Interacoustics AD528 - Page 36

D-0121151-B – 2018/11
AD528 - Instructions for Use - EN Page 32
Audiometry measure system
Air Conduction
DD45:
DD450:
IP 30:
ANSI S3.6 2018 / ISO 389-1 2017
ANSI S3.6 - 2018
ISO 389-2 1994, ANSI S3.6-2018
Headband Static Force 4.5N ±0.5N
Headband Static Force 10N ±0.5N
Bone Conduction
B71:
ISO 389-3 1994, ANSI S3.6-2010
Placement: Mastoid
Headband Static Force 5.4N ±0.5N
Free Field
ISO 389-7 2005, ANSI S3.6-2010
Effective masking
ISO 389-4 1994, ANSI S3.6-2010
Patient response
One handheld push button
Patient
communication
Talk forward (TF) and Talk back (TB)
Monitor
Output through built-in speaker, monitor headset or speaker
Special tests/test
battery
SISI, ABLB, Stenger, Tone in noise (Langenbeck), Speech Ch2,
Auto threshold tests: Available time for patient to respond 1 or 2 s: Same as tone
presentation, increment 5 dB.
Warble
1-10 Hz sine +/- 5% modulation
Wave file
44100 Hz sampling, 16 bits, 2 channels
Masking
Automatic selection of narrow band noise (or white noise) for tone presentation and
speech noise for speech presentation.
Narrow band noise: IEC 60645-1:2017, 5/12 Octave filter with the same center
frequency resolution as pure Tone.
White noise:80-8000 Hz measured with constant bandwidth
Speech Noise: IEC 60645-1:2017 125-6000 Hz falling 12 dB/octave above 1 KHz +/-
5 dB
Presentation
Manual or reverse. Single or multiple pulses.
Auto testing: duration 1-2 s adjusted in 0.1 s intervals
Intensity
Check the accompanying Appendix.
Available Intensity Steps is 1, 2 or 5 dB
Extended range function: If not activated, the Air Conduction output will be limited to
20 dB below maximum output.
Frequency range
125 Hz to 8 kHz
Speech
Frequency response
Frequency
(Hz)
Linear
(dB)
FFequv.
(dB)
Ext sign
Int. Sign
Ext sign
Int. Sign
DD45
(IEC 60318-3 Coupler)
125-250
250-4000
4000-6300
+0/-2
+1/-1
+0/-2
+1/-0
+1/-1
+0/-2
+0/-
+2/-2
+1/-1
+0/-7
+2/-3
+1/-1
DD450
(IEC 60318-1 Coupler)
125-250
250-4000
4000-6300
+0/-2
+1/-1
+0/-2
+1/-0
+1/-1
+0/-2
+0/-
+2/-2
+1/-1
+0/-7
+2/-3
+1/-1
IP 30
(IEC 60318-5 Coupler)
250-4000
+2/-3
+4/-1
(Non-linear)
B71 Conductor
(IEC 60318-6 Coupler)
250-4000
+12/-12
+12/-12
(Non-linear)
2% THD at 1000 Hz max output +9 dB (increasing at
lower frequency)
Level range: -10 to 50 dB HL, overall THD <6%
1. Ext. sign: CD input
2. Int. sign: Wave files
External signal
Speech replaying equipment connected to the aux input must have a signal-to-noise
ratio of 45 dB or higher.
The speech material used must include a calibration signal suitable for adjusting the
input to 0 dB VU.
Microphone
(Live speech)
The microphone of the MTH400m is used for live speech. Microphone gain must be
adjusted to 0 VU prior to use.