Maico MA 2 Series, Руководство по эксплуатации

Страница: 25 / 39

Operation Manual MA 25/MA 25e
MA 27/MA 27e
8104818 Rev. 4 24 19/10/2017
Ensure that the headphones are positioned correctly: red phone on the right ear, blue
phone on the left ear. Adjust the headband of the headphones so that the earphones are
positioned at the correct height (i.e. the sound output grid exactly facing the ear canal).
Prior to hearing threshold level measurements, the following instructions should be given.
"You will now hear a variety of tones with various loudness levels, raise your
hand, or press the response switch, as soon as you hear the tone in either ear.
“
5.5.1.2 Threshold Determination
The test normally starts at 1000 Hz on the patient's better ear. Select Right / Left ( F2
key). A procedure of
“down 10 dB, up 5 dB”
is typically utilized to establish a threshold
at each frequency.
5.5.1.3
5.5.1.3
5.5.1.3
5.5.1.3
5.5.1.3 Screening
A hearing screening utilizes a Pass or Refer result and is used to determine if further
testing is required as a hearing problem may exist. Patients are typically screened at
a level of
20 dBHL at 500 Hz , 1000 Hz , 2000 Hz , and 4000 Hz in each ear . If a patient
hears all the tones in each ear, the result would be considered a Pass . Failure to hear
any of the tones in either ear would result in a Refer .
NOTE : This is an example of one screening protocol. Each state may have their own
screening protocol. Contact your state health department for guidelines in your area.
5.5.2 Only for MA 25e/MA27e: Auto Threshold (Hughson-Westlake)
In addition to traditional manual testing, the MA 25e/MA 27e incorporates a Hughson-
Westlake patient controlled automatic threshold test complying with ISO 8253. When the test
is completed the results are easily recalled from the internal memory of the MA 25e/MA 27e.
Hughson-Westlake is a procedure used to determine pure tone thresholds. The
MA 25e/MA 27e utilizes this procedure to perform an automatic pure tone test procedure
(air conduction only). Threshold is defined as 2 out of 3 (or 3 out of 5) correct responses
obtained at a certain level in a 10 dB decrease and 5 dB increase procedure.
The test frequencies will start at 1000 Hz and continue through those frequencies
activated within the settings. The device will re-test 1000 Hz before moving to the next
ear or ending the test.
5.6 Tone Setup Menu
To access the Tone Setup menu press F1 and F4 simultaneously for 2-3
seconds. Once in the Menu (Figure 12), the different Setup options are listed and can
be entered using the function keys or the
Frequency Hz dial. See Table 9 and Table
10 for further explanation.