Listen Technologies ILD1000G User Manual

ILD1000G Installation Handbook

TO PREVENT ELECTRIC SHOCK DO NOT REMOVE THE

Handbook Contents

• Safety

• Introduction

• Quick Start

• Installation

• Overview

• Troubleshooting

• Accessories

• Technical Specifications

• Warranty

• Declaration Of Conformity

SAFETY

This symbol is used to alert the user to important
operating or maintenance instructions.

The Lightning bolt triangle is used to alert the user
to the risk of electric shock.

1. It is important to read these instructions, and to follow them.

2. Keep this instruction manual in an accessible place.

3. Clean only with a dry cloth. Cleaning fluids may effect the equipment.

4. Do not block any ventilation openings. Install in accordance with the

5. Do not install this equipment near any heat sources such as radiators, heating vents

6. WARNING – THIS APPARATUS MUST BE EARTHED / GROUNDED.

7. Only power cords with the correct power connector may be used to maintain safety.

8. Refer all servicing to qualified personnel. Servicing is required when the apparatus

9. WARNING – To reduce the risk of fire or electric shock, do not expose this

manufacturer’s instructions.

or other apparatus that produces heat.

Cables incorporating the UK 13A fused plug, Schuko with earthing contacts and UL
approved “grounding type” are acceptable. These must be plugged into power outlets
which provide a protective earth.

has been damaged in any way, such as a power supply cord or plug is damaged,
liquid has been spilled or objects have fallen into the apparatus, the apparatus has
been exposed to any rain or moisture, does not operate normally or has been
dropped.

apparatus to rain or moisture. The apparatus shall not be exposed to dripping
or splashing and no objects filled with liquids, such as vases, shall be placed
on the apparatus.

Box Contents

1 x ILD1000G
1 x Loop connector
1 x Status socket connector
1 x ‘Installation Handbook’
2 x 1U Rack mounting ears
1 x Power cable
1 x Deaf logo

COVER. THERE ARE NO USER SERVICEABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.

1

INTRODUCTION

The ILD1000G Induction loop driver has been designed as a high quality
amplifier for use with conference rooms, stadia, theatres, sports halls,
confidential rooms, lecture halls and cinemas. Depending on a number of
factors regarding the installation of the loop and the set-up of the amplifier
the ILD1000G can provide compliance with IEC60118-4 for areas >1300m2.

Ease of installation and use have been major factors in the design,
combined with optimised performance, and the freedom from R.F.I.
generation.

The ILD1000G has three inputs. A balanced line (INPUT 3), a balanced
microphone (INPUT 1) and one (INPUT 2) which can be configured to either.
For more complex installations, you may need ancillary equipment such as
microphone pre-amplifier(s), adaptor(s) for use with 100V line, or signal
processing units. See Accessories or contact Ampetronic for advice.

QUICK START

For those who have a good appreciation of loop systems, the following is a

very quick guide to setting up the amplifier: All you need is an ac power
source, a signal source and a loop. See ‘Designing Induction Loops’
handbook (supplied) or contact Ampetronic for advice.

Installation

1. Turn all controls fully anti-clockwise.

2. Connect loop cable of appropriate length / gauge.

3. Connect signal input(s).

4. Connect power. See points 6 and 7 in SAFETY section.

5.

If rackmounted remove all rubber feet from units. DO NOT re-fit the

feet fixing screws as this may cause damage and invalidate the
warranty

Operation

6. Switch ON – check green POWER LED flashes during self test and
illuminates continuously when checks are complete.

7. Apply input signal and increase the input control until two green
COMPRESSION LEDs are illuminated on the peaks of the signal.

8. Adjust the CURRENT control until the CURRENT LED illuminate to
achieve the desired peak current.

9. Repeat step 6 for any other inputs used.

10. Listen to the magnetic field produced inside the loop area using a

receiving device (e.g. Ampetronic ILR3), or examine the performance
in more detail with a field strength meter.

11. Adjust MLC control to achieve a flat frequency response.

2

Connections

- (Signal cold)

SOURCE

Connection of 3-pole Plug

CONNECTOR

+ (Signal)

SOURCE

SLEEVE

Connection of 3-pole plug.

RECORDING DEVICE

Connection of 3-pole Plug

INPUT 1 & 2

Screen

+ (Signal hot)

3

1

2

INPUT 3

SLAVE
I/O

Balanced

Unbalanced

Connection of

male XLR

balanced

TIP
RING
SLEEVE

with balanced signals.

Use Twin-screened cable.

TIP
RING

Use Twin-screened cable.

Must be 3m or less.

TIP
RING
SLEEVE

to use Slave I/O socket

for recording output.

+ (Signal hot)

- (Signal cold)

+ (Signal)

LOOP

1
2

LOOP

1+
2+

20.00mm

8.00mm

Refer to technical
specifications for connection
details

3

Block Diagram

Must be 3m or less.

Must be 3m or less.

Input 1

Input 2

Phantom

Phantom
Power

Power
Switch

Switch

+15V+15V

Gain Boost

Gain Boost

Compression LEDsCompression LEDs

Input 1 Gain

Overload

Overload

LED

LED

Current LEDsCurrent LEDs

Overheat

Overheat

LED

LED

Loop

Loop
Error

Error
LED

LED

Input 3

230V

or

120V

AC Power

Input 2 Gain

Input 3 Gain

Power
Switch

CompressorCompressor

Power

Supply

Slave

Slave

I/O

I/O

Power

LED

Metal

Metal

Loss

Loss

Correctio n

Correctio n

+15V

-15V

0V

OutputOutput

Current

Monitor

+15V

Use cable supplied.

Use cable supplied.

0V

-15V

Output

Output

15V

150mA

DC
Output
Socket

Loop

Loop

4

INSTALLATION

Location

The unit may be free standing or 19” rack mountable using the rack ‘ears’
supplied. Fitting of the ‘ears’ is achieved by removing the two left hand side
for the smaller ‘ear’ and all three right hand side panel screws for the larger
‘ear’. The same screws are then re-used to secure the ‘ears’ in place. (A
PH2 screwdriver will be required). For 19” rack mounting the four rubber
feet must be removed.

The location must provide adequate ventilation for the unit.

An internal fan provides forced ventilation using air vents at the left side
(intake) and rear (exhaust) of the unit. Both of these vents must be
unobstructed for satisfactory cooling. If the unit is installed in an enclosed
environment, sufficient airflow into the enclosure must be provided through
vents fans or other means, such that the units exhaust air is not recycled to
the inlet – causing a reduction in output current or OVERHEAT LED to be
illuminated.

Contact Ampetronic for advice on cooling requirements for your installation.

Tools and Equipment

Small hand tools including a wire stripper and a small flat blade screwdriver
will be required.

An ILR3 loop receiver or a magnetic field strength meter is vital to check
that the loop system is providing the desired level of performance.

A pair of stereo headphones with a 3.5mm jack plug connection is also
useful to monitor the loop signal.

System Requirements

The induction loop cable itself should be already installed according to the
‘Designing Induction Loops’ handbook, or as per specific design instructions
provided by Ampetronic. As a result, a target current should be known,
based on achieving acceptable field strength across the area to be covered.

It is important that the total resistance of loop and feed must be between

0.5Ω and 10Ω (at DC). If this is not achieved, the LOOP ERROR LED will
become illuminated, and the amplifiers output will be disabled. See
Troubleshooting section for details on how correct this, and get your
system working.

The ‘Designing Induction Loops’ handbook contains more details on loop
and feed cables. The correct design and positioning of the actual loop is
vital for satisfactory system performance. If in doubt consult Ampetronic for
advice.

See next page for connection and set-up.

5

Connection and Set-up

It is advised that the loop system is initially set up using a local audio source
such as a CD player, which is not connected into any other system. This
avoids the complication of ground loops and feedback etc, whilst the unit is
set up.

The following procedure describes the installation of a stand alone
ILD1000G, and does not incorporate connection of other ancillary units such
as microphone pre-amps, mixing desks, or signal processing units.

1. Turn all controls fully anti-clockwise.

2. Connect the feed cable from the loop into the NL4 loop connector
supplied as shown:

1
2

Note: Where using a perimeter loop (floor/ceiling level), the feed cable
should be tightly twisted to avoid unwanted stray magnetic fields.

3. Connect the signal inputs appropriately:

Microphones: Suitable dynamic or condenser microphone with balanced
cable feed. Select phantom power as required. Connect to INPUT 1 and
INPUT 2 (with selector switch in the appropriate position) using a 3-pole
XLR plug wired as per Connections drawing.

Line level signals: From other audio equipment such as PA system,
mixing desk or CD player. Connect to INPUT 2 (with selector switch in
the appropriate position) using a 3-pole XLR plug and INPUT 3 using a

3-pole balanced jack plug both wired as per Connections drawing

LOOP

1+
2+

.

You may use either or all three inputs.

Do not run input and output cables close together

The SLAVE I/O must NEVER be used as a separate input. It must only
be used with Ampetronic signal processing equipment or for obtaining a
signal for recording. See Connections for details.

4. Connect AC power to the ILD1000G. See points 6 and 7 in Safety
section.

5. Switch ON. The POWER LED will flash for a few seconds whilst an
internal self-test is performed and the loop resistance is tested. If both
tests are successful, the POWER LED will illuminate continuously and
the unit will be in an operational mode. If the POWER LED continues to
flash, or the LOOP ERROR LED illuminates, consult the
Troubleshooting section.

6. Select one input and apply a suitable audio signal (ideally a CD player

6