Vehicle Ignition Interference; Testing The Device; Operator-Requested Self Test - Decatur Electronics GHD User Manual

GHD & SCOUT
TM TM
USER'S MANUAL

7.10 Vehicle Ignition Interference

The GHD and SCOUT have been designed to operate from the
vehicle's cigarette lighter receptacle (or from the 6 internal AA
Nickel-Metal-Hydride batteries located in the base of the handle in
the case of the SCOUT). When connected to the cigarette lighter
receptacle it should be noted that some vehicles exhibit excessive
alternator noise at the lighter receptacle. In these rare cases, the radar
can exhibit erratic readings, especially when the vehicle's electrical
system is operated under heavy load. Wiring an accessory outlet
directly to the battery minimizes the effect. If you are operating off
of the gun's internal batteries then vehicle ignition interference will
not be a factor.
If you suspect your vehicle's electrical system, contact Decatur
Electronics' Customer Service Department for more information.

8. Testing the Device

8.1 Operator-Requested Self Test

Pressing the TEST button initiates a comprehensive system self
test, which checks the numeric displays and runs a target speed
simulation. The self test checks:
Display Test–The display test verifies that the digit segments and
status icons are working correctly and that none of the pixels in the
number segments are damaged.
Circuitry Test–The system checks the internal circuitry. If the unit
passes all internal checks, the message PASS will be displayed. If
an error should occur then FAIL will appear in the display window.
Speed Simulation Test–The radar verifies speed accuracy using
synthesized Doppler frequencies corresponding to a series of four
simulated speeds: 15, 30, 45, and 60 (when in mph mode) and 25,
50, 75, and 100 (when in km/h mode).
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