八一年全国电视机质量评比时,抽查三十五家生产厂的700只3DG102小功率管,高温失效率达12.4%,其中一半以上是由于该管反向饱和压降Vces变化过大所致。其后果是电视机图象产生热抖动,影响收看效果。上海测试技术所用离子探针、电子能谱、扫描电镜对决定 During the National Television Quality Competition in 1981, a sample of 700 low-power 3DG102 tubes from 35 manufacturing plants was spot-checked at a high temperature failure rate of 12.4%. More than half of these were due to excessive changes in Vces of the tube in the reverse saturation voltage drop . The consequence is that the TV images produce heat jitter, affecting the viewing effect. Shanghai test techniques used by ion probes, electron spectroscopy, scanning electron microscope to decide