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在检修彩电“三无”故障时,维修人员常在开关电源+B输出端接入“假负载”,以判断故障部位,采用白炽灯泡做假负载的较多。维修实践证明,采用灯泡假负载的检修方法有时并不妥当,甚至会出现误判,而采用线绕大功率电阻做“假负载”最理想。为什么说采用灯泡做假负载不太合适呢?因为灯泡灯丝阻值有冷热值的差异,在未通电时,其灯丝电阻
In the maintenance of color TV “three no” fault, maintenance personnel often switch power supply + B output access “false load” to determine the fault location, the use of incandescent bulbs do more false load. Maintenance practice has proved that the use of bulb false load maintenance methods are sometimes inappropriate, and even misjudgment, and the use of wire wound high-power resistors do “fake load” the best. Why do you say that the use of bulbs do not make it suitable for false load? Because the bulb filament resistance value of the difference between hot and cold, when not energized, the filament resistance