Decatur Electronics G3, Руководство пользователя и инструкция по установке, Страница: 35 / 76

G
3
™
U
se
r’s
&
In
sta
lla
tio
n M
an
ua
l
7/October/2020
35
3.9 Stopwatch Operation Mode
Calculate target speeds without transmitting radar signals by using
the stopwatch mode . The stopwatch mode relies on the time/
distance formula to calculate target speeds by measuring the
amount of time a motor vehicle takes to travel a known distance .
Speed = Distance / Time
To place the radar into stopwatch mode, first ensure that no antenna
is currently selected, then press and hold the OPTN button for two
seconds . The center “locked” window should display “STW” to indicate
you have activated the stopwatch function .
Figure 3.9
The Locked window will display "STW" whenever the G3™ is operating in the
Stopwatch Mode
The three numeric windows display time, distance, and speed .
TARGET WINDOW Calculated Speed in km/h
LOCKED WINDOW Distance in Meters
PATROL WINDOW Time in Tenths of Seconds
Example:
Distance Set to:
402 Meters
Time Measured: 150 (15 .0 Seconds)
Calculated Speed: 96 km/h
To make use of the stopwatch mode, you need a road surface
that is marked with known distance intervals, or you will need to
independently make a measurement between two visible points
on the road in which you can time motor vehicles passing between
those points (for example a bridge underpass and a road sign) with
some precise distance measuring equipment .