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HEINRICH HML-10A Operation Manual

Mixer loop amplifier
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PUBLIC ADDRESS SYSTEM
Please follow the instructions in this manual to obtain the optimum results from this unit.
HEINRICH
OPERATION MANUAL
OPERATION MANUAL
HEINRICH
HML-10A
+ 6 dB
MIXER LOOP AMPLIFIER
0 dB
-6 dB
-2 0 dB
-4 0 dB
I N P U T 1
I N P U T 2
I N P U T 3
5
5
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4
6
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7
3
2
8
2
8
2
1
9
1
9
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10
0
10
0
10
We also recommend that you keep this manual handy for future reference.
M A S T E R
B A S S
T R E B L E
5
4
6
0
0
-1
+1
-1
+1
3
7
7
-2
+2
-2
+2
8
-3
+3
-3
+3
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8
9
-4
+4
-4
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1
9
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+5
-5
+5
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10
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1 0
O U T P U T C U R R E N T
P O WE R
O N
L O O P
A G C
L I M I T E R
FA U LT
O F F
I N T E G R I T Y

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Summary of Contents for HEINRICH HML-10A

  • Page 1 PUBLIC ADDRESS SYSTEM OPERATION MANUAL OPERATION MANUAL HEINRICH HML-10A + 6 dB MIXER LOOP AMPLIFIER O U T P U T C U R R E N T P O WE R 0 dB -6 dB -2 0 dB -4 0 dB...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS 1. SAFETY PRECAUTIONS ....................3 2. FEATURES ........................5 3. NOMENCLATURE AND FUNCTIONS 3 .1 Front Panel ......................6 3. 2 Rear Panel........................7 4. OPERATION INSTRUCTION 4.1 Operation before use....................8 4.2 Basic operation (channel 1)..................9 4.5 Guidance of excluding errors................14 5.

  • Page 3: Safety Precautions

    To prevent a fire or electric shock, never open nor remove terminal to avoid electric shock. Never ground the unit case as there are high voltage components to a gas pipe as a catastrophic disaster may result. inside the unit. Refer all servicing to your nearest HEINRICH dealer.
  • Page 4 When removing the power cord, be sure to hold its plug to pull. Contact your HEINRICH dealer as to the cleaning. If dust is allowed to accumulate in the Do not block the ventilation slots in the unit's cover.

  • Page 5: Features

    2. FEATURES 1. High power current driven amplifer 2. Power output 240 watts 10A 3. Three mic/line inputs, one priority input (100 V) 4. Selectable frequency range and tone controls 5. Limiter and Automatic Gain Control 6. Integrates in an voice evacuation system 7.

  • Page 6: Nomenclature And Functions

    3. NOMENCLATURE AND FUNCTIONS 3.1 Front Panel + 6 dB O U T P U T C U R R E N T P O WE R 0 dB -6 dB -2 0 dB -4 0 dB M A S T E R IN P U T 1 IN P U T 2 IN P U T 3...

  • Page 7: Rear Panel

    NOMENCLATURE AND FUNCTIONS 3.2 Rear Panel LO OP PR IO RI TY IN PU T OU T CO M 100V FA UL T MA ST ER IN V UL ED S LA VE O UT SU PE RV IS IO N MA ST ER SL AV E MATA I L OS S...
  • Page 8 36. FAULT 32. MASTER /SLAVE Fault output terminal. It works as 'Master' when it shows “Master”;it works as 'Slave' when 37. PRIORITY INPUT VOLUME it shows “Slave”Inputs from channel Prior input terminal poteniometer. 1-3 is invalid. 38. PRIORITY INPUT 33. MASTER IN Fire alarm prior input, 100V alarm Master input terminal (775mV signal input.

  • Page 9: Operation Before Use

    4. OPERATION Operation before use: Please check whether the power voltage is consistent with the local network before turn on the power, then set the control elements as the below table (Figure 1): Note: After setting the following switchs and control parts, then input signal source, and then connected to the circuit output load.

  • Page 10: Basic Operation (Channel 1)

    OPERATION FUNCTION Operation before use: Input signal, follow the match on the polarity of the signal source wiring, otherwise it will cause the generation of machine failure phenomenon. Namely: "INPUT" 1) foot signal ground; Signal the"+";2) Signal "-" pole. Channel input selection: in the "MIC"...
  • Page 11 OPERATION Function operation Panel indicators introduction as below: "LOOP" indicator---Completed loop indicators, the indicators are green. when there is output prompt in left level indicators, but the right "LOOP" indicator is off,it means opened status. (Refer to figure 4) L00P INTEGRITY figure 5 "AGC"...
  • Page 12 OPERATION Function operation "FAULT" indicator---Faulty indicator, the indicators are red, it means thereis faulty in the device. (refer to figure 7) FAULT figure 7 "FAULT" indicator---Faulty indicator, the indicators are red, it means thereis faulty in the device. (refer to figure 7) POWER figure 8 "OUTPUT CURRENT"...
  • Page 13 OPERATION Function operation "Built in signal level"indicator---power indicator, No.+6 indicator is red, it means device output signal source exceeds standard status. (Refer to figure 10) +6 dB 0 dB -6 dB -20 dB -40 dB figure 10...
  • Page 14 OPERATION Function operation introduction: Automatic gain function: When automatic gain is dialed on AGC position, choose automatic gain, it can adjust Gain Potentiometer and choose output range: 1V-28V. Low pass function: When low pass frequency is dialed on 10K position, signal frequency start to attenuate above 10K, range about 3dB;...

  • Page 15: Guidance Of Excluding Errors

    OPERATION GUIDANCE OF EXCLUDING ERRORS CAUSE PHENOMENA 1. No power or wrong plug connection All the wires are connected 2. Fuse is burned well but novoice output 3. Volume is town off 4. No input signal 1. Overloading or short circuit Power on but alarming signal 2.

  • Page 16: System Overview

    5. SYSTEM OVERVIEW Quadrature system Principle Brief introduction (refer to figure 14/15) The loop amplifier changes incoming audio signalin an alternating electric current that is sent through the induction loop. The strength and frequency of the electric current varies with the tone and the amplitude of the incoming audio signal and generates and alternating magnetic field inside the induction loop.

  • Page 17: Quadrature System

    SYSTEM OVERVIEW A master loop amplifier (M) with one induction loop. A slave loop amplifier (S) with one induction loop. (refer to figure 16) To cover larger areas, create a basic system with multiple induction loops (refer to figure 17). figure 18 Low-spill system: A special type of quadrature systems is the...

  • Page 18: Induction Loops

    SYSTEM OVERVIEW When the distance between the floor and the induction loop is too small (less than 8% of the width) or too large (more than 20% of the width), refer to figure 20. The figure 21 shows the extra power that the loop amplifier needs to make the correct magnetic field.
  • Page 19 SYSTEM OVERVIEW Width(%) figure 19 Extra power vs. the width of the room Wire length(m) figure 22 Wire diameter vs. the wire length (copper wires)

  • Page 20: Applications

    6. APPLICATIONS REAR PANEL CONNECTIONS...

  • Page 21: Devices Connection Diagram

    7. DEVICES CONNECTION DIAGRAM...

  • Page 22: Block Diagram

    8. BLOCK DIAGRAM...

  • Page 23: Specifications

    9. SPECIFICATIONS HML-10A Model Max Output Current Rated Current Outputs Input1-3 (MIC): 2.5mV/600 , Balanced XLR input Input Sensitivity & Impedance Input1-3 (LINE): 775mV/10K , Balanced XLR input Output Sensitivity & 1V/470 , Balanced XLR output Impedancet Tone Control Bass: 10dB at 100Hz , Treble: 10dB at 10KHz...

  • Page 24: Dimension Figure

    10. DIMENSION FIGURE Unit:mm + 6 dB O U T P U T C U R R E N T P O WE R 0 dB -6 dB -2 0 dB -4 0 dB M A S T E R I N P U T 1 I N P U T 2 I N P U T 3...
  • Page 25 HEINRICH LIMITED, 71-75 SHELTON STREET COVENT GARDEN LONDON +442032860291 www.heinrichlimited.com info@heinrichlimited.com...

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