【摘要】 目前,我国的模拟地震记录仪放大器只能工作于固定的放大倍数状态.稍为大些的地震发生便会出现“出格”现象,应用这些记录难以确定地震的震级,震中等参数.为了解决这一问题,我们设计了一种可以自动换挡的地震仪放大器.在通常的情况下,放大器工作于高放大倍数状态,一旦发生较大地震,放大器会自动衰减20dB,并保证记录的波形不会发生畸变.这一放大器全部由IC构成,放大器的各项参数指标比以前的放大器有较大的提高.更多还原

【Abstract】 Up to now, all the analog earthquake recorder,s amplifier can only work at a constant ratio in our country. When an earthquake which magnitude is slightly larger take place, the "over value" will be occured. In this case the parameters of the earthquake, such as the ceutre, the magnitude, will not be able determined.To save this problem, we devise an auto range amplifier. This amplifier usually works on a high ratio and when a large earthquakeoccurs, its amplifying gain can be automatically reduced by a 20 db.This amplifier is consisted of ICs ihoroughly and all the characters also have a great improvement.更多还原