Interacoustics AC40 Gebrauchsanweisung Seite 1268

AC40 Instructions for Use - US
Pediatric Noise
Wave file
Masking
Presentation
Intensity
Frequency range
Speech
External signal
Free Field output
(non-powered)
Internal storage
Signal Indicator(VU)
Data Connections (sockets) for
connection of accessories
External devices (USB)
HDMI output
Input Specifications
A special narrowband noise stimulus. The bandwidth is frequency depended 125-250 Hz
29%, 500Hz 24%, 750 Hz 20%, 1kHz 17%, 1.5kHz 13%, 2kHz 11%, 3kHz 9% from 4kHz
and up is fix 8%,
44100Hz sampling, 16 bits, 2 channels
Automatic selection of narrow band noise (or white noise) for tone presentation and speech
noise for speech presentation.
Narrow band noise:
IEC 60645-1 2012, 5/12 Octave filter with the same centre frequency resolution as pure
Tone.
White noise:
80-20000Hz measured with constant bandwidth
Speech Noise.
IEC 60645-2:1993 125-6000Hz falling 12dB/octave above 1KHz +/-5dB
Manual or Reverse. Single or multiple pulses.
Check the accompanying Appendix
Available Intensity Steps is 1, 2 or 5dB
Extended range function: If not activated, the Air Conduction output will be limited to 20 dB
below maximum output.
125Hz to 8kHz (Optional High Frequency: 8 kHz to 20 kHz)
125Hz, 250Hz, 750Hz, 1500Hz and 8kHz may freely be deselected
Frequency Response:
(Typical) Frequency
[Hz]
TDH39 125-250
(IEC 60318-3 Coupler)
250-4000
4000-6300
DD45 125-250
(IEC 60318-3 Coupler) 250-4000
4000-6300
E.A.R Tone 3A 250-4000
(IEC 60318-5 Coupler)
IP 30 250-4000
(IEC 60318-5 Coupler)
B71 Bone Conductor 250-4000
(IEC 60318-6 Coupler)
2% THD at 1000 Hz max output +9 dB
(increasing at lower frequency)
Level range:
1. Ext. sign: CD input
Speech replaying equipment connected to the CD inputs 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.
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 +0/-10 dB
250-4000 Hz ±3 dB
4000-6300 Hz ±5 dB
500 patients and 50.000 sessions/measurements/audiograms (may depend on session
type/size)
Time weighting:
Dynamic range:
Rectifier characteristics:
Selectable inputs are provide with an attenuator by which the level can be adjusted to the
indicator reference position(0dB)
4 x USB A
1 x USB B for PC connection (compatible with USB 1.1 and later)
1 x LAN Ethernet (not used)
Standard PC mouse and keyboard (for data entry)
Supported printers: Please contact local distributer for a list of approved PC printers.
Provides a copy of the built-in screen in HDMI format 800x600 resolution
TB 212 uVrms at max. gain for 0dB reading
Input impedance : 3.2KOhm
Mic.2 212 uVrms at max. gain for 0dB reading
Input impedance : 3.2KOhm
CD1/2 16mVrms at max. gain for 0dB reading
Input impedance : 47KOhm
Linear [dB]
2
Ext. Int. sign
1
sign
+0/-2 +0/-2
+2/-2 +2/-1
+1/-0 +1/-0
+0/-2 +1/-0
+1/-1 +1/-1
+0/-2 +0/-2
+2/-3 +4/-1 (Non linear)
+2/-3 +4/-1 (Non linear)
+12/-12 +12/-12 (Non linear)
-10 to 60 dB HL
2. Int. sign: Wave files
Total Harmonic Distortion
80 dB SPL < 3%
100 dB SPL < 10%
300mS
23dB
RMS
Page 52
FFequv [dB]
2
Ext. Int. sign
1
sign
+0/-8 +0/-8
+2/-2 +2/-2
+1/-0 +1/-0
+0/-8 +0/-7
+2/-2 +2/-3
+1/-1 +1/-1