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当磁鼓表面以结露形式出现潮气时,将使磁带与磁鼓之间的摩擦系数剧增,造成走带不稳,产生严重的时基误差,甚至会使磁鼓停转。为了防止由于摩擦系数的增加而引起磁带和磁头的损伤,录象机内部设有结露检测电路。检测电路如图1(图1中元件的编号按NV-450/NV-250机的编号),潮湿传感器的特性曲线如图2。约为0.4V的基准电压由R_(6004)、R_(6005)、R_(6006)分压得到并加到运放的反相输入端。当湿度低于98%时,由于潮湿传感器的电阻值小,所以运放的同相输入端电压低于基准电压,运放的输出端输出低电位。此时录象机的各个功
When moisture appears on the drum surface in the form of dew condensation, the coefficient of friction between the tape and the drum increases sharply, resulting in unstable tape transport, severe timing error, and even spinning of the drum. In order to prevent the magnetic tape and the magnetic head from being damaged due to the increase of the friction coefficient, the condensation detecting circuit is provided inside the video recorder. Detection circuit shown in Figure 1 (Figure 1, part number by NV-450 / NV-250 machine number), wet sensor characteristics shown in Figure 2. About 0.4V reference voltage R_ (6004), R_ (6005), R_ (6006) partial pressure and added to the inverting input of the op amp. When the humidity is less than 98%, the humidity sensor’s resistance is small, so the non-inverting input voltage of the op amp is lower than the reference voltage, and the output of the op-amp outputs a low voltage. VCR at this time the various functions