eMoyo KUDUwave - Page 89

eMKW-TD0054-21- Page 88
Tympanometry General
Tympanometer transducer
KUDUwave™ built-in transducer
Influence of ambient pressure and
temperature on calibration
The KUDUwave™ Pro TMP contains an environmental sensor which measures
atmospheric pressure, temperature and relative humidity. Conversion between
volume and admittance is handled automatically. The unit will ask for recalibration
with the calibration cavities if the environment changes significantly.
Probe dimensions
Use only the tympanometry probes (identified on the packaging)
Maintenance information
The probe should be visually inspected at each use. If it is dirty it should be cleaned
using the cleaning kit provided. If it shows signs of damage it should be replaced
with a new probe.
Probe Signal
Frequencies
226Hz
Level
85 dB SPL (≈ 69 dB HL) ±3 dB in an IEC 60318-5 coupler
Typical variation with loading:
6 dB at 0.5 cm³, 0 dB at 2 cm³, -6 dB at 5 cm³
Frequency accuracy
±1%
THD
<1%
Pneumatic system
Pressure range
+400 daPa to -600 daPa
Speed
50 daPa/s
200 daPa/s
400 daPa/s
Direction
Positive-to-negative and negative-to-positive
Maximum limits
-750 daPa and +550 daPa as measured in a 0.5 cm³ cavity
Safety mechanism
Automatic valve release at safety maximum limits
Pressure accuracy
±10 daPa or ±10%, whichever is greater (in cavities from 0.5 cm³ to 5 cm³)
Speed accuracy
50 daPa/s: ±10 daPa/s
200 and 400 daPa/s: ±40 daPa/s
(in cavities from 0.5 cm³ to 5 cm³)
Control
Automatic or manual
Indicator
Graphical display on PC
Admittance Measurement
Units
cm
3
or acoustic mmho (1 acoustic mmho = 10
-8
m
3
/(Pa⋅s)
Range
0.2 cm³ to 5 cm³ (measurement plane)
Accuracy
±5% or ±0.1 cm³ of the equivalent volume or ±0.1 acoustic mmho, whichever is
greater.
This is applicable for both static and dynamic modes of operation
Dependence on barometric
pressure
The KUDUwave™ Pro TMP contains an environmental sensor which
automatically compensates for the conversion between volume and admittance