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Nor 1517

Nor 1517. Measurement of Specific Airflow Resistance Ole-Herman Bjor Norsonic AS. Nor 1517. Air flows out. Air flows in. Airflows resistivity [Pa∙s/m 3 ]. Nor 1517. Airflows resistivity [Pa∙s/m 3 ]. Specific airflows resistance [Pa∙s/m]. Airflows resistivity [Pa∙s/m 2 ]. Nor 1517.

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Nor 1517

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  1. Nor 1517 Measurement of Specific Airflow Resistance Ole-Herman Bjor Norsonic AS

  2. Nor 1517 Air flows out Air flows in Airflows resistivity [Pa∙s/m3]

  3. Nor 1517 Airflows resistivity [Pa∙s/m3] Specific airflows resistance [Pa∙s/m] Airflows resistivity [Pa∙s/m2]

  4. Nor 1517

  5. Nor 1517

  6. Nor 1517 A: area of test specimen; d: thickness of test specimen; p: sound pressure observed by the microphone [Pa]; f: frequency of excitation, nominal value 2 Hz; Ap: area of the piston, nominal value; h: peak-to-peak amplitude of the piston movement; V: volume of the vessel; Pa: atmospheric air pressure; : ratio of specific heat Cp/Cv for air, nominal value 1,4.

  7. Nor 1517 Air flows in Air flows out

  8. Nor 1517 Air flows in Air flows out

  9. Nor 1517

  10. Nor 1517

  11. Nor 1517 Heat conduction Adiabatic compression Isoterm compression Correction corresponds to 0,16 dB

  12. Nor 1517

  13. Nor 1517 • Mount the calibration disc and start the motor of Nor1517. • Read the displayed level for the 2 Hz filter band and adjust the sensitivity if required. • Offset the calibration by subtracting 46,1 dB • Set Nor140 to display engineering units (EU) • Switch off the motor and replace the calibration disc with the material to be tested. • Read the specific airflow resistance from the display.

  14. Nor 1517 Direct readout of specific airflow resistance: 269 = 269 Pa∙s/m 90.7k = 90700 Pa∙s/m

  15. Nor 1517 • Measurement according to ISO 9053. • Direct reading of specific airflow resistance. • One large measurement range: 4 – 5 decades. • Calibration level included in measurement range.

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