Multi-channel and high-accuracy data acquisition unit

The invention discloses a multi-passage and high precision data collector, belonging to data collectors. The data collector comprises a data collection module, a power module, a micro processor module, a stimulation measure module and a signal selection module, wherein, the signal selection module comprises a passage selection circuit, a current selection circuit, a bus and a function selection circuit, and the stimulation measure module comprises an amplification circuit, an A/D conversion circuit, an external reference source circuit and an optical coupling isolation circuit. The data collector has high system automation and intelligence and the precision as high as one thousand which is higher than the current industrial standard; also the testing function is widely universal and the collection passage is various.