Dimensional measurement refers to the measurement of length. is the most basic measurement, and the most commonly used tool is a scale. Other tools for length measurement include gauges, gauges, and gauges.
Before using the scale, pay attention to observe the scale mark, measuring range, and graduation value. When using, it should be noted that the ruler should be placed along the measured length, and the edge of the ruler should be aligned with the measured object, which must be placed in a positive and overlapping manner, and should not be skewed. Do not use worn zero tick marks, such as taking another whole tick mark as a zero tick due to zero tick wear, do not forget to subtract the replaced zero tick value from the last reading.
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Measurement error. The error is the measured value of the measurement minus the reference value. The measured value is referred to as the measured value, which represents the measured value. The so-called reference value is generally expressed by the true value of the quantity or the agreed value of the quantity.
Dedicated measuring tools.
It is only suitable for measuring the size, surface roughness, shape and position error of a specific product workpiece. The common ones are three precision coordinate measuring instruments, image measuring instruments, industrial CT measuring machines and microscope electron microscope inspection devices.
Measuring instrument