| # Dependent variable and norm value The 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. |