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The Six Sigma monitoring procedure of a ToolScope is largely a variation of the Statistical monitoring procedure. The limits in this procedure are calculated using the Six Sigma method.

 

Configuring the Six Sigma monitoring procedure

 

1.7.1     Configurable parameters

Function name

Description

Activate offset compensation

 

The "Activate offset compensation" point can only be selected if the checkbox next to "Compensate signal offset" is set under
"Service / Settings / Monitoring / Channel 1". If this function is activated, the respective signal is set to zero when measuring starts. This is helpful when there is a fluctuating base load, as false alarms are avoided.

Deactivate tolerance ranges

If this function is activated, the green tolerance ranges are hidden. This is useful if you have redefined your monitoring under Maximum value / Wear limit / Missing limit.

Distance to lower limit (in Sigma)

This value specifies the distance between the lower limit of the tolerance range in the Y direction and the signal. The value always relates to the distance that the monitoring would set by itself. A value of "1" causes the automatically calculated value to be applied exactly. Larger values increase the distance. Smaller values reduce it.

Distance to upper limit (in Sigma)

This value specifies the distance between the upper limit of the tolerance range in the Y direction and the signal. The value always relates to the distance that the monitoring would set by itself. A value of "1" causes the automatically calculated value to be applied exactly. Larger values increase the distance. Smaller values reduce it.

Delay time after the start of the process [s] / Delay time before the end of the process [s]

These values specify the time range after the start or before the end of the process during which the monitoring should not calculate any limits. If both values in this field are set to "0.0", both parameters are ignored.

Safety distance from the signal in the X direction [s]

This value specifies the distance between the limits and the signal in the X direction.

Relearn; number of processes

As soon as the checkmark is set next to "Relearn; number of processes" and the process is observed the next time, the monitoring forgets the previous data and relearns the newly entered number of processes.

Note: The figure shows a process continuing normally, even though the tolerance range was clearly breached. You can only obtain this type of image if you deactivate alarms under "Service".