NOTE

When to run this test

If you have a feeling the meter is not charging the distance you are actually covering — fares coming in light on a run you know well, or the distance reading looking short at the end of a job — this is the first thing to check. The sensor test tells you in under a minute whether the speed signal from the car is reaching the meter at all. It is worth running before you ring anyone, and worth running the week before your Legal Metrology appointment with Applus.

Button layout

The meter has four buttons. On the RS-01 they run 1, 2, 3, 4 from left to right, Button 1 on the far left and Button 4 on the far right. On the S-01 they run top to bottom, Button 1 at the top and Button 4 at the bottom. On both models, Buttons 1 and 2 move back and forth through the menu, Button 3 is enter, and Button 4 is back.

Where the test lives

"TESTS" is a menu in its own right — it sits alongside "SETTINGS" on the main menu, not inside it. From "FOR HIRE" press Button 3, then step along with Button 1 or Button 2 until "TESTS" appears.

What this test actually does

The sensor test counts the electrical pulses arriving from the vehicle's speed signal. It does not show speed and it does not show a fare — it is a raw pulse count, and the only thing that matters is whether the number climbs when the car moves.

Do it safely

The number has to be read while the car is rolling. Do it in a yard, an empty car park or with a second person driving. Never sit reading the meter while driving in traffic.