Calibration of the Device
The instrument, headphones, bone conductor oscillator, as well as the
optional insert phone and loudspeaker match one another and have the same
serial number (e.g. MA1234567). 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 one of the acoustic transducers is
replaced, the instrument must be recalibrated with the new transducer.
The use of non-calibrated audiometers can lead to incorrect measurements!
Where to Setup
The MA 42 should be operated in a quiet room, so that the audiometric
examinations are not influenced by outside noises. Ambient sound pressure
levels in an audiometry 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 the use of these instruments is not allowed in close
proximity to the audiometer.
The test room must be at normal temperature, usually 15° C / 59° F to 35° C
/ 95° F, and the instrument should be switched on about 10 minutes before
the first measurement to guarantee precise measuring results. If the device
has been cooled down (e.g. during transport), please wait until it has warmed
up to room temperature.
External devices such as a computer, printer or
Ethernet which are connected to the device must meet
electrical safety requirements, such as IEC 60601-1 or
UL 60601-1. This is to avoid electrical shock to the user
or the patient. See chapter 0 for more information
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