Sch 1F para 3 Maximum permissible effect of disturbances
The effect of an electromagnetic disturbance on a measuring system shall be one of the following: — the change in the measurement result is not greater than the critical change value as defined in paragraph 3.2, or — the indication of the measurement result shows a momentary variation that cannot be interpreted, memorised or transmitted as a measuring result. Furthermore, in the case of an interruptible system, this can also mean the impossibility to perform any measurement, or — the change in the measurement result is greater than the critical change value, in which case the measuring system shall permit the retrieval of the measuring result just before the critical change value occurred and cut off the flow.