NMO testing facilities

Test laboratories and chambers used for testing under the Measuring Instruments Directive (MID) 2004/22/EC

NMO Certification and Technical Services, which is part of the Office for Product Safety & Standards, is a notified body under the Measuring Instruments Directive (MID) and Non Automatic Weighing Instruments (NAWI) Directive.

Our scope as a notified body under the European Commission (EC) Directive 90/384/EEC for NAWI includes the conformity assessment modules for the instrument types in the MID.

All the facilities below are available for research or pre-compliance testing. All test facilities are fully traceable to national standards and operated in accordance with the International Standards Organisation (ISO) 17025 as accredited by United Kingdom Accreditation Service (UKAS). See our scope of UKAS accredited testing services for more details.

For more information on booking our facilities please use the online application form

Pre-assessment testing

NMO can provide pre-assessment testing for pre-production modules. Pre-production models are submitted for testing to give manufacturers confidence in their products’ ability to pass EMC immunity testing.

Anechoic chamber

NMO can conduct electromagnetic compatibility (EMC) testing for International Organisation of Legal Metrology (OIML) recommendations. In order for electronic products placed on the European market, they must meet the essential requirements set out in the EMC Directive 2004/108/EC. The chamber’s dimensions are approximately 3 x 3 x 3 metres and can generate a frequency of 26 MHz to 2 GHz up to 10 volts per meter. Equipment being tested is subjected to RFI tests complying with the IEC 61000-4.3 standard.

Environmental chambers

NMO operates two environmental test chambers including one of the largest walk-in environmental test chambers (4 m long, 3 m wide and 2.5 m high), allowing temperature testing from -25ºC to 70ºC and humidity testing up to 95% relative humidity to be achieved quickly and cost-effectively. We can perform static temperature testing to International Electrotechnical Commission (IEC) 60068-2-1 and IEC 60068-2-2, and damp heat steady state testing to IEC 60068-2-78 and IEC 60068-2-30.

Electrical test laboratories

NMO can conduct EMC testing for OIML recommendations, IEC requirements and other manufacturers specific requirements. In order for electronic products to be placed on the European market, they must meet the essential requirements set out in the EMC Directive 2004/108/EC. Burst, surge, voltage variations, dips, interruptions and conductive testing is in accordance with IEC 61000 immunity series.

Other testing capabilities include metrological testing of measuring instruments including petrol pumps, NAWI, and automatic weighing instruments (AWI). Vehicle mounted measuring equipment is also tested (automotive testing) to ISO 7637.

Dead weight force loading rig

NMO has a deadweight machine for testing load cells in accordance with OIML R60 offering a capacity of 100 kg to 1000 kg. The environment of the chamber in which the load cell is placed can be adjusted from -20°C to 50°C. Load cells are tested at -10°C, 20°C and 40°C to ensure the temperature compensation design and construction is working within limits set by OIML R60. We can offer load cell manufacturers this testing facility to assist their development of prototype products and a method of checking against theoretical modelling programs.

For further details then please contact:

Head of Technical Services

Mannie Panesar
Office for Product Safety and Standards
Stanton Avenue

TW11 0JZ

Published 14 April 2014