Will my Clegg arrive already calibrated?

Question Last Updated on: 8/22/2023

The Clegg unit is calibrated before shipment. The reading however will differ from one location to another. To determine the calibration pad value for the first time, carry out a modified Clegg Impact Test procedure to obtain six readings on a suitable surface, preferably one that is at an easily accessible ?home? location. This same location should be used for all future operational checks.

For a home site, select a firm solid base such as a bare concrete slab floor. Be sure that the surface is smooth, dry and clean and that the surfaces of the calibration pad and hammer strike face are dry and free of any foreign material. Place the pad under the guide tube such that the hammer is centered on the pad. The pad must be between the hammer and floor. The hammer must fully strike the calibration pad and not the floor.

Take the average of the six drops to obtain the calibration value and document this value. During future operational checks, make note of the value and compare those values to the original baseline values. The average reading should agree with the logged value and be within +/- 2 CIV or 20g. Also, mark or paint a line on the area of the concrete slab to show the area where the calibration check will be performed. This way, the same area is used to ensure consistency.

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