Maico MA 53, Руководство по эксплуатации

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Operating Instructions MA 53
Geba_MA53_e_13a.doc 15 851 430/3 11/11
s MCL (Most Comfortable Level).
The UCL level is described as the level between very loud and loud perception
of the test signal.
Press the receiver selector button

or

longer than 2 seconds. The LCD-
display in the upper row changes from
HL to UL (see picture 14).
Start as described in chapter 4.1 with a
test level of 60 dB
HL
.
Present the tone briefly (max. 1s)
If the signal was recognized by the patient as not uncomfortable increase the
level and proceed as described before.
If the signal was uncomfortable for the patient note the values.
Proceed accordingly with other test frequencies.
For hygienic reasons it is important to clean the ear cushions of the
headphone (see chapter 10).
4.3 Bone Conduction (BC) Testing
Bone conduction, i.e. the transmission of sound waves through the skull
directly to the inner ear conways information about the function of the inner
ear. For a neural hearing loss the values of air conduction (chapter 4.1) and
bone conduction are the same. In this case a hearing loss of the middle ear
can be eliminated.
Place the bone conduction receiver so that the flat, circular side of the
transducer
Y is placed on the mastoid, at the noticeable ledge of the cranial
bone behind the auricle). The other side of the headband is placed in front of
the opposite ear.
Set the receiver selector

or

to BC and the signal selector

or

to TONE.
Perform the test the same way as for air conduction (see 4.1). Enter the
measurements for all frequencies on the form, connect all points with dotted
lines marked on the audiogram form as follows: > = right and < = left
For hygienic reasons it is important to clean the bone conductor (see chapter
10).
Picture 14 MA 53 display for UCL-test left