Hearing Screening Systems (Technical Manual)
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Press the “Select” button. Just after the test start, the screening system switches to
the impedance measurement mode (Fig. 22).
Fig. 22. The impedance measurement window.
The current values of impedance for the electrodes “+”, “-” and “Ground –
” (kΩ) are
displayed on the screen. To the left from them the circles colored from red up to green
are drawn. If all the three circles are colored green, it means that the impedance val-
ues for all the electrodes are within the norm, and the next stage will be automatically
started in several seconds. At that, the ABR test window presented in the Fig. 23 will
appear on the screen. If the automatic transition does not occur, and the impedance
values, according to your point of view, are satisfactory for the test performing, press
“Start” button to start the testing manually.
Fig. 23. ABR test window.
The window is separated into two parts. The top part represents the response shape
