ABSTRACT
The program to calculate coefficient of S type thermocouple a, b, and c is shown in Figure 3. The input of three fixed temperature points on verification certificate is realized by the Zn point, Sb point, and Cu point value inputting widget. In which widget, the subtraction operation widget
calculates differences between three fixed temperature points and standard reference table value, and the conditional construct and “Sb/Al switching” widget calculate the transforming from Zn point, Sb/Al point, and Cu point to their coefficients, which is achieved by formula node that is a flexible structure in LabVIEW programming, by which programmer can input one or more complex formulae directly. The language in formula node is similar to the C language. That is every
sentence is ended by a semicolon and is able to be commented, which takes the place of complex code drawing process. Consequently, formula nodes are applied to cases of vast computation and simply logic operation, which have strong readability.
