Power On & Start Up
Your RAC Plus DMI has been designed for simple opera-
tion, using large individual keys which provide a click
and tone feedback.
The two 6-digit high-intensity LED display windows al-
low flexibility in displaying data to you. The upper, larger
display window (referred to as D-1) is primarily used to
display distance. It is also used to indicate menu locations, time and GPS coordinates. The lower, smaller display window (referred
to as D-2) is used to display count status, speed, interval distance, menu descriptions, etc.
This is the slide switch which provides power to the RAC Plus. When turned on, the RAC will go into GPS Sensor
start-up mode.
OFF/ON
Installing the RAC Instrument
The compact case design of the RAC Plus allows mounting of it in a number of convenient lo-
cations. Popular locations include on the front of the dashboard, above or below the dashboard,
or on the windshield using the optional windshield mounting bracket. Wherever you decide to
mount the instrument, remember it should be within easy reach and the display should be visible
without obstructions.
It is most common to mount the RAC to the front of the dashboard using the Velcro provided.
Two plastic 'L' brackets are also provided to facilitate mounting to the top of the dashboard if that
is your preferred location. For best results, attach the 'L' bracket so that the bottom of the 'L' is facing away from the RAC as shown
in the figure here.
Using the two 'L' brackets allows you to compensate for curved dashboards even
if it requires the RAC to be mounted on a left or right slope.
Note:
While the RAC Plus I is designed to withstand very high temperatures, we
recommend disconnecting the RAC and storing it in the glove box or below the
dash if the vehicle will be left for long periods of time in direct sunlight and high
temperatures.
POWER >>>
Computer
Only >>>
Calibration
–
Your RAC Plus must be calibrated in order to accurately measure distance.
In order to accurately measure distance, your RAC Plus must know the exact distance that the vehicle will travel based on pulses from
the vehicle’s speed sensor. The calibration number is the automatic calculation that represents the number of pulses received over a
set distance. This number, once calculated, will remain accurate until a change to the vehicle occurs, such as different size tires are
put on the vehicle, tire wear, tire pressure change, etc. Such changes will require a re-calibration in order to maintain proper accuracy.
The RAC Plus has the ability to store four (4) separate vehicle calibration numbers in memory. This simplifies sharing one instrument
between up to four different vehicles.
In order to calculate the calibration number for your particular vehicle, you must first establish a
calibration course
. The length of
the course can be any known distance more than 500 feet. One thousand feet is ideal, but the course can be any distance over 500
feet (for example, 623 feet from pole to tree). Your course should be
straight
and
accurate
, so take the time to measure the course
using a 100’ tape or hand wheel. Mark the beginning and ending points so they can be seen from inside your vehicle. Remember,
the course length can be any
accurate
distance over 500 feet, so for convenience you could use a telephone pole or other marker as
reference point.
Note: If you are using the Metric unit of measuring, laying out the calibration course in feet is required to obtain the most
accurate calibration number.
