Applied Concepts Inc ACMI006 Manuale Utente
Moving-Vehicle Test
A moving-vehicle test can be performed as an additional check of performance and accuracy. While driving a patrol
vehicle, with an accurately calibrated speedometer, aim the antenna down an empty highway directly in front of the
vehicle. The speed indicated by S
vehicle, with an accurately calibrated speedometer, aim the antenna down an empty highway directly in front of the
vehicle. The speed indicated by S
PATROL
should match the speedometer indication to within a small error
(depending on speedometer accuracy). This test is optional and is not a substitute for the tuning fork test, but is a good
overall indication of proper operation of the unit.
overall indication of proper operation of the unit.
VEHICLE SPEED SENSOR (VSS) OPERATION
Traffic Radar Patrol Speed Measurement
Moving traffic radar systems normally obtain patrol speed by measuring the speed of the radar return from the moving
roadway in front of the vehicle. Patrol speed tracking sometimes suffers from anomalies known as “batching” and
“shadowing”. These anomalies occur during moments when the roadway is obstructed from the radar beam by road
conditions or other vehicles. The solution is to allow the traffic radar to monitor vehicle tire rotation and to use this
information to perform “patrol speed steering.” The simplest way to monitor tire rotation is to attach to the Vehicle Speed
Sensor (VSS) signal in the patrol vehicle.
roadway in front of the vehicle. Patrol speed tracking sometimes suffers from anomalies known as “batching” and
“shadowing”. These anomalies occur during moments when the roadway is obstructed from the radar beam by road
conditions or other vehicles. The solution is to allow the traffic radar to monitor vehicle tire rotation and to use this
information to perform “patrol speed steering.” The simplest way to monitor tire rotation is to attach to the Vehicle Speed
Sensor (VSS) signal in the patrol vehicle.
The VSS Speedometer Signal
All modern vehicles have a VSS sensor (Vehicle Speed Sensor) attached to the transmission or an axle that generates a
speed signal. The speedometer and other electronics in the vehicle use the VSS speed signal. By tapping into this signal,
the Stalker PATROL can monitor the actual patrol car speed and use the VSS speed information to help the radar pick the
correct ground speed. The radar’s patrol car speed is still always measured by radar. The VSS simply helps steer the radar
into making the right choice.
speed signal. The speedometer and other electronics in the vehicle use the VSS speed signal. By tapping into this signal,
the Stalker PATROL can monitor the actual patrol car speed and use the VSS speed information to help the radar pick the
correct ground speed. The radar’s patrol car speed is still always measured by radar. The VSS simply helps steer the radar
into making the right choice.
The Result is PERFECT Patrol Speed
• The radar will never shadow.
• It tracks and acquires patrol speeds from 1-200 mph.
• Moving / Stationary selection becomes automatic.
• It tracks and acquires patrol speeds from 1-200 mph.
• Moving / Stationary selection becomes automatic.
VSS Cable Installation
To take advantage of VSS patrol speed steering,
requires two cables that are provided with the VSS
Option.
requires two cables that are provided with the VSS
Option.
The vehicle VSS cable (PN 155-2179-00), should be
permanently installed by an automobile service shop
using the included installation instructions.
permanently installed by an automobile service shop
using the included installation instructions.
On the right is how the vehicle VSS cable is normally
attached (with 3 screws) to the bottom of the dash
with a metal L-bracket for convenience.
attached (with 3 screws) to the bottom of the dash
with a metal L-bracket for convenience.
The radar VSS cable (PN 155-2178-00) replaces the
conventional cigarette power cable and can be
removed from the vehicle with the radar.
conventional cigarette power cable and can be
removed from the vehicle with the radar.
IMPORTANT NOTE: Observe the black polarity marks on the two white 6-pin VSS connectors that plug together. The
two white 6-pin VSS connectors can be plugged together with the marks in alignment or the marks opposed. Because of
vehicle VSS signal level variations, one of these plug-in positions may not provide a working VSS signal to the radar. If
you observe the symptom of the speedometer not functioning or the symptom of the radar not “seeing” the VSS signal,
rotate the marks 180
two white 6-pin VSS connectors can be plugged together with the marks in alignment or the marks opposed. Because of
vehicle VSS signal level variations, one of these plug-in positions may not provide a working VSS signal to the radar. If
you observe the symptom of the speedometer not functioning or the symptom of the radar not “seeing” the VSS signal,
rotate the marks 180
° and try again.
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