Article 2 before measuring vibration every time you will need to calibrate the accuracy of standard vibration or checking the usage of standard vibration according to the user's manual that the manufacturer defined.
Article 2 prior to measurement of vibration at all times be accurate calibration of the meter, vibration, or audit the use of the meter, vibration, according to the manual provided by the manufacturer.
Article 2 before measurement of vibration time will need to calibrate the accuracy of standard a shudder or check the use of the standard vibration according to the manufacturer manual set.