ID: 984 / ver. 204
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Page 1: ...ID 984 ver 204 1...
Page 2: ...the displayed sound level when the device is in normal operation mode to obtain the ISO hearing level When in calibration mode these offsets are not effective Therefore all frequencies should be calib...
Page 3: ...ffsets 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...
Page 4: ...not necessary to disassemble the cabinet If clicks are heard in the telephones when changing channel between left and right an adjustment of the trimmer should be done Connect a digital voltmeter to t...
Page 5: ...lter on the calibration equipment to 125Hz Adjust to 80dB plus microphone correction factor deflection on the calibration equipment Set the audiometer and the bandpass filter to the next frequency and...
Page 6: ...5 250 500 750 1000 1500 2000 3000 4000 6000 8000 45 25 5 11 5 7 5 7 6 5 9 10 9 5 15 5 13 RETSPL table for DD45 telephones These values are store in the audiometer s memory by default Hz dB 125 250 500...
Page 7: ...tandard or if the ISO standard is changed This is done in a special mode activated by holding down the keys FREQUENCY DOWN MASKING ATTENUATOR DOWN and MASKING ATTENUATOR UP while powering on the devic...
