“多次复盖”技术要求爆炸讯号是波形稳定,断点清晰的单阶脉冲,更要求讯号准确可靠。重庆仪器厂出产的DZC_1—24—66型磁带地震仪,由于应用双稳态线路,爆炸讯号可以满足波形稳定,断点清晰且为单阶脉冲的条件。但是,在野外工作中,我们发现爆炸讯号有不准的现象。于是我们对爆炸讯号做了一系列的检查工作和室内统计工作, “Multiple cover” technical requirements Explosion signal is stable waveform, a clear breakpoint single-pulse, but also requires accurate and reliable signal. Chongqing Instrument Factory produced DZC_1-24-66 tape seismometer, due to the application of bistable line, the explosion signal to meet the stable waveform, a clear breakpoint and single-pulse conditions. However, in the field work, we found the signal of the explosion was not allowed. So we did a series of inspections and indoor statistics on the signal of the explosion,