Otoport OAE+ABR
User Manual for Otoport DP+TE model
85
ABR test procedure
10.1
Impedance check
The Otoport checks the quality of the connection between the skin and
each of the three electrodes. This takes 2-3 seconds. A low impedance
provides a good connection. Achieving optimum electrode impedance
requires practice and experience.
The Otoport also checks the noise levels, marked TN and PN on the
screen.
Good test conditions are necessary for efficient testing. Test conditions
depend on electrode impedance and noise levels. The Otoport
automatically decides if the test conditions are good, moderately good or
poor:
If test conditions are good
The ABR test will start automatically if the electrode impedances are good
and the electrical noise (EEG) is low for a few moments.
If test conditions are moderately good
If test conditions are moderately good they are satisfactory for testing,
but could be improved; the test will not start automatically. You have two
alternatives: you may manually begin the test by selecting
Start
; or try to
improve the test conditions (for example by reapplying the electrodes or by
settling the baby or by reducing the noise).
Observe the symbols next to each electrode on the screen. Green circles
indicate the quality of the electrode connection. The more the green circle
is filled the better the connection.
If you refit any electrodes then you must select
Check
to re-measure the
impedances.