contacta V22 Series Hearing Loop Driver User Guide

V22 Series Hearing Loop Driver

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Specifications

• Product: V22 Hearing Loop Driver
• Power Supply: Varies by country
• Max. Output Voltage: 22V
• Max. Current: 12A
• Loop Impedance: Less than the voltage capability of the driver
  divided by the required current

Product Overview

For large area hearing loop installation instructions, consult
the Large Area Hearing Loop Installation Guide.

Components

• Rubber Feet x 4
• 2-way 3.5mm Euro-Block Connector x 2
• 3-way 3.5mm Euro-Block Connectors x 3
• 4-way Terminal Block
• Hearing Loop Stickers
• V22 Hearing Loop Driver
• User Guide
• IEC Power Lead* (Plug type varies by country)
• Rack Mounting Ears
• Compliance Certificate

Connections

1. Power Supply Input* (see page 6)
2. Factory Use (no user input)

Suitable Cable Lengths

The tables below show the approximate maximum cable lengths for
differing maximum required currents to achieve a 400mA/m field
strength.

V22 Single-Turn (Metric)

V22 Single-Turn (Imperial)

Current| Impedance| Cable Type| Cable Length| Max. Cable Length Round Cable (AWG)
---|---|---|---|---

V22 Double-Turn Hearing Loop (Metric)

FAQ

Q: Can I use any type of microphone or sound system with the

V22 Hearing Loop Driver?

A: Yes, the V22 Hearing Loop Driver can work with various types
of microphones and sound systems as long as they are compatible
with the driver’s specifications.

Q: What should I do if I encounter warning or error messages

while using the V22 Hearing Loop Driver?

A: If you encounter any warning or error messages, refer to the
Troubleshooting section of the user manual for guidance on
resolving issues.

Q: How often should I check the loop impedance for optimal

performance?

A: It is recommended to periodically check the loop impedance to
ensure optimal performance, especially when changes are made to the
audio setup or equipment connected to the driver.

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V22
Hearing Loop Driver
Installation & User Guide
August 2022
1

Contents
Product Overview Components Connections Suitable Cable Lengths Driver Area Coverage Controls Hearing Loop Setup Troubleshooting Warning / Error Messages Technical Specifications Standards

3 4 5-7 8-9 10 11-19 20-25 26 27-29 30 31

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.
2

Product Overview
Our highly efficient V22 hearing loop driver is built around high-end technology designed for the flagship V Series PRO hearing loop driver range. It is suitable for driving the most demanding perimeter loop systems in medium to large venues. With a Class-D amplifier output stage, the V22 delivers a high enough current to drive even the toughest loop loads. The audio subsystem is built around an advanced DSP core. Combined with a microprocessor control that ensures peak performance, the driver uses cutting edge technology to deliver peak performance.
Note: For large area hearing loop installation instructions, consult the Large Area Hearing Loop Installation Guide.
3

2 1
3

Components

6

8

4

45

7

9 8

7

10

1. Rubber Feet x 4 2. 2-way 3.5mm Euro-Block Connector x 2 3. 3-way 3.5mm Euro-Block Connectors x3 4. 4-way Terminal Block 5. Hearing Loop Stickers 6. V22 Hearing Loop Driver 7. User Guide 8. IEC Power Lead* 9. Rack Mounting Ears 10. Compliance Certificate

*Plug type varies by country.
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. 4

Connections

1

2

3

45

6
1. 2. 3. 4.
5.
6.
7. 8.

7

8

Power Supply Input* (see page 6)
Factory Use (no user input)
Line Input ­ 3.5mm Euro-block balanced line input
100V Line Input ­ 3.5mm Euro-block transformer isolated & balanced
MP3 (Line Level Input) ­ 3.5mm Euro-block transformer isolated & balanced
Line/Microphone ­ 3.5mm Euro-block – switchable phantom power (12V)
Line Output ­ 3.5mm Euro-block** (see page 6)
Loop Output ­ 5.08mm 4-way terminal block

5

*Power Sources – This product should be operated only from the type of power source indicated on the marking label. If you are not sure of the type of power supply to your home, consult your product dealer or local power company. The primary method of isolating the amplifier from the mains supply is to disconnect the mains plug. Ensure that the mains plug remains accessible at all times. Unplug the AC power cord from the AC outlet if the unit will not be used for several months or more. **Line Output – The Line Output on the V22 allows further V22s to be “chained” from the first V22. It will feed the Line Input [3] on the next V22 and is a simple mix of the two inputs to which the driver time delay (see page 18), if used, has been applied. This means that the time delays of a chain of V22s is cumulative and may be adjusted to suit large auditoriums. The Line Output is not processed by the V22’s Automatic Gain Control (see page 14). The AGC, if used, is only applied to the Loop Output [8]. This prevents the drivers’ Line Outputs from cascading multiple AGC stages down the chain. It is therefore important to set the input gain on each V22 in the chain to maintain the level in the chain. The Line Output is not phased and cannot be used to create phased pairs of V22s.
6

Connection Examples
Balanced Inputs
MP3 Connections
7

Suitable Cable Lengths
The tables in this section show the approximate maximum cable lengths for differing maximum required currents to achieve a 400mA/m field strength.
Loop impedance (at 1.6kHz) should be less than voltage capability of the driver (22V) divided by the required current.
The minimum loop resistance (DCR) is 0.25.
V22 Single-Turn (Metric)

Current Impedance

1A 22.6

2A 11.3

3A

4A

5A

6A

7A

8A

9A

10A

11A

12A

7.53 5.65 4.52 3.77 3.23 2.83 2.51 2.26 2.05 1.88

Cable Type

Cable Length

Max. Round Cable Cable
Length (AWG)

1.5mm 970.99m 485.50m 323.66m 242.75m 194.20m 161.83m 138.71m 121.37m 107.89m 97.10m 88.27m 80.92m 2.5mm 1091.74m 545.87m 363.91m 272.94m 218.35m 181.96m 155.96m 136.47m 121.30m 109.17m 99.25m 90.98m

Flat Cable 10mm (Width)
12.5mm

614.41m 1161.97m

307.21m 204.80m 153.60m 122.88m 102.40m 87.77m 76.80m 68.27m 61.44m 55.86m 51.20m 580.99m 387.32m 290.49m 232.39m 193.66m 166.00m 145.25m 129.11m 116.20m 105.63m 96.83m

25mm 1538.27m 769.13m 512.76m 384.57m 307.65m 256.38m 219.75m 192.28m 170.92m 153.83m 139.84m 128.19m

V22 Single-Turn (Imperial)

Current Impedance

1A 22.6

2A 11.3

3A

4A

5A

6A

7A

8A

9A

10A

11A

12A

7.53 5.65 4.52 3.77 3.23 2.83 2.51 2.26 2.05 1.88

Cable Type

Cable Length

Max. Cable
Length

Round Cable
(AWG)

18AWG 2552.86ft 1276.43ft 850.95ft 638.21ft 510.57ft 425.48ft 364.69ft 319.11ft 283.65ft 255.29ft 232.08ft 212.74ft 14AWG 3408.47ft 1704.23ft 1136.16ft 852.12ft 681.69ft 568.08ft 486.92ft 426.06ft 378.72ft 340.85ft 309.86ft 284.04ft

Flat Cable (Width)

18AWG (equiv.)
14AWG (equiv.)

2871.76ft 1435.88ft 957.25ft 717.94ft 574.35ft 478.63ft 410.25ft 358.97ft 319.08ft 287.18ft 261.07ft 239.31ft 4538.17ft 2269.08ft 1512.72ft 1134.54ft 907.63ft 756.36ft 648.31ft 567.27ft 504.24ft 453.82ft 412.56ft 378.18ft

8

V22 Double-Turn Hearing Loop (Metric)

Current Impedance

1A 22.6

2A 11.3

3A

4A

5A

6A

7A

8A

9A

10A

11A

12A

7.53 5.65 4.52 3.77 3.23 2.83 2.51 2.26 2.05 1.88

Cable Type

Cable Length

Max. Round Cable Cable
Length (AWG)

1.5mm 650.61m 325.31m 216.87m 162.65m 130.12m 108.44m 92.94m 81.33m 72.29m 65.06m 59.15m 54.22m 2.5mm 683.46m 341.73m 227.82m 170.87m 136.69m 113.91m 97.64m 85.43m 75.94m 68.35m 62.13m 56.96m

Flat Cable 10mm (Width)
12.5mm

537.58m 831.19m

268.79m 179.19m 134.39m 107.52m 89.60m 76.80m 67.20m 59.73m 53.76m 48.87m 44.80m 415.60m 277.06m 207.80m 166.24m 138.53m 118.74m 103.90m 92.35m 83.12m 75.56m 69.27m

25mm 984.36m 492.18m 328.12m 246.09m 196.87m 164.06m 140.62m 123.05m 109.37m 98.44m 89.49m 82.03m

V22 Double-Turn Hearing Loop (Imperial)

Current Impedance

1A

2A

22.6 11.3

3A

4A

5A

6A

7A

8A

9A

10A

11A

12A

7.53 5.65 4.52 3.77 3.23 2.83 2.51 2.26 2.05 1.88

Cable Type

Cable Length

Max. Cable
Length

Round Cable
(AWG)

18AWG 1864.96ft 932.48ft 621.65ft 466.24ft 372.99ft 310.83ft 266.42ft 233.12ft 207.22ft 186.50ft 169.54ft 155.41ft 14AWG 2131.29ft 1065.65ft 710.43ft 532.82ft 426.26ft 355.22ft 304.47ft 266.41ft 236.81ft 213.13ft 193.75ft 177.61ft

Flat Cable (Width)

18AWG (equiv.)
14AWG (equiv.)

2254.91ft 1127.45ft 751.64ft 563.73ft 450.98ft 375.82ft 322.13ft 281.86ft 2958.49ft 1479.24ft 986.16ft 739.62ft 591.70ft 493.08ft 422.64ft 369.81ft

250.55ft 225.49ft 204.99ft 187.91ft 328.72ft 295.85ft 268.95ft 246.54ft

9

Driver Area Coverage
Note: A full site survey of an installation area is recommended for optimal loop design.
Areas detailed in the table below are valid only when the following conditions are met:
1. Area is at the maximum current the driver is capable of delivering without voltage clipping at 1.6KHz
2. Loop layout is designed to achieve 0dB in the centre 3. 25mm x 0.1mm flat copper cable 4. Loop is installed in the floor 5. Listening height 1.2m (large perimeter loops may have areas where
the actual signal level is higher than required)

Voltage Current

22V

12A

1:1
715.0sqm 7692.0sqft

Area 1:2
899.0sqm 9672.0sqft

1:3
961.0sqm 10338.0sqft

10

Controls
Front Panel Overview

1

23

4

1. Clip Status Light – When lit, this status LED indicates the signal on the hearing loop output is clipping (see Troubleshooting on page
26 for appropriate solutions). 2. Open Circuit Loop – Indicates the status of the Loop integrity 3. Display Screen – Indicates the status of the Loop Output, displays
menu and adjustment options. 4. Control Dial – Used for unlocking and making adjustments.

Start-Up Sequence
When power is applied the hearing loop driver will automatically perform an analysis of the loop connected to the output.
When the analysis is complete, the following screen should display:

Rotating or pressing the control will display the unlock screen.
Should an error occur during start up, please consult warning and error messages page 26.

11

Locking/Unlocking the Hearing Loop Driver
The hearing loop driver will power up in Output Current Display Mode and will be locked from entering Adjustment Mode.
Unlock the Driver
1. To unlock the hearing loop driver, press the control dial, and when prompted “Unlock driver?” click “Yes.”
2. Enter the passcode 2239: a. Rotate the control clockwise to select the first required digit. b. Press the control dial in to select the digit. c. Repeat steps (a) and (b) until all the digits have been selected.
Note: Entering the wrong code returns the driver to the lock screen.
Modes
Main Menu
After being unlocked, the hearing loop driver will display the main menu. This is indicated by up and down arrows on the display screen.
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:
1. Loop Output 2. Loop Drive Set 3. AGC On/Off 4. Input A Level 5. Input B Level 6. Phantom Power Input B 12

7. High-Frequency Compensation 8. Input High Pass Filter 9. Acoustic Delay 10. Backlight Timeout 11. Diagnostics 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.
If the control dial is not used for 120 seconds when in Adjustment Mode the hearing loop driver will revert to the main menu, with Loop Output as the default screen. Locking/Rebooting the Unit To lock the V22 when not in adjustment mode, press and hold the control dial for 5 seconds.
If an error message is displayed, reboot the driver by pressing and holding the control dial for 5 seconds.
Loop Output
The hearing loop driver’s Loop Output section displays the real-time output current, both graphically in 1A steps and numerically in 0.1A steps.
13

Loop Drive Set
The hearing loop driver’s Loop Drive Set section displays the real-time output current in 1A steps. Adjustments
In Adjustment Mode, the real-time current is displayed on the top line in 1A steps. The bottom line indicates the strength of the loop output level adjustment. · To increase the loop output level, rotate the control dial clockwise. · To decrease the loop output level, rotate the control dial
anti-clockwise. · Press the control dial once to confirm the selection and return to
the Loop Drive Set menu.
AGC On/Off
The AGC function can be switched on or off from this screen. For normal set-up and operation and optimal performance it is recommended the AGC is left on. Adjustments
Rotating the control dial clockwise or anti-clockwise in Adjustment Mode will toggle the AGC on or off. Press the control dial once to confirm the selection and return to the main menu.
14

Input A Level
Input A/Isolated can be adjusted over 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. · “Good” indicates the level is at an optimum level for the automatic
gain control to operate. · “High” indicates the level is too high and signal clipping may occur.
Signal clipping will also be shown by the LED
Adjustments Enter Adjustment Mode and alter the level displayed on the bar until the text displays `Good’. It is recommended that at least 5 blocks in the adjustment block are filled. · To increase the input level, rotate the control dial clockwise. · To decrease the input level, rotate the control dial anti-clockwise. · Press the control dial once to confirm the selection and return to
the main menu.
Input B Level
Input B can be used for either line level or microphone level signals and can be adjusted over a range of 47dB. The top line of the display indicates if the correct microphone input level has been achieved: · “Low” indicates the level is too low for the automatic gain control
to operate. · “Good” indicates the level is at an optimum level for the automatic
gain control to operate. 15

· “High” indicates the level is too high and signal clipping may occur. Signal clipping will also be shown by the LED.
Adjustments Enter Adjustment Mode and alter input level displayed on the bar until the text displays `Good’. It is recommended that at least 5 blocks in the adjustment block are filled. · To increase the input level, rotate the control dial clockwise. · To decrease the input level, rotate the control dial anti-clockwise. · Press the control dial once to confirm the selection and return to
the main menu.
Phantom Power Input B
Phantom power for a connected microphone is set off as the default setting. If required by the connected microphone, enable phantom power.
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.
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: · To increase the high-frequency compensation level, rotate the
control dial clockwise. · To decrease the high-frequency compensation level, rotate the
control dial anti-clockwise. · Press the control dial once to confirm the selection and return to
the main menu.
Input High Pass Filter
This feature removes low-frequency sounds from the hearing loop when background noise such as air conditioners might impact users. Select either 150Hz or 180Hz if required.
17

Adjustments Rotating the control dial clockwise or anti-clockwise in Adjustment Mode to toggle between the 150Hz and 180Hz cut-off or turn the filter off. Press the to dial once to confirm the selection and return to the main menu.
Acoustic Delay
In theatres, stadiums, and other large venues, sound sent from speakers will be impacted by the speed of sound, whereas audio sent through a hearing loop will reach a user instantly. This means the two sounds must be aligned or users will hear a constant echo. Adjustments Alter syncing and compensate for latency. · To increase the delay, rotate the control dial clockwise. · To decrease the delay, rotate the control dial anti-clockwise. · Press the control dial once to confirm the selection and return to
the main menu.
Backlight Timeout
Rotating the control dial clockwise or anti-clockwise in Adjustment Mode will toggle the screen’s backlight on or off. Press the control dial once to confirm the selection.
18

Diagnostics
This screen displays the connected loop’s resistance (R ohms) and loop Inductance (L uH). Rotating the control dial clockwise displays the internal heatsink temperature and fan PWM (100% is fan full speed): Rotating the control dial clockwise again displays the internal power supply voltages: Rotating the control dial clockwise again displays the UID unique identification for the driver.
19

Hearing Loop Setup
Warning: Ensure the AGC setting is on before proceeding. To ensure optimal performance, setup should be performed in following order: Step 1: Background Noise Level (see page 21) Step 2: Metal Loss (see pages 21-22) Step 3: Output Level and Clipping (see page 22-23) Step 4: Field Uniformity (see page 23-24) Step 5: Final Output Level Adjustment (see page 25) Step 6: Input Signal Level Adjustment (see page 25)
Required for Setup
· TSG – Contacta Test Signal Generator (TSG1) · FSM – Contacta Field Strength Meter (IL-CONTACTA-FSM) · Tripod or similar for mounting the FSM is recommended · `Compliance Certificate’ document Note:
Throughout 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.
20

Step 1: Background Noise Level

This test should be performed prior to loop installation.

1. 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. · 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”.

Measure and note the background noise level throughout the

looped area on the Compliance Certificate document.

5. Listen to the loop through the FSM (A-weighted) or a loop listener (A-weighted). Note and demonstrate any interference to the customer which may not be heard through a hearing instrument.

6. Background magnetic noise should ideally be between -32dB and -60dB. If the readings noted pass the Compliance Certificate document’s requirements, move on to Step 2: Metal Loss.

Step 2: Metal Loss

1. 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. · 1.7 metres (5′ 6″) for standing users.

A tripod or similar for mounting the FSM is recommended. 2. Connect the TSG to the line input of the hearing loop driver.

21

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 “Good” is displayed.

6. Adjust the drive level to achieve 2 amps of output current.

Set the TSG to the pink noise setting and record the value

measured by the FSM.

Set the FSM to the Third Octave F= 100Hz setting and record

the value measured.

Set the FSM to the Third Octave F= 5000Hz setting and

record the value measured.

If the difference between the values measured at 1000Hz and

5000Hz is less than 3dB, record the results and move on to

Step 3: Output Level and Clipping. If the difference is higher than

3dB, move on to step 11.

11. Increase the HF comp and repeat steps 3 to 10.

Step 3: Output Level and Clipping

Note: This test should be performed as briefly as possible.

1. Set the TSG to the 1kHz setting.

2. Set the FSM to the RMS/Peak A-Weighted mode.

3. Adjust the drive level to achieve 2 amps of output current.

4. Measure the field strength. Achieve 0dB by using the FSM’s indicated field strength to work out the extra current required. For example: if the measured field strength on the FSM is (A-RMS) -6dB then 6dB (2X) extra current will be required to achieve 0dB (see Note 1 on page 24).

Note: If more than 15.5dB is required to achieve 0dB, a different

22

loop design or more powerful driver is required. This is potentially due to metal loss.

5. Briefly alter the current to the desired level. For instance, the example in step 4 requires 4 amps of current.
6. The field strength will now be 0dB +/- 1dB.

Quickly record the current required to achieve 0dB field

strength. Now switch the TSG to 1.6kHz.

8. Confirm that the Clip LED remains unlit.

9. If the driver’s front panel Clip LED remains unlit, return the TSG to 1kHz and reduce output current to 2 amps move on to Step 4: Field Uniformity.

If the driver’s front panel Clip LED is lit, the driver is clipping. This means the loop connected is too long, and therefore:

1. The system is not IEC60118-4 compliant 2. The sound will be distorted 3. The driver may be susceptible to damage and warranty voided
Perform one of the following solutions and repeat until there is no clipping:

1. Reduce the loop current 2. Reduce the length of the loop 3. Use a heavier gauge of cable 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 recommended.

23

2. Reduce the loop output current to 2 amps.

Set the FSM to the RMS/Peak A-Weighted mode and record

the value measured by the FSM in the centre of the loop.

Move the FSM to other positions within the looped area

and record the values measured by the FSM.

5. The differences measured in other positions should not be greater than +/- 3dB of that measured in the first position.

6. Repeat steps 3 to 5 to create a suitable map of the area looped.

Step 5: Final Output Level Adjustment

1. Set the TSG to 1kHz.

2. Adjust the output current to the level recorded in Step 3: Output Level and Clipping (7) on page 22. Once the current is set, disconnect the TSG.

Step 6: Input Signal Level Adjustment

1. Connect the system signal source.

2. Adjust the input level (line/mic) level until “Good” is displayed on audio peaks.

3. The system is now set up.

24

Note 1:
When adjusting the output current, if a level of 6 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:

Measured Field Strength 6.00dB 5.00dB 4.00dB 3.00dB 2.00dB 1.00dB .00dB -1.00dB -2.00dB -3.00dB -4.00dB -5.00dB -6.00dB -7.00dB -8.00dB -9.00dB -10.00dB -11.00dB -12.00dB -13.00dB -14.00dB -15.00dB

Output current that will achieve 0dB 1.00A 1.12A 1.26A 1.42A 1.59A 1.78A 2.00A 2.24A 2.52A 2.83A 3.17A 3.56A 3.99A 4.48A 5.02A 5.64A 6.32A 7.10A 7.96A 8.93A 10.02A 11.25A

25

Troubleshooting

Symptom

Possible Fault

Action

The driver does not turn on. 1) Mains power is absent.

1. Check mains power.

Interference (buzzing/ whistling/hissing) is heard
through induction loop.

2. Internal failure. 1) Bad input signals.

3. Seek assistance.

4. Power off the hearing loop driver and confirm that interference isn’t from external origin.

The driver is excessively hot to touch.

2. Internal failure.

3. Disconnect input signals. If sound disappears, check inputs.

4. Large amount of mains hum 1) Check input signal source. present on input.

5. Internal failure.

The loop output level

1. Shorted feeder cable.

indicates current is flowing

but I hear nothing in the loop.

2. Incorrect hearing loop driver being used.
3. Check feeder cable, although the hearing loop driver will usually refuse to tune to shorted feeder.

The sound is distorted.

2. Loop listener is not working or being used too far from loop.

3. Input level has been turned up too high for signal level at input.

4. Check listener and location. 1) Reduce input level setting.

5. Input signal is distorted.

6. Check signal source.

The Clipping Status Lights are lit.

3. Output signal is clipping.

4. Refer to “The Clipping Status Lights are lit” below.

The connected hearing loop is 1) Reduce the length of the

too long.

loop.

2. Use a larger diameter cable.

3. Create a two-turn loop and reduce the current output.

4. Use a higher voltage driver.
   Please contact your distributor (or Contacta if appropriate) if you are experiencing technical difficulties with the product.

26

Warning / Error Messages
When power is applied, the hearing loop driver will automatically perform an analysis of the loop connected to the output. The following messages indicate an error has been detected: Main PSU Fault This message indicates an error with the main internal power supply.
The mains power should be recycled, or a reboot initiated. If the warning still appears, disconnect the power supply and contact your distributor (or Contacta if appropriate). Aux PSU Fault This message indicates an error with the auxiliary power supply.
The mains power should be recycled or a reboot initiated. If the warning still appears, disconnect the power supply and contact your distributor (or Contacta if appropriate). Loop Open or High Res This message indicates that the loop connected is either open circuit (not connected) or is very high resistance.
The power should be removed, and loop and feeder cables should be checked with an ohmmeter to confirm continuity (too long/small gauge).
27

Impedance Error This message indicates that the loop connected has characteristics that are not expected with typical loops.
The mains power should be removed, or the unit rebooted. Then, check the loop and feeder cables. Contact your distributor (or Contacta if appropriate) if the error persists. Loop Fault This indicates the driver has detected a general fault with the output.
This message can be displayed during start up or during operation. Contact your distributor (or Contacta if appropriate) if the error persists. Loop Open During normal operation, this message indicates that the loop is open circuit; the Open Circuit Loop led on the front panel will also be lit
The mains power should be removed. Then, check the loop and feeder cables. Contact your distributor (or Contacta if appropriate) if the error persists.
28

Loop Short or Low R This indicates the driver has detected that either the loop connected has a very low resistance (<0.25) or there is a short circuit on the output.
This message can be displayed during start up. If displayed, remove the power and check the loop. Low resistance can be caused by a loop that is too short or is using a heavy gauge of cable. There may also be a short between conductors at the end of a feeder cable. Contact your distributor (or Contacta if appropriate) if the error persists.
29

Technical Specification

Power

Voltage: 100V-120V /200V-240V AC (Universal auto switching) Frequency: 50Hz- 60Hz Power: 175W Connection: IEC

Inputs

1 X Input A 3.5mm Euro-block [optimised for -10dBV to 0dBv] 1 X 100V Line Input (Transformer isolated) 3.5mm Euro-block 1 X MP3 Input (Line level, transformer isolated) 3.5mm Euro-block 1 X Input B Line/Microphone (12V phantom power via 680) [optimised for levels above -45dBv to -10dBv] 3.5mm Euro-block

Output Characteristics

Output Voltage: 22Vrms (62.04Vpk-pk) @ 12Arms (33.84Apk-pk) see notes 1 and 2 Output Current: 12Arms (33.84Apk-pk) up to 300 seconds Loop Connector: 4 Way 5.08mm Euro block Induction loop performance compliant with BS EN60118-4 (when correctly installed)

Audio system

Frequency Response: 80Hz to 9kHz Distortion: THD+N <1% (-40dB) AGC: Switchable (Peak detecting) HF Comp: 7 optimised stages
Acoustic Time Delay 10ms to 70ms adjustable in 1ms steps
Low cut filter Selectable 150Hz or 180Hz

Display & Control

Display: LED Backlit LCD display Control: Single rotary control

Fault Monitoring and Protection

Main Display: Open circuit loop (DCR measurement) Loop ground fault Front Panel LED: Output voltage clipping Cooling: Internal heatsinks with thermal protection

Physical

Height: 42mm (1.65″) Depth: 149.9mm (5.9″) Width: 432.9mm (17.04″) Weight: 938g
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Note 1: Z=1.83 (162uH +0.838 @ 1.6kHz), Note 2: < 1% (-40dB) distortion,
Note 3: The minimum loop resistance (DCR) is 0.25

Standards

Directive Number

Directive Title

2014/30/EU 2014/35/EU 2012/19-EU 2011/863/EU

The Electromagnetic Compatibility Directive The Low Voltage Directive The Waste Electrical & Electronic Equipment Directive The Restriction of Hazardous Substances Directive

This product has been designed and tested to comply with the following North American and Canadian standards:

· FCC class “B” EMC (emissions) · ICES-003

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (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.
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 resources, this product should be recycled responsibly. To dispose of your product, please use your local return and collection systems or contact the retailer where the product was purchased.
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Local dealer:

UK & ROW +44 (0) 1732 223900 sales@contacta.co.uk
www.contacta.co.uk

US & Canada +1 616 392 3400 info@contactainc.com
www.contactainc.com

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References

• Innovative assistive technology solutions - Contacta
• Home - Assistive Hearing Technology & Solutions - Contacta Inc

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