Statistic
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Mean value for the latest completed subgroup
Sigma for the latest completed subgroup
Mean of subgroup range (number of subgroups)
Mean of subgroup mean (number of subgroups)
In order to rapidly detect changes in the process, Power Focus is equipped with a number of statistical
alarm limits based on the
and R calculations for torque and angle.
Statistical Process Control (SPC) functions are used on torque and angle.
All calculations are performed on the Pset that the tool is currently running with.
If any of the following criteria are true, then the stat alarm is lit and a relay (if used) is activated. The tool
may still run even if an alarm is issued. The alarm is only a warning. The alarm signals remain active until
the process falls within all limits again or the result memory is cleared. This means that the alarm does not
switch off during tightening.
19.1 Statistic alarm
> UCL
< LCL
R > UCL
R < LCL
Cp < 2.0
Cpk < 1.33
SPC
and R compared with LCL / UCL alarms cannot function until the LCL and UCL have been
programmed.
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