Piston PDD-401, Руководство по эксплуатации

Страница: 23 / 41

Configuration of Automatic sequence
22 - Audiometer
Type of iteration
To select the type of iteration click at the appropriate radio
switch:
•
Ascending
•
Descending
Test frequencies
The frequencies to be included in to the automatic sequence
can be specified arbitrary.
Selection of test frequencies
Click at the desired frequency in the [Frequency] window
and push the [>>] add button. The selected frequency appears in
the [Tests] window at the lower position.
The frequency in the very first position is the Basic
frequency . The hearing level at the Basic frequency is
measured twice during the automatic sequence and called as the
Control frequency .
Modifying the sequence of frequencies
Click at frequency to be moved and push any of the [ ] [ ]
positioning buttons. The Basic frequency can’t be moved or
replaced. The Basic frequency can be deleted in this case the
next frequency becomes the Basic frequency .
Deleting a frequency
Click at the frequency to be deleted and push the [Delete]
button.
Number of trials
Number of trials at the same frequency should be specified.
The default value is 5.
Criteria of acceptance
The number of equivalent hearing levels at the same
frequency should be specified. Obviously this number can not
be higher than the number of trials. The default value is 3.