When completing calibration of your load bars - the factory calibration will be reset and can not be retrieved.
You will need a known weight of at least 1/3 of the max weight calibration ie 500kg for a 1500kg calibration. This will provide the most accurate calibration and results. Less than 1/3 of max weight will not be as accurate when calibration is completed but will still work.
Here is a quick outline of the calibration process :
1. Prepare the scales for calibration: make sure your load bars are on a flat and level surface. Ensure there is no weight on the load bars.
2. Enter the calibration mode as per the provided PDF and video guide and zero calibrate the scales with no weight on the load bars.
3. Add a calibration weight onto the load bars - distributed evenly : The weight used should be a known, precise weight that is within the scale's capacity.
4. Confirm calibration: once the calibration weight is on the load bars, confirm and enter the weight into the system.
5. Remove the calibration weight: after the calibration weight is confirmed, remove the weight from the load bars.
6. Test the system : To ensure the system is now reading accurately, place the calibration weight back on the scale. The reading should match the known weight. If it doesn't, you may need to repeat the calibration process.
Make sure to read the guide a few times cover to cover to ensure you are comfortable with the calibration process.