Frequencies and minimum output levels (dB HL)
Frequency
Supra-aural
Circum-aural
Insert phone
Bone oscillator
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 from IEC 60645-1:2001 applies:
Specification of allowable distortion levels for airborne sound (test level and distortion)
Frequency (Hz)
Test level for
Supra-aural earphone
(dBHL)
Test level for Circum-aural
and Insert earphone
(dBHL)
Allowed THD
(%)
125-250
75
65
2.5
315-400
90
80
2.5
500-5000
110
100
2.5
Specification of allowable distortion levels for bone conducted sound (test level and distortion)
Frequency (Hz)
Test level for
bone vibration
(dBHL)
Allowed THD
(%)
250-400
20
5.5
500-800
50
5.5
1000-4000
60
5.5
For higher output levels than those specified in the tables above, transducers will produce higher distortion levels. The dis-
tortion is generated almost exclusively by the transducers, as the audiometer itself produces negligible distortion. Based
on the extensive knowledge which exists regarding the standard transducers, audiologists should determine if levels higher
than those specified above can be used for a particular test.
122
Otometrics - AURICAL Aud
13 Technical specifications
Summary of Contents for AURICAL Aud
Page 1: ...AURICAL Aud Reference Manual Doc No 7 50 1030 EN 15 Part No 7 50 10300 EN ...
Page 12: ...1 Introduction to AURICAL Aud 12 Otometrics AURICAL Aud ...
Page 70: ...2 Navigating in the OTOsuite Audiometry Module 70 Otometrics AURICAL Aud ...
Page 100: ...5 Unpacking and Installing 100 Otometrics AURICAL Aud ...
Page 104: ...7 Communicating with the device 104 Otometrics AURICAL Aud ...
Page 114: ...11 Troubleshooting 114 Otometrics AURICAL Aud ...