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301UM0030_01 PD130 Enhanced Vehicle Detector User Manual Page: 24 of 29
8.3.5 Crosstalk
For information about resolving crosstalk refer to the “Theory of Application” section in Diagnostic
Unit DU100 User Manual Document No. 895UM0001.
8.4 Functional Test
To test a detector, connect it to an inductive loop with a total inductance in order of 300 microhenries.
(This may be achieved in the workshop by winding (x) turns of wire on a non-metallic former of
diameter (y)).
X = 19 turns 0,25mm wire
Y = 238mm (9.4 inches)
Bring a small metal object approximately the size of a matchbox close to the loop coil. The following
will happen on detection:
The OUTPUT LED will light up.
The PRESENCE output relay will operate.
The PULSE relay will operate momentarily (approximately 150ms duration).
To check the sensitivity, presence time etc., use should be made a calibrated tester, which
compromises of a calibrated loop similar to the one described above with a moveable vane, which can
be moved over the loop at pre-determined heights.
This device together with the DU100 hand-held test instrument will allow comprehensive analysis of
the operating characteristics of the detector.
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