面可以延长摄像管的寿命,另一方面也可以使摄像管在开始工作时就处于正常工作状态。因此,我们在使摄像机工作时,总是先开启电源总开关,使12V外接蓄电池供电电源电压或录像机提供的电源接通以给摄像机供电。这时,摄像管灯丝已通电预热,机器处于预热状态。约过半分钟,再开启预热开关,这时摄像机的光圈打开,各电路供电正常,摄像机
In the currently used advanced three-tube cameras, such as Japan’s SONY’s DXC-M3P three-tube camera, in addition to having a power switch, there is a preheat switch. The reason why the preheat switch is attached is determined by the working mechanism of the video camera in the camera. Before normal operation of the camera tube, the filament of the camera tube is required to be preheated first, so that the life of the camera tube can be prolonged on the one hand and the camera tube can be in a normal working state at the beginning when it starts to work. Therefore, when we make the camera work, always turn on the main power switch, so that 12V external battery power supply voltage or video recorder to provide power to the camera power supply. At this time, the camera tube filament has been preheated, the machine is in a warm state. About more than half a minute, and then turn on the preheat switch, then open the camera aperture, the circuit power supply is normal, the camera