Some standard content:
Military Standard FL5805 of the Electronic Industry of the People's Republic of China
General specification for VHF/FMvehicle radio
Published on February 1, 1992
China Electronics Industry Corporation, approved
SJ20028-92
Implementation on May 1, 1992
General Technical Conditions for Military Communication Equipment (GJB367.1GJB367.5) issued by the National Defense Science and Technology Commission in 1987 include the design and manufacturing requirements, environmental test methods, reliability identification test and acceptance test methods, acceptance rules, packaging, transportation and storage requirements for long-range and tactical communication equipment. The General Technical Conditions for Tactical FM Radio (GJB318) issued later, which only applies to tactical communication equipment, stipulates the technical requirements, quality assurance regulations and packaging requirements for all tactical FM radios on the ground, airborne and shipborne.
This specification is a new content in the series of tactical communication technology standards. It specifies in detail the general technical requirements for the design, manufacture, acceptance, packaging, transportation and storage of VHF/FM vehicle radios. This specification refers to GJB318-87 "General Technical Conditions for Tactical FM Radios" and the US military tactical communication standard MIL--STD-188-242 (1985) and the product specifications of VRC-8000 radios. 1 Scope
People's Republic of China Electronic Industry Military Standard General Specification for VHF/FM Vehicle Radio 1.1 Subject Content
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This specification specifies the requirements, quality assurance regulations, delivery preparation and instructions for military VHF/FM vehicle radios (hereinafter referred to as VHF/FM vehicle radios). 1.2 Scope of Application
This specification applies to various types of VHF/FM vehicle radios. When writing the detailed specifications of a specific model of VHF/FM mobile radio, the requirements of this general specification should be followed. 2 Referenced documents
General requirements for electromagnetic emission and sensitivity requirements for military equipment and subsystems. GJB151.4
GJB152
GJB179
GJB237
GJB238
GJB 367.5
3 Requirements
3.1 Detailed specifications
Requirements for electromagnetic emissions and sensitivity of military equipment and subsystems Requirements for equipment and subsystems in ground installations (fixed and mobile, including tracked and wheeled vehicles) (Class A) Counting sampling inspection procedures and tables for measurement of electromagnetic emissions and sensitivity of military equipment and subsystems
Requirements for the interface between digital telephone security machines and ultra-short wave FM radio stations Measurement methods for tactical FM radio stations
General technical conditions for military communication equipment Design and manufacturing requirements General technical conditions for military communication equipment Environmental test methods General technical conditions for military communication equipment
Reliability identification test and acceptance test methods General technical conditions for military communication equipment
Requirements for packaging, transportation and storage
Maintainability specifications for communication equipment
Product individual requirements not specified in this general specification shall comply with the requirements of the detailed specification. 3.2 Design
3.2.1 Radio Features
The operating frequency range of VHF/FM vehicle radio is generally 30～88MHz, or a section is selected within the 30～88MHz frequency band: the channel spacing is 25kHz, and it has two working modes: simplex analog voice and digital voice (or data). The radio is used for communication in military vehicles such as tanks, armored vehicles, self-propelled artillery, engineering vehicles and communication command vehicles. 3.2.2 Radio Composition
In addition to the transceivers and transmitters involved in this specification, the complete set of radio components also includes antennas, antenna matchers, radio mounting brackets, cables and other accessories as well as random documents. If the ordering party needs to add additional units such as RF power amplifiers and audio power amplifiers, it will be specified in the detailed specifications.
3.3 Reliability
3.3.1 Reliability Design
The reliability design of VHF/FM vehicle radio shall comply with the provisions of Article 1.3.1 of GJB367.1. 3.3.2 Reliability Index
The reliability index of VHF/FM vehicle radio, mean time between failures (MTBF) shall be specified in the detailed specification. 3.4 Safety
The safety design of the radio shall comply with the requirements of Article 1.8 of GJB367.1. Specific requirements for safety shall be specified in the detailed specification.
3.5 Maintainability and Interchangeability
a. The maintainability design shall comply with the requirements of Article 1.6 of GJB367.1. The mean time to repair (MTTR) and self-test function of the radio shall be specified in the detailed specification.
b. Interchangeability shall comply with the requirements of Article 1.7 of GJB367.1. Functional components (assemblies) of the same type should be interchangeable, and components (assemblies) that need to be readjusted after interchange must be described in the detailed specifications. 3.6 Standardization
The standardization of radio stations shall comply with the requirements of Article 1.1 of GJB367.1. 3.7 Structure and process
The structure and process of radio stations shall comply with the requirements of Article 1.5 and Chapter 2 of GJB367.1 respectively, to ensure that the radio stations can withstand the vibration and bounce during vehicle use, and are easy to repair and install. Detailed requirements for structure and process are described in the detailed specifications. 3.8 Performance characteristics
3.8.1 General electrical properties
3.8.1.1 Frequency range
The frequency range of radio stations is 30~88MHz. If a certain frequency band is selected within this frequency range, it should be specified in the detailed specifications.
3.8.1.2 Channel spacing
The channel spacing of radio stations is 25kHz.
3.8.1.3 Working mode
The radio station shall have two working modes: simplex FM analog voice and digital voice (or data) with a digital rate of 16kbit/s. If there are other working modes, they should be specified in the detailed specifications. 3.8.1.4 Frequency error
Under the specified working environment conditions, the deviation of the working frequency of the receiver and transmitter of the radio station shall not exceed ±500Hz. 3.8.1.5 Power supply voltage
The rated power supply voltage used by the radio station is DC 26V, the negative pole of the power supply is grounded, and the allowable voltage variation range is 22~30V. 3.8.1.6 RF terminal impedance
The RF input impedance of the radio station receiver and the RF output impedance of the transmitter are both 502 (unbalanced to ground). 2
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3.8.1.7 Audio terminal impedance
The audio input impedance of the radio is 150Ω (at 1000Hz reference frequency), and the output impedance is 6000 (at 1000Hz reference frequency).
3.8.1.8 Continuous working time
Within the specified temperature and voltage range, after the radio works continuously for 12 hours with a ratio of 9 minutes receiving and 3 minutes transmitting, the indicators in Table 1 shall meet the requirements of this specification. Table 1
Sensitivity
Noise suppression sensitivity
Carrier power
Frequency error
Modulation sensitivity
3.8.1.9 Receiving and transmitting delay time
Technical requirements
Testing method
The delay time for the radio station to switch from the receiving state to the transmitting state (the time from the action of the PTT switch to the time when the carrier power of the transmitter reaches 90% of the stable value) should not exceed 60ms; the delay time from the transmitting state to the receiving state (the time from the action of the PTT switch to the time when the noise voltage on the receiver headphone load rises to 50% of the stable value) should not exceed 70ms.
3.8.2 Receiver electrical performance
3.8.2.1 Sensitivity
Within the frequency range specified by the radio station, the sensitivity of the receiver under normal test conditions is: Analog voice mode: When the receiver audio output is rated power, in order to obtain an audio output signal-to-noise ratio of 12dB, the receiver RF input signal power should not be greater than -113dBm (i.e., terminal voltage 0.5μV). b. In digital voice and data mode, when the bit error rate measured at the digital FM baseband output of the receiver is 5×10-, the receiver input RF power should not be greater than -113dBm. 3.8.2.2 Sensitivity at extreme operating temperatures At the specified extreme operating temperature of the radio station, the sensitivity is allowed to be 2dB lower than the sensitivity specified in Article 3.8.2.1. 3.8.2.3 Noise Sensitivity
a. Under normal test conditions, the noise sensitivity shall not exceed -113dBm. b. At the extreme operating temperature, the noise sensitivity is allowed to be 2dB lower than the noise sensitivity under normal test conditions. 3.8.2.4 Noise Hysteresis
Noise hysteresis shall not be less than 3dB.
3.8.2.5 Noise Output Attenuation
Noise Output Attenuation shall not be less than 40dB.
3.8.2.6 Intermediate Frequency Selectivity
The receiver intermediate frequency 6dB bandwidth shall not be less than 15kHz, the 40dB bandwidth shall not be less than 40kHz;
The 60dB bandwidth shall not be less than 50kHz.
3.8.2.7 Dual signal selectivity
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Analog mode: When the receiver output signal-to-noise ratio is 12dB, the receiver dual signal selectivity shall not be lower than the decibel value specified in Table 2.
b. Digital mode: When the receiver output bit error rate is 5×10-\, the receiver dual signal selectivity shall not be lower than the decibel value specified in Table 2.
Pre-rate deviation
Dual signal selectivity
Above 1000
Detailed specification provisions
Detailed specification provisions
3.8.2.8 Maximum audio output signal-to-noise ratio
When the RF input is 100μV, the maximum audio output signal-to-noise ratio at the receiver output shall not be less than 40dB. 3.8.2.9 Spurious response immunity
Spurious response immunity beyond one channel deviating from the operating frequency shall not be less than 70dB. 3.8.2.10 Intermodulation immunity
The intermodulation response generated by two interference signals with equal amplitudes deviating from the operating frequency by ±200kHz and ±400kHz shall not be less than 75dB.
3.8.2.11 Image frequency suppression
Image frequency suppression shall not be less than 80dB.
3.8.2.12 Intermediate frequency suppression
Intermediate frequency suppression shall not be less than 100dB.
3.8.2.13 Adjacent channel suppression
Adjacent channel suppression shall not be less than 60dB.
3.8.2.14 Conducted spurious emission (local oscillator radiation) When the spurious frequency is below 120MHz, the conducted spurious emission at the antenna terminal should not be greater than 50μV; when the spurious frequency is below 1.2GHz, the conducted spurious emission at the antenna terminal should not be greater than 250μV. 3.8.2.15 Limiting characteristics
When the RF signal input to the receiver changes from 0.7μV to 59mV, the audio output change in the range of 300 to 3000Hz should not be greater than 2dB.
3.8.2.16 Total harmonic distortion
When the audio output of the receiver is rated, the total harmonic distortion should not be greater than 7%. 3.8.2.17 Audio output
The audio output of the receiver on a 600Q headphone load should be continuously variable within the range of -10dBm to +20dBm (245mV to 7.75V).
3.8.2.18 Audio response
When the receiver has no de-emphasis circuit, the audio response within 300~3000Hz should not exceed ±2dB relative to the 1000Hz output. wwW.bzxz.Net
3.8.2.19 Baseband output response
When the radio is in data mode, the baseband output response of the receiver should meet the requirements of GJB237. 3.8.2.20 Baseband output level
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When the radio is in data mode, the baseband output level of the receiver should meet the requirements of GJB237. 3.8.2.21 Residual bit error rate
When the radio is working in data mode, the residual bit error rate of the receiver should not exceed 1×10-5. 3.8.2.22 Self-combined interference
The self-combined interference point of the radio should not exceed 0.5% of its number of channels. 3.8.2.23 De-emphasis
Receiver de-emphasis is specified in the detailed specifications of each type of radio. 3.8.2.24 Delay time
The delay time is:
a. Receiver start-up time, the time interval from the addition of a step RF signal (level of -107dBm) to the receiver input to the receiver output signal rising to 90% of its stable value shall not exceed 40ms. b. Receiver release time: the time interval from the removal of the RF signal from the receiver input to the receiver output obtaining a muted signal shall not exceed 60ms.
3.8.2.25 Input protection
The receiver input signal level is +38dBm at the operating frequency and maintained for 1 minute without causing the receiver performance to degrade. 3.8.2.26 Receiver power consumption
The receiver power consumption is specified in the detailed specifications. 3.8.3 Electrical performance of transmitter
3.8.3.1 Carrier power
a. Power classification, the carrier power rating of the transmitter can generally be divided into three grades: 0.2W, 5W, and 50W. If the user has special requirements, it can be specified separately in the detailed specifications of each type of radio station. b. Carrier power variation range: When the power supply voltage is at the rated value, the carrier power in the entire frequency band shall not vary by more than ±1.2dB relative to the rated value; when the power supply voltage is at the highest or lowest, the carrier power shall not vary by more than ±2dB relative to the rated value. 3.8.3.2 Transmitter protection
The transmitter should withstand frequency changes at full power output and open or short circuit at the output end for 3 minutes without causing permanent degradation of performance.
3.8.3.3 Spurious emission components
Harmonic emission components: The second and third harmonic emission components are at least [40+10IgPJdB lower than the fundamental power (where a.
P is the fundamental power in watts).
b. Non-harmonic emission components: The maximum power of all harmonic and non-harmonic spurious emission components except the second and third harmonics is at least 70dB lower than the fundamental power.
3.8.3.4 Carrier noise level
The carrier noise level of the transmitter is specified in the detailed specification. 3.8.3.5 Maximum signal-to-noise ratio
Within the audio bandwidth of 300~3000Hz, the signal-to-noise ratio of the transmitter should not be less than 40dB. 3.8.3.6 Pre-modulation filtering and shaping characteristics
Specified in the detailed specification.
3.8.3.7 Modulation sensitivity
The audio input signal (with 1000Hz as the reference frequency) required for the transmitter to produce the rated frequency deviation should not be greater than 15mV. 5
3.8.3.8 Baseband input level
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The baseband input level when the radio works in data mode should comply with the provisions of GJB237. 3.8.3.9 Modulation characteristics
a. Analog modulation characteristics: The modulation characteristics of the transmitter without emphasis circuit should not change more than ±3dB relative to 1000Hz in the frequency range of 300~3000Hz. The modulation characteristics of the transmitter with emphasis circuit should be specified in the detailed specifications. b. Baseband modulation characteristics: The baseband modulation characteristics of digital voice should comply with the provisions of GJB237. 3.8.3.10 Frequency Deviation
a. Analogue Frequency Deviation: When the radio operates in analogue mode, the transmitter frequency deviation is 5.6±1kHz. b. Digital Frequency Deviation: When the radio operates in digital mode, the transmitter frequency deviation is 5.6±0.8kHz. 3.8.3.11 Pilot Frequency Deviation
The pilot frequency deviation modulated by 150±2Hz single tone is 3±0.5kHz. 3.8.3.12 Modulation Limit
When the telephone input level is increased by 20dB on the basis of obtaining the rated frequency deviation of 5.6kHz, the increase in frequency deviation does not exceed 2kHz
3.8.3.13 Sidetone
The sidetone level in the earphone of the radio in the transmitting state shall be specified by the detailed specification. 3.8.3.14 Pre-emphasis
The modulation pre-emphasis of the transmitter shall be specified by the detailed specification. 3.8.3.15 Total harmonic distortion
The total harmonic distortion of the transmitter audio frequency shall not exceed 7%. 3.8.3.16 Delay time
The start-up time of the transmitter (the time required for a.
process from the input excitation of the transmitter to the output power reaching 90% of the stable value) shall not exceed 25ms. b. The release time of the transmitter (the time required for a.
process from the disconnection of the excitation to the disappearance of the output power) shall not exceed 10ms.
3.8.2.17 Residual bit error rate
When the radio station is in digital working mode, the residual bit error rate of the transmitter shall not exceed 1×10~5. 3.8.3.18 Transmitter power consumption
The power consumption of the transmitter is specified in the detailed specifications. 3.9 Working Capability Check
Check the working capability of the radio station according to the following items: a. All switches and control knobs are flexible and function normally; b. All displays and indicators function normally; c. All sockets and plugs can be smoothly connected with external equipment.
d After the radio is matched with the standard antenna (including the matching device), the voltage standing wave ratio in the power feeder is measured in the full frequency band, and its value shall comply with the value specified in the detailed specifications;
e. The radio works normally after being matched with the digital security machine or data terminal;. The radio to be checked communicates normally with the standard radio. 3.10 Electromagnetic compatibility
3.10.1 The electromagnetic emission on the DC power supply line, control line and interconnection line between equipment shall comply with the requirements of 6
3.2.2.1 of CE03 in GJB151.4.
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3.10.2 Antenna feeder, transmitter harmonic emission and non-harmonic emission a. Second and third harmonic suppression shall comply with the requirements of 3.8.3.3 a; b. Non-harmonic emission shall comply with the requirements of 3.8.3.3 b. 3.10.3 The power line withstands peak voltage
according to the provisions of CS06 in GJB151.4:
The power line withstands peak voltage value of 100V, and the duration is not more than 10μs. 3.10.4 The radiation of the power line, housing, control line and antenna feeder shall comply with the provisions of RE02 in GJB151.4:
The broadband electric field emission shall not exceed the corresponding limit value in Figure 13 of RE02. 3.10.5 Radiated sensitivity
According to the provisions of RS03 in GJB151.4, when the radio station is added with a radiated electric field of 5V/m (frequency range is 30~88MHz), no faults should occur and the performance should meet the requirements. 3.10.6 The conducted sensitivity of the power line and ground line shall comply with the provisions of CS02 in GJB151.4.
When the signal source with an internal resistance of 500 outputs 1W, and direct current is applied to the power input terminal (according to the method in Article 14.3 of GJB152), the radio should not have any faults or performance degradation. 3.11 Environmental requirements
3.11.1 Temperature
Working temperature, -40～+65℃;
Storage temperature, 50～+70℃;
Test the radio according to the test method in Article 4.7.8.1, and the radio performance should meet the requirements of Table 3. Table 3
Frequency error
Sensitivity
Quiet sensitivity
Carrier power
3.11.2 Damp heat
Technical requirements
Testing method
After the damp heat test, the moving parts of the radio should not be stuck, the gold chips parts and labels should not show signs of corrosion damage, and the coating should not peel off or bubble. And the test shall meet the requirements according to the items specified in Table 3. 3.11.3 Salt spray
After the radio station is subjected to the salt spray test, there shall be no obvious white spots, bubbles, pits, paint peeling, coating peeling, etc. on the surface. 3.11.4 Immersion
Put the radio station in 1m deep water and immerse it for 120±5min. According to the calculation that the water accumulation shall not exceed 4cm per 28000cm of the casing volume, it shall meet the requirements.
The immersion test is only applicable to radio stations used both on the back and in vehicles. Vehicle-mounted radio stations are not subject to this test. -7-
3.11.5 Rain
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The radio station shall be subjected to a 30min rain test on each side, left, right, top, front and back. After the test, open the casing and check that there shall be no water accumulation and water drops inside.
3.11.6 Dust
After the dust test, the radio shall meet the requirements by measuring the performance in Table 4. Table 4
Rated rate error
Sensitivity
Carrier power
Working capacity inspection
3.11.7 Vibration
Technical requirements
Testing method
After the vibration test, the fixed parts shall not be loose or shifted, and the movable parts shall not be stuck. The measurement shall meet the requirements according to the items specified in Table 4.
3.11.8 Impact
After the impact test, the radio shall meet the requirements by measuring the items specified in Table 4. 3.11.9 Low pressure
The radio shall meet the requirements by measuring the low pressure test. When the pressure in the test box is reduced to 57kPa, the performance shall meet the requirements in Table 3. 3.11.10 Each bacteria
Specified by detailed specifications.
3.11.11 Temperature shock
Specified by detailed specifications.
3.12 Nuclear reinforcement
Specified by detailed specifications.
3.13 Detailed requirements for components
3.13.1 Printed circuit boards
The materials used for printed circuit boards shall comply with national standards. 3.13.1.1 Protective coating
Printed circuit boards shall use coatings that comply with national standards or industry standards. Before coating, the circuit board must be cleaned of flux and other dirt. The cleaning agent must not be harmful to any part of the circuit board, and the protective coating must be uniform on all parts. 3.13.1.2 Welding
The solder joints on the printed circuit board should be smooth and round, meeting the process requirements. 3.13.1.3 Process
When deformation may occur during the soldering process of the printed circuit board, preheating treatment technology should be used. The solder joints should not have scars, blistering, cold solder joints, slag particles and other harmful defects. 3.13.1.4 Cleaning
Oxides and excess flux should be removed from soldered printed board assemblies with non-corrosive flux or other suitable methods. 3.13.2 Fixing of components
Components should be fixed under specific conditions of use, such as large resistors, large inductors, magnetic rings, large-capacity capacitors, etc.-8-
3.13.3 Soldering
3.13.3.1 Solder
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The solder used in the radio station should be in accordance with the requirements of the drawings. 3.13.3.2 Flux
Acid or acid salt flux shall not be used in the preparation for soldering. However, the initial tinning of electrical contacts and the tinning or soldering of mechanical connections that are not used to connect the circuit are allowed as exceptions. Acids or acid salts must never be used where they may come into contact with insulating materials. Where acids or acid salts are permitted, they must be completely neutralized and immediately washed away after use. 3.13.4 Cleaning
Assembled or welded parts or components must be thoroughly cleaned. 3.13.5 Wires and wire ties
3.13.5.1 Some insulated wires should be made into wire ties. Wire ties should be manufactured strictly in accordance with design drawings and process documents. 3.13.5.2 Wires and cables should have appropriate margins to avoid stress concentration and breakage due to excessive tension, and not too much margin to affect electrical performance or collide with other components. 3.13.5.3 Wires and cables should be fixed in appropriate positions to avoid vibration and pulling off solder joints. 3.14 Dimensions
The dimensions of the radio should be suitable for installation on vehicles such as tanks, armored vehicles, and self-propelled artillery. For radios that can be used both on the back and on the vehicle, the dimensions of the mounting frame should also meet the requirements for vehicle installation. The specific dimensions are specified in the detailed specifications. 3.15 Weight
The weight of the radio shall be reduced as much as possible and specified in the detailed specifications according to the user's requirements. 3.16 Color
The color of the radio shall comply with the provisions of Article 1.20 of GJB367.1. 3.17 Marking and Code
The radio shall have a marking and code. The model, manufacturing date and production batch number of the product shall be indicated on the label. 3.18 Appearance Quality
The appearance of the complete set of radio equipment shall be neat, color coordinated, and free of scratches, burrs, rust and paint accumulation on the surface. All switches, knobs and indicators shall have coordinated colors and smooth surfaces. 4 Quality Assurance Provisions
4.1 Inspection Responsibility
Unless otherwise specified in the contract or order, the contractor shall be responsible for the technical performance of all inspection items specified in this specification. The contractor may use its own equipment, instruments and devices (which meet the requirements of this specification) to inspect the product. The ordering party or the superior appraisal organization has the right to inspect any of the inspection items described in the specification. 4.1.1 Responsibility for Conformity
All products must meet all the requirements of Chapter 3 and Chapter 5 of this specification. The inspections specified in this specification become an integral part of the contractor's entire inspection system or quality program. If the contract includes inspection requirements not specified in this specification, the contractor shall ensure that the products submitted for acceptance meet the contract requirements. 4.2 Inspection Classification
The inspections specified in this specification are divided into: appraisal inspection and quality consistency inspection. 8. Appraisal Inspection
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Appraisal inspection includes design finalization, production finalization and first batch inspection (first batch inspection refers to the first batch of production after major improvements in design, process, materials, etc. or the first batch of products resumed or transferred to another factory after two years of suspension). The purpose of appraisal inspection is to conduct a series of inspections and tests on the product in order to make a comprehensive evaluation of the product quality and provide a basis for approving whether the product can be mass-produced. b. Quality consistency inspection
Through the inspection items specified in the specification, determine whether the submitted batch of products meets the quality requirements, so as to determine whether the batch of products should be accepted or rejected.
4.3 Inspection conditions
Unless otherwise specified, all inspection conditions of this specification shall comply with the provisions of Article 4.7.2. 4.4 Identification inspection
4.4.1 Identification inspection items
Identification inspection items shall be carried out in accordance with the provisions of Table 5. If the test time needs to be shortened, environmental tests may be carried out in groups after the inspection items under normal conditions are completed, provided that the number of products is sufficient. 4.4.2 Sampling
The samples for identification inspection shall be randomly selected by the quality inspection department from 2 to 10 units (specific details shall be specified in the detailed specifications) from the formal trial-produced prototypes, and shall be inspected in accordance with the identification inspection items and sequence specified in Table 5. 4.4.3 Reliability test
The reliability test of identification inspection shall be carried out in accordance with Article 4.7.4.1. 4.4.4 Qualification judgment of identification inspection
The identification inspection shall be judged as qualified when the following two conditions are met: a. The samples shall be inspected in accordance with the items and sequence specified in Table 5, and shall be judged as qualified according to the requirements of Chapter 3: b. The reliability test is qualified.
4.5 Quality consistency inspection
Quality consistency inspection is divided into Group A, Group B, Group C and Group D inspection. , 4.5.1 Group A inspection
4.5.1.1 Group A inspection items
The items of Group A inspection shall be specified in Table 5.
4.5.1.2 Group A inspection plan
Group A inspection can adopt either full inspection or sampling inspection plan. a. Full inspection
The quality inspection department inspects each product of the submitted batch. The quality of the inspection batch is expressed by the product defective rate; the rate of major defective products is 4%;
The rate of minor defective products is 10%;
b. Sampling inspection
The quality inspection department randomly selects samples from the submitted batch of products for inspection. The sampling plan adopts the normal inspection sampling plan in GJB179, general inspection level 1. The qualified quality level is stipulated as follows: AQL for seriously unqualified products is 1.0, 1.5, 2.5; AQL for slightly unqualified products is 2.5, 4.0, 6.5. The specific requirements are stipulated in the detailed specifications. Defect classification is shown in Appendix A (Supplement). 4.5.1.3 Group A inspection judgment
a, full inspection
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