Interacoustics AC40 - Page 56

AC40 Instructions for Use - US Page 52
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 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
Presentation
Manual or Reverse. Single or multiple pulses.
Intensity
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.
Frequency range
125Hz to 8kHz (Optional High Frequency: 8 kHz to 20 kHz)
125Hz, 250Hz, 750Hz, 1500Hz and 8kHz may freely be deselected
Speech
Frequency Response:
(Typical)
Frequency
Linear [dB]
FFequv [dB]
[Hz]
Ext.
sign
1
Int. sign
2
Ext.
sign
1
Int. sign
2
TDH39
(IEC 60318-3 Coupler)
125-250
+0/-2
+0/-2
+0/-8
+0/-8
250-4000
+2/-2
+2/-1
+2/-2
+2/-2
4000-6300
+1/-0
+1/-0
+1/-0
+1/-0
DD45
(IEC 60318-3 Coupler)
125-250
+0/-2
+1/-0
+0/-8
+0/-7
250-4000
+1/-1
+1/-1
+2/-2
+2/-3
4000-6300
+0/-2
+0/-2
+1/-1
+1/-1
E.A.R Tone 3A
(IEC 60318-5 Coupler)
250-4000
+2/-3
+4/-1
(Non linear)
IP 30
(IEC 60318-5 Coupler)
B71 Bone Conductor
(IEC 60318-6 Coupler)
250-4000
250-4000
+2/-3
+12/-12
+4/-1
+12/-12
(Non linear)
(Non linear)
2% THD at 1000 Hz max output +9 dB
(increasing at lower frequency)
Level range: -10 to 60 dB HL
1. Ext. sign: CD input
2. Int. sign: Wave files
External signal
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.
Free Field output
(non-powered)
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
Total Harmonic Distortion
80 dB SPL < 3%
100 dB SPL < 10%
Internal storage
500 patients and 50.000 sessions/measurements/audiograms (may depend on session
type/size)
Signal Indicator(VU)
Time weighting: 300mS
Dynamic range: 23dB
Rectifier characteristics: RMS
Selectable inputs are provide with an attenuator by which the level can be adjusted to the
indicator reference position(0dB)
Data Connections (sockets) for
connection of accessories
4 x USB A
1 x USB B for PC connection (compatible with USB 1.1 and later)
1 x LAN Ethernet (not used)
External devices (USB)
Standard PC mouse and keyboard (for data entry)
Supported printers: Please contact local distributer for a list of approved PC printers.
HDMI output
Provides a copy of the built-in screen in HDMI format 800x600 resolution
Input Specifications
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
TF (side panel)
212uVrms at max. gain for 0dB reading
Input impedance : 3.2KOhm
TF (front panel)
212uVrms at max. gain for 0dB reading
Input impedance : 3.2KOhm
Wave files
Plays wave file from internal SD card