Torque wrench calibration procedures

1. calibration of torque wrenches preparations
1.1 before the first use of the torque meter is fixed on the wall or on a level platform;
1.2 the torque meter power cable connected to the 220V power supply, turn the power switch on, Preheat for 20 minutes;2. periodical calibration
2.1 types of hydraulic torque wrench manufacturers time is 6 months;2.2 dial torque wrench
2.2.1 under be liable to join square drive wrench, choosing the right connection head insert the sensor hole, normal, peak torque meter switch to normal, torque meter track display function, rotate the zero potentiometer to zero point, fitted tested wrenches (should be zero before zero adjustment wrench insert).Note: after you insert the wrench, torque meter displays a certain value before without Afterburner, this value is generated by the wrench weight, can no longer be eliminated;

2.2.2 holding the handle of the wrench parts along the vertical direction flipping the wrench, uniform testing three points observation point by point the torque of the torque meter shows values and repeat 3 times.According to the following formula to calculate the present value relative errors (Q) and the relative variation in the indicating value (b), and fill in the result in the torque wrench calibration log sheet: q = (m – m) x100%
B=(Mmax―Mmin)×100%
In the formula: M-----testing torque value m---three times displays arithmetic mean Mmax----torque maximum torque Mmin----test display test three times three times display the minimum torque 2.2.3 calibration determination
2.2.3.1 the absolute value in Q and the b value ≤ 10% ≤ 10%, the torque to normal use;
2.2.3.2 Q the absolute >10% or b >10% should repair the torque wrench adjustment under the circumstances;Still not up to the required torque wrench adjusted scrap should be given;