Specifications

Bosch Security Systems | 2007-08 | 9922 141 50672en
Plena Loop Amplifier | Installation and User Instructions | Design and planning en | 15
2.2.3 Expanded quadrature systems
To cover very large areas, create an expanded
quadrature system (refer to figure 2.5 for an example).
Such a system consists of:
• A master loop amplifier (M) with one or more
induction loops. All master induction loops must
have the same size.
• An odd number of slave amplifiers (S1, S2, S3, etc.)
with one or more induction loops. All slave
induction loops must have the same size.
2.2.4 Low-spill system
A special type of quadrature system is the low-spill
system (refer to figure 2.6 for an example). A low-spill
system makes sure that the magnetic field strength drops
even more rapid to zero beyond the borders of the
covered area. Such a system consists of:
• A master loop amplifier (M) with one or more
induction loops. All master induction loops must
have the same size.
• An odd number of slave amplifiers (S1 in this
example) with one or more induction loops. All slave
induction loops must have the same size.
• Two slave amplifier (S2 and S3 in this example) with
one induction loop. The width of the induction loops
must be between 50 and 66% of the width of the
master induction loops.
Note
Although it is not required, the sizes of the
master and slave induction loops are typically
the same.
figure 2.5: Expanded system (example)
S2
S3
0°
90°
0°
90°
M
S1
figure 2.6: Low-spill system (example)
0°
90°
0°
90°
50-66%W
W
W
50-66%W
S2
S3
M
S1