19
G
ENESIS
-VP™: User’s Manual
6.2
Tuning Fork Test
NOTE: Keep Trigger pressed during entire test.
In addition to the system test, the operator can verify the overall system
accuracy by using a tuning fork.
After tapping one of the tines of a tuning fork, the fork vibrates at the
frequency stamped on the handle. When the operator places the tuning fork
in front of the antenna, the system detects the fork and displays a speed.
Compare the speed displayed to the speed stamped on the fork. The
displayed speed must be within one (1) mph (or kph if testing a kph unit) of
the speed stamped on the fork.
Tapping the tines against surfaces like metal and concrete may damage the
tines and invalidate the fork for future tests. Tap the tines against hard
plastics or wood to avoid unnecessary damage. Using the fork at temperature
extremes may also affect the readings.
Figure 11:
Tuning Fork
