Load cell calibration requires standard weights, a weighing instrument, a multimeter, a sensor tester, auxiliary handling equipment, and recording tools. The specific configuration depends on the calibration scenario and accuracy requirements.
Core Calibration Tools
Standard Weights: Used to provide a known accurate weight and serve as the calibration benchmark. Weights matching the sensor's range must be selected (e.g., for a 1-ton range, use 200kg and 500kg standard weights in segments). The weights should be at least F2 grade and accompanied by a metrological verification certificate.
Weighing Instrument/Display Controller: Connects to the sensor and reads the output signal, supporting parameter settings such as zero point, range, and angle difference. Some intelligent instruments have automatic calibration functions, improving efficiency.
Multimeter or Dedicated Sensor Tester
Used to measure the sensor's input/output resistance and insulation resistance to determine if it is damaged.
High-precision multimeters can detect mV/V level signal changes, assisting in troubleshooting.
Standard weighing instrument (optional): In substitution calibration, a high-precision electronic scale is used to pre-calibrate the weight of the substitute (such as a forklift or counterweight) to ensure the accuracy of the equivalent load.