![]() ![]() The deviation in length from the zero of the test tape is measured by considering temperature correction and sag correction. The temperature of the two tapes is measured to account the temperature effect. The coincidence of scale marks is done by viewing the image of a CCTV camera which is coupled with a monitor. The tapes are properly clamped at the other end of the system against the pulling force of tension weights. The tension weights are used to stretch out the tapes up to appropriate tensions. This movement is measured by a digital dial gauge. In the measuring process the reference standard tape is moved with respective to the test tape by rotating a micrometer head. A reference and a test tape are laid horizontally by a series of horizontal supporters. This paper describes a mechanical method for calibration of steel length measuring tapes with a hook or hook-ring and lengths up to 10 m. ![]()
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