| Dependent variable and norm valueThe variable and the
value that determine when maintenance activity must be carried out. The dependent
variable is a unit of measurement. Example A copying machine must
be serviced after every 15,000 copies. The dependent variable is the number of copies. The dependent norm value is 15,000. - In case of predicted
inspections (PI), the value of the dependent variable must be measured and
compared with the norm values. If the measured value is outside the limits of
the norm values (upper/lower limit), an activity must be carried out. You can
do this immediately or as a follow-up activity.
Example The norm value was not
reached at the moment of maintenance. The next time the activity for this
machine will be carried out, is one month later. The prediction is changed. - In case of counter value (CV) and predicted activity (PA):
Maintenance must be carried out when the norm value is reached. As a result,
this value determines whether the activity must be carried out. Note: If a car
must be inspected every 2,000 km, the first norm value is 2,000 km, the second
norm value is 4,000 km, and so on.
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