Sch 1H para 9
In case of a reduction of the voltage supply to a value below the lower operating limit as specified by the manufacturer, the taximeter shall: — continue to work correctly or resume its correct functioning without loss of data available before the voltage drop if the voltage drop is temporary, i.e. due to restarting the engine; — abort an existing measurement and return to the position ‘For Hire’ if the voltage drop is for a longer period.