元素直接测量：通过测量机采点获得元素的测量数据（或者脱机编程鼠标采点），如果在测量该元素时没有输入该元素的理论值，则RationalDMIS 2020自动把理论值设置等同于测量值。
RationalDMIS 2020 脱机编程 2021（图文+视频）最详细
RationalDMIS 2020 自学习编程详解（图文并茂+视频）
为什么在数模上测量点的时候，理论值和实际值一样？
在数模上测量点，如果是直接点取CAD上的点测量，那么第一遍测量的点的数据理论值和实际值相等，因为第一遍测量的点没有理论值，所以系统把测得的实际值赋给了理论值。
附注：
用户可以把第一遍测量得到的点拖放到测量窗口重新测量，之后测量的点的实际值和原来点的理论值就会有差别。
或者在测量点之前，先在元素定义窗口根据图纸定义一个理论点，然后再测量次理论点的实际值，这样测得的实际值和理论值也不一样。
RationalDMIS 7.1 数模编程 （PDF文档下载）
RationalDMIS点的数模比对测量（手动快速比对测量）
RationalDMIS还可以实现测量的元素与CAD数模实时比对：
在测量元素之前，把CAD数模拖放到“找到理论”窗口，再去测量，这样在测量时，软件会自动进行CAD理论值和实际值的比对。
$$/* Header
DMISMN/'Created by [爱科腾瑞科技(北京)有限公司-091521-DEMO-11022(华清)] on 星期二, 三月 30, 2021', 4.0
UNITS/MM, ANGDEC, MMPS
WKPLAN/XYPLAN
PRCOMP/ON
TECOMP/ON
FLY/1.0000
MODE/MAN
SNSET/APPRCH, 2.0000
SNSET/RETRCT, 2.0000
SNSET/DEPTH, 0.0000
SNSET/SEARCH, 10.0000
SNSET/CLRSRF, 20.0000
RECALL/D(MCS)
SNSLCT/S(40-D2)
GEOALG/BF, LSTSQR
GEOALG/ANGLB, DEFALT
GEOALG/CIRCLE, LSTSQR
GEOALG/ARC, LSTSQR
GEOALG/PLANE, LSTSQR
$$
$$
$$*/
F(PLN1)=FEAT/PLANE,CART,31.4322,36.5554,0.0000,0.0000,0.0000,1.0000
$$ Measurement points are created through nominal points
MEAS/PLANE, F(PLN1), 4
PTMEAS/CART, 4.0588, 61.9406, 0.0000, 0.0000, 0.0000, 1.0000
PTMEAS/CART, 4.8097, 10.4780, 0.0000, 0.0000, 0.0000, 1.0000
PTMEAS/CART, 59.6909, 6.8849, 0.0000, 0.0000, 0.0000, 1.0000
PTMEAS/CART, 57.1692, 66.9182, 0.0000, 0.0000, 0.0000, 1.0000
ENDMES
F(LN1)=FEAT/LINE,BND,CART,5.9442,0.0000,-1.4322,62.6504,0.0000,-2.2864,0.0000,-1.0000,0.0000
$$ Measurement points are created through nominal points
MEAS/LINE, F(LN1), 2
PTMEAS/CART, 5.9442, 0.0000, -1.4322, -0.0000, -1.0000, -0.0000
PTMEAS/CART, 62.6504, 0.0000, -2.2864, -0.0000, -1.0000, -0.0000
ENDMES
F(PT1)=FEAT/POINT,CART,0.0000,4.5840,-2.7067,-1.0000,0.0000,0.0000
MEAS/POINT, F(PT1), 1
PTMEAS/CART, 0.0000,4.5840,-2.7067,-1.0000,0.0000,0.0000
ENDMES
D(CRD1) = DATSET/FA(PLN1), ZDIR, ZORIG, FA(LN1), XDIR, YORIG, FA(PT1), XORIG
D(CRD1) = TRANS/ZORIG, -0, YORIG, -0, XORIG, -0
$$ Set.CAD2PCS.CADM_1