AmpliVox 240 - Technical Information - Masking, Transducers, Environment

OM024-6 Model 240 Operating Manual Page 21
Masking Sounds
Masking sounds available: Narrow band at test frequencies
Narrow-band noise bandwidth: Meets IEC 60645-1; 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.
Patient response input: 6.3mm Jack socket
Left / Right / Bone outputs: 6.3mm Jack socket
Insert output: Mono 3.5mm Jack socket
USB: Type B socket
Printer: RJ12 socket (6-way)
Maximum voltage at any output: 12V peak
8 Routine Maintenance
8.1 Audiometer maintenance
The Model 240 audiometer is a precision instrument. Handle it carefully in
order to ensure its continued accuracy and service. When cleaning the
instrument, first disconnect it from the mains supply. Use a soft cloth and