RAC Plus User’s Manual
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Glossary
Refer to the page number listed after each entry for more information.
Add — black button used to count up or add value to the screen on the
RAC. Page 4-3.
Dim — blue button on the RAC, it is used to change the brightness of the
display. Page 4-4.
calibration course — known distance used when calibrating the RAC. One
thousand feet is ideal, but it should not be less than 500 feet. Page 3-2.
calibration number — a number, unique to each vehicle, that represents
the pulses from the transmission received over a set distance. This number
should be as near to 0.500 - 1.200 as possible, and is necessary for the RAC
to count. Page 3-4.
CLR (Clear) — red button on the RAC that resets the distance or time to
zero. Page 4-4.
CH (Count Hold) — red button on the RAC which stops the computation
of distance pulses. Page 4-2.
DH (Display Hold) — red button on the RAC which stops the display, but
allows the RAC to continue accumulating distance internally. Page 4-2.
DMI — generic industry term meaning Distance Measuring Instrument.
The RAC Plus I and Plus II are DMIs.
DPO (Distance Pulse Output) — menu function on the RAC, when acti-
vated it will provide a +5VDC (TTL level) output pulse at a pre-selected
distance interval and signal duration. Page 4-7 to 4-9.
EEPROM — stands for Electronically Erasable Programmable Read Only
Memory. It contains the permanent memory of the RAC. Page A-4.
ENT (Enter) — green button on the RAC, it accepts any number keyed
into the display. Page 4-4.
Erase — menu function of the RAC, it is used to clear all memory locations
in the RAC. Page 4-14.
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