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今年七月,我室在使用国产《TSM-1》电镜中发现一例特殊故障,在高压系统十分正常的情况下,从荧光屏上观察时,图象边缘有明显的锯齿干扰,而且整个图象模糊(图1)。仔细观察分析,锯齿间距不随放大倍率和工作方式的改变而变化。进一步根据锯齿间距帧频粗略估算,频率约为70Hz左右固定不变。因此断定,是电源频率(50Hz)干扰。经查明,其原因是帧扫描功放电源的稳压系统中,1/2w8C稳压二极管损坏,结
In July this year, I found a special case of “TSM-1” electron microscopy in our room. When the high-voltage system is very normal, there is obvious saw-tooth interference at the edge of the image when viewed from the screen and the entire image is blurred (figure 1). Careful observation and analysis, the sawtooth spacing does not vary with the magnification and work changes. Further based on the jagged pitch frame rate roughly estimated frequency of about 70Hz fixed. Therefore concluded that the power frequency (50Hz) interference. It is ascertained that the reason for this is that in the regulator system of the frame-scanning power amplifier, the 1 / 2w8C zener diode is damaged and the junction