acceptance checks and machining must be carried out at the reference temperature, but points out that, in the case of dimensional measurements, a temperature other than the reference temperature may lead to the need to apply an offset or correction to the measurement result, thus contributing to greater uncertainty in the overall measurement.
Consequently, acceptable limits of temperature variation, in other words temporal and spatial gradients according to one’s own measurement needs, should be established in order to determine how far the temperature can deviate from 20°C during measurement or test activities without being excessively penalising in terms of measurement uncertainty.

For these reasons, it is absolutely necessary that the air conditioning system, while allowing temperature variations within the set limits, is able to control temperature and possibly humidity with a fine triple-stage control in order to have an average temperature value as close as possible to the desired value.

Example: