Calibration method of magnetic particle flaw detector
1 Visual inspection The accessories are complete, there must be no hard bumps and changes in appearance, and all fasteners must not be loose or fall off.
2 Allow power supply voltage fluctuation range verification.Connect the voltmeter and voltage regulator between the power supply and the flaw detector, adjust the voltage regulator so that the indicated value of the voltmeter fluctuates within ±10% of the rated voltage (220V), and check whether the instrument is normal work.
3 Lifting force verification Put the instrument in good contact with the test block, press the power button to test the lifting force.
4 Sensitivity verification Select market black magnetic powder paste and prepare magnetic suspension according to the instructions. Choose the A-30/100 type magnetic particle testing powder sensitivity test piece, stick it on the test block according to the standard requirements, pour the magnetic suspension while energizing, and check the magnetic marks of the test piece.
5 Use a 500V megohmmeter to check the insulation resistance of the low-voltage circuit to test the insulation of the control box cable head to the shell