How to check the rate of loading CBR. machine, Calibration of CBR machine or speed of CBR. machine 

Confirm the rate of loading CBR machine by using apparatus Dial gauge (0.01 mm) & stop watch.
Dial gauge use as penetrate plunger in mm. when dial gauge indicates complete one round read 1 mm , but completely 1.25 mm when indicator arrow completed 1 round and 0.25 mm in one minute
as per IS 2720 part 16 CBR MACHINE rate of loading 1.25 mm per minute.
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