GB 15540-1995 Technical requirements and measurement methods for electromagnetic compatibility of land mobile communications equipment
Some standard content:
National Standard of the People's Republic of China
Electromagnetic compatibility of land mobile communication equipment
Technical requirements and measurement methods
EMC specification and test methods for landmobile communication equipment Chapter 1 General Provisions
1 Subject content and scope of application
GB15540-1995
This standard specifies the requirements, limit values ??and measurement methods for conducted emission, conducted sensitivity, radiated emission, and radiation sensitivity of land mobile communication equipment.
This standard is applicable to equipment used in land mobile communication services, operating frequency is 25~1000MHz, and transmission power does not exceed 150W. 1.6~30MHz single sideband radio stations can also refer to the implementation. 2 Reference standards
GJB72 Electromagnetic interference and electromagnetic compatibility terminology GJB 151
Electromagnetic emission and sensitivity requirements for military equipment and subsystems GJB152 Electromagnetic emission and sensitivity measurement for military equipment and subsystems GB628025~1000MHz Capacity series and channel configuration of land mobile communications GB12192 Mobile communications FM radio transmitter measurement method GB12193 Mobile communications FM radio receiver measurement method 3 terms and symbols
3.1 terminology
3.1.1 conducted emission conducted emission Electromagnetic emissions that travel along conductors such as power lines or interconnect wires. 3.1.2 Radiated emission radiated emission is electromagnetic emission coupled to sensitive devices by means of radiation (including induction). 3.1.3 Radiated susceptibility refers to the degree of equipment or system performance degradation in the presence of radiation interference. High radiation sensitivity means low resistance to radiation interference. 3.1.4 Conducted susceptibility: In the presence of conducted interference, the degree of equipment or system performance degradation. High conductive sensitivity means low anti-conducted interference capability. 3. 1.5 Broadband emission - An emission whose energy spectrum distribution is quite wide, that is, its bandwidth is larger than the bandwidth of the measuring receiver. Its spectrum energy distribution is uniform and continuous enough that the measuring receiver is tuned within a range of several times the bandwidth. There is no significant change in their responses. 3.1.6 Narrowband emission - An emission whose energy spectrum distribution is relatively narrow, that is, its bandwidth is smaller than the bandwidth of the measuring receiver. It includes harmonic and non-harmonic emissions and parasitic emissions as approved by the State Administration of Technical Supervision on 1995-04-06 and implemented on 1995-12-01
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GB 15540—-1995
, which is usually characterized by a signal with a significant component at discrete frequencies or within a narrow frequency band. Note: The identification method of broadband emission and narrowband emission: a. The electromagnetic interference measuring instrument is tuned within the range of the center frequency plus or minus 2 times the pulse bandwidth. If the peak response change is less than 3dB, it is broadband emission; if the peak response change is greater than 3dB , then it is narrowband emission; b. Measure the pulse repetition frequency of the emission. If the pulse repetition frequency is less than or equal to the pulse bandwidth of the measuring device, it is a broadband emission. If the pulse repetition frequency is greater than the pulse bandwidth, it is narrowband emission. 3.1.7 Interconnecting lines are control lines and signal lines that connect to other equipment or subsystems. 3.1.8 Standard reference output: The output level that a device has when operating normally. The standard reference output is specified by the manufacturer in the equipment technical requirements. 3.1.9 Intermodulation
Two or more radio frequency interference signals with a certain frequency relationship generate new combined signals through nonlinear circuits to interfere with useful signals. | |tt | 3.2 The symbol
is represented by a combination of English letters and numbers: C conduction
R radiation
E emission
S sensitivity
CE conducted emission| |tt||RE radiated emission
CS conducted sensitivity
RS radiation sensitivity
Second Technical Requirements
4 Conducted Emission (CE)||tt| |4.125Hz~15kHz conducted emissions from power lines and interconnection lines (CE01) 4.1.1 Scope of application
This requirement applies to the narrowband emissions of the following types of connection lines in the 25Hz15kHz frequency band: AC and DC power lines, ground Line or internal ungrounded neutral line or control line.
4.1.2 Limit values ??
The electromagnetic emissions of AC and DC power lines and interconnection lines do not exceed the limit values ??specified in Figure 1. The bandwidth used by the measuring instrument is no greater than 75Hz. 101
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Figure 1 CEO1 narrowband emission limit
4.20.015~~50MHz conducted emission of power lines and interconnection lines (CE03) 4.2.1 Scope of application
This requirement applies to AC and DC power lines and interconnection lines . tfi
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4.2.2 Limit values
The narrowband and wideband levels on AC and DC power lines and interconnection lines shall comply with The values ??shown in Figure 2a and Figure 2b are 34.567891
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4.3.1 Scope of application
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This requirement applies to equipment with antenna connections and Subsystems and design requirements for equipment and subsystems connected to the antenna. The frequency range of this requirement is determined by the working frequency of the sample.
The provisions on the harmonic and spurious emission levels of the transmitter (working state) in this requirement do not apply to specimens where the transmitter has a non-detachable antenna and cannot be replaced by an appropriate dummy load, nor does it apply to It is suitable for frequencies within the required bandwidth of the sample and frequencies within the range of 55% of the fundamental frequency.
4.3.2 Limit values
The conducted emission level at the antenna end of the sample does not exceed the following requirements. 4.3.2.1 Receiver
narrowband emission level
a.
b． Broadband emission level
4.3.2.2 Transmitter (hot standby state)
a. Narrowband emission level
b. Broadband emission level
34 dBμV (500)
40 dBμV/MHz (50Q)
34 dBμV (500)
40 dBμV/MHz (502)|| tt||4.3.2.3 Transmitter (working state)
When the transmitter carrier power is less than or equal to 25W, the spurious radiation power of any discrete frequency does not exceed 2.5μW, when the transmitter carrier power is greater than 25W, the spurious emission power should be 70dB lower than the fundamental power. The suppression value for the second and third harmonics is; 50+10lgP, dB) (P. is the peak power of the fundamental wave, W). The average power of any emission is attenuated to at least a value below the average power of the transmitter. At any frequency that deviates from the assigned frequency by greater than 25% but not more than 100% of the permitted bandwidth, at least 25dB; a.
At any frequency that deviates from the assigned frequency by greater than 100% of the permitted bandwidth but not greater than 250% frequency, at least 35dB attenuation; b.
At any frequency that deviates from the assigned frequency greater than 250% of the permitted bandwidth, at least 50+10lgP (P is the average output power c
106|| tt||rate, W)dB.
5 Conduction sensitivity (CS)
GB 15540—1995
5.125Hz～50kHz power line conduction sensitivity (CS01) 5.1.1 Scope of application
This requirement Applicable to power cords of equipment and subsystems, including equipment and subsystem ground wires and internal ungrounded neutral wires and neutral wires. This requirement does not apply to frequencies within ±5% of the power supply frequency. 5.1.2 Limit value
When the power line of the sample is injected with electromagnetic energy equal to or less than the value shown in Figure 3, the sample should not experience any failure, performance degradation or exceed the specifications of individual equipment and subsystems. The index tolerance specified in . 567891
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5.2 power supply Line and interconnect conduction sensitivity (CS02) 5.2.1 Scope of application
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This requirement applies to the power cords of equipment and subsystems, including ground wires and ungrounded neutral wires within the equipment or subsystems. 5.2.2 Limit values
When subjected to a 1V signal output by a signal source with an output impedance of 50α and a frequency of 0.05 to 400MHz, no failure, performance degradation, or indication deviation exceeds the allowable value given in the equipment or subsystem specification. When the internal resistance is When the 1W signal source with 502 impedance cannot produce the required voltage at the sample power input end, and the sample is not sensitive to the signal source output, this requirement is also considered to be met
5.3 intermodulation conduction sensitivity (CS03).
5.3.1 Scope of application
This requirement applies to receivers, radio frequency amplifiers, transceivers and similar receiving equipment and subsystems. The applicable frequency range of this requirement depends on the operating frequency of the sample. .
5.3.2 limit value
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Channel spacing
25kHz channel spacing
12.5kHz channel spacing|| tt||5.4 Suppression of unwanted signals (CS04)
5.4.1 Scope of application
Base station
≥65
≥60
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Fixed platform, turning platform
≥60
55
Portable platform
W55
≥50
dB| |tt||This requirement applies to receivers, radio frequency amplifiers, transceivers and similar receiving equipment and subsystems. The applicable frequency range of this requirement depends on the operating frequency of the sample
5.4.2 Limits.
dB
Radio type
Channel spacing
25 kHz channel spacing
12.5kHz channel spacing
5.5 intermodulation conduction sensitivity ( CS05)
Base station
≥70
≥65
Fixed platform, mobile platform
≥65
≥60||tt ||Portable station
55
≥50
5.5.1CS05 Scope
This requirement applies to receivers, radio frequency amplifiers, transceivers and similar receiving equipment and subsystem, the frequency range depends on the working frequency of the sample
5.5.2CS05 limit value
When the sample is affected by the signal of signal generator 2 shown in 10.5 Measurement Methods, it should not be used. Any failure, performance degradation, or indication deviation due to intermodulation that exceeds the allowable value given by the equipment or subsystem specification. The signal level generated by signal generator 2 is 66dB higher than the required level of the standard reference output, but not more than 10dBm. 5.6 Conduction sensitivity of power line spike signals (CS06) 5.6.1 Scope of application
This requirement applies to power lines of equipment and subsystems, including neutral lines connected to equipment and subsystems that are not grounded internally and neutral line 5.6.2 limit value
When the peak signal of the waveform shown in Figure 4 is sequentially added to the AC and DC power lines of the sample, the sample should not have any failure, performance degradation or exceed the performance of a single device and According to the index tolerance specified in the system specifications, the time for adding a test signal to each phase power line shall not be less than 1 minute, and the total duration shall not exceed 15 minutes. The spike signal should be superimposed on the voltage waveform of the power supply, E=100V, t=10μs±20%. 108
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5.7 Squelch circuit conduction sensitivity (CS07) GB 15540-1995
Waveform of Figure 4 CS06
5.7. 1 Scope of application
This requirement applies to receiving equipment and subsystems using squelch circuits. Time
5.7.2 Limit value
a. Requirement 1: When the output of the 50m impedance pulse generator is placed at 90dBμV/MHz and matched to the sample input terminal, the squelch circuit should not be opened;
b. Requirement 2: When two signals are applied to the sample input terminal, the squelch circuit should not be opened. Signal 1 is an unmodulated RF signal, its frequency is the tuning frequency of the receiver, and its amplitude should be 2/3 of the RF voltage value used to adjust the squelch threshold. The second signal should be a pulse signal of 50dBμV/MHz.
6 Radiated Emission (RE)
6.1 Electric Field Radiated Emission (RE02)
6.1.1 Scope of application
This requirement applies to equipment and subsystems, cables (including Radiated emissions from control, pulse, IF, power, etc. cables and antenna feeders) and specimen interconnections. The frequency range applies to broadband emissions and narrowband emissions from 25MHz to 1GHz. For narrowband fields, it applies to the fundamental frequency and all spurious emissions including harmonics, but does not apply to antenna radiation. 6.1.2 Limit values ??
At the specified distance, the narrow-band electric field emission level should not exceed the limit value in Figure 5, and the broadband electric field emission (including switching transient emission) level should not exceed the limit value in Figure 6 . When exceeding 30MHz, both horizontal and vertical polarized waves should meet this requirement. 109
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6.2 Radiated emission of spurious signals ( RE03) GB15540-1995
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Figure 6RE02 broadband emission limit
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Rate, MHz| | tt | Instead, the frequency range depends on the operating frequency of the specimen. This requirement does not apply to frequencies within the required bandwidth of the specimen, nor to frequencies within ±5% of the fundamental frequency. 6.2.2 Limit value
According to the provisions of Article 6 of GB6280.
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7 Radiation sensitivity (RS)
7.1 Electric field radiation sensitivity (RS03)
7.1.1 Scope of application
GB 15540— 1995
This requirement applies to all equipment and subsystems within the mobile communications frequency range 7.1.2 Limit value
When the sample is subjected to electric field radiation of less than 5V/m, there should not be any permanent failure, performance degradation, or indication deviation exceeding the allowable value given in the single equipment or subsystem specification. Above 25MHz, both horizontal and vertical polarization should meet the requirements. Part Three Measurement Methods
8 Requirements
8.1 The general requirements for electromagnetic emission and electromagnetic sensitivity measurement methods comply with the provisions of GJB151 and GJB152. 8.2 Test conditions
8.2.1 Environmental electromagnetic level
The environmental level measured when the sample is powered off should be 6dB lower than the allowable limit value of the item to be tested. These requirements apply to both Environmental levels due to radiation also apply to environmental levels due to conduction. 8.2.2 The ground plate
should be a solid ground plate made of copper or brass. The area of ??the ground plate should be greater than or equal to 2.25m2 and the minimum side length should be greater than 76cm. The minimum thickness should be 0.25mm (copper plate) or 0.63 mm (brass plate), the grounding plate should be connected to the shielded room, the DC connection resistance should not be greater than 2.5m, and the distance between joints should not be greater than 90cm. 8.2.3 Personnel and equipment
The shielded room should not contain irrelevant equipment, cable racks and tables. Only equipment essential for testing should be placed. Staff who are not participating in the test should not enter the shielded room.
8.2.4 Radio frequency absorbing materials
When conducting electromagnetic interference tests, in order to reduce the reflection from the surface of the shielded room to the measurement antenna, radio frequency absorbing materials can be used according to the orderer's requirements. It can also be done in an anechoic chamber.
8.3 Measuring equipment
The measuring equipment used should meet the technical requirements of Part 2 of this standard, and all measuring equipment should be calibrated according to the requirements specified by the instrument. 8.3.1 Detector
Peak detectors are used for all measurements, but average detectors can be used for narrowband measurements. 8.3.2 Grounding of measuring equipment
a. The antenna should be kept away from the measuring instrument,
b. The electromagnetic interference measuring instrument should be truly grounded at one point: the electromagnetic interference measuring instrument should be connected to the AC power supply via an isolation transformer, and the grounding of the power supply on the chassis must be disconnected at this point to avoid RF ground current is flowing in the test equipment. 8.3.3 Pulse generator
The pulse generator shall be calibrated as follows:
a Add the output signal of the pulse generator to the input of an amplitude-linear receiver with a synchronously tuned subcritical coupling circuit end. The electromagnetic interference measuring instrument can meet the above requirements as long as its pulse width is greater than five times the pulse generator repetition frequency and disables any automatic gain control (AGC) system in the instrument. For this purpose, a low voltage signal with an appropriate level is used. The impedance power supply stably grounds the AGC line; b. At the IF output end, obtain the oscilloscope graph of the entire frequency response of the receiver, adjust the control knob of the oscilloscope so that the graph within the measurement area on the screen is as large as possible, take a photo or draw the graph. Record the scanning speed set on the oscilloscope (the scanning speed should be accurately calibrated); c. Use a integrator or other integrating device to determine the area of ??the figure. Repeat at least ten times, and take the average value as the area value; 111
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