GB/T 14859-1993 General technical requirements for black and white television broadcast receivers
Some standard content:
UDC 621.397.62
National Standard of the People's Republic of China
GB/T 14859—93
General specification for monochrometelevision broadcasting receivers1993-12-30 Issued
State Administration of Technical Supervision
1994-09-01 Implementation
National Standard of the People's Republic of China
General specification for monochrometelevision broadcasting receivers1 Subject content and scope of application
GB/T14859—93
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, etc. of black-and-white television broadcasting receivers (hereinafter referred to as black-and-white television sets).
This standard applies to black-and-white television sets with a screen size of not less than 31 cm that conforms to the radio and television system of my country. It is the basis for manufacturers to formulate product standards and is also the rule to be followed when designing, manufacturing and inspecting products. Black and white TVs with a screen size of less than 31cm can refer to it. 2 Reference standards
GB2828
GB2829
GB3174
GB4877
Count sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches)Count sampling procedures and sampling tables for periodic inspection (applicable to inspection of production process stability)Color television broadcasting
TV intermediate frequency
GB8898
GB9372
GB9379
GB9380
GB9381
GB9383
GB9384
Graphical symbols for electrical equipment
Safety requirements for household and similar general purpose electronic and related equipment powered by mains supplyMethods of measurement for television broadcast receivers
Subjective test evaluation method for television broadcast receiversColor television broadcast receiver package
Test methods for transport packages of television broadcast receivers |Methods for measuring conducted immunity characteristics of broadcast receivers and related equipment |Environmental test requirements and test methods for broadcast radios, broadcast television receivers, tape recorders, audio power amplifiers (amplifiers)
Requirements for interconnection and matching of color television broadcast receivers with other equipment GB12281
GB13837
Allowable values and measurement methods for interference characteristics of sound and television broadcast receivers and related equipment GB/T15639 Subjective evaluation of program sources for television broadcast receivers SJ2303TX concentric plug socket
SJ2596
Reliability identification test and acceptance test for black and white television receivers SJ2778
3 Terminology of broadcast receivers
3 General requirements
3.1 Television standard
Should comply with the provisions of GB3174.
Approved by the State Administration of Technical Supervision on December 30, 1993 and implemented on September 1, 1994
3.2 Receiving channels
VHF: Channels 1 to 12.
GB/T14859-93
UHF: Channel 1368 (temporarily Channel 1357). For the specific channel frequency division table, see Appendix C (reference). 3.3 Intermediate frequency
Should comply with the provisions of GB4877.
3.4 Conditions of use
The conditions of use are specified by the product standards.
3.5 Normal test conditions
Temperature: 15~35℃.
Relative humidity: 45%~75%.
Atmospheric pressure: 86~106kPa.
Power supply voltage: AC 220±6.6V.
Power frequency: 50±1Hz.
Note: The power supply voltage of DC-powered black-and-white TVs is specified by the product standard. 3.6 Graphic symbols
Graphic symbols shall comply with the relevant provisions in GB5465.2. 3.7 Interconnection and matching requirements
When black-and-white TVs are connected with headphones, radios, recorders, video recorders, microcomputers and cable distribution systems, the interconnection and matching requirements for audio, video and high frequency shall comply with the relevant provisions in GB12281. The video connector can also meet the requirements of SJ2303. The matching requirements for black-and-white TVs and external DC power supplies are specified by the product standard, but the same connector as that for audio, video and high frequency matching shall not be used. 4 Technical requirements and test methods
4.1 Appearance, structural requirements and inspection methods
The appearance of black-and-white TVs should be neat, and there should be no defects such as dents, scratches, cracks, deformations, burrs, mildew spots, etc. on the surface, and the surface coating should not bubble, crack or fall off.
Metal parts should not have rust or other mechanical damage, and the injection material should not overflow. The operation of switches, buttons and knobs should be flexible and reliable, and the parts should be tightened without looseness. The installation of the picture tube should match the chassis without obvious gaps, and the whole machine should have sufficient mechanical stability. The text and graphic symbols that describe the function should be correct, clear, upright and firm, and the indicators should be correct. Check by visual inspection and touch.
4.2 Electrical, optical and acoustic performance requirements and measurement methods The electrical, optical and acoustic performance parameters of black and white TVs are required according to Table 1, and the measurement methods are carried out according to the provisions of GB9372. 2
Project name
Image channel noise limit sensitivity
Machine adjustment:
When 752 input
Not inferior to
Not inferior to
When 300Q input
Not inferior to
Not inferior to
Electrical adjustment:
When 752 input
Not inferior to
Not inferior to
When 300Q input
VHF is not inferior to
UHF is not inferior to
Automatic gain control static characteristics
G B/T14859—93
1 Parameter requirements and measurement methods
When the output level changes by ±1.5dB, the input level change shall not be less than
Automatic gain control dynamic characteristics 1)
Not less than
Automatic frequency control characteristics 2
Introduction range shall not be inferior to
(based on high frequency)
Residual error shall not be inferior to
(based on mid-range frequency)
Traveling wave coefficient at antenna input end
Not less than
Selectivity
—1.5MHz and below
not less than
+8MHz and above
not less than
Intermediate frequency suppression capability3
not less than
False image suppression capability3)
VHF: not less than
UHF not less than
Interference modulation suppression capability
When 752 is input, not less than
When 300Q is input, not less than
Parameter requirements
Measurement method
GB9372
GB9372
GB9372
GB937 2
Number of measurement channels
Channel 1
Item name
Vertical frequency square wave response K50
Not greater than
Nonlinearity of luminance signal during lines
Not greater than
Image reappearance rate 5
Not less than
Horizontal direction
Vertical directionNot less than
Scanning nonlinear distortion
Horizontal directionNot greater than
Vertical direction
Image geometric distortion
Not greater than
Not greater than
Image central clarity
Horizontal directionNot less than In the vertical direction, the synchronization range of scanning is not less than
Line: the introduction range is not inferior to
the holding range is not inferior to
(based on 15625Hz)
Field synchronization range (including 50Hz)
not less than
Power supply to maintain image stability
Voltage change range
Low power consumption class
Not inferior to
Wide range class is not inferior to
Power consumption power 6)
When the screen size of the picture tube is:
31~35cm,
Low power consumption class is not too large For
wide range category, not more than
40~44cm,
low power category, not more than
wide range category, not more than
full screen maximum brightness
when the screen size of the picture tube is:
31~35cm, not less than
40~44cm, not less than
large area contrast 7)
when the screen size of the picture tube is:
31~35cm, not less than
40~44cm, not less than
9—93
GB/T14859
Continued Table 1
Parameter requirements
-15~+10
—25~+10
Measurement method
GB9372
GB9372
9376
9372
9372
GB9372
9372
Number of measurement channels
Project name
Noise-limited sensitivity of audio channel
GB/T14859—93
Continued Table 1
Not inferior to the nominal noise-limited sensitivity of the image channel Multiples
Maximum useful electrical output power of the sound channel
When the screen size of the picture tube is:
When 31~35cm, not less than
When 40~44cm, not less than
Acoustic frequency response of the sound channel 10)
When the sound pressure unevenness is 16dB:
For horizontal structure:
When 31~35cm, not less than
When 40~44cm, not less than
For vertical structure:
When 31~35cm, not less than
When 40~44cm, not less than
Sound channel Average sound pressure of the channel 10)
For horizontal structure:
31~35cm, not less than
40~44cm, not less than
For vertical structure:
31~35cm, not less than
40~44cm, not less than
Sound pressure of the accompanying sound channel Harmonic distortion coefficient 10) not greater than
Image signal, scanning and power supply circuit noise generated in the accompanying sound channel 11)
not greater than
Amplitude modulation suppression capability of the accompanying sound channel
not less than
Parameter requirements
200~56 00
180~6300
250~5000
200~5600
Measurement method
GB9372
GB9372
GB9372
GB9372
GB9372
GB9372
GB9372
Number of measurement channels
Note: 1) Only the sinusoidal periodic change of input signal level is tested, and the peak-to-peak value of the voltage amplitude difference at the output of the video amplifier is checked (the voltage when the change is not greater than 10%).
2) TV sets without AFT function are not tested. 3) Only the parameters when the input level is the nominal value of the noise limit sensitivity of the image channel are tested. 4) Only the parameters when the input level is the standard input level are tested. 5) Parameter indicators for CRT screen aspect ratio of 5:4: not less than 90% in vertical direction and not less than 85% in horizontal direction. 6) For TV power consumption of special tubes and 110° deflection angle CRTs, parameter requirements are specified in the enterprise standards. 7) Only parameters when the black band brightness is 1Cd/m2 are assessed. 8) Only parameters when the signal-to-noise ratio of the audio channel is 30dB are assessed. 9) Only parameters when the voltage harmonic distortion coefficient is 7% are assessed. 10) Due to structural design requirements, when the speaker is on the side or on the top, the parameter requirements are specified in the enterprise standards. 11) Only parameters when the input level is: 100uV for 75Q input and 200μV for 300Q input are assessed. 5
4.3 Electromagnetic compatibility requirements and measurement methods
4.3.1 Interference characteristics
GB/T14859-93
The limit value and measurement method of interference characteristics shall comply with the provisions of GB13837. 4.3.2 Immunity
The requirements for immunity shall be specified by the product standards, and the measurement method shall comply with the provisions of GB9383. 4.4 Safety requirements and test methods
The safety of black-and-white TVs shall comply with the relevant provisions of GB8898. The items, requirements and test methods are shown in Table 2. Table 2 Safety test items, requirements and methods
4.5 Subjective test evaluation
Ionizing radiation
Safety items
Temperature rise under normal working conditions
Temperature rise under high temperature environment
Electric shock hazard under normal working conditions
Insulation requirements
Fault conditions
Mechanical strength
Components connected to the grid power supply
Components
Connection terminals| |tt||External soft wire
Electrical connection and mechanical fixationbzxZ.net
Mechanical strength of picture tube and mechanical stability against explosion
Fire protection of TV
4.5.1 Evaluation level and requirements
Requirements and test methods (according to GB8898)
14.1~14.8
Evaluation level and requirements According to the provisions of GB9379, when the five-level quality system or damage system is adopted, the requirement is not less than level 3 (medium). When the five-level comparison system is adopted, generally a reference prototype not less than level 3 or level 4 is selected, and the evaluation result is required to be not less than level 3 (medium) of the corresponding five-level quality system or damage system.
4.5.2 Subjective test evaluation method
The subjective test evaluation method of black-and-white TV should be carried out in accordance with the relevant provisions of GB9379. The subjective evaluation program source of black-and-white TV should comply with the provisions of GB/T15639. 4.6 Environmental requirements and test methods
The environmental requirements and test methods for black-and-white TVs shall comply with the provisions of GB9384. 4.7 Reliability requirements and test methods
4.7.1 Requirements
The lower limit of the mean time between failures (MTBF) of black-and-white TVs shall not be less than 5000h. 4.7.2 Test methods
Should be in accordance with the provisions of SJ2596.
5 Inspection rules
GB/T14859-93
Inspection includes identification inspection, delivery inspection and routine inspection. 5.1 Identification inspection
5.1.1 Purpose
The purpose of identification inspection for black-and-white TVs is to verify whether the manufacturer is capable of producing products that meet the requirements of this standard. 5.1.2 Inspection items, requirements and test methods During design finalization and production finalization, or when otherwise required, identification inspection shall be carried out. The inspection items, requirements and methods are shown in Table 3. Table 3 Inspection items Requirements and methods
Electrical, optical and acoustic performance measurement
Electromagnetic compatibility test
Safety test
Subjective evaluation
Environmental test
Reliability test
According to Article 4.2
According to Article 4.3
According to Article 4.4
According to Article 4.5
According to Article 4.6
According to Article 4.7
Requirements and methods
For products with different shapes and added or reduced functions derived from products that have passed production finalization, under the premise of ensuring quality, the test items with unchanged stress are allowed to be simplified.
5.1.3 Sample extraction and quantity
The samples for identification inspection shall be randomly selected from the finalized batch products. When the design is finalized, the batch products shall not be less than 250 units. When the production is finalized and the design and production are finalized at one time, the batch products shall not be less than 2000 units. 5.1.4 Determination of qualified inspection
If all the inspection items are qualified, the identification inspection is judged to be qualified. 5.1.5 Processing of inspection results
For the unqualified items in the inspection, the reasons shall be found out in time, improvement measures shall be proposed, and the test of the item and related items shall be repeated until they are qualified.
5.2 Acceptance inspection
5.2.1 Purpose
Acceptance inspection is the factory inspection of the products that have been continuously produced in the workshop by the quality inspection department of the production plant, or the acceptance inspection of the products produced by the production plant (hereinafter referred to as the "delivery party") by the commercial department (hereinafter referred to as the "receiving party"). 5.2.2 Inspection Items
Inspection items include unpacking inspection, safety test and measurement of main electrical properties at room temperature. 5.2.2.1 Unpacking Inspection
Use visual inspection and hand feeling to inspect the packaging quality, completeness, appearance quality and function of each item. See Table A1 in Appendix A (Supplement) for inspection contents.
5.2.2.2 Safety Inspection at Room Temperature
See Table A2 in Appendix A (Supplement) for inspection contents. 5.2.2.3 Performance Measurement at Room Temperature
See Table 4 for measurement items.
GB/T14859—93
Table 4 Main electrical performance measurement items
Test items
Image channel noise limit sensitivity
Automatic gain control static characteristics
Selectivity
Power consumption
Audio channel noise limit sensitivity
Maximum useful electrical output power of audio channel
5.2.3 Sampling plan, inspection level, qualified quality level provisions Table 1
Parameters and methods
Serial number 1
Serial number 2
Serial number 6
Serial number 18
Serial number 21
Serial number 22
5.2.3.1 Unpacking inspection, sampling plan for main electrical properties at room temperature shall comply with the relevant provisions of GB2828, see Table 5. Table 5 Sampling plan for unpacking inspection and main electrical properties at room temperature Inspection items
Unpacking inspection
Main electrical properties at room temperature
Performance measurement
Qualified quality level (AQL)
Major nonconforming products
Minor nonconforming products
Inspection level
Special S-1
Sampling plan
Once or twice
5.2.3.2 When it is determined by the judgment array of the secondary sampling that the second sample test is required, all the same test items as the first sample should be repeatedly inspected.
5.2.3.3 Check the safety of all samples at the same time as the unpacking inspection. 5.2.3.4 Samples are randomly selected from the batch submitted for inspection. The time of sampling can be during the batch formation process or after the batch is formed. 5.2.3.5 The strictness of the sampling plan shall comply with the relevant provisions of Article 4.6 of GB2828. 5.2.4 Defect classification
a. Fatal defects are defects that are dangerous or unsafe for people who use, repair or keep the product; b. Major defects (A) do not constitute fatal defects, but can cause failures or seriously reduce the practical performance of the product or violate national quality management regulations;
Minor defects (B) do not constitute fatal or serious defects, but only have a slight impact on the practical performance of the product. c.
5.2.5 Criteria for determining defects
5.2.5.1 When determining defects, dependent defects (referring to other defects caused by a certain defect) should not be taken into account. 5.2.5.2 Unpacking inspection defect judgment criteria shall be in accordance with Appendix A (Supplement) Table A1, and the number of major and minor defects shall be counted for each sample, and then according to the provisions of Article 5.2.6, determine which category of non-conforming products the sample belongs to. 5.2.5.3 The criteria for judging defects in safety inspections shall be in accordance with Table A2 in Appendix A (Supplement). 5.2.5.4 The main performance defects at room temperature shall be calculated in units of test items, and all unqualified products shall be judged as major defects. 5.2.6 Judgment of qualified and unqualified products
When there are no fatal defects, the samples shall be divided according to the following provisions: All products with major defects (one or more) and possibly minor defects shall be judged as major unqualified products, a.
All products with minor defects (one or more) but no major defects shall be judged as minor unqualified products; b.
Products without any defects shall be judged as qualified products. 5.2.7 Judgment of qualified and unqualified inspection batches 5.2.7.1 Judgment of qualified inspection items
GB/T14859-93
a. When there is a fatal defect in the safety inspection results, the batch of products shall be judged as an unqualified batch. b. When a single sampling plan is adopted, if the number of unqualified products in the sample is less than or equal to the qualified judgment number (A) corresponding to the sampling plan, the inspection item is judged to be qualified; if the number of unqualified products in the sample is greater than or equal to the unqualified judgment number (R) corresponding to the sampling plan, the inspection item is judged to be unqualified. c. When a double sampling plan is adopted, if the number of unqualified products found in the first sample is less than or equal to the qualified judgment number (A1) corresponding to the sampling plan, the inspection item is judged to be qualified; if the number of unqualified products in the sample is greater than or equal to the unqualified judgment number (R1) corresponding to the sampling plan, the inspection item is judged to be unqualified. If the number of unqualified products found in the first sample is greater than the first qualified judgment number (A) but less than the first unqualified judgment number (R1), the second sample is inspected. When the sum of the number of unqualified products found in the first sample and the second sample is less than or equal to the second qualified judgment number (A2), the inspection item is judged to be qualified. On the contrary, if it is greater than or equal to the second unqualified judgment number (R2), the item is judged to be unqualified. 5.2.7.2 Determination of qualified inspection lot
If all inspection items are qualified, the inspection lot is deemed qualified. 5.2.8 Handling of inspection results
5.2.8.1 Qualified lot
The receiving party shall accept it.
5.2.8.2 Unqualified lot
Products judged as unqualified lot due to fatal defects shall be rejected, and the delivering party shall rework all the products and conduct full inspection. a. The receiving party shall conduct random inspection on the resubmitted lot. If fatal defects are found again, the acceptance shall be stopped and rectification shall be carried out. b. Products judged as unqualified lot due to other types of defects shall be rejected, and the delivering party shall rework the lot. After full inspection, resubmit for random inspection. If still rejected, rework again until it is accepted. If fatal defects are found in the resubmitted lot, it shall be handled in accordance with Article 5.2.8.2a.
5.2.9 Sample processing
Samples that have passed the delivery inspection and passed the inspection can be delivered to the recipient as qualified products after repackaging. Any defective samples must be repaired by the delivery party and can only be repacked and delivered to the recipient after passing the re-inspection. 5.3 Routine inspection
5.3.1 Purpose
Routine inspection is the periodic sampling of samples from continuous batches of products by the quality inspection department of the production plant or the higher-level competent department for inspection to determine whether the production process can ensure the continuous and stable quality of the products. 5.3.2 Inspection cycle, items and procedures
5.3.2.1 The inspection cycle, items and procedures are shown in Table 6 and Figure 1 respectively. Table 6 Inspection items and cycles
Measurement of electrical, optical and acoustic properties at room temperature
Environmental test
Reliability test
Interference characteristic test
Safety test
Cycle is not less than (month)
GB/T14859-93
Deep electrical, optical, parts
Hhte i
Study test control
To conduct full inspection
During the unpacking inspection of each unit, if unqualified products are found, the qualified unit products randomly selected will be replaced. Figure 1 Routine inspection procedure
Work in the same way
5.3.2.2 If the interval between continuous batch production of products is more than six months, routine inspection shall be carried out when resuming production, and the inspection items shall be electrical, optical, acoustic performance and environmental tests.
5.3.2.3 When the main design process and raw materials of the product are changed, the relevant items in Table 6 shall be inspected. 5.3.3 Inspection content and method
5.3.3.1 The content and method of unpacking inspection are the same as those in Article 5.2.2.1. 5.3.3.2 The inspection content and measurement method of electrical, optical and acoustic performance at room temperature shall be carried out in accordance with Article 4.2 of this standard. 5.3.3.3 The content and method of environmental testing shall be carried out in accordance with Article 4.6 of this standard. 5.3.3.4 The content and method of safety testing shall be carried out in accordance with Table 7. When the main design, process, components and raw materials of the product are changed and may affect the safety performance of the product, the relevant items specified in Article 4.4 of this standard shall be inspected. Table 7 Safety test contents and methods
Ionizing radiation
Test items
Electric shock hazard under normal working conditions
Insulation requirements
Fault conditions
External soft wire
Fire protection of TV sets
5.3.3.5 The contents and methods of interference characteristic tests shall be carried out in accordance with the provisions of Article 4.3.1 of this standard. 5.3.3.6 The requirements and methods of reliability tests shall be carried out in accordance with the provisions of Article 4.7 of this standard. 5.3.4 Sampling plan
Test method (GB8898)
5.3.4.1 The sampling plan for room temperature electrical, optical, acoustic performance, interference characteristics and environmental tests shall be implemented in accordance with the provisions of GB2829, see Table 8.10
Test items
Room temperature performance
Environmental test
Interference characteristics
GB/T14859-93
Table 8 Judgment level, sampling plan and unqualified quality level Unqualified quality level (RQL) and judgment group weight
Unqualified products
5.3.4.2 The safety test sample is 1 set.
Unqualified products
5.3.4.3 The test plan for reliability test shall be carried out in accordance with the provisions of SJ2596. Number of samples
Discrimination level
Sampling plan
5.3.4.4 Samples for routine inspection shall be randomly selected from the qualified batches of delivery inspection. The samples of the secondary sampling plan shall be drawn at one time. 5.3.5 Defect classification and judgment criteria
5.3.5.1 Defect classification and judgment criteria are the same as those in Article 5.2.4. 5.3.5.2
Defects of electrical, optical and acoustic properties at room temperature are divided into two categories: major and minor. For defect classification, see Table B1 in Appendix B (Supplement). All unqualified parameters of interference characteristic measurement are judged as major defects. 5.3.5.3
5.3.5.4 Environmental test defect criteria
After each condition test, the defect criteria for appearance, structure and function shall be in accordance with the relevant provisions of Appendix A (Supplement) Table A1 and Appendix B (Supplement) Table B2;
b. The defect criteria for electrical performance parameters shall be in accordance with the relevant provisions of Appendix B (Supplement) Table B1. 5.3.6 Determination of qualified and unqualified products
Same as Article 5.2.6 of this standard.
5.3.7 Determination of qualified and unqualified products in inspection batches 5.3.7.1 Determination of qualified inspection items
If one item in the safety test is unqualified, the routine inspection shall be judged as unqualified; b. Reliability requirements shall be judged in accordance with Article 4.7.1 of this standard, c. The qualified judgment of electrical, optical, acoustic performance, interference test and environmental test is shown in Table 8. 5.3.7.2 Qualified judgment of inspection batch
If all inspection items are qualified, the inspection batch is judged to be qualified. 5.3.8 Handling of inspection results
5.3.8.1 Qualified batch
The routine inspection has passed.
5.3.8.2 Unqualified batch
a. If the routine inspection fails, the delivery inspection will be suspended. The delivered products will be resolved through negotiation between the delivery parties; b. The delivery party shall immediately take improvement measures. After the improvement, re-sample from the newly produced products and inspect the unqualified inspection items. Normal production and inspection can only be resumed after obtaining qualified conclusions. 5.3.9 Handling of samples
Samples that have passed safety tests, reliability tests and environmental tests cannot be delivered and used as qualified samples. 11
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