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GSI AudioStar Pro Instructions for Use
C
M
LEANING AND
AINTENANCE
R
M
OUTINE
AINTENANCE
Biological Calibration Check
The design of the GSI AudioStar Pro audiometer should provide trouble-free service for a
long time. It is recommended to routinely record and file the audiogram of one person for
the purpose of biologic calibration. This person (or group of persons) should have a known
stable audiometric curve that does not exceed 25 dB HL at any frequency. This procedure
should start when the GSI AudioStar Pro is first installed and then be continued.
Remember that individual thresholds can shift by as much as 5 dB from day to day;
however, variations that exceed this range can point to difficulties which require attention.
Periodic Checks
The routine maintenance checks described below can detect possible instrument
problems. If any issues are found, the instrument should receive technical service before
further use. The checks should be made at periodic intervals, even if biologic checks reveal
no problems.
Earphone and Bone Vibrator Cords
With extended use, all transducer cords tend to fray internally at the connectors. To
evaluate the cord status, turn on the GSI AudioStar Pro. Set the HL to a comfortably audible
level. Place the transducer on your head. Activate both Interrupt buttons. Bend the cord
next to the plug at both ends of each earphone. Listen for an intermittent signal, abrupt
changes in the signal level, or a scratchy sound that coincides with the flexing of the cord.
The presence of any of these conditions signifies that the cord should be replaced. Repeat
this check for all transducers.
Hum and Noise
Set the GSI AudioStar Pro to Tone test type with the standard earphones selected and the
Channel 1 Interrupt button in the ON mode. Turn the Channel 1 Hearing Level control from
0 to 60 dB HL. Listen for low frequency hum (60 or 120 Hz) and any other noise (hiss or low
rushing sound) at all attenuator levels through the earphone. Some audible noise at levels
above 70 dB is permissible. If these noises are detected below 70 dB, the audiometer
should be scheduled for maintenance. Repeat for Channel 2.
Distortion and Frequency Shift
Check for distortion and frequency shift by listening to the GSI AudioStar Pro's output
through the earphones at each frequency (in the 125 Hz to 12,000 Hz range) at a loud, but
not uncomfortable level (70 to 80 dB HL for normal ears). Listen also to ensure that the
signal frequencies change appropriately when the Frequency up arrow (>) and down arrow
D-0131088 Rev C, 2022-07
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