Large weighing apparatus caribration instrument

The utility model relates to a calibrating apparatus of large weighing equipments, particularly for calibrating the measuring accuracy of an automobile electronic weighing equipment. The technical proposal of the utility model is that the calibrating apparatus is composed of a calibrating sensor (4), a display instrument (7), a pressing device and a pressurizing bracket (3); wherein the pressurizing bracket (3) is integrated with the base of the weighing equipment to be calibrated; the pressing device is fixed on the pressurizing bracket; the measuring precisions of the calibrating sensor and the pressurizing device are more than the measuring precision of the calibrated weighing equipment; the calibrating sensor is arranged on a balance body (9) of the weighing equipment to be calebrated; the calibrating sensor is connected with the pressurizing device through a ball; and the output of the calibrating sensor is connected with the display instrument. The pressure from the pressurizing device is pressed on the sensor and is displayed on the display instrument, at the same time, the pressure from the pressurizing device is pressed on the balance body of the weighing equipment to be calibrated and is displayed on the weighing equipment instrument, and then the measuring error of the weighing equipment to be calibrated can be ascertained through the comparison of the wo display values. Without weights, the utility model is facilitated to be applicable for calibrating large weighting equipments, and is characterized by reasonable structure and accurate and quick calibration.