32
In addition to the tympanogram tracing, the screen displays the test
summary data: Ear Canal Volume (ECV), the compliance peak in cm
3
,
the pressure at the peak of the tympanogram in daPa, and the gradient
(GR) as a pressure width value. The test results are automatically stored
in a page of memory. The actual memory location number is deter-
mined by the number of tests which preceded this current test. For ex-
ample, if this is the first test to be stored in memory, it will be assigned
the number M1. If it is the third test to be stored in memory, it will be
numbered M3 and so on.
This test result can be printed out immediately as a single test, by
selecting PRINT SCREEN ONLY button. Other tests can be run
and saved before all tests in memory are printed via the PRINT ALL
button.
3.8.1 Exit Tympanometry Only Mode
To exit Tymp Only Mode, select Tymp/Reflex or Audiometry Mode.
To enter the Tymp/Reflex Mode, press .
3.9 TYMPANOMETRY AND IPSILATERAL REFLEX MODE
The default parameters for this test are tympanometry followed by an
ipsilateral acoustic reflex test at 1000 Hz. To change this default setting,
select the frequencies for the reflex test as described in Section 3.9.1.
Following the tympanometry sequence (see Section 3.8. for details), the
test automatically sequences to the reflex portion of the test as follows:
The pressure from the tympanogram peak compliance is re-established
within the ear canal and is offset by –20 daPa to avoid problems with
extremely sharp tympanogram slopes. With the air pressure held con-
stant throughout the reflex test sequence, the lowest intensity level for
the starting frequency is presented and a measurement of compliance
change is made. If the compliance decreases by at least 0.05 cm
3
, this
reflex intensity level is stored in memory, and the test is completed.
If no response is measured (i.e., a compliance decrease of at least 0.05
cm
3
was not detected) at this lowest intensity level, the intensity level of
the stimulus is automatically increased by 10 dB and a measurement of
compliance change is again made. If a response is detected, the test
sequence for this frequency ends. If once again no response is detect-
able, the intensity level is increased by 10 dB (e.g., 1000 Hz Ipsi = 105
dB HL) and the stimulus is presented. After the compliance measure-
ment is made and a response is detected, this 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, NT appears on
the screen next to the tested frequency, and the test sequence is
TYMP
REFLEX
