TM 262
7-4 Revised 4/11/08
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
Tymp Test Time: Approximately 1 second
NOTE: High compliance tympanograms will take
somewhat longer.
Gradient: Tympanogram pressure with 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 Hz80, 90,100 db HL
1000 and 2000 Hz85, 95, 105 dB HL
NOTES:
1. psi stimuli are time multiplexed with probe tone (106
mS ON, 53 mS 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 (4 maximum) and intensity required.
Probe LED Indicators
Steady yellow: Occlusion
Blinking green: Ready to start
Steady green: Testing test in progress
Steady orange: Leak
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