User's Manual

52
SPEECH AUDIOMETRY REFERENCE EQUIVALENT THRESHOLD VALUES
IEC 60645-1
TDH39
DD45
ER 3C
B71
Free field
Coupler: ANSI S3.7 (NBS-9A) / IEC
60318-3 (6cc)
IEC 60318-5
IEC 60318-6
Referred to 0
degrees
incidence
dB
[re 20 µPa]
dB
[re 20 µPa]
dB
[re 20 µPa]
dB
[re 1 µN]
dB
[re 20 µPa]
20.0
20.0
20.0
55.0
20.0
Applied to USB, MIC, SPEECH NOISE and WHITE NOISE signals
SPEECH AUDIOMETRY REFERENCE EQUIVALENT THRESHOLD VALUES
ANSI S3.6
TDH39
DD45
ER 3C
B71
Free field
Coupler: ANSI S3.7 (NBS-9A) / IEC
60318-3 (6cc)
IEC 60318-5
IEC 60318-6
Referred to 0
degrees
incidence
dB
[re 20 µPa]
dB
[re 20 µPa]
dB
[re 20 µPa]
dB
[re 1 µN]
dB
[re 20 µPa]
19.5
18.5
12.5
55.0
14.5
Applied to USB, MIC, SPEECH NOISE and WHITE NOISE signals
STATIC CALIBRATION FORCE
Transducer
Force
Supra-aural headphones
4.5 N ± 0.5 N
Bone vibrator
5.4 N ± 0.5 N
PATIENT - OPERATOR COMMUNICATION
Talk-over by way of microphone connected to PC or to device
•
Talk-back by way of headphones connected to PC or to device
•
Patient response button
•