Options - Alarm Tab

Control Charts for Variables vs. Charts for Attributes

Select the Alarm tab of the Options dialog box to access the options described here.

Log violations in .INI file. Select this check box to store the violations (as defined by the supervisor) in an *.ini file.

Remember the last k violations in the Log file. When you choose to store violations in a *.ini (or log) file, you can then specify how many violations to maintain in that file. If k = 25, then only the last 25 violations will be stored in the *.ini file.

Define out-of-control event (causing notification/alarm). Use the options in this box to specify which types of samples will generate an alarm in the chart. For each event you select, you can specify a variety of automatic actions to take including automatically requesting input of cause/action or launching another application. Note that Obs. Outside specification limits (see below) is only an option for variable control charts.

Check alarms hierarchically in sequence. Select this check box if you want STATISTICA to perform the check for alarms (violations) hierarchically. For example, you may want to first check whether or not a sample point is outside of the control limits, and if it is, you don't want to further check whether it also is outside of the warning limits (which would be true as well). This will avoid an unnecessary sequence of "actions" as specified on this tab. The exact sequence in which samples are checked for an out-of-control condition can be chosen via the Check Order boxes.

Sample out of control.  When this check box is selected, any sample that is out-of-control will be defined as an out-of-control event. In the Quality Control module, you can define out-of-control samples in many ways. You can specify samples that are more than 3 sigma away from the process mean. You can also use probability limits or user-specified limits to determine when a sample is out-of-control (control limits for more details).

Sample outside warning limits. When this check box is selected, any sample that is outside the warning limits will be marked as an out-of-control event. The warning limits can be adjusted by the user on the Specs tab of the Results dialog box; if the Sample outside warning limits check box is selected, and no user-defined warning limits are specified, the default warning limits will be used to define this alarm.

Runs violations. When this option is selected, any sample that violates one or more of the AT&T runs rules will be defined as an out-of control event. You can specify the AT&T runs rules to use on the Specs tab of the respective results dialog box.

Obs. Outside specification limits. When this check box is selected, you can define an automatic action to take whenever an observation (e.g., sample mean) is outside the specification limits defined in the Specs tab of the results dialog box. Note that this option is only available when the Options dialog box is accessed from a variable control chart results dialog box.

SVB Alarm Handler.

Use SVB Handler. Select this check box to specify a STATISTICA Visual Basic program that contains subroutines (user-defined event handlers) for processing the alarms. Note that the architecture of STATISTICA Quality Control is such that the chart "object" itself will send out automatically notifications regarding out-of-control events. The SVB program specified here should contain the SVB code necessary to handle those events. For example, you can write a program for the out-of-control event (SampleOutsideWarningLimits(Obj As Object, SampleID As String(), PartID As String(), NewSample As Boolean, flags As Long)) to fully customize how you want to respond. When you select this check box, the Choose source dialog box is displayed, where you can specify whether to select a file from your local file system or from Enterprise documents. If you use the Browse button to select the file (see below), then also select this check box to use the file.

Browse. Click this button to display the Choose source dialog box, where you can specify whether to select a file from your local file system or from Enterprise documents.

Create. Click this button to create an SVB program that contains subroutines for processing the alarms.

Edit. After selecting an SVB alarm handling file, you can click this button to edit the SVB file.

On OK, check for violations. When you click the OK button on this tab, the indicated samples will be checked for out-of-control events as defined in the Define Out-of-Control Events box.

Select All samples to check the entire chart for out-of-control events. For continuous monitoring of an ongoing process, select New samples only, or select All samples without a cause assigned to them.