Description and Operation
11
2.2. Main Specifications
Table 1. The Screening System Specifications
Parameters
Values
ABR Technique
Recorded EP range
0.15–900 µV
Common-mode rejection
not less than 100 dB
Noise level (rms)
not more than 0.35 µV
Amplifiers input impedance
not less than 90 MΩ
Amplifiers input capacity
not more than 40 pF
Differential input bias voltage, maximum permissible
(300
30) mV
Bandpass flatness in the range from 200 up to 3000 Hz
-30
5%
Electrode impedance range
0.5–500 kΩ
Stimulus intensity range for OAE probe
0-60 dB HL
Stimulus intensity range for TDH-39 headphones
0–100 dB HL
Stimulation frequency range
9–93 Hz
with 1 Hz step
TEOAE Technique
Frequency range
400–5000 Hz
Stimulus intensity range
50–90 dB SPL
Stimulus spectrum flatness
in the frequency range 0.5–2.5 kHz
in the frequency range 0.5–5 kHz
not more than 10 dB
not more than 20 dB
Noise level in the frequency range 500–5000 Hz
not more than 30 dB SPL
DPOAE Technique
Frequency range
0.5–12 kHz
Stimulus intensity range
30–75 dB SPL
Stimulus 3rd order intermodulation
not more than -80 dB
General Parameters and Specifications
Automatic result analysis
yes
Indication of probe setting quality
yes
Number of measurements saved in a device memory:
TEOAE
DPOAE
ABR
from 320 up to 1000
from 260 up to 700
from 1300 up to 4000
Number of patient cards saved in device memory:
TEOAE
DPOAE
ABR
from 320 up to 500
from 260 up to 350
from 1300 up to 2000
Operating time of electronic unit at rechargeable battery use
from 7 up to 10* hours
LCD
3.5" with resolution not less
than 640
480
