AiM MyChron3 Basic - Manual (Page 27)

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Then push MEM to enter EDIT MODE: use MENU/<< to change
numbers and >> to change digit. The blinking digit identifies the
digit that can be edited.
When the required temperature has been set, press MEM to
save changes or press VIEW to discard changes.
The temperature alarm can be set between 0 and 1999
degrees.
When the system displays a temperature greater than the alarm
value, the temperature on the display will begin flashing. When
the thermocouple temperature falls below the alarm value, it will
cease flashing.
Max RPM
value
This function sets the maximum scale for the graphical RPM
display and the maximum acceptable RPM value captured by
MyChron 3.
MyChron 3 has five levels for the maximum RPM : 8,000 /
10,000 / 12,000 / 16,000 / 20,000 RPM / 22,000 / 25,000 RPM.
To run this function, after having entered the CONFIGURATION
MODE, push MENU/<< until you see
MAX RPM VALUE
Then push MEM to enter EDIT MODE and use MENU/<< or >>
to scroll between the five standard RPM values. When the
required RPM value is displayed, press MEM to save the
changes or VIEW to quit.