Abstract
The fundamental modern intelligent instrument is signal detection and analysis technology. Although it is the classic content of intelligent instruments, the noise analysis technology, the weak signal detection technology developed largely in many test fields. Therefore, in Chapter 2, the structure principle of data acquired system, the noise analysis technology, and the weak signal detection technology are introduced.
Keywords: Analog to digital converter, Boxcar integrator, Data acquired system, Lock-in amplifier, Multiplexer, Noise, Structure principle, Sample and hold, Simulation, The adaptive filter.