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any output intended for testing the accuracy of the meter does not produce pulses or signals corresponding to an energy of more than the critical change value,
and in reasonable time after the disturbance the meter shall:
recover to operate within the MPE limits, and
have all measurement functions safeguarded, and
allow recovery of all measurement data present prior to the disturbance, and
not indicate a change in the registered energy of more than the critical change value.
The critical change value in kWh is
(m being the number of measuring elements of the meter, Un in Volts and Imax in Amps).