Campbell-scientific CR9000X Measurement and Control System Manuel d'utilisateur Page 209

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Section 6. Data Table Declarations and Output Processing Instructions
Maximum (Reps, Source, DataType, DisableVar, Time)
This instruction stores the Maximum value that occurs in the specified Source
variable over the output interval. Time of maximum value(s) is Optional
output information, which is selected by entering the appropriate code in the
time parameter. NANs are ignored by this output processing instruction.
Parameter
Enter
MAXIMUM PARAMETERS
Reps
Constant
The number of maximum values to determine. When repetitions are greater than 1, the source must be
an array..
Source
Variable
The name of the Variable that is the input for the instruction.
DataType
A code to select the data storage format. Read More: See Section 4.2.4.4 Data Types
Constant
Alpha Code Numeric Code Data Format
IEEE4 24 IEEE 4 byte floating point
FP2 7 Campbell Scientific 2 byte floating point
UINT2 21 2 Byte unsigned integer
Long 20 4 Byte Integer value
DisableVar
Constant,
Variable, or
A non-zero value will disable intermediate processing. Normally 0 is entered so all inputs are processed.
For example, when the disable variable is 0 the current input is not checked for a new maximum. The
maximum that is eventually stored is the maximum that occurred while the disable variable was 0.
Expression
Value Result
0 Process current input
0
Do not process current input
Time
Option to store time of Maximum. When time is output, the maximums for all reps are output first
followed by the respective times at which they occurred.
Constant
Value Result
0 Do not store time
1 Store time Time of max is stored in the NSec format.
Median
The Median instruction stores the median value over time of a variable to an
output table.
Syntax
Median(Reps, Source, MaxN, DataType, DisableVar)
Remarks
Median is an output instruction that is included within a data table declaration.
Each time the DataTable is called and the DisableVar is False, the current
Source value is stored to an array in internal memory. This array is
dimensioned with MaxN number of elements. Therefore, no more than MaxN
values are retained in memory. If MaxN + 1 number of stored values is reached
before the DataTable output is triggered, then the oldest stored value in the
array will be discarded.
When the DataTable's output condition is True, the instruction outputs the
Median of the values in memory to the DataTable, and then memory for the
instruction is cleared. If the number of values for which the median is
calculated is an even number, the two median values will be averaged.
NANs and +
INFs are considered to be the most minimum values in the
determination of the Median.
6-25
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