SJ 20819-2002 General specification for military EMI absorbing components (including magnetic beads, magnetic rings, magnetic cylinders, magnetic clamps, etc.)
Some standard content:
Military Standard of the Electronic Industry of the People's Republic of China FL0122 Military EMI Absorbers SJ20819--2002 (including magnetic beads, magnetic rings, magnetic cylinders, magnetic clamps and other components) General Specification General Specification for Military EMI absorbers (ferrite bead, ferrite core, ferrite barrel, ferrite saddle etc) Issued on June 15, 2002 Implementation on October 1, 2002 Approved by the Ministry of Information Industry of the People's Republic of China 1 Scope 1.1 Subject matter 1.2 Scope of application 1.4 Model naming 2 Reference documents 3 Requirements 3.1 Related detailed specifications 3.2 Qualification appraisal 3.3 Material properties 3.4 Dimensions 3.5 Impedance frequency characteristics 3.6 Environment 3.7 Other properties 3.8 Product marking Appearance quality 3.8 Quality assurance regulations |4.1 Inspection responsibility
Inspection classification
Inspection conditions
Identification inspection
Quality consistency inspection
Packaging inspection
Inspection method
Delivery preparation
5.1 Packaging
5.2 Packing
5.3 Transportation and storage
5.4 Marking
6 Notes,
6.1 Intended use
6.2 Contents of order documents
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General specification for military EMI absorbers (including magnetic beads, magnetic rings, magnetic tubes, magnetic clamps, etc.) of the People's Republic of China's electronic industry
General This specification specifies the general requirements, quality assurance, maintenance and delivery preparation for various military EMI absorbing components (including magnetic beads, magnetic rings, magnetic cylinders, magnetic plates and other components) (hereinafter referred to as absorbing components).
1.2 Scope of application
This specification applies to iron
t.3 Classification
Oxygen therapy
Series provisions
Absorbing elements can be divided into Nizh250 according to material type
According to shape, they can be divided into magnetic beads, magnetic rings (H)
According to structure, they can be divided into whole parts
1.4 Model naming
The model naming adopts the following engraved form
The code of the absorbing element.
Structural code
ZNiZn250%H
2 Reference documents
Research and production of parts
ANESOGNT
Starting magnetic permeability. Shape code and size
Material code,
NEORMA
Net 2#65×6
Starting magnetic permeability 250
Integral
Absorbing element
GB191--2000 Pictorial symbol for packaging, storage and transportation
GB/2421-1999 Environmental testing for electrical and electronic products Approved by the Ministry of Information Industry of the People's Republic of China on 2002-06-15 Implemented on 2002-10-01
SJ20819--2002
Environmental test methods for military equipment
GJB150.3 —86
GJB150.4-86 Military equipment environmental test methods High temperature test
Low temperature test
GJB150.5—-86 Military equipment environmental test methods Temperature shock test GJB150.9—86 Military equipment environmental test methods Wet heat test Military equipment environmental test methods
Salt spray test
GJB150.11-86
GJB179A--96 Counting sampling inspection procedures and table 3 requirements
3.1 Related detailed specifications
The individual requirements of the absorbing element shall comply with the requirements of the relevant detailed specifications. If the requirements of this specification conflict with the requirements of the relevant detailed specifications, the relevant detailed specifications shall prevail.
3.2 Qualification appraisal
The products submitted in accordance with this specification shall be qualified and approved by the appraisal. 3.3 Material properties
The main performance indicators of the material shall comply with the requirements of Table 1. Table 1 Material properties
NiZn250
NiZn850
MnZn2500
3.4 Size
Starting ether conductivity
(250±25)%
(850±25)%
(2500±25)%
Saturation magnetic induction
(220±25)%
(275±25)%
(400±25)%
Coercive force
He/(A/m)
(112±25)%
(25±25)%|| tt||(15±25）%wwW.bzxz.Net
Dwelling temperature
≥>240
≥160
Specific loss factor
(tg81μ)/xt06
100(2.5MHz)
F20（IMHz）
7(0.1MHz）
Applicable frequency band
>200MHz
30MHz~2GHz
10kHz~3MHz
The size of the absorbing element shall comply with the provisions of the relevant detailed specifications. Where the size specified in the detailed specifications involves relevant standards, the standard number shall be indicated.
3.5 Impedance frequency characteristics
The impedance frequency characteristics of the absorbing element shall be specified in the relevant detailed specifications. 3.6 Environment
3.6.1 Low temperature
The absorbing element shall be able to work normally, be stored and transported under the low temperature conditions specified in Table 2. After the low temperature storage test is carried out according to GJB150.4, its impedance frequency characteristics shall meet the provisions of Article 3.5: There shall be no cracks, peeling, blistering, etc. on the surface.
Table 2 Temperature
Working temperature
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Storage and transportation temperature
3.6.2 High temperature
SJ20819—2002
The absorbing element shall be able to work normally, be stored and transported under the high temperature conditions specified in Table 2. After the high temperature storage test is carried out according to GJB150.3, its impedance frequency characteristics shall meet the provisions of Article 3.5: There shall be no cracks, peeling, blistering, etc. on the surface. 3.6.3 Temperature shock
After the absorbing element is subjected to the temperature shock test according to the test conditions specified in Table 3, its impedance frequency characteristics shall meet the requirements of Article 3.5; there shall be no cracking, peeling, blistering, etc. on the surface. Table 3 Temperature shock test conditions
Number of cycles
3.6.4 Damp heat
25±10
25±10
After the absorbing element is subjected to the damp heat test according to the test conditions specified in Table 4, its impedance frequency characteristics shall meet the requirements of Article 3.5; there shall be no cracking, peeling, blistering, etc. on the surface. Table 4 Humidity test conditions
Test cycle
3.6.5 Salt spray
High temperature and high humidity
Low temperature and high humidity
30 to 60
60 to 30
Relative condensation
After the absorbing element is subjected to the salt spray test according to the test conditions specified in Table 5, its impedance frequency characteristics shall meet the requirements of Article 3.5; there shall be no cracking, peeling, blistering and other phenomena on the surface. Table 5 Salt spray test conditions
3.7 Other properties
Should meet the relevant detailed specifications.
3.8 Product logo
The following logos should be appropriately selected:
Salt spray deposition film
ml/(cm2.h)
(1~2)/80
Spraying method
Test time
Model and specification of absorbing element:
Production batch number:
Trademark.
The mark should be complete, clear and firm.
SJ20819-2002
3.9 Appearance quality
3.9.1 The surface roughness of the surface, especially the split contact surface, should be less than that of the 3.9.2 contact surface and the edge of the contact surface, and the total area of the gap should not exceed the following provisions: small (such as magnetic beads 4mm×1.4mm×1.6mm) absorbing elements such as magnetic beads and magnetic rings: 5% of the contact area; a.
Magnetic clamps, magnetic cylinders and other slightly larger (such as magnetic cylinders Φ18mm×9.5mm×28mm) absorbing elements: 2% of the contact area b.
Other parts are allowed to have a certain degree of gaps, and the specific requirements should be specified in the detailed specifications. 3.9.3 There should be no obvious cracks, pores, hole sources and other defects that affect the main performance. For smaller cracks, pores and pores, as long as they do not affect the main performance and do not cause other parameters to exceed the tolerance, they are allowed to exist, and the specific requirements should be specified in the detailed specifications. 3.9.4 The corners should be smooth and there should be no obvious burrs. 4 Quality Assurance Provisions
4.1 Inspection Responsibility
Unless otherwise specified in the contract or order, the contractor shall be responsible for completing all inspections specified in this specification. If necessary, the ordering party or the superior appraisal agency has the right to inspect any inspection described in this specification. 4.1.1 Qualification Responsibility
All absorbers must comply with all requirements of Chapter 3 and Chapter 5 of this specification. The inspection content specified in this specification shall become an integral part of the contractor's entire inspection system or quality outline. If the contract includes inspection requirements not specified in this specification. The contractor shall also ensure that the products submitted for acceptance meet the contract requirements. Quality consistency sampling does not allow the submission of products that are known to be defective, nor can the ordering party be required to accept defective products.
4.2 Inspection Classification
The inspections specified in this specification are divided into:
a. Signature inspection;
b. Quality consistency inspection.
4.3 Test conditions
Unless otherwise specified, the test should be carried out under the following standard atmospheric conditions: Temperature: 15℃~35℃;
Relative humidity: 20%80%:
Air pressure: the air pressure of the test site.
When there is any objection to a certain parameter, the test should be carried out under the following standard atmospheric conditions of the secondary load test: Temperature: 23℃±2℃
Relative humidity: (50±5)%:
Air pressure: 86kPa106kPa.
4.4 Identification and inspection
Identification and inspection must be carried out when the absorbing element is designed and produced. Identification and inspection should be carried out in a laboratory approved by the superior identification agency. The samples used should be products produced by commonly used equipment and processes.
4.4.1 Inspection items and sequence
SJ20819—2002
The items and sequence of the appraisal inspection shall be carried out in accordance with the provisions of Table 6. Table 6 Appraisal inspection
Inspection items
Product mark
Appearance quality
Impedance frequency characteristics
Material properties
Temperature shock
Humidity condensation heat
4.4.2 Inspection samples
Requirements Article number
Inspection method Article number
1a.g.4.7.bo
Sample size
30473457
Sample size for appraisal inspection, acceptance judgment
4.4.3 Qualification judgment
Inspect according to Table 6. All items of the product rise ratio meet the requirements of Chapter 3. Qualified report.
4.4.4 Failure
When the following
qualifications are found in the appraisal and inspection, the following methods shall be followed:
When the product mark appears in the appraisal and inspection, and the appearance quality is unqualified, the appraisal and inspection shall be stopped. After the contractor's review or rejection, a.
the inspection shall be repeated:
b. When the product is almost unqualified in the appraisal and inspection, the appraisal and inspection shall be stopped to find out the reasons and submit an analysis report. The contractor may only repeat the inspection after taking corrective measures. C. When the impedance frequency characteristics, material properties, and environmental adaptability are unqualified in the appraisal and inspection, the appraisal and inspection shall be stopped, the reasons shall be found out, and an analysis report shall be submitted. After the contractor takes corrective measures, the appraisal and inspection shall be repeated. 4.4.5 Maintenance of qualification
The contractor shall provide relevant test data regularly to prove the validity of its product qualification. 4.5 Quality consistency inspection
4.5.1 Inspection items
The quality consistency inspection items and sequence shall be carried out in accordance with Table 7. New York
SJ20819—2002
Table 7 Quality Consistency Inspection
Inspection Items
Product Mark
Appearance Quality
Impedance Frequency Characteristics
Temperature Shock
4.5.2 Inspection Samples and Qualification Judgment
4.5.2.1 Group A Inspection
Requirements Article No.
Inspection Method Article No.
Each batch of absorbers submitted by the contractor shall be subject to Group A inspection. The test samples shall be randomly selected from the absorbers submitted for inspection. The sampling plan shall be determined in accordance with GJB179A and the following provisions. Inspection Level: Generally, general inspection level I is adopted: Special inspection level S-2a.
b, and the acceptable quality level AQL value is 2.5:c. One-time sampling is adopted.
4.5.2.2 Group B Inspection
Each batch of absorbers submitted by the contractor shall be subject to Group B inspection. The test samples shall be randomly selected from the batches that have passed the Group A inspection. The sampling party shall determine the sampling according to GJB179A and the following provisions. The inspection level generally adopts the general inspection level II: Special inspection level S-2a may also be adopted.
b. The acceptable quality level AQL value is 1.0: c. One-time sampling is adopted.
4.5.2.3 Group C Inspection
After formal production, if there are major changes in design, process, and materials that may affect the performance of absorbers, Group C inspection shall be carried out: When the user requires Group C inspection, Group C inspection shall also be carried out. The test samples shall be randomly selected from the batches that have passed the Group A and Group B inspections. The sampling plan is: n=2A=0R=1.4.5.3 Unqualified
4.5.3.1 In the A group inspection, if the number of defects is greater than the acceptance judgment number, the inspection shall be stopped, and the contractor shall repair or reject the submitted batch before re-inspection. 4.5.3.2 In the B inspection, if the number of defects is greater than the acceptance judgment number, the batch of absorbers is unqualified, and the inspection shall be stopped. The contractor shall take measures to solve the quality problems before re-inspection. 4.5.3.3 In the C group inspection, the same as 4.5.3.2. 4.6 Packaging inspection
The inspection of the packaging box, packaging box, transportation and storage, and marking of the absorber shall be carried out on two packaging boxes randomly selected from each batch. If any item in the inspection does not meet the requirements of Chapter 5, four packaging boxes shall be randomly selected for inspection. If it still does not meet the requirements, the packaging design must be improved until it meets the requirements. 4.7 Inspection method
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4.7.1 Product marking, appearance quality, size, packaging SJ20819—2002
Use visual inspection to inspect appearance, and use measuring tools that meet the accuracy requirements to inspect dimensions, so as to verify whether its marking, appearance quality, size, packaging, etc. meet the requirements.
4.7.2 Material properties
4.7.2.1 General
4.7.2.1.1 Standard sample ring
Standard sample rings (hereinafter referred to as standard samples) shall be used for testing of material properties. 4.7.2.1.2 Dimensions of Standard Samples
The shape of the standard sample is a toroidal magnetic core, and its structure and dimensions are shown in Figure 1: Unit: mm
-9.6±0.3
,=16±0.5
Figure 1 Standard Sample Structure Diagram
4.7.2.1.3 Treatment of Standard Samples
The standard sample must be treated with the following methods to eliminate moisture, heat, mechanical and electromagnetic influences before testing. h-4.8+0.15
a. When the standard sample is affected by mechanical stress, the standard sample should be chemically treated or heat treated before testing to eliminate stress; b. When the standard sample is affected by electromagnetics, the standard sample should be AC demagnetized before testing: c. When the standard sample and the test coil absorb moisture, they should be dried at 80℃～90℃ for at least 2h to eliminate moisture; d.The standard samples that have been heat treated or affected by heat should be placed under the normal test atmosphere conditions specified in GB/T2421 for at least 48 hours before measurement;
4.7.2.1.4 Test coil
There should be good insulation between the test coil and the standard sample (the standard sample should be wrapped with 1 to 2 layers of capacitor paper). The wire of the test coil should be a high-strength enameled wire with a wire diameter of 0.31mm.
4.7.2.2 Initial magnetic permeability
Initial magnetic permeability! The test is carried out by the winding method and should comply with the following provisions: a.
The coil is a single-layer uniformly distributed coil with a coil turn number N=20: Test frequency f=0.1MHz, MHz, 2.5MHz, etc.: μ, calculated by formula (1).
4.6hig（/中）
SJ208192002
The inductance value indicated by the instrument during the test, H:
Where: L
N Line graph number:
H Standard sample height, cm;
中, Standard sample outer diameter, cm
pz Standard sample inner diameter, cm.
4.7.2.3 Saturation magnetic induction intensity B
Saturation magnetic induction intensity B should be tested by electronic integration method under saturation magnetic field. 4.7.2.4 Curie temperature T.
The Curie temperature of the test sample decreases to 80% of the u value at room temperature (20℃) as the temperature increases, and the corresponding temperature value. 4.7.2.5 Specific loss coefficient tg6/μ
Specific loss coefficient g8/ui is calculated by testing loss tangent gS and initial magnetic permeability μ. The test of specific loss coefficient is carried out by winding method and shall comply with the following provisions. The coil is a single-layer uniformly distributed coil with N=20 turns and a wire diameter of 0.31mm; the test frequency is f=0.1MHz, 1MHz, 2.5MHz, etc.: Loss tangent g6 is calculated by formula (2):
Where: Rm--the equivalent resistance of the sample loss; w=2f angular frequency, rad/s:
tg8=Rm/0L
L--the inductance indicated by the instrument during the test, H; initial magnetic permeability μ; the test is shown in 4.7.2.2; specific loss coefficient = tg6/
4.7.3 Impedance frequency characteristics
Tested with an impedance analyzer.
4.7.4 Low temperature test
The low temperature test shall be carried out in accordance with GJB150.4. The test conditions shall be in accordance with 3.6.1. After the test, the sample shall be placed at room temperature for 2 hours, and then the surface shall be inspected. After 16 hours, the impedance frequency characteristics shall be tested. 4.7.5 High temperature test
It shall be carried out in accordance with GJB150.3. The high temperature test conditions shall be in accordance with 3.6.2. After the test, the sample shall be placed at room temperature for 2 hours, and then the surface shall be inspected. After 16 hours, the impedance frequency characteristics shall be tested. 4.7.6 Temperature shock test
It shall be carried out in accordance with GJB150.5. The temperature shock test conditions shall be in accordance with 3.6.3. After the test, the sample shall be placed at room temperature for 2 hours, and then the surface shall be inspected. After 16 hours, the impedance frequency characteristics shall be tested. 4.7.7 Humidity test
Should be carried out in accordance with GJB150.9, and the humidity test conditions should be in accordance with 3.6.4. After the test, the sample should be placed at room temperature for 2 hours, and then the surface should be checked. After 16 hours, the impedance frequency characteristics should be tested. 4.7.8 Salt spray test
Salt spray test should be carried out in accordance with GJB150.11, and the test conditions should be in accordance with 3.6.5. After the test, the sample should be placed at room temperature for 2 hours, and then the surface should be checked. After 16 hours, the impedance frequency characteristics should be tested. 8
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5 Delivery preparation
5.1 Packaging
SJ20819--2002
The absorbing element should be packaged in a packaging box. Each packaging box can only contain absorbing elements of the same model and specification; each absorbing element should be isolated by soft packaging materials such as polyester foam. 5.2 Packing
The packing box should be firm, reliable and moisture-proof. The gaps in the packing box should be filled with soft packing materials. The packing box should contain the certificate of conformity, instruction manual and packing list. 5.3 Transportation and storage
5.3.1 Transportation
The packing box containing the absorbing element should be able to be transported by any means of transportation. During transportation, direct rain and snow and mechanical collision should be avoided. 5.3.2 Storage
The absorbing element should be stored indoors. The storage environment should be free of acidic, alkaline or other harmful gases, and should be ventilated and dry. 5.4 Marking
5.4.1 The absorbing element packaging box should be marked with: the name of the absorbing element, model specifications, trademark, packaging date, name of the manufacturer, etc. 5.4.2 The marking on the packaging box should meet the following requirements: a. The packaging box should be marked with: the name, model specification, quantity, weight, production batch number, trademark, name of the manufacturing unit, manufacturing date, etc. of the absorbing element:
b. The packaging box should be marked with "easy to formaldehyde items", "rainproof" and other signs, and the signs should comply with GB191: the signs should not change color or fall off due to natural conditions and transportation conditions; c.
Unless otherwise specified in the contract, all text on the packaging box, except numbers and models, should generally be Chinese characters; d.
The signs should be at two mutually perpendicular positions on the packaging box and should be on the same horizontal line. e.
6 Notes
6.1 Intended use
The absorbing elements specified in this specification are intended for military computers and other electronic equipment. They are mainly used to suppress noise and spike interference on signal lines and power lines, absorb electrostatic discharge, so that the system or subsystem meets the requirements of electromagnetic compatibility and anti-electromagnetic information leakage. 6.2 Contents of order documents
The following contents shall be stated in the contract or order form: a. Name and number of this specification:
b. Name and number of relevant detailed specifications: C. Special requirements such as packaging, transportation, etc.: d. Quantity, etc.
Additional remarks:
This specification is under the jurisdiction of the Fourth Institute of Electronics of the Ministry of Information Industry. This specification was drafted by the 23rd Institute of Electronics of the Ministry of Information Industry. The main drafters of this specification: Ma Fuhua, Pei Enqin, Yang Dongzhu, Chen Longhui, Wang Qing. Project code: B88001.
iKAoNiKAca=
People's Republic of China
Military Standards for Electronics Industry
General Specifications for Military EMI Absorbing Components
(Including Magnetic Beads, Magnetic Rings, Magnetic Cylinders, Magnetic Clamps, etc.)
SJ20819--2002
China Electronics Technology Standardization Institute
Published by
Printed by
China Electronics Technology Standardization Institute
Published by
China Electronics Technology Standardization Institute Institute
Tel: (010) 84029065Fax: (010) 64007812Address: No. 1 Dongren Street, Andingmen, Beijing
Number: 100007
Website: cesi.ac.cn
Format: 880×12301/16Printing Sheet:
Word Count: 22Hand Study
First Edition: April 2002, First Printing in April 2002. Copyright Exclusive. Reproduction is Prohibited
Report Telephone: (010) 640078045 Specific loss coefficient tg6/μ
Specific loss coefficient g8/ui is calculated by testing loss tangent gS and initial magnetic permeability μ. The test of specific loss coefficient is carried out by winding method and shall comply with the following provisions. The coil is a single-layer uniformly distributed coil with N=20 turns and a wire diameter of 0.31mm; the test frequency is f=0.1MHz, 1MHz, 2.5MHz, etc.: Loss tangent g6 is calculated by formula (2):
Where: Rm--sample loss equivalent resistance; w=2f angular frequency, rad/s:
tg8=Rm/0L
L--inductance value indicated by the instrument during the test, H; initial magnetic permeability μ; see 4.7.2.2 for the test; specific loss coefficient = tg6/
4.7.3 Impedance frequency characteristics
Tested with an impedance analyzer.
4.7.4 Low temperature test
The low temperature test shall be carried out in accordance with GJB150.4. The test conditions shall be in accordance with 3.6.1. After the test, the sample shall be placed at room temperature for 2 hours, and then the surface shall be inspected. After 16 hours, the impedance frequency characteristics shall be tested. 4.7.5 High temperature test
It shall be carried out in accordance with GJB150.3. The high temperature test conditions shall be in accordance with 3.6.2. After the test, the sample shall be placed at room temperature for 2 hours, and then the surface shall be inspected. After 16 hours, the impedance frequency characteristics shall be tested. 4.7.6 Temperature shock test
It shall be carried out in accordance with GJB150.5. The temperature shock test conditions shall be in accordance with 3.6.3. After the test, the sample shall be placed at room temperature for 2 hours, and then the surface shall be inspected. After 16 hours, the impedance frequency characteristics shall be tested. 4.7.7 Humidity test
Should be carried out in accordance with GJB150.9, and the humidity test conditions should be in accordance with 3.6.4. After the test, the sample should be placed at room temperature for 2 hours, and then the surface should be checked. After 16 hours, the impedance frequency characteristics should be tested. 4.7.8 Salt spray test
Salt spray test should be carried out in accordance with GJB150.11, and the test conditions should be in accordance with 3.6.5. After the test, the sample should be placed at room temperature for 2 hours, and then the surface should be checked. After 16 hours, the impedance frequency characteristics should be tested. 8
TTKAONTKAca-
5 Delivery preparation
5.1 Packaging
SJ20819--2002
The absorbing element should be packaged in a packaging box. Each packaging box can only contain absorbing elements of the same model and specification; each absorbing element should be isolated by soft packaging materials such as polyester foam. 5.2 Packing
The packing box should be firm, reliable and moisture-proof. The gaps in the packing box should be filled with soft packing materials. The packing box should contain the certificate of conformity, instruction manual and packing list. 5.3 Transportation and storage
5.3.1 Transportation
The packing box containing the absorbing element should be able to be transported by any means of transportation. During transportation, direct rain and snow and mechanical collision should be avoided. 5.3.2 Storage
The absorbing element should be stored indoors. The storage environment should be free of acidic, alkaline or other harmful gases, and should be ventilated and dry. 5.4 Marking
5.4.1 The absorbing element packaging box should be marked with: the name of the absorbing element, model specifications, trademark, packaging date, name of the manufacturer, etc. 5.4.2 The marking on the packaging box should meet the following requirements: a. The packaging box should be marked with: the name, model specification, quantity, weight, production batch number, trademark, name of the manufacturing unit, manufacturing date, etc. of the absorbing element:
b. The packaging box should be marked with "easy to formaldehyde items", "rainproof" and other signs, and the signs should comply with GB191: the signs should not change color or fall off due to natural conditions and transportation conditions; c.
Unless otherwise specified in the contract, all text on the packaging box, except numbers and models, should generally be Chinese characters; d.
The signs should be at two mutually perpendicular positions on the packaging box and should be on the same horizontal line. e.
6 Notes
6.1 Intended use
The absorbing elements specified in this specification are intended for military computers and other electronic equipment. They are mainly used to suppress noise and spike interference on signal lines and power lines, absorb electrostatic discharge, so that the system or subsystem meets the requirements of electromagnetic compatibility and anti-electromagnetic information leakage. 6.2 Contents of order documents
The following contents shall be stated in the contract or order form: a. Name and number of this specification:
b. Name and number of relevant detailed specifications: C. Special requirements such as packaging, transportation, etc.: d. Quantity, etc.
Additional remarks:
This specification is under the jurisdiction of the Fourth Institute of Electronics of the Ministry of Information Industry. This specification was drafted by the 23rd Institute of Electronics of the Ministry of Information Industry. The main drafters of this specification: Ma Fuhua, Pei Enqin, Yang Dongzhu, Chen Longhui, Wang Qing. Project code: B88001.
iKAoNiKAca=
People's Republic of China
Military Standards for Electronics Industry
General Specifications for Military EMI Absorbing Components
(Including Magnetic Beads, Magnetic Rings, Magnetic Cylinders, Magnetic Clamps, etc.)
SJ20819--2002
China Electronics Technology Standardization Institute
Published by
Printed by
China Electronics Technology Standardization Institute
Published by
China Electronics Technology Standardization Institute Institute
Tel: (010) 84029065Fax: (010) 64007812Address: No. 1 Dongren Street, Andingmen, Beijing
Number: 100007
Website: cesi.ac.cn
Format: 880×12301/16Printing Sheet:
Word Count: 22Hand Study
First Edition: April 2002, First Printing in April 2002. Copyright Exclusive. Reproduction is Prohibited
Report Telephone: (010) 640078045 Specific loss coefficient tg6/μ
Specific loss coefficient g8/ui is calculated by testing loss tangent gS and initial magnetic permeability μ. The test of specific loss coefficient is carried out by winding method and shall comply with the following provisions. The coil is a single-layer uniformly distributed coil with N=20 turns and a wire diameter of 0.31mm; the test frequency is f=0.1MHz, 1MHz, 2.5MHz, etc.: Loss tangent g6 is calculated by formula (2):
Where: Rm--sample loss equivalent resistance; w=2f angular frequency, rad/s:
tg8=Rm/0L
L--inductance value indicated by the instrument during the test, H; initial magnetic permeability μ; see 4.7.2.2 for the test; specific loss coefficient = tg6/
4.7.3 Impedance frequency characteristics
Tested with an impedance analyzer.
4.7.4 Low temperature test
The low temperature test shall be carried out in accordance with GJB150.4. The test conditions shall be in accordance with 3.6.1. After the test, the sample shall be placed at room temperature for 2 hours, and then the surface shall be inspected. After 16 hours, the impedance frequency characteristics shall be tested. 4.7.5 High temperature test
It shall be carried out in accordance with GJB150.3. The high temperature test conditions shall be in accordance with 3.6.2. After the test, the sample shall be placed at room temperature for 2 hours, and then the surface shall be inspected. After 16 hours, the impedance frequency characteristics shall be tested. 4.7.6 Temperature shock test
It shall be carried out in accordance with GJB150.5. The temperature shock test conditions shall be in accordance with 3.6.3. After the test, the sample shall be placed at room temperature for 2 hours, and then the surface shall be inspected. After 16 hours, the impedance frequency characteristics shall be tested. 4.7.7 Humidity test
Should be carried out in accordance with GJB150.9, and the humidity test conditions should be in accordance with 3.6.4. After the test, the sample should be placed at room temperature for 2 hours, and then the surface should be checked. After 16 hours, the impedance frequency characteristics should be tested. 4.7.8 Salt spray test
Salt spray test should be carried out in accordance with GJB150.11, and the test conditions should be in accordance with 3.6.5. After the test, the sample should be placed at room temperature for 2 hours, and then the surface should be checked. After 16 hours, the impedance frequency characteristics should be tested. 8
TTKAONTKAca-
5 Delivery preparation
5.1 Packaging
SJ20819--2002
The absorbing element should be packaged in a packaging box. Each packaging box can only contain absorbing elements of the same model and specification; each absorbing element should be isolated by soft packaging materials such as polyester foam. 5.2 Packing
The packing box should be firm, reliable and moisture-proof. The gaps in the packing box should be filled with soft packing materials. The packing box should contain the certificate of conformity, instruction manual and packing list. 5.3 Transportation and storage
5.3.1 Transportation
The packing box containing the absorbing element should be able to be transported by any means of transportation. During transportation, direct rain and snow and mechanical collision should be avoided. 5.3.2 Storage
The absorbing element should be stored indoors. The storage environment should be free of acidic, alkaline or other harmful gases, and should be ventilated and dry. 5.4 Marking
5.4.1 The absorbing element packaging box should be marked with: the name of the absorbing element, model specifications, trademark, packaging date, name of the manufacturer, etc. 5.4.2 The marking on the packaging box should meet the following requirements: a. The packaging box should be marked with: the name, model specification, quantity, weight, production batch number, trademark, name of the manufacturing unit, manufacturing date, etc. of the absorbing element:
b. The packaging box should be marked with "easy to formaldehyde items", "rainproof" and other signs, and the signs should comply with GB191: the signs should not change color or fall off due to natural conditions and transportation conditions; c.
Unless otherwise specified in the contract, all text on the packaging box, except numbers and models, should generally be Chinese characters; d.
The signs should be at two mutually perpendicular positions on the packaging box and should be on the same horizontal line. e.
6 Notes
6.1 Intended use
The absorbing elements specified in this specification are intended for military computers and other electronic equipment. They are mainly used to suppress noise and spike interference on signal lines and power lines, absorb electrostatic discharge, so that the system or subsystem meets the requirements of electromagnetic compatibility and anti-electromagnetic information leakage. 6.2 Contents of order documents
The following contents shall be stated in the contract or order form: a. Name and number of this specification:
b. Name and number of relevant detailed specifications: C. Special requirements such as packaging, transportation, etc.: d. Quantity, etc.
Additional remarks:
This specification is under the jurisdiction of the Fourth Institute of Electronics of the Ministry of Information Industry. This specification was drafted by the 23rd Institute of Electronics of the Ministry of Information Industry. The main drafters of this specification: Ma Fuhua, Pei Enqin, Yang Dongzhu, Chen Longhui, Wang Qing. Project code: B88001.
iKAoNiKAca=
People's Republic of China
Military Standards for Electronics Industry
General Specifications for Military EMI Absorbing Components
(Including Magnetic Beads, Magnetic Rings, Magnetic Cylinders, Magnetic Clamps, etc.)
SJ20819--2002
China Electronics Technology Standardization Institute
Published by
Printed by
China Electronics Technology Standardization Institute
Published by
China Electronics Technology Standardization Institute Institute
Tel: (010) 84029065Fax: (010) 64007812Address: No. 1 Dongren Street, Andingmen, Beijing
Number: 100007
Website: cesi.ac.cn
Format: 880×12301/16Printing Sheet:
Word Count: 22Hand Study
First Edition: April 2002, First Printing in April 2002. Copyright Exclusive. Reproduction is Prohibited
Report Telephone: (010) 640078042 Storage
The absorbing element should be stored indoors. The storage environment should be free of acidic, alkaline or other harmful gases, and should be ventilated and dry. 5.4 Marking
5.4.1 The packaging box of the absorbing element should be marked with: the name, model specification, trademark, packaging date, name of the manufacturer, etc. of the absorbing element. 5.4.2 The markings on the packaging box should meet the following requirements: a. The outside of the packaging box should be marked with: the name, model specification, quantity, weight, production batch number, trademark, name of the manufacturer, manufacturing date, etc. of the absorbing element:
b. The outside of the packaging box should be marked with: "Easy to formaldehyde items", "Rainproof" and other signs, and the signs should comply with GB191 regulations: The signs should not change color or fall off due to natural conditions and transportation conditions; c.
Unless otherwise specified in the contract, all words on the packaging box, except numbers and models, should generally be Chinese characters; d.
The signs should be at two mutually perpendicular positions on the packaging box and should be on the same horizontal line. e.
6 Notes
6.1 Intended use
The absorbing elements specified in this specification are intended for military computers and other electronic equipment. They are mainly used to suppress noise and spike interference on signal lines and power lines, absorb electrostatic discharge, so that the system or subsystem meets the requirements of electromagnetic compatibility and electromagnetic information leakage prevention. 6.2 Contents of order documents
The following contents should be stated in the contract or order form: a. The name and number of this specification:
b. The name and number of relevant detailed specifications: C. Special requirements such as packaging, transportation, etc.: d. Quantity, etc.
Additional instructions:
This specification is under the jurisdiction of the Fourth Institute of Electronics of the Ministry of Information Industry. This specification was drafted by the 23rd Institute of Electronics of the Ministry of Information Industry. The main drafters of this specification: Ma Fuhua, Pei Enqin, Yang Dongzhu, Chen Longhui, Wang Qing. Project code: B88001.
iKAoNiKAca=
People's Republic of China
Military Standards for Electronics Industry
General Specifications for Military EMI Absorbing Components
(Including Magnetic Beads, Magnetic Rings, Magnetic Cylinders, Magnetic Clamps, etc.)
SJ20819--2002
China Electronics Technology Standardization Institute
Published by
Printed by
China Electronics Technology Standardization Institute
Published by
China Electronics Technology Standardization Institute Institute
Tel: (010) 84029065Fax: (010) 64007812Address: No. 1 Dongren Street, Andingmen, Beijing
Number: 100007
Website: cesi.ac.cn
Format: 880×12301/16Printing Sheet:
Word Count: 22Hand Study
First Edition: April 2002, First Printing in April 2002. Copyright Exclusive. Reproduction is Prohibited
Report Telephone: (010) 640078042 Storage
The absorbing element should be stored indoors. The storage environment should be free of acidic, alkaline or other harmful gases, and should be ventilated and dry. 5.4 Marking
5.4.1 The packaging box of the absorbing element should be marked with: the name, model specification, trademark, packaging date, name of the manufacturer, etc. of the absorbing element. 5.4.2 The markings on the packaging box should meet the following requirements: a. The outside of the packaging box should be marked with: the name, model specification, quantity, weight, production batch number, trademark, name of the manufacturer, manufacturing date, etc. of the absorbing element:
b. The outside of the packaging box should be marked with: "Easy to formaldehyde items", "Rainproof" and other signs, and the signs should comply with GB191 regulations: The signs should not change color or fall off due to natural conditions and transportation conditions; c.
Unless otherwise specified in the contract, all words on the packaging box, except numbers and models, should generally be Chinese characters; d.
The signs should be at two mutually perpendicular positions on the packaging box and should be on the same horizontal line. e.
6 Notes
6.1 Intended use
The absorbing elements specified in this specification are intended for military computers and other electronic equipment. They are mainly used to suppress noise and spike interference on signal lines and power lines, absorb electrostatic discharge, so that the system or subsystem meets the requirements of electromagnetic compatibility and electromagnetic information leakage prevention. 6.2 Contents of order documents
The following contents should be stated in the contract or order form: a. The name and number of this specification:
b. The name and number of relevant detailed specifications: C. Special requirements such as packaging, transportation, etc.: d. Quantity, etc.
Additional instructions:
This specification is under the jurisdiction of the Fourth Institute of Electronics of the Ministry of Information Industry. This specification was drafted by the 23rd Institute of Electronics of the Ministry of Information Industry. The main drafters of this specification: Ma Fuhua, Pei Enqin, Yang Dongzhu, Chen Longhui, Wang Qing. Project code: B88001.
iKAoNiKAca=
People's Republic of China
Military Standards for Electronics Industry
General Specifications for Military EMI Absorbing Components
(Including Magnetic Beads, Magnetic Rings, Magnetic Cylinders, Magnetic Clamps, etc.)
SJ20819--2002
China Electronics Technology Standardization Institute
Published by
Printed by
China Electronics Technology Standardization Institute
Published by
China Electronics Technology Standardization Institute Institute
Tel: (010) 84029065Fax: (010) 64007812Address: No. 1 Dongren Street, Andingmen, Beijing
Number: 100007
Website: cesi.ac.cn
Format: 880×12301/16Printing Sheet:
Word Count: 22Hand Study
First Edition: April 2002, First Printing in April 2002. Copyright Exclusive. Reproduction is Prohibited
Report Telephone: (010) 64007804
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