Welch Allyn TM286, Directions For Use Manual

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30 Operation Welch Allyn TM286 Auto Tymp
3. When a valid response occurs, the intensity for the next stimulus presentation is
decreased 10 dB. When no valid response occurs, the intensity of the next stimulus
presentation is increased 5 dB. This is based on the Hughson-Westlake down 10, up 5
dB rule used by most audiologists during threshold testing.
4. The system will determine the response to be valid if the patient response switch is
pressed during the stimulus or for 2 seconds following the stimulus off time.
5. The system will determine the patient response to be invalid based on the following
occurrences:
a. The patient response switch is pressed during the stimulus on time, but not
released before the start time for the next intensity presentation.
b. The patient response switch is pressed and released only during randomized
inter- stimulus interval.
c. The patient response switch is pressed and released more than 2 times during
the stimulus on and completion of inter-stimulus interval.
Threshold results are displayed as they are saved for each frequency. When the first ear
test sequence is completed, the audiometric thresholds for all the frequencies tested are
stored in memory. At the start of the second test ear sequence, the results on the LCD
will be cleared to display the second ear results. When the second ear sequence is
completed, the entire audiogram containing thresholds for both ears are stored in
memory. The threshold series for any frequency will be considered invalid if a threshold is
not achieved within 18 stimulus presentations, or if the retest result at 1000 Hz doesn't
agree within 5 dB of the first result. If the threshold results are considered invalid, the
system will exit the Auto HL procedure. The audiogram results obtained thus far will be
kept and displayed so that the test can be completed manually.
Performing the Auto HL Procedure
1. Instruct the patient to press the button on the handswitch when s/he hears the tone
and release the button when the tone goes off.
2. Carefully place the headphones or insert earphones.
3. To begin the Auto HL procedure, press the AUD button and hold it for 3 seconds. The
words Auto HL will be displayed at the bottom right corner of the LCD indicating that
the Auto HL procedure has been engaged. The first stimulus will be presented when
the
AUD button is released. When a signal is presented, the Speaker symbol will
display on the LCD.
4. When all frequencies have been successfully tested the Auto HL will disappear from
the LCD indicating the test is finished.
Exit audiometry
There are two ways to exit the audiometry mode.
a. Select the Tymp mode button
- or -
b. Select the Tymp Reflex mode
For details on programming the Auto HL procedure, refer to “Programming the Auto HL
Procedure” on page 36.