There is something wrong with your description, because lots of places have entries and exits that don't result in complete laps, and as a user of a Mychron 3 I have never had to 'complete' the lap.
The system requires the rev counter to start, otherwise all you get is a single time covering all of the session and the system registers the end of session when the engine stops.
You do need to wait for a little while to allow the system to stop, the delay is there so that a short off on the track does not create another Test period. Wizzing the buttons the moment the kart stops in park ferme is going to upset it. You can tell the machine is ready to be read because you get a single, stationary time of the last lap. Pressing OK then will highlight the best lap and OK again will take you to the best lap. Then up arrow/ down arrow to look at the various times.
Note also that you can use the Mychron to time 'whole laps'. Set the splits to 0 and the obscuring time long enough to get past the intermediate magnet lines.
If you are really subtle, you can dawdle round the track with 0 splits set, so that the timer recognises the first magnets you come to as the start of lap, but recognises the start line as the beginning of the next lap (the first magnet after obscuring time finished). Speeding up to race speed then keeps each lap recognising only the start/finish line.
Lastly, if you really must have "proper" lap start, find out how many strips there are before the physical start (lets assume there are three strips and the 'start' line is the third one from the dummy grid). Start the motor (to get the rev count) and pass your hand held magnet on a stick under the strip sensor once. The logger will now read first strip it comes to as strip 2, the second as strip three and the actual start finish line at the start of the new lap. Thereafter it will recognise the laps in their 'proper' place. If you have to pre-run more than one strip, remember that you will have to wait out the 'obscuring time', ge at least 3 seconds between passes with the magnet.
Also, be aware that driving over the kerb / going airborne where the magnets are will often put the sensor out of range and the laps will get all confused because the system simply counts the number of strips, it doesn't know where they are or that one has been missed by being out of range.
If you son is regularly losing the lap count and the Mychron generally seems to be working otherwise, it may be his driving.
Lastly, don't run the rev counter alongside the temperature gauge wire nor the lap counter wire, It picks up large inducted signals from the HT cable and can pass them on to the other sensors (the sensor cables should be shielded but sometimes the shielding breaks down).
And you have mounted the lap sensor along the direction of travel? I have seen someone mount it pointing across the kart and wonder why it didn't work very well. They thought the kart and arrow moulded into the top surface was just decoration.
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Mychron 3 setup question by 'orangeart' (19 May 2014 @ 11:47)
