6 Symbols
The following symbols appear on the audiometer or mains adapter:
Definition: Refer to instruction manual (mandatory).
Definition: Type B applied part – an applied part providing
protection against electric shock, particularly regarding
allowable patient leakage current and patient auxiliary
current.
The applied parts are the left & right earphones, bone
vibrator, insert masker, patient response switch and the
associated cables.
Definition: The output from the mains AC adapter is
Direct Current
Definition: Class II equipment – equipment in which
protection against electric shock does not rely on basic
insulation only, but in which additional safety precautions
such as double insulation or reinforced insulation are
provided, there being no provision for protective earthing
or reliance upon installation conditions.
7 Technical Information
Audiometer
Audiometer type: Type 2 (IEC 60645-1:2001)
Type B-E (IEC 60645-2:1993)
Type 3BE (ANSI S3.6:2004)
Frequency Modulation
Carrier frequencies: 125Hz to 8kHz as per pure tones
Modulation waveform: Sinusoidal
Rising and falling symmetry: Symmetrical on linear frequency scale
Modulating frequency: 15.625Hz
Frequency deviation: +/-10%
Speech Channel
Frequency response: +/- 3dB from 100Hz to 10kHz electrical
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