Bosch LBB 1968 Instrukcja Użytkownika Pobierz pdf (Strona 25)

52 | Plena Range

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Communication

PLN-1LA10 Plena Loop Amplifier

The Plena Loop Amplifier is a cost-effective amplifier designed to

drive a wire loop installed in the floor or ceiling of a venue up to

600 m

per amplifier. This solution enables hearing-aid users in

the area enclosed by the wire loop to hear all announcements,

soundtrack or music. Hearing-aid users can set their devices to

the T-mode setting to receive the signal coming from the loop to

receive excellent audio-quality announcements, without the

background noise or reverberation that normally impairs

intelligibility for people with hearing difficulties.

Features

• High power current driven amplifier

• Two mic/line inputs, one priority input (100 V)

• Selectable frequency range and tone controls

• Limiter and Automatic Gain Control (AGC)

• Integrates in an IEC 60849 compliant system

Functions

The loop amplifier can be connected to a mixing amplifier’s line

level output, or it can accept up to two microphone/line signals

directly. A 100 V priority input is available for uplink to a voice

alarm system. This input can be monitored for the presence of a

pilot tone. The built-in supervision monitors all key functions of

the loop amplifier, and the fault state is available on a fail-safe

relay. This means it is possible to use the Plena Loop Amplifier in

an IEC 60849 compliant system and include the induction loop

in the supervised transmission paths.

For added ease of use the Plena Loop amplifier is fitted with a

limiter to limit the output field strength to the prescribed

100 mA/m. This circuitry can also be set to function as an

Automatic Gain Control (AGC), so those soft signals are

boosted for intelligibility while loud signals are attenuated so that

all information is presented at a comfortable listening level.

To adjust the sound to the program material and the

environment, tone controls and a metal loss compensation

circuit is available. After installation the controls can be locked to

prevent unwanted access.

Even though one Loop Amplifier can cover up to 600 m

, the

Plena Loop Amplifier is stackable (master/slave configuration),

to cover very large areas. Also, low spill schemes are supported.

Its unique quadrate configuration provides uniform field

strengths over multiple loops.

Parts Included

Certifications and Approvals

Quantity Component

1 PLN-1LA10 Loop amplifier

1 Mounting brackets

1 Power cord

1 Plena CD

EMC emission acc. to EN 55103-1

EMC immunity acc. to EN 55103-2

Safety acc. to EN 60065

Induction Loop Systems Acc. to EN 60118-4

Acc. to IEC118-4

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