Interacoustics AA222 Instructions For Use Manual page 70

AA222 Instructions for Use – EN
Speech Frequency Response:
(Typical)
TDH39
(IEC 60318-3
Coupler)
DD45
(IEC 60318-3
Coupler)
E.A.R Tone 3A
(IEC 60318-5
Coupler)
IP 30
(IEC 60318-5
Coupler)
B71/B81 Bone
Conductor
(IEC 60318-6
Coupler)
External signal Speech replaying equipment connected to the CD 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 dBVU.
Microphone The included headset is used for live speech presentation. The monitor headset is a
(Live speech) boom type microphone placed near the mouth of the operator. Before live speech is
performed the microphone gain must be adjusted to 0 VU.
Free Field Power amplifier and loudspeakers
With an input of 7 Vrms - Amplifier and loudspeakers must be able to create a Sound
Pressure Level of 100 dB in a distance of 1 meter - and meet the following
requirements:
Frequency Response
125-250 Hz
250-4000 Hz
4000-6300 Hz ±5 dB
Internal storage 500 patients and unlimited sessions/measurements/audiograms
Signal Indicator Time weighting:
(VU) Dynamic range:
Rectifier characteristics:
Selectable inputs are provide with an attenuator by which the level can be adjusted to
the indicator reference position (0dB).
Frequecy Linear (dB)
(Hz) Ext sign
2
Sign
125-250 +0/-2
250- +2/-2
4000 +1/-0
4000-
6300
125-250 +0/-2
250- +1/-1
4000 +0/-2
4000-
6300
250- +2/-3
4000
250- +2/-3
4000
250- +12/-
4000 12
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
Total Harmonic Distortion
+0/-10 dB 80 dB SPL
±3 dB 100 dB SPL
300mS
23dB
RMS
FFequv (dB)
1 1
Int. Ext sign Int.
2
Sign
+0/-2 +0/-8 +0/-8
+2/-1 +2/-2 +2/-2
+1/-0 +1/-0 +1/-0
+1/-0 +0/- +0/-7
+1/-1 +2/-2 +2/-3
+0/-2 +1/-1 +1/-1
+4/-1 (Non
linear)
+4/-1 (Non linear)
+12/- (Non linear)
12
2. Int. sign: Wave
files
< 3%
< 10%
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