Contacta HLD7 User Manual

Hearing loop driver
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HLD7
Hearing Loop Driver
User Guide
April 2018
1

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Summary of Contents for Contacta HLD7

  • Page 1 HLD7 Hearing Loop Driver User Guide April 2018...
  • Page 2: Table Of Contents

    Controls Set-Up 14-19 Troubleshooting 20-21 Technical Specification Standards 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: Product Overview

    The HLD7 is a high efficiency hearing loop driver, meaning that it emits very little heat from its compact packaging.
  • Page 4: Connections

    5. Input 2 (Line) - Balanced XLR or ¼” 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 Connection.
  • Page 5 Audio Connections: Mic & Line XLR connector Unbalanced TRS Jack Ring Sleeve SOURCE + (Signal) Phantom Power 1: Screen/Shield 2: + (Signal Hot) 3: - (Signal Cold) Line Unbalanced Mono TS Jack Unbalanced Mono TS Jack Sleeve Sleeve SOURCE SOURCE + (Signal) + (Signal) hot - (Signal) cold...
  • Page 6: Suitable Cable Lengths (Metric)

    Suitable Cable Lengths (Metric) The tables in this section show the metric maximum cable lengths for different maximum required currents. No clipping below 1.6kHz (IEC specifications): Example: If an installed cable is 166m of 1.5mm² (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.
  • Page 7: Suitable Cable Lengths (Imperial)

    Suitable Cable Lengths (Imperial) The tables in this section show the imperial maximum cable lengths for different maximum required currents. No clipping below 1.6kHz (IEC specifications): Example: If an installed cable is 420 feet of 18AWG (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.
  • Page 8 No clipping below 5kHz (Pro): Example: If an installed cable is 406 feet of 18AWG (round) single turn and the required current noted in Step 3 (7) of Set-Up (see page 14) is 3 amps or greater, the below table indicates that the driver is clipping.
  • Page 9: Controls

    Controls Note: Before entering a driver mode or making any changes, a loop must be connected to the HLD7. Front panel overview: Shows LINE level Shows DRIVE level Shows MIC level 1 2 3 4 5 6 contacta HLD7 LINE...
  • Page 10 PHTM LOW SIG SECONDARY POWER Press both Line + and - simultaneously to enter the Engineers’ mode 1 2 3 4 5 6 1 2 3 4 5 6 contacta HLD7 contacta HLD7 LINE DRIVE LINE DRIVE CLIP CLIP CLIP...
  • Page 11 PAGE 1 allows you to select the driver operation; either perimeter, primary or secondary. Always select the driver operation mode before installing the driver in its rack mount bracket. 1 2 3 4 5 6 1 2 3 4 5 6 contacta HLD7 contacta contacta HLD7 LINE LINE...
  • Page 12 1 2 3 4 5 6 1 2 3 4 5 6 contacta HLD7 contacta HLD7 LINE LINE DRIVE...
  • Page 13 Firmware Revision Indication (PAGE 4) THIS MODE IS DISPLAY ONLY: NO SETUP CAN BE CHANGED. 1 2 3 4 5 6 1 2 3 4 5 6 contacta HLD7 contacta HLD7 LINE LINE DRIVE DRIVE CLIP CLIP CLIP CLIP PERIMETER...
  • Page 14: Set-Up

    Set-Up To ensure optimal performance of an HLD7 hearing loop driver, set-up should be performed in following order: Step 1: Background Noise Level (see page 15) Step 2: Metal Loss (see pages 15-16) Step 3: Output Level and Clipping (see page 16-17)
  • Page 15 Step 1: Background Noise Level This test should be performed prior to loop installation. Set up the FSM, ensuring that the two vertical arrows in the top-right corner of the device are placed at the correct height: • 1.2 metres (3’ 9”) for seated user. •...
  • Page 16 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.
  • Page 17 5. Use the Suitable Cable Lengths guide (see pages 6 to 8) to confirm the installed cable length is less than the value for the current that was recorded in Step 3: Output Level and Clipping (4). 6. If the cable length does not exceed the value recorded in Step 3: Output Level and Clipping (4), move on to Step 4: Field Uniformity.
  • Page 18 Step 5: Final Output Level Adjustment Disconnect the TSG. 2. Adjust the output current to the level recorded in Step 3: Output Level and Clipping (4) on page 16 by pressing the DRIVE + or – buttons; each button press alters the current by 1dB. Example: If the measured field strength on the FSM is (A-RMS) -6dB (i.e.
  • Page 19 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.
  • Page 20: Troubleshooting

    Troubleshooting Symptom Possible Fault Action I’ve adjusted the HF comp 1) The driver is working close 1) Check loop characteristics. and see no change. to maximum output so there is If response OK at 1 amp, the not enough headroom for the headroom is inadequate.
  • Page 21 1) Reduce input level setting. up too high for signal level at input jack. 2) Input signal is distorted. 2) Check signal source. HLD = Hearing Loop Driver. If no action is successful please seek assistance from your distributor or a Contacta installer.
  • Page 22: Technical Specification

    Weight 5.5lbs Construction/Finish Front & Rear: Mild Steel / Top & Bottom: Aluminium Powder Coated Black Continual improvement policy Contacta has a policy of continual improvement for its products. This means that designs and specifications are subject to change without notice.
  • Page 23: Standards

    (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. CAUTION: Changes or modifications not expressly approved by Contacta Systems Ltd or an authorised partner could void the user’s authority to operate the equipment.
  • Page 24 Local dealer: UK & ROW US & Canada +44 (0) 1732 223900 +1 616 392 3400 sales@contacta.co.uk 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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