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Document No DCP0002129 TC 26/03/02 Rev 4 

Page 6 

PDA200E Induction Loop System - 

Installation Guide

 

 

2 m 

2 m 

0.75 m 

Loop Amplifier 

Overall length 

Overall 

width 

The amplifier may be connected 
to any point on the loop 

Installing the Loop Cable 

The loop cable should be laid in a single turn and wired into the Termination block as shown in  the diagram 
on page 2 of the manual.  

In the vast majority of cases loop cables are normally mounted horizontally around the perimeter of the room 
to be covered, either at ceiling or floor height. They may also be installed under carpet by using flat loop    
cable.  

Do not install the loop cable closer than 1.2M to a hearing aid position

 

Overspill and more complex installations 

The magnetic field is not confined to the area 
within the loop and the signal may be heard in ad-
jacent areas such as a corridors and up to three 
times the width of the loop away. 

If this is a problem there are special designs of 
loop that can reduce the overspill field. 

The AFILS British Standard (BS 7594) suggests 
several technically complex solutions that are 
reasonably effective but are rarely employed due 
to high cost. 

A low-cost but effective method to reduce overspill 
is to make a smaller loop, typically in the centre of 
a room. The smallest practicable loop for floor or 
ceiling mounting  (up to 3 metres high) is 2 metres 
square. This will provide a reasonable field at head 
height above the loop and up to four metres away 
in all directions.  

This loop may be installed above a suspended  
ceiling or in plastic conduit in the floor. Flat cable 
may be used under carpet. 

In larger installations overspill can be reduced by 
laying the loop in an ‘electric grill’ pattern. Each 
pattern can be considered as a many pronged fork. 

The pattern should be spaced approx. 2m from the 
nearest wall / next pattern, prongs of the fork should 
be spaced approx. 2m apart and should be approx. 
2m wide, prongs should extend approx. 0.75m off 
the base of the fork. 

If the loop user is confined to a bed (for example in 
a hospital or a nursing home) then the loop pattern 
should take into account the position of the user and 
the field strength of the loop and a loop pad may be 
the simplest solution.

 

Содержание PDA200E

Страница 1: ...ions at our discretion and without prior notice E OE Technical Features The PDA200E is a current mode induction loop amplifier with the following features Up to 120m2 coverage ideal for most applications Straightforward internal screw connections Ideal for electrical contractors no audio connectors Wall mounted for permanent installation Internal controls avoid user tampering Mid range tone contro...

Страница 2: ...oop Example Installation This schematic shows an example system which utilises a desk mounted microphone AMT wired direct into the PDA200E two wall mounted mics APM and a 100V line feed from a public address system The alert trigger has been wired to a doorbell which when activated plays a 2kHz tone through the loop ...

Страница 3: ...mpliance of the system as a whole Equipment guarantee This equipment is not guaranteed unless the system is installed and commissioned in accordance with national standards by an approved and competent person or organisation General precautions Do not test wiring with an insulation tester Megger with any equipment connected as the 500 Volt test voltage will destroy these devices totally Unpacking ...

Страница 4: ...V input is used these wires must also be segregated from the other inputs Mains Wiring Connect mains to the PDA200E The 230V a c cable MUST enter the enclosure via one of the knock outs at the top right hand corner of the enclosure This equipment requires fixed wiring using three core cable no less than 0 75 mm2 and no more than 2 5 mm2 fed from a 3 Amp fuse spur fitted with an all pole isolating ...

Страница 5: ...ach plate omitting the V connection Fitting Outreach Plates Up to five Outreach plates can be daisy chained together connected as a single line level input Mounting Outreach plates Outreach plates are supplied with cable and glands They are to be surface mounted on a 25 mm single gang box 1 Run the 2 pair screened audio cable supplied in kits from the PDA200E to the first Outreach plate and secure...

Страница 6: ...British Standard BS 7594 suggests several technically complex solutions that are reasonably effective but are rarely employed due to high cost A low cost but effective method to reduce overspill is to make a smaller loop typically in the centre of a room The smallest practicable loop for floor or ceiling mounting up to 3 metres high is 2 metres square This will provide a reasonable field at head h...

Страница 7: ...control is used to set the input level into the amplifier Apply a typical audio source such as a CD or test signal and adjust so that the limit indicator on the front panel just comes on then move back approximately 1 8 of a turn If this indicator is either on constantly or not on at all with the signal present then the amplifier may need further adjustment If this level is set too high then the l...

Страница 8: ...or wall ceiling APJ 3 5 mm mono jack plate for unbalanced microphones APX XLR plate for hand mics mixing desks APL line level for TV sets or other audio Up to 5 Outreach plates can be daisy chained together as illustrated below Accessories Available separately AMT Tie Clip Desk mic AMH Handheld mic AML Lectern mic AMD Desktop mic AMP Phantom powered condenser microphone AMR Handheld or Lavaliere r...

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