Sigma Difference Limit Alarm 
Alarm rule 11 is triggered when adjacent points in a series of points are vertically at least 4-sigma apart.
For alarm rule 11, the limit and length values are used for both the upper and lower charts. The data points on the chart are checked for the specified number of occurrences of two adjacent points being at least 4-sigma apart.
Features
Following are the Sigma Difference Limit Alarm properties:
Property Name | Parameter Name | Data Type | Description |
|---|---|---|---|
Allow Upper Sigma Difference Limit Alarm | AllowUpperSigmaDifferenceLimitAlarm | Boolean | Enables sigma difference alarm for upper charts |
Allow Lower Sigma Difference Limit Alarm | AllowLowerSigmaDifferenceLimitAlarm | Boolean | Enables sigma difference alarm for lower charts |
Limit of Sigma Difference Limit Alarm | WESigmaDifferentLimitAlarmLimit | Integer | Sets the limit and length to check for points that are 4-sigma or more apart. |
Length of Sigma Difference Limit Alarm | WESigmaDifferentAlarmLength | Integer |
Example
If you define alarm rule 11 with limit and length as 4 and 5 respectively, the rule is violated if only 4 points in a string of 5 adjacent data points are vertically at least 4 sigma apart.
Graphical representation of Sigma Difference Limit Alarm:
