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在修理国产409型心电图机时,经常遇到基线不稳和干扰等故障,这大都是内部电阻、电容失效变质或接触不良所引起;但是也有不少是电子管不对称不平衡所引起,特别是第一级二只6J8P的参数稍有不同,即出现干扰、基线不稳等故障现象.因此我们用了二十来元装制了一部适合409型心电图机的电子管配对仪,如图1.经使用颇能解决工作中实际问题,故提出以供参考.
In the repair of domestic 409-type ECG machine, often encountered baseline instability and interference and other failures, which are mostly caused by internal resistance, capacitance deterioration or poor contact caused; but there are also many caused by asymmetric tube imbalance caused, in particular The first two 6J8P parameters slightly different, that is, interference, unstable baseline phenomenon, so we used twenty yuan to install a suitable for 409-type ECG tube matching instrument, as shown in Figure 1. The use of quite able to solve practical problems in the work, it is proposed for reference.