Welch Allyn TM 262 Auto Tymp - User Manual - Manual (Page 51)

Revised 4/11/08 3-17
Operation
e. After the compliance measurement is made and a response is detected, the highest
intensity level is stored as the reflex test result and displayed on the screen. If no
response is detectable at this third and highest intensity level, either a No or an NR
(depending upon Program mode setting) is indicated on the screen next to the
frequency tested label. If during any of the three stimulus presentations a large
pressure leak develops, an NT will appear on the screen next to the frequency where
it occurred and the test sequence is aborted.
f. The same sequence is followed for each test stimulus selected. The first stimulus
presentation occurs at the lowest level available for the stimulus selected. If a
compliance change of 0.05 cm
3 or greater is detected, the test sequence for this
particular test stimulus ends at this lowest level. If no compliance change of at least
0.05 cm
3 is detected, the test automatically increases the stimulus intensity by 10 dB
and this same frequency is repeated at this next higher level. Once again if a
compliance change of 0.05 cm
3 is detected, this sequence ends at this level and the
intensity level is stored.
g. Finally, if there is no detectable response at the second intensity level, the test
automatically increases the stimulus intensity by another 10 dB and the same
stimulus is repeated for a third and final time. If a response is detected, this third level
is stored in memory as the test result. If no response is detectable at this third and
highest intensity level, the test is considered a no response (NR) or as a No depending
upon the program mode default setting. In other words, for each test stimulus
selected, a maximum of three different stimulus intensity levels are available for the
test. The test sequences through each of the intensity levels only if required to obtain
a measurable result. Thus, if the individual being tested responds to the lowest level,
there is no addition-al stimulus presentation necessary for this particular stimulus.
This test protocol aims to save test time and to limit the number of circumstances
where the higher level stimulus presentations are made.
The three intensity levels available vary with the frequency selected ipsilaterally as follows:
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. You can choose from a
selection of the most commonly used frequencies. However, it is strongly recommended that
you select only one to two frequencies per test since holding the probe in the same position for
the length of time it takes to test four frequencies may become a problem for both you and the
individual being tested.
IPSI 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.