Ampetronic ILD60 Manuale utente

1. INTRODUCTION

The ILD60 Induction Loop Driver has been designed as a very high quality

power driver for small size induction loops in semi–domestic and

semi–professional locations such as TV rooms in nursing/residential

homes, and small/medium size meeting/interview rooms. Ease of

installation and use have been major factors in the design, combined with

optimised performance, and freedom from generation of R.F.I. to meet all

future technical requirements.

To ensure compliance with all technical standards, it is essential that the

equipment shall be installed by an individual who is technically competent

in professional audio, and who has the necessary installation skills.

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 the equipment leaves

Ampetronic and NOT when it is installed.

2. PRELIMINARY INSTALLATION DATA.

2.1 Inspect the equipment upon unpacking, to ensure that the contents of the

shipping carton are not damaged.

2.2 Install the unit in the place where it will be used. Care must be taken that

this location provides satisfactory ventilation for the equipment. In order to

ensure this, the unit should not be installed in a tightly enclosed space.

Enough room must be available to permit free airflow across the

equipment. If the unit is installed in an enclosed environment, sufficient air

flow must be provided through vents, fans or other means. The amount of

heat generated depends on the loop size, and wire gauge, but can be such

that the reliability of the equipment will be reduced if the ventilation is poor.

The unit can be placed freestanding, or fixed to a wall surface by means of

two roundheaded No. 8 wood screws fitted to suit the rear hole pattern. The

screws are positioned at 160mm separation in a vertical line. The drilling

template will assist in correct positioning.

2.3 Prepare the input signal connection as described in section 3.

2.4 Connect the loop cable to the rear Loop Terminals. Ensure that no stray

wire ends protrude from the terminal. The polarity of the loop is not

ILD60

INDUCTION LOOP DRIVER

important. For the sizing of the loop, see the chapter on Loop Design. It is

important that the loop cable ends will form a twisted pair in the area of the

amplifier, to reduce the magnetic field near the amplifier position.

3. INPUT SIGNAL SOURCES

3.1 The equipment can be driven from various sources, such as a

microphone, a direct connection to a TV set via a SCART style connection,

or a connection to a HiFi system.

3.2 Microphone Inputs.

Both inputs are designed to be used with the single-ended microphone as

supplied with the equipment. Power for the microphone is supplied from

the equipment. Some single-ended electret microphones with internal

battery can be externally powered if this internal battery is removed. Many

microphones of this type are adversely affected by the extenal DC power,

even when using their internal batteries. In all these instances, careful

investigation will indicate whether a microphone is suitable.

Dynamic microphones cannot normally be used with the equipment,

because of the much lower signal level, and the DC bias which seriously

impairs the performance of the microphone. Ampetronic can supply a

special adaptor which permits the use of dynamic microphones (and

electrets which are affected by the DC bias).

The cable length on this input must not exceed 3 metres, as single–ended

microphone lines are susceptible to interference. EMC compliance is only

available for this cable length. The above mentioned adaptor converts the

input to a balanced line, which can be extended to longer distances.

3.3 Line Input.

This input to the equipment is a twin phono input, allowing a direct

connection to the Left and Right channels of the SCART signal, or the

output from a HiFi system. It is also possible to connect the line-level

output of another sound system to this input.

Again, the maximum cable length on this input should be less than 3

metres to ensure EMC compliance.

4. Voice-Controlled switching (VOX)

There are 3 mode select switches for the VOX switching features of the

ILD60. These switches are located on the top edge of the unit alongside

the input connectors. See drawing of unit.

The mode select switches enable their respective functions when in t h e

'on' position (the switch is down, towards the base of the unit).

The mode select switches may be used in the combinations shown above

to achieve the required effect.

The VOX threshold is at about 6db below the onset of compression, and as

such is automatically set by the microphone and line sensitivity controls.

5. LOOP DESIGN

The design of the actual loop is an important aspect of the satisfactory

operation of the ILD60. A number of parameters must be taken into

account, and the following design procedure will provide the correct loop in

most installations. It must be stressed that there are sometimes very

unusual circumstances which demand unusual solutions, and the installer

should then take great care over the design and installation aspects.

These instances are generally buildings with heavy metal reinforcement in

their structure, which can seriously affect the magnetic field, buildings

where several independent loops must be installed in close proximity such

as multiple meeting rooms without interfering with each other, and rooms

Switch Effect when Microphone 1 Effect when Microphone 1

Position signal is higher than signal is lower than

VOX threshold VOX threshold for > 5

1 2 3 seconds.

off off off Vox switching disabled -

all inputs operate normally

off off on Microphone 1 input on. Microphone 1 input off.

off on off All inputs attenuated by All inputs at normal

15dB except Microphone 1 levels

off on on All inputs attenuated by All inputs at normal

15dB except Microphone 1 levels except Microphone 1

input off

on X X Reserved for future use.

which are subject to heavy disturbing magnetic fields (close proximity of

electricity supply transformer stations, etc.).

5.1 Loop Position

For optimum evenness of magnetic field, it is advisable that the loop plane

should be displaced from the normal hearing (listening) plane by some 1-

1.2 metres, and this is normally achieved by placing the loop at floor level

or at ceiling level. Whenever possible, avoid the installation of the loop

cable at or near listening level.

5.2 Loop Size

The limiting loop size is defined by the following graph.

Measure the length and width of the room, and check that this area is

smaller than that defined by the limiting curve of the graph.

5.3 Choice of loop Cable

Please note that the Ampetronic Loop Drivers have been designed to

operate into single turn loops,and must not be used with old–fashioned

multiturn loop layouts. Unusual or special loop layouts may only be

used with the express approval of Ampetronic Ltd. to ensure

compliance with all technical standards.

The maximum DC resistance of the loop should be less than 1 Ohm for

optimum performance, but should be greater than 0.25 Ohm. Maximum

cable length (i.e. total length of cable, end to end, including feed /

connecting cable) for this limiting resistance is as follows:

0246810 12 14

Loop Length

Loop Width

ILD60

Limiting Curve

Cable size Minimum Maximum

section length (m) length (m)

² 7 28

0.5 mm ² 10.5 42

0.75 mm

1 mm 14 56

² 21 84

1.5 mm

18 mm Flat Cable 25 100

Normal stranded, or solid–cored cable can be used. A suitable cable for

most applications is standard 'Tri-rated' cable to BS6231, CSA, UL

approval. Flat copper foil tape is available from Ampetronic for installation

under carpets.

The cable from the loop to the ILD60 output terminals MUST be a twisted

pair. If this is longer than 10 metre, contact Ampetronic.

6. LEVELADJUSTMENT

6.1 Initial setting up

During the initial commissioning of the equipment it is essential that the

following procedure be used to ensure a satisfactory end result. Turn the

Microphone, Line and Drive controls fully anti-clockwise, i.e. minimum

signal, and set the Tone Control to mid-range position. Provide a

continuous input signal, preferably from a small tape player with wideband

music, connected to the line input.

Increase the LINE control until the compression LED illuminates under

peak signal conditions. This establishes a reference level for the output

power driver. Increase the DRIVE setting until the desired output current is

achieved. If no reading is obtained, check for loop continuity. If a standard

Field-strength measuring unit is available, then check that the field has the

correct strength. From this point onwards, the DRIVE control will not need

re-adjusting, as this only affects the peak field strength.

Connect the cable from the audio system to the line input, and readjust the

input gain control for optimum compression. If only the microphone input is

used directly, without another sound system, then set up the entire system

from a normal sound source activating the microphone(s).

At this point the TONE control can be adjusted to give the most pleasing

sound for the listener.

6.2 Setting of input controls - Optimising Compression - VOX levels.

In order to obtain the greatest possible dynamic control range from the

compressor, it is now necessary to establish the highest level of input

signal which the equipment may receive in the operational installation.

This will often be loud, close talking into a microphone. It should be pointed

out here that background hum and noise from equipment earlier in the

chain, such as a sound or TV system may sound very troublesome when

subjected to some 20-36db extra amplification. When this occurs, the gain

must be kept at a lower, acceptable level. Where the dominant signal is

music, then it may be important to keep the compression level low, to

prevent serious degradation of the music dynamics. Experience will

indicate which level to use.

REMEMBER: once the DRIVE control has been set, only adjust the GAIN

control, as otherwise the correct operation of the equipment is impaired.

To adjust the VOX switching level, set up the equipment with the switches

in the desired configuration, with Microphone 1 control at minimum. Set up

the equipment for correct signal levels on the other inputs. Increase the

setting of Microphone 1 until the desired input signal level operates the

VOX switching, and the output signal from this input is correct. A typical

application for this could be with the microphone fixed to the side of a

telephone, so that the ringing will trip the switching, while the normal

background noise is suppressed.

7. GENERAL INFORMATION

7.1 Difficulties

If you have any difficulties in calculating the loop design, or experience

difficulties with the operation of the equipment, then contact your supplier

or Ampetronic Ltd. It is useful to have all the relevant data available when

contacting our technical staff who will be pleased to help you. The following

are known trouble areas:

– Strong hum field, mainly from fluorescent light fittings, or electrical wiring

where current flow and return are not in the same cable or duct

– Loop cable installed in a manner where it is in close proximity to

microphone (or other audio) cables for an appreciable length. Telephone

cabling can also be very sensitive to this coupling.

8. TECHNICAL SPECIFICATION

8.1 Microphone Inputs: Suitable for use with externally powered electret

microphones

8.2 Line Input: Impedance 60kW each side, 20kWdifferential.

Sensitivity: matched to normal SCART signal levels.

8.3 Loop Current: 4A Peak signal current into SINGLE TURN loop

Monitoring via front panel LED, which indicates current peaks.

8.4 Loop Resistance: must be less than 1W.

8.5 Compression: Compression range 36dB before overload. Front panel

indication. Attack and Decay time constants optimised for speech.

8.6 Frequency response: 80Hz to 5kHz ±1.5dB at low level, measured as

loop current. High frequency high signal level response is a dynamic

variable and is a function of loop size, loop current and signal content to

ensure that no RFI generation takes place. Internal time constants are very

short.

8.7 AC Power input: 230V AC operation, 50-60Hz. Power consumption 18W.

Max. Factory modifiable for 115V operation.

8.8 Dimensions : Length: 216mm Width: 124mm Height: 44mm

8.9 Weight: 1.3kg.

The ILD60 is designed and manufactured in England by Ampetronic Ltd.

8UP10401-4

DECLARATION OF CONFORMITY

Manufacturer: Ampetronic Ltd.

Address: Northern Road, Newark,

Nottinghamshire, NG24 2ET.

United Kingdom.

Declares that the product:

Description: Induction Loop Driver

Type Name: ILD60

Conforms to the following Directive(s) and Norm(s):

Directive 89/336/EEC

EMC: EN55103 (1 & 2) 1997

Directive 73/23/EEC

Safety: EN60065 (1995)

September 2000

L.A. Pieters

Managing Director

Ampetronic Ltd.

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