Ampetronic d series, Installation And User Manual

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Ampetronic D Series Installation Handbook & User Guide Page 5
d . Connect the signal inputs appropriately:
Microphones: Suitable dynamic or condenser microphone with balanced cable feed . Select
phantom power as required . Connect to INPUT 1 and INPUT 2 (with selector switches in the
appropriate position) using a 3-pole XLR plug wired as per Connections drawing.
Line level signals: From other audio equipment such as PA system, mixing desk or CD player .
Connect to INPUT 1 and INPUT 2 (with selector switches in the appropriate position) using a
3-pole XLR plug wired as per Connections drawing. You may use either or both inputs.
Do not run input and output cables close together
e . Connect AC power. See points 6 and 7 in SAFETY section.
N.B. Do not switch the unit on until the loop outputs and signal inputs have been
properly connected.
Tools and Equipment
Small hand tools including a wire stripper, small flat blade and posi screwdrivers will be required.
A magnetic field strength meter, Loopworks Measure App & R1 Reciever, or at minimum an
induction loop receiver is vital to check that the loop system is providing the desired level of
performance .
A pair of headphones with a 3 .5mm jack plug connection is also useful to monitor the loop signal .
System Requirements
The induction loop cables should be already installed according to the ‘Designing Induction Loops’
handbook, or as per specific design instructions provided by Ampetronic. As a result, a target
current should be known, based on achieving acceptable field strength across the area to be
covered .
In order to achieve correct operation it is recommended the loop and feed resistance should be
between 0.2 and 10Ω (at DC). Values outside this may cause the Error LED to illuminate at start
up and the drivers output to be disabled or derated. Loop and feed impedance (at 1.6KHz) should
be less than the voltage capability of the driver divided by the target current required to achieve
field strength. Values above this figure may cause the CLIP LED to illuminate. See troubleshooting
section for advice on how to correct this and get your system working .
The ‘Designing Induction Loops’ handbook contains more details on loop and feed cables . The
correct design and positioning of the actual loop is vital for satisfactory system performance . If in
doubt consult Ampetronic for advice .
Screen
- (Signal cold)
+ (Signal hot)
Connection of balanced
male XLR
1-
1+
2+
2-
1-
1+
2+
2-
LOOP
1-
2-
1+
2+