Welch Allyn AM 232 Manual Audiometer - User Manual - Manual (Page 7)

7 12-16-08
Specifications
Standards
The AM 232 Manual Audiometer meets ANSI S3.6 and IEC 645 Type 4 Audiometer
Standards.
UL 60601-1 Medical Electrical Equipment Requirements for Safety
IEC/EN 60601-1 General Requirements
CSA C22.2 No.601-1-M90
Protective Classification
This system is intended for continuous operation and has a protective classification
of Class II, Type B.
Class II Type B equipment symbols
Degree of protection against harmful ingress of water: Ordinary (no protection)
Frequency Range
Discrete Frequencies: 125, 250, 500, 750, 1000, 1500, 2000, 3000, 4000, 6000, 8000 Hz
Accuracy: ±3%
Total Harmonic Distortion: <2%
Intensity
Ranges: 125 Hz:
-10 to 50 dB HL
500 to 6000 Hz: -10 to 90 dB HL
250 and 8000 Hz: -10 to 70 dB HL (Increments of 5 dB steps)
Note: A “+10” dB switch extends maximum at all frequencies by 10 dB.
Accuracy: 125 to 4000 Hz: ±3 dB
6000 to 8000 Hz: ±5 dB
Signal to Noise Ratio: >70 dB
Tone Type
Rise/Fall Time:
20-50 msec
Continuous: Steady when present bar depressed
Pulsed: 2.5 pulse/sec
FM: 5 Hz, ±5%
Head set
Telephones TDH39 Earphones with MX41AR Cushions (60 ohm impedance).