AUDIOropa PROLOOP LOSplus Mode D'emploi page 22

3.5 Example of a LOS loop measuring 16x19 metres, approx. 300m²
Fig. Example of a LOS loop
3.6 Connecting the induction loops to the master and slave amplifier
• The loop amplifier has to be located outside of the loop.
• Twist the section of cable between the amplifier and the loop (supply to the induction loop) to reduce interfe-
rence. (See picture below)
• Use a suitable measuring instrument (e.g. ohmmeter) to make sure that the loop is not grounded (no defect in
the insulation of the loop system). Typical resistance values for a 1000m² loop lie between 0.5 and 3 ohms.
Since the master loop is longer, it also has a greater resistance.
OUT
LOOP
3.7 Adjusting the amplifiers
In order to adjust a LOS system, you will require a field strength gauge, e.g. the FSMplus (A-4292-0).
1. Before you switch on the amplifier, turn the input regulators IN1, IN2 and the loop current controls CURRENT
as far to the left as possible.
2. Plug in the power cord supplied with the amplifier and switch the amplifier on. The power supply indicator (3)
blinks for 10 seconds and should light up than.
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• Connect the cable ends of the loop to the corresponding terminals (17)
COM
on the rear panel of the amplifier. Make sure that you do not mix up the
ends of the master and the slave cable.