Plena Loop Amplifier | Installation and User Instructions | Configuration
Slave induction loops
Do as follows:
11 Disconnect the master induction loops from the
master loop amplifier.
12 Connect the slave loop amplifier to the mains power
supply with a power cable.
13 Set the AGC/Limiter switch on the rear of the slave
loop amplifier in the Limiter position.
14 Switch on the master loop amplifier with the power
switch on the front of the master loop amplifier.
15 Switch on the slave loop amplifier with the power
switch on the front of the slave loop amplifier. When
the induction loop system contains more than one
slave loop amplifier, make sure that all other slave
loop amplifiers are off.
16 Increase the volume of audio input 2 of the slave
loop amplifier with its volume control until the
Limiter LED on the front of the slave loop amplifier
17 Increase the electric current through the slave
induction loops with the Master volume control on
the front of the slave loop amplifier until the
magnetic field strength in each slave induction loop
is 100 mA/m (pink noise source) or 70 mA/m (sine
wave of 1 kHz).
18 Switch off the slave loop amplifier with the power
switch on the front of the slave loop amplifier.
19 Repeat the procedure for the other slave loop
amplifier in the induction loop system.
Do not forget to re-connect all induction loops
after you have configured the electric current
through the induction loop of the last loop
Bosch Security Systems | 2005-05 | 9922 141 50672en
You can cover the front of the loop amplifier with a
bracket refer to figure 5.2). When you cover the front,
you make sure that nobody can change the position of
the volume controls. Thus, you make sure that nobody
can change the electric current through the induction
loop that is connected to the loop amplifier.
-2 0 dB
figure 5.2: Cover bracket
Metal loss compensation
Do as follows:
1 Turn the Metal loss compensation control on the
rear of the loop amplifier to the leftmost position.
2 Connect headphones to the headphones socket on
the front of the loop amplifier to listen to the audio
signal that is sent to the connected induction loops.
3 With the same headphones, listen to the audio signal
on the induction loops through an induction loop
4 Turn the Metal loss compensation control to adjust
the tone of the audio signal on the induction loops.
5 Repeat the procedure for the other loop amplifiers in
the induction loop system.
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