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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