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FL5830, Military Standard of the Electronic Industry of the People's Republic of China
SJ 20738—1999
General specification for wired talk-back system on shipboard
Published on November 10, 1999
Implemented on December 1, 1999
Approved by the Ministry of Information Industry of the People's Republic of China Military Standard of the Electronic Industry of the People's Republic of China General specification for wired talk-back system on shipboard
General specification for wired talk-back system on shipboard1 Scope
1.1 Subject Content
SJ 20738—1999
This specification specifies the requirements, quality assurance provisions and delivery preparation for shipboard wired talk-back systems. 1.2 Scope of Application
This specification applies to the wired talk-back system equipment (hereinafter referred to as talk-back equipment) for issuing calls and command information on ships.
2 Reference documents
GB191—90 Pictorial symbols for packaging, storage and transportation
GB148979 Protection level of motor and low-voltage electrical enclosuresGR/T5465.2—1996 Graphic symbols for electrical equipmentGB6388--86 Transport packaging delivery and receipt marksGB9001-89 Audio amplifier measurement method
GJB10086 Basic dimension series for panels, racks and cabinetsGJB150.3--86 Environmental test methods for military equipmentHigh temperature test Environmental test methods for military equipmentLow temperature testGJB 150.4-86
Environmental test methods for military equipmentRain testGJB 150.8—86
GJB150.9--86 Environmental test methods for military equipment Wet heat test GJB150.11—86
Environmental test methods for military equipment Salt test 5 Environmental test methods for military equipment Vibration test GJB150.16—86
6 Environmental test methods for military equipment Impact test GJB 150.1886
Requirements for electromagnetic emission sensitivity of military equipment and subsystems GJB 151A—96
GJB152A-96 Measurement of electromagnetic emission and sensitivity of military equipment and subsystems GJB179A—96 Counting sampling inspection procedures and tables GJB367.2--87 General technical conditions and environmental test methods for military communication equipment GJB368.2--87 General specification for equipment maintainability Basic requirements for maintainability GIB368.5-87 General specification for equipment maintainability Test and evaluation of maintainability SJ/T10406—93 General technical conditions for audio power amplifiers Issued by the Ministry of Information Industry of the People's Republic of China on November 10, 1999 TiiKAoNrKAca
Implementation on December 1, 1999
3 Requirements
3.1 Product specifications
SJ 20738-1999
The equipment should comply with the provisions of this specification and the corresponding product specifications. If this specification conflicts with the requirements of the product specification, the product specification shall prevail.
32 Qualification Appraisal
The intercom equipment submitted in accordance with this specification shall be a product that has been qualified or approved for finalization. 3.3 Composition and Classification
The intercom system shall generally consist of a host, an auxiliary machine (or a remote control device), an extension and a control device (DC regulated power supply). The specific composition of the system is specified by the product specification. Intercom equipment is divided into two categories according to its structural form: wall-mounted and embedded. The connection of intercom equipment is shown in Figure 1. Guangfu
(remote control device)
Megaphone
3.4 Conditions of use
Control box
(DC regulated power supply)
Extension】
Extension 2
Extension n
Unless otherwise specified in the contract or order, the intercom equipment should be able to work normally under the following conditions: Temperature: -30～60°C (weatherproof equipment used outside the cabin); -10～55°C (equipment inside the cabin);
Relative humidity: ≤93%:
Air pressure: 86106kPa:
Environmental noise: main engine ≤90dB, auxiliary engine ≤85dB; extension inside the cabin ≤85dB, extension outside the cabin ≤90 dB or ≤110dB (during the soundproof cover). AC power supply: 220V±10%, 50Hz±5%; DC power supply: 24V+15%.
3.5 Appearance quality
The outer surface of the intercom equipment should not have obvious dents, cracks, deformations, burrs, etc. The surface coating should not bubble, crack or fall off.
Metal parts should not have rust and other mechanical damage, and injection should not overflow. The operation of switches, buttons and knobs should be flexible and reliable, and the parts should be tightened without looseness. The text, graphic symbols, signs and codes describing the functions should be clear and firm, and the graphic symbols used should comply with the provisions of GB5465.2.
3.6 Structure and size
SJ 20738-1999
Unless otherwise specified, the intercom host, extension and control box are all wall-mounted, and the detailed requirements for the structure and size of other equipment should comply with the provisions of the product specifications. For equipment that can be installed on the rack, its dimensions shall comply with the provisions of GJB100 and product specifications. 3.7 Weight
The weight of the intercom equipment shall be specified in the product specifications. 38 Installation
When installing the intercom equipment, a twisted pair communication cable with an outer shield shall be used, and the cross-sectional area of the core wire shall not be less than 0.5mm2. The cable screen shall be reliably grounded. The power cord and the extension cord shall be routed separately to avoid interference. When the outer shell of the equipment outside the cabin is made of metal material, the outer shell shall be reliably grounded through the grounding screw. 39 Protection performance
391 The protection performance of the outer shell of the embedded host, auxiliary machine and extension machine shall comply with the requirements of [P20. 392 The protection performance of the outer shell of the wall-mounted host and extension machine, the cabin extension machine and the DC power supply shall comply with the requirements of IP22. 3.93 The protection performance of the outer shell of the windproof auxiliary machine and extension machine used outside the cabin shall comply with the requirements of P56. 310 Function
The simplex or duplex system adopted by the equipment shall be specified in the product specifications. The intercom system should have the following functions at least. Other additional functions are specified by the product specifications: a. Host priority call:
b. Two-way intercom:
c. Sound reinforcement (shouting).
311 Interchangeability
The design of the product should ensure the interchangeability of similar products. The connectors used for each terminal of the system equipment and the distribution of their contacts are specified by the product specifications.
3.12 System intercom requirements
3.12.1 The calling tone should be an intermittent tone of 800-1000Hz, with the disconnection and connection time of 0.5s respectively. The output voltage of the calling tone signal after amplification by the host amplifier is specified by the product specifications. 312.2 The maximum number of extensions that the host can call at the same time is specified by the product specifications, and there should be a corresponding display when the calling tone is between the host and the extension.
The host and the extension can use the built-in loudspeaker or an external handheld telephone for intercom; in a high-noise environment, an external anti-noise headset should be used for intercom and an external flasher should be connected. The flashing frequency and continuous flashing time of the flasher shall be specified by the product specification.
3123 The extension should be able to call the host and the auxiliary at the same time. The extension call loop current shall be specified by the product specification. When the speaker in the extension is used for both sending and receiving calls, the distance for the best answering effect shall be specified in the product specification. 3124 The host and the auxiliary should be able to talk to each other. Both the host and the auxiliary should be able to be called by the built-in loudspeaker, and there should be an indication. When the host and the auxiliary use the handheld switch telephone to send calls and the built-in speaker to receive calls, the volume should be continuously adjustable. 3125 If required in the contract or order, the system can also be connected to an external horn speaker and left and right telephones for external communication:
312.6 Under the environmental noise conditions specified in Article 3.4, the various control functions of the system should be normal, and the equipment should be able to communicate normally according to the provisions of the product specifications. 313 Equipment performance parameters
3131 The electrical performance of the system power amplifier shall comply with the provisions of Table 1. -3-
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SJ 20738--1999
3.13.2 The DC input characteristics of the control box shall be specified by the product specifications 3.13.3 The performance of the system call tone signal generator shall be specified by the product specifications 3.13.4 The DC regulated power supply shall be able to provide overcurrent and overvoltage protection, alarm, and automatically switch to the backup battery pack in the event of power outage or failure.
Performance parameters
Effective frequency range of gain limitation
Frequency response
Total harmonic distortion
Noise level
Distortion-limited output power
Maximum output power
Signal-to-noise ratio
(A-weighted)
Output voltage regulation
3.14 Continuous working time
300~3400
Specified by product specifications
Specified by product specifications
400 Hz:≤2.5
4 000 Hz:≤3
Unless otherwise specified, the intercom equipment shall be able to operate normally for 48 hours continuously. 3.15 Durability
3.15.1 Load short-circuit protection
Measurement conditions
Normal working conditions
Normal working conditions, UdB at 1000Hz
Rated conditions, normal working conditions
Normal working conditions
Rated conditions
Distortion is 10%
Low impedance microphone input
Line input
Normal working conditions
When the load is short-circuited, the power amplifier should be able to automatically protect itself, and after the short-circuit state is eliminated, it should be able to automatically resume normal operation immediately.
3.15.2 Load open-circuit protection
When the load is open-circuited, the power amplifier should be able to withstand it without damage. 3.15.3 Input surge protection
The power amplifier working under rated conditions should be able to withstand a surge of 30dB increment of the rated source electromotive force. 3.16 Environmental adaptability
a. The severity category of the environmental test for intercom equipment is specified by the product specification. b. The main performance parameters of the host power amplifier tested after the environmental test should include: total harmonic distortion:
distortion-limited output power,
signal-to-noise ratio:
output voltage regulation rate.
C. The main performance parameters of other equipment tested after the environmental test are specified by the product specification. 3.16.1 Low-temperature storage
The intercom equipment is placed at a temperature of -55\C for 24 hours; after recovery, its appearance, structure and main performance should comply with the provisions of Articles 3.5, 3.6 and the product specification respectively. 3.16.2 Low temperature operation
The intercom equipment is operated for 24 hours at a temperature of -30°C (outboard equipment) or 10°C (inboard equipment). After recovery, its appearance, structure and main performance shall comply with the provisions of Articles 3.5, 3.6 and product specifications. 3.16.3 High temperature storage
The intercom equipment is placed at a temperature of 65°C for 48 hours. After recovery, its appearance, structure and main performance shall comply with the provisions of Articles 3.5, 3.6 and product specifications. 3.16.4 High temperature operation
The intercom equipment is operated for 24 hours at a temperature of 60°C (outboard equipment) or 55°C (inboard equipment). After recovery, its appearance, structure and main performance shall comply with the provisions of Articles 3.5, 3.6 and product specifications. 3.16.5 Impact
After the intercom equipment has been subjected to the impact test specified in 4.7.10.5, its appearance and structure shall comply with the provisions of Articles 3.5 and 3.6 respectively and shall be able to operate normally.
3.16.6 Vibration
After the intercom equipment has been subjected to the vibration test specified in Table 2, its appearance, structure and main performance shall comply with the provisions of Articles 3.5, 3.6 and the product specifications respectively.
Ship type
Peak acceleration
Pulse width
Pulse repetition frequency
Number of impacts
Note: Category 1 ships refer to large and medium-sized ships with propeller propeller speeds below 1000T/min; Category IⅡ ships refer to small ships with propeller propeller speeds above 1000 r/min. 3.16.7 Vibration
After the intercom equipment is subjected to vibration test according to the provisions of Table 3, its appearance, structure and main performance shall comply with the provisions of Article 3.5, Article 3.6 and product specifications respectively.
Frequency range
10~~30~10
30~55~30
3.16.8 Damp heat
Position amplitude
On each axis
Number of frequency sweep cycles
The sample shall be vibrated in three mutually perpendicular axes in turn according to the working position
After the intercom equipment is left for 120 hours at a temperature of 30~60"C and a relative humidity of 95%, its appearance, structure and insulation resistance shall comply with the provisions of Article 3.5, Article 3.6 and Article 3.17.1, and can work normally . 3.16.9 Mold
After the intercom equipment has been subjected to the fungus test in 4.7.10.9, its appearance, structure and main performance shall comply with the provisions of 3.5, 3.6 and the product specifications.
3.16.10 Salt spray
After the intercom equipment has been subjected to the salt spray test specified in Table 4, its appearance and structure shall comply with the provisions of 3.5 and 3.6 respectively and shall be able to work normally.
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Salt solution
Weight ratio
3.16.11 Rain
SJ 20738-1999
Salt spray settling rate
ml/80cm2.h
(average value of 16 or above)
Test temperaturebZxz.net
Salt spray treatment method
Spray for 24h, dry for 24h under normal test atmospheric conditions ht
consists of one cycle,
continuous spraying
test time
When the intercom equipment is subjected to the rain test of Article 4.7.10.11, its appearance, structure and insulation resistance shall comply with the provisions of Articles 3.5, 3.6 and 13.17.1, and can operate normally. 3.17 Safety
3.17.1 Insulation resistance
The insulation resistance between the DC power input terminal of the equipment in the cabin and the casing (the power switch is in the on position), and between the external live terminals with insulation requirements and the casing shall comply with the provisions of Item 1 in Table 5. The insulation resistance between the AC power input terminal of the extension in the cabin, the regulated power supply and the power input terminal of the equipment outside the cabin and the casing (the power switch is in the on position), and between the external live terminals with insulation requirements and the casing shall comply with the provisions of Item 1 in Table 5. The insulation resistance between the shells shall comply with the provisions of item 2 in Table 5.
3.17.2 Dielectric strength
Normal conditions
≥100
Measure immediately after the damp heat test
Between the power input terminal of the intercom equipment and the housing (the power switch is in the on position) When the test voltage is selected according to Table 6 for the dielectric strength test between the external live terminals with insulation requirements and the housing, no arcing or breakdown should occur. Table 6
Working voltage
≥60～120
≥120～~240
3.18 Electromagnetic compatibility
Test voltage
The electromagnetic compatibility of the intercom equipment shall comply with the relevant provisions of GJB151A, and the specific requirements shall be specified by the product specifications. 3.19 Reliability
The reliability of intercom equipment is expressed by the mean time between failures (MTBF), and its lower limit value6 should not be less than 3000 h. 3.20 Maintainability
The maintainability design of intercom equipment should comply with the provisions of GJB368.2. Its mean time to repair (MTTR) should not exceed 30min.
4 Quality Assurance Provisions
4.1 Inspection Responsibility
SJ 20738-1999
Unless otherwise specified in the contract or order, the contractor shall be responsible for completing all inspections specified in this specification. If necessary: the ordering party or the superior appraisal agency has the right to inspect any inspection item described in the specification. 4.1.1 Qualified Responsibilities
All products must meet all requirements of Chapter 3 and Chapter 5 of this specification. The inspections specified in this specification shall become an integral part of the contractor's entire inspection system or quality management system. The contract shall include inspection requirements not specified in this specification. The contractor shall also ensure that the products submitted for acceptance meet the contract requirements. Quality consistency samples are not allowed to submit products that are known to be defective, nor are they allowed to require the ordering party 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
4.3.1 Climate conditions
Unless otherwise specified, all tests specified in this specification shall be carried out under the following standard atmospheric conditions: Temperature: 15~35°C;
Relative humidity: 20%80%
Atmospheric pressure: atmospheric pressure of the test site.
4.3.2 Power supply
AC power supply:
Voltage: 220±4.4V
Frequency: 50+1Hz;
Waveform distortion: ≤5%.
DC power supply:
Voltage: 24V±2%:
Ripple voltage: ≤10mV,
4.3.3 Preferred frequency for measurement
20, 31.5, 40, 63, 80, 125, 250, 500, 1000, 2000, 4000, 8000, 12500Hz4.4 Appraisal and inspection
Appraisal and inspection are generally carried out when the equipment is designed and finalized for production. However, when there are major changes in the main design, process, components and materials of the equipment, which affect the important performance of the equipment and make the original appraisal conclusion no longer valid, appraisal and inspection should also be carried out.
Appraisal and inspection should be carried out in a laboratory approved by the ordering party or the superior appraisal agency. 4.4.1 Number of samples
The number of samples for appraisal and inspection should generally not be less than two. For samples with more than two units, they can be tested in groups. 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. After the system equipment has been inspected and qualified, the system equipment is actually used to check the intercom and various functions specified in the product specifications. Table 7
Appearance quality
Structure and size
Protection function
System intercom
Performance parameters
Main performance parameters
Continuous working time
Durability
Low temperature storage
Low temperature working
High temperature storage
High temperature working
18 Wet heat
Safety
Electromagnetic compatibility
Reliability
Maintainability
Storage and packaging
Quality consistency test
Note: ①The symbol “·” in the table indicates mandatory items: “” indicates optional items: “②Group A inspection does not include the insulation resistance requirements after the wet heat test. Qualification criteria
Chapter number
” indicates no items.
Test method
Chapter number
4.7.10.10
4.7.10.11
When all inspection items meet the requirements of Chapter 3 and Chapter 5, and no faults specified in the product specifications occur-8-
then it is judged to be qualified for the appraisal inspection
SJ 20738-1999
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 continuing to inspect, the appraisal inspection is judged to be unqualified. 4.4.4 Maintenance of qualification
In order to maintain the qualification of the appraisal inspection, the contractor shall provide products, test data or 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
Quality consistency inspection is divided into A, B, C and D group inspection. 4.5.2 Formation of inspection batch
The formation of inspection batch shall comply with the provisions of Article 3.6 of GJB179A. 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 Sampling plan
Group A sampling inspection shall be carried out in accordance with the relevant provisions of GJB179A, using a normal inspection sampling plan of general inspection level II. The acceptable qualified quality level (AQL) shall be selected from Table 8. The specific requirements shall be specified by the product specifications. Defect classification shall be in accordance with SJ/T10406 and product specifications. Table 8
Defect classification
Major defects
Minor defects
4.5.3.3 Qualification criteria
Acceptable quality level (AQL)
According to the inspection results of the samples, if the number of defects found is 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. Fatal defects are not 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 separate the batch of products, find out the causes of the defects, and take corrective measures before resubmitting them for inspection. The resubmitted batch should be separated from the new batch, marked with "resubmitted batch", and stricter inspection should be adopted.
If the re-inspection is qualified, the batch is judged to have passed the Group A inspection: If the re-inspection is still unqualified, the Group A inspection is judged to have failed.
4.5.3.5 Handling of Group A Inspection Samples
If defective products are found in the batches that have passed the Group A inspection, the contractor shall be responsible for repairing them and the batches can be delivered in accordance with the contract or order after they meet the requirements of the product specifications. : 4.5. 4 Group B Inspection
Group B inspection shall be carried out on the products in the batches that have passed the Group A inspection. - 9-
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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 Plan
SJ 20738--1999
Group B inspection shall be carried out in accordance with the relevant provisions of GJB179A, adopting a sub-sampling plan of special inspection level S-2, and the acceptable quality level (AQI) shall be in accordance with the provisions of Table 9. Defect classification shall be in accordance with SJ/T10406 and product specifications. Table 9
Defect classification
Serious defects
Minor defects
4.5.4.3 Qualification criteria
Acceptable quality level (AQL)
According to the inspection results, if the number of defects found is not greater than the qualified judgment number, the B group inspection is judged to be qualified, otherwise, the B group inspection is judged to be unqualified.
4.5.4.4 Re-inspection
For batches that fail the B group inspection, the contractor shall analyze the batch of products, find out the reasons for the defects, and take corrective measures before resubmitting them 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 be qualified for the B group inspection; if the re-inspection is still unqualified, the batch is judged to be unqualified for the B group inspection.
4.5.4.5 Handling of Group B Inspection Samples
If defective products are found in the batches that have passed the Group B inspection, the contractor shall 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. 4.5.5 Group C Inspection
Group C inspection shall be carried out on the products of the Group A and Group B inspection batches. 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
Group C inspection shall be carried out in accordance with the relevant provisions of GB179A: a single sampling plan with special inspection level S-1 shall be used, and the acceptable quality level (AQL) shall be selected from Table 10. The specific requirements shall be specified by the product specifications. The defect classification shall be specified by the product specifications.
Defect classification
Serious defects
Minor defects
4.5.5.3 Qualification determination
Acceptable quality level (AQL)
According to the inspection results, if the number of defects found is not greater than the qualified determination number, the batch of C group inspection is determined to be qualified, otherwise, the batch of C group inspection is determined to be unqualified.
Fatal defects are not allowed in C group inspection, otherwise, the C group inspection is determined to be unqualified. 4.5.5.4 Re-inspection
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SJ20738—1999
If the sample fails to pass the C group 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 the cause and taking corrective measures, it can be resubmitted for inspection. When resubmitting for inspection, the number of samples shall be increased, and all tests or inspections shall be carried out according to the opinions of the qualified appraisal unit, or only the unqualified items shall be tested or inspected.
If the re-inspection is qualified, the batch of Group C is still judged to be qualified; if the re-inspection is still unqualified, the unqualified situation should be reported to the qualified appraisal unit.
4.5.5.5 Sample Handling
Unless otherwise specified, the contractor shall repair all the found or potential damages of the samples after the C group inspection, and then pass the A and B group inspections before delivery according to the contract or order. 4.5.5.6 Inspection Cycle
Unless otherwise specified, each submitted batch shall be subject to a C group inspection, but not less than once a year. When there are major changes in the main design, process, components and raw materials of the equipment that have a major impact on the performance of the equipment, a C group inspection shall also be conducted.
4.5.6 Group D Inspection
Group D inspection shall be conducted on the products of the batches that have passed the A and IB group inspections. 4.5.6.1 Inspection Items
The D group inspection items shall be in accordance with the provisions of Table 7.
4.5.6.2 Sampling Plan
The D group inspection samples shall be randomly selected from the products of the A and B group inspections. The number of samples shall be specified by the product specifications.
4.5.6.3 Failure
If the sample fails to pass the Group D test, the product inspection and delivery shall be stopped. The contractor shall notify the qualification appraisal unit of the failure. After finding out the cause and taking corrective measures, it can be resubmitted for inspection. If the re-inspection is qualified, the batch is still judged to have passed the Group D test; if the re-inspection is still unqualified, the unqualified situation shall be notified to the qualification appraisal unit.
4.5.6.4 Sample handling
Unless otherwise specified, the contractor of the sample that has passed the Group D test shall be responsible for repairing and replacing parts that have consumed all or most of the design service life, and can be delivered according to the contract or order after passing the Group A and Group B tests. 4.5.6.5 Inspection cycle
The Group D inspection cycle shall be determined by negotiation between the ordering party and the contractor, but when there are major changes in the main design, process, components and raw materials of the equipment that have a great impact on the performance of the equipment, the Group D inspection shall also be carried out. 4.6 Packaging inspection
4.6.1 Inspection items
Packaging inspection items shall be in accordance with the provisions of Table 7.
4.6.2 Sample quantity
Sealing and packaging According to the identification test, two samples randomly selected shall be tested: packing and labeling shall be sampled according to the sampling plan of Group A inspection of quality consistency inspection. 4.6.3 The results of sealing and packaging inspection shall comply with the provisions of Article 5.1, and the results of packing and labeling inspection shall comply with the provisions of Articles 5.2 and 15.4 respectively.
4.7 Inspection method
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