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Rate of Sweep:
600 daPa/sec except near tympanogram peak
where sweep rate slows to 200 daPa/sec to provide better
definition of peak compliance.
Direction of Sweep:
Positive to negative
Tympanometric Test Time:
approximately one second
NOTE:
High compliance tympanograms will take somewhat longer
Gradient:
Tympanogram pressure width at 50% of peak
compliance.
ACOUSTIC REFLEX STIMULI:
Frequencies:
500, 1000, 2000, and 4000 Hz
Accuracy:
±3%
Total Harmonic Distortion:
<5%
Rise/Fall Time:
5 to 10 msec
Output Levels:
IPSI: 500 and 4000 Hz:80, 90, 100 dB HL
1000 and 2000 Hz: 85, 95, 105 dB HL
NOTE:
1. Ipsi stimuli are time multiplexed with probe tone
(106 msec ON, 53 msec OFF).
2. Stimuli are presented at lowest level first. If there is no
response, the intensity is increased by 10 dB until a
response is detected or the maximum dB HL is reached.
Pressure:
Automatically set to pressure at peak compliance with
an offset of –20 daPa.
Reflex Determination:
Compliance change of 0.05 cm
3
or greater.
Reflex Test Time:
1 to 12 seconds depending upon the number of ipsi
test frequencies selected (four maximum) and intensity required.
Probe LED Indicators:
Steady yellow: occlusion
Blinking green: ready to start testing
Steady green: test in progress
Steady orange: leak
