Operating Instructions MA 41
8100456_OI_MA41_EN_15a 4 8100456-8 04/15
3.2 Calibration of the Device
The instrument, headphones, bone conduction oscillator, as well as the
optional insert phones and speakers, will come calibrated to the instrument and
have the same serial number (e.g. 0021520). Use of transducers not calibrated
to this particular instrument will likely lead to incorrect thresholds causing
incorrect test results which will invalidate the test. If a transducer needs to be
replaced, the instrument must be recalibrated with the new transducer.
The use of non-calibrated audiometers can lead to incorrect results!
3.3 Where to setup
The MA 41 should be operated in a quiet room, so that the audiometric
examinations are not influenced by outside noises. Ambient sound pressure
levels in an audiometric test room shall not exceed the values specified in the
norm ISO 8253-1:2010 or ANSI S3.1-1999. For use in noisier environments,
headphones with optional sound insulation muffs are available.
Electro-medical instruments, which emit strong electromagnetic fields (e.g.
microwaves or radiotherapy devices), can influence the function of the
audiometer. Therefore, it is not recommended to the use these instruments in
close proximity to the audiometer as it may lead to incorrect test results.
The test room must be at a normal temperature, usually from 15° C / 59° F to
35° C / 95° F, and the instrument should be switched on approximately 10
minutes before the first measurement. If the device has been cooled down (e.g.
during transport), please wait until it has warmed to room temperature before
using.
Caution: External devices such as a computer, printer or Ethernet which are
connected to the device must meet electrical safety requirements, such as
IEC/EN 60601-1 or UL 60601-1. This is to avoid electrical shock to the user or
the patient.
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