The Zero Check and Error Verification of Infrared Level Meter
Zero check
The deviation of the bubble from the middle position should not exceed 1/4 of the graduation value. The zero position inspection of the lower working face of the spirit level can be carried out on the zero-level plate, or on the level meter calibration instrument; the zero position inspection of the lower V-shaped working face of the level meter should be carried out on a special tool; for the frame level meter The zero position of the upper plane working surface, the upper V-shaped working surface, the side plane working surface and the side V-shaped working surface should also be carried out on special tools.
The stability of the zero position of the level meter requires that after the zero position of the lower working face is verified, the zero position shall be verified again at an interval of 4 hours, and the change shall not exceed the allowable range of the zero position deviation.
error detection
It should be carried out on a level meter calibrator. The difference between the measured average angle value and the nominal angle value shall not exceed 10% of the nominal angle value. The unevenness of the graduation value should not exceed 20% of the graduation value. That is, the difference between adjacent readings is within the range of 0.8 to 1.2 grids. The verification of the division value error of the level meter should be carried out on the left and right scales of the bubble. In order to eliminate the influence of the dead distance of the micro-motion screw of the level meter calibrator, the micro-motion screw should be rotated in one direction.
