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Redback® Q 2012 Field Strength Meter
Typical connection between
the Q 2014 Audio Generator
and the Redback A 4210 and
A 4212 Hearing Loop Ampli ers.
Testing The Background Noise:
Use this mode to determine the db levels of background noise, in and around the area the loop is to be installed. The loop
must be inactive when testing in this mode.
Measure the environmental background electromagnetic noise with the loop system off.
The required figure is -32dB (re 400mA/m), but ideally a preferred figure is -47dB! A level of -22dB is useable but must be
reported.
HEADPHONE SOCKET
The audio from the loop being tested, can be monitored by connecting a set of headphones to the 3.5mm socket on the
end of the Q 2012. The Volume knob will adjust the level to the headphones.
BATTERY CHARGING
The "LOW BATTERY" LED will illuminate when the battery requires recharging.
To recharge the internal battery, connect the supplied USB lead to a 5VDC USB source, and connect the other end to the
charging socket located on the end of the Q 2012. The blue "CHARGING" LED will illuminate when the unit is charging.
When the battery is charged, the unit will stop charging and the LED will turn off. The charger can then be unplugged. The
inbuilt charging circuit is a slow charger and may take up to 12 hours to charge a completely flat battery.
REPLACEMENT PARTS
The Redback® Q 2012 Field Strength Meter is supplied with a charging lead. If replacements or spares are required they are
available from Altronics (www.altronics.com.au). The part number is P 6703 - USB Type A Male to 1.35mm DC Plug lead.
Extract from AS60118.4 (2007)
"Magnetic Field Strength in Audio-Frequency Induction Loops for Hearing Aid Purposes": The rigorous standard for Au-
dio Induction Loop Systems, making Australia internationally compliant in regard to field strength and audio quality for
the hearing impaired. This defines the performance criteria of an induction loop system. The key elements may be
summarised:
•
Field Strength in the specified listening area shall be -20dB re 1A/m average i.e. 100mA/metre long term aver-
age, using a 1kHz sinusoidal input, with a variation of +/-3dB.
•
short term peaks up to 400mAmps/metre (0.125secs integration time)
•
Environmental Magnetic Background noise shall be no higher than -40dB A-weighted (measured with the loop
system off).
•
Frequency Response of the system shall be from 100Hz to 5000Hz. The variation should be no more than +/-
3dB from the value taken at 1kHz.
The international standard is IEC 60118.4 (also known as SN, EN or BS 60118.4)
2
Redback® Proudly Made In Australia
LOOP RESISTANCE (0.2Ω TO 1.7Ω. MAX 2Ω)
CAUTION
!
RISK OF ELECTRIC SHOCK
OPEN BY QUALIFIED
PERSONNEL ONLY
Made in Australia by
Altronic Distributors Pty Ltd
www.altronics.com.au
+24V DC FUSE
240V AC @ 50Hz
A 4210 AMPLIFIER
DIP Switch Options
SW
On
1
Vox enabled
2
Not Used
3
Not Used
4
Phantom Power On
Phantom Power O
L
L
Switches
PHASE
SHIFT
-24V DC FUSE
R
R
–
Ewis
Aux
(When Internal
module tted.)
OUTPUT
Single RCA to Dual RCA lead
(such as Altronics P 6280A)
ON/OFF
Low
High
Level
Level
Outputs
Q 2014
Audio Generator
Model : Q 2014
Fig 1
O
Vox disabled
DIP
Vox
Sens.
2
1
2
1
3
3
ON
1 2 3 4
Line
Mic
www.redbackaudio.com.au
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