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在产少关于SN338和国产DSC—481A、B的参考资料中都可见到对B格式所作的具体时间规定,如:PE=150ms,GEM=250ms,GMFE=20ms,…,GFC=150ms等等。倘若仔细对照一下仪器内部线路和有关逻辑方程就可发现,上述时间规定中,有两个间隙段的时间规定是欠妥的,这两个间隙段就是GEM和GFC段。虽然后来在石油工业出版社出版的《数字地震仪(下册)》一书中对此已给出了正确的结论:JX_(ts)段(即GEM)的长度不小于250ms,目前实际使用中一般为850ms左右;JX_(w)(即GFC)操作
For example, PE = 150ms, GEM = 250ms, GMFE = 20ms, ..., GFC = 150ms and so on can be found in the references of less SN338 and domestic DSC-481A, If we carefully check the internal circuit of the instrument and the relevant logic equation, we can see that there are two gaps in the above time rule that are not properly defined. The two gap segments are the GEM and GFC segments. Although later in the book “Digital Seismographs (Second Volume)” published by the Petroleum Industry Press, the correct conclusion has been reached that the length of the JX_ (ts) segment (ie, GEM) is not less than 250 ms and is currently in actual use Generally about 850ms; JX_ (w) (ie GFC) operation