Jamar RAC-100, Manual

Page: 19 / 56

Step 5 Drive the calibration course. The count you see represents the
pulses seen from your transmission sensor and not the distance
being traveled, so don't panic when the display doesn't equal the
actual length of your course.
Step 6 When you reach the end of the course, stop your vehicle so that
you are exactly aligned with the end marker using the reference
point on the vehicle used at the beginning of the course Press the
C-HOLD key and C.H along with the pulses counted will be on
the display. Press the CAL key and CF along with the computed
calibration number will be displayed. Record this number for
future reference. Press the ENTER key. Your calibration num-
ber is now stored in the DMI's nonvolatile (permanent) memory
and [C.H 0] is displayed. The
calibration number will stay in
memory for more than 40 years until
you re-calibrate or manually change
the calibration number. You are able
to view the current number every
time you power on the DMI.
You should rerun the calibration course to verify the calibration for your
vehicle. Press C-HOLD prior to measuring. If this is the first time you have
calibrated a DMI, you may want to run the course a couple of times to prac-
tice being properly aligned when starting and stopping at the course mark-
ers.
The calibration number used should be between .500 and 1.200. If your
calibration number is below this range, you need to use a higher division
factor (such as 1 to 16 or 1 to 32) by adjusting the
rotary switch on your MDS. Of course, if the cali-
bration number is too high, use a lower division
factor (such as 1 to 1 or 1 to 2). Refer to the Ad-
justing the Vehicle Speed Sensor Pulse Rate sec-
tion in Chapter 2 for more information on this.
Several calibration runs may be necessary to de-
termine which division factor is best for your ve-
hicle.
Your calibration
number should be be-
tween .500 and 1.200.
If not, you need to ad-
just the rotary switch
on your MDS.
3-3
Chapter 3 — Calibration
If you RAC does not
count during the cali-
bration procedure,
refer to the trouble-
shooting section on
the next page.