检验平板检测重合度
Inspection and flat panel detector coincidence degree
划线平板介绍：
　　划线平板是用铸铁材料做成的平板，划线平板应采用优质细颗料的灰口铸铁或合金铸铁制造，是检验机械零件平面、平行度、直线度等形位公差的测量基准，也可用于一般零件及精密零件的划线、铆焊研磨工艺加工及测量等。常见加工方法为刮制法，刮制的划线平板工作面能贮存润滑油和容纳微小灰屑在凹坑中，提高了基准体现的可靠性与稳定性。
Crossed flat-panel description:
Dash tablet is a tablet made ​​of cast iron materials, crossed tablet should be used Fine granule gray cast iron or alloy cast iron, is the inspection of mechanical parts plane, parallel, form and position tolerances of straightness and other benchmarks, but also can be used for general parts and precision parts crossed riveting processing and measurement of the grinding process. Common processing method for the scraping method, crossed flat face scraping storage of lubricants and to accommodate the tiny gray debris in the pits, the benchmark reflects the reliability and stability.
测量不确定度分为三种 用水平仪或自准直仪检定平板平面度时，是按规定截面和检定点读取数据，通过数据处理获取平面度误差值。由于采用了多余观测，必然产生重复检定点。所谓重复检定点是受检稳各截面的交汇检定点，如平板中点是两条对角线、两条中线4个截面的交汇检定点，这一点即为重复检定点。从理论上讲，重复检定点的平面度值是不变的，即不同截面检定到这一点平面度值应相同。但是由于各个截面检定时受到基准、环境、仪器和操作等因素的影响，不可避免地带来检定误差，致使重复检定点所得平面度偏差值不重合。通常把不同截面重复检定点平面度偏差值的差值绝对值称为重复检定点平面度的重合度，简称重合度。显然，重合度表明重复检定点（重复点）的平面度偏差值符合程度（重复误差）
检验平板(5张)
Measurement uncertainty is divided into three level or autocollimator collimator test plate flatness is the required cross section and the test point to read the data, and data processing to obtain the flatness error. As a result of redundant observations, will inevitably produce a repeat test point. The so-called repeat the test point is the intersection test point of the subjects stable cross section, such as flat-panel midpoint of the two diagonals, the intersection test of the four sections of the two midline point, this point is to repeat the test point. In theory, the flatness value of the duplicate test points is unchanged, the different cross-section test to this flatness value should be the same. However, due to factors of the benchmark, the environment, instrumentation and operation of each cross-section test, inevitably bring test error, resulting in repeated test points obtained flatness deviation do not coincide. Usually the difference between the absolute value of the different cross-section and repeat the test point flatness deviation as a repeat test flatness of coincidence degree, referred to as the degree of coincidence. Clearly, the degree of coincidence that the flatness deviation of the repeat test point (repeated points) Relevance (repeat error)
Inspection plate (5)