How to solve the leak pressure of the pressure gauge calibrator

1. Check whether the pressure relief valve of the pressure gauge calibrator is closed
2. Check whether the stop valve of the pressure gauge calibrator has been opened
3. Please check whether the oil cup or water cup communicates with the atmosphere in the hydraulic pump
4. Remove the standard table and the tested table, plug the plug, and then perform the pressure test
5. Whether the pressure pump and the standard meter, the pressure pump and the meter to be checked have used the O-ring correctly, it is necessary to replace