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地震台站的观测规范要求,地震记录图纸上的时号(脉冲信号)应位于记录图的固定位置。对于DD-1仪器,要求一个时号出现在记录图纸中间。对于DK-1仪器,要求两个时脉冲信号分别出现在图纸的1/4和3/4处。
The observational norms of the seismic stations require that the epoch (pulse signal) on the seismogram be located in a fixed position on the record. For the DD-1 instrument, a time code is required to appear in the middle of the record sheet. For the DK-1 instrument, two hourly pulse signals are required to appear at 1/4 and 3/4 of the drawing respectively.