Welch Allyn GSI 38, Service Manual

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INTRODUCTION
INSTRUMENT DESCRIPTION
The probe indicators are show in Figure 2-1 and a description follows.
The GSI 38 Auto Tymp is a versatile combination instrument which provides testing
capability for tympanometry alone, tympanometry combined with screening acoustic
reflex measurements, and screening audiometry. Four different versions are available
to meet your individual testing needs. The basic version provides two modes of
operation, tympanometry alone and tympanometry plus screening ipsilateral acoustic
reflex testing. A second version permits tympanometry alone and tympanometry
combined with ipsilateral and contralateral screening acoustic reflex measurements.
The third version provides testing capability for all three test modes, i.e., tympanometry
alone, tympanometry combined with ipsilateral and contralateral screening acoustic
reflex measurements, and screening audiometry. Finally, the fourth version allows
tympanometry alone, tympanometry combined with ipsilateral acoustic reflex screening
testing and screening audiometry. It is possible to field retrofit versions one, two and
four with the full functionality provided with version number three after the time of
original purchase.
PROBE INDICATORS
Figure 2-1: Probe Indicators
P I Yellow:
the probe is occluded; remove the probe and inspect for cause of
occlusion
P2 Green lamp:
blinking GSI 38 Auto Tymps is ready to begin a Tymp; steady
green test successfully started and in progress.
P3 Orange:
a pressure leak has been detected.
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