SJ 20125-1992 General specification for head-worn noise-resistant transmitter-receiver sets, receiver sets and earmuffs

This standard specifies the safety requirements for shortwave single sideband communication equipment. This standard applies to shortwave single sideband communication equipment and any auxiliary equipment necessary for the normal operation of the equipment, including combination and matching networks. The use of this standard is not limited to type testing, but can also be used for acceptance testing after equipment installation, testing after equipment component changes, and testing at appropriate time intervals to ensure the continued safety of the equipment throughout its life. SJ 20125-1992 General Specification for Head-worn Anti-Noise Transceiver Sets, Receiver Sets and Earmuffs SJ20125-1992 Standard Download Decompression Password: www.bzxz.net

Military Standard FL5965 of the Electronic Industry of the People's Republic of China
SJ 20125—92
General Specification for Head-mounted Noise-Reducing Transmitter and Receiver Sets,
Receiver Sets and Earmuffs
1992-11-19 Issued
1993-05-01 Implementation
Issued by the Ministry of Machinery and Electronics Industry of the People's Republic of China 1 Scope
1.1 Subject wear·,
1.2 Scope of application·
2 Referenced documents
3 Requirements
3.1 Detailed specifications.
3.2 Qualification appraisal
3.4 ​​Design and structure
3.5 Performance requirements
3.6 Environmental test requirements
3.7 Marking
3.8 Appearance quality
4 Quality assurance regulations|| tt||Inspection responsibilities
4.2 Inspection conditions
4.3 Inspection classification
Identification inspection
Quality consistency inspection
Inspection and test methods
5 Delivery preparation
5.1 Packaging
5.3 Transportation and storage
5.4 Marking...
6 Notes
6.1 Intended use
6.2 Contents of order parts
Appendix A Test stand for measuring the electrical performance of head-mounted transmitter and receiver sets, receiver sets and earmuffs (supplementary parts)++++++++ (16)
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1 Scope
General Specification for Head-worn Anti-noise Transmitter and Receiver Sets, Receiver Sets and Earmuffs for Military Electronic Industry of the People's Republic of China
1.1 Subject Content
SJ 20125—92
This specification specifies the technical requirements and quality assurance for military head-worn transmitter and receiver sets, receiver sets and anti-noise earmuffs.
1.2 Scope of Application
This standard applies to head-worn anti-noise transmitter and receiver sets, receiver sets and earmuffs for wired and wireless communications of the Army, Navy and Air Force. The "product" referred to in this specification refers to the head-worn transmitter and receiver set, receiver set and earmuffs respectively. 2 Referenced Documents
The valid versions of the following documents constitute the parts of this specification within the scope specified in this specification. GJB179 Counting sampling inspection procedures and tables
GJB2139 General specification for dynamic and electromagnetic receivers SJ20045 General specification for air-conducted dynamic and electromagnetic transmitters S.T20368 Performance measurement methods for transmitters and receivers SJ20128 Environmental test methods for communication electroacoustic devices SI20410 Model naming methods for military electroacoustic devices 3 Requirements
3.1 Detailed specifications
Specific product requirements shall comply with the provisions of this specification and the corresponding detailed specifications. If the requirements of this specification and the detailed specifications are inconsistent, the detailed specifications shall prevail
3.2 Qualification appraisal
Products submitted in accordance with this specification shall be products that have been qualified or approved for finalization. 3.3 Materials
All materials used in the product shall comply with the provisions of this specification. If certain materials are not specified, when using these materials, it shall be ensured that the product meets the performance requirements specified in this specification. The acceptance or approval of any material of the product shall not be used as the basis for the acceptance of the product by the Ministry of Machinery and Electronics Industry of the People's Republic of China on November 19, 1992 and implemented on May 1, 1993.
3.3.1 Anti-mildew materials
SJ20125—92
Unless otherwise specified, the materials used in the product shall have anti-mildew ability. When materials that can breed mold are used, anti-mildew treatment shall be carried out before assembly.
3.3.2 Metal materials
The metal materials used in the product shall have sufficient strength, and the materials shall be corrosion-resistant or surface-treated. 3.3.3 Adhesives
Water-soluble adhesives shall not be used.
3.4 ​​Design and structure
3.4.1 Comfort
The design and manufacture of the products specified in this specification shall ensure that they are easy to wear and do not cause allergic reactions to the wearer's skin.
3.4.2 Replaceability
The design of products of the same model should ensure mechanical and electrical matching with the equipment. 3.4.3 Surface treatment
The product should be surface treated, and the color after treatment should be matte protective color. 3.4.4 Microphone
The microphone used in the product should comply with the general and detailed specifications of the corresponding microphone. 3.4.5 Receiver
The receiver used in the product should comply with the general and detailed specifications of the corresponding receiver. 3.4.6 Ear shell and microphone protective cover
When necessary, the ear shell and microphone protective cover should be made of high-strength plastic. The thickness and external dimensions of the ear shell should be optimized to ensure good sound insulation performance. 3.4.7 Receiver installation
The installation of the receiver in the product should ensure easy disassembly and assembly. 3.4.7.1 Earmuff filling material
The filling material should not be exposed.
3.4.7.2 Fixing device
The fixing method of the receiver or earmuff to the headband and soft belt shall meet the requirements of the design documents. 3.4.7.3 Ear heat
During normal use, the ear pad shall ensure relative stability and shall not cause allergic reactions on the wearer's skin. 3.4.8 Headband and soft belt assembly
The structure of the headband and soft belt assembly shall meet the requirements of the design documents and ensure that various people can adjust and wear comfortably.
3.4.9 Microphone connection mechanism
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SJ20125—92
The connection mechanism of the microphone shall be a connecting rod or a fixed soft belt, and the connecting rod shall have support and adjustment capabilities. The soft belt shall not cause allergic reactions on the wearer's skin.
3.4.10 Cables and connectors
Cables and connectors shall be specified by detailed specifications. 3.5 Performance requirements
3.5.1 Microphone
The performance requirements of the microphone shall meet the requirements of its general specification and corresponding detailed specifications. 3.5.2 Receiver
The performance requirements of the receiver shall meet the requirements of its general specification and corresponding detailed specifications. 3.5.3 The performance requirements of the transmitter and receiver set, the receiver set and the earmuffs shall meet the requirements of Table 1. Table 1
Performance items
Transmit impedance
Transmit sensitivity
Transmit frequency response
Signal-to-noise ratio
Axial discrimination
Receive impedance
Receive sensitivity
Receive frequency response
Acoustic attenuation
Head ring sliding adjustment
Head ring clamping blade
Tensile performance
Cable performance
3. 5.3. 1 Call
Transmitter and Receiver Set
Receiver Set
When the product is tested for call in accordance with the provisions of 4.6.3.1, there should be no humming, popping or other noise that impairs the quality of the reproduced signal.
3.5.3.2 Transmit Impedance
SJ20125—92
When the product is measured in accordance with 4.6.3.2, it should meet the requirements (see 3.1). 3.5.3.3 Transmit Sensitivity
When the product is measured in accordance with 4.6.3.3, it should meet the requirements (see 3.1). 3.5.3.4 Transmit Frequency Response
When the product is measured in accordance with 4.6.3.4, it should meet the requirements (see 3.1). 3.5.3.5 Signal-to-noise ratio
When the transmitter and receiver are measured in accordance with 4.6.3.5, they shall meet the requirements (see 3.1). 3.5.3.6 Axial discrimination
When the transmitter and receiver are measured in accordance with 4.6.3.6, they shall meet the requirements (see 3.1). 3.5.3.7 Receive impedance
When the product is measured in accordance with 4.6.3.7, it shall meet the requirements (see 3.1). 3.5.3.8 Receive sensitivity
When the product is measured in accordance with 4.6.3.8, it shall meet the requirements (see 3.1). 3.5.3.9 Receive frequency response
When the product is measured in accordance with 4.6.3.9, it shall meet the requirements (see 3.1). 3.5.3.10 Sound attenuation
Earmuffs shall meet the requirements when measured in accordance with 1.6.3.10 (see 3.1) 3.5.3.11 Headband sliding adjustment
The headband shall be able to be adjusted flexibly. When measured in accordance with 4.6.3.11, the force required to be applied shall be between 4.2 and 13N. 3.5.3.12 Headband cooling force
When measured in accordance with 4.6.3.12, the headband shall meet the requirements (see 3.1). 3.5.3.13 Tensile strength
When measured in accordance with 4.6.3.13, the headband shall meet the requirements (see 3.1). 3.5.3.14 Cable performance
The performance of the cable used in the product shall comply with the regulations (see 3.1). 3. 5. 3. t5 Withstand voltage
When the product is measured according to 4.6.3.15, there shall be no arcing and sticking. 3.6 Environmental test requirements
The product shall be subjected to the various environmental tests required by 3.6.1~3.6.7, and the test categories shall comply with the provisions of the detailed specifications.
3.6.1 Drop
After the product is subjected to the drop test specified in Table 2, there shall be no looseness, deformation or other mechanical damage. After the test, the product shall be subjected to the call test according to 4.6.3.1, and shall comply with the requirements of 3.5.3.1. -4-
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3.6.2 Vibration
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Table 2 Drop test requirements
Height (m)
Number of drops (times)
After the product has undergone the vibration test specified in Table 3, there should be no looseness and obvious mechanical damage. After the test, the product shall be tested according to 4.6.3.1 and shall meet the requirements of 3.5.3.1. Table 3 Vibration test requirements
Range of moisture spots
10~55~10
3.6.3 Temperature shock
Amplitude (double amplitude)
One scanning time
Test time
After the product has undergone the temperature shock test specified in Table 4, there should be no cracking or deformation. After the test, the product shall be tested according to 4.6.3.1 and shall meet the requirements of 3.5.3.1. Table 4 Humidity shock test requirements
3.6.4 Damp heat
-55→85
-55→70
Number of cycles
(times)
After the product is subjected to the damp heat test specified in Table 5, it shall not cause failure or corrosion. After the test, the product shall be tested according to 4.6.3.1 and 4.6.3.15 and shall meet the requirements of 3.5.3.1 and 3.5.3.15. Table 5 Requirements for damp heat test
3.6.5 Impact
30~-60
Relative humidity
Test time
After the product is subjected to the impact test specified in Table 6, there should be no cracking, deformation or other mechanical damage. After the test, the product shall be subjected to a communication test in accordance with Article 4.6.3.1 and meet the requirements of Article 3.5.3.1. Tea
3.6.6 Salt spray
Acceleration
(m/st)
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Table 6 Impact test requirements
Pulse duration
Total number of impacts
(Shen)
Impact waveform
Half-sine waveform
Half-sine waveform
After the product is subjected to the salt spray test specified in the table, there should be no surface rust, coating shedding and other faults. After the test, the product shall be tested according to Article 4.6.3.1 and shall meet the requirements of Article 3.5.3.1. Table 7#
Salt spray test requirements
Salt solution
6. 5 ~7. 2
3. 6. 7 Anti-mildew performance
Salt sedimentation rate
(ml/80 cm2.h)
1, 0~-2.0
(Take the average value of more than 16h)
Test temperature
Salt spray treatment method
Spray for 24h, dry for 24h under normal atmospheric conditions. One cycle is completed.
Continuous spray
Test time
After the product is tested according to 4.6.4.7, it should meet the requirement of no more than secondary mold growth and no mechanical damage should occur. After the test, the product shall be tested according to 4.6.3.1 and shall meet the requirements of 3.5.3.1: 3.7 Marking
The product shall be marked according to the following items, and all marks shall be clear, obvious and not easy to damage. The marking shall include the following contents:
a. Trademark:
b. Model:
c. Specification:
d. Inspection seal or certificate:
e. Production date.
3.8 TT Technical Quality
The product shall be well surface treated and shall be free of looseness, deformation, burr, crack and foreign matter. 4 Quality Assurance Provisions
4.1 Inspection Responsibility
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SJ20125—92
Unless otherwise specified in the contract or order, the manufacturer shall be responsible for all inspections specified in the specification. When necessary, the ordering party or the supervisory inspection agency has the right to inspect any inspection item specified in the specification. 4.1.1 Responsibility for Conformity
All products must comply with the requirements specified in Chapter 3 and Chapter 5 of this specification. The inspections specified in this specification shall become an integral part of the manufacturer's entire inspection system and quality program. If the contract includes inspection requirements not specified in this specification, the manufacturer shall also ensure that the products submitted for acceptance meet the requirements of the contract. 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. 4.1.2 Measuring instruments and test equipment
The manufacturer shall establish and maintain test equipment and inspection devices with sufficient accuracy, quality and quantity to carry out the required inspections. At the same time, a metrological calibration system that complies with regulations shall be established and maintained to control the accuracy of measuring and test equipment.
4.2 Test conditions
4.2.1 Normal test atmospheric conditions
Unless otherwise specified, all tests specified in this specification shall be carried out under the following normal test atmospheric conditions: temperature: 15~35℃;
Relative humidity: 20%~80%;
Air pressure: 86~106 kPa
4.2.2 Acoustic conditions
Unless otherwise specified, the acoustic measurement conditions in this specification shall comply with the provisions of "20368 Microphone and Receiver Performance Measurement Method".
4.3 Test classification
The test classifications in this specification are as follows:
a. Appraisal test;
b. Quality consistency test.
4.4 Appraisal test
Appraisal test shall be It shall be carried out in the laboratory designated by the supervision and inspection agency. 4.4.1 Sample size
The number of microphones, receivers and microphone sets specified in Table 8 shall be provided for identification test. Table 8
Product name
Transmitter and receiver set
Receiver set
Number of microphones
Number of receivers
Number of assemblies
4.4.2 Inspection procedure
SJ20125 --92
The identification and inspection shall be carried out in the order specified in Table 9. All transmitter and receiver groups, receiver groups and earphones shall be subjected to Group III inspection according to the performance requirements specified in Table 1, and then divided into two groups for Group IV and Group V inspection respectively. Table 9 Identification inspection
Inspection content
Transmitter
Receiver
Appearance and mechanical inspection
Transmit impedance
Transmit sensitivity|| tt||Transmitting frequency response
Signal to noise ratio
Axial discrimination
Connection sensitive impedance
Connection sensitivity
Receiving frequency response
Acoustic attenuation
Head ring sliding adjustment
Head ring clamping force
Tensile performance
Temperature shock
Cable performance
4.4.3 Failure
Request clause
3. 1. 3. 3, 3. 4, 3. 7, 3. 83. 5. 3. 1
3. 5. 3. 3
3. 5. 3. 4
3. 5.3. 6
3. 5. 3. 9
3. 5. 3, 11
3. 5. 3. 12
3. 5. 3. 13
3. 5. 3. 15
3. 5. 3. 14
Only one failure occurs and the test fails the qualification inspection. 4.4.4 Maintenance of qualification
Method clause
4. 6.2. 1
4. 6. 2. 2
4. 6. 3. 1
4. 6. 3. 2
4. 6. 3. 3
4. 6. 3. 4
4. 6. 3. 5bzxZ.net
4. 6. 3. 6
4. 6. 3.7
4. 6. 3. 8
4. 6. 3. 9
4. 6. 3. 10
4, 6. 3. 11
4. 6. 3. 12
4. 6. 3. 13
4. 6. 3. 15
4. 6. 4. 1
4. 6. 4. 2
4. 6. 4. 4
4.6. 4. 6
4, 6. 3. 14
4. 6. 4. 7
To retain the qualification, the manufacturer shall submit an application report to the supervision and inspection agency every 12 months, and the supervision and inspection agency shall determine the deadline for report submission. The report shall include: a. The results of product delivery inspection (i.e., Group A and Group B inspection) expressed in the number of qualified batches and failed batches, and the inspection results of the repair batches-8
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must be identified and explained.
SJ 20125--92
b. The result report of periodic inspection (i.e., Group C inspection). If the test results in the report are inconsistent with the requirements of this specification or detailed specifications, and improvement measures are not taken, the qualification of the product shall be cancelled from the qualified product log. If there is no product within the period of submitting the report, a report can be submitted to indicate that there is still the ability and necessary equipment to carry out the work, or it can be handled according to the opinions of the supervision and inspection agency. 4.5 Quality consistency inspection
4.5.1 Product delivery inspection
Product delivery inspection includes Group A and Group B inspection. 4.5.1.1 Inspection batch
Products in the same inspection batch shall include all products of the same model produced under the same conditions and submitted for inspection at the same time.
4. 5. 1. 2 Group A inspection
Group A inspection shall include the inspections specified in Table 10. a. Sampling plan
The sampling plan shall be in accordance with the general inspection level II in GJB179, and the acceptable quality level (AQL) shall be in accordance with the provisions of Table 10. The defect classification of appearance and mechanical inspection is shown in Table 11. Table 10 Inspection of Group A
Inspection content
Appearance and mechanical inspection
Requirement clause
3, 1, 3. 3, 3. 1, 3. 7, 3. 83. 5. 3. 1
Method clause
4. 6. 3. 15
Major defect
Minor defect
Inspection content
Material and surface
Parts and assembly
b. Rejection of batch
SJ 20125—92
Table 11 Defect classification of appearance and mechanical inspection Defect classification
Major defect
Minor defect
Material does not meet the requirements. Wrong or incomplete surface treatment. The surface has scratches, burrs or wear, or there is a small amount of peeling, peeling or damage to the bottom metal scale.
Missing or wrong assembly of parts, cracking of unqualified parts, causing "assembly of unqualified parts, but not affecting the product's work failure.
Marking is missing, wrong or peeling. The handwriting is illegible. Any foreign matter causes short circuit or abnormal sound. Desoldering, cold soldering, insufficient solder (less than twice the diameter of the wire).
Function.
The color of the mark is not bright or stained, but it can be recognized.
Any foreign matter affects the appearance, but does not affect the function.
If a batch is rejected, the manufacturer can correct its failure or screen out the failed products and resubmit them for inspection. The resubmitted batch should be subject to stricter inspection. Such batches should be distinguished from new batches and clearly marked as resubmitted batches. 4.5. 1. 3 B group inspection
B group inspection shall include the inspection items specified in Table 12, and shall be inspected on samples that have passed the A group inspection. a: Sampling plan
The sampling plan shall be in accordance with the special inspection level S-4 in GJB179, and the sample size shall be determined by the inspection batch of the A group inspection. AQL. is 2.5.
b. Rejected batch
If an inspection batch is rejected, the manufacturer shall correct its failure or screen out the failed products and resubmit it for inspection. The resubmitted batch shall be subject to stricter inspection. Such batches shall be distinguished from new batches and clearly marked as newly submitted batches. - 10
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b. Rejected batches
If an inspection batch is rejected, the manufacturer shall correct its failure or screen out the failed products and resubmit it for inspection. The resubmitted batch shall be subject to stricter inspection. Such batches shall be distinguished from new batches and clearly marked as new submission batches. - 10
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b. Rejected batches
If an inspection batch is rejected, the manufacturer shall correct its failure or screen out the failed products and resubmit it for inspection. The resubmitted batch shall be subject to stricter inspection. Such batches shall be distinguished from new batches and clearly marked as new submission batches. - 10
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