36 Maintenance and service
6.2 Daily function check
Visual check
1. Visually check the following condition of the device:
□
All the operating controls are smooth running, nothing is bent or overtorqued,
plug, power supply and accessory cables are not damaged; there are no signs of
ageing.
□
The headphone ear cushions have no cracks, breaks or any signs of ageing.
Replace if necessary.
□
The serial number of the device (SN) is indicated on the headphones and bone
vibrator:
SN headphone:
__________________________
SN bone vibrator: __________________________
SN audiometer:
__________________________
If the serial number on the transducer does not correspond to the serial number
on the audiometer then you cannot use the transducer with that audiometer!
2. Switch on the device.
3. Wait for at least 5 minutes. The device must warm-up.
Checking tone audiometry
4. Check subjectively the hearing threshold via air conduction and bone conduction.
□
The hearing threshold is within normal limits.
5.
Test the following conditions of the air conduction and bone conduction:
□
No disturbing noises, no signal from other channels, no difference in the tone
quality when the masking noise is switched on.
□
dB splitter - weakening is ok
□
dB splitter without mechanical and electrical noises
□
Tone switch (mute button) mechanically silent
□
The emitted noise from the audiometer cannot be heard by the test person
6.
Test the following condition at
60 dB HL
air conduction and
40 dB HL
bone conduc-
tion:
□
Proper function on both sides of the headphone / free field speakers and bone
vibrator at all frequencies and settings, distortion-free, no switch noises.
7. Test the patient response button:
□
Patient response button can be pressed, the signal is displayed
Date
Signature