A-5
Menu — yellow button on the RAC which is used to access many of its
operation functions. Page 4-3.
Modular Distance Sensor (MDS) – a device which, when installed, condi-
tions pulses from a vehicle’s speed sensor to the RAC. Page 2-3.
nonvolatile memory — the permanent memory of the RAC, it is where the
data and calibration number are stored. It will remain here for fifty years
or more unless changed. Page A-2.
pulses — signals generated by a vehicle which, when conditioned through
a sensor, are read by the RAC to calculate distance traveled. Page 1-3.
pulse rate — the frequency at which pulses are sent to the RAC. They can
vary from 4,000 to more than 100,000 per mile. Page 1-3.
P-Dis (Pre-Distance) — menu function of the RAC, it allows you to enter
a known distance into the RAC. Page 4-5.
RAC — Road Analysis Computer. Brand name for JAMAR’s distance
measuring instruments.
SP (Speed) — black button on the RAC, it allows you to show your speed.
Page 4-3.
Sub — black button used to count down or subtract value from screen on
the DMI. Page 4-4.
Unit — gray button on the RAC, it selects the desired unit of measurement,
from miles to feet to meters. Page 4-3.
Appendix
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