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自动检测装置所检测的直流信号变化范围比较小(多在0～50mv),在模数转换器中,为了控制鉴别器,毫伏信号一般都通过斩波(或双通道)式数据放大器进行放大,因直接耦合式放大器达不到要求。数据放大器灵敏度很高,分辨能力在微伏级,所以是非常怕干扰的电子部件;而且被测信号从测点A到检测装置一般相距几十米远,所以信号线的途径以及装置的工作环境,
Automatic detection device detects the DC signal range is relatively small (mostly in 0 ~ 50mv), in the analog-digital converter, in order to control the discriminator, the millivolt signal is generally amplified by chopper (or dual-channel) type data amplifier , Due to direct coupling amplifier can not meet the requirements. Data amplifier high sensitivity, resolution in the micro-volt level, so it is very afraid of interference with electronic components; and the measured signal from the measuring point A to the detection device generally tens of meters away, so the signal line and the device working environment ,