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GB/T 17737.1-2013 English PDF (GBT17737.1-2013)

GB/T 17737.1-2013 English PDF (GBT17737.1-2013)

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GB/T 17737.1-2013: Coaxial communication cables -- Part 1: Generic specification -- General, definitions and requirements

GB/T 17737.1-2013
Coaxial communication cables.Part 1. Generic specification.General, definitions and requirements ICS 33.120.10
L26
National Standards of People's Republic of China
Partially replace GB/T 17737.1-2000, GB/T 12269-1990
Coaxial communication cables - Part 1. General specification
General rules, definitions and requirements
Coaxialcommunicationcables-Part 1. Genericspecification-
General, definitionsandrequirements
(IEC 61196-1.2005, IDT)
Released on.2013-12-17
2014-06-15 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued
Foreword
GB/T 17737 "Coax Communication Cable" is divided into the following parts. --- Part 1. General rules, definitions and requirements;
--- Part 2. Polytetrafluoroethylene (PTFE) insulated semi-rigid RF coaxial cable sub-specification; --- Part 3. The specification for coaxial cable for local area networks; --- Part 4. Leakage cable sub-specification;
--- Part 5. CATV trunk and distribution cables are divided into specifications. This part is the first part of GB/T 17737.
This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part replaces GB/T 17737.1-2000 "RF Cables Part 1. General Specifications, Definitions, Requirements and Tests Law and GB/T 12269-1990 "General Specification for Radio Frequency Cables". Compared with GB/T 17737.1-2000, the main technical changes in this section are as follows. ---Modified the name of the standard (see cover and front page,.2000 version cover and home page); --- Removed attenuation distortion, group delay distortion, impedance uniformity measurement, phase distortion, impedance uniformity and transmission distortion in Chapter 3. Definition (see Chapter 3, Chapter 3 of the.2000 edition);
--- Increased characteristic impedance, average characteristic impedance, impedance non-uniformity, shielding efficiency, capacitive coupling, shielding attenuation, self-supporting cable, Definition of overhead cables and suspension lines (see Chapter 3);
--- Increased the nominal conductivity level of copper clad steel wire (see 4.4.1); --- Revised the minimum tensile strength of the copper-clad steel wire with a nominal conductivity of 30% (see 4.4.1,.2000 version 5.5.1); --- Increased tensile strength and elongation at break (see 4.5.2);
--- Increased the structure of the outer conductor or shield [see g. in 4.6.1]; --- Added cable model naming method (see Appendix NA).
Compared with GB/T 12269-1990, the main technical changes in this section are as follows. --- Revised the contents of "Model, Term Explanation and Definition" (see Appendix NA, Chapter 3 of the.1990 edition); ---Modified the contents of the "cable structure" (see Chapter 4, Chapter 5 of the.1990 edition). This part uses the translation method equivalent to IEC 61196-1.2005 "Coaxial Communication Cables Part 1. General Specifications, Definitions and Claim".
This section has made the following editorial changes.
--- Added informative Appendix NA to provide guidance for model naming of domestic products; --- Removed the duplicate b) in 6.3.
The documents of our country that have a consistent correspondence with the international documents referenced in this part are as follows. GB/T 2951.11-2008 General Test Methods for Insulating and Sheathing Materials for Cables and Cables - Part 11. General Test Method Mechanical properties test for thickness and dimensions measurement (IEC 60811-1-1.2001, IDT) GB/T 2951.41-2008 General Test Methods for Insulating and Sheathing Materials for Cables and Cables - Part 41. Polyethylene and Poly Specific test methods for propylene mixtures - Environmental stress cracking test - Melt index measurement method - Direct combustion method Carbon black and/or mineral filler content in olefins, thermogravimetric analysis (TGA), carbon black content, microscopic evaluation of polyethylene Medium carbon black dispersion (IEC 60811-4-1..2004, IDT)
Please note that some elements of this standard may involve patents. The issuing organization of this standard does not assume responsibility for identifying these patents. This part was proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This part is under the jurisdiction of the National High-Tech Cable and Connector Standardization Technical Committee for Electronic Equipment (SAC/TC190). This section was drafted. The 23rd Research Institute of China Electronics Technology Group Corporation. The main drafters of this section. Zhang Jianping, Wu Xifei, Wu Zhengping. The previous versions of this section partially replace the standard are. ---GB/T 17737.1-1999, GB/T 17737.1-2000, GB/T 12269-1990.
Coaxial communication cables - Part 1. General specification
General rules, definitions and requirements
1 Scope
This part of GB/T 17737 specifies the general rules, definitions and requirements for the design and test methods of coaxial communication cables. This section applies to coaxial communication cables used in radio communication equipment and electronic devices using similar technologies. 2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 2421.1-2008 Overview and guidelines for environmental testing of electrical and electronic products (IEC 60068-1.1988, IDT) GB/T 2951.12-2008 - General test methods for insulating and sheathing materials - Part 12. General test methods Thermal aging test method (IEC 60811-1-2. 1985, IDT)
GB/T 17650.1-1998 Test methods for gases emitted from burning of cables or cables - Part 1 Determination of total amount (IEC 60754-1..1994, IDT)
GB/T 17650.2-1998 Test methods for gases released from burning by cables or cables - Part 2. Measurements pH and conductivity to determine the acidity of gases (IEC 60754-2.1991, IDT) GB/T 18380 (all parts) Burning test of cables and cables under flame conditions [IEC 60332 (alparts)] IEC 60028. 1925 International Standard of Resistance for Copper (International Standard of Resistance for Copper) IEC 60068-2-20.1979 Amendment 2 Environmental Test Part 2. Test Test T. Soldering (Environmental testing-Part 2.Tests-TestT.Soldering)
Tests for cables and cables of cables and cables - Part 11. General test methods for thickness and Dimensional measurement mechanical performance test (Insulatingandsheathingmaterialsofelectricandopticalcables-Com- montestmethods-Part 1-1. Methodsforgeneralapplication-Measurementofthicknessandoveral dimensions-Testsfordeterminingthemechanicalproperties)
Cables and cables for electrical cables and cables - General test methods - Part 41. Polyethylene and polypropylene mixes Specific test methods - Environmental stress cracking test - Melt index measurement method Direct combustion method for the measurement of carbon black and/or minerals in polyethylene Determination of carbon black content by thermogravimetric analysis (TGA) by thermogravimetric analysis (TGA). Evaluation of carbon black dispersion in polyethylene (Insulatingand sheathingmaterialsofelectricandopticalcables-Commontestmethods-Part 4-1.Methodsspecific topolyethyleneandpolypropylenecompounds-Resistancetoenvironmentalstresscracking-Meas- urementofthemeltflowindex-Carbonblackand/ormineralfilercontentmeasurementinpolyethy- lenebydirectcombustion-Measurementofcarbonblackcontentbythermogravimetricanalysis (TGA)-Assessmentofcarbonblackdispersioninpolyethyleneusingamicroscope)
IEC 61196-1 (alparts) coaxial communication cable (Coaxialcommunicationcables) IEC 62153 (alparts) Metallic Communication Cable Test Method (Metaliccommunicationcabletestmethods) 3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Media type dielectrictypes
3.1.1
Air dielectric cable airspaceddielectriccables
An air dielectric cable is an insulating gasket that is placed on the inner conductor at regular intervals or a belt that is spirally fixed to the inner conductor. And/or the outside of the rope, all other media are air cables. This type of cable is characterized by the inner conductor to the outer conductor between the insulating spacers. It may not pass through the solid plastic dielectric layer.
3.1.2
Semi-air media cable semi-airspaceddielectriccables
A semi-air dielectric cable is a gasket or other plastic structure in which the medium is a foamed polymer or insulating tube that holds the conductor in its center. Plastic-air structure cable. This type of cable is characterized by at least one layer of solid plastic medium passing from the inner conductor to the outer conductor. 3.1.3
Solid media cable soliddielectriccables
A solid dielectric cable is a cable in which the space between the inner conductor and the outer conductor is completely filled with a solid plastic medium. The medium can be uniform It can also be combined. The latter consists of two or more materials of different nature concentrically combined. 3.2
Braided braiding
The variables used in the weaving formula are shown in Table 1.
Table 1 Variables of the weaving formula
Variable description
d braided single wire diameter or braid thickness
The average diameter of the Dm braid, ie the outer diameter of the medium is 2.25d L weave pitch
N number of single wires per ingot
For tape weaving, W is the tape width;
For round wire weaving, W is N × d
m total number of spindles
3.2.1
Braided angle braidedangle
The braid angle β refers to the angle between the longitudinal axis of the cable and the tangent of the spiral wound around the braided wire (strand). ==arctan
πDm
3.2.2
Weaving coefficient layfactor
KL
The weaving coefficient refers to the ratio of the length of the braid of the braided wire (strand) to the length of the braided cable. KL= 1 π2 Dmæè
= 1cosβ
3.2.3
Fill factor factoringfactor
The fill factor is defined as.
q= mW2πDm
1 π2 Dmæè
Can also be expressed as.
q= mW2Lsinβ
3.2.4
Weaving density coveragefactor
KC
The relationship between the weave density and the fill factor is.
KC=2q-q2
3.3
Media eccentricityofdielectric
The eccentricity of the medium refers to the amount of change in the thickness of the insulation on the cable cross section (Dx), defined as the thickness of the two insulations on the cross-sectional diameter (Dx). The ratio of the maximum difference (Tmax-Tmin) to the outer diameter of the insulation (Dx), expressed as a percentage. E= Tmax-TminD
×100%
3.4
Ellipticality of media or cable ovalityofdielectricorcable
The ellipticity of the medium or cable means that the ellipticity of the insulation or cable cross section is defined as the maximum difference between the two orthogonal diameters (Dmax- Dmin) is the ratio of its two diameter averages (Dmax Dmin)/2, expressed as a percentage. O= 2
(Dmax-Dmin)
Dmax D
Êê
Úú
Min
×100%
3.5
Impedance impedance
3.5.1
Characteristic impedance characteristicimpedance
The characteristic impedance refers to the ratio of the traveling wave voltage and the traveling wave current traveling in the same direction of the transmission line. 3.5.2
Average characteristic impedance meancharacteristicimpedance
Z∞
The average characteristic impedance is the asymptotic value reached by the characteristic impedance above a sufficiently high frequency (approximately equal to.200 MHz), which is a positive Real number.
Note. At sufficiently low frequencies (approximately equal to 10 MHz), the characteristic impedance can be described by a complex number with a negative phase angle. 3.5.3
Impedance non-uniformity
3.5.3.1
Random impedance non-uniformity randomimpedanceirregularities
Random impedance non-uniformity refers to impedance non-uniformity with non-reproducing characteristics or no correlation law found. Note. These inhomogeneities have significant statistical characteristics in conventionally manufactured cables. This non-uniformity affects the broadband characteristics of the transmission. 3.5.3.2
Periodic impedance non-uniformity periodicimpedanceirregularities
The periodic impedance non-uniformity is the impedance non-uniformity caused by the distance physical deformation of the cable caused by manufacturing or cable structure deviation. Note. Even if the non-uniformity is small, the transmission performance will be affected at discrete frequency points or the input noise will be significantly increased in digital signal detection. 3.5.3.3
Local impedance non-uniformity localimpedanceirregularities
Local impedance non-uniformity refers to the difference in impedance between the two ends of the cable (input) that are connected together, which may be due to defects at the joint or The cable is partially damaged and increases.
3.6
Speed ratio (relative propagation speed) velocityratio(relativepropagationvelocity) The speed ratio is the ratio of the speed of a signal in a cable to its speed in free space. 3.7
Rated power
The rated power of the cable is that it can work continuously at any specified frequency and ambient temperature without exceeding the maximum allowable operating voltage. The input power does not exceed the maximum allowable temperature of the inner conductor. Under these conditions, the cable should be terminated with a load that is consistent with its characteristic impedance. 3.8
Shielding efficiency screeningeffectiveness
3.8.1
Transfer impedance transferimpedance
ZT
Transfer impedance refers to a longitudinal cable (U2) induced by a short cable with a short electrical length in the outer loop (environment) and the inner loop (electrical The ratio of current (I1) in the cable), or vice versa. It is related to the unit length. ZT= U2I1×L
In the formula.
L --- coupling length.
3.8.2
Capacitive coupling capacitivecoupling
YC
Capacitive coupling is the current (I1) caused by capacitive coupling in the inner loop of a uniform cable with a short electrical length and the voltage in the outer loop. The ratio of (U2), which is related to the unit length.
YC= I1U2×L=j
ωCT
In the formula.
CT --- through the capacitor;
L --- coupling length.
3.8.3
Shielding attenuation screeningattenuation
As
Shielding attenuation is a suitable criterion for the shielding efficiency of cables with longer electrical lengths, which is the maximum peak value of power Pfeed and radiation fed into the cable. The logarithm of the power Prad,max ratio.
As=10lg PfeedPrad,max
For cables with longer electrical lengths, the shielding attenuation is proportional to the length and frequency of the cable shield. Frequency independent.
3.9
Self-supporting cable messengeredcable
Self-supporting cables are cables (usually outdoor cables) with separate support elements. 3.10
Overhead cable aerialcable
An overhead cable is a cable (usually an outdoor cable) that is mounted on a pole or other cable support member. 3.11
Suspension line messenger
Suspension lines are cable support elements of metallic or other suitable materials. 4 Materials and cable construction
4.1 General
Unless otherwise specified, all physical measurements shall be made under the standard atmospheric conditions of the test specified in Clause 5 of GB/T 2421.1-2008. get on.
4.2 Visual inspection
A visual inspection should be performed to ensure that there are no visible defects on the cable. Apply normal vision or correct vision when performing an examination, but not magnifier.
4.3 Dimensional measurement
The measurement of thickness and diameter shall be carried out in accordance with the provisions of Chapter 8 of IEC 60811-1-1. 4.4 Cable Structure - Inner Conductor
4.4.1 Conductor material
For solid copper conductors, the conductor shall consist of annealed or hard-drawn copper wire with uniform quality and no defects. The characteristics of copper should be consistent with IEC 60028. 1925.
As an alternative material, the conductor can also be a copper clad steel wire. The copper coating shall be continuous and adhered to the steel conductor; the section shall be circular, For the copper-clad steel wire with 21%, 30% and 40% nominal conductivity grades, the maximum resistance should not exceed IEC 60028.1925 The specified copper conductors are 4.8, 3.5 and 2.8 times the specified value. Elongation at break when tested in accordance with the test method specified in IEC 61196-1-308 Should be no less than 1%. For 21%, 30% and 40% nominal conductivity grades of copper clad steel, the minimum tensile strength shall be 827N/ Mm2, 792N/mm2 and 760N/mm2.
The conductor can also be a copper clad aluminum wire. The copper cladding shall be continuous and adhered to the aluminum conductor and its maximum resistance shall not exceed IEC 60028. The copper conductor specified in 1925 is 1.8 times the specified value. Unless otherwise specified in the appropriate sub-specification or detailed specification, when in accordance with IEC 61196-1- Test method specified in 308 When the tensile test is carried out, the elongation at break shall be not less than 1%. Other conductor materials and metal cladding (where applicable) shall be specified in the appropriate sectional or detail specification. 4.4.2 Inner conductor metal coating
The metal cladding of the conductor (where applicable) shall be specified in the appropriate sub-specification or detailed specification. 4.4.3 Thickness of conductor cladding
The thickness of the conductor cladding (if applicable) shall be specified in the corresponding sub-specification or detailed specification. 4.4.4 Structure of inner conductor
The structure and materials of the inner conductor shall be specified in the corresponding sub-specifications or detailed specifications. When the inner conductor is a single wire or tubular structure, there should be no joint after the final drawing. The single-wire joint of the inner conductor of the stranded copper wire shall be cold-welded, brazed or silver-welded with non-acid flux. The diameter of the single wire after welding shall not increase, and there is no Raised.
The distance between each single wire joint and any other single wire joint shall not be less than 0.3m. Samples of copper single wire or copper tubing removed from the finished cable should have no visible discoloration. If the conductor is tinned, it should be free of flux and Cleaning things.
4.4.5 Solderability
The weldability of the solderable conductor (when applicable) shall be checked in accordance with the solder bath method specified in 4.6 of IEC 60068-2-20. Inactive help should be used Flux.
4.5 Media
4.5.1 Type
The type of media required for each cable shall be specified in the appropriate cable sub-specification or detailed specification. Media outer diameter, ellipticity and eccentricity should Given in the corresponding sub-specification or detailed specification. 4.5.2 Tensile strength and elongation at break
The tensile strength and elongation at break of solid dielectric materials shall be in accordance with IEC 60811 when required in the respective sub-specifications or detailed specifications. Test specified in 1-1.
When required in the correspond...

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