Taxímetros

INTERNATIONAL RECOMMENDATION

OIML R 21
Edition 2007 (E)

Taximeters Metrological and technical requirements, test procedures and test report format

Taximètres Exigences métrologiques et techniques, procédures d’essais et format du rapport d’essais

OIML R 21 Edition 2007 (E)

ORGANISATION INTERNATIONALE DE MÉTROLOGIE LÉGALE INTERNATIONAL ORGANIZATION OF LEGAL METROLOGYOIML R 21: 2007 (E)

Contents
Foreword .................................................................................................................................................................5 1 SCOPE ...........................................................................................................................................................6 1.1 Application.............................................................................................................................................6 1.2 Principle of operation .............................................................................................................................6TERMINOLOGY..........................................................................................................................................6 2.1 General ...................................................................................................................................................6 2.2 Construction ...........................................................................................................................................7 2.3 Metrologicalcharacteristics....................................................................................................................9 2.4 Indications and errors ...........................................................................................................................12 2.5 Testconditions......................................................................................................................................13 METROLOGICAL REQUIREMENTS ...................................................................................................15 3.1 Main function of the taximeter .............................................................................................................15 3.2 Maximum permissible errors (MPE)....................................................................................................15 3.3 Taximeter accuracy conformance over time.........................................................................................16 3.4 Units of measurement...........................................................................................................................16 3.5 Variations due to influence quantities..................................................................................................16 3.6 Taximeter constant, k............................................................................................................................16 3.7 Real-timeclock.....................................................................................................................................17 TECHNICAL REQUIREMENTS .............................................................................................................17 4.1 Suitability for use .................................................................................................................................17 4.2 Security of operation............................................................................................................................17 4.3 Fare calculation ....................................................................................................................................18 4.4 Tariff programming ..............................................................................................................................19 4.5 Operating position...