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In the NPI Process Definition window, when you add a Numeric Data Collection Activity or a Numeric Data Range Collection Activity to a process definition, you can specify control limits on the Activity Details tab. Min Value and Max Value are standard settings for numeric data collection activities. In addition, when you enable validation for these activities, you can also define upper and lower control limit values.
An Upper Control Limit value identifies a range of values (the Upper Guard Band) where the higher value is the existing maximum value and the lower value is greater than the minimum value.
The upper control limit value you specify is less than the Max Value and greater than the Min Value (or the lower control limit value when defined).A Lower Control Limit value identifies a range of values (the Lower Guard Band) where the lower value is the existing minimum value and the higher value is less than the maximum value.
The lower control limit value you specify is greater than the Min Value and less than the Max Value (or the upper control limit value when defined).
Assign a status comment for control limits
When you define one or both control limits for numeric collection activities, you can also use the Status Comment field (as a warning, for example) to assign/record a status comment if the data collection value recorded falls within the range you specify.
In Production, when a numeric data collection activity is executed and the collected value (one or both in the case of the Numeric Data Range Activity) falls within the defined range (guard band), the Status Comment is recorded as indicated in the activity definition.
In Production, when a numeric data collection activity is executed and the collected value (one or both in the case of the Numeric Data Range Activity) doesn't fall within the defined range (guard band) or no control limit was defined, the Status Comment is not recorded.
When a Numeric Data Collection Activity or Numeric Data Range Collection Activity is executed and the collected data value is recorded, if a validation range is defined for the activity the Min Value, Max Value, Lower Limit and Upper Limit values are recorded against the measurement.
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To support control limits and the guard band concept, the NumericMeasurement and NumericRangeMeasurement classes in the xTend API include the following properties:
public
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double
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LowerControlLimit
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{
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get;
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set;
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}
public
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double
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UpperControlLimit
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{
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get;
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set;
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}
A measurement that falls within a guard band is a passed measurement. To quickly identify measurements that have a measured value that falls within a guard band, a new string field called StatusComment was added.
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Upper and lower control limits are available to view in the Trace window in Production (Test Data and Parametric tabs) and in the Test and Measurement data source results (Quality and Test category) in DataMiner. (Use the Column Chooser to add or remove these columns as you would any other columns.)
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