304UM0001 Rev 00
PD160 Enhanced Series User Manual
Page: 32 of 39
8.2 Detector On Board Diagnostics
For more information on the on-board diagnostics refer to section 3.2.6.
8.3 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.
Output relays set to PRESENCE will operate.
Output relays set to PULSE 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 on-board diagnostics will allow comprehensive analysis of the operating
characteristics of the detector.
