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I-AMP GPT 60-IV, Руководство пользователя

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gpt

DESIGnS

mAnUFActurinG

Excellence Through Engineering

 

-AMp

hEArING LOOp AMpLIFIErs

 

 

 

 

 

 

 
 

 

 

 

 

 

6 0 V A  I N D U C T I O N  L O O P  A M P L I F I E R

-AMP

GPT 60-IV

MIC

LIN E

MASTER

LEV EL

- 3

- 9

-1 5

0 d B

-1 2

-2 1

SI G N A L  PR E SE N T

PO W ER

O N

 

Gpt 60-Iv 

60VA INDUCTION LOOP AMPLIFIER 

 

Содержание GPT 60-IV

Страница 1: ...nce Through Engineering AMp hEArING LOOp AMpLIFIErs 6 0 V A I N D U C T I O N L O O P A M P L I F I E R AMP GPT 60 IV MIC LIN E MASTER LEV EL 3 9 1 5 0 d B 1 2 2 1 SI G N A L PR E SE N T POWER ON Gpt 60 Iv 60VA INDUCTION LOOP AMPLIFIER ...

Страница 2: ...4 What are Induction Loop Amplifiers 5 Why do we need to have Induction Loop Amplifiers 5 How do they Work 5 Planning the installation Locating Induction Loops 6 SETTING THE LOOP OUTPUT CURRENT 9 INSTALLATION RECOMMENDATIONS 10 Practical Constraints on Induction Loop Systems 10 About your induction loop amplifier 12 INDUCTION LOOP FUNCTIONS 13 ...

Страница 3: ...ost complex of projects GPT Designs has designed a complete range of induction loop products called the I AMP range The I AMP range includes Induction Loop Power Amplifiers GPT 20 20 VA Induction Loop Amplifier Small Area and Counter Loops GPT 60 IV 60 VA Induction Loop Amplifier Meeting Rooms GPT 300 300 VA Induction Loop Amplifier Large Areas Induction Loop Receivers Venue Listener Induction Loo...

Страница 4: ...nal to the magnetic field created The pick up area of a loop system is defined by a continuous loop of wire that encloses the area required A high level baseband audio signal is passed through the induction loop wire creating a magnetic field inside the loop Since the induction loop defines the pick up area the loop can be made to cover different sizes and shapes in both 2 and 3 dimensions Inducti...

Страница 5: ...path Limited volume or loudness can be obtained at the hearing aid due to acoustic feedback This is heard as squealing of the hearing aid speaker The Omni directional characteristics of the hearing aid microphone cause unwanted sounds to be mixed with the desired sounds Internal room reverberation compounds this problem The signal to noise ratio in the acoustic transmission path can be very low in...

Страница 6: ...allation Locating Induction Loops Perimeter Loops Generally simple perimeter induction loop systems require the routing of the induction loop cable around the outside of the required pick up area This area can be rectangular square or circular The closer two sides are in a rectangular layout the lower the induction loop power amplifier drive current required The induction loop may be placed at flo...

Страница 7: ...CABLE FOR DOUBLE LOOPS INDUCTION LOOP AMPLIFIER AMP GPT 60 IV AMP GPT 60 IV TRACER INDUCTION LOOP AMPLIFIER TRACER LINK ONE END OF CABLE RUNS AROUND PERIMETER OTHER END OF CABLE RUNS AROUND PERIMETER Metal Loss The Induction loop cable does not present a constant load at all frequencies of interest The impedance of the cable increases with frequency This will not cause any problems for an inductio...

Страница 8: ...ter Cable Current Rating Guide 14 Strands of 0 2mm ø 0 44 mm2 4 2 0 042 3 20 Strands of 0 18mm ø 0 51 mm2 3 3 0 033 4 24 Strands of 0 2mm ø 0 75 mm2 2 1 0 021 5 32 Strands of 0 2mm ø 1 00 mm2 1 85 0 0185 6 30 Strands of 0 25mm ø 1 50 mm2 1 14 0 0114 9 40 Strands of 0 25mm ø 2 00 mm2 0 83 0 0083 11 50 Strands of 0 25mm ø 2 50 mm2 0 65 0 0065 15 Cable Selection Step 1 Calculate the length of the ind...

Страница 9: ...ian Standard 60188 4 Magnetic Field Strength in Audio Frequency Induction Loops for Hearing Aid Purposes is 0 1 AMP Meter average with short term peaks up to 0 4 Amps meter A field strength meter can also be used to determine the background noise levels that exist in the pick up area Some sources of magnetic noise can be air conditioning equipment lighting and lighting dimming systems Often the di...

Страница 10: ...d small obstacles in the pick up area such as doors and window etc without significant changes to the generated magnetic field Practical Constraints on Induction Loop Systems Not all installations are suitable for induction loop systems Induction loop systems should not be used where confidentiality is required unless the listening area is very small The low spill over systems described below are ...

Страница 11: ...e radiated field However local areas of high noise can be generated due to the splitting of active and neutral in some wiring configurations Low spill over systems are required in some theatres and conference rooms Induction loop systems may be used in these applications with careful design Complex multi loop systems can be designed which cancel the magnetic field outside the loop areas These syst...

Страница 12: ...ER SUPPLY PO WER O N 2 4 0VAC M AINS System Block Diagram The voltage driving output of the GPT 60 IV has been designed to accommodate the higher impedance of the induction loop as the frequency is increased The GPT 60 IV is housed in a heavy duty standard 1RU rack mount chassis The unit is designed to be robust and reliable The GPT 60 IV is Inherently Safe and is designed to allow continuous oper...

Страница 13: ...hat both may be used simultaneously An internal 2 1compressor is used to reduce the dynamic range of the input audio signals This has the effect of increasing the intelligibility of normal audio programs to the hearing impaired by making small sounds louder and loud sounds quieter The GPT 60 IV incorporates an internal fast limiter to protect against exceeding the amplifier s maximum output curren...

Страница 14: ...rent is not required for all loop configurations See Setting the Loop Output Current located on page 10 Saturation distortion in hearing aid pick up coils and larger external loop magnetic leakage can occur if magnetic field strengths greater than the Australian Standard are generated 6 Power On Switch Turns mains power on to the GPT 60 IV 7 Mains Input Power Mains input power is 240 VAC 50Hz via ...

Страница 15: ... response for this measurement typically around 10kHz The voltage reading will be proportional to the following 100mV RMS Current Output 0 74 AMPS Peak LOOP OUTPUT FROM SCREW TERMINAL CONNECTOR WIRING DIAGRAM HOT PHASE HOT PHASE 9 Input Connections This Pheonix connector allows connection of all inputs unbalanced L R connector at a nominal line level of 10dBV balanced line connection at a nominal ...

Страница 16: ...mAnUFActurinG Excellence Through Engineering gpt DESIGnS mAnUFActurinG Excellence Through Engineering AMp hEArING LOOp AMpLIFIErs Gpt 300 ii Gpt 60 iv Gpt 20 AMp hEArING LOOp rECEIVErs VENUE MAstEr VENUE ASSIStANt VENUE listENEr ...

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