RAC Plus User’s Manual
3-4
Step 7
Press Enter and the unit of measurement will return to your desired unit of
feet, mile or meter. Press Enter again to exit the menu function and return to
normal operation. Your calibration number for the vehicle selected is now
stored in the RAC's nonvolatile (permanent) memory. The calibration num-
ber will stay in memory for more than 50 years, or until you re-calibrate or
manually change the data. You are able to view the calibration number and
unit (vehicle) number every time you power up the RAC.
You should rerun the calibration course, in the normal mode, to verify the
calibration for your vehicle. Press the CH key prior to measuring. If this is
the rst time you have calibrated a DMI, you may want to run the course a
couple of times to practice being properly aligned when starting and stop-
ping at the course markers.
Important: Ideally, the calibration number used
should be between .500 and 1.200. If your cali-
bration number is below this range, you need to use
a higher division factor such as 16 on the Modular
Distance Sensor (MDS). Of course, if your calibra-
tion number is too high, you can lower the number
by using a lower number such as 1 on your MDS.
This is done by adjusting the rotary switch on the
MDS so the slot points to 1, 2, 8, 16, 32 or 64.
Any time you adjust the rotary switch setting, you must re-calibrate to
get the correct calibration number. Changing the switch setting will not
change the calibration number, only the number of pulses being received
by the RAC.
Refer to the Adjusting the Vehicle Speed Sensor Pulse Rate section in Chap-
ter 2 for more information on this. Several calibration runs may be necessary
to determine which division factor is best for your vehicle.
Your calibration
number should be
between .500 and
1.200. If not, you
need to adjust the
rotary switch on
your MDS.
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