Welch Allyn TM286 Auto Tymp - User Manual User Manual
Page 29
Directions for Use
Operation
25
default setting established in the Program mode determines the manner in which the
reflex result is displayed. See
4.
If no response is measured (i.e., for 226 Hz probe tone, a compliance change of at
least 0.05 cm
3
was not detected) at the lowest intensity level, the intensity level of
the stimulus is automatically increased by 10 dB. If a response is detected, the test
sequence for this frequency ends and either the result is displayed on the screen or
the test advances to the next frequency selected. However, if no response is
measured, the intensity level is increased by 10 dB (e.g., 1000 Hz Ipsi = 105 dB HL)
and the stimulus is presented.
5.
After the a response is detected, the intensity level is stored as the reflex test result
and displayed on the screen. If no response is detected at the highest intensity level,
either a No or an NR (depending upon the Program mode setting) is indicated on the
screen next to the frequency tested label. If a large pressure leak develops, an NT will
appear on the screen next to the reflex test frequency and the test sequence is
aborted.
6.
The same sequence is followed for each test stimulus selected.
The intensity levels available vary with the frequency selected ipsilaterally as follows
226 Hz Probe Tone
:
Temporary programming of ipsilateral acoustic reflex test frequencies
The instrument defaults to a 1000 Hz Ipsilateral test stimulus when the Tymp Reflex
button is first pressed. Any combination of the four available frequencies (500, 1000,
2000, 4000 Hz) can be selected either temporarily or as revised default parameters. To
temporarily modify the default condition -
1.
Press the Tymp Reflex
button.
2.
Select the test frequencies by pressing the desired Frequency button (e.g., 500 Hz or
1000 HZ). Pressing the Frequency button a second time will deselect that frequency
from the test sequence. Test frequencies must be selected before the probe is in the
ear. Each frequency selected will be indicated on the display. For example, if 2000 Hz
Note
To change the test default frequencies, see
of this manual.
IPSILATERAL
Intensity Levels
500 Hz
80, 90, 100 dB HL
1000 Hz
85, 95, 105 dB HL
2000 Hz
85, 95, 105 dB HL
4000 Hz
80, 90, 100 dB HL
Note
Although four frequencies are available during the tymp and ipsilateral reflex test
mode, most situations require only one or two frequencies to be tested. A
selection of the most commonly used frequencies is available; however, it is
strongly recommended that only one to two frequencies per test are selected.
Holding the probe in the same position for the length of time required to test four
frequencies may become uncomfortable for both the tester and individual being
tested.