b-
STANDARDS
ANSI S3.39
-
1987
ANSI S3.6
-
1989
IEC 1027-l 991
IS0 645
IEC 601-l
Aural Acoustic Impedance and Admittance Standard Type 3
(Middle Ear)
Audiometric Standard Type 4 (Audiometer)
Aural Acoustic Impedance/Admittance Type 3
Type 4 (Audiometer)
Medical Electrical Equipment General Requirements For
Safety
Designed to Meet International Standards Organization requirements fo r
Electro-
Magnetic Compatibility and Safety
ACOUSTIC ADMITTANCE MEASUREMENT SYSTEM
-
AUTO TYMP
Probe Signals
Frequenc y:
226 Hz,
+/-
3%
Sound Pressure Level :
85.5
dB
SPL,
+/-
2.0
dB,
Measured in a 2. 0
cm
3
coupler
(ANSI
Spec
90
dB
SPL Max)
Harmonic Distortion:
<
5%
Acoustic Admittance Range
0.0 to 1.5
cm
3
or 0.0 to 3.0
cm
3
-
selected automatically for compensated
tympanogram.
0.2 to 6.0
cm
3
-
ECV/cavity
limits for initiating pressurization (starting test)
The 0.2 to 6.0
cm
3
is the sum of the ear canal volume and the middle ear admittance.
(Full pressure sweep for 6 cc up to 7000 ft. altitude with no leak)
+/- 5% or
+/-
0.1 cm
3
whichever is greater
Tvmpanogram Gradient:
Pressure interval at 50% of compensated admittance
peak.
Acoustic Admittance Accuracy
To Next Page
Loading...
