This specification specifies the quality assurance requirements and delivery preparation for GPS timing receiving equipment. This specification applies to the development, production and use of GPS timing receiving equipment (hereinafter referred to as equipment) that receives GPS satellite signals and provides accurate time and standard frequency, and is also the basis for formulating its product specifications. SJ 20726-1999 GPS timing receiving equipment general specification SJ20726-1999 standard download decompression password: www.bzxz.net

Military Standard of the Electronic Industry of the People's Republic of China FL5820
SJ20726-—1999
General specification for GPS timing receiving equipment
General specification for GPS timing receiving equipment eguipment
1999-11-10 Issued
1999-12-01 Implementation
Approved by the Ministry of Information Industry of the People's Republic of China 1 Scope
1.1 Subject matter
1.2 Applicable scope
1.3 Classification
2 Reference documents...
3.1 Qualification appraisal
3.2 Design and structure.*
Safety
Dimensions and weight
Marking and code
Appearance quality
Performance characteristics·
3.12 Environmental requirements
3.13 Reliability
Maintainability
Electromagnetic compatibility
|4 Quality Assurance Provisions
Inspection Responsibility
Inspection Classification
Inspection Conditions
Identification Inspection
Quality Consistency Inspection
Packaging Inspection
Inspection Methods
5 Delivery Preparation...
5.1 Sealing and Packing
5.2 Packing
5.3 Transportation and Storage
5.4 Marking
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Notes
6.1 Intended Use
2 Contents of Order Documents
, Scope
General Specification for GPS Timing Receiving Equipment, Military Standard of the Electronic Industry of the People's Republic of China
General specification for GPS timing receiving equipment
1.1 Subject content
SJ20726--1999
This specification specifies the requirements for quality assurance and delivery preparation of GPS timing receiving equipment. 1.2 Scope of application
This specification applies to the development, production and use of GPS timing receiving equipment (hereinafter referred to as equipment) that receives GPS satellite signals and provides accurate time and standard frequency, and is also the basis for formulating its product specifications. 1.3 Classification
This specification divides the equipment into two categories according to the different use environments: Category A: Equipment mainly used indoors on the ground and in vehicles; Category B: Equipment mainly used in ship cabins. 2 Referenced Documents
GB15527--95 General Technical Requirements for Marine Global Positioning System (GPS) ReceiversGJB4.5-83 Environmental Test for Ship Electronic EquipmentConstant Condensation Heat TestGJB4.8-83 Environmental Test for Ship Electronic EquipmentYanzhen TestGJB150.2-86 Environmental Test Methods for Military EquipmentLow Pressure (Altitude) TestGJB150.3-86 Environmental Test Methods for Military EquipmentHigh Temperature TestGJB150.4-86 Environmental Test Methods for Military EquipmentLow Temperature TestGJB150.9--86 Environmental Test Methods for Military EquipmentWet Heat TestGJB150.10--86 Environmental Test Methods for Military EquipmentBacteria TestGJB150.11-86 Environmental Test Methods for Military EquipmentSalt Spray TestGJB150.16 —86 Environmental test methods for military equipment Vibration test GJB150.1886 Environmental test methods for military equipment Shock test GJB151A—97 Requirements for electromagnetic emission and sensitivity of military equipment and systems GJB152A—97 Measurement of electromagnetic emission and sensitivity of military equipment and systems GJB179A—96 Counting sample inspection procedures and tables GJB367.1--87 General technical conditions for military communication equipment. Design and manufacturing requirements GJB367.5-87 General technical conditions for military communication equipment Packaging, transportation and storage requirements GJB368A-94 General outline for equipment maintainability Ministry of Information Industry of the People's Republic of China Issued on November 10, 1999 TiiKAoNrKAca
Implementation on December 1, 1999
SJ 20726—1999
GJB437--88 Military Software Development Specifications
GJB438—88 Military Software Documentation SpecificationsGJB439—88 Military Software Quality Assurance SpecificationsGJB450—88 General Outline for Reliability of Equipment Development and ProductionGJB899—90 Reliability Appraisal and Acceptance TestGJB900—90 General System Safety SpecificationsGJB1182—91 Protective Packaging and Packing LevelsGJB1765—93 Military Material packaging mark
GJB2072-94Maintainability test and evaluation
GJB2715--96General terminology for national defense metrology
GB2762-96Measuring method for long-term frequency characteristicsGJB3154-98General specification for shipborne GPS satellite navigatorsJJG181-89Verification specification for high-stability quartz crystal oscillators3 Requirements
3.1Qualification appraisal
Products submitted in accordance with this specification shall be products that have been qualified or approved for finalization. 3.2Design and structure
3.2.1The equipment in this specification generally consists of a GPS satellite receiving antenna, a signal receiving and processor, a time frequency information and data reading device, a display and other output devices, and a control and interface interface. 3.2.2The electrical and mechanical performance design shall be carried out in accordance with this specification, product specifications and other relevant standards. The mechanical characteristics, electrical characteristics, environmental adaptability, reliability, etc. of the equipment shall meet the product's use requirements. 3.2.3 The most advanced circuits, structures and processes should be used as much as possible to improve the degree of universalization, serialization and modularization of design.
3.3 Interchangeability
In addition to complying with the provisions of Article 1.7 of GJB367.1, interchangeability should also meet the requirements of information interconnection. 3.4 Safety
The safety design of the equipment should comply with the requirements of GJB900. When the antenna input and output connectors and the input and output interfaces of the GPS receiver are short-circuited or grounded for a short period of time (lasting 5 minutes), the equipment should not be permanently damaged. 3.5 Energy consumption
Energy consumption requirements are specified by product specifications.
3.6 Dimensions and weight
The dimensions and weight of the equipment are specified by product specifications. 3.7 Color
The protective color of the equipment shall be specified by the product specification, and the other colors shall comply with the provisions of Article 1.20 of GB367.1. 3.8 Marking and Code
The marking and code shall comply with the provisions of Article 1.21 of GJB367.1. 3.9 Appearance Quality
The surface coating shall be bright, beautiful, uniform and consistent, and shall not have defects such as bubbles, cracks, condensation, shedding, scratches, etc. 12 -
3.10 Software
SJ 20726-1999
Software development shall comply with the requirements of GJB437, software documentation shall comply with the requirements of GJB438, and software quality assurance shall comply with the requirements of GJB439.
3.11 Performance Characteristics
The performance specified in this specification refers to the basic performance indicators of receiving GPS satellite L, (1575.42MHz) frequency, C/A code signal, obtaining time and frequency information from it, and providing UTC time or standard frequency signal in the SA case. The specific performance requirements of the equipment shall be specified by the product specifications, but shall not be lower than the requirements of this specification. 3.11.1 Receiving sensitivity (see 4.7.10.2) a. Capture sensitivity: When the GPS signal level at the input end of the equipment antenna (antenna gain 0dB) is -130dBm, the equipment should be able to capture the signal:
b. Tracking sensitivity: When the signal level drops below -133dBm when the equipment is tracking a satellite, the receiver will fire lock.
3. 11.2 Capture time (see 4.7.10.3) The time from the time the equipment is turned on to the time it first gives a positioning or timing output that meets the accuracy requirements. The longest time shall not exceed 30 minutes.
3.11.3 Time and frequency signal stabilization time (see 4.7.10.4) The time it takes for the equipment to lock onto the GPS satellite signal and give the UCT time or standard frequency signal that meets the index requirements from power on. The longest time shall not exceed 6 hours. 3.11.4 Positioning accuracy (see 4.7.10.5)
The equipment measures the consistency between the position coordinates of its antenna and the standard position coordinates of the antenna. The horizontal position accuracy shall not exceed 100m (2drms); the vertical position accuracy shall not exceed 156m (2drms). 3.11.5 Timing accuracy (see 4.7.10.6) The consistency between the UTC time given by the equipment and the international UTC time, also known as timing accuracy, shall not exceed 340 ns (95% confidence level).
3.11.6 Frequency stability (see 4.7.10.7) The frequency stability of the device output frequency of 5MHz or 10MHz should be better than 1x10-9 (10s average). 3.11.7 Frequency accuracy (see 4.7.10.8) The frequency accuracy (also known as frequency deviation) of the device output frequency should be better than 1×10-. 3.11.8 Frequency accuracy of built-in crystal oscillator (see 4.7.10.9) The frequency accuracy of built-in crystal oscillator should be better than 1×10-7. 3.11.9 Interface (see 4.7.10.10)
a. For devices with common view comparison function, there should be at least one time or standard frequency input interface: b. The device should have at least one time standard signal (1pps) or frequency signal (5MHz or 10MHz) output interface:
G, for devices with GPS data output power, the output interface data format should comply with the requirements of Figure 1 of GB/T 15527 (i.e. format NMEA0183).
3.1t.10 Continuous working time (see 4.7.10.11)Unless otherwise specified, the equipment shall be capable of continuous working for 24 hours under the standard fire and gas conditions of the test. 3.12 Environmental requirements
3, 12.# Temperature
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SJ20726-1999
The equipment shall be able to work and store at the temperature specified in Table 1. 1
Working temperature
3.12.2 Low pressure
This storage temperature
Working temperature
This storage temperature
Class A equipment shall be able to be installed and operated in high altitude areas under the low pressure specified in Table 2. Table 2
Test pressure
3.12.3 Damp heat
Relative altitude
Test temperature
Sealed equipment should generally be able to withstand the alternating damp heat test specified in Table 3. Table 3
High temperature and high humidity stage
Equipment category
Note: One cycle is 24 bursts,wwW.bzxz.Net
Relative humidity
Test time
Low temperature and high humidity stage
Relative humidity
Temperature stabilization time
Working state
Working non-working
Test cycle
Non-sealed equipment should generally be able to withstand a constant damp heat test with a temperature of 40±2°C, a relative humidity of (93±3)%, and a test time of 96h.
3.12.4 Motion
Class A equipment shall be able to withstand the "Category 8 Land Maneuvering Test" in GJB150.16, and have the ability to maintain the structure and performance intact.
Class B equipment shall be able to withstand the "Category 9 Ship Vibration Test" in GJB150.16, and have the ability to maintain the structure and performance intact.
3.12.5 Shock
Class A equipment shall be able to withstand the impact of half-sine wave, peak acceleration of 300m/s2, and pulse duration of 11ms in "Test 5 Basic Design Test" in GJB150.18, and have the ability to maintain the structure and performance intact. Class B equipment shall be able to withstand the "Test 10 Ship Equipment Impact Test" in GJB150.18, and have the ability to maintain the structure and performance intact.
3.12.6
Class B equipment shall be able to withstand the test specified in GJB4.8, Chapter 2, Level 1, and have the ability to maintain intact structure and performance.
3.12.7
SJ20726--1999
Equipment shall be able to withstand the fungus test environment specified in GJB150.10, and the long burst level shall not exceed Level 2. 3.12.8 Salt spray
Equipment shall be able to withstand the salt spray test environment specified in GJB150.11. 3.13 Reliability
The reliability requirements for the development and production of equipment shall comply with Articles 4.4.3 and 4.4.4 of GJB450. The quantitative reliability requirements of the equipment shall be specified in the contract or product specifications. The minimum acceptable mean time between failures (MIBF) shall not be less than 1000 h.
3.14 Maintainability
The equipment maintainability shall comply with the requirements of 1.6 of GJB367.1 and Chapter 4 of GJB368A. The average fault repair time of the equipment shall generally not exceed 0.5h.
3.15 Electromagnetic compatibility
The electromagnetic compatibility requirements of the equipment can be selected according to the relevant items of GJB151A5.2. Generally: The electromagnetic compatibility of Class A equipment shall comply with the requirements of CE102, CS101, CS114, RE102, and RS103 in GJB151A.
The electromagnetic compatibility of Class B equipment shall comply with the requirements of CE101, CE102, CS101, CS114, CS116, RE101, RE102, RS101, RS103 in GJB151A 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 item described in this specification. 4.1. 1 Responsibility for Conformity
All equipment must comply with all requirements of Chapters 3 and 5 of this specification. The inspections 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 equipment that is known to be defective, nor can the ordering party be required to accept defective equipment. 4.2 Inspection classification
The inspections specified in this specification are divided into:
a. Identification inspection;
b. Quality conformity inspection.
4.3 Inspection conditions
a. Unless otherwise specified, all inspections shall be carried out under the following standard atmospheric conditions: Temperature: 15~35°C:
Relative temperature: 20%80%
Air pressure: Air pressure at the test site.
b. Unless otherwise specified, the actual GPS satellite signal in the air is generally used for testing. When using a GPS signal simulator as the standard test signal source, the signal generated by the GPS signal simulator must have the same characteristics as the GPS satellite signal, including signal-to-noise ratio, SA jitter and geometric factor, etc. 5
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4.4 Identification inspection
4.4.1 Number of samples
SJ 20726-1999
The number of samples for identification inspection shall not be less than two sets in general. 4.4.2 Inspection items
The identification inspection items are shown in Table 4. The inspection items in the table may be increased or decreased appropriately after consultation between the manufacturer and the ordering party. 4.4.3 Qualification criteria
When all inspection items meet the requirements of this specification, the identification inspection is judged to be qualified. If it is found that a certain inspection item does not meet the requirements, the inspection shall be stopped. The manufacturer shall analyze the unqualified items, find out the causes of the defects and take effective corrective measures before continuing the inspection. If all inspection items meet the specified requirements, the identification inspection is judged to be qualified; if there is still a certain item that does not meet the specified requirements after continuing the inspection, it is judged to be unqualified.
4.4.4 Maintenance of Qualification
To maintain the qualification of equipment qualification, the contractor shall provide the equipment test data or qualification certification to the ordering party or the appraisal unit at regular intervals according to the requirements of the ordering party or the appraisal unit. 4.5 Quality consistency inspection
Quality consistency inspection is divided into A, B, C, and D group inspections. Defect classification is specified by product specifications. 4.5. 1 Group A inspection
4.5.1.1 Inspection items
Group A inspection items are shown in Table 4.
4.5.1.2 Inspection plan
Group A inspection adopts piece-by-piece inspection and judgment is made on a piece-by-piece basis. 4.5.1.3 Qualification judgment criteria
When inspecting Group A, the lightest appearance quality defects are allowed, but if any performance index does not meet the requirements, the product will be judged as unqualified.
No fatal defects are allowed in the Group A inspection batch. Once found, the batch will be rejected. 4.5. 1. 4 Re-inspection
For products that fail the Group A inspection, the contractor shall analyze the product, find out the cause of the defect and take effective corrective measures before resubmitting it for inspection. The resubmitted product shall be clearly marked with the "Re-inspection" mark. If the re-inspection is qualified, the product is still considered qualified, otherwise, it is considered unqualified. 4.5.1.5 Sample Processing
Repair the defective products and after they meet the product specifications, they can be treated as Group A qualified products. - 6 -
Design and Structure
Interchangeability
Safety
Dimensions and Weight
Marking and Code
Appearance Quality
Receiving Sensitivity
Acquisition Time
Time and Frequency Signal Stability Time
Positioning Accuracy
Timing Accuracy
Frequency Stability
Frequency Accuracy
Internal Crystal Oscillator Frequency Accuracy
Continuous Working Time
Low Pressure
Reliability
Maintainability
Electromagnetic Compatibility
31 Packaging
SJ 20726—1999
Table 4 Identification and Inspection
Quality I
Conformity Inspection
Note: The symbol "Q" in the table indicates the items to be inspected, "△" indicates the optional items, and "-" indicates the items not to be inspected.
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Inspection Method
Chapter No.
4.7.10.10
4.7.10.11||t t||4.5.2、Group B Inspection
SJ20726—1999
Group B inspection should be conducted on products that have passed Group A inspection. 4.5.2.2 Inspection Items
Group B inspection items are shown in Table 4. According to the specific conditions of the product, Group B inspection items can be incorporated into Group A inspection. 4.5.2.2 Sampling Plan
Unless otherwise specified, sampling inspection shall be conducted in accordance with the relevant provisions of GB179A. Inspection starts with normal inspection and adopts special sampling. For the single sampling plan with inspection level S-2, the acceptable quality level (AOL) is selected from Table 5. Table S
Defect category
Serious defect
Minor defect
4.5.2.3 Qualification criterion
Acceptable quality level (AQL)
According to the inspection results of the sample, if the number of defects found is less than or equal to the qualified judgment number, the batch of Group B is judged to be qualified, otherwise the batch of Group B is judged to be unqualified. 4.5.2.4 Re-inspection| |tt||For the batches that fail the Group B inspection, the contractor shall analyze them, find out the causes of defects and take effective corrective measures before resubmitting them for inspection. During re-inspection, a stricter inspection shall be adopted. If the re-inspection is qualified, the batch is judged to have passed the Group B inspection; if it is still unqualified, the batch shall be rejected. 4.5.2.5 Sample processing
For the batches that pass the Group B inspection, the contractor shall repair and inspect each piece to meet the specified requirements for the samples found to be defective, and then deliver the whole batch according to the contract or order. 4. 5. 3 Group C inspection
The samples for Group C inspection shall be conducted on the products that pass the Group A and Group B inspections. 4. 5. 3. 1 Inspection items
The inspection items for Group C are shown in Table 4.
4.5.3.2 Sampling plan
Unless otherwise specified, the number of test samples shall generally not be less than two units: when the batch is less than five units, one unit may be selected for testing.
4.5.3.3 Qualification Criteria
Unless otherwise specified, the C group inspection allows the slightest appearance defects, and does not allow the product's performance indicators, mechanical damage and other serious defects, otherwise the C group inspection is judged to be unqualified. 4.5.3.4 Inspection Cycle
Unless otherwise specified, a C group inspection shall be conducted once for every three submitted batches, and not less than once a year. If there are major changes in product structure, materials, and processes that may affect the main performance of the product, a C group inspection shall also be conducted.
4.5.3.5 Sample Handling
Unless otherwise specified, samples that have passed the C group inspection shall be refurbished by the contractor and delivered according to the contract or order after passing the A and B group inspections.
4. 5. 4 D group inspection
SJ 20726—1999
D group inspection shall be conducted on products that have passed the A and B group inspections. 4.5.4.1 Inspection Items
Inspection Items for Group D are shown in Table 4
4.5.4.2 Sampling Plan
Randomly select products that have passed the inspection of Group A and Group B. The number of samples shall be determined by negotiation between the ordering party and the contractor or as specified in the contract.
4.5.4.3 Inspection Period
Inspection period for Group D shall be determined by negotiation between the ordering party and the contractor based on the equipment quality stability, production data, etc. 4.5.4.4 Sample Processing
Unless otherwise specified, samples that have passed the inspection of Group D shall be repaired by the contractor, and all components that have exceeded half of their life span and are indeed damaged during the test shall be replaced. After re-inspection of Group A and Group B and pass the inspection, they can be delivered according to the contract or order. 4.5.5 Unqualified
If the sample fails the inspection of Group C or Group D, the acceptance and delivery of the product shall be stopped. The contractor shall notify the appraisal unit of the unqualified situation. After taking effective corrective measures, all tests or inspections shall be re-performed, or only the unqualified items shall be tested or inspected according to the opinions of the appraisal unit. If the re-inspection still fails, the unqualified situation shall be notified to the appraisal unit.
4.6 Packaging inspection
The packaging inspection requirements, inspection items, sampling plan and qualification criteria of the equipment shall be specified by the product specifications. 4.7 Inspection method
4.7.1 Design and structure
Inspect and review according to the design documents and drawings, and verify through appraisal inspection whether the equipment meets the requirements of the task book or contract.
4.7.2 Interchangeability
Replace the interchangeable components or whole parts of one equipment with the corresponding parts of another equipment, check the mechanical and electrical performance, and the equipment should be able to work normally.
4.7.3 Safety
Inspect and review according to the safety design data whether the safety design meets the requirements: When the equipment is working normally, ground the antenna input terminal for 5 minutes, and then perform a protective inspection. The equipment has no permanent damage. 4.7.4 Energy consumption
Measure the power consumption of the equipment with an instrument,
4.7.5 Dimensions and weight
Check with measuring tools and scales.
4.7.6 Color
Check with visual inspection.
4.7.7 Marks and codes
Check with daily measurement.
4.7.8 Appearance quality
Check with self-test.
Check and review according to the software design documents, and verify whether the design meets the task book or contract through identification tests. - 9 -
TKANiKAca-5 Sample processing
For samples found to be defective in the batch that has passed the Group B inspection, the contractor may deliver the whole batch according to the contract or order after repairing and inspecting them piece by piece to meet the specified requirements. 4. 5. 3 Group C inspection
Samples for Group C inspection should be carried out on products that have passed the Group A and Group B inspections. 4. 5. 3. 1 Inspection items
See Table 4 for Group C inspection items.
4.5.3.2 Sampling plan
Unless otherwise specified, the number of test samples is generally not less than two units: when the batch is less than five units, one unit may be selected for testing.
4.5.3.3 Qualification criteria
Unless otherwise specified, the Group C inspection allows the slightest defects in appearance quality, and does not allow serious defects in product performance indicators and mechanical damage, otherwise the Group C inspection will be judged as unqualified. 4.5.3.4 Inspection cycle
Unless otherwise specified, a Group C inspection shall be conducted once for every three submitted batches, and not less than once a year. If there are major changes in product structure, materials, and processes that may affect the main performance of the product, a Group C inspection shall also be conducted.
4.5.3.5 Sample processing
Unless otherwise specified, samples that have passed the Group C inspection shall be refurbished by the contractor and delivered according to the contract or order after passing the Group A and Group B inspections.
4. 5. 4 Group D inspection
SJ 20726—1999
Group D inspection shall be conducted on products that have passed the Group A and Group B inspections. 4.5.4.1 Inspection Items
Inspection Items for Group D are shown in Table 4
4.5.4.2 Sampling Plan
Randomly select products that have passed the inspection of Group A and Group B. The number of samples shall be determined by negotiation between the ordering party and the contractor or as specified in the contract.
4.5.4.3 Inspection Period
Inspection period for Group D shall be determined by negotiation between the ordering party and the contractor based on the equipment quality stability, production data, etc. 4.5.4.4 Sample Processing
Unless otherwise specified, samples that have passed the inspection of Group D shall be repaired by the contractor, and all components that have exceeded half of their life span and are indeed damaged during the test shall be replaced. After re-inspection of Group A and Group B and pass the inspection, they can be delivered according to the contract or order. 4.5.5 Unqualified
If the sample fails the inspection of Group C or Group D, the acceptance and delivery of the product shall be stopped. The contractor shall notify the appraisal unit of the unqualified situation. After taking effective corrective measures, all tests or inspections shall be re-performed, or only the unqualified items shall be tested or inspected according to the opinions of the appraisal unit. If the re-inspection still fails, the unqualified situation shall be notified to the appraisal unit.
4.6 Packaging inspection
The packaging inspection requirements, inspection items, sampling plan and qualification criteria of the equipment shall be specified by the product specifications. 4.7 Inspection method
4.7.1 Design and structure
Inspect and review according to the design documents and drawings, and verify through appraisal inspection whether the equipment meets the requirements of the task book or contract.
4.7.2 Interchangeability
Replace the interchangeable components or whole parts of one equipment with the corresponding parts of another equipment, check the mechanical and electrical performance, and the equipment should be able to work normally.
4.7.3 Safety
Inspect and review according to the safety design data whether the safety design meets the requirements: When the equipment is working normally, ground the antenna input terminal for 5 minutes, and then perform a protective inspection. The equipment has no permanent damage. 4.7.4 Energy consumption
Measure the power consumption of the equipment with an instrument,
4.7.5 Dimensions and weight
Check with measuring tools and scales.
4.7.6 Color
Check with visual inspection.
4.7.7 Marks and codes
Check with daily measurement.
4.7.8 Appearance quality
Check with self-test.
Check and review according to the software design documents, and verify whether the design meets the task book or contract through identification tests. - 9 -
TKANiKAca-5 Sample processing
For samples found to be defective in the batch that has passed the Group B inspection, the contractor may deliver the whole batch according to the contract or order after repairing and inspecting them piece by piece to meet the specified requirements. 4. 5. 3 Group C inspection
Samples for Group C inspection should be carried out on products that have passed the Group A and Group B inspections. 4. 5. 3. 1 Inspection items
See Table 4 for Group C inspection items.
4.5.3.2 Sampling plan
Unless otherwise specified, the number of test samples is generally not less than two units: when the batch is less than five units, one unit may be selected for testing.
4.5.3.3 Qualification criteria
Unless otherwise specified, the Group C inspection allows the slightest defects in appearance quality, and does not allow serious defects in product performance indicators and mechanical damage, otherwise the Group C inspection will be judged as unqualified. 4.5.3.4 Inspection cycle
Unless otherwise specified, a Group C inspection shall be conducted once for every three submitted batches, and not less than once a year. If there are major changes in product structure, materials, and processes that may affect the main performance of the product, a Group C inspection shall also be conducted.
4.5.3.5 Sample processing
Unless otherwise specified, samples that have passed the Group C inspection shall be refurbished by the contractor and delivered according to the contract or order after passing the Group A and Group B inspections.
4. 5. 4 Group D inspection
SJ 20726—1999
Group D inspection shall be conducted on products that have passed the Group A and Group B inspections. 4.5.4.1 Inspection Items
Inspection Items for Group D are shown in Table 4
4.5.4.2 Sampling Plan
Randomly select products that have passed the inspection of Group A and Group B. The number of samples shall be determined by negotiation between the ordering party and the contractor or as specified in the contract.
4.5.4.3 Inspection Period
Inspection period for Group D shall be determined by negotiation between the ordering party and the contractor based on the equipment quality stability, production data, etc. 4.5.4.4 Sample Processing
Unless otherwise specified, samples that have passed the inspection of Group D shall be repaired by the contractor, and all components that have exceeded half of their life span and are indeed damaged during the test shall be replaced. After re-inspection of Group A and Group B and pass the inspection, they can be delivered according to the contract or order. 4.5.5 Unqualified
If the sample fails the inspection of Group C or Group D, the acceptance and delivery of the product shall be stopped. The contractor shall notify the appraisal unit of the unqualified situation. After taking effective corrective measures, all tests or inspections shall be re-performed, or only the unqualified items shall be tested or inspected according to the opinions of the appraisal unit. If the re-inspection still fails, the unqualified situation shall be notified to the appraisal unit.
4.6 Packaging inspection
The packaging inspection requirements, inspection items, sampling plan and qualification criteria of the equipment shall be specified by the product specifications. 4.7 Inspection method
4.7.1 Design and structure
Inspect and review according to the design documents and drawings, and verify through appraisal inspection whether the equipment meets the requirements of the task book or contract.
4.7.2 Interchangeability
Replace the interchangeable components or whole parts of one equipment with the corresponding parts of another equipment, check the mechanical and electrical performance, and the equipment should be able to work normally.
4.7.3 Safety
Inspect and review according to the safety design data whether the safety design meets the requirements: When the equipment is working normally, ground the antenna input terminal for 5 minutes, and then perform a protective inspection. The equipment has no permanent damage. 4.7.4 Energy consumption
Measure the power consumption of the equipment with an instrument,
4.7.5 Dimensions and weight
Check with measuring tools and scales.
4.7.6 Color
Check with visual inspection.
4.7.7 Marks and codes
Check with daily measurement.
4.7.8 Appearance quality
Check with self-test.
Check and review according to the software design documents, and verify whether the design meets the task book or contract through identification tests. - 9 -
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