SJ 20795-2001 General specification for shortwave detection transmitters
Some standard content:
People's Republic of China Electronic Industry Military Standard FL5820
SJ20795—2001
General specification for short wave sound transmitter
General specification for short wave sound transmitter2001-12-27 Issued
2002-01-01 Implementation
Approved by the Ministry of Information Industry of the People's Republic of China Scope
People's Republic of China Electronic Military Industry Standard General Specification for Short Wave Sound Transmitter
General specification for short wave sound transmitter1.1 Subject Content
SJ20795—2001
This specification specifies the requirements, quality assurance regulations, delivery preparation and instructions for short wave sound transmitters (hereinafter referred to as transmitters).
1.2 Scope of Application
This specification applies to short wave sound transmitters used by ground fixed stations. 2 References
GB/T6933—1995 Method for measuring electrical properties of shortwave single sideband transmitters GB9159-88 Safety requirements for radio transmission equipment GJB151A-97 Requirements for electromagnetic emission and sensitivity of military equipment and subsystems GJB152A-97 Requirements for electromagnetic emission and sensitivity measurement of military equipment and subsystems GJB179A-96 Procedures and tables for sampling inspection by counting GJB367.1-87 General technical conditions for military communication equipment, design and manufacturing requirements GJB367.2-87 General technical conditions for military communication equipment Technical conditions Environmental test methods GJB367.3-87 General technical conditions for military communication equipment Reliability identification test and acceptance test methods GJB367.5--87 General technical conditions for military communication equipment Packaging, transportation and storage requirements GJB368A~94 General outline for equipment maintainability GJB2072--94 Maintainability test and evaluation
3 Requirements
General specification for shortwave frequency management and forecasting system 3.1 Qualification
Products submitted in accordance with this specification should be products that have been qualified or approved for finalization. 3.2 Components, parts and materials
The selection of components, parts and materials shall comply with the relevant provisions of Chapter 3 of GJB367.1. 3.3 Design
The design of the transmitter shall comply with the relevant provisions of Chapter 1 of GJB367.1. 3.3.1 Functional characteristics
3.3.1.1 Transmitter working mode
The Ministry of Information Industry of the People's Republic of China issued kAONrKAca on December 27, 2001
Implemented on January 1, 2002
SJ20795-2001
The transmitter working mode is divided into two types: manual and automatic: a. The transmitter can continuously send sweep frequency signals in the 2~16MHz or 230MHz frequency band in a cycle, and can be controlled by start, stop, and reset commands at any time:
b. The transmitter automatically transmits according to the programming regulations, and its program content is specified by the product specifications. 3.3.1.2 Number of transmissions
The transmitter transmits 1 to 12 times per hour, each time for 5 minutes, which can be preset. 3.3.1.3 Scanning rate
When 2～16MHz, the scanning rate is 50kHz/s; when 2～30MHz, the scanning rate is 100kHz/s. 3.3.1.4 Frequency sweep mode
The frequency sweep mode of the transmitter is specified by the product specification. 3.3.1.5 Self-test
The transmitter should have the function of automatic fault detection. 3.3.2 External interface
The RF unbalanced output impedance of the transmitter is 502. 3.4 Maintainability
The qualitative requirements for the maintainability of the transmitter shall comply with the provisions of Article 4.5 of GJB368A, and the average repair time MTTR shall not exceed 15min.
3.5 Interchangeability
The interchangeability of the transmitter shall comply with the requirements of Article 1.7 of GJB367.1. After replacing the same components, assemblies, parts and modules, the transmitter should be able to work normally without adjustment; after a slight adjustment, it should be able to meet the performance characteristics requirements; after the interchange of each unit module, the performance characteristics of the transmitter should meet the requirements. 3.6 Performance characteristics
3.6.1 Frequency stability (see 4.7.6.1) Frequency stability of the transmitter: 5×10-9/d. 3.6.2 Average power (see 4.7.6.2) The average power of the transmitter is divided into 20W and 100W, with an allowable fluctuation of ±3dB. 3.6.3 Spurious narrowband RF components (see 4.7.6.3) The spurious narrowband RF components of the transmitter include harmonic suppression and non-harmonic suppression. Harmonic suppression: -55dB:
Non-harmonic suppression: -50dB.
3.6.4 Scanning linearity (see 4.7.6.4) The scanning linearity of the transmitter is expressed by the scanning time delay resolution, and its value should not be less than 100us. 3.6.5 Frequency range (see 4.7.6.5) The frequency range of the transmitter: 2~30MHz and 2~16MHz. 3.7 Safety
The safety requirements of the transmitter shall comply with the provisions of GB9159. 3.8 Environmental requirements
3.8.1 Temperature
Working temperature: -10℃～45°C:
Storage temperature: -40°℃~60°C.
SJ20795—2001
3.8.2 Vibration
The transmitter shall be able to withstand the alarm test specified by curve V of "409 alarm test" in GJB367.2. 3.8.3 Damp Heat
The transmitter shall be able to withstand the damp heat test specified in Chapter 3 of "411 Damp Heat Test" in GJB367.2. 3.9 Power Consumption
AC power supply: (220+10%)V, (50±2)Hz, power consumption is specified by the product specification 3.10 Electromagnetic Compatibility
The electromagnetic compatibility of the transmitter shall comply with the requirements specified in GJB151A, and the specific test items shall be specified by the product specification. 3.11 Dimensions and Weight
The dimensions and weight of the transmitter shall be specified in the product specification. 3.12 Color and Surface Condition
The color, surface processing and plating of the transmitter shall comply with the provisions of Articles 1.20, 2.5 and 2.6 of GJB367.1. 3.13 Marking
The marking of the transmitter shall comply with the provisions of Article 1.21 of GJB367.1. 3.14 Appearance quality
The transmitter surface should be free of rust, mildew, coating peeling, scratches, burrs: plastic parts should be free of blistering, cracking, deformation; text, symbols, and signs should be clear: structural parts and control components should be complete and free of mechanical damage. 3.15 Continuous working time
The continuous working time of the transmitter shall not be less than 24h. 3.16 Reliability
The mean time between failures (MTBF) of the transmitter shall not be less than 1000h. 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 the specification. 4.1.1 Qualification responsibility
All products must meet all requirements of Chapter 3 and Chapter 5 of the 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 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. Identification inspection;
b. Quality consistency inspection.
4.3 Inspection conditions
Unless otherwise specified, the inspection conditions shall be in accordance with 2.1. of GJB367.2.1 stipulates various inspections. 3
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Qualification inspection
SJ20795—2001
Qualification inspection is generally carried out when the product design and production are finalized. When there are major changes in the main design, process, components and materials of the product that affect the important performance of the product and make the original qualification results no longer valid, qualification inspection should also be carried out. Qualification inspection should be carried out in a laboratory approved by the ordering party or the superior qualification agency. Inspection items
Qualification inspection items are shown in Table 1.
Inspection or test items
Components, parts and materials
Maintainability
Interchangeability
Frequency stability
Output power
Spurious narrowband RF classification
Scanning linearity
Frequency range
Safety
Power consumption
Electromagnetic compatibility
Dimensions and weight
Color and surface condition
Appearance quality
Continuous working time
Reliability
Required
Chapter number
Inspection or test
Method number
Note: In the table, "○" means mandatory items; "" means optional items and "-" means no items. 4.4.2 Inspection samples
Quality consistency inspection
The identification inspection samples must be products that have passed the inspection of the quality inspection department of the contractor and have complete inspection records. The number of samples is generally 2 sets.
4.4.3 Qualification criteria
When all inspection items meet the requirements of Chapter 3 and Chapter 5, the identification inspection is considered qualified. If any inspection item does not meet the requirements specified in Chapter 3 and Chapter 5 due to poor design or workmanship, the inspection should be suspended. The contractor should analyze the unqualified items, find out the causes of the defects and take corrective measures, and then continue to inspect the unqualified items and related items. If all inspection items meet the specified requirements, the identification inspection is still considered qualified: If there is still an item that does not meet the specified requirements after continuing the inspection, the identification inspection is considered unqualified.
4.4.4 Maintenance of qualification for inspection and appraisal
To maintain the qualification for inspection and appraisal, the contractor shall provide product test data regularly according to the requirements of the superior appraisal agency. 4.5 Quality consistency inspection
4.5.1 Inspection grouping
Quality consistency inspection is divided into Group A, Group B, Group C and Group D inspection. 4.5.2 Formation of inspection batch
The formation of inspection batch shall comply with the provisions of Article 5.4.6 of GJB179A. 4.5.3 Group A inspection
4.5.3.1 Inspection items
The inspection items of Group A are shown in Table 1.
4.5.3.2 Sampling plan
One hundred percent of the inspection batch products submitted by the contractor shall be subject to Group A inspection. The batch quality of Group A inspection is expressed by the number of defects per hundred units of products. The acceptable number of defects per 100 units of products shall be agreed upon by the contractor and the ordering party or the following values shall be selected: number of serious defects: 10, 15, 25;
number of minor defects: 40, 65, 100.
The specific acceptable number of defects per 100 units of products shall be specified in the product specification or contract. 4.5.3.3 Defect classification
See 4.8 for defect classification.
4.5.3.4 Acceptance criteria
Based on the inspection results, calculate the number of defects per 100 units of products. If it is equal to or less than the specified acceptable value, the batch of Group A is deemed to have passed the inspection. Otherwise, the batch of Group A is deemed to have failed the inspection. 4.5.4 Group B inspection
4.5.4.1 Inspection items
The inspection items of Group B are shown in Table 1.
4.5.4.2 Sampling Plan
Samples for Group B inspection shall be randomly selected from qualified batches inspected by Group A. Sampling inspection of Group B shall be carried out in accordance with the relevant provisions of GJB179A, and a normal sampling plan of special inspection level S-3 shall be adopted. The acceptable quality level (AQL) of consecutive batches shall be selected from the following values:
Severe defect AQL: 4.0, 10, 15;
Minor defect AQL: 25, 40, 65;
The specific value of AQL shall be specified by the product specification or contract. The corresponding limit quality (LQ) value of the isolated batch shall be specified in the contract in accordance with Article 5.5 of GJB179A. 4.5.4.3 Qualification Criteria
.·According to the test results, if fatal defects are found in the samples, the batch of products is judged to be unqualified in the Group B test: If the number of defects in the samples is not greater than the qualified judgment number, the batch of products is judged to be qualified in the Group B test: Otherwise, the batch of products is judged to be unqualified in the Group B test. 5
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SJ20795--2001
Fateful defects are not allowed in the Group B test. Once fatal defects are found, the batch is judged to be unqualified. 4.5.4.5 Re-inspection
For batches that fail the Group B test, the contractor shall analyze the batch of products, find out the causes of the defects and take corrective measures, and then resubmit for inspection. During re-inspection, the resubmitted batch shall be separated from the new batch, and marked with "resubmitted batch", and stricter inspection shall be adopted.
If the re-inspection is qualified, the batch of Group B inspection is still judged to be qualified: If the re-inspection is still unqualified, the batch of Group B inspection is judged to be unqualified. 4.5.5 Group A and Group B Inspection Sample Processing
The defective products in the batch that have passed the Group A and Group B inspections shall be repaired by the contractor and meet the requirements of the product specifications before they can be delivered in batches according to the contract or order. 4.5.6 Group C Inspection
4.5.6.1 Inspection Items
The inspection items of Group C are shown in Table 1.
4.5.6.2 Sampling Plan
The samples for Group C inspection shall be randomly selected from the qualified sample batches that have passed the Group A and Group B inspections. The sampling plan for Group C inspection is: when the batch is not more than 8 sets, one set is selected; when the batch is between 9 and 150 sets, two sets are selected; when the batch is more than 150 sets, three sets are selected.
4.5.6.3 Qualification Criteria
When conducting Group C inspection, if all inspection items meet the requirements of product specifications, the Group C inspection is considered qualified. If any inspection item does not meet the requirements of product specifications, the Group C inspection is considered unqualified. 4.5.6.4 New Inspection
If the product fails the Group C inspection, the acceptance and delivery of the product shall be stopped. The contractor shall notify the ordering party or the superior appraisal agency of the unqualified situation. After finding out the cause and taking corrective measures, it can be resubmitted for inspection. The re-inspection shall be carried out according to the opinions of the ordering party or the superior appraisal agency. All tests or inspections shall be carried out, or only the unqualified items shall be tested or inspected. If the re-inspection is qualified, the Group C inspection is considered qualified: if the re-inspection is still unqualified, the Group C inspection is considered unqualified. 4.5.6.5 Sample Processing
Unless otherwise specified, the samples that have passed the Group C inspection can be delivered according to the contract or order after the contractor repairs the discovered or potential damage and passes the Group A and Group B inspections. 4.5.6.6 Inspection cycle
In any of the following situations, the submitted products shall be subject to Group C inspection: a. Isolated batch:
b. The first submitted batch of each production batch of a continuous batch and the subsequent submitted batch every 6 months; C. When there are major changes in the structure, materials, process, etc. of the product, which may affect the product performance. 4.5.7 Group D inspection
4.5.7.1 Inspection items
The inspection items are shown in Table 1.
4.5.7.2 Sampling plan
The Group D inspection shall be randomly selected from the samples of the qualified batches of Group A and Group B inspections, and the number of samples shall be specified by the product specifications. 4.5.7.3 Sample handling
Unless otherwise specified, for samples that have passed the D group inspection, the contractor shall be responsible for repairing and replacing parts that have consumed all or most of the design service life. After passing the A and B group inspections, they can be delivered according to the contract or order. 4.5.7.4 Inspection cycle
In any of the following situations, the company shall conduct a D group inspection on the submitted products: e. After the product is officially put into production, if there are changes in the design, process, materials and key components that affect the product quality; b. When the contract or order requires a D group inspection. 4.5.8 Unqualified
If the sample fails to pass the C or D group inspection, the acceptance and delivery of the product shall be stopped, and the contractor shall notify the superior appraisal agency of the unqualified situation. After taking corrective measures, all tests or inspections shall be carried out again according to the opinions of the superior appraisal agency, or only the unqualified items shall be tested or inspected. If the test still fails, the unqualified situation should be notified to the qualified appraisal agency. 4.6 Packaging inspection
shall be carried out in accordance with the relevant provisions of GJB367.5.
4.7 Inspection methods
4.7.1 General requirements
4.7.1.1 Test conditions
Unless otherwise specified, all inspections specified in this specification shall be carried out under the environmental conditions specified in Article 4.3 and the power supply conditions specified below:
AC power supply: (220±2%)V, (50±2%)Hz. 4.7.1.2 Measuring instruments and test equipment
The accuracy of the measuring instruments shall be able to meet the accuracy requirements of the measured performance indicators and be within the period of metrological verification. The test equipment shall be able to provide the conditions required for the test, and during the test, the test equipment shall maintain the specified accuracy. 4.7.2 General inspection
The following aspects shall be measured or visually inspected using measuring tools in accordance with the product design drawings and documents: components, parts and materials (see 3.2): a.
b. Dimensions and weight (see 3.11): c. Color and surface condition (see 3.12); d. Marking (see 3.13); . Appearance quality (see 3.14).
4.7.3 Design
Inspect and review the design drawings and documents in accordance with the requirements of Chapter 1 of GJB367.1. Inspect the functional characteristics of the product in accordance with the operating instructions of the product technical manual. 4.7.4 Maintainability
Perform in accordance with the provisions of GJB2072.
4.7.5 Interchangeability
Replace components, assemblies, parts and modules with the same function and check that the product can work normally. After a slight adjustment, the performance characteristics should meet the requirements.
4.7.6 Performance characteristics
4.7.6.1 Frequency stability
Frequency stability shall be measured in accordance with Article 6.16 of GB/T6933. 7
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4.7.6.2 Average power
SJ20795-2001
Average power shall be measured in accordance with Article 6.1 of GB/T6933. 4.7.6.3 Spurious narrowband RF components
Spurious narrowband RF components shall be measured in accordance with Article 6.19 of GB/T6933. 4.7.6.4 Scanning linearity
Scanning linearity shall be measured in accordance with Article 4.7.12.2.5 of GJB "General Specifications for Shortwave Frequency Management and Forecasting Systems". 4.7.6.5 Frequency range
At the highest and lowest frequencies of the specified frequency range of the transmitter, measure the average power in accordance with 4.7.6.3, and the result shall comply with the provisions of 3.6.5.
4.7.7 Safety
Inspect in accordance with the requirements of GB9159.
4.7.8 Environmental test
The test sequence shall be in accordance with the provisions of Appendix D of GJB367.2. 4.7.8.1 Low temperature test
The low temperature test shall be carried out in accordance with the provisions of Chapter 4 of "401 Low temperature test" of GJB367.2. The initial test, intermediate test and final test items shall be specified by the product specification.
4.7.8.2 High temperature test
The high temperature test shall be carried out in accordance with the provisions of Chapter 4 of "402 Low temperature test" of GJB367.2. The initial test, intermediate test and final test items shall be specified by the product specification.
4.7.8.3 Vibration test
The vibration test shall be carried out in accordance with the provisions of Article 5.1 of "409 Low Temperature Test" in GJB367.2. The initial test and final test items shall be specified by the product specifications.
4.7.8.4 Damp heat test
The damp heat test shall be carried out in accordance with the provisions of Article 4.1 of "411
Damp heat test" in GJB367.2. The initial test, intermediate test and final test items shall be specified by the product specifications.
4.7.9 Power consumption
Measure the AC input power of the transmitter with an AC power meter. 4.7.10 Electromagnetic compatibility
The electromagnetic compatibility test shall be carried out in accordance with the provisions of GJB152A. 4.7.11 Continuous working time
The transmitter shall work continuously for 24 hours at rated voltage to measure whether its performance characteristics are normal. 4.7.12 Reliability test
Reliability test shall be carried out in accordance with GJB367.3. Test plan, test stress conditions and procedures, failure classification and qualification criteria shall be specified by product specifications.
4.7.13 Packaging test
Packaging test shall be carried out in accordance with Chapter 5 of GJB367.5. 4.8 Defect classification
According to Article 3.10 of GJB179A, defects can be divided into three categories: fatal defects, serious defects and minor defects. 8
4.8.1 Fatal defects
SJ20795--2001
Defects that can destroy equipment and endanger the lives of users. 4.8.2 Serious defects
Frequency lock or loss of specified functions:
In all performance characteristic test items, the parameters exceed the limits required by this specification: b.
The fuse blows three times in a row:
d.The outer surface of the product has large-area coating peeling, rust, scratches, burrs, blistering, cracking and other phenomena, and the product logo falls off; e. The structure and size do not meet the requirements of the product design documents. 4.8.3 Minor defects
The product appearance is not neat and has slight mechanical damage, but it does not affect the mechanical strength and service life: the marking color is not bright, a.
or there are stains, but it can be identified: the outer shell is worn so that the bottom metal is exposed or a small amount of coating peels off: b. The fuse blows no more than twice in a row. Delivery preparation
Unless otherwise specified in the contract, the packaging, transportation, storage and marking requirements of the equipment shall comply with the provisions of Chapter 1 to Chapter 4 of GJB367.5.
6 Notes
6.1 Intended use
The shortwave detection transmitter is intended for use in the shortwave frequency management and forecasting system. . 6.2 Contents of order documents
The following contents shall be stated in the contract or order: a. The name and content of this specification:
b. Type;
Equipment model:
d. Quantity:
e. Sealing, packaging and packing level.
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 State-owned No. 713 Factory. The main drafters of this specification: Luo Yiwen and Chen Shuyan. Project code: B83002.
riKAoNiKAca-5 Frequency range
At the highest and lowest frequencies of the specified frequency range of the transmitter, measure the average power in accordance with 4.7.6.3, and the result shall comply with 3.6.5.
4.7.7 Safety
Inspect in accordance with the requirements of GB9159. bzxZ.net
4.7.8 Environmental test
The test sequence shall be in accordance with the provisions of Appendix D of GJB367.2. 4.7.8.1 Low temperature test
The low temperature test shall be carried out in accordance with the provisions of Chapter 4 of "401 Low temperature test" of GJB367.2. The initial test, intermediate test and final test items shall be specified by the product specification.
4.7.8.2 High temperature test
The high temperature test shall be carried out in accordance with the provisions of Chapter 4 of "402 Low temperature test" of GJB367.2. The initial test, intermediate test and final test items shall be specified by the product specification.
4.7.8.3 Vibration test
The vibration test shall be carried out in accordance with the provisions of Article 5.1 of "409 Low Temperature Test" in GJB367.2. The initial test and final test items shall be specified by the product specifications.
4.7.8.4 Damp heat test
The damp heat test shall be carried out in accordance with the provisions of Article 4.1 of "411
Damp heat test" in GJB367.2. The initial test, intermediate test and final test items shall be specified by the product specifications.
4.7.9 Power consumption
Measure the AC input power of the transmitter with an AC power meter. 4.7.10 Electromagnetic compatibility
The electromagnetic compatibility test shall be carried out in accordance with the provisions of GJB152A. 4.7.11 Continuous working time
The transmitter shall work continuously for 24 hours at rated voltage to measure whether its performance characteristics are normal. 4.7.12 Reliability test
Reliability test shall be carried out in accordance with GJB367.3. Test plan, test stress conditions and procedures, failure classification and qualification criteria shall be specified by product specifications.
4.7.13 Packaging test
Packaging test shall be carried out in accordance with Chapter 5 of GJB367.5. 4.8 Defect classification
According to Article 3.10 of GJB179A, defects can be divided into three categories: fatal defects, serious defects and minor defects. 8
4.8.1 Fatal defects
SJ20795--2001
Defects that can destroy equipment and endanger the lives of users. 4.8.2 Serious defects
Frequency lock or loss of specified functions:
In all performance characteristic test items, the parameters exceed the limits required by this specification: b.
The fuse blows three times in a row:
d.The outer surface of the product has large-area coating peeling, rust, scratches, burrs, blistering, cracking and other phenomena, and the product logo falls off; e. The structure and size do not meet the requirements of the product design documents. 4.8.3 Minor defects
The product appearance is not neat and has slight mechanical damage, but it does not affect the mechanical strength and service life: the marking color is not bright, a.
or there are stains, but it can be identified: the outer shell is worn so that the bottom metal is exposed or a small amount of coating peels off: b. The fuse blows no more than twice in a row. Delivery preparation
Unless otherwise specified in the contract, the packaging, transportation, storage and marking requirements of the equipment shall comply with the provisions of Chapter 1 to Chapter 4 of GJB367.5.
6 Notes
6.1 Intended use
The shortwave detection transmitter is intended for use in the shortwave frequency management and forecasting system. . 6.2 Contents of order documents
The following contents shall be stated in the contract or order: a. The name and content of this specification:
b. Type;
Equipment model:
d. Quantity:
e. Sealing, packaging and packing level.
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 State-owned No. 713 Factory. The main drafters of this specification: Luo Yiwen and Chen Shuyan. Project code: B83002.
riKAoNiKAca-5 Frequency range
At the highest and lowest frequencies of the specified frequency range of the transmitter, measure the average power in accordance with 4.7.6.3, and the result shall comply with 3.6.5.
4.7.7 Safety
Inspect in accordance with the requirements of GB9159.
4.7.8 Environmental test
The test sequence shall be in accordance with the provisions of Appendix D of GJB367.2. 4.7.8.1 Low temperature test
The low temperature test shall be carried out in accordance with the provisions of Chapter 4 of "401 Low temperature test" of GJB367.2. The initial test, intermediate test and final test items shall be specified by the product specification.
4.7.8.2 High temperature test
The high temperature test shall be carried out in accordance with the provisions of Chapter 4 of "402 Low temperature test" of GJB367.2. The initial test, intermediate test and final test items shall be specified by the product specification.
4.7.8.3 Vibration test
The vibration test shall be carried out in accordance with the provisions of Article 5.1 of "409 Low Temperature Test" in GJB367.2. The initial test and final test items shall be specified by the product specifications.
4.7.8.4 Damp heat test
The damp heat test shall be carried out in accordance with the provisions of Article 4.1 of "411
Damp heat test" in GJB367.2. The initial test, intermediate test and final test items shall be specified by the product specifications.
4.7.9 Power consumption
Measure the AC input power of the transmitter with an AC power meter. 4.7.10 Electromagnetic compatibility
The electromagnetic compatibility test shall be carried out in accordance with the provisions of GJB152A. 4.7.11 Continuous working time
The transmitter shall work continuously for 24 hours at rated voltage to measure whether its performance characteristics are normal. 4.7.12 Reliability test
Reliability test shall be carried out in accordance with GJB367.3. Test plan, test stress conditions and procedures, failure classification and qualification criteria shall be specified by product specifications.
4.7.13 Packaging test
Packaging test shall be carried out in accordance with Chapter 5 of GJB367.5. 4.8 Defect classification
According to Article 3.10 of GJB179A, defects can be divided into three categories: fatal defects, serious defects and minor defects. 8
4.8.1 Fatal defects
SJ20795--2001
Defects that can destroy equipment and endanger the lives of users. 4.8.2 Serious defects
Frequency lock or loss of specified functions:
In all performance characteristic test items, the parameters exceed the limits required by this specification: b.
The fuse blows three times in a row:
d.The outer surface of the product has large-area coating peeling, rust, scratches, burrs, blistering, cracking and other phenomena, and the product logo falls off; e. The structure and size do not meet the requirements of the product design documents. 4.8.3 Minor defects
The product appearance is not neat and has slight mechanical damage, but it does not affect the mechanical strength and service life: the marking color is not bright, a.
or there are stains, but it can be identified: the outer shell is worn so that the bottom metal is exposed or a small amount of coating peels off: b. The fuse blows no more than twice in a row. Delivery preparation
Unless otherwise specified in the contract, the packaging, transportation, storage and marking requirements of the equipment shall comply with the provisions of Chapter 1 to Chapter 4 of GJB367.5.
6 Notes
6.1 Intended use
The shortwave detection transmitter is intended for use in the shortwave frequency management and forecasting system. . 6.2 Contents of order documents
The following contents shall be stated in the contract or order: a. The name and content of this specification:
b. Type;
Equipment model:
d. Quantity:
e. Sealing, packaging and packing level.
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 State-owned No. 713 Factory. The main drafters of this specification: Luo Yiwen and Chen Shuyan. Project code: B83002.
riKAoNiKAca-
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