Testing Patients With Large Threshold Differences - otometrics Madsen Midimate 602 Quick Manual

MIDIMATE 602 & 622 Diagnostic Audiometers
6. Fit the headphones on the patient, with the red phone on the right ear.
7. If required, test the level of the operator's monitor or talkover microphone on the
patient. If needed, adjust by pressing and holding down the Microphone key in
the left-hand Level section of the front panel, or the Talk Over key and turning
any of the rotary wheels. The Stimulus indicator shows the percentage used.
8. Toggle Shift L/R to select the ear with the better hearing to be tested first. The ear
selected for testing is shown on the display above Softkey 3.
9. Turn the Frequency wheel to set the stimulus frequency shown on the display
above Softkey 1. Testing normally starts at 1000 Hz.
10. Toggle Softkey 2 to P if pulsed tone is required.
11. To present the stimulus tone to the patient's test ear, press the Tone Switch,
which is the large key below the Hearing Level wheel. The Stimulus indicator
lights to confirm that the tone is presented and displays the intensity as long as
the Tone Switch is held down.
12. Turn the Hearing Level wheel to change the stimulus intensity until the patient's
threshold is found for the current frequency (displayed above Softkey 1), and
read its value from the display above Softkey 3.
13. If Store is set up, press Softkey 3 twice to store this value (MIDIMATE 622
only).
14. Repeat the test at the next frequency. Testing is usually done at increasing fre-
quencies until the highest frequency is reached, and then to test at the frequencies
below 1000 Hz in descending order.
15. Repeat the test for the poorer ear.
4.1.3

Testing patients with large threshold differences

If the difference between the thresholds in the two ears is greater than 40 to 60 dB, do
as follows:
1. Press Menu to display the Select Function menu.
2. Press Softkey 2 to select Air, which presents Narrow Band Noise (masking) to
the better (contralateral) ear.
3. Use Softkey 4 to toggle masking On.
4. Turn the Masking Level wheel to set the masking level shown on the display
above Softkey 5.
5. Cooperate with the patient to determine the threshold for Narrow Band Noise for
the contralateral ear.
6. Set Masking to a level 15 dB above this threshold.
7. Continue to apply masking to the better ear. Present a tone to the poorer ear at
the hearing level that was previously determined to be the tone threshold with-
out masking.
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