
TDC Ultra User’s Manual
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office. When in the field, a cigarette lighter adapter, which comes standard
with new units, can be used. This item draws power from the vehicle’s bat-
tery and is required for TDC Ultras equipped with backlit displays.
Note : To prevent possible damage to the Ultra from a power surge, do not
turn the vehicle on while the cigarette lighter adapter is plugged into the
Ultra.
Note: When using either the cigarette lighter adapter or external power
supply, the On/Off switch of the TDC Ultra does not need to be turned
on. We recommend that the switch be left in the OFF position as this will
prevent the TDC Ultra from drawing power from the internal AA batteries,
and extend their life.
Programming the TDC Ultra
The TDC Ultra is simple to use. An OFF/ON switch on top of the unit
panel is used to turn the unit on and off. A 4-line by 20-character display
helps you select the proper entries. All options are clearly displayed, with
the currently selected option shown with a blinking highlight. The bottom
lines of the display are used to ex plain the option that is high lighted.
Two buttons are all that are used to move from menu to menu, and to select
from the various options shown on the display. The TAB key is used to
cycle through the options while the DO key is used to select an option. If
you move the highlight too far and over-shoot the desired option, just keep
pressing the TAB key until it is re-selected.
Collecting Data
The TDC Ultra is designed to make data collection simple and accurate.
The 16 gray buttons are arranged to simulate a standard intersection, which
makes doing Turning Movement studies intuitive. Of the 16 buttons, 12 are
normally used for the left, through, and right movements from each of the
four approach directions. The additional four buttons are user-defined; they
can be used for buses, trucks, bicycles, pedestrians, or whatever you want.
If a car makes a left turn from an approach, you simply push the button
that shows a left turn from that direction. The TDC Ultra keeps track of
everything else for you.
The 14 yellow buttons at the bottom of the board are used to classify vehicles
while doing an Enhanced Turning Movement study.
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