otometrics Madsen AccuScreen PRO, Руководство пользователя, Страница: 51 / 98

GN Otometrics A/S 51
AccuScreen PRO User Manual Tests
A
Artifact rate (emanating from noise) should be below
20%, if possible
S
Stimulus stability (emanating from probe stability)
should be above 80%, if possible.
6.2.2 DPOAE tests
The LED flashes green during the test.
If the LED is red, this indicates an error during testing:
• The probe is unstable, or
• Artifacts are present, indicating high environmental noise or a
noisy baby.
In these cases, check the test conditions and make sure that the probe
fits.
If the probe does not fit correctly, the screen displays the word LEAK .
Check the probe.
The displayed DPOAE graph
The response or lack of response is shown in the probability circle
during testing.
A response is always in constant phase compared to the stimuli.
When a response is registered, it is mapped from the center towards
the outer edge of the probability circle, forming a more or less
straight line. A
PASS is determined with a confidence of 99.7% for
each frequency.
Noise (= no response) is randomly distributed in the circle and will
reach the outer edge only with a 0.3% probsbility.
If mapping is randomly distributed, the test is heading towards a
REFER . Check the probe fit and the test environment, and make sure
that the patient is calm.
If required, press
STOP
to stop the test.
Tests with a Stopped result are not saved. Accordingly, they cannot be
retrieved in the
View results
screens and they cannot be printed
out.
If the message CalFail appears, refit the probe and make sure that it
fits correctly. Restart the test.