AC40 Service Manual Page 15
Calibration properties
Calibrated Transducers:
Earphones:
Telephonics TDH39 with a static force of 4.5N 0.5N
Interacoustics DD45 with a static force of 4.5N 0.5N
Sennheiser HDA200 with a static force of 10N1.0N
Sennheiser HDA280 with a static force of 4.5N 0.5N
Bone conductor:
Radioear B71 with a static force of 5.4N 0.5N
Insert phones: EAR Tone 3A (Option)
EAR Tone 5A (Option)
Accuracies:
Generally the instrument is made and calibrated to be within and better than the tolerances required
in the specified audiometer standards:
Frequency:
0.1%
Pure tone levels:
3 dB for 125 – 4000Hz
5 dB for 6000 – 8000Hz
Speech frequency response : -0/-10 dB at 125 – 249 Hz
3 dB at 250 – 4000 Hz
5 dB at 4001 – 6300 Hz
Tone calibration standards and spectral properties:
Earphones Pure tone: Mean value of PTB report 1.61-4039503/09 and DTU report 27
October 2009 for DD45
ISO 389-1 1998 / ANSI S3.6-2010 for TDH39.
Narrow band noise: Pure Tone + ISO 389-4 1994 values / ANSI S3.6-2010
Spectral properties:
IEC 60645-1 2012/ / ANSI S3.6-2010, Narrow band noise
White noise: SPL
Spectral properties:
IEC 60645-1 2012, White noise
Bone conductor Pure tone:
mastoid
Insert phones Pure tone: ISO 389-2 1994/ ANSI S3.6-2010
Narrow band noise: ISO 389-2 1994 + ISO 389-4 1994 values / ANSI S3.6-2010
Spectral properties:
IEC 60645-1 2012, ANSI S3.6-2010 Narrow band noise, electrically
measured.
White noise: SPL
Spectral properties:
IEC 60645-1 2012, White noise, electrically measured.
Free field output (calibrated
on location)
Pure tone: ISO 389-7 2005 + ISO8253-2 1992/ ANSI S3.6-2010 Free field
Narrow Band noise: ISO 389-7 2005 + ISO8253-2 1992/ ANSI S3.6-2010
Spectral properties:
IEC 60645-1 2012 / ANSI S3.6-2010, Narrow band noise
White noise: SPL
Spectral properties:
IEC 60645-1 2012, White noise 80-20000Hz measured with constant
bandwidth
80-20000Hz measured with 1/3 octave filtering
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