Operating Instructions
7
3.2 Internal Probe
The internal probe is located on the underside of the
ERO•SCAN Pro instrument. It allows for the measurement of
DPOAEs in the range of 1.5 kHz to 6 kHz and TEOAEs in the
range of 0.7 kHz to 4 kHz.
Note: Tympanometry, acoustic reflex,
DPOAE measurements are not supported by the internal probe
of the ERO•SCAN Pro.
The internal probe consists of a patented dual isolated spring
design which prevents hand movement from being transferred
to the ear canal where it would be measured as noise (a
common problem with any truly handheld OAE probes). The
inter
nal probe assembly houses the microphone which
measures the acoustic information present in the ear canal and
the tubing which carries the stimulus from the receiver(s) to the
ear canal. Interface of the instrument to the ear canal is
accomplished through
disposable eartips made of industrial
elastomer, which fit onto the probe tip. A disposable internal
probe tip snaps to the shaft of the spring assembly and serves
as an attachment point for the disposable eartips.
3.3 External Probes
There are two types of external probe available for use with the ERO•SCAN Pro instrument. Each
consists of the following basic parts:
Connection cable – connects probe to ERO•SCAN Pro instrument by way of the connector
Probe enclosure – contains the circuitry, one receiver, and, in the case of the Tymp•OAE
Probe, the pump and pressure sensor
Keypad – consists of LED status indicators and Right/Left test start buttons
Probe cable – connects the probe enclosure to the probe head
Probe head – contains the microphone and one receiver
Probe tip – disposable tip onto which the eartip is affixed for sealing to the ear
OAE•Probe™
The OAE•Probe allows for the measurement of:
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