Mini-Test; Tuning Fork Test - Decatur Electronics GHD User Manual

GHD & SCOUT
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8.2 Mini-Test

The tSt option sets the system to automatically perform a "mini" self
test every 10 minutes, which is required in some states.

8.3 Tuning Fork Test

In addition to the system test, you can verify signal processing
accuracy by using a tuning fork, which comes with the radar.
To begin the test, tap the tines of the fork on a firm, non-metallic
surface. The tuning fork will ring audibly. Then place the tuning fork
that you tapped with the narrow side facing about 3 inches directly
in front of the antenna. Pull the trigger and compare the speed in the
display window to the speed stamped on the fork. If the difference is
within ±1 display unit, the radar gun is working properly.
Only tap the tuning fork against hard plastic, wood, and
materials that are softer than metal. Repeatedly tapping the
tines on hard surfaces, such as metal and concrete, can
damage the tines and invalidate the fork for future tests.
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Place the vibrating tuning fork about 3
inches in front of the antenna.
If the device does not display the expected speed, contact
Decatur Electronics Customer Service at +358 207 528 508
to arrange for service.
Figure 8.3
USER'S MANUAL