3.4
Range warning
In the case the range limit is reached a high 3-beep tone sequence is audible in the base and in the
standard headset approx. every 5 seconds. When the range limit is exceeded the connection will be
released. After the headsets are back again within the reception area the connection setup will be
effected automatically. Finally a high double-beep tone is audible in the headsets and then a high beep
tone which indicates that the connection setup has been completed.
3.5
Battery warning
If the rechargeable battery has an undervoltage a low 3-beep tone sequence is audible in the headset
approx. every 60 seconds.
4.
End of operation
Switch off (switch position OFF) the headset with the On/Off switch and volume control knob (Fig. 3/b).
This guarantees a longer usage from the rechargeable battery. Recharge the headset battery.
In the case of headsets with ambient sound reception switch off the ambient sound reception with the
rotary knob »ASR« (Fig. 4/b), so that the rechargeable battery does not discharge itself.
5.
Headset with level-limited ambient sound reception
5.1
General
The headset with level-limited ambient sound reception (ASR) (Fig. 4) is used mainly where ambient
sounds, warning signals etc, have to be heard perfectly alongside speech communication.
With ASR, ambient sounds can be received via a second microphone (Fig. 4/a) on the front side of the
right-hand headset muff and can be heard via one ASR speaker each in the right-hand and left-hand
headset muffs. Even when receiving a message the external sound reception is in operation.
In the case of external sound levels of over 85 dB(A) the sound level emitted by the ASR speakers in
the headset muffs to the ear is limited to a maximum of 85 dB(A). The overall noise attenuation of the
headset is, however, limited to passive noise attenuation of the headset muffs.
5.2
Operation
Described below are only the operating control differences relating to external sound reception.
Switch on the ambient sound reception by means of the rotary knob »ASR« (Fig. 4/b) on the rear side
of the right-hand headset muff and adjust by means of this rotary knob the desired volume for the
ambient sound reception. The ambient sound reception is switched off in position »OFF«.
Due to the separate On/Off switch and volume control »ASR« it is possible to use the headset for
ambient sound reception only.
Headsets without separate On/Off switch for the ambient sound reception
Headsets are also available without separate On/Off switch for the ambient sound reception. The
ambient sound reception is switched on and off by the On/Off switch and volume control (Fig. 1/c) for
the device. Then the rotary knob »ASR« (Fig. 4/b) is only used to adjust the volume for the ambient
sound reception.
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