ARA地震仪放大器是一种集成化的可以自动换档的地震仪放大器。
The seismic amplifier of ARA type is a integrated amplifier which can be shifted automatically.
ARA的性能比分立元件组成的各类现用地震仪放大器性能有较大的提高。
Its performance score shows that the character of every kind of seismic amplifier which composed by the parts of ara has increased greatly.
鉴于测震中电子放大地震仪放大器的输出动态范围窄的缺陷，笔者作了自动换档衰减放大倍数的电路技术设计。
For overcoming the shortcoming of narrow output dynamic range of the electronic-amplifying seismograph, the Authors have designed a kind of circuit for automatic gain control.
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