Contacta HLD7 User Manual Download

Page: 19 / 24

Measured Field

Strength

Output current that

will achieve 0dB

Steps to

increase Drive

Steps to

decrease Drive

6.00dB

1.00A

5.00dB

1.12A

4.00dB

1.26A

3.00dB

1.42A

2.00dB

1.59A

1.00dB

1.78A

.00dB

2.00A

-1.00dB

2.24A

-2.00dB

2.52A

-3.00dB

2.83A

-4.00dB

3.17A

-5.00dB

3.56A

-6.00dB

3.99A

-7.00dB

4.48A

-8.00dB

5.02A

-9.00dB

5.64A

Note 1:

When adjusting the output current, if a level of 3 amps is reached and

yet

the field strength is still below -6dB,

the correct field strength

will not

be achieved.

This is caused by either an incorrect loop design or installation, more

metal loss than expected or an incorrectly specified driver.

There is no need to go higher than +0dB ARMS.

Adjustment to drive current/level required based on the measured

field strength:

Summary of Contents for HLD7

Page 1: ...1 HLD7 User Guide April 2018 Hearing Loop Driver ...

Page 2: ...rols Set Up Troubleshooting Technical Specification Standards 3 3 4 5 6 7 8 9 14 19 20 21 22 23 Contacta has a policy of continuous product development therefore small specification changes may not be reflected in this manual Images labels packaging accessories and product colours are subject to change without notice ...

Page 3: ...its very little heat from its compact packaging 1 2 3 4 5 1 User Guide 2 Hearing Loop Stickers x 2 3 Rubber Feet x 4 4 Hearing Loop Driver 5 Power Supply 6 IEC Power Lead Cable Equipment A length of loop cable determined by the loop design is also required Hearing loop drivers also require ancillary equipment for audio feeds such as a microphone or sound system Plug type varies by country 6 Note F...

Page 4: ...ne Balanced XLR with switchable 12VDC phantom power or unbalanced TRS jack for electret microphone with 5VDC power via 680Ω load 5 Input 2 Line Balanced XLR or TRS jack to ohmically isolated input 6 Expansion CAUTION For connection to other Contacta systems only 7 Feature External monitor control Contacta communications processor CAUTION This is not a telecommunications port 8 NL4 Loop Output Conn...

Page 5: ...leeve SOURCE Signal GND Line Unbalanced Mono TS Jack Tip Sleeve SOURCE Signal hot Signal cold Phantom Power CAUTION Route loop output cables as far away as possible from the driver audio input cables Connect a twisted pair or quad core loop feeder cables to the supplied NL4 connector diagram below Insert into the NL4 Loop Output Connection on the rear of the driver Loop Connections ...

Page 6: ...different maximum required currents No clipping below 1 6kHz IEC specifications Example If an installed cable is 166m of 1 5mm round single turn and the required current noted in Step 3 7 of Set Up see page 14 is 4 amps or greater the below table indicates that the driver is clipping Suitable Cable Lengths Metric Current 1A 2A 3A 4A 5A 6A Cable Type Cable Length Maximum Cable Length Round Cable CS...

Page 7: ...aximum Cable Length Round Cable AWG 18AWG 1638ft 819ft 546ft 409ft 328ft 273ft 14AWG 2187ft 1093ft 729ft 547ft 437ft 364ft Flat Cable Width 18AWG equivalent 1843ft 921ft 614ft 461ft 369ft 307ft 14AWG equivalent 2912ft 1456ft 971ft 728ft 582ft 485ft Double Turn Loop Single Turn Loop Current 1A 2A 3A 4A 5A 6A Cable Type Cable Length Maximum Cable Length Round Cable AWG 18AWG 1197ft 598ft 399ft 299ft...

Page 8: ...AWG 718ft 359ft 239ft 180ft 144ft 120ft 14AWG 750ft 375ft 250ft 188ft 150ft 125ft Flat Cable Width 18AWG equivalent 922ft 461ft 307ft 231ft 184ft 154ft 14AWG equivalent 1063ft 531ft 354ft 266ft 213ft 177ft Double Turn Loop Single Turn Loop Current 1A 2A 3A 4A 5A 6A Cable Type Cable Length Maximum Cable Length Round Cable AWG 18AWG 442ft 221ft 147ft 110ft 88ft 74ft 14AWG 449ft 225ft 150ft 112ft 90f...

Page 9: ...sing the MIC or will adjust the MIC input gain adjustments are in 1dB steps LEDs show the MIC s level after fader Pressing the LINE or will adjust the LINE input gain adjustments are in 1dB steps LEDs show the LINE level after fader If input is low the LOW SIG LED will illuminate Pressing the Drive or will adjust the Drive output by 1dB steps LEDs show the approximate DRIVE level CLIP ACTIVE PHTM ...

Page 10: ...RY 2 5 5 7 5 10 contacta HLD9 CLIP ACTIVE PHTM CLIP ACTIVE LOW SIG STATUS POWER MIC LINE DRIVE PERIMETER PRIMARY SECONDARY 2 5 5 7 5 10 contacta HLD9 CLIP ACTIVE PHTM CLIP ACTIVE 20DB STATUS POWER MIC LINE DRIVE PERIMETER PRIMARY SECONDARY contacta HLD7 1 2 3 4 5 6 There are 5 PAGE settings each identified by a flashing MIC LED PAGE 1 is LED 1 PAGE 2 is LED 2 etc Press both Line and simultaneously...

Page 11: ...the driver type Ensure you have selected PAGE 1 When only this first light is illuminated and the driver is in the engineers mode press either the LINE or to change the driver type from PERIMETER PRIMARY OR SECONDARY When finished setting up the driver type press the DRIVE button to take the driver out of the engineers mode and put if back into the adjustment mode The status light will begin to fl...

Page 12: ...ACTIVE PHTM CLIP ACTIVE 20DB STATUS POWER MIC LINE DRIVE PERIMETER PRIMARY SECONDARY contacta HLD7 1 2 3 4 5 6 PAGE 3 is identified by LED 3 flashing This LED indicates that you are in the phantom power selection Pressing the LINE button turns the phantom power on pressing the LINE button turns phantom power off When you are ready to move onto the next PAGE press the DRIVE button CLIP ACTIVE PHTM ...

Page 13: ...ified by LED 5 flashing Press the LINE and LINE button simultaneously To go back to PAGE 1 press the DRIVE button CLIP ACTIVE PHTM CLIP ACTIVE 20DB STATUS POWER MIC LINE DRIVE PERIMETER PRIMARY SECONDARY contacta HLD7 1 2 3 4 5 6 CLIP ACTIVE PHTM CLIP ACTIVE LOW SIG STATUS POWER MIC LINE DRIVE PERIMETER PRIMARY SECONDARY contacta HLD7 1 2 3 4 5 6 CLIP ACTIVE PHTM CLIP ACTIVE LOW SIG STATUS POWER M...

Page 14: ...out set up record values on the provided Compliance Certificate document whenever you see the following icon The Compliance Certificate document confirms compliance with IEC 60118 4 if your values are within acceptable levels It is highly recommended that you retain a copy of the completed Compliance Certificate document for your records and provide a copy to the relevant facilities manager TSG Co...

Page 15: ...9 for seated user 1 7 metres 5 6 for standing users A tripod or similar for mounting the FSM is recommended 2 Any lights or equipment normally active in the surrounding area should be turned on to ensure an accurate testing environment 3 Set the FSM to the Background Noise mode A weighted 4 Measure and note the background noise level throughout the looped area on the Compliance Certificate documen...

Page 16: ...e to metal loss 3 Set the TSG to the 1kHz setting 4 Set the FSM to the Third Octave F 1000Hz setting 5 Adjust the line level until the only the first orange LED is turned on 6 Adjust the drive level to achieve 2 amps of output current as indicated by the driver LEDs 7 Set the TSG to the pink noise setting and record the value measured by the FSM 8 Set the FSM to the Third Octave F 100Hz setting an...

Page 17: ...urrent 2 Reduce the length of the loop 3 Use a higher diameter of cable or flat copper tape 4 Try a two turn loop 5 Use a higher voltage driver Step 4 Field Uniformity 1 Set up the FSM Ensure that the two vertical arrows in the top right corner of the FSM are placed at the correct height 1 2 metres 3 9 for seated user 1 7 metres 5 6 for standing users A tripod or similar for mounting the FSM is re...

Page 18: ... button press alters the current by 1dB Example If the measured field strength on the FSM is A RMS 6dB i e 6 presses of the button extra current will be required to achieve 0dB indicated on Note 1 Step 6 Input Signal Level Adjustment 1 Connect the system signal source 2 Adjust the input level line mic level until the last green or first orange LED is lit on audio peaks 3 The system is now set up ...

Page 19: ...56A 5 6 00dB 3 99A 6 7 00dB 4 48A 7 8 00dB 5 02A 8 9 00dB 5 64A 9 Note 1 When adjusting the output current if a level of 3 amps is reached and yet the field strength is still below 6dB the correct field strength will not be achieved This is caused by either an incorrect loop design or installation more metal loss than expected or an incorrectly specified driver There is no need to go higher than 0...

Page 20: ...e 2 Internal self test failure 1 Check loop and connections try known good loop 2 Check loop DC resistance with an ohm meter 0 33 ohms minimum The power light doesn t come on 1 Mains power absent 2 Internal failure 1 Check mains power 2 Seek assistance I can t get my driver out of adjustment mode 1 Button presses not coinciding 2 Internal failure 1 Press both buttons together to exit mode 2 As a l...

Page 21: ...e HLD input level setting The Drive level indicate current is flowing but I hear nothing in the loop 1 Shorted feeder cable unlikely 2 Loop listener not working or being used away from loop 1 Check feeder cable although the HLD will usually refuse to tune to shorted feeder 2 Check listener and location The sound is very distorted 1 Input level has been turned up too high for signal level at input ...

Page 22: ...ndant Distortion Better than 40dB inputs at nominal level Expansion Contacta interconnect Input or output to or from additional Contacta products with 90º phase shift selectable Status Volt free relay contacts SPCO Feature External monitor control Contacta communications processor interface Displays Microphone level 8 level bar graph with peak hold 6dB steps Line level 8 level bar graph with peak ...

Page 23: ...tions not expressly approved by Contacta Systems Ltd or an authorised partner could void the user s authority to operate the equipment Correct disposal of this product This marking indicates that this product should not be disposed with other household waste throughout the EU To prevent possible harm to the environment or human health from uncontrolled waste disposal and to conserve material resou...

Page 24: ...aler UK ROW 44 0 1732 223900 sales contacta co uk US Canada 1 616 392 3400 info contactainc com Contacta Systems Ltd Office 13 Dana Trading Estate Transfesa Road Paddock Wood Tonbridge TN12 6UT www contacta co uk ...

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