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黑白电视接收机在常温下的质量,是由42项电、光、声技术参数描述的。技术参数测量结果的可信度,取决于电视机测试过程中能否维持标准测量条件。而标准测量条件中常常出问题的地方是,测量过程中电视机不能保持准确调谐点。根据第四机械工业部部标准《黑白电视广播接收机的测量方法》(SJ 949-75)规定,二级机的偏差不得超出±300千赫。如果超出
The quality of black and white TV receiver at room temperature, is described by the 42 electrical, optical, acoustic technical parameters. Technical parameters The reliability of the measurement results depends on whether the standard measurement conditions can be maintained during the testing of the TV set. The standard measurement conditions are often the problem is that the TV can not be measured during the process of maintaining accurate tuning point. According to the Fourth Machinery Industry Standard “Measurement Method for Monochrome TV Broadcast Receivers” (SJ 949-75), the deviation of the second-class machine shall not exceed ± 300 kHz. If exceeded