Ampetronic DLS User manual

1
Domestic Loop System (DLS)
Induction loop system for use with Tunstall
Lifeline Connect+ and Communicall Connect
Speech Module
This manual is a detailed guide for the installation and
adjustment of the Ampetronic DLS when used with the Tunstall
Lifeline Connect+ or Communicall Connect Speech Module
Systems
IMPORTANT SAFETY INSTRUCTIONS.............................. 2
WARRANTY......................................................................... 2
DECLARATION OF CONFORMITY ..................................... 3
1THE AMPETRONIC DLS AMPLIFIER............................ 4
2. DLS COMPONENTS ...................................................... 5
3. BEFORE INSTALLING................................................... 6
4. INSTALLING THE AMPLIFIER....................................... 6
5. FITTING THE UNIVERSAL ADAPTER........................... 7
6. INSTALLING THE LOOP................................................ 7
7. CONNECTING SOUND SOURCES................................ 9
8. SETTING UP FOR FIRST USE..................................... 10
9. TROUBLESHOOTING.................................................. 12
10. SYSTEM SPECIFICATION ........................................... 13
Installation Manual
D4107126A

2
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions.
2. Keep these instructions for future reference.
3. Heed all warnings.
4. It is important to follow all instructions.
5. Do not use this equipment near to water.
6. Clean only with a dry cloth.
7. Do not place objects filled with water such as a vase near or on the
equipment.
8. Do not install the DLS amplifier near to sources of heat such as radiators,
stoves or other equipment producing heat.
9. Do not place the DLS amplifier in a fully enclosed space; ensure that the
amplifier has ventilation when in use.
10. This equipment is designed only for servicing by qualified personnel.
Servicing is required when the apparatus has been damaged or exposed to
rain or moisture, or has been dropped.
WARRANTY
This product carries a one year parts and labour guarantee which may be
invalidated if instructions are not followed correctly or if the unit is misused or used
for an unintended purpose.
Refer all enquiries relating to the product guarantees to your reseller or distributor.

3
DECLARATION OF CONFORMITY
DLS Amplifier
Manufacturer: Ampetronic Ltd.
Northern Road, Newark, NG24 2ET. United Kingdom.
Declares that: Domestic Loop Amplifier.
Type name: DLS.
Conforms to the following directives and norms:
Directive 2004 / 108 / EC EMC directive.
- EN61000-6-1:2007 Immunity.
- EN61000-6-3:2007 Emissions.
Directive 2006 / 95 / EC The low voltage directive.
- EN60065:2002.
November 2007
Leon Pieters, Technical Director
Ampetronic Ltd.
Universal Adapter
Manufacturer: Ampetronic Ltd.
Northern Road, Newark, NG24 2ET. United Kingdom.
Declares that: Telephone isolation unit.
Type name: Universal Adapter.
Conforms to the following directives and norms:
Directive 2004 / 108 / EC EMC directive.
- EN61000-6-1:2007 Immunity.
- EN61000-6-3:2007 Emissions.
Directive 2006 / 95 / EC The low voltage directive.
- EN60950:2006.
July 2008
Leon Pieters, Technical Director
Ampetronic Ltd.

4
1. THE AMPETRONIC DLS AMPLIFIER
FEATURE
DESCRIPTION
1. TONE CONTROL Tone control, normal response with knob at centre and marker
pointing up. Adjust to give your preferred sound.
2. VOLUME CONTROL To adjust volume transmitted by the loop.
3. SIGNAL INDICATOR When lit, the input level is high enough to ensure that the loop
will be loud enough. Normally on when sound is present.
4. HEADPHONE SOCKET Monitors the signal that is actually broadcast into the loop.
Useful for setting up the loop and fault finding.
5. POWER SWITCH To turn power on and off. The Ampetronic DLS can be left on at
all times, or turned off when not used as preferred.
6. POWER INDICATOR Green light, on when the unit has power and is turned on.
7. RUBBER FEET To isolate the unit from vibration and heat and provide a secure
and stable base in any installation.
8. LOOP CONNECTOR Speaker style connector for the two cable ends of the loop.
9. POWER CONNECTOR Power connector for the 12V DC power supply provided.
10. INPUT 1 Audio input with phono connectors (see section 7).
11. INPUT 2 Audio input with phono connectors (see section 7).
12. INPUT 3 (ALERT)
SWITCH
Selects line level (right) or microphone (left) for input 3. Select
LINE position for Tunstall equipment.
13. INPUT 3 (ALERT)
LEVEL ADJUSTER
Adjusts sensitivity of input 3, setting the level at which a noise
will trigger the alert (priority) input. Set to maximum clockwise
position for Tunstall equipment.
13. INPUT 3 (ALERT) Alert input – sounds at this input will override other inputs, and
be turned off when not in use. Tunstall Equipment must be
connected here.
14. INPUT 4 LEVEL
ADJUSTER
Adjusts sensitivity of microphone input 4 as required.
15. INPUT 4
(MICROPHONE)
Microphone input for electret style microphone (provided) with
minijack input.
1 2 3 4 5 61 2 3 4 5 6
7 8 9 10 11 12 13 14 14 157 8 9 10 11 12 13 14 14 15
quote text box.]
Fig 1

5
2. DLS COMPONENTS
The DLS kit contents:
•DLS amplifier and instructions (1)
•33m loop cable and cable clips (2)
•1 x Clip microphone and cable (3)
•1 x Mini-jack to phono cable (4)
•1 x phono cables (5)
•1 x power supply (6)
Universal Adapter Kit
•1 x Universal Tele adapter (7)
•1x Cable A (RJ11 – RJ45)
•1x Cable B ( RJ11 – JST PA 0.1)
•1 x Cable C ( Audio 3.5mm Jack)
Additional accessories
Available through your local dealer.
•Chair pad (8)
A 40cm square pad to place
under or in a cushion on a chair
or sofa, to create a local field for
one person, often instead of
using the room loop cable.
•SCART adapter (9)
To connect a television to the
amplifier using a ‘through-
SCART’ connection that does
not affect your existing SCART
connections.
•Additional cables and
microphones.
(1)
(2)
(3) (4)
(5) (6)
(7) Universal Adapter
(8) (9)
Fig 2
Cables not shown

6
3. BEFORE INSTALLING
Before the DLS system is installed
please check that the environment is
suitable.
Background noise
Occasionally poor quality electrical
systems can create interference.
Before installing the DLS, use a
receiver such as the ILR3+ to listen to
the background magnetic noise or
measure it using the Ampetronic Field
Strength Meter (FSM). If the
background magnetic noise is too
high, (greater than -22dB, A weighted)
the system should not be installed.
If the background magnetic noise is
greater than -32dB the customer
should be consulted.
Other loop systems
The DLS loop system will create a
strong signal within the area of the
loop. There is also a much weaker
signal that carries up to 3 times the
width of the loop away from where the
loop is installed. This can occasionally
cause a problem if:
- there is another ‘room loop’
induction loop system in use within
this distance – in which case, there
may be crosstalk between the two
systems.
- the system is used for confidential
or private conversations with
microphones or the telephone.
If these issues are anticipated then a
chair pad can be installed instead of a
room loop. See Chair Loop Installation
instructions.
4. INSTALLING THE
AMPLIFIER
Fig 3
Where to position the DLS amplifier?
The DLS amplifier should be placed in an
accessible location and within a suitable
distance (see cable lengths above) from:
•the Universal Adapter.
•the sound sources to be connected
e.g. TV.
•the Lifeline Connect+ or Speech
Module.
•the microphone (if used).
•240V AC power outlet for DLS.
•240v AC power outlet for Connect+.
This location must be dry and well
ventilated.
The DLS amplifier must not be covered.
Installing the amplifier
Having found a suitable location, set the
amplifier in position either free standing or
wall / panel mounted – see below for wall
/ panel mounting instructions.
Lifeline
Connect+
Or
Communicall
Connect
Speech
Module
Cable A, (Length 2.5m)
Cable B, (Length 2.5m)
Cable C, (Length 1.2m)
Cable to TV, (Length 5m)
Power Cable, (Length 2m)
Mic cable, (length 3m)
3
1
2
.
TV
A or B
C
Mic
1/2
4
Universal Adapter

7
Wall / panel mounting
Included in the DLS amplifier box is a
template for marking out the two screw
holes.
Decide on the location for the DLS
amplifier and use the template to mark
out two screw holes. Put two screws in
place (screw heads should be 6-8mm
diameter). Leave the screw heads
protruding by 8-10mm from the wall.
Hang the DLS amplifier on the screw
heads using the holes on the bottom
of the case.
Fig 4
5. FITTING THE
UNIVERSAL ADAPTER
The Universal Adapter must be used
to interface the DLS to the Lifeline
Connect+ or Speech Module with the
cables provided.
It can be fixed in place with an
adhesive pad or by using the fixing
holes as shown
The Universal Adapter can be mounted
to a wall or other surface using two No.6
screws (3.5mm). Fixing dimensions are
given on the rear of the Adapter box.
Unscrew the two pozi screws on the front
of the Adapter and remove the front
cover. Do not touch any of the internal
components. Secure the Adapter using
the two No.6 screws (not supplied) and
re-fit the cover.
Fig 5
6. INSTALLING THE LOOP
Room loop installation
Provides optimum coverage for listening
when moving, standing up or in different
locations within the room.
A room loop is a loop of wire usually
placed around the wall or skirting board.
A wire can also be used around a smaller
area underneath carpet or a rug. The loop
must cover the whole area in which the
user needs to hear the sound from the
DLS induction loop.
A room loop is simple to install and can
be fixed in place using the cable clips
provided, or other fixing method.
•Decide what the area is that needs to
be covered by the cable.
•Start with one end of the cable at the
DLS amplifier.
•Run the cable from the cable reel
provided around the edge of the area
that is to be covered. Typically this
will be the edge of a room.
•Use cable clips (provided) to secure
the loop cable, or place the loop
cable underneath a rug or carpet.
•The cable should ideally be fitted at
floor or ceiling level, never at head
height. Fig 6 shows both options as a
green and a red loop.
Fig 6

8
•Cable can run over doorways to
prevent trip hazards, see the red
loop in the diagram.
•Run the free end of the cable
back to the DLS amplifier.
•Cut the cable to length. This must
be at least 8m long for the system
to operate.
•Connect the cable ends to the
amplifier. See Connecting the
Loop to the Amplifier.
•The room loop is now installed.
Chair loop installation
The Chair Loop pad is an optional
accessory. It is supplied with 5m of
detachable cable for easy installation.
Make sure that the pad can be placed
under or behind the chair to be used
and the cable can be run safely from
the chair to the DLS amplifier.
•Place the pad in one of three
places: under the seat cushion;
behind the seat back; or inside a
seat cushion (seat or backrest).
Run the connecting cables to the DLS
amplifier.
•Cover the
cable with
a rug or
other
protection
to prevent
tripping or
catching the cable.
•Connect both ends of the loop
cable to the DLS amplifier. See
Connecting the Loop to the
Amplifier.
•The chair loop is now installed.
Connecting the loop to the amplifier
Once the loop has been installed the two
cable ends must be connected to the loop
connector on the DLS amplifier (shown
below).
First, terminate the cable
ends if required so both
cable ends have 5-15mm
of exposed cable:
The connector has two
holes above a red and a
black switch. When the
switches are pushed down the hole is
open, when the switched is pushed up the
hole is closed and the loop cable will be
clamped in place.
Connect one end of the cable to the black
terminal of the DLS amplifier:
•Push the black terminal of the loop
connector down.
•Put the cable end into the hole above
the black switch.
•Lift up the black switch to capture the
cable in place.
Connect the free end of the cable to the
red terminal of the DLS amplifier in the
same way.
Check that both loop wires are securely
held by the connector on the DLS
amplifier.
Fig 7
Fig 8

9
7. CONNECTING SOUND
SOURCES
The Ampetronic DLS can accept up to
3 additional inputs simultaneously with
the Lifeline Connect+ or Speech
Module.
Inputs 1 and 2 (line inputs)
Up to two of the following items can be
connected:
-Television
-HiFi
-Radio
-Computer audio
-iPod / MP3 player
•Select the appropriate cable for the
equipment, minijack, phono or
SCART (optional accessory).
•Connect the two phono jacks to the
connectors of input 1 or input 2 and
the other end to the equipment.
Input 3 (alert input)
•This input is reserved for the
Lifeline Connect+ or the Speech
Module. It is a priority input. If a
signal is present on this input all
other signals will be turned down.
•Locate the switch on input 3 on the
rear of the DLS amplifier and make
sure that it is in the line input
position.
•The Tunstall system is connected to
the DLS unit through the Universal
Adapter.
•To connect the Lifeline Connect+,
cables A and C are used with the
Universal Adapter.
•Connect the RJ45 and the two loose
wires of Cable A to the Lifeline
Connect+ as shown below:
Note. These wires are not polarity
conscious.
•To connect the Speech Module, cables
B and C are used with the Universal
Adapter
Input 4 (microphone input)
This input will accept one microphone.
The microphone can be used for:
-Room sounds, e.g. speech
-Television or other loudspeaker
•Mount the microphone so that it can
pick up the desired sounds. Use the
adhesive pad to attach to the
loudspeakers or any other surface.
•Connect the microphone jack to input
4 of the DLS amplifier.
Fig 9
Cable B

10
8. SETTING UP FOR FIRST
USE
Although not essential, it is
recommended that the field strength of
the system is set up to the IEC
standard level used for hearing aids.
Set the controls for inputs 3 and 4 and
the volume control to minimum. Set
the tone control to the mid position.
Plug the unit into power using the
power cord, and turn the unit on at the
front panel switch. The green light
should come on when there is power.
The yellow light (3) will glow for a few
seconds and go off. This is normal.
•TO SET UP FIELD STRENGTH
using the field strength meter.
Tools
•Field strength meter (FSM).
•MP3 or CD player with
headphone output.
•Cable 4 (supplied).
•Test signal:
Pink noise with 1 kHz tone.
•Tippex or other semi-
permanent marker.
Method
Connect the audio player to input 1
and play test signal 1. The yellow light
3 should illuminate and stay lit. If not,
turn up the volume of the audio player
until the light comes on. (The
compression circuit of the DLS is now
active).
With the field strength meter turned on
and switched to ‘Field Strength’,
measure the field strength at the
typical listening position of the
user, at head height (Possibly a
favourite armchair). Now adjust the
volume control on the DLS until the
meter reading jumps between
readings of -6dB (pink noise playing) and
0dB. (1 kHz sine wave bursts). The field
strength is now set to the IEC60118-4
standard. Mark the position of the volume
control with tippex or other suitable semi-
permanent marker. DO NOT MAKE ANY
FURTHER ADJUSTMENTS TO THIS
CONTROL.
Disconnect the player and connect the
required source(s), TV, HiFi etc., to inputs
1 and 2.
•TO SET UP FIELD STRENGTH
Using the ILR3+ loop listener
Tools
•ILR3+.
•MP3 or CD player with
headphone output.
•Cable 4 (supplied).
•Test signal: Pink noise.
•Tippex or other semi-permanent
marker.
Method
Connect the audio player to input 1 and
play the test track. The yellow light (3)
should illuminate and stay lit. If not, turn
up the volume of the audio player until the
light comes on. (The compression circuit
of the DLS is now active).
With the ILR3+ turned on and volume
setting as required, observe the field
strength at the typical listening position
of the user, at head height (Possibly a
favourite armchair). Now adjust the
volume control on the DLS until the green
and amber LED’s on the ILR3+ flicker
(See ILR3+ user instructions).
Note: ILR3 and ILR3+ audio induction
loop receivers are available from
www.ampetronic.com.

11
The field strength is now set
approximately to the IEC60118-4
standard. Mark the position of the
volume control with tippex or other
suitable semi-permanent marker. DO
NOT MAKE ANY FURTHER
ADJUSTMENTS TO THIS CONTROL.
Disconnect the player and connect the
required source(s), TV, HiFi etc., to
inputs 1 and 2.
•SET UP INPUTS 1 & 2
Using inputs 1 or 2 turn on one of the
connected sound sources and make
sure that it is producing sound.
The yellow light should come on
permanently or intermittently. If not,
then the input is too quiet. Change the
programme material or turn up the
input level until the yellow light comes
on.
•LISTEN AND SET VOLUME &
TONE
Set up your receiver, FSM or ILR3+ to
receive the loop signal.
Listen to the system in the normal
listening position, holding the receiver
at head height. The volume should be
OK (This was set to standard in the
previous section). Adjust the tone
control to suit.
To set up input 2, repeat the process
above. Make sure that there are no
other input signals present.
•SET UP ALERT INPUT 3
Input 1or 2 must be connected and
running with a continuous sound.
•SPEECH MODULE
Ensure Input 3 level adjuster on DLS
is in the maximum position and ensure
the switch is in the Line position.
Using the Ampetronic ILR3+ receiver
or FSM, with headphones, listen to the
source material playing on input 1or 2.
Warn the warden not to answer a call
during testing. Press the red button on
the Speech Module and monitor the
beeps. The signal on input 1or 2, as
selected, should reduce and the beep
should be clearly audible.
•LIFELINE CONNECT+
Ensure Input 3 level adjuster on DLS is in
the maximum position and ensure the
switch is in the Line position.
Using the Ampetronic ILR3+ receiver or
FSM, with headphones, listen to the
source material playing on input 1 or 2.
REMOVE THE TELEPHONE LINE FROM
THE LIFELINE CONNECT+.
Press the yellow button on the Lifeline
Connect+ and monitor the Home/Away
message beeps. The signal on input 1or
2, as selected, should reduce and the
messages should be clearly audible.
Press the green CANCEL key several
times to cancel any alarms and then
REPLACE THE TELEPHONE LINE .
•SET UP INPUT 4
Test the level of the microphone input
(input 4) if used. Adjust the microphone
level on the back panel, if required, so the
microphone volume is balanced with the
other sound sources.
•ADJUSTMENTS IN NORMAL DAY
TO DAY USE
The amplifier is now set correctly. Gain is
automatically controlled so you should
hear the right volume level whatever you
are listening to and you should not need
to make any further adjustments.

12
9. TROUBLESHOOTING
The Ampetronic DLS should not
require any maintenance or support.
In the event that you have problems,
please consult the list of possible
problems below before contacting your
supplier.
1. No sound / low volume
•Check that the power light (green)
is on to confirm that the unit has
power.
•Check that there is a sound being
produced by the input source.
•With an input source making a
sound, the front panel yellow light
should come on permanently or
intermittently. If not your input
level is too low.
•Check that there is a signal in the
loop using headphones in the
headphone jack on the front panel
– if not then there is a problem
with the loop or there is no input
signal.
•Check the loop connections – are
both loop ends connected firmly
and the cable ends are properly
terminated with exposed wire in
the contacts?
2. Interference / hum / background
noise in the loop
•Check the hearing aids / receivers
are set correctly.
•Turn the loop system off and
check to see if background noise
remains. If it does then the noise
may be created by other electrical
systems. Try turning off nearby
appliances to find the source of
interference. Noise may also
come from another nearby loop
system – are there any other loop
systems within 10m of your
system?
•If a microphone is connected to
input 4, turn the level control down
or disconnect the microphone –
does the background noise
remain? If not, reduce the noise
being picked up by the
microphone or reduce the gain
control on input 4.
3. Alert input not working
•Check the connections between
the Lifeline Connect+ or Speech
Module, and Universal Adapter
and DLS
•Make sure that the volume of the
alert signal is high – Increase the
output level if possible

13
10. SYSTEM SPECIFICATION
DLS Specification
Inputs:
1 & 2. Four input Line level phono connector, fixed gain,
allowing two stereo inputs.
3. One independent mic/line input; Priority
Microphone/Line control which is switchable between Mic or
Line level. VOX switching is permanently enabled on this
channel.
4. One independent Mic input, gain control – rear panel,
allowing adjustment to the correct level.
DC Power input, 2.1mm, centre positive.
Controls:
Tone control: Independent front panel control allowing
frequency response adjustment for differing installation
variations.
Loop volume: Independent front panel control allowing
Loop output current (volume) adjustment.
Microphone input 4 gain control – rear panel.
Mic / Line input 3 gain control – rear panel.
Input specifications:
Microphone input 4:
Connector: 3.5mm mono jack socket.
One independent microphone input suitable for use with an
unbalanced electret microphone.
Input impedance: 8kΩ.
Phantom voltage: 6V via 10kΩsource.
Input sensitivity: -60dBu for maximum output
Switchable Line / Mic input 3:
Line input selected:
Connector: 3.5mm mono jack socket.
Slide switch selection.
Input impedance: 820kΩ.
Input sensitivity: Line input selected: -20dBu for maximum
output after VOX enabled at -12dBu
Microphone input selected:
Levels as per microphone input 4. VOX enabled at -53 dBu.
Line level inputs 1 and 2:
4-way phono input connector. Fixed gain.
Input sensitivity: -10dBu for maximum output.
Overload: >30dBu
Compression:
Compression Dynamic range: >36dB before overload.
(Typically 40dB).
Compression indication via amber signal LED.
Efficiency: ± 1 dB across 40dB dynamic range.
Attack and decay times optimised for speech.
Attack time: Less than 5ms; Decay time: Less than 2 seconds.
Frequency response:
80 Hz to 6.3 kHz ± 1.5dB into 1Ωload at low level, measured
as loop current with no Metal Loss correction.
Tone control:
A modified tone control allowing a flat response or bass boost /
HF cut or HF boost / bass cut, with additional HF boost to allow
compensation for distortion due to metal structures in surrounding
buildings.
Outputs
Headphone monitoring output via front panel with stereo 3.5mm
jack.
Output connection: Loop, finger operated quick connect output
connector.
Current: >2.4A
RMS
into 1Ω.
Voltage: >3.2V
RMS
.
Loop resistance: 0.3Ωto 1.0Ωresistive or 1.5Ωmaximum
reactive impedance at 1.6 kHz.
Connection: Finger operated speaker type connector.
Area coverage:
>30m
2
coverage to requirements of IEC60118-4, or use with
supplied special loop pad.
Note that the amplifier can drive loops far in excess of this size if
the full performance of IEC60118-4 is not required by the end
user.
Environmental:
Ambient temperature: -10
o
C to 45
o
C.
Relative humidity: 20% to 90%
IP rating: IP20
Ventilation: Ensure adequate ventilation is provided for the
Domestic unit as the unit becomes warm during operation.
Mounting: Unit may be mounted horizontally or vertically. Rubber
‘bump on’ feet are fitted allowing free standing.
Two screw slot fittings allowing wall mounting of the unit are
incorporated.
Physical:
Weight: 305g.
Length: 133mm.
Width: 72mm.
Height: 40mm
Power requirements:
12V DC @ 1.0A max.
Fuse fitted to PCB, type T 1.6A L
Green LED Power indicator.
AC Power adapter (Powerpax 85-2943):
Input: 100Vac – 240Vav 47 - 63Hz.
Power consumption: Standard load = 10W (1.0A
RMS
pink noise
output, as per IEC60065).
Power consumption: Quiescent = 1.0W.
Output: 12Vdc at 1.25A max.
AC Power adapter UK (Powerpax 85-2915):
Input 230Vac, 45 – 65 Hz.
Power consumption: standard load = 10W (1.0A
RMS
pink noise
output, as per IEC60065).
Power consumption: Quiescent = 2.0W.
Output: 12Vdc at 1.0A max.
Note: Above 85-2915 PSU may change to SMPSU plugtop type,
PowerPax SW3525. 12V, 1.25A.

14
Universal Adapter Specification
Direct throughput:
Input impedance: >10kΩ@ 1kHz.
Output impedance: 5 kΩ.
Gain = -6 dB.
Overload: 5V RMS @ 1 kHz.
Frequency response: 100Hz to 20kHz, -3dB.
Buffer amplifier enabled:
Input impedance: > 1 MΩ+ 120pF.
Output impedance: 1kΩ.
Gain = 5 dB.
Current consumption @ 12V DC input: 20mA.
Overload: 1.5V RMS @ 1 kHz.
Frequency response: 50Hz to 20kHz, -3dB.
General:
Distortion: <0.5% THD+N at -10dBu (245mV input).
Weight: 71g.
Dimensions: 65mm x 50mm x 35.5mm.
Ambient temperature: 0
o
C to 35
o
C.
Relative humidity: 20% to 90%
IP rating: IP30

15
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16
Manufactured by Ampetronic Ltd.
Ampetronic
Northern Road
Newark
NG24 2ET
United Kingdom
[phone] telephone
[phone] fax
www.ampetronic.com
Supplied by:
Tunstall Group Ltd
Whitley Lodge, Whitley Bridge
Yorkshire
DN14 0HR
www.tunstallhealth.com
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Contact your supplier for questions and support
UP15906-1