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APPENDIX B: Setting Limits
Limits should be set at levels that allow you to react to the visual warning before
engine damage occurs.
• Enter Set Limits: To enter Set Limits press . The display should now be
flashing.
• Change Number:To change the number being displayed press the or the
button. Hold either of these buttons down and the number will change
faster.
• Next Limit: When you are finished setting the first limit, press the Function
button to set the next limit. Repeat the above procedure to set the remaining
limits, Tach calibration number and minimum lap time.
• Save Limits: To save the current limits and return to Monitor/Record mode,
press the Exit/Power button.
Note:
Set limits at levels high enough for normal operation, but not so high that
engine damage can occur before you can respond to a problem.
Limits can only be set for the functions your gauge is designed to monitor. If your
gauge monitors all three possible functions, the limits are set in the following
order: CHT/WT, EGT, Tach and Tach calibration number and minimum lap time.
If you do not have all of these functions, it will also set limits in this order, minus
the function(s) you are missing.
Tach
Tach requires two separate parameters. The first is the maximum revolutions per
minute (RPM) for safe engine operation. The second number is for Tach calibration.
In order to display the correct RPM for different engine types, the instrument
divides the Tach input signal by the Tach calibration number. This number can
be between .5 and 31.
The most frequently used Tach calibration numbers are:
1 - for single cylinder 2 cycle and most 4 cycle motors
2 - for 2 cylinder 2 cycle and 4 cylinder 4 cycle motors
If you are unsure of the exact Tach calibration number for your engine, experiment.
If your calibration number is currently set at 1 and the RPM displayed is double
what it should be, set the calibration number to 2. Alternately, if the RPM displayed
is half of the correct value, decrease the calibration number to half the current
number.
The Tach displays RPM in thousands of RPM. For example, if your display shows
9.50, your RPM is 9500.
