Maico MA 1 Manuel d'utilisation - Page 5

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2.0

SPECIFICATIONS

Audiometric

Test frequencies:

Attenuator range:

Stimulus:

Rise/fall time:

Distortion:

Controls

Front panel:

Mechanical

Dimensions:

Case:

Weight:

Calibration:

500, 1000, 2000, 4000 Hz

15 to 50 dbHL 5 dB steps

Continuous

35 msec typical

0.5% THD typical, 3% THD maximum

Intensity, right/left phone,

frequency/stimulus

2.5" (6.35 cm) wide

6" (15.24 cm) long

7/8" (2.222 cm) deep

ABS injection molded with light gray

finish

2.1lbs with accessories and carry case

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.

handling can easily cause calibration errors, it is advisable

to establish a biological calibration check as soon as you

receive the instrument.

This can be done as follows:

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.

Since rough