20
II
N
N F
F R
R A
A R
R E
E D
D
E
E
X
X T
T E
E N
N D
D E
E R
R
-- M
M
A
A II N
N
S
S
Y
Y S
S T
T E
E M
M
U
U
N
N II T
T
•
36
Test for Optical Interference
Reconnect the problematic sensor/keypad to
the IRP2+. Cover up the Sensor with a piece of
cardboard (your hand will actually create elec-
tromagnetic interference under some condi-
tions). Observe the IR test LED.
• IR Test LED On or Flickering:
Go to 37
• IR Test LED Off:
Go to 36
•
37
Optical Interference
Identify the source of the interference. The
most common sources of optical interference
are listed in the order of their probability:
A) Sunlight. Reflections from windows, mirrors,
swimming pools, shiny floors or objects.
B) Fluorescent light fixtures.
C) Neon signs.
D) A malfunctioning IR Remote Control.
E) A malfunctioning Infrared Motion Detector
on your Security system.
Either re-orient the sensor or move the source
of interference. Niles infrared sensors have
built-in filters to attenuate the effect of visible
light. If you add additional filtration you will
reduce the effectiveness of the system with
remote controls as well as the interference.
If you are using the MS-1 or the MS-2 minia-
ture sensors consider exchanging them for
IRR-4D, TIR-1 or the CMS-3 ceiling sensor.
These three sensors have AGC circuits which
serve as automatic filters.
If you choose to attempt to filter an MS-1 or
MS-2, try a temporary material (e.g. a single
thickness of facial tissue) and test whether fil-
tration will solve the interference and still give
acceptable range.
•
38
Electromagnetic Interference (EMI)
Identify the source of the interference. The
most common sources of electromagnetic
interference are listed in the order of their
probability:
A) Televisions (particularly large direct view
sets).
B) Wall-mounted light dimmers or variable
speed controls for ceiling fans. These controls
emit more interference when turned down
halfway. They emit little or no interference
when turned up all the way (brightest posi-
tion).
C) Fluorescent lights (the electronic ballast
sometimes emits EMI)
D) Large appliances (air-conditioners, pumps,
motors, compressors etc.)
E) AC line noise (noise brought into the system
