307UM0100_01 May 2016
PD17x User Manual
Page 24 of 31
8.2
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 on that channel will operate.
Output relays set to PULSE will operate momentarily.
To check the sensitivity, presence time etc., use should be made of 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 (obtainable using the DU100 / DU700) will allow comprehensive
analysis of the operating characteristics of the detector.
