4. After the power-up test has been completed, the audiometer will
automatically access User Test 1. Proceed with this preprogrammed
test or press
MENU
to access any other User Test or press
MENU
again
to access the Select Function Menu and set up your own test as
described in 4. Test Setup.
MENU
Ensure that Bone has been selected as Output. Threshold testing
normally commences at 1000 Hz in the better ear and continues with the
higher frequencies. It is essential that masking be used in bone
conduction tests (refer to 6.4 and 6.5).
Bone Output
Masking Required
5. Place the patient in sound cabin, if available. Ensure that the patient is
facing away from the audiometer.
6. Instruct the patient in usage of Patient Response Handswitch and/or
microphone and fit headphones ensuring that the red phone (right)
covers the ear to be masked. The other earphone is placed on the
temple region to leave the test ear uncovered.
7. Fit the bone conductor to the mastoid arranging the headband so that it
does not come into contact with the headset.
8. Proceed with test (refer to 6.4 to 6.6 for further details).
NOTE
: In cases where the masking intensity required in one ear is very
high and, therefore, it is impossible to make an accurate threshold
measurement for bone conduction in the other ear, an insert phone is
recommended. An insert phone produces less bone conduction than a
normal TDH 39 phone. Please refer to section 6.6 for further details.
Insert Phone
5.2.3 FREE-FIELD PURE TONE TESTING
Free-field pure tone audiometry is primarily used when testing children
owing to their dislike of wearing headphones.
1. To perform a threshold test in free field, connect the optional power
amplifiers and loudspeakers to the left and right channel connectors on
the rear panel of the instrument. Set up the loudspeakers in the sound
cabin with the left and right channels facing correctly.
2. Connect the MIDIMATE 622 to the mains.
3. Switch on the instrument by pressing the power switch on the right side
panel.
4. After the power-up test has been completed, the audiometer will
automatically invoke User Test 1. Proceed with a preprogrammed test if
you have one for free field or press
MENU
again to access the Select
Function Menu and set up your own test as described in 4. Test Setup.
Select F.F. for output and then select ear:
(Tone)
Output ? :
Air
Bone
F.F.
Select F.F.
MIDIMATE 622 OPERATION MANUAL
5. Operating in Test Mode
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