Pneumatic System; Acoustic Reflex Stimuli - Welch Allyn TM286 Directions For Use Manual

62 Standards, Specifications, and Accessories

Pneumatic System

Pressure Range:
Pressure Accuracy:
Rate of Sweep:
Direction of Sweep
Tympanogram Test Time:
Gradient:

Acoustic Reflex Stimuli

Frequencies:
Accuracy:
Total Harmonic Distortion:
Rise/Fall Time:
Transducers
IPSILATERAL:
Output Levels
IPSILATERAL:
Pressure:
Reflex Determination:
Reflex Test Time:
Notes:
1. 1 daPa = 1.02 mm H 0
2
2. The pressure sweeps to at least -100 daPa. To save test time, pressure
sweep stops when tympanogram returns to baseline after -100 daPa.
3
3. Full pressure sweep for 5 cm
leak.
600 daPa/sec except near tympanogram peak where sweep rate slows to
200 daPa/sec to provide better definition of peak compliance.
Note
High compliance tympanograms will take somewhat longer.
Measurement of the tympanogram width taken at 50% of peak
500, 1000, 2000, and 4000 Hz for ipsilateral stimulation
<5% for outputs less than 110 dB HL and <10% at 110 dB HL
NOTES:
1. Ipsilateral stimuli are time multiplexed with probe tone (93 ms ON, 66 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.
Reflex measures are set automatically to pressure at peak compliance with
an offset of -20 daPa if peak pressure is negative and +20 daPa if peak
1 to 12 seconds depending upon the number of ipsilateral
test frequencies selected (4 maximum) and intensity required.
Welch Allyn TM286 Auto Tymp
+200 to -400 daPa
from sea level to 7000 ft. altitude with no
±10 daPa or ±15%, whichever is greater
Positive to negative
Approximately 1 second
compliance.
5 to 10 msec
Probe Assembly
500 and 4000 Hz: 80, 90,100 dB HL
1000 and 2000 Hz: 85, 95, 105 dB HL
pressure is positive.
3
Compliance change of 0.05 cm
±3%
or greater.