Stalker DSR 2X - LEGAL PRECEDENT: ADMISSIBILITY OF RADAR EVIDENCE; KEY LEGAL CASES ON RADAR ADMISSIBILITY

TUNING FORK TESTING
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Fork Testin
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Modes 2X Dis
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Unit
Stationary Mode Tuning Fork Test
The following tuning fork test can only be performed during the 5-
minute interval that follows the Internal Circuit Test. Press and hold
the TEST key and wait for the 2X to cycle through its internal test
sequence. The presence of two decimal points at the bottom of the
two target windows indicates that the 2X is in tuning fork mode (Fig.
52).
Two (2) tuning forks are supplied with S
DSR 2X. The
tuning forks are calibrated for 25 mph and 40 mph (40 and 64 kph).
To perform the tuning fork test: press the PWR key, press the
MOV/STA key and select stationary mode, press the desired Target
Zone key to enter transmit mode. Press the TEST key and wait for
the tuning fork mode following the internal test sequence. Strike the
25 mph tuning fork against a hard nonmetallic surface, such as the
heel of a shoe. Quickly hold the tuning fork approximately two (2)
inches in front of the antenna, with the narrow edge of the fork
facing the antenna. The target window should indicate 25 ± 1 mph
(40 kph) (Fig. 53).
Repeat the above test with the 40 mph (64 kph) tuning fork.
To exit tuning fork mode before the 5-minute interval is over, press
the MENU key and then any of the four Target Zone keys, or put
either antenna in HLd.
During VSS operation, the TEST key allows the MOV/STA key
(normally disabled during VSS operation) to be used to switch
between various stationary and moving modes as required for the
tuning fork tests. If a vehicle with VSS starts moving, tuning fork
mode is automatically exited.
Note: We recommend the tuning fork test be performed on the front
antenna. Some departments may require this test on both antennas.
Check your department policy.
Fig. 52
Fig. 53
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