SAFETY GUIDELINES
Avoid placing the PDA103 amplifier in areas:
• with poor ventilation • exposed to direct sunlight
• with high ambient temperatures • adjacent to heat generating equipment
• with high humidity or dust levels • susceptible to severe vibration
DO NOT dismantle or attempt to modify the amplifier. No user-serviceable fuses or parts are
included inside the amplifier. For repair, contact your supplier.
WARNING: The surface of this unit may become hot during continued use.
IMPORTANT NOTES
These instructions are general and cannot be considered to cover every aspect of audio-
frequency induction loop system (AFILS) design and installation.
We recommend you read BS 7594 - The Code of Practice for Audio-Frequency Induction Loop
Systems and BS EN 60118-4 - Magnetic field strength in audio frequency induction loop
systems for hearing aid purposes. Other National standards of
design/installation/commissioning should be referenced where pertinent.
This product has been manufactured in conformance with the requirements of all
applicable EU directives.
Equipment guarantee
This equipment is not guaranteed unless the system is installed and commissioned in accordance
with regional or national standards by an approved and competent person or organisation.
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PDA103 Installation Instructions Approved Document No. DAU0000103 Rev 2
© Errors and omissions excepted. No responsibility can be accepted by the manufacturer or distributors of this equipment for any
misinterpretation of this instruction, or for the compliance of the system as a whole. The manufacturers policy is one of continuous
improvement and we reserve the right to make changes to product specifications at our discretion and without prior notice.
Additional testing
Induction loop systems require careful testing and calibration prior to operation. BS EN
60118-4 - Magnetic field strength in audio-frequency induction loops for hearing aid
purposes, recommends that the achievable magnetic field strength of an induction loop
system over a ‘covered area’ should be 400 mA RMS per metre.
The most efficient way of ensuring this requirement is met is to test and set-up the system
using an FPROK induction loop test kit. This kit includes a handheld Fosmeter Pro 400mA
magnetic field strength meter and a loop listener (for measuring background noise,
frequency response and metal compensation). Contact your supplier for more information.
With the relevant audio input source(s) active, turn the
appropriate Outreach/Digital/Line/Mic level control(s)
clockwise until the red Limit indicator is flashing
occasionally.
Turn the Level control clockwise until the red Peak
indicator just lights during periods of high signal level,
i.e. when the red Limit indicator just lights.
Product Safety Note
: If the system is set up so that the
Peak indicator is permanently lit, the audio sound quality
will be distorted and the amplifier may shutdown to
protect it from overheating.
If high metal content is present in, or near, the induction
loop, the sound heard by the loop listening device may
be ‘woolly’ or ‘dull’. To rectify this problem, turn the
Metal Compensation control clockwise in small
increments until a natural balance is achieved.
Note 1: If high metal content is present, the amplifier’s
area of coverage will be reduced and further reduced as
the Metal Compensation control is turned clockwise.
Note 2: If the Peak indicator lights strongly, turn the
Level control anti-clockwise and then adjust the Metal
Compensation control. You may have to adjust both
these controls several times to achieve optimum volume
and tone.
Using an induction loop test receiver, listen to the loop
signal in all areas where coverage is required (we
recommend you use a Fosmeter Pro for this purpose, see
Additional Testing below). If the signal level is not
acceptable, adjust the Level control in small increments
until it is.
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PDA103 Installation Instructions Approved Document No. DAU0000103 Rev 2
PRODUCT SAFETY NOTES
For safety reasons, the amplifier may shutdown to protect it from overheating if too much
current passes through its sensitive protection circuitry.
This may occur when the unit’s DC power supply is connected (see Page 5, Loop Fault Indicator
for details), or if the Peak indicator remains permanently lit (see Page 11, Step 9 for details).
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