SJ 20576-1996 General specification for power supply of ship sound reinforcement system
Some standard content:
Military Standard of the Electronic Industry of the People's Republic of China FL6130
SJ20576-96
General specification for power supplies of annoucing system on shipboard
General specification for power supplies of annoucing system on shipboard1996-08-30 Issued
1997-01-01 Implementation
Approved by the Ministry of Electronics Industry of the People's Republic of China Military Standard of the Electronic Industry of the People's Republic of China General specification for power supplies of annoucing system on shipboard
Grneral specification for power supplies of annoucing system on shipboard1 Scope
1.1 Subject Content
This specification specifies the requirements, quality assurance regulations and delivery preparation for power supplies of shipboard sound reinforcement systems. 1.2 Applicable Specifications
SJ 20576-96
This specification applies to low-voltage DC regulated power supplies (hereinafter referred to as power supplies) for shipboard sound reinforcement systems. This specification is the basis for formulating power supply product specifications. | |tt | 150.8—86
GJB 150.9—86
GJB 150.11—-86
GJR 150.16—86
GJB 150.18—-86
GJB 179—86
GJR 367.2—87
GJB 368.2—87
GIR 368.5—87
SI 20365-93
3 Requirements
3.1 Product specifications
Packaging, storage and transportation, graphic symbols
Transport packaging, receiving and shipping labels
Graphic symbols for electrical equipment
Basic dimensions of panels, racks and cabinets Series of environmental test methods for military equipment High temperature test Environmental test methods for military equipment Low temperature test Environmental test methods for military equipment Rain test Environmental test methods for military equipment Condensation test Environmental test methods for military equipment Salt spray test Environmental test methods for military equipment Vibration test Shock test
Military equipment Environmental test methods
Counting sampling inspection procedures and tables
General technical conditions for military communication equipmentEnvironmental test methodsGeneral specifications for equipment maintainabilityBasic requirements for maintainabilityGeneral specifications for equipment maintainability test methodsGeneral specifications for low-voltage DC power supplies
The Ministry of Electronics Industry of the People's Republic of China1996-08-30Issued1997-01-01Implementation
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SJ20576—96
Product performance requirements not specified in this specification shall be specified by the product specification. If the requirements of this specification conflict with those of the product specification, the product specification shall prevail.
3.2 Qualification appraisal
The power supply submitted in accordance with this specification shall be a product that has been qualified or approved for finalization. 3.3 Conditions of use
Unless otherwise specified in the contract or order, the power supply should be able to be used under the following conditions; Temperature: -10~50;
Relative humidity: ≤90%
Atmospheric pressure 86~106kPa
3.4 Appearance quality
The outer surface of the power supply should not have obvious dents, cracks, interlayers, sharp edges, deformations, burrs, etc. The surface coating should not bubble, crack or fall off.
Metal parts should not have rust and other mechanical damage, and the injection should not be out. The operation of the switch, buttons and knobs should be recorded and reliable, and the parts should be tightened without looseness. 3.5 Structure and size
The detailed requirements for the structure of the power supply should be specified in the product specification. For a single unit that can be installed on a rack, its overall dimensions should comply with the provisions of GIB100 and the product specification. 3.6 Weight
The weight of the power supply shall be specified by the product specification.
3.7 Markings and codes
The text and graphic symbols describing the functions shall be clearly, distinctly, correctly and firmly marked, and the graphic symbols used shall comply with the provisions of GB5465.2.
3.8 Interchangeability
The design of the power supply shall ensure the interchangeability of similar products. 3.9 Preferred output voltage series
The preferred series of nominal output voltage of the power supply is: 12.15, 24.30, 36, 48V. 3.10 Performance parameters
The power supply is divided into two categories, I and II, according to the performance parameters. 3.10.1 Load effect (see 4.7.6.1) The load effect of the power supply shall comply with the provisions of Table 1. 3.10.2 Source voltage effect (see 4.7.6.2) The source voltage effect of the power supply shall comply with the provisions of Table 1. 3.10.3 Periodic and random deviation (see 4.7.6.3) The periodic and random deviation of the power supply shall comply with the provisions of Table 1. 3.10.4 Temperature coefficient (see 4.7.6.4) The temperature coefficient of the power supply shall comply with the provisions of Table 1. 3.10.5 Drift (see 4.7.6.5)
The drift of the power supply shall be specified by the product specification.
3.10.6 Load transient effect (see 4.7.6.6) The load transient effect of the power supply shall comply with the provisions of Table 1. 2
SJ 20576 96
3.10.7 Source voltage transient effect (see 4.7.6.7) The source voltage transient effect of the power supply shall comply with the provisions of Table 1. 3.10.8 Output impedance (see 4.7.6.8) The output impedance of the power supply shall be specified by the product specification. 3.10.9 Efficiency (see 4.7.6.9)
The efficiency of the power supply shall be specified by the product specification.
3.10.10 Overcurrent protection (see 4.7.6.10) The overcurrent protection of the power supply shall be specified by the product specification. 3.10.11 Overvoltage protection (see 4.7.6.11) The overvoltage protection of the power supply shall be specified by the product specification. Table 1
Performance parameter name
Load effect
Source voltage effect
Periodic and random deviation
Temperature coefficient
Load transient
Source voltage transient
Transient effect
3.11 Continuous working time
Transient recovery time
Overshoot amplitude
Transient recovery time
Overshoot amplitude
Unless otherwise specified, the power supply should be able to operate normally for 24 hours continuously. 3.12 Safety
3.12.1 Insulation resistance
1×10-4
3×104
Specified by product specifications
Specified by product specifications
Specified by product specifications
Specified by product specifications
Specified by product specifications
The insulation resistance between the input end of the power supply and the casing (when the power switch is in the on position) and between the external live terminals with insulation requirements and the machine shall comply with the requirements of Table 2. 3
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Under normal conditions
3.12.2 Dielectric strength
SJ 2057696
Measure immediately after the damp heat test
between the input terminal of the power supply and the housing (the power switch is in the on position, and between the external live terminals with insulation requirements and the charger) according to the provisions of Table 3, select the test voltage for the dielectric strength test. No isolation or breakdown should occur during the test. Table 3
Working voltage
>60 ~ 120
>120 -240
3.12.3 Leakage current
The leakage current of the power supply should not be less than 5mA.
3.13 Power supply compatibility
The electromagnetic compatibility of the power supply should comply with the provisions of 20365. 3.14 Environmental adaptability
The severity category of the power supply environmental test is specified by the product specification. The main performance parameters that need to be tested after the environmental test include: a. Load effect;
b. Source voltage effect;
c. Cycle and random deviation,
3.14.1 Low temperature storage
Test voltage
The power supply should be able to work after being covered for 24 hours at a temperature of -55℃: after recovery, its appearance, structure and main performance should comply with the provisions of Articles 3.4, 3.5 and 3.10.1~3.10.3 respectively. 3.14.2 Low-temperature working
After the power supply has been operated at a temperature of -107 for 24 hours, its main performance shall comply with the provisions of the product specifications; after recovery, its appearance, structure and main performance shall comply with the provisions of Articles 3.4, 3.5 and 3.10.1~3.10.3 respectively. 3.14.3 High-temperature storage
After the power supply has been stored at a temperature of 65 for 24 hours, it shall be able to work when powered on; after recovery, its appearance, structure and main performance shall comply with the provisions of Articles 3.4, 3.5 and 3.10.1~3.10.3 respectively. 3.14.4 High-temperature working
After the power supply has been operated at a temperature of 50 for 24 hours, its main performance shall comply with the provisions of the product specifications; after recovery, its appearance, structure and main performance shall comply with the provisions of Articles 3.4, 3.5 and 3.10.1~3.10.3 respectively. 3.14.5 Impact
After the power supply has been subjected to the impact test specified in 4.7.10.5, its appearance and structure shall comply with the requirements of Articles 3.4 and 3.5 respectively and be able to operate normally.
3.14.6 Vibration
SJ 20576-96
After the power supply has been subjected to the vibration test specified in Table 4, its appearance, structure and main performance shall comply with the requirements of Articles 3.4, 3.5 and 3.10.1 to 3.10.3 respectively. Table 4
Ship type
Peak acceleration
Pulse width
Pulse repetition frequency
Number of impacts
Note: Class II ships refer to large and medium-sized ships with propeller propeller speeds below 1000r/min; Class II ships refer to small ships with propeller propeller speeds above 1000/min. 3.14.7 Vibration
After the power supply is subjected to vibration test according to the provisions of Table 5, its appearance, structure and main performance shall comply with the provisions of Articles 3.4, 3.5 and 3.10.13.10.3 respectively.
Particle rate rangewwW.bzxz.Net
10 ~ 30 ~ 10
30 ~ 55 - 30
3.14.8 Wet heat
Displacement amplitude
On each axis
Sweep frequency cycle number
The sample should be reported in turn on three mutually perpendicular axes according to the working position
After the power supply is placed at a temperature of 30-60 and a relative humidity of 95% for 120 hours, its appearance, structure and insulation resistance shall comply with the provisions of Article 3.4, Article 3.5 and Table 2 respectively, and can work normally. 3.14.9 Mold
After the power supply is subjected to the mold test of Article 4.7.10.9, its mold growth level shall comply with the product specifications, and its main performance shall comply with the provisions of Articles 3.10.1~-3.10.3. 3.14.10 Salt spray
After the power supply has been subjected to the salt spray test specified in Table 6, its appearance and structure shall comply with the provisions of Articles 3.4 and 3.5 respectively, and shall be able to operate normally.
Concentration%
Weight ratio
3.14.11
Salt spray settling rate
(Take the average value of
over 16h)
Test temperature
35 ±2
Salt spray treatment method
Spray for 24 hours, dry for 24 hours under normal
test atmospheric conditions
, which constitutes
one cycle.
Continuous spray
Test time
After the power supply has been subjected to the rain test of Article 4.7.10.11, it shall mainly comply with the provisions of Articles 3.10.1-~3.10.3. 5
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3.15 Reliability
SI 20576-96
The lower limit value Q of the mean time between failures (MTBF) of the power supply shall be greater than or equal to 2000h. 3.16 Maintainability
The maintainability design of the power supply shall comply with the provisions of GJB368.2. Its maintainability index requirements are specified by the product specifications. 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 Chapters 3 to 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 products that are known to be defective, nor does it allow the ordering party to accept defective products. 4.2 Inspection classification
The inspections specified in this specification are divided into:
a. Qualification inspection:
b. Quality consistency inspection.
4.3 Inspection conditions
Unless otherwise specified, all inspections specified in this specification shall be carried out under the following standard atmospheric conditions: Temperature: 15~35
Relative humidity: 20%-~80%:
Atmospheric pressure: Atmospheric pressure of the test site.
4.4 Qualification inspection
Qualification inspection is generally carried out when the product design and production are finalized, but when there are major changes in the main design, process, components and materials of the product that affect the important performance of the equipment and make the original qualification conclusion no longer valid, qualification inspection should also be carried out. Qualification inspection shall be carried out in a laboratory approved by the ordering party or the superior qualification agency. 4.4.1 Number of samples
The number of samples for qualification inspection shall generally not be less than two sets. For samples of more than two dozen units, they can be tested in groups, and the test items for each group shall be specified in the product specifications. 4.4.2 Inspection items
Identification inspection items shall be in accordance with the provisions of Table 7.
Table 77
External quality
Structure and dimensions
Identification inspection
Quality consistency inspection
Requirements Chapter number
Inspection method
Chapter number
Marking and code
Interchangeability
Performance parameters
Main performance parameters
Continuous working time
Safety
Electromagnetic compatibility
Low temperature storage
Low temperature operation
High overflow storage
High temperature operation
Reliability
Maintainability
Sealing and packaging
Identification inspection
SJ20576-96
Continued Table 7
Quality consistency inspection
Note; ①The symbol “\ in the table indicates a required item; \○\ indicates an optional item; “—\ indicates an unneeded item. ②The safety check in Group A inspection does not include the insulation resistance requirement after the damp heat test. 4.4.3 Qualification criteria
When all inspection items meet the requirements, it is judged to be qualified for the assessment inspection. Requirement Article No.
Inspection Method
Article No.
4.7.10. 0
4.7.10.10
4.7.10.11
If any inspection item does not meet the specified requirements, the inspection shall be suspended. The contractor shall analyze the unqualified items, find out the causes of the defects and take corrective measures before continuing to inspect the unqualified items and related items. If all inspection items meet the specified requirements, the appraisal inspection is still judged to be qualified; if there is still an item that does not meet the specified requirements after continued inspection, the appraisal inspection is judged to be unqualified.
4.4.4 Maintenance of Appraisal Qualification
In order to ensure the appraisal qualification, the contractor shall provide product test data or 7
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qualification demonstration data according to the requirements of the ordering party or the superior appraisal agency.
4.5 Quality consistency inspection
4.5.1 Inspection grouping
SJ 2057696
Quality consistency inspection is divided into A, B, C and D inspection groups. 4.5.2 Formation of inspection lot
The formation of inspection lot shall comply with the provisions of 3.6 of GIB 179. 4.5.3 Group A inspection
4.5.3.1 Inspection items
The inspection items of Group A shall be in accordance with the provisions of Table 7.
4.5.3.2 Arch sampling plan
Group A sampling inspection shall be carried out in accordance with the provisions of GIB 179, using a single sampling plan of general inspection level II, and the acceptable qualified quality level (AQL) shall be in accordance with the provisions of Table 8. The defect classification shall be specified by the product specification. Table 8
Defect classification
Serious defects
Minor defects
4.5.3.3 Qualification criteria
Acceptable quality level (AQI.)
According to the inspection results of the samples, if the defects found are not greater than the qualified judgment number, the batch of products is judged to have passed the Group A inspection, otherwise, it is judged to have failed the Group A inspection.
No fatal defects are allowed in the Group A inspection. If fatal defects are found, the batch of products should be rejected. 4.5.3.4 Re-inspection
For batches that fail the Group A inspection, the contractor should analyze the batch of products, find out the causes of the defects, and take corrective measures before resubmitting for inspection. The resubmitted batch should be separated from the new batch and marked with "resubmitted batch", and stricter inspection should be adopted. If the re-inspection fails, the batch is judged to have passed the Group A inspection; if the re-inspection still does not contain any defects, the batch is judged to have failed the Group A inspection.
4.5.3.5 Handling of Group A inspection samples
If defective products are found in the batches that pass the Group A inspection, the contractor should be responsible for repairing them and meet the requirements of the product specifications before they can be delivered in batches according to the contract or order. 4.5.4 Group B Inspection
Group B inspection shall be conducted on products from the Group A inspection qualified batch. 4.5.4.1 Inspection Items
Group B inspection items shall be in accordance with the provisions of Table 7.
4.5.4.2 Sampling Scheme
Group B sampling inspection shall be conducted in accordance with the provisions of GJB179, using a single sampling scheme of special inspection level S--3, and the acceptable quality level (AQL) shall be in accordance with the provisions of Table 9. Defect classification shall be specified by the product specification. 8
Defect Classification
Severe Defect
Minor Defect
4.5.4.3 Acceptance Criteria
SI 20576-96
Acceptable Quality Level (AQL)
According to the inspection results, if the number of defects found is less than the qualified judgment number, the Group B inspection shall be judged as qualified, otherwise, the Group B inspection shall be judged as unqualified.
4.5.4.4 Re-inspection
For batches that fail the Group B inspection, the contractor shall analyze the batch, find out the cause of the defect, and take corrective measures before resubmitting for inspection. The resubmitted batch shall be separated from the new batch and marked as "resubmitted batch", and stricter inspection shall be adopted.
If the re-inspection is qualified, the batch is still judged to have passed the Group B inspection; if the re-inspection is still unqualified, the batch is judged to have failed the Group B inspection.
4.5.4.5 Handling of Group B inspection samples
For batches that pass the Group B inspection, if defective products are found, the contractor shall be responsible for repairing them and delivering them in batches according to the contract or order after they meet the requirements of the product specifications. 4.5.5 Group C inspection
Group C inspection shall be carried out on the products that pass the Group A and other group inspections. 4.5.5.1 Inspection items
The inspection items of Group C shall be in accordance with the provisions of Table 7.
4.5.5.2 Sampling plan
The sampling inspection of group C shall be carried out in accordance with the provisions of GJB179, and a one-time sampling plan with special inspection level S-1 shall be adopted. The acceptable quality level (AQI.) shall be in accordance with the provisions of Table 10. The defect classification is specified by the product specification. Table 10
Defect classification
Serious defect
Minor defect
4.5.5.3 Acceptance criterion
Acceptable quality level (AQL)
According to the inspection results, if the number of defects found is not greater than the qualified judgment number, the group C inspection is judged to be qualified, otherwise, the group C inspection is judged to be unqualified.
Fatal defects are not allowed in the group C inspection, otherwise the group C inspection is judged to be unqualified. 4.5.5.4 Re-inspection
If the sample fails the group C inspection, the acceptance and delivery of the equipment shall be stopped. The contractor shall notify the qualified inspection unit of the non-conformity. After finding out the cause and taking corrective measures, the sample may be resubmitted for inspection. When resubmitting for inspection, the number of samples shall be increased. All tests or inspections shall be carried out according to the opinion of the qualified inspection unit for re-inspection, or only the non-conforming items shall be tested or inspected.
If the re-inspection is qualified, the batch shall still be judged to have passed the C group inspection; if the re-inspection is still unqualified, the non-conformity shall be notified to the qualified inspection unit.
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4.5.5.5 Sample handling
SJ 20576-96
Unless otherwise specified, the contractor shall repair all the found or potential damages of the samples after the C group inspection, and deliver them according to the contract or order after passing the A and B group inspections. 4.5.5.6 Inspection adjustment
Unless otherwise specified, each submitted batch shall be subject to a C group inspection, but not less than once a year. When the main design, process, components and raw materials of the power supply have major changes that have a major impact on its performance, Group C inspection should also be carried out. 4.5.61) Group inspection
Group D inspection should be carried out on products that have passed the Group A and Group B inspections. 4.5.6.1 Inspection items
Group D inspection items shall be in accordance with the specifications in Table 7.
4.5.6.2 Sampling plan
Group D inspection samples shall be randomly selected from the products that have passed the Group A and Group B inspections, and the number of samples shall be specified by the product specifications.
4.5.6.3 Unqualified
If the sample fails the Group D inspection, the acceptance and delivery of the product shall be stopped. The contractor shall notify the qualified appraisal unit of the unqualified situation. After finding out the cause and taking corrective measures, it can be resubmitted for inspection. If the re-inspection is qualified, the batch of Group D inspection is still judged to be qualified; if the re-inspection is still unqualified, the unqualified situation should be notified to the qualified appraisal unit
4.5.6.4 Sample handling
Unless otherwise specified, the sample contractor who has passed the Group D inspection shall be responsible for repairing and replacing parts that have consumed all or most of the design service life, and can only be delivered according to the contract or order after passing the Group A and Group B inspections. 4.5.6.5 Inspection cycle
The Group D inspection cycle is determined by negotiation between the ordering party and the contractor. However, when there are major changes in the main design, process, components and raw materials of the power supply that have a major impact on its performance, Group D inspection should also be carried out. 4.6 Packaging inspection
4.6.1 Inspection items
The packaging inspection items shall be in accordance with the provisions of Table 7.
4.6.2 Number of samples
Sealing and packaging are carried out according to the identification test on two samples randomly selected; packing and marking are carried out according to the sampling plan of the group A test of the quality-consistency test.
4.6.3 The results of the sealing and packaging inspection shall comply with the provisions of Article 5.1 The results of the packing and marking inspection shall comply with the provisions of Articles 5.2 and 5.4 respectively
4.7 Inspection methods
4.7.1 Appearance quality
Inspect the appearance quality of the power supply by visual inspection and hand feeling. 4.7.2 Structure and size
Inspect the structure of the power supply by visual inspection and hand feeling, and measure the size of the power supply with a measuring tool of corresponding accuracy. 4.7.3 Measurement
Measure the weight of the power supply with a measuring tool of corresponding accuracy. 4.7.4 Marking and code
SJ 20576—96
The marking and code of the power supply product shall be checked by oral measurement. 4.7.5 Interchangeability
Inspect and measure according to the provisions of the product specifications. 4.7.6 Performance parameters
4.7.6.1 Load effect
According to the provisions of Article 4.7.3.2 of SI20365. 4.7.6.2 Source voltage effect
According to the provisions of Article 4.7.3.3 of SI20365. 4.7.6.3 Cycle and random deviation
According to the provisions of Article 4.7.3.4 of SI20365. 4.7.6.4 Temperature coefficient
According to the provisions of Article 4.7.3.5 of SJ20365. 4.7.6.5 Drift
Perform in accordance with 4.7.3.6 of SI20365. 4.7.6.6 Load transient effect
Perform in accordance with 4.7.3.7.1 of SJ20365. 4.7.6.7 Source voltage transient effect
Perform in accordance with 4.7.3.7.2 of SJ20365. 4.7.6.8 Output impedance
Perform in accordance with 4.7.3.8 of SJ20365. 4.7.6.9 Efficiency
Perform in accordance with 4.7.3.10 of S20365. A.7.6.10 Overcurrent protection
Perform in accordance with 4.7.3.11.3.1 of SJ20365. 4.7.6.11 Overvoltage protection
Perform according to the provisions of 4.7.3.11.3.2 of SJ20365. 4.7.7 Continuous working time
Under the conditions of use, the power supply voltage of the power supply equipment is within the working limit, and the power supply should be able to work continuously for 24 hours under normal working conditions.
4.7.8 Safety
4.7.8.1 Insulation resistance
Perform according to 4.7.4 of S20365.1. 4.7.8.2 Electric strength
Perform according to the provisions of Article 4.7.4.2 of SJ20365. 4.7.8.3 Leakage current
Perform according to the provisions of Article 4.7.4.3 of S20365. 4.7.9 Electromagnetic compatibility
Perform according to the provisions of Article 4.7.6 of ST20365. 4.7.10 Environmental adaptability
The sequence of environmental tests shall be carried out in the order of Articles 4.7.10.1 to 4.7.10.11.
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