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HJ 1136-2020: Monitoring method for electromagnetic radiation environment of medium wave broadcasting transmitting station
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Monitoring method for electromagnetic radiation environment of medium wave broadcasting transmitting station
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HJ 1136-2020
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Basic data | Standard ID | HJ 1136-2020 (HJ1136-2020) | | Description (Translated English) | Monitoring method for electromagnetic radiation environment of medium wave broadcasting transmitting station | | Sector / Industry | Environmental Protection Industry Standard | | Classification of Chinese Standard | N56;Z33 | | Word Count Estimation | 14,145 | | Date of Issue | 2020-10-27 | | Date of Implementation | 2020-12-30 | | Older Standard (superseded by this standard) | HJ/T 10.2-1996 (Partly) | | Regulation (derived from) | Ministry of Ecology and Environment Announcement No. 45 [2020] | | Issuing agency(ies) | Ministry of Ecology and Environment | HJ 1136-2020: Monitoring method for electromagnetic radiation environment of medium wave broadcasting transmitting station
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Monitoring method for electromagnetic radiation environment of medium wave broadcasting transmitting station
Electromagnetic radiation environment of medium wave broadcasting transmitter station
Monitoring method
National Environmental Protection Standards of the People's Republic of China
Issued by the Ministry of Ecology and Environment
2020-10-27 release
2020-12-30 Implementation
Table of contents
Foreword...II
1 Scope of application...1
2 Normative references...1
3 Terms and definitions...1
4 Monitoring conditions...1
5 Monitoring methods...2
6 Quality Assurance...4
Appendix A (informative appendix) The electromagnetic radiation environment monitoring record and report format of the medium wave broadcasting transmitting station...5
Foreword
In order to implement the "Environmental Protection Law of the People's Republic of China", protect the environment, and prevent environmental pollution from electromagnetic radiation, standardize medium wave broadcast transmitters
Environmental monitoring of electromagnetic radiation has formulated this standard.
This standard specifies the technical requirements for the content and methods of electromagnetic radiation environment monitoring of medium wave broadcasting transmitters. This standard replaces the "Radiation Environment
"Guidelines for Protection and Management of Electromagnetic Radiation Monitoring Instruments and Methods" (HJ/T 10.2-1996) is used as a medium-wave broadcasting transmitter for electromagnetic radiation environmental monitoring
Implementation of standards.
This standard is issued for the first time.
Appendix A of this standard is an informative appendix.
This standard was formulated by the Department of Radiation Source Safety Supervision and the Department of Regulations and Standards of the Ministry of Ecology and Environment.
The main drafting unit of this standard. Radiation Environmental Monitoring Technology Center of the Ministry of Ecology and Environment.
This standard was approved by the Ministry of Ecology and Environment on October 27, 2020.
This standard will be implemented on December 30, 2020; since the date of implementation of this standard, the electromagnetic radiation
According to the provisions of this standard.
This standard is interpreted by the Ministry of Ecology and Environment.
Method for monitoring electromagnetic radiation environment of medium wave broadcasting transmitting station
1 Scope of application
This standard specifies the technical requirements for the content and methods of electromagnetic radiation environmental monitoring of medium wave broadcast transmitters.
This standard applies to the electromagnetic radiation environment monitoring of medium wave broadcasting transmitting stations.
2 Normative references
The content of this standard refers to the terms in the following documents. For undated reference documents, the effective version is applicable to this standard.
HJ 1112 Technical Guidelines for Environmental Impact Assessment Broadcasting and Television
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1 medium wave broadcasting
Sound broadcasting operating in the mid-wave frequency band (526.5kHz～1606.5kHz).
3.2 transmitting station
A radio station consisting of one or more transmitters.
3.3 Electromagnetic radiation environment-sensitive target
Objects that need to be focused on in the environmental impact assessment and monitoring of electromagnetic radiation. Including houses, schools, hospitals, office buildings, factories, etc.
A building where people live, work or study.
4 Monitoring conditions
4.1 Environmental conditions
The environmental conditions during monitoring should meet the requirements for the use of monitoring instruments.
4.2 Monitoring instrument
4.2.1 Basic requirements
4.2.1.1 The working performance of the monitoring instrument should meet the requirements of the electromagnetic field to be measured, and the working frequency can cover the monitored medium wave broadcasting transmitting station.
Transmission frequency.
4.2.1.2 The monitoring instrument adopts a frequency selective electromagnetic radiation monitor; in addition, according to the monitoring purpose, a non-frequency selective broadband electromagnetic radiation monitor can be used at the same time.
4.2.1.3 The monitoring instrument should use a probe (antenna) with an isotropic response, and the support of the monitoring instrument should be made of non-conductive materials that are not susceptible to moisture.
Bracket. When using a non-selective broadband electromagnetic radiation monitor for monitoring, the probe should be placed horizontally.
4.2.1.4 The detection method of the monitoring instrument shall be the root mean square detection method, and the reading of the monitoring instrument shall be the average value in any continuous 6 minutes.
4.2.2 Frequency-selective electromagnetic radiation monitor
The frequency-selective electromagnetic radiation monitor refers to the ability to receive and process the spectral components of a specific emission within the response frequency range of the instrument
The basic requirements for electrical performance of the field quantity monitoring instrument are shown in Table 1.
4.2.3 Non-selective frequency broadband electromagnetic radiation monitor
The non-selective broadband electromagnetic radiation monitor means that the monitoring value is the integrated value of the field strength of all frequency points within the frequency range of the instrument, and has various directions
The basic electrical performance requirements of the electromagnetic radiation monitor with the same sex response are shown in Table 2.
4.3 Monitoring conditions
The monitoring of the medium wave broadcasting transmitting station shall be carried out during the normal broadcasting period, covering the different working conditions of the transmitter corresponding to the antenna under test.
5 Monitoring method
5.1 Basic requirements
5.1.1 The monitoring range is the same as the electromagnetic radiation environmental impact assessment range in HJ 1112.
5.1.2 The location and frequency of monitoring shall be based on the representativeness of the monitoring data, the characteristics of environmental quality, changes and environmental impact assessment, and the environmental protection
The requirements for the inspection and acceptance are determined.
5.1.3 When monitoring the medium wave broadcasting transmitting station, the cross-sectional monitoring path should select the direction of the maximum radiation field strength of the tested antenna, and the maximum
Field strength. The direction of the maximum radiation field strength is given and located by the construction unit or antenna design unit.
5.2 Data collection
Before carrying out monitoring, the basic information of the tested medium wave broadcasting transmitting station should be collected, including. the name of the medium wave broadcasting transmitting station, construction location,
Radio frequency, transmit power, antenna type, operating status, etc.
According to the nature and purpose of monitoring, other information can also be collected, including. antenna distribution, transmitter operating arrangements and other parameters.
5.3 Monitoring factors
The electromagnetic radiation environment monitoring factor of the medium wave broadcasting transmitting station is the radio frequency electromagnetic field, and the monitoring parameters are the electric field intensity (or power density), magnetic
Field strength. In the far field area, you can monitor only the electric field strength (or power density); in the near field area, you need to monitor the electric field strength and magnetic field strength at the same time.
See HJ 1112 for the division of far and near fields.
5.4 Monitoring points
According to the regulations of HJ 1112.
5.4.1 Environmentally sensitive targets of electromagnetic radiation
When monitoring outside the building, the point should be placed in the public’s daily life or work closest to the antenna.
It can be reached by using tools (such as ladders) or by special means (such as climbing).
When monitoring in a building, the point is preferentially placed at the window (balcony) facing the antenna, and the probe (antenna) should be placed in the window frame (yang).
You can also select the center of the room within the interface. The distance between the probe (antenna) and household appliances and other equipment is not less than 1m.
When the electromagnetic radiation environment sensitive target is a multi-storey building, the setting of monitoring points should consider the distribution of electromagnetic fields on different floors.
5.4.2 The maximum field strength profile of the medium wave transmitting station antenna
The omnidirectional antenna cross-section monitoring path should be selected from the antenna ground projection point as the starting point and along the maximum radiation direction of the antenna lobe.
The distance is generally 10m, and the distance can also be set according to the site conditions, and generally monitor to the evaluation range. When the evaluation range is greater than 500m,
The spacing can be increased appropriately. Multiple antennas should comprehensively consider their electromagnetic radiation environmental impact.
The directional antenna cross-section monitoring path should be selected from the geometric center point of the antenna ground projection as the starting point, along the maximum radiation direction of the antenna lobe,
The interval between the monitoring points is generally 10m, and the interval can also be set according to the site conditions, and generally monitor to the evaluation range. When the evaluation range is greater than 500m
When, the spacing can be increased appropriately. Multiple antennas should comprehensively consider their electromagnetic radiation environmental impact.
The monitoring points should be flat and open, and avoid buildings, trees, power transmission lines, etc.
5.5 Monitoring height
The probe (antenna) of the monitoring instrument is 1.7m away from the ground (or standing plane).
5.6 Monitoring readings
During monitoring, the distance between the tip of the instrument probe (antenna) and the operator’s torso should not be less than 2m, and avoid or minimize the surrounding incidents.
Interference from other sources of electromagnetic radiation.
The monitoring time of each monitoring point is not less than 6 minutes, the data collection sampling rate is not less than 1 time/second, and the monitoring instrument is read continuously for 6 minutes
The clock monitors the average value.
5.7 Record
5.7.1 Record of Medium Wave Broadcasting Transmitting Station Information
Record the basic information and other information collected in Section 5.2.
5.7.2 Records of monitoring conditions
Record the ambient temperature, relative humidity, and weather conditions.
Record the monitoring date, monitoring start and end time, monitoring personnel, monitoring instrument model and number, and probe (antenna) model and number.
5.7.3 Records of monitoring results
Record the schematic diagram of the site monitoring points, and mark the locations of the medium wave antennas, monitoring points, and other known sources of electromagnetic radiation.
Record the name of the monitoring point, the horizontal distance between the monitoring point and the medium wave antenna, and the monitoring data.
During frequency selection monitoring, save the spectrum distribution map.
Refer to Appendix A for the content and format of site monitoring records and monitoring reports.
5.8 Field volume conversion
In the far field region, the electric field intensity and power density can be converted according to formula (1).
6 Quality Assurance
The monitoring agency shall have the capabilities and conditions suitable for the electromagnetic radiation environment monitoring business it is engaged in.
The selection of monitoring points should be representative and meet the requirements of Section 5.4.
Monitoring instruments (including antennas or probes) should be periodically verified or calibrated and used within the validity period of their certificate.
The instrument should be checked before and after each monitoring to ensure that the instrument is in normal working condition.
The monitoring personnel shall receive professional training, and the on-site monitoring work shall be carried out by no less than 2 monitoring personnel.
Interference factors should be excluded during monitoring, including man-made interference factors and environmental interference factors.
The selection of abnormal data in monitoring and the data processing of monitoring results should be handled in accordance with statistical principles.
Any archived or reported monitoring results should be reviewed.
A complete file of monitoring documents should be established.
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