AiM MyChron3 Basic - Manual (Page 30)

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The standard racing option allows the user to set all the
parameters described in the previous paragraphs, while the
oval racing option sets some of these parameters (RPM factor,
Obscuring time, Split number, Display language) to a fixed
value.
If you wish to switch from “Standard racing” to “Oval racing”,
please turn off your gauge and, then, turn it on pressing buttons
>> and MEM/OK. The gauge will automatically switch from
“Standard racing” to “Oval racing”.
The procedure to step back from “Oval racing” to “Standard
racing” is similar to the one previously described: turn off the
gauge and, then, turn it on pressing buttons >> and MEM/OK.
The first time you turn on the gauge after having switched
among the 2 available track types, the display will show one of
the following texts:
Standard racing
Oval racing
The oval track option will set the parameters as follows:
ƒ Split times = 0 (i.e. no split times available)
ƒ Obscuring time = 4 sec
ƒ RPM factor = X1
ƒ RPM scales = 8,000 / 12,000 / 20,000
ƒ Temperature unit of measure: Fahrenheit [°F] degrees
ƒ Display language = English