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Technical Specifications |
A/D board
The EVA2 interface is
connected to a high-end acquisition board :
- 16 bits accuracy A/D conversion on 16 channels, +/- 10 V
- A/D conversion frequency up to 100 kHz
- Effective Number of Bits=13.5
- Signal/Noise ratio=82 dB (standard PC sound boards SNR=40 to 50 dB)
- USB technology
- Plug & Play facilities
Inputs
- sound channel #1
- 25 kHz sampling frequency
- high-end microphone or line or mouthpiece microphone
- allows SPL measurement (range 110 dB)
- switchable "A" weighting
- sound channel #2
- 25 kHz sampling frequency
- high-end microphone or line or electroglottograph (EGG)
- oral airflow :
- sampling frequency 6250 Hz
- up to 10 l/s
- autoreset
- nasal airflow
- sampling frequency 6250 Hz
- up to 3 l/s
- autoreset
- pressure #1
- sampling frequency 6250 Hz
- up to 100 hPa
- autocalibration
- pressure #2
- sampling frequency 6250 Hz
- up to 200 hPa
- autoreset
- auxilliary input
- sampling frequency 6250 Hz
- maximal current 50 mA
Outputs
- stereophonic
- by headset or 30 W professional loudspeaker(s).
- lines outputs available.
Measurements
EVA2 workstation
provides real time and accurate measurements using sophisticated combination of
its hardware and software.
- Fundamental frequency : computed using sound input (sampling frequency 25
kHz)
- Intensity SPL or subjective intensity weighted by normalized "A"
curve (for phonetogram)
Secondary measurement are provided : jitter, signal/noise ratio...)
Sensors
EVA2 system measures
airflow using a wide-range, grid pneumotachograph featuring low dead space and
high linearity. Pressure is measured using highly linear piezoelectric sensors
with short response time.(more ...)
Conformity
EVA2 is
compliant.
Conformity for class 1 type BF equipment in respect of safety of medical
electrical equipment with regards to the following standards : EN 60 601 - 1
(1991)
Conformity in respect of Electromagnetic Compatibility of medical electrical
equipment with regards to the following standards : EN 60 601 1-2 (1993)
including :
- EN 55 011 : emission requirements of ISM equipment
- EN 61 000 4-5 : basic immunity standard for surge
- CEI 801-2 : ESD immunity requirements for IPMC equipment
- CEI 801-3 : Immunity to radio frequency Em-fields for ISM equipement
- CEI 801-4 : Burst immunity requirements for IPMC equipment EC compliant