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GB 13837-2012 English PDF (GB13837-2012)

GB 13837-2012 English PDF (GB13837-2012)

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GB 13837-2012: [GB/T 13837-2012] Sound and television broadcast receivers and associated equipment. Radio disturbance characteristics. Limits and methods of measurement

This standard specifies the measurement methods for sound and television receivers and related equipment, as well as the limits for the control of harassment from such equipment.
GB 13837-2012
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 33.100.01
L 06
Replacing GB 13837-2003
Sound and television broadcast receivers and
associated equipment - Radio disturbance
characteristics - Limits and methods of measurement
(IEC/CISPR 13:2009, MOD)
Changed to recommended standard according to the Announcement
No.7 in 2017 by the Standardization Administration of China
ISSUED ON: DECEMBER 31, 2012
IMPLEMENTED ON: JULY 01, 2013
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative references ... 6
3 Terms, definitions, abbreviations ... 7
3.1 Terms and definitions ... 7
3.2 Abbreviations ... 8
4 Disturbance limits ... 9
4.1 Overview ... 9
4.2 Disturbance voltage at the power supply terminal ... 9
4.3 Disturbance voltage at the antenna ... 10
4.4 Useful signal and disturbance signal voltage at RF output of equipment with integrated or additional RF image modulator ... 11
4.5 Disturbance power ... 11
4.6 Radiated disturbance ... 12
4.7 Radiated power ... 12
5 Measurement method ... 13
5.1 Overview ... 13
5.2 Test signal ... 13
5.3 Disturbance voltage at the power supply terminal in the frequency range of 150 kHz ~ 30 MHz ... 15
5.4 Measurement of disturbance voltage at the antenna end of receivers and related equipment with RF input in the frequency range of 30 MHz ~ 2.15 GHz 18 5.5 Measurement of useful signal and disturbance voltage at the RF output of relevant equipment with RF image modulator in the frequency range of 30 MHz ~ 2.15 GHz ... 19
5.6 Measurement of disturbance power of related equipment (except video recorders) in the frequency range of 30 MHz ~ 1 GHz ... 20
5.7 Measurement of radiation field strength by 3m method in the frequency range of 30 MHz ~ 1 GHz ... 22
5.8 Radiation measurement in the frequency range of 1 GHz ~ 18 GHz ... 26 5.9 Measurement of local frequency power at the input of outdoor unit ... 29 6 Explanation of CISPR radio disturbance limit... 29
6.1 Standard compliance... 29
6.2 Significance of limits ... 29
6.3 Compliance limit values on a statistical basis ... 29
Appendix A (Normative) Digital signal broadcasting receiver ... 37
Appendix B (Informative) Basic information of digital television useful signals) ... 42
Appendix C (Informative) Settings of flat-panel TV receiver ... 44
Sound and television broadcast receivers and
associated equipment - Radio disturbance
characteristics - Limits and methods of measurement
1 Scope
This standard specifies the measurement methods for sound and television receivers and related equipment, as well as the limits for the control of harassment from such equipment.
For multifunctional equipment, it shall meet the requirements of this standard and/or other standards, see 4.1.
This standard is applicable to the electromagnetic energy generated by the sound of broadcasting and similar transmissions and television receivers and related equipment; the frequency range is 9 kHz ~ 400 GHz.
Frequencies without specified limits do not need to be measured.
The receiving system used for collective reception, especially the front end of the cable distribution system (shared antenna TV, CATV) and the shared
receiving system (main antenna TV, MATV) belong to the category of GB 13836. See Appendix A and Appendix B for the requirements of broadcast receivers for receiving digital signals.
It does not include information technology equipment (ITE), even if it is connected to a television receiver.
The telecommunications port connecting the broadcast receiver to the
telecommunications network belongs to the scope of GB 9254.
In addition, when the telecommunication port has a broadcast receiving function, the broadcast receiving function that can be independent of the
telecommunication function shall be measured separately, meanwhile the
telecommunication function does not work during the measurement.
The PC tuner card shall be measured in accordance with the corresponding clauses of this standard.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard.
GB/T 3174 PAL-D system TV broadcasting technical specification
GB/T 4365 Electrotechnical terminology - Electromagnetic compatibility
(GB/T 4365-2003, IEC 60050 (161):1990, IDT)
GB 4824-2004 Industrial, scientific and medical (ISM) radio-frequency
equipment - Electromagnetic disturbance characteristics - Limits and
methods of measurement (IEC/CISPR 11:2003, IDT)
GB/T 6113.101 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-1: Radio disturbance and immunity
measuring apparatus - Measuring apparatus (GB/T 6113.101-2008,
IEC/CISPR 16-1-1: 2006, IDT)
GB/T 6113.102 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-2: Radio disturbance and immunity
measuring apparatus - Ancillary equipment - Conducted disturbance (GB/T 6113.102-2008, IEC/CISPR 16-1- 2:2006, IDT)
GB/T 6113.103 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-3: Radio disturbance and immunity
measuring apparatus - Ancillary equipment - Disturbances power (GB/T
6113.103-2008, IEC/CISPR 16-1- 3:2004, IDT)
GB/T 6113.104 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-4: Radio disturbance and immunity
measuring apparatus - Ancillary equipment - Radiated disturbance (GB/T
6113.104-2008, IEC/CISPR 16-1- 4:2005, IDT)
GB/T 6113.202 Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-2: Methods of measurement of disturbances and immunity - Measurement of disturbance power measurement (GB/T
6113.202-2008, IEC/CISPR 16-2-2 :2004, IDT)
GB/Z 6113.403 Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-3: Uncertainties statistics and limit
modelling - Statistical considerations in the determination of EMC
compliance of bulk products (GB/Z 6113.403-2007, IEC/CISPR 16-4-3:2004, IDT)
GB 9254 Information technology equipment - Radio disturbance
characteristics - Limits and methods of measurement (GB 9254-2008,
IEC/CISPR 22:2006, IDT)
GB 13836 Distribution systems for television and sound signals - Part 2: Electromagnetic compatibility of equipment (GB 13836-2000, IEC 60728-
2:1997, NEQ)
GB/T 17309.1-1998 Methods of measurement on receivers for television
broadcast transmissions Part 1: General considerations Electrical
measurements at radio and video frequencies and measurements on display performance (idt IEC 60107-1:1995)
SJ/T 11348-2006 Methods of measurement for digital television flat panel displays
3 Terms, definitions, abbreviations
3.1 Terms and definitions
The terms and definitions as defined in GB/T 4365 as well as the following terms and definitions apply to this document.
3.1.1
Sound broadcast receivers
The equipment used for receiving terrestrial, cable and satellite transmission of sound broadcasting and similar services, the input signal of which may be analog or digital.
3.1.2
Television receivers
The equipment used for receiving terrestrial, cable and satellite television broadcasting and similar services, the input signal of which can be analog or digital.
3.1.3
Associated equipment
A device directly connected to a sound or television receiver, or a device capable of generating or reproducing audio or video information.
ITE: Information technology equipment
ITU-R: International telecommunication union-radio
LW, MW and SW: Long wave, medium wave and short wave
MATV: Main antenna TV
PC: Personal computer
RF: Radio frequency
4 Disturbance limits
4.1 Overview
When the method given in Chapter 5 is used for measurement, the RF
disturbance level shall not be greater than the limit specified in 4.2 ~ 4.7. At the boundaries of the two frequency ranges overlap, the lower limit shall be used. For mass-produced equipment, at least 80% of the products meet the limit requirements with 80% confidence (see Chapter 6).
At the same time, the multi-function equipment that belongs to the requirements of different clauses of this standard and/or other standards can realize each function without changing the inside of the equipment, the test shall be carried out independently under each function. When each function of the equipment meets the requirements of the corresponding clauses/standards, the equipment is considered to meet the requirements of all clauses/standards.
For equipment that cannot achieve independent operation of each function during the test, or the independent operation of a special function will cause the basic functions of the equipment to be impossible, at this time, if the basic operating functions necessary for the equipment meet the requirements of the corresponding clauses/standards, the equipment is considered to meet the requirements.
The RMS-average limit is newly introduced. In case of dispute, the quasi- peak/quasi-peak and average measurement results shall prevail.
4.2 Disturbance voltage at the power supply terminal
It shall be measured according to 5.3. The limits are as shown in Table 1. frequency shall meet the requirements of the corresponding system.
For teletext, preferably use several rows of digital graphics that fill the screen, as shown in Figure 2. If there is no such graphic, the main index page of the national teletext broadcasting service shall be used as the test figure when measuring, which shall be indicated in the measurement result.
For radio receivers, the standard test signal is:
a) FM: RF mono signal, 1 kHz, FM, frequency deviation 37.5 kHz;
b) LW/MW/SW: RF signal, 1 kHz, AM, modulation degree 50%;
For related equipment, the standard test signal is:
a) Audio amplifier and infrared headphones: 1 kHz sinusoidal signal;
b) Audio-related equipment, such as tape recorders, audio players, CD
players: pre-recorded tapes or records with 1 kHz audio signals, the
standard sound signal level is in accordance with the requirements of the manufacturer of the tested equipment;
c) Video-related equipment, such as video recorders, cameras, laser video disc players and other video disc players: pre-recorded tapes or video
discs with standard color bar TV signals with 1 kHz audio signals; the
standard sound signal level is based on the requirements of the tested
equipment manufacturer;
d) Electronic musical instrument: Use the signal generated by pressing the high-pitched C key (about 523 Hz);
e) Infrared remote control: The typical control function continuously emits. For the equipment for which this standard does not clearly specify its useful signal (for example, digital signal broadcast receivers, decoders, etc.), the nominal signal as specified in the product standard or equipment manufacturer shall be used during the test. The manufacturer shall specify the input signal used for the test in its technical report.
The infrared remote-control device shall be tested together as a part of the main equipment. The infrared remote control sold separately only measures the radiation disturbance (see Table 5).
Adjust the control buttons such as contrast, brightness and color saturation, to produce a standard image.
The brightness values are as follows:
Black bar: 2 cd/m2
Magenta bar: 30 cd/m2
White bar: 80 cd/m2
Note 1: If the brightness value of the magenta strip in the test pattern does not reach the specified value, its brightness shall be set as large as possible, meanwhile the actual brightness value shall be indicated in the measurement result.
Note 2: Refer to Appendix C for the display settings of the flat-panel TV receiver. A television receiver with a teletext device shall be tested in a teletext mode; the receiver displays a teletext image.
5.3.3 Sound receiver
The standard test signal used for the sound receiver is as specified in 5.2. AM sound receivers are equipped with ferrite antennas or whip antennas. At this time, the radiating antennas in Figures 5 and 6 shall be replaced with loop radiating antennas or rod-shaped radiating antennas.
The volume control of the receiver under test shall be adjusted to 1/8 of the rated audio output power; other controllers shall be placed in the middle or neutral position; the output end shall be terminated with a resistor equal to the rated load impedance.
When the rated load impedance of the equipment under test has a certain range, select the rated load value that maximizes the output power of the device. AM/FM sound receiver shall be measured in FM mode.
5.3.4 Related equipment
The standard test signal of the relevant equipment shall be as specified in 5.2. For the relevant equipment with RF input, measure it according to the
corresponding TV or sound receiver.
The module unit (for example, tuner, frequency converter, RF amplifier, RF equalizer, monitor, etc.) used to realize the unique functions of sound or TV has a ground terminal, the terminal shall be grounded for measurement.
5.4 Measurement of disturbance voltage at the antenna end of
receivers and related equipment with RF input in the frequency
range of 30 MHz ~ 2.15 GHz
5.4.1 Overview
When measuring the disturbance voltage at the antenna end of the equipment under test, an auxiliary signal generator is used to feed the RF signal (see 5.2) to the receiver under test or the RF input of the relevant equipment; the frequency is tuned to make the equipment under test in a normal working state. According to the provisions of GB/T 6113.101, use a measurement receiver with a quasi-peak detector, or as an alternative method, use a measurement receiver with an RMS-average detector for measurement.
Adjust the output level of the auxiliary signal generator to correspond to 75 ?? impedance, so that the signal level at the FM receiver antenna input end is 60 dB??V, meanwhile the signal level at the TV receiver antenna input end is 70 dB??V.
For FM receivers, the auxiliary signal shall be an unmodulated carrier. 5.4.2 Measurement of receiver or related equipment with coaxial antenna input connector
Use a coaxial cable and a resistive hybrid network which has a minimum
attenuation of 6 dB to connect the antenna end of the equipment under test, the auxiliary signal generator and the interference measuring instrument, as shown in Figure 7.
The impedance seen from the equipment under test to the hybrid network shall be equal to its nominal antenna input impedance.
Tune the equipment under test to receive useful signals.
Tune the interference measuring instrument to the corresponding disturbance frequency; the measured disturbance level shall consider the attenuation value from the antenna end of the equipment under test to the input end of the interference measuring instrument.
Note 1: Measures shall be taken to prevent the RF current flowing from the housing of the equipment under test to the surface of the outer conductor of the 5.5.2 Measurement method
Use a coaxial cable and a matching network (if necessary) to connect the RF output end of the equipment under test with the input end of the interference measuring instrument, as shown in Figure 9. The characteristic impedance of the coaxial cable shall be the same as the nominal output impedance of the equipment under test.
According to the provisions of GB/T 6113.101, use a measurement receiver with a quasi-peak detector, or as an alternative method, use a measurement receiver with an RMS-average detector for measurement.
The equipment under test shall generate an RF modulated carrier; its video modulated signal is a vertical color bar signal (see Figure 1).
The indication value of the interference meter (tuned to the image carrier and its harmonics) or the spectrum analyzer plus the insertion loss value of the matching network is the RF output level.
5.6 Measurement of disturbance power of related equipment
(except video recorders) in the frequency range of 30 MHz ~ 1
GHz
5.6.1 Overview
Generally, when the frequency exceeds 30 MHz, the disturbance energy
generated by the device is transmitted to the disturbed receiver through radiation.
Experience has shown that most of the energy is radiated from the power cords and other connections close to the equipment. Therefore, the disturbance power on the power cord of the equipment under test and other connections can be used to define its disturbance level.
This power is approximately equal to the measured value at the position where the absorbed power is the maximum by the suitable absorbing clamp fitted on these wires.
5.6.2 Measurement method
The method is suitable for measuring the disturbance power generated by the terminals of the related equipment; the measurement result is expressed by the effective power; the frequency range is 30 MHz ~ 1 GHz.
For those interconnection wires whose original length is less than half the wavelength of the lowest frequency measured, and the end of the wire is connected to the unit without any additional wires, the moving distance of the absorbing clamp is limited to the length of the original wire.
According to the manufacturer's instructions, only the interconnection wires longer than the absorption clamp are required to be tested.
Note: When starting the measurement, the absorption clamp can be determined at a certain position, then the measuring instrument can be adjusted to find the frequency point with particularly strong disturbance.
5.6.4 Presentation of measurement results
The measurement result is expressed in dBpW. It depends on the maximum
value indicated by the interference meter and the calibration curve of the insertion loss of the absorbing clamp.
The disturbance power level shall be the maximum value measured on the
power line or other connection at each measurement frequency.
5.7 Measurement of radiation field strength by 3m method in
the frequency range of 30 MHz ~ 1 GHz
5.7.1 Overview
The method is suitable for measuring the radiation of FM receivers, television receivers, video recorders, etc. (see Table 5), expressed in terms of electric field strength. This method is used for measurements in outdoor or indoor venues with specialized facilities.
Here, the measurement method can be done in a large room without reflection treatment or in an outdoor field with a non-metallic weather protection cover (for example, a radome or a closed plastic cover, etc.); these fields shall meet the requirements of 5.7.2.
During rain or snow, the outdoor climate protection site cannot be used, unless the site attenuation test is passed, to prove that there is no significant change in the site's RF conditions under such weather conditions.
Note: It is necessary to re-test the site attenuation regularly (appropriate period), to determine the impact of air pollution on the RF characteristics of the outdoor site covered by the pl...

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