AmpliVox 270 - Page 25

OM020-9 Model 270 Operating Manual Page 19
Voltage requirement at 0dB
input level setting to zero meter: 1.20Vrms at 1kHz
Output level: 90dBSPL at 1kHz for attenuator setting of
70dBHL with level meter at 0dB
Masking Sounds
Masking sounds available: Narrow bands at test frequencies and
Speech weighted noise
Narrow-band noise bandwidth: Meets IEC 60645-1; ANSI S3.6
Speech noise bandwidth: Meets IEC 60645-2; ANSI S3.6
Reference levels: Refer to ISO 389-4
Insert Masking Earpiece
Calibration method: With 2cc coupler compliant with IEC 126
Transducers
Types and reference levels: DD45: ISO 389-1, Table 2
E-5A: ISO 389-2, Table 1
B-71: ISO 389-3, Table 1
Static headband force: Headphones: 4.5N
Bone vibrator: 5.4N
Bone vibrator calibrated: For mastoid placement &
unoccluded test ear
Sound attenuation characteristics: ISO8253-1, Table 3
Airborne sound from bone vibrator: See Br. J. Audiol. 1980, P73-75
Earphone Sound Attenuation Characteristics
Frequency, Hz
125
250
500
1000
2000
4000
8000
Attenuation, dB
2
5
7
15
25
31
23
Environmental
Operating temperature: +15
o
C to +35
o
C
Operating humidity: 30% to 90% (non-condensing)
Atmospheric pressure: 700 hPa to 1060 hPa
Input / Output
Power input: 2.5mm barrel-type socket.
Mic input impedance: 2500 Ohms
Mic input connection: Mono 3.5mm Jack socket
Line input impedance: 6800 Ohms
Line in/out connections: Stereo 3.5mm Jack Sockets
Patient response input: 6.3mm Jack socket
Left / Right / Bone outputs: 6.3mm Jack socket