Experimental device for testing measurement precision of card measuring instrument sensor

The invention discloses an experimental device for testing the measurement precision of a card measuring instrument sensor. The experimental device mainly comprises a base, a first support, a second support, a supporting frame, a vernier disc, a main nut, a driving shaft, a dial, a shaft assembly for tension detection, a shaft for rotation detection, an adapter and a spring. The first support, thesecond support and the supporting frame are all fixed to the base, the vernier disc is fixed to the left side of the supporting frame, the main nut is arranged on the supporting frame from the rightside in a sleeving mode, the spring and the dial are arranged on the right side of the driving shaft and penetrate through the vernier disc to be connected with the main nut, and the two sides of thedetection shaft are connected with the driving shaft and the adapter respectively. The card measuring instrument sensor is fixed on the first support and the second support, and a sensor lower joint is connected with the adapte