Method for field calibration of float-type level meter

The invention provides a method for field calibration of a float-type level meter. According to the method, mechanical traction instead of a float is used to change the displacement of a suspension cable, so as to simulate the change of a water level in a field environment. During calibration, the number of rotations of a coded disc in a level change process is measured by a high-precision rotaryencoder, the perimeter of the coded disc is calculated, and the perimeter is multiplied by the number of rotations to obtain a level change. As length displacement measurement is converted to angulardisplacement measurement, the measurement is precise, and the operation is simple and convenient. The method of the invention can be used for periodic adjusting of the float-type level meter during work, so as to effectively guarantee the accuracy of monitored data during the whole life cycle of the float-type level meter, fill the blank of field inspection of the float-type level meter, and solvethe instrument calibration