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在数据采集技术中,迫切地需要高分辨率的A/D变换器,但是要制作微伏量级的A/D变换器是十分困难的。我们试用国产新型数字电压表与Z-80单板机相联,为微处理机在缓变过程中的微弱信号检测提供了数据采集手段。 HZ-1840型五位数字电压表系采用进口低温自稳零前置放大器和双积分型数字表集成电路,并配有恒温槽式稳压二极管,故该表具有很高的性能指标。最高分辨率为1微伏/字,采样速率为20次/秒、2次/秒,具有数据输
In data acquisition technology, the high-resolution A / D converter is urgently needed, but it is very difficult to make the A / D converter of the micro-volt level. We try out the new domestic digital voltmeter connected with the Z-80 single-board machine, which provides a means of data acquisition for the weak signal detection of the microprocessor in the process of gradual change. HZ-1840-type five-digit voltmeter uses imported low-temperature self-zeroing preamplifier and dual-integrated digital meter integrated circuit, and is equipped with a constant temperature tank voltage regulator diode, so the table has a high performance index. The highest resolution is 1 μV / word, the sampling rate is 20 times / second, 2 times / second, with data input