GB/T 40675.3-2021Noise suppression sheet for digital devices and equipment - Part 3: Characterization of parameters of noise suppression sheet (English PDF)

1 Scope

This document gives the parameters of electromagnetic noise suppression sheet (NSS) for digital devices and equipment with frequencies between 30MHz and 30GHz feature: This document also provides guidelines for the description of noise suppression sheet performance in the manufacturer's technical data: NSS is the suppression at the noise source noise, rather than absorbing it at a distance: Therefore NSS differs from RF absorbers used in free space:

The values given in this document are typical parameter (attribute) values associated with NSS: The performance values for a particular device are not easy or even impossible to predict:

Therefore, the purpose of the NSS test is to evaluate the rating against the material:

Each detailed material and NSS specification should be mutually agreed between the user and the manufacturer:

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document:

GB/T 1033:1-2008 Determination of the density of non-foamed plastics - Part 1: Impregnation method, pycnometer method and titration method (ISO 1183-1:2004, IDT)

GB/T 2421-2020 Environmental Testing Overview and Guidelines (IEC 60068-1:20131), IDT)

1) IEC 60068-1:1988 has been replaced by IEC 60068-1:2013, and the contents quoted in the text still apply:

ISO 527-1 Determination of tensile properties of plastics - Part 1: General properties-Part 1:Generalprinciples)

Note: GB/T 1040:1-2018 Determination of Tensile Properties of Plastics Part 1: General (ISO 527-1:2012, IDT)

ISO 3611 Product Geometric Specification (GPS) Design and metrological characteristics of micrometers for external measurement of dimensional measuring equipment [Ge- ometricalproductspecifications(GPS)-Dimensionalmeasuringequipment:Micrometersforexternal measurements-Designandmetrologicalcharacteristics]

ISO 22007-1 Determination of thermal conductivity and thermal diffusivity of plastics - Part 1: General thermalconductivityandthermaldiffusivity-Part 1:Generalprinciples)

ISO 22007-2 Determination of thermal conductivity and thermal diffusivity of plastics - Part 2: Transient planar heat source (hot plate) method

[Plastics-Determinationofthermalconductivityandthermaldiffusivity-Part 2:Transientplane heatsource(HotDisc) method]

ISO 22007-3 Determination of thermal conductivity and thermal diffusivity of plastics - Part 3: Method of temperature wave analysis (Plastics-Deter- minationofthermalconductivityandthermaldiffusivity-Part 3:Temperaturewaveanalysismethod)

ISO 22007-4 Determination of thermal conductivity and thermal diffusivity of plastics - Part 4: Laser flash method (Plastics-Determi- nationofthermalconductivityandthermaldiffusivity-Part 4:Laserflashmethod)

IEC 60068-2-1 Environmental Testing Part 2-1: Test Test A: Low Temperature (Environmental testing-Part 2-1:

Tests-TestA:Cold)

Note: GB/T 2423:1-2008 Environmental Testing of Electrical and Electronic Products Part 2: Test Method Test A: Low Temperature (IEC 60068-2-1:2007, IDT)

GB/Z 40842 | GB/T 36103.1 | SJ/T 10410 | GB/T 47515 | GB/T 44069.13 | GB/T 40675.2 | […]