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--- en:infra-convert:user:terms [2019/10/02 14:13]
me [Measurement (sizes-)]
+++ en:infra-convert:user:terms [2019/10/08 14:51]
me
@@ Line 31: / Line 31: @@
  **M**\\
  • [[en:infra-convert:user:terms#Measurement (sizes-)]]\\
+ **N**\\
+ • [[en:infra-convert:user:terms#Numerical precision]]\\
  **P**\\
  • [[en:infra-convert:user:terms#Project]]\\
  **S**\\
+ • [[en:infra-convert:user:terms#Simplified indications]]\\
  • [[en:infra-convert:user:terms#Specification operators and modifiers (ISO GPS)]]\\
  • [[en:infra-convert:user:terms#Stamp/stamps]]\\
@@ Line 616: / Line 619: @@
 | NIST-19: National Institute of Standards and Technology, Gaithersburg, Maryland, USA: NIST Handbook 44 : Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices (Appendix C. General Tables of Units of Measurement) 2019.\\ *¹ Available from program version 1.2.0.23\\ *² Available from program version 1.3.9.5\\ *³ Available from program version 1.3.9.8 |||||
+\\
+----
+\\
+==== Numerical precision ====
+The numerical precision is relevant for the representation of numerical values. If a technical fact is described with numerical values, usually in the form of physical quantities or →[[en:infra-convert:user:terms#measurement_sizes|measurement sizes]], the
+accuracy of the displayed number should be in the same order of magnitude as the inaccuracy of the measure itself.
+For example, the maximum inaccuracy range of the value 23, if no further information is available, is 22.5 to <23.5. Finally, the value may have resulted from a rounding operation. The last significant digit, here the "3", is the digit that was rounded or may have been rounded.
+|< 100% 15% 15% 30% 25% 15% >|
+^  Value  ^  Number of relevant digits  ^  Rounding range (absolute inaccuracy range)  ^  Size of the absolute inaccuracy range  ^  Size of relative inaccuracy  ^
+|  2**3**  |  2  |  22,5 to <23,5  |  1  |  4,35 %  |
+|  2,**3**  |  2  |  2,25 to <2,35  |  0,1  |  4,35 %  |
+|  23,**0**  |  3  |  22,95 to <23,05  |  0,1  |  0,435 %  |
+|  2**3**00  |  2  |  2250 to <2350  |  100  |  4,35 %  |
+|  0,00023**0**  |  3  |  0,0002295 to <0,0002305  |  0,000001  |  0,435 %  |
+The number of significant or relevant digits in a decimal number can be identified as follows (see also "DIN EN ISO 80000-1:2013-08, Chapter 7.3.4 Deviation and uncertainty"):
+  - The number is viewed from left to right. The first non-zero digit is the first relevant digit.
+  - Following zeros are also relevant, especially if they are to the right of the decimal point.
+  - Zeros to the left of the comma are only relevant if at least one other digit, including zero, follows to the right of the comma.
+The numerical accuracy common in technology ("slide rule accuracy") is achieved by rounding a value so that three significant digits remain. Unless the first significant digit is a one, four significant digits should remain.
 \\
@@ Line 642: / Line 672: @@
 Even if it is technically possible, a project should always only refer to an object that is subject to a test and, if necessary, follow-up tests. This may be, for example, the initial sampling of a product and its subsequent re-sampling (first-piece approvals, requalifications).
+\\
+----
+\\
+==== Simplified indications ====
+By using a **simplified specification**, requirements for a geometry element are specified in simplified form and explained elsewhere in the drawing, for example next to a view or near the title block. This type of specification can be useful if there is not enough space available in a view or if a specification applies to several separate geometry elements and is specified more than once.
+The following example shows the principle for surface specifications and geometric tolerance specifications.
+{{ :en:infra-convert:user:terms:vereinfachte_angaben.png?nolink&600 |}}
 \\

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