Ampetronic ILR3 User manual

Handbook contents:
•Safety
•Introduction
•Operation
•Troubleshooting
•Specification
•Warranty Information
•Declaration of Conformity
Box Contents:
1 x ILR3 or ILR3+
1 x Lightweight stereo headphones
1 x Handbook (this document)
1 x A5 user guide (ILR3+ only)
2 x AA batteries
ILR3 & ILR3+
Induction Loop Receiver

The Lightning bolt triangle is
used to alert the user to the
risk of electric shock.
This symbol is used to alert the
user to important operating or
maintenance instructions.
Safety:
1. It is important to read these instructions, and to follow them.
2. Keep this instruction manual in an accessible place.
3. No user serviceable parts. Refer all servicing to qualified personnel.
4. No objects filled with liquids, such as vases, shall be placed on the
apparatus.
WARNING: Do not expose to dripping or splashing.
5. Clean only with a dry cloth.
Introduction
The ILR3 and ILR3+ units are high quality induction loop receivers which allow the
user to listen to an Audio Frequency Induction Loop (AFILS) system using a pair
of standard stereo headphones.
The ILR3 can be used:
•To check an induction loop system is working. It is useful for venue
managers, test engineers and event organisers.
•To check the extent of induction loop coverage.
•To record the output of a loop system.
•The ILR3 can be used by people who need some additional assistance
but do not have a hearing aid.
•To check if a proposed installation has excessive (magnetic) background
noise prior to installing the loop system.
The ILR3+ has additional features to allow:
•Accurate indication of magnetic field strength with respect to IEC 60118-4
for periodic monitoring of system installations.
Operation – ILR3 & ILR3+
Remove battery cover located on the rear of the unit, and insert 2 x AA batteries as
shown by the polarity indication inside the unit.
The unit is switched ON / OFF by inserting / removing the headphone plug.
The green ‘Power’ LED will illuminate to indicate that the batteries are charged and
have been inserted correctly.
The volume of the headphones can be adjusted using the rotary control knob.
The ‘Low Cut Filter’ switch allows the low frequency (bass) response of the unit to
be changed. Whilst a full range response gives best quality reception, the cut mode

may help reduce the annoying “hum” experienced when there is magnetic
interference from AC power circuits, and simulates a real hearing aid.
Remove the batteries from the unit when not using the unit for long periods.
Operation – ILR3+ only
The two extra LEDs (marked HI and LO) on the top of the
unit provide a visual guide to the strength of the field
created by the loop system.
The rear panel of the ILR3+ provides a key which shows
that the LO (Amber) LED should normally be illuminated by
a typical system, while the HI (Green) LED should just be
illuminated and flicker, but not be on continuously.
A more detailed procedure is provided separately.
Important: Measurements taken using the ILR3+ are
dependant on the frequency response mode setting, i.e. flat
or Low cut, and should be set to Flat in most cases.
Troubleshooting ILR3 & ILR3+:
‘Power’ LED does not illuminate
•Check that the headphones are plugged into the unit.
•Check that the batteries are fitted correctly as shown inside the unit.
Reversing the battery polarity may damage the unit and invalidate the
warranty.
•Try using new batteries.
No signal is heard in the headphones
•Check the volume control is adjusted correctly.
•Ensure that the loop system is available and switched ON in the venue.
•Hold the unit vertically.
Always hold the unit vertically when testing a loop system as this matches the
coil orientation in a hearing aid.
•Try using new batteries.
Signal is heard, but HI / LO LEDs do not illuminate (ILR3+ only)
•Ensure unit is used in correct orientation – this is usually vertical.
•Try different locations and heights in the room / area.
•Check loop installation. Did the system ever reach these levels before?
•Try using new batteries.
ILR3+ rear panel guide to
measuring field strength

Specification – ILR3 & ILR3+:
Frequency Response:
Flat: 85Hz - 6kHz ± 0.5dB
Low Cut Filter: 400Hz - 8kHz -3dB (similar to a hearing aid)
Output: 3.5mm stereo jack socket – enables power when used.
For use with stereo headphones (min 25per side).
100mW into 16, <0.5% THD @ 1kHz
Environmental: IP30, -10°C to +45°C, 20 – 90% relative humidity
Dimensions: 62 x 26 x 112mm,
90g (excluding batteries and headphones)
Power: 2 x Alkaline AA / LR6 batteries
<0.1W 1.8V to 3.2V, >100 hours usage.
Specification – ILR3+ only:
Magnetic field strength indication to PPM type II referenced to 400mA/m RMS:
‘Good’ ≥0dB Green LED 400mA/m RMS with sine
‘Okay’ ≥-6dB Amber LED 200mA/m RMS with sine
These levels are suggested by IEC 60118-4:2006 for such an indicating device.
Warranty information
This product carries a 5 year parts and labour warranty which could be invalidated
if these instructions are not followed correctly, or if the unit is tampered with in any
way. The 5 year warranty is dated from the time the equipment leaves Ampetronic
and NOT when it is installed. The headphones carry a 6 month warranty against
faulty manufacture.
The ILR3 and ILR3+ are designed and engineered in England.
Declaration Of Conformity
The manufacturer: Ampetronic Ltd., Northern Road, Newark, NG24 2ET United Kingdom
Declares that the products: ‘Induction Loop Receiver’ Type Names ILR3 & ILR3+
Conforms to the following Directive(s) and Norm(s):
Directive 2004/108/EC EMC: EN 55103 (1&2):1997
Directive 2006/95/EC Safety: EN 60065:2002
January 2008 - L.A. Pieters - Technical Director, Ampetronic Ltd.
Ampetronic Ltd., Northern Road, Newark. NG24 2ET. United Kingdom
Tel: [phone] Fax: [phone]
www.ampetronic.com Email: [e-mail]
UP11901-6