Circa Enterprises Guardian Telecom PPA, Руководство по установке и эксплуатации

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Guardian Telecom Installation and Operation
Models PTR, PTA, PPR & PPA
Page 13
Ambient Noise Level Adjustment
The Ambient Noise Sensor on Guardian's Page/Talk stations automatically
adjusts the volume of the associated loudspeaker up to 10dB, so that pages
can be heard over the background noise.
There are two controls on the circuit board to adjust the Ambient Noise
Sensor mechanism. The Paging Speaker Volume Control – which is
accessible either from the faceplate or from the back of the module – sets
the volume of the speaker to a comfortable level when the ambient noise is
at a minimum. The Ambient Noise Monitor Adjustment Control determines
how the speaker volume tracks the ambient noise. That is if the speaker is
not loud enough with a high ambient noise the control can be adjusted to
increase the volume. Alternatively if the speaker is too loud with a high
ambient noise the control can be adjusted to decrease the volume. It is
usually not necessary to change the setting of the Ambient Noise Monitor
Adjustment Control since it is set at the factory for average conditions.
Adjustment could be necessary if for some reason the Ambient Noise Sensor
Microphone is shielded from the source of ambient noise or some similar
situation exists.
See: Figure 10 -
Adjustments