TROUBLESHOOTING
If no sound is being picked up by the hearing aid or induction loop test receiver, first
check that the amplifier’s green Power indicator is lit.
If the Power indicator IS NOT lit:-
Check that the power lead is correctly plugged into the mains supply and the amplifier.
If the power indicator is still not lit, the power lead or the amplifier could be faulty.
Check the amplifier with another power lead. If the problem persists, return the
amplifier to your distributor/supplier for repair.
If the Power indicator IS lit:-
Check that the amplifier’s Limit indicator is lit and that an audio signal is active.
If the Limit indicator IS NOT lit, make sure all microphone and audio connection leads
are correctly plugged in and at least one audio source is active.
Adjust the amplifier’s Limit control until the Limit indicator just flickers.
If there is still no sound being picked up by the hearing aid or induction loop test
receiver, check that the loop cable is not broken or misconnected.
Tip: The loop strength meter WILL NOT illuminate if there is a break in the loop cable
or if it is misconnected.
TECHNICAL SPECIFICATION
Rated supply voltage and current: 12V DC
Rated power consumption: 500mA
Maximum RMS output current: 1A
Maximum peak output current: 2A
Maximum RMS load voltage: 4V
Total harmonic distortion: <0.5%
Max. area of a square loop, or of a rectangular loop of stated aspect ratio in m2: 25m
2
Recommended loop conductor size:
0.5mm
2
@ <15m loop length or 1.0mm2 @ >15m to <30m loop length (inc.tails)
Recommended number of turns: 1
Frequency response –1dB: 120Hz – 16kHz
Frequency response –3dB: 120Hz to 5kHz as per IEC 60118-4
Rated Input voltage: Mic: -60dB, Line: -27dB stereo unbalanced
Rated Input Impedance: Mic: 1k Ohm , Line: 100k Ohm
Signal to noise ratio, A weighted (reference maximum RMS current, maximum gain): -60dB
AGC range (3dB change in output current), reference rated input voltage: 10dB
Control and indicator labels and functions: Power LED, Limit LED, Peak LED, Mic Level
control, Line Level Control, Metal Compensation Control, Drive current control.
Special features: Compact, 12V DC Powered.
Connections: Power - 12VDC 1A, Loop Output - 2 Way Screw Terminal, Line - 3.5mm stereo
jack socket, Microphone - 3.5mm mono jack socket.
Fixings: 2x No.8 Japanned Woodscrew (supplied)
Dimensions (H x W x D): 31mm x 120mm x 60mm (Including controls)
Mass: 220 grams
© 2012. Errors and omissions excepted. The manufacturer of this equipment operates a
policy of continuous improvement and reserves the right to alter product specifications at its
discretion and without prior notice.
Approved document No. DCM0003479 Rev 1 • Page 8 of 8
Summary of Contents for VL1
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