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7. Calibration for Speech Audiometry
ANSI S3.6-1996 specifies the 1 kHz reference-tone level for the speech circuit
as 12.5 dB above the 1 kHz pure-tone reference test threshold for the
earphone in question. Calibration of the E-A-RTONE
performed by setting a 1 kHz signal at 0 VU through the speech circuit, setting
the attenuator to 60 dBHL, and adjusting for 72.5 (60.0 + 12.5) dB SPL in the
2cc coupler. A range of 69.5 to 75.5 dB meets the ±3 dB tolerance allowed
in the standard.
8. Technical Specifications and Limits for E-A-RTONE
Impedance
1 kHz Sensitivity
@ 0.1 Volt rms. (10 Ohm)
@ 0.2 Volt rms. (50 Ohm)
Limits
Distortion
SPL
Maximum output
Safe operating limits
Max. Peak voltage for
1-% duty cycle
Accessories supplied:
50 disposable E-A-RLINK
4 disposable E-A-RLINK
right 1/4" mono color-coded phono-plugs.
Data supplied: 2cc-coupler frequency response chart on individual units.
10 Ohm or 50 Ohm
102.5 dB SPL in DB-0138 (HA-2) coupler
± 3 dB
< 3% measured @ 500 Hz, 118.5 dB
Meets or exceeds 110 dBHL at standard
audiometric frequencies between 500
and 4000 Hz
Max. continuous sine wave drive:
2.5 Volt rms. (10 Ohm)
5.0 Volt rms. (50 Ohm)
10 Volts (10 Ohm)
20 Volts (50 Ohm)
®
3A eartips, 10 disposable E-A-RLINK
®
3C eartips and 213 cm cord (7 feet) with left and
8
®
for speech is thus
®
5A
®
3B eartips,
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