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鉴于 DD—1地震仪报警器在报警灵敏度调高时普遍存在抗干扰能力下降的现象(如开关日光灯、收音机等电器时会导致假报警),因此,在实际使用时灵敏度不可能调得很高,一般在记录幅度大于20mm 才能报警。而且对于黄土覆盖较厚地区的台站,因地震波高频部分已衰减,以及受报警器频率特性范围的限制,所以往往记录幅度很大也不能报警,以致贻误震情。为此,我们对 DD—1地震仪报警器作了简易的改装,现将改装方法作一简单介绍,以供参考。
In view of the common anti-interference ability drop of DD-1 seismograph alarm (such as switching fluorescent lamp, radio and other electrical appliances will lead to false alarm) when the alarm sensitivity is raised, so the sensitivity can not be adjusted very high in actual use , The general record in the range of greater than 20mm alarm. Moreover, for stations with thick loess areas, because the high-frequency part of the seismic wave has been attenuated and is limited by the range of the frequency characteristics of the alarm, the recorded amplitude is often too large to alarm so as to deladen the earthquake. For this reason, we made a simple modification to the DD-1 seismograph alarm. Now we will make a brief introduction of the modification method for reference.