•
Calibration of speech signals is performed using either a 1 kHz pure tone (earphones) or 1 kHz warble tone (loud-
speakers).
Transducer type
Coupler/ear simulator
Supra-aural earphone
IEC 60318-3
HDA300
IEC 60318-1
Insert earphones
IEC 60318-5
Attenuator
1 or 5 dB step resolution over the entire range.
HL Range
The maximum output levels from Aurical Aud depend on the actual sensitivity of the individual transducers, and they will
be slightly different for each unit. However, the minimum requirements from IEC 60645-1:2007 and ANSI 63.6:2004 are
fulfilled for all units.
They are specified in the following.
Frequencies and minimum output levels (dB HL)
Frequency
Supra-aural
Circum-aural
Insert phone
Bone conductor
125
60
60
60
N/A
250
80
80
80
45
500
110
110
110
60
1000
110
110
110
70
1500
110
110
110
70
2000
110
110
110
70
3000
110
110
110
70
4000
110
110
110
60
6000
100
100
100
N/A
8000
90
90
90
N/A
Distortion of signals occurs for higher stimulus levels. Aurical Aud complies with IEC and ANSI standards with respect to
maximum distortion. The following specification IEC 60645-1:2017 applies:
24
Aurical Aud
17 Technical specifications
