Contacta V12a Installation & User Manual

Hearing loop drivers
Hide thumbs Also See for V12a:

Advertisement

Quick Links

V7 / V12a
Hearing Loop Drivers
Installation &
User Guide
October 2017
1

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the V12a and is the answer not in the manual?

Questions and answers

Summary of Contents for Contacta V12a

  • Page 1 V7 / V12a Hearing Loop Drivers Installation & User Guide October 2017...
  • Page 2: Table Of Contents

    Hearing Loop Setup Suitable Cable Lengths Troubleshooting Technical Specifications 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

    Product Overview Our highly efficient and compact V7 and V12a hearing loop drivers are suitable for smaller facilities and venues. The V7 is a constant current hearing loop driver which powers perimeter hearing loops. The V12a is a constant current dual output hearing loop driver with integral phase shifter for phased array configuration.
  • Page 4: Components

    7. Power Supply [PS-55] 4. Signage 8. IEC Power Lead V12a 1. Rubber Feet x4 5. V12a Hearing Loop Driver 2. 5.08mm Euro-Block Connector x2 6. Installation & User Guide 3. 3.81mm Euro-Block Connector x2 7. Power Supply [PS-60] 4. Signage 8.
  • Page 5: Connections

    **V12a DC Power Input, 2.1mm 24Vdc 4.17A. Caution: Use only the provided Power Supply. 5. Loop A Output - 5.08mm Euro-block. 6. Loop B Output - 5.08mm Euro-block [V12a only]. Note: Only connect to one Line Input at a time.
  • Page 6 Connection Examples XLR to XLR (line) TRS to XLR (line) Unbalanced to XLR XLR to Euroblock (balanced) Unbalanced to Euroblock...
  • Page 7: Start-Up Tests

    Please note if using V12a: If connecting only one loop to a V12a, whichever loop connection has not been used (either Loop A or Loop B) will show as an “Open Fault” as default. This is the...
  • Page 8: Controls Overview

    3. Control Dial - Used for unlocking and making adjustments to the V12a 1. Clip Status Light - When lit, this status LED indicates the signal on Hearing Loop A is clipping (see Troubleshooting on page 23 for appropriate solutions).
  • Page 9 When in this mode, rotating the hearing loop driver’s control dial clockwise will move the screen to the next menu item and rotating the dial anti-clockwise will move it to the previous menu item. The menu options are as follows: V12a Loop Output Loop Output 2. Line Input 2.
  • Page 10 Adjustment Mode Press the control dial in to enter Adjustment Mode; the arrows on the display screen will move to a left and right position. Rotate the dial clockwise or anti-clockwise to make the adjustment. Press the control dial in to confirm the selection and return to the main menu.
  • Page 11 0.5A steps. Adjustments V7 Loop Output: Adjustment Mode V12a Loop Output: Adjustment Mode In Adjustment Mode, the real-time output current is displayed on the top line in 0.5A steps. The bottom line indicates the strength of the loop output level adjustment.
  • Page 12 Line Input The hearing loop driver’s Line Input section displays the line input level within a range of 47dB. The text on the display indicates if the correct line level has been achieved: • “Low” indicates the line level is too low for the automatic gain control to operate.
  • Page 13 Phantom Power Phantom power for a connected microphone is set off as the default setting. Adjustments Rotating the control dial clockwise or anti-clockwise in Adjustment Mode will toggle the phantom power on or off. Press the control dial once to confirm the selection and return to the main menu.
  • Page 14 Microphone Input The hearing loop driver’s Microphone Input section displays the microphone input level within a range of 47dB. The top line of the display indicates if the correct microphone input level has been achieved: • “Low” indicates the microphone level is too low for the automatic gain control to operate.
  • Page 15 V12a Only: Loop Trim When using a V12a, the hearing loop driver’s Loop Trim function allows Loop B’s output to be adjusted relative to Loop A’s output. Please note: This section is only available on the V12a. The equivalent V7 menu displays Current Output, to which adjustments can be made using the Loop Output section (see page 11).
  • Page 16 High-Frequency Compensation There are 7 levels of high-frequency compensation available to adjust for metal loss. Your hearing loop driver will have high-frequency compensation turned to the lowest setting as its default. Adjustments To alter the high frequency compensation level, enter Adjustment Mode: •...
  • Page 17: Hearing Loop Setup

    Required Equipment • Contacta Test Signal Generator (TSG) • Contacta Field Strength Meter (FSM) + Tripod Step 1: Metal Loss Connect hearing loop cables to the Loop Output connection(s) on the rear of the driver. 2. Set up the FSM on a tripod to the following height inside the hearing loop, dependent on the position of end users: •...
  • Page 18 Adjustment Mode and change the loop output current to 2ARMS (4 bars on the display screen = Just ON). 11. If using a V12a: a. Place the tripod in the centre of a segment of the hearing loop which is connected to the hearing loop driver’s Loop A output...
  • Page 19 Step 2: Output Level and Clipping Set the TSG to the 1kHz setting. 2. Set the FSM to the RMS/Peak A-Weighted Mode and place it on a tripod to the following height inside the hearing loop, dependant on the position of end users: •...
  • Page 20 Step 3: Field Uniformity Set up the FSM on a tripod to the following height inside the hearing loop, dependant on the position of end users: • 1.2 metres (3.9 feet) for seated user. • 1.7 metres (5.6 feet) for standing users. 2.
  • Page 21: Suitable Cable Lengths

    The tables in this section show the approximate maximum cable lengths for differing maximum required currents. Loop impedance (at 1.6kHz) should be less than: Voltage capability of the driver (V7: 7.5, V12a: 12) divided by the required current. This achieves 400mA/m field strength at 1kHz.
  • Page 22 469ft 455ft (equivalent) Example of finding suitable cable length (using V12a): A loop requiring 110m of cable needs 3A at 1kHz to achieve the required field strength. If there are two cables in stock 0.5mm round and 1.5mm round, by looking at the above table we can see that the maximum length at 3A for the 0.5mm cable is 68m.
  • Page 23: Troubleshooting

    1) Reduce the length of the is lit. too long. loop. 2) Use a larger diameter cable. 3) Create a two-turn loop. 4) Use a higher voltage driver. Please contact your distributor (or Contacta if appropriate) if you are experiencing technical difficulties with the product.
  • Page 24: Technical Specifications

    Technical Specification Power 2.1mm 30W 14Vdc 2.14A via External PSU (PS-55) Class 6 External PSU (100V -240V AC 50Hz-60Hz) Inputs 1 X Line XLR or 3.81mm Euro-block [optimised for -10dBV to 0dBv] 1 X Microphone (12V phantom power via 680Ω) [optimised for levels above -45dBv] Output Characteristics see notes 1 and 2 Output Voltage:...
  • Page 25 Technical Specification V12a: Power 2.1mm 100W 24Vdc 4.17A via External PSU (PS-60) Class 6 External PSU (100V -240V AC 50Hz-60Hz) Inputs 1 X Line XLR or 3.81mm Euro-block [optimised for -10dBV to 0dBv] 1 X Microphone (12V phantom power via 680Ω) [optimised for levels above -45dBv]...
  • Page 26: 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 28 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...

This manual is also suitable for:

V7

Table of Contents