Items tagged with INTER-COMPARISON Files

File size: 9.89 MB Download

Intercomparison of sandboxes used for testing joints for district heating pipes (NT TR 495)

NT TR 495

  • An intercomparison has been carried out between 3 laboratories concerning a type test for joints according to EN489 District heating pipes – Pre-insulated bonded pipe systems for directly buried hot water networks - Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene.

File size: 701.90 KB Download

Laboratory measurement of sound insulation in the frequency range 50 Hz to 160 Hz – A Nordic intercomparison (NT TR 489 - edition 1)

NT TR 489 - Edition 1

  • Five Nordic laboratories have carried through an intercomparison concerning laboratory measurements of sound insulation at low frequencies. Measurements have been carried out on two different test objects – a sandwich steel plate and a window - in the frequency range 50 Hz to 160 Hz according to ISO/DIS 15186-3, which describes a new test method based on intensity technique.

File size: 710.23 KB Download

Laboratory measurement of sound insulation in the frequency range 50 Hz to 160 Hz – A Nordic intercomparison (NT TR 489)

NT TR 489

  • Five Nordic laboratories have carried through an intercomparison concerning laboratory measurements of sound insulation at low frequencies. Measurements have been carried out on two different test objects – a sandwich steel plate and a window - in the frequency range 50 Hz to 160 Hz according to ISO/DIS 15186-3, which describes a new test method based on intensity technique.

File size: 913.26 KB Download

Methodology of inter-comparison tests and statistical analysis of test results (NT TR 482)

NT TR 482

  • This report describes how to organise inter-comparison tests and how to statistically analyse the test results.

File size: 7.25 MB Download

Nordic intercomparison programme in the field of acoustics – 3. Measurement: Field measurements of airborne sound insulation (NT TR 290)

NT TR 290

  • An Intercomparison concerning field measurements of airborne sound insulation has been carried through by five participating laboratories from the 22nd to the 25th August 1995. Three different test methods were used: The traditional ISO 140-4 method, a proposed new simple survey method and an intensity scanning method.

    For the measurements carried out according to ISO 140-4 the reproducibility shows good agreement with the reference values stated in ISO 140-2.

    With the survey method a surprisingly good reproducibility is obtained even for the more difficult room types.

    The achieved reproducibility for the intensity method is acceptable. During the measurements some proposals for improvement of the intensity method were found.

Nordtest

Nordtest is a trademark of Nordic cooperation in conformity assessment. The emphasis of Nordtest is to develop, promote and innovate Nordic test methods and pre-normative activity. Nordtest endeavours to remove technical barriers to trade and promotes the concept: “Approved once, accepted everywhere”.