SJ 20764-1999 General specification for dielectric filters

This specification specifies the general requirements, quality assurance regulations, test methods and delivery preparation of dielectric filters. This specification is applicable to dielectric filters (hereinafter referred to as filters) in military and aerospace electronic equipment with a frequency range of 300MHz~40MHz. SJ 20764-1999 General Specification for Dielectric Filters SJ20764-1999 Standard download decompression password: www.bzxz.net

Filters, dielectric, general specification ||tt| ... for1999-11-10 Issued
1999-12-01 Implementation
Scope of approval by the Ministry of Information Industry of the People's Republic of China
Referenced documents
3 Requirements
3.1 Detailed specifications
3.2 Qualification appraisal
3.3 Materials
Design and structure
Terminal strength (when applicable)
3.6 Solderability (when applicable)
Resistance to soldering heat (when applicable)
Sealing (when applicable)
Dielectric withstand voltage
Low pressure (filters designed to work above 3000m) Insulation resistance
Electrical properties
Limit temperature stability
High temperature life
Shock (specified pulse)
Temperature Shock
Salt spray (when applicable)
Steady-state acceleration (when applicable)
Solvent resistance (when applicable)
Mold (when applicable)
Processing quality
Quality assurance regulations
Inspection responsibility
Inspection classification
Inspection conditions
4.4 Material inspection
Identification inspection
Quality consistency inspection
Inspection method
Delivery preparation
5.4 Storage
Intended use
Contents of ordering documents
1 Scope
General specification for dielectric filters for the military standard of the People's Republic of China for the electronics industry
Filters, dielectric, general 1.1 Subject content
SJ20764—1999
This specification specifies the general requirements, quality assurance provisions and delivery preparation of dielectric filters. 1.2 Scope of application
This specification applies to dielectric filters (hereinafter referred to as filters) in military and aerospace electronic equipment in the frequency range of 300MHz to 40GHz.
1.3 Classification
1.3.1 Model specification
The model specification shall be in the following form and comply with the provisions (see 3.1). 0000-0-0
Expected life (1.3.1.3)
Maximum operating temperature (1.3.1.2)
Model specification (1.3.1.1)
1.3.1.1 Model
The model of the filter consists of the following four parts: 口口口
Specification, represented by the letters A, B. (M, O) Except for the center frequency of filters with the same center frequency but different structures, sizes and performances, represented by Arabic numerals (unit: MHz) Filter category code, J represents the main name of the dielectric material: L represents the filter
1.3.1.2 Maximum operating temperature
The maximum operating temperature of the filter is represented by a letter, which indicates the maximum operating temperature of the specified expected life, see Table 1.
The Ministry of Information Industry of the People's Republic of China Issued on November 10, 1999 Implemented on December 1, 1999
1.3.1.3 Expected Life
SJ20764—1999
Table 1 Maximum Operating Temperature and Its Code
The expected life of the filter is represented by a letter, see Table 2. Table 2 Expected Life and Its Code
1.3.1.4 Example
Maximum Operating Temperature
100℃
125℃
Expected Life (Minimum)
Filter LJ708A—C—T represents a dielectric filter with a center frequency of 708MHz, specification A, a maximum operating temperature of 70C, and an expected life of 2500h.
2 Reference documents
GB67—85 Round head screws
GB191—90 Pictorial symbols for packaging, storage and transportation
GB193--90 Ordinary thread diameter and pitch series (diameter 1~600mm)GB11449-89 Waveguide flange
GB11450-89 Hollow metal waveguide
Required bacteria test
GJB150.10-86 Environmental test method G for military equipment JB179A--96 Counting sampling inspection procedures and tables GJB360A-96 Test methods for electronic and electrical components GJB681-89 General specifications for radio frequency coaxial connectors Metrological confirmation system Quality assurance requirements for measuring equipment GJB2712-96 3 Requirements 3.1 Detailed specifications The requirements for each filter shall comply with the provisions of this specification and the corresponding detailed specifications. When the requirements of this specification and the detailed specifications are inconsistent, the detailed specifications shall prevail. 3.2 Qualification appraisal The filters supplied in accordance with this specification shall be products that have been qualified or approved for finalization. 3.3 Materials The materials shall comply with the provisions of this specification. However, when the specific materials are not specified, those materials that meet the requirements of this specification-2-
SJ20764-1999
and the corresponding detailed specifications shall be used. Acceptance or approval of any component material shall not be regarded as a guarantee of acceptance of the finished product.
3.3.1 Material Substitution
If the contractor wishes to substitute a specified material or component with another material, an application shall be submitted to the certification body, including information indicating that the proposed substitution is feasible. Test samples shall be provided upon request to prove the suitability of the proposed substitution. Before such substitution is made, each substitution shall be approved in writing by the certification body. 3.3.2 Flammability of Materials
Where practicable, the various materials used in the manufacture of filters shall be non-flammable and non-explosive. 3.3.3 Corrosive Materials
Corrosive materials used in any production process shall be eliminated or neutralized so that the use of such materials will not cause corrosion. Where practicable, materials used in the manufacture of filters shall be non-corrosive materials. 3.3.4 Bonding and Curing Materials
The bonding and curing materials used in the filter resonator or circuit shall meet the requirements of the filter electrical performance, bonding firmness and corresponding material specifications.
3.3.5 Metal materials
The various metal materials used to manufacture filters shall meet the requirements of anti-oxidation, corrosion resistance, easy processing and chemical plating, and their chemical composition shall meet the requirements of the corresponding material specifications. 3.4 Design and structure
The filter shall be designed and manufactured according to the intended use to meet the requirements of its electrical performance, firmness, safety, electromagnetic compatibility and reliability.
The design, structure, size and weight of the filter shall comply with the regulations (see 3.1). 3.4.1 Housing (or cavity)
The filter is divided into sealed and non-sealed types. When the filter needs to be sealed, the resonator and other internal components of the filter shall be completely sealed. The housing (or cavity) shall be made of metal materials that meet the design requirements. 3.4.2 Lead-out terminal
The lead-out terminal of the filter, if using RF coaxial connectors, shall comply with the provisions of GJB681; if using waveguide and filter flange, it shall comply with the provisions of GB11450 and GB11449; if using strip line, the electrical connection between the strip line and other components shall be guaranteed, and it shall have sufficient mechanical strength; if using microstrip line, the adhesion, solderability and resistance to soldering heat of the microstrip line shall meet the design and use requirements; if using pins (feet), the pins shall have sufficient strength and be plated with solder with a tin content of 40% to 75%, and its solderability shall comply with the requirements of 3.6, and the position and arrangement of the pins (feet) shall comply with the regulations (see 3.1).
3.4.3 Resonator
Depending on the working mode and frequency, resonators of various structural forms such as cylindrical, rectangular and coaxial can be used. 3.4.4 Threaded parts
All threaded parts shall comply with the provisions of GB193 and relevant standards. 3.4.4.1 Locking of threaded assemblies
All threaded assemblies shall not loosen under vibration. When feasible, bronze or stainless steel open locking washers shall be provided under all nuts. If the threads are matched with plastic parts, threaded metal inserts shall be pressed into the plastic parts.
3.4.4.2 Screws
Screws shall comply with the relevant provisions of GB67.
3.4.5 Internal Leads
SJ20764—1999
The internal leads of the filter shall have sufficient mechanical strength and connect the internal components to the lead terminals or the housing in an appropriate electrical connection method.
3.4.6 Appearance
The outer surface of the filter shall be clean and tidy, free of burrs, plating coating shedding, scratches, rust spots and corrosion, and no other appearance defects that affect the electrical performance. The specific requirements shall comply with the provisions (see 3.1). 3.5 Strength of Lead Terminals (When Applicable)
After the filter is tested in accordance with 4.7.2, the lead terminals shall not be loose or broken, and no other mechanical damage shall occur. 3.6 Solderability (When Applicable)
After the filter is tested in accordance with 4.7.3, at least 95% of the lead terminals shall be covered with a new layer of solder plating, and the remaining 5% of the surface shall only be allowed to show small pinholes or blank spots, and these small pinholes or blank spots should not be concentrated in a certain area.
3.7 Resistance to welding heat (when applicable)
After the filter is tested as specified in 4.7.4, there should be no obvious looseness and mechanical damage to the lead-out terminals. 3.8 Sealing (when applicable)
When the filter is tested as specified in 4.7.5, there should be no continuous bubbles escaping. 3.9 Dielectric withstand voltage
When the filter is tested as specified in 4.7.6, there should be no breakdown, arcing, insulation damage or obvious mechanical damage. 3.10 Low pressure (filters designed to work above 3000m) When the filter is tested as specified in 4.7.7, there should be no insulation damage, arcing or any performance degradation sufficient to cause filter failure.
3.11 Insulation resistance
When the filter is tested as specified in 4.7.8, the insulation resistance between each insulated lead-out terminal and the housing should meet the requirements (see 3.1). 3.12 Electrical performance
The electrical performance parameters of the filter are shown in Table 3 and shall comply with the provisions (see 3.1); the filter shall be measured in accordance with the provisions of 4.7.9 and its electrical performance shall comply with the provisions (see 3.1). Table 3 Electrical performance
Parameter name
Center frequency
Passband width
Insertion attenuation
Passband fluctuationbzxz.net
Voltage standing wave ratio
Rectangular coefficient
Group delay
Stopband width
Stopband attenuation
Power capacity
ns, ps
3.13 Extreme temperature stability
SJ20764—1999
The filter shall be tested in accordance with the provisions of 4.7.10, the dielectric withstand voltage shall comply with the provisions of 3.9, and other electrical performance shall comply with the provisions (see 3.1).
3.14 High temperature life
After the filter is tested according to 4.7.11, its coating should not have obvious peeling, rust or other physical damage, and the shell should not have cracks and bulges. The dielectric withstand voltage should comply with the provisions of 3.9, the insulation resistance should comply with the provisions of 3.11, and other electrical properties should comply with the provisions (see 3.1).
3.15 Vibration
After the filter is tested according to 4.7.12, its coating should not have obvious peeling, cracks or other physical damage. The shell should not have cracks and bulges. Its electrical properties should comply with the provisions (see 3.1). 3.16 Impact (specified pulse)
After the filter is tested according to 4.7.13, its coating should not have obvious peeling, cracks or other physical damage. The shell should not have cracks and bulges. Its electrical properties should comply with the provisions (see 3.1). 3.17 Temperature shock
After the filter is tested in accordance with 4.7.14, its coating should not have obvious peeling, cracks or other physical damage. The housing should not have physical damage such as cracks and bulges. The dielectric withstand voltage should comply with 3.9, the insulation resistance should comply with 3.11, and other electrical properties should comply with the regulations (see 3.1). 3.18 Moisture resistance
After the filter is tested in accordance with 4.7.15, its coating should not have obvious peeling, cracks or other physical damage, and the housing should not have rust. The dielectric withstand voltage should comply with 3.9, the insulation resistance should comply with 3.11, and other electrical properties should comply with the regulations (see 3.1).
3.19 Salt spray (when applicable)
After the filter is tested in accordance with 4.7.16, its coating should not have aging damage, metal parts should not be corroded, the markings should be clear, and there should be no other physical damage.
3.20 Steady-state acceleration (when applicable)
After the filter is tested in accordance with 4.7.17, there should be no physical damage and its electrical performance should meet the requirements (see 3.1). 3.21 Solvent resistance (when applicable)
After the filter is tested in accordance with 4.7.18, there should be no physical damage and the markings should be clear. The coating or surface treatment layer should not soften, peel or show other aging damage. 3.22 Mold (when applicable)
All surface materials should be non-culture materials for mold growth, or these materials should be properly treated to delay the growth of mold. The contractor should ensure that all surface materials have the ability to resist mold (see 4.7.19), or the outer surface of the material should be free of mold growth after testing in accordance with 4.7.19. 3.23 Marking
The filter should be marked with model specifications, trademarks, production date, and terminal identification marks. The marking should be clear and firm. When the filter size is too small to mark all the contents, the marking contents can be simplified (see 3.1), but the packaging box must be fully marked.
3.24 Processing quality
The filter should be processed by a method that can ensure consistent quality and should be free of other defects that affect life or use and appearance.
4 Quality Assurance Provisions
4.1 Inspection Responsibility
SJ20764—1999
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 item specified in this specification. 4.1.1 Qualification Responsibility
All products must meet all requirements of Chapter 3 and Chapter 5 of this specification. The inspections specified in this specification shall become an integral part of the contractor's entire inspection system or quality assurance program. 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. Sampling for quality consistency inspection does not allow the submission of products that are known to be defective, nor can the ordering party be required to accept defective products. 4.1.2 Test equipment and inspection devices
The contractor shall establish and maintain test equipment, measuring equipment and inspection devices that meet the inspection requirements and have sufficient accuracy, quality and quantity to carry out the required inspections. At the same time, a metrological calibration system that complies with the regulations shall be established and maintained. The metrological calibration system shall be implemented in accordance with GJB2712 to control the accuracy of the measuring and test equipment. 4.2 Inspection classification
The inspection classification specified in this specification is as follows:
a. Material inspection (see Article 4.4);
b. Identification inspection (see Article 4.5);
c. Quality consistency inspection (see Article 4.6). 4.3 Inspection conditions
Unless otherwise specified in this specification, all inspections shall be carried out under the standard atmospheric conditions for the test specified in 4.1.1 of GJB360A.
4.4 Material Inspection
Material inspection shall consist of a certificate supported by verification data to prove that the materials used to manufacture the filter meet the requirements of 3.1 and 3.3 before manufacture.
4.5 Qualification Inspection
Qualification inspection shall be conducted in a laboratory or facility approved by the certification body, and the samples used shall be products produced by equipment and processes used in normal production. 4.5.1 Number of Samples
The number of filter samples subjected to qualification inspection shall be as specified in Table 4. 8 filters of each type shall be submitted, and only 6 filters shall be submitted if mold testing is not required. 4.5.2 Inspection Procedure
The samples shall be subjected to the inspections in Table 4 in the order shown. All samples shall be subjected to Group 1 inspection, and then the samples shall be divided into Groups 2, 3, and 4 as specified in Table 4 and subjected to the inspections of each group separately. 4.5.3 Failure
Qualification approval shall be refused if one or more non-conforming products are found in the qualification inspection. 4.5.4 Maintaining the qualification of appraisal
In order to maintain the qualification of appraisal, the contractor shall submit a quality consistency inspection report to the appraisal institution every 12 months. The summary of the report shall be submitted within 60 days after the end of each 12-month cycle as the basis for maintaining the qualification of appraisal.
SJ20764—1999
Maintaining the qualification of appraisal shall be based on whether the appraised products meet the following requirements within the 12-month cycle: a.The contractor has not changed the design of the original qualified product; b. The summary of the test results of the Group A batch inspection that has been conducted shall at least indicate the number of qualified batches, the number of unqualified batches and the group to which the unqualified batches belong. The test results of all repair batches shall be marked and the reasons shall be stated. c. The summary of the test results of the Group C periodic inspection that has been conducted shall include the number of failures and failure modes. The summary shall include the test results of all periodic inspections completed within 12 months. If the test result summary indicates non-conformity with the requirements of the specification and corrective measures approved by the certification body are not taken, the product will be withdrawn from the catalog of qualified products.
Failure to submit a report within 60 days after the end of each 12-month cycle may result in the loss of the product's qualification. In addition to the regular submission of inspection data, at any time during the 12-month cycle, if the inspection data indicates that the qualified product that meets the requirements of this specification has failed, the contractor shall immediately report to the certification body. If the product is not produced within the reporting period, a report should be submitted to prove that the contractor still has the necessary capabilities and facilities to produce such products. If the product is still not produced within two consecutive reporting periods, the contractor may be required to submit the product for testing in accordance with the requirements of the appraisal inspection and explain the reasons for not producing it, based on the decision of the appraisal agency. Table 4 Appraisal inspection
Inspection items
Appearance and structural inspection1)
Lead terminal strength (when applicable)
Weldability (when applicable)
Resistance to welding heat (when applicable)
Sealing (when applicable)
Dielectric withstand voltage
Low air pressure (when applicable)
Insulation resistance
Electrical properties
Limit temperature stability
High temperature life
Impact (specified pulse)
Temperature shock
Moisture resistance2)
Salt spray (when applicable)
Steady-state acceleration (when applicable) ）
Solvent resistance (when applicable)
Mold (when applicable)3)
Requirement Article No.
3.1, 3.3, 3.4
3.23, 3.24
Test Method Article No.
Number of Tested Samples
8 (including 2 samples for mold test)
2 out of 4
Note: 1) Non-destructive test:
SJ20764—1999
2) When there are provisions for salt spray test, the 4 samples shall be divided into two groups of equal number, one group for moisture resistance test and the other for salt spray test. After completing these tests in the above manner, each group shall submit test data separately. 3) If the contractor provides proof that all surface materials are mold resistant, this test can be omitted. 4.6 Quality consistency inspection
4.6.1 Batch inspection
Batch inspection of products shall consist of Group A inspection. Batch inspection is the product delivery inspection. 4.6.1.1 Inspection batch
An inspection batch shall consist of all products of the same model produced under substantially the same conditions and submitted for inspection at the same time.
4.6.1.2 Group A inspection
Group A inspection shall consist of the inspection items specified in Table 5 and shall be carried out in the order shown. Table 5 Group A inspection
Inspection items
Group A1
Appearance and mechanical inspection
Seal (when applicable)1)
Dielectric withstand voltage
Insulation resistance
Group A2
Electrical properties
RequirementsChapter number
3.1, 3.3, 3.4
3.23, 3.24
Inspection methodChapter number
Minor nonconformity
Major nonconformity
Note: 1) Any filter showing signs of leakage is allowed to undergo remedial treatment if there is evidence that the treatment is appropriate and the rest of the filters in the batch have undergone the same treatment. 4.6.1.2.1 Sampling plan
The sampling plan for group A1 shall be in accordance with the one-time sampling plan for general inspection level II in GJB179A, and the sampling plan for group A2 shall be in accordance with the special inspection level S--3 in GJB179A. The acceptable quality level (AQL) of group A1 and group A2 shall be in accordance with Table 5. The definitions of serious nonconforming products and minor nonconforming products are as given in GJB179A. 4.6.1.2.2 Rejected batch
If an inspection batch is rejected, the contractor may repair the batch of products to correct its defects or remove the defective products and resubmit them for re-inspection. The resubmitted batch shall be inspected by a tightened inspection. This batch shall be distinguished from the new batch and clearly marked as a resubmitted batch. If the resubmitted batch fails the inspection, the Group A inspection fails and the batch shall not be submitted for inspection again. 4.6.1.2.3 Sample Handling
If the inspection lot is accepted, the products that have passed the Group A inspection and are still within the specified requirements can be delivered according to the contract or order. However, products that are deformed or otherwise damaged during the inspection should not be delivered according to the contract or order. 4.6.2 Periodic Inspection
The periodic inspection consists of the Group C inspection. The delivery of products that have passed the Group A inspection should not be postponed until the results of the periodic inspection are obtained. If the results of the Group C inspection indicate that they are unqualified, they should be handled in accordance with 4.6.2.1.4. - 8-24
Inspection MethodChapter No.
Minor Nonconformities
Major Nonconformities
Note: 1) Any filter showing signs of leakage is allowed to undergo remedial treatment. This is provided that there is evidence that the treatment is appropriate and that the remaining filters in the batch have undergone the same treatment. 4.6.1.2.1 Sampling Plan
The sampling plan for group A1 is in accordance with the single sampling plan for general inspection level II in GJB179A, and the sampling plan for group A2 is in accordance with the special inspection level S--3 in GJB179A. The acceptable quality level (AQL) for group A1 and group A2 is in accordance with Table 5. The definitions of major nonconformities and minor nonconformities are as given in GJB179A. 4.6.1.2.2 Rejected Batch
If an inspection batch is rejected, the contractor may return the batch of products to correct its defects or remove the defective products and resubmit them for re-inspection. The resubmitted batch shall be inspected by a tightened inspection. Such batch shall be distinguished from new batches and clearly marked as a resubmitted batch. If the resubmitted batch fails the inspection, the Group A inspection shall fail and the batch of products shall not be submitted for inspection again. 4.6.1.2.3 Handling of samples
If the inspection batch is accepted, the products that have passed the Group A inspection and are still within the specified requirements can be delivered according to the contract or order. However, products that are deformed or otherwise damaged during the inspection shall not be delivered according to the contract or order. 4.6.2 Periodic inspection
Periodic inspection consists of Group C inspection. Products that have passed the Group A inspection should not be postponed for delivery until the results of the periodic inspection are obtained. If the results of the Group C inspection indicate failure, it shall be handled in accordance with 4.6.2.1.4. - 8-24
Inspection MethodChapter No.
Minor Nonconformities
Major Nonconformities
Note: 1) Any filter showing signs of leakage is allowed to undergo remedial treatment. This is provided that there is evidence that the treatment is appropriate and that the remaining filters in the batch have undergone the same treatment. 4.6.1.2.1 Sampling Plan
The sampling plan for group A1 is in accordance with the single sampling plan for general inspection level II in GJB179A, and the sampling plan for group A2 is in accordance with the special inspection level S--3 in GJB179A. The acceptable quality level (AQL) for group A1 and group A2 is in accordance with Table 5. The definitions of major nonconformities and minor nonconformities are as given in GJB179A. 4.6.1.2.2 Rejected Batch
If an inspection batch is rejected, the contractor may return the batch of products to correct its defects or remove the defective products and resubmit them for re-inspection. The resubmitted batch shall be inspected by a tightened inspection. Such batch shall be distinguished from new batches and clearly marked as a resubmitted batch. If the resubmitted batch fails the inspection, the Group A inspection shall fail and the batch of products shall not be submitted for inspection again. 4.6.1.2.3 Handling of samples
If the inspection batch is accepted, the products that have passed the Group A inspection and are still within the specified requirements can be delivered according to the contract or order. However, products that are deformed or otherwise damaged during the inspection shall not be delivered according to the contract or order. 4.6.2 Periodic inspection
Periodic inspection consists of Group C inspection. Products that have passed the Group A inspection should not be postponed for delivery until the results of the periodic inspection are obtained. If the results of the Group C inspection indicate failure, it shall be handled in accordance with 4.6.2.1.4. - 8-
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