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Operation
Front Panel Setup
Set up the FM-15 ALC as follows:
1.Set the
MANUAL LEVEL CONTROL
to automatic (Blue
Knob) (see
Figure 2-1). This allows the FM-15 ALC to calibrate itself.The automatic
position will allow the FM-15 ALC to constantly change the paging level
to compensate for the changes in noise level in the area being
monitored.
2.Check the
SP
L meter (the Green LED) (see Figure 2-1) for maximum
noise level. This is your high noise level reading.
3.Set the
MAXIMUM NOISE
LEVEL
control (Red Knob) (see Figure 2-1)
to the average high noise level. If you feel the room noise may actually
be louder at some time, move the control up one click to the right
(clockwise).
4.The
PAGING LEVEL
meter (the Red LED paragraph) (see Figure 2-1)
indicates the paging level changes that are taking place with dual
LEDS.
5.Calibration is complete.
Figure 2-1. FM-15 ALC
100dB
90dB
80dB
70dB
60dB
105dB
95dB
85dB
75dB
65dB
Full Volume
-6 dB
-12 dB
-18 dB
-24 dB
Noise Level
dB SPL
Paging Level
dB
-18 dB
-24 dB
-12 dB
-6 dB
Manual Level Control
95dB
90dB
100dB
105dB
Set Maximum Noise Level
85dB
SPL meter
[Green LED]
Paging Level
[Red LED]
Maximum Noise
[Red Knob]
Manual Level Control
[Blue Knob]
Automatic Level
Control
Telephone Input
Active