Research on on-site automatic calibration technology for strain data acquisition system based on resistance increment ratio network

In the paper, the resistance increment ratio network and on-site strain gauge calibration technology are designed to be a multichannel programmable resistance standard analog variable calibrator, achieving automatic calibration of resistance strain data acquisition devices on site. It mainly focuses on the following three key technologies: controllability, multichannel capability, and on-site temperature compensation calibration used for resistance strain gauge calibration, to construct a fast automatic on-site calibration network consisting of a programmable multi-channel standard analog variable calibrator, the strain data acquisition device under calibration and a calibration computer. Through this network, the strain data acquisition device can be quickly and automatically calibrated on-site, meeting domestic calibration requirements of static/fatigue test benches and ensuring accurate measurement values in static/fatigue tests, traceability, and consistency.