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我们在使用上海地质仪器厂生产的DZ71型磁带地震仪中发现,如果混波开关在通的位置时,在回放到井口、爆炸、计时讯号时,就出现严重的干扰,使井口爆炸讯号无法辨认;而混波开关在断的位置是时,回放出来的井口爆炸记时讯号却很好。我们认为造成这种现象的主要原因是由于加混波时,解调Ⅰ、解调Ⅱ、解调Ⅲ输出口通过混波继电器和混波电阻接在一起,但这时只有解调Ⅱ接井口、爆炸、计时磁头,有800赫调宽方波输入,而解调Ⅲ和解调Ⅰ输入口悬空,造成感应讯号较大,解调Ⅱ输出的录制讯号和解调Ⅰ、解调Ⅲ输出感应讯号迭加在一起,因而井口爆炸计时讯号不好。
We use the Shanghai Geological Instrument Factory produced DZ71 tape seismometer found that if the mixing switch in the pass position, the playback wellhead, explosion, timing signal, there is a serious interference, so that the wellhead explosion signal can not be identified ; While the hybrid switch in the broken position is, the wellhead explosion playback time signal is very good. We believe that the main reason for this phenomenon is due to the addition of mixing, demodulation Ⅰ, demodulation Ⅱ, demodulation Ⅲ output port through the hybrid relays and mixed resistors together, but this time only demodulation Ⅱ connected wellhead , Explosion, timing head, with 800 Hz widening square wave input, and demodulation Ⅲ and demodulation Ⅰ input port vacant, resulting in a large sense signal, demodulation Ⅱ output of the recording signal and demodulation Ⅰ, demodulation Ⅲ output sensing Signal superimposed together, so wellhead explosion timing signal is not good.