Campbell Scientific CR3000 CR3000 Micrologger - Page 146
CRBasic Example 18., Use of Expressions in Arguments
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Section 7. Installation Table 20. Rules for Names Name Category1 Data-table name Maximum Length (number of characters) 20 Allowed characters and other names. Field name 39 Field-name description 64 1Variables, constants, units, aliases, station names, field names, data table names, and file names can share identical names; that is, once a name is used, it is reserved only in that category. 7.7.3.8.4 Expressions in Arguments Read More! See Expressions (p. 147) for more information on expressions. Many parameters allow the entry of arguments as expressions. If an expression is a comparison, it will return -1 if the comparison is true and 0 if it is false (Logical Expressions (p. 150) ). CRBasic example Use of Expressions in Parameters (p. 146) shows an example of the use of expressions in arguments in the DataTable() instruction, where the trigger condition is entered as an expression. Suppose the variable TC is a thermocouple temperature: CRBasic Example 18. Use of Expressions in Arguments 'DataTable(Name, TrigVar, Size) DataTable(Temp, TC > 100, 5000) When the trigger is "TC > 100", a TC temperature > 100 will set the trigger to true and data are stored. 7.7.3.8.5 Arrays of Multipliers and Offsets A single measurement instruction can measure a series of sensors and apply individual calibration factors to each sensor as shown in CRBasic example Use of Arrays as Multipliers and Offsets (p. 147). Storing calibration factors in variable arrays, and placing the array variables in the multiplier and offset parameters of the measurement instruction, makes this possible. The measurement instruction uses repetitions to implement this feature by stepping through the multiplier and offset arrays as it steps through the measurement input channels. If the multiplier and offset are not arrays, the same multiplier and offset are used for each repetition. Read More! More information is available in CRBasic Editor Help topic "Multipliers and Offsets with Repetitions". 146
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