2-2 Operation
Front Panel SetupSet 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 SPL 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