Chapter 1
The probe The innovative lightweight probe is designed for patient comfort, ease-of-seal, and
accurate test results. A wide variety of both standard and special sized eartips are
supplied with the GSI TympStar to hermetically seal the ear canal. In addition, a set
of screening eartips is provided for screening tymp and reflex tests.
The operator has a choice of three mountings to support the probe box; the
standard lightweight shoulder mounting, standard clothes clip, or an optional
operator wrist attachment. The probe box has 2 LED’s to indicate test status.
Within the probe box, there are two small loudspeakers, a microphone and a
pressure transducer. One loudspeaker delivers the probe tone to the ear canal,
while the microphone monitors the intensity of the probe tone within the ear canal.
The second loudspeaker delivers the ipsilateral (ipsi) stimuli to the ear canal.
The contralateral (contra) insert phone contains its own loudspeaker. The
pressure within the ear canal can be varied within the range of +400 daPa
to -600 daPa. At no time is it possible to exceed specified maximum
limits. Pressure can be varied automatically or manually and from nega-
tive to positive or from positive to negative values. Pressure within
the ear canal is monitored continuously in order to maintain pressure
accuracy throughout each test sequence.
1 - 4 Grason-Stadler
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