ID: 984 / ver. 204
Using the calibration mode:
When in calibration mode, the tone attenuator keys are used to change the calibration values. Changes
are stored at once when done. The ‘AIR’ key select if the left or right telephone is calibrated. The
frequency keys select the frequency to calibrate. A calibration value is displayed in the right display, and
can be set between 0 and 200, corresponding to -25 dB to +25 dB. Thereby, each step is 1/4 dB. The
TONE button toggles between RETSPL offsets for TDH39 and DD45 telephones.
Presetting the offsets to telephone type:
In addition to altering the offset values manually, they can be preset to one of two sets of offsets. These
two sets are for use with two types of telephones. One set is for TDH39 and the other is for DD45.
While in calibration mode, press the TONE button to preset the offsets. Each press toggles between
the two telephone types. The selected telephone type is shown briefly in the display at each press.
Leaving calibration mode:
Calibration mode is quit by pressing the ‘DATA’ key, or simply by switching off the audiometer.
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