2.0
SPECIFICATIONS
Audiometric
Test frequencies:
500, 1000, 2000, 4000 Hz
Attenuator range: 15 to 50 dbHL 5 dB steps
Stimulus:
Continuous
Rise/fall time:
35 msec typical
Distortion:
0.5% THD typical, 3% THD maximum
Controls
Front panel:
Intensity, right/left phone,
frequency/stimulus
Mechanical
Dimensions:
2.5” (6.35 cm) wide
6” (15.24 cm) long
7/8” (2.222 cm) deep
Case:
ABS injection molded with light gray
finish
Weight:
2.1lbs with accessories and carry case
Calibration:
Calibrated to ANSI S3.6-1996
10.0 RECALIBRATION
The length of time that an audiometer should be operated
before recalibration varies depending upon the treatment
given the instrument and its headset. Generally speaking,
however, it is recommended that the instrument have a
laboratory recalibration at least once a year.
This can be done as follows:
Since rough
handling can easily cause calibration errors, it is advisable
to establish a biological calibration check as soon as you
receive the instrument.
1.
Make several careful tests of your own hearing,
recording the results properly on the audiogram cards
provided with the instrument.
2.
Conduct similar tests with several young adults on
whom you will be able to make subsequent retests,
recording these on audiogram cards also.
3.
File these audiogram cards where they will be readily
available for comparison with subsequent retests.
Should you feel at any later date that the audiometer’s
calibration may be in error, proceed to make retests on
yourself and the same young adults on whom you made
audiograms previously. If all retests show changes of 10 dB
or more in the same direction at the same frequencies,
calibration is probably in error. If repair and recalibration is
needed, be sure the work is done by a Maico Special
Instrument Service Center. This assures the use of quality
materials by trained and experienced technicians using
accurate and reliable test equipment.
2
15
