Annex 1. Main Specifications
39
Table 3 (continued)
Parameter
Value
Tone burst stimulation:
·
tone
·
stimulus
duration
20–10000 Hz
0.05–50 ms
Click stimulation:
·
stimulus
duration
50–5000 µs with the admissible
relative deviation of ± 2 %.
Continuous tone stimulation:
·
stimulus
types
pure tone;
amplitude, frequency, amplitude and
frequency modulation (
ММ
=Mixed
Modulation), exponential modulation
(A
М
²), stimulus with three carrier
frequencies
·
carrier
frequency
125–16000 Hz (HDA-200, ER-2)
125-8000 Hz (other earphones)
·
modulation
frequency
within the following tolerance ± 2.5 %
20–200 Hz
Maximum total harmonic distortion should not exceed:
·
for air conduction
·
for bone conduction.
2.5%
5.5%
Chirp stimulus (cochlear delay compensation):
·
wide-band
·
narrow-band
250–10900 Hz
500 Hz, 1 kHz, 2 kHz, 4 kHz
(bandwidth — ±1/2 octave)
Stimulus polarity
condensation, rarefaction, alternating
Frequency characteristics of masking noise
white noise (0.02–10000 Hz)
Noise masking intensity
0–127 dB SPL (stimulus relative)
Left/right/double-sided stimulation
yes
Number of bone vibrator channels
1
Stimulus intensity at bone vibrator output
-10 – 80 dB HL
(at 3 kHz frequency)
Bone vibrator amplifier gain
(19.5 ± 0.5) dB
OAE channel
TEOAE stimulation
wide-band click (non-linear)
TEOAE stimulus intensity
30–90 dB SPL
Admissible relative deviation of TEOAE stimulus
intensity
± 3 dB
Frequency range of TEOAE acquisition
0.5–5 kHz
Bandpass flatness:
·
in the band 0.5–2500 Hz
·
in the band 2500–4500 Hz
not more than 6 dB
not more than 15 dB
DPOAE stimulus intensity
0–70 dB SPL
The difference between indicated and actual sound
pressure levels
·
for frequencies up to 4 kHz
·
for higher frequencies (up to 12 kHz)
±3 dB
±5 dB
Frequency range of DPOAE acquisition (3 steps per
octave)
0.5–12 kHz