PDA Range 103 Installation Instructions Manual

PDA103

AUDIO-FREQUENCY
INDUCTION LOOP AMPLIFIER

The PDA103 is a true current mode, audio-frequency induction loop amplifier. It may be
surface-mounted and is designed to cover ticket counters up to 1.2m2(PDA103C kit version),
or rooms up to 50m2(PDA103R/L/S kit versions).

Safety guidelines, important notes and product safety notes........................................... 2

PDA103 kit contents ............................................................................................................... 3

Overview of the PDA103 induction loop amplifier .............................................................. 4/5

Typical PDA103C 1.2m

2

counter loop system ........................................................................ 6

Typical PDA103R/L 50m

2

small room systems ........................................................................ 7

Typical PDA103S 50m

2

domestic TV/music lounge loop system .......................................... 8

Overview of the outreach plate audio extension system ................................................... 9

Mounting the amplifier ......................................................................................................... 9

System set-up and testing ................................................................................................. 10/11

PDA103 technical specification ............................................................................................. 12

INSTALLATION INSTRUCTIONS

This equipment must be installed by a suitably skilled and technically competent
person. Please read these instructions carefully before installation.

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PDA103 Installation Instructions Approved Document No. DAU0000103 Rev 2

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PDA103 TECHNICAL SPECIFICATION

Rated supply voltage: 110 to 240Va.c. @ 50/60Hz

Rated power consumption: 18W PSU

Maximum RMS output current: 4A @ 1kHz

Maximum RMS load voltage: 5.5V
PDA103C approx. coverage area

using the TX2 pre-formed loop:

1.2m

2

PDA103R/L/S approx. coverage area
using 0.5mm2loop cable:

50m2, i.e. rooms up to approx. 7m x 7m

Recommended number of turns: Single turn

Recommended loop conductor size: 0.5mm2@ < 50m loop length

Frequency response -3dB: 120Hz to 5kHz as per BS EN 60118-4

Input signal level:

Mic: -60dB unbalanced; Line: -27dB stereo
unbalanced; Outreach: -10dB balanced.

Input impedance: Mic: 1k ohm; Line: 100k ohm; Outreach: 20k ohm.

Microphone phantom power: 12Vd.c.
Signal to noise ratio, A weighted: -62dB

Optical TOS-link receiver: Up to 24 bit, 96kHz sampling

AGC range (3dB change in output
current), reference rated I/P voltage:

10dB

AGC ratio: 20:1
Amplifier mode: True current mode

Sensitivity level controls:

Mic, Line, Digital, Outreach, Metal Compensation,
Level (all rotary pot controls are screwdriver
adjustable).

LED indicators:

Limit (Red), Peak (Red), Loop Fault (Red), Power On
(Green).

Connectors:

Mic (3.5mm mono jack socket); Line (3.5mm stereo
jack socket); Digital; Outreach (4-way pluggable
screw terminal; DC in; Loop (2-way pluggable
screw terminal).

Dimensions (H x W x D): 35mm x 135mm x 130mm (including controls)
Weight: 380g (amplifier only)
IP Rating (to EN 60529): IP40

Operating temperature: 00C to 400C

PDA103 Installation Instructions Approved Document No. DAU0000103 Rev 2

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 audio­frequency 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.

M

ic

Line

Digital

Outreach

Limit

Peak

L

Level

M

Metal
Compensation

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.

8

9

10

11

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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).