SJ 20524-1995 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| SJ 20524-1995 | English | 150 |
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Measuring methods of shielding effectiveness of materials
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SJ 20524-1995: Measuring methods of shielding effectiveness of materials---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/SJ20524-1995
SJ
ELECTRONIC INDUSTRY STANDARD
FL 3971
Measuring methods
for shielding effectiveness of materials
Issued on. MAY 25, 1995
Implemented on. DECEMBER 01, 1995
Issued by.
Ministry of Electronic Industry of the People’s Republic of
China
Table of Contents
1 Scope... 3
2 Reference files... 3
3 Definitions... 3
4 General requirements... 4
5 Detailed requirements... 6
Recommended method to measure near-field shielding effectiveness of
conductive wire, conductive film, conductive rubber and other flat-plate type
materials... 12
Other methods to measure near-field shielding effectiveness of conductive wire,
conductive film, conductive rubber and other flat-plate type materials... 14
Additional information... 16
Measuring methods
for shielding effectiveness of materials
1 Scope
1.1 Subject content
This standard specifies the measuring methods of flat-plate type electromagnetic
shielding material, such as non-conductive material coating or plating-layer, metal mesh,
conductive film, conductive glass, and conductive dielectric plate against plane wave
shielding effectiveness.
1.2 Applicable scope
This standard is applicable for measurement of flat-plate type electromagnetic shielding
materials, such as metal film, non-conductive material coating or plating-layer, metal mesh,
conductive film, and conductive glass, and conductive dielectric plate against plane wave
shielding effectiveness.
2 Reference files
GB 6113-85 Electromagnetic Interference Measuring Instrument
GJB 72-85 Terminology of Electromagnetic Interference and Electromagnetic
Compatibility
GJB/Z 25-90 Design Guideline on Earthing, Lapping and Shielding of Electronic
Equipment and Facility
3 Definitions
Except for terms specified in this standard, other terms shall comply with GJB 72.
3.1 Shielding effectiveness (SE)
Under the same excitation level, the ratio of power or voltage received when there is or
there is not shielding materials; it is expressed in logarithm. That is.
4 General requirements
4.1 Measurement condition
4.2 Test equipment
4.2.4 Tracking signal source/spectrum analyzer
Frequency range. 1 MHz ~ 1.5 GHz;
4.2.7 Cable and connector
Characteristic impedance. 50 Ω;
5.1 Measurement requirements Electric field Magnetic field
a. The maximum thickness of load sample t 5mm, outer diameter of the sample ≦ is
, hole diameter of the sample is. The tested material shall be
made into sample according to the following specifications (see figure 3);
a1 load sample a2 load sample a3 reference sample
a1.The load sample that can be used in shielding effectiveness test of 5kHz to 1.5
GHz. However, the comparability of k5Hz to 30MHz and ASTM double shielding
box method remains to be further researched;
5.2 Measurement methods
When the flange coaxial testing device is used to measure shielding effectiveness of
materials, the common measurement methods are. signal source/electromagnetic
interference measuring instrument (interference receiver) measurement, tracking signal
source/spectrum analyzer measurement, and network analyzer measurement.
5.2.2 Tracking signal source/spectrum analyzer measurement
a. Connect the measurement device according to figure 5, directly connect the output end
of tracking signal source/spectrum analyzer which meets requirements of 4.2.4 in this
standard to one end of this device through 10dB attenuator, and the other end of this
5.3 For three measurement methods provided above, it shall be subject to the method in
5.2.1 if a dispute arises.
SJ 20524-1995
SJ
ELECTRONIC INDUSTRY STANDARD
FL 3971
Measuring methods
for shielding effectiveness of materials
Issued on. MAY 25, 1995
Implemented on. DECEMBER 01, 1995
Issued by.
Ministry of Electronic Industry of the People’s Republic of
China
Table of Contents
1 Scope... 3
2 Reference files... 3
3 Definitions... 3
4 General requirements... 4
5 Detailed requirements... 6
Recommended method to measure near-field shielding effectiveness of
conductive wire, conductive film, conductive rubber and other flat-plate type
materials... 12
Other methods to measure near-field shielding effectiveness of conductive wire,
conductive film, conductive rubber and other flat-plate type materials... 14
Additional information... 16
Measuring methods
for shielding effectiveness of materials
1 Scope
1.1 Subject content
This standard specifies the measuring methods of flat-plate type electromagnetic
shielding material, such as non-conductive material coating or plating-layer, metal mesh,
conductive film, conductive glass, and conductive dielectric plate against plane wave
shielding effectiveness.
1.2 Applicable scope
This standard is applicable for measurement of flat-plate type electromagnetic shielding
materials, such as metal film, non-conductive material coating or plating-layer, metal mesh,
conductive film, and conductive glass, and conductive dielectric plate against plane wave
shielding effectiveness.
2 Reference files
GB 6113-85 Electromagnetic Interference Measuring Instrument
GJB 72-85 Terminology of Electromagnetic Interference and Electromagnetic
Compatibility
GJB/Z 25-90 Design Guideline on Earthing, Lapping and Shielding of Electronic
Equipment and Facility
3 Definitions
Except for terms specified in this standard, other terms shall comply with GJB 72.
3.1 Shielding effectiveness (SE)
Under the same excitation level, the ratio of power or voltage received when there is or
there is not shielding materials; it is expressed in logarithm. That is.
4 General requirements
4.1 Measurement condition
4.2 Test equipment
4.2.4 Tracking signal source/spectrum analyzer
Frequency range. 1 MHz ~ 1.5 GHz;
4.2.7 Cable and connector
Characteristic impedance. 50 Ω;
5.1 Measurement requirements Electric field Magnetic field
a. The maximum thickness of load sample t 5mm, outer diameter of the sample ≦ is
, hole diameter of the sample is. The tested material shall be
made into sample according to the following specifications (see figure 3);
a1 load sample a2 load sample a3 reference sample
a1.The load sample that can be used in shielding effectiveness test of 5kHz to 1.5
GHz. However, the comparability of k5Hz to 30MHz and ASTM double shielding
box method remains to be further researched;
5.2 Measurement methods
When the flange coaxial testing device is used to measure shielding effectiveness of
materials, the common measurement methods are. signal source/electromagnetic
interference measuring instrument (interference receiver) measurement, tracking signal
source/spectrum analyzer measurement, and network analyzer measurement.
5.2.2 Tracking signal source/spectrum analyzer measurement
a. Connect the measurement device according to figure 5, directly connect the output end
of tracking signal source/spectrum analyzer which meets requirements of 4.2.4 in this
standard to one end of this device through 10dB attenuator, and the other end of this
5.3 For three measurement methods provided above, it shall be subject to the method in
5.2.1 if a dispute arises.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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