CN115932690A - Device and method for real-time verification of radiation disturbance measurement system - Google Patents
Device and method for real-time verification of radiation disturbance measurement system Download PDFInfo
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- CN115932690A CN115932690A CN202211474178.0A CN202211474178A CN115932690A CN 115932690 A CN115932690 A CN 115932690A CN 202211474178 A CN202211474178 A CN 202211474178A CN 115932690 A CN115932690 A CN 115932690A
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Abstract
The invention provides a device for real-time verification of a radiation disturbance measurement system, which is characterized by comprising a signal generating unit; a programmable attenuator; a radio frequency amplifier; a transmitting antenna; a microcontroller; a power supply unit. The invention further provides a method for verifying the radiation disturbance measurement system in real time. Aiming at the problems that the current radiation disturbance measurement system has the risk of measurement data error, the verification in the system period takes long time and the like, the invention can realize the real-time verification of the radiation disturbance measurement system in the measurement process, simultaneously avoid the electromagnetic wave reflection of the device per se and the reference signal used for the real-time verification of the radiation disturbance measurement system from interfering the measurement data of the tested equipment, and ensure the accuracy and reliability of the measurement data.
Description
Technical Field
The invention relates to a device and a method for real-time verification of a radiation disturbance measurement system, and belongs to the technical field of electromagnetic compatibility tests.
Background
Radiation disturbance measurement is used as an important test item in an electromagnetic compatibility (EMC) test and mainly measures electromagnetic disturbance energy transmitted by a device under test (EUT) and propagated through space. At present, in order to verify whether a radiation disturbance measurement system is in a normal state, period check is required to be carried out on the system, namely a comb signal source is used as a standard reference source and placed in an EUT area, radiation disturbance measurement is carried out, and then whether the radiation disturbance measurement system meets requirements or not is judged by comparing whether measured data of previous times are within a range or not. The period check of the radiation disturbance measurement system is usually performed once a day or a week, and each time requires about 1 hour.
In the radiation disturbance measurement, different types of measurement receiving antennas need to be exchanged aiming at different frequency bands, but a large amount of time cannot be consumed for carrying out period check on a measurement system after the measurement receiving antennas are exchanged, so that a greater risk of measurement data accuracy is caused if the measurement system has errors such as poor contact of a radio frequency channel interface, error in channel selection, damage of a radio frequency cable and the like. In particular, in the measurement of the 1 m method semi-anechoic chamber method adopted by automobile parts, military and aerospace products, four measurement antennas are needed to be used, which are respectively: 1) monopole antenna is adopted at 150 kHz-30 MHz, 2) biconical antenna is adopted at 30 MHz-300 MHz, 3) log periodic antenna is adopted at 300 MHz-1 GHz, and 4) horn antenna is adopted above 1 GHz. At the same time, the measurement time for a single frequency band is short (about 15 minutes). Therefore, several tens of times (20 to 40 times) of switching the measurement receiving antenna or channel is required for continuous measurement per day, which significantly increases the occurrence probability of errors in the measurement system, and poses a serious threat to the accuracy of measurement data.
Disclosure of Invention
The purpose of the invention is: the real-time verification of the radiation disturbance measurement system in the measurement process is realized, meanwhile, the electromagnetic wave reflection of the device and the interference of the reference signal for the real-time verification of the radiation disturbance measurement system on the EUT measurement data are avoided, and the accuracy and reliability of the measurement data are ensured.
In order to achieve the above object, one aspect of the present invention provides an apparatus for real-time verification of a radiation disturbance measurement system, including:
the signal generation unit is used for generating radio frequency signals of a plurality of frequency points in a radiation disturbance measurement frequency band;
the input port of the programmable attenuator is connected to the output port of the signal generating unit and is used for adjusting the amplitude of the radio-frequency signal generated by the signal generating unit;
the input port of the radio frequency amplifier is connected to the output port of the programmable attenuator and is used for linearly amplifying the radio frequency signal of which the amplitude is adjusted by the programmable attenuator;
the input port of the transmitting antenna is connected to the output port of the radio frequency amplifier and is used for carrying out space radiation emission on the radio frequency signal which is linearly amplified by the radio frequency amplifier;
the microcontroller is connected to the signal generation unit and the programmable attenuator and is used for controlling the frequency point frequency value and the frequency point number of the radio-frequency signal generated by the signal generation unit and controlling the programmable attenuator to adjust the amplitude value of the radio-frequency signal to a required value;
and the power supply unit is connected to the signal generation unit, the program-controlled attenuator, the radio frequency amplifier and the microcontroller and is used for supplying power to the signal generation unit, the program-controlled attenuator, the radio frequency amplifier and the microcontroller after regulating and stabilizing the voltage of an external power supply.
Preferably, the signal generating unit generates a radio frequency signal of a frequency point on each frequency band of the four frequency bands of 150kHz to 30MHz, 30MHz to 300MHz, 300MHz to 1GHz and 1GHz to 6GHz, and is used for respectively performing system verification on the states of the four measuring antennas corresponding to the four frequency bands;
four radio frequency signals on four frequency bands of 150 kHz-30 MHz, 30 MHz-300 MHz, 300 MHz-1 GHz and 1 GHz-6 GHz are used as reference signals and exist simultaneously in response time of a radiation disturbance measurement system, so that the corresponding reference signals can be identified for measurement of any frequency band, and convenience and stability of operation are improved.
Preferably, for a single or other number of measurement environments except the four frequency bands of 150kHz to 30MHz, 30MHz to 300MHz, 300MHz to 1GHz, and 1GHz to 6GHz, the signal generation unit may generate only radio frequency signals of one or other number of frequency points in the current frequency band, and the frequency point number selection principle is to ensure that each measurement antenna can recognize one reference signal for the state verification of the radiation disturbance measurement system.
Preferably, the programmable attenuator is adjusted to enable the amplitude value of the radio frequency signal received by the radiation disturbance measuring antenna to be at least 3dB higher than the environmental noise on the frequency point where the radio frequency signal is located and at least 6dB lower than the standard limit value;
the frequency point selection principle of the reference signal on the frequency band corresponding to each measuring antenna is selected in the area with the maximum difference between the environmental noise and the standard limit value.
Preferably, the power supply unit includes:
a rechargeable battery for internal power supply of the device;
and the power supply switch is used for controlling the on or off state of the device.
Preferably, the signal generation unit, the program-controlled attenuator, the radio frequency amplifier, the microcontroller and the power supply unit are all PCB-level circuits composed of active radio frequency chips and components and are located in a device shell with good shielding performance, and the maximum side length of the device shell is not more than 10cm, so as to avoid electromagnetic wave reflection of the device itself from affecting radiation disturbance measurement data of the EUT.
Preferably, the device housing comprises an external power input interface, a communication interface and a radio frequency output interface;
the external power supply input interface is used for connecting an external power supply to the power supply unit;
the communication interface is connected to the microcontroller and used for writing a control instruction into the microcontroller, the communication connecting line can be disconnected after the control instruction is written into the microcontroller, and the microcontroller stores the control instruction and controls the signal generating unit and the program-controlled attenuator;
the radio frequency output interface is a coaxial radio frequency interface, the interior of the radio frequency output interface is connected to the output port of the radio frequency amplifier, the exterior of the radio frequency output interface is connected to the transmitting antenna, and the radio frequency output interface is used for transmitting radio frequency signals inside the device shell to the exterior and carrying out space radiation emission through the transmitting antenna.
The other technical scheme of the invention is to provide a method for real-time verification of a radiation disturbance measurement system, which applies the device for real-time verification of the radiation disturbance measurement system and comprises the following steps:
the device for real-time verification of the radiation disturbance measurement system is fixedly arranged at the corner inside the anechoic chamber so as to avoid the influence of electromagnetic wave reflection of the device on the radiation disturbance measurement data of the EUT;
the device for real-time verification of the radiation disturbance measurement system is in an open state and transmits a reference signal, a measurement receiver system outside the anechoic chamber measures environmental noise inside the anechoic chamber through a measurement antenna and generates a first group of test data, wherein the first group of test data comprises the environmental noise inside the anechoic chamber and the reference signal, and whether the radiation disturbance measurement system is in a normal state or not is judged by comparing whether the amplitude value of the reference signal is in a required range or not;
the device for real-time verification of the radiation disturbance measurement system is in a constant starting state, the EUT is started and is in a typical working state required by radiation disturbance measurement, the measurement receiver system outside the anechoic chamber measures radiation emission data of the EUT inside the anechoic chamber through the measurement antenna and generates a second group of test data, the second group of test data comprises the EUT measurement data inside the anechoic chamber and a reference signal, and whether the radiation disturbance measurement system is in a normal state or not is judged by comparing whether the amplitude value of the reference signal is in a required range or not.
Preferably, the installation position of the device for real-time verification of the radiation disturbance measurement system in the anechoic chamber is within the receiving lobe range of the radiation disturbance measurement antenna.
Preferably, a one-time whole-process site and system check is performed on the anechoic chamber, after the radiation disturbance measurement system is confirmed to be in a normal state, the amplitude values of a group of reference signals are measured by adopting the measurement antenna of each frequency band to serve as reference values, and a floating range is specified on the basis of the reference values according to laboratory requirements, for example, +/-2 dB of the reference values;
for a measuring antenna with a polarization direction, the amplitude values of the reference signal in different polarization conditions of horizontal polarization and vertical polarization should be distinguished.
Preferably, when the reference signal is drowned by the radiation emission signal of the EUT, the judgment result of the first group of test data is taken as the standard;
when the EUT owner thinks that the reference signal exists in the EUT measurement data, the device for real-time verification of the radiation disturbance measurement system can be closed, and the judgment result of the first group of test data is taken as the standard.
The beneficial technical effects of the invention are as follows: aiming at the problems that a current radiation disturbance measurement system has the risk of measuring data errors, the verification in the system period consumes long time and the like, a microcontroller is adopted to control a signal generation unit to output radio frequency reference signals of a plurality of frequency points, a program-controlled attenuator is controlled to adjust the amplitude of the reference signals, and the reference signals are linearly amplified by a radio frequency amplifier and then transmitted to a transmitting antenna for space radiation transmission; in the radiation disturbance measurement, each measuring antenna judges whether the radiation disturbance measuring system is in a normal state or not by identifying the reference signal and comparing the amplitude value of the reference signal, so that the radiation disturbance measuring system is verified in real time in the measuring process, meanwhile, the electromagnetic wave reflection of the device and the reference signal used for the real-time verification of the radiation disturbance measuring system are prevented from interfering the EUT measuring data, and the accuracy and reliability of the measuring data are ensured.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a real-time verification device for a radiation disturbance measurement system according to the present invention;
fig. 2 is an application example of the real-time verification device for the radiation disturbance measurement system of the invention.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
Referring to fig. 1, the device for real-time verification of a radiation disturbance measurement system disclosed in this embodiment includes a signal generation unit 1, a programmable attenuator 2, a radio frequency amplifier 3, a transmitting antenna 4, a microcontroller 5, and a power supply unit 6.
The signal generating unit 1 is a PCB (printed Circuit Board) circuit composed of an active radio frequency chip and components and used for generating radio frequency signals of multiple frequency points in a radiation disturbance measuring frequency band.
One preferred embodiment is: the signal generating unit 1 generates a radio frequency signal of a frequency point on each frequency band of the four frequency bands of 150 kHz-30 MHz, 30 MHz-300 MHz, 300 MHz-1 GHz and 1 GHz-6 GHz, and is used for respectively performing system verification on the states of four measuring antennas corresponding to the four frequency bands.
Another preferred embodiment is: four radio frequency signals on four frequency bands of 150 kHz-30 MHz, 30 MHz-300 MHz, 300 MHz-1 GHz and 1 GHz-6 GHz are used as reference signals and exist simultaneously in response time of a radiation disturbance measurement system, so that the corresponding reference signals can be identified for measurement of any frequency band, and convenience and stability of operation are improved.
Another preferred embodiment is: for a single or other number of frequency band measurement environments, the signal generation unit 1 may generate only one or other number of frequency point radio frequency signals in the frequency band, and the frequency point number selection principle is to ensure that each measurement antenna can recognize one reference signal for the measurement system status verification.
The input port of the programmable attenuator 2 is connected to the output port of the signal generating unit 1, and is used for adjusting the amplitude of the radio frequency signal generated by the signal generating unit 1.
One preferred embodiment is: and adjusting the programmable attenuator 2 to ensure that the amplitude value of the radio-frequency signal received by the radiation disturbance measuring antenna is at least 3dB higher than the environmental noise on the frequency point and at least 6dB lower than the standard limit value.
One preferred embodiment is: the frequency point selection principle of the reference signal on the frequency band corresponding to each measuring antenna is selected in the area with the maximum difference between the environmental noise and the standard limit value.
The input port of the radio frequency amplifier 3 is connected to the output port of the programmable attenuator 2, and is used for linearly amplifying the radio frequency signal whose amplitude is adjusted by the programmable attenuator 2.
The input port of the transmitting antenna 4 is connected to the output port of the radio frequency amplifier 3, and is used for performing spatial radiation transmission on the radio frequency signal linearly amplified by the radio frequency amplifier 3.
The microcontroller 5 is connected to the signal generating unit 1 and the programmable attenuator 2, and is configured to control the frequency point frequency value and the frequency point number of the radio frequency signal generated by the signal generating unit 1, and control the programmable attenuator 2 to adjust the amplitude value of the radio frequency signal to a desired value.
The power supply unit 6 is connected to the signal generation unit 1, the programmable attenuator 2, the radio frequency amplifier 3 and the microcontroller 5, and is used for supplying power to each internal module after regulating and stabilizing the voltage of an external power supply.
One preferred embodiment is: the power supply unit 6 contains a rechargeable battery for internal power supply of the device disclosed in this embodiment.
Another preferred embodiment is: the power supply unit 6 includes a power supply switch for controlling the on or off state of the device disclosed in this embodiment.
One preferred embodiment is: the device for real-time verification of the radiation disturbance measurement system comprises the signal generation unit 1, the program-controlled attenuator 2, the radio frequency amplifier 3, the microcontroller 5 and the power supply unit 6 which are all PCB (printed Circuit Board) circuit composed of active radio frequency chips and components and are located in a device shell with good shielding performance.
One preferred embodiment is: the maximum side length of the device shell is not more than 10cm, so that the influence of electromagnetic wave reflection of the device on radiation disturbance measurement data of the EUT is avoided.
A preferred embodiment is: the device casing includes external power source input interface, communication interface and radio frequency output interface, wherein:
the external power input interface is used for connecting an external power supply to the power supply unit 6;
the communication interface is connected to the microcontroller 5 and is used for writing a control instruction into the microcontroller 5, the communication connection line can be disconnected after the control instruction is written into the microcontroller 5, and the microcontroller 5 stores the control instruction and controls the signal generating unit 1 and the programmable attenuator 2;
the radio frequency output interface is a coaxial radio frequency interface, the inside of the radio frequency output interface is connected to the output port of the radio frequency amplifier 3, the outside of the radio frequency output interface is connected to the transmitting antenna 4, and the radio frequency output interface is used for transmitting radio frequency signals inside the device shell to the outside and carrying out space radiation emission through the transmitting antenna 4.
In an embodiment of the present invention, an application of the apparatus for real-time verification of a radiation disturbance measurement system, see fig. 2, includes an apparatus 11 for real-time verification of a radiation disturbance measurement system, a device under test (EUT), 12, a measurement antenna 13, a group of radio frequency coaxial cables 14, and a measurement receiver 15.
The device 11 for real-time verification of the radiation disturbance measurement system is fixedly installed at the corner inside the anechoic chamber, so as to avoid the influence of the electromagnetic wave reflection of the device on the radiation disturbance measurement data of the EUT 12.
One preferred embodiment is: the installation position of the device 11 for real-time verification of the radiation disturbance measurement system in the anechoic chamber is within the receiving lobe range of the measurement antenna 13.
The measuring antenna 13 is connected to a measuring receiver 15 outside the anechoic chamber by the radio frequency coaxial cable 14.
The device 11 for real-time verification of the radiation disturbance measurement system is in an open state and transmits a reference signal, and the measurement receiver 15 system outside the anechoic chamber measures environmental noise inside the anechoic chamber through the measurement antenna 13 and generates a first group of test data.
The first group of test data comprises environmental noise and a reference signal in an anechoic chamber, and whether the radiation disturbance measuring system is in a normal state or not is judged by comparing whether the amplitude value of the reference signal is in a required range or not.
A preferred embodiment is: and performing site and system check of a whole process on the anechoic chamber once, after confirming that the radiation disturbance measurement system is in a normal state, measuring amplitude values of a group of reference signals by adopting the measurement antenna of each frequency band as reference values, and regulating a floating range, such as +/-2 dB of the reference values, according to laboratory requirements on the basis of the reference values.
One preferred embodiment is: for a measuring antenna with a polarization direction, the amplitude values of the reference signal in different polarization conditions of horizontal polarization and vertical polarization should be distinguished.
The device 11 for real-time verification of the radiation disturbance measurement system is in a constant opening state, the EUT 12 is opened and is in a typical working state required by radiation disturbance measurement, and the measurement receiver 15 system outside the anechoic chamber measures radiation emission data of the EUT 12 inside the anechoic chamber through the measurement antenna 13 and generates a second group of test data.
The second set of test data contains the measurement data of the EUT 12 inside the anechoic chamber and the reference signal, and whether the radiation disturbance measurement system is in a normal state is judged by comparing whether the amplitude value of the reference signal is in a required range.
One preferred embodiment is: and when the reference signal is drowned by the radiation emission signal of the EUT 12, the judgment result of the first group of test data is taken as the standard.
A preferred embodiment is: when the owner of the EUT 12 thinks that the reference signal exists in the EUT measurement data, the device 11 for real-time verification of the radiation disturbance measurement system may be turned off, and at this time, the determination result of the first set of test data is used as the criterion.
Claims (10)
1. An apparatus for real-time verification of a radiation disturbance measurement system, comprising:
the signal generation unit is used for generating radio frequency signals of a plurality of frequency points in a radiation disturbance measurement frequency band;
the input port of the programmable attenuator is connected to the output port of the signal generating unit and is used for adjusting the amplitude of the radio-frequency signal generated by the signal generating unit;
the input port of the radio frequency amplifier is connected to the output port of the programmable attenuator and is used for linearly amplifying the radio frequency signal of which the amplitude is adjusted by the programmable attenuator;
the input port of the transmitting antenna is connected to the output port of the radio frequency amplifier and is used for carrying out space radiation emission on the radio frequency signal which is linearly amplified by the radio frequency amplifier;
the microcontroller is connected to the signal generating unit and the program-controlled attenuator and is used for controlling the frequency point frequency value and the frequency point number of the radio-frequency signal generated by the signal generating unit and controlling the program-controlled attenuator to adjust the amplitude value of the radio-frequency signal to a required value;
and the power supply unit is connected to the signal generation unit, the programmable attenuator, the radio frequency amplifier and the microcontroller and is used for supplying power to the signal generation unit, the programmable attenuator, the radio frequency amplifier and the microcontroller after regulating and stabilizing the voltage of an external power supply.
2. The device for the real-time verification of the radiation disturbance measurement system according to claim 1, wherein the signal generating unit generates a radio frequency signal of a frequency point on each of four frequency bands of 150kHz to 30MHz, 30MHz to 300MHz, 300MHz to 1GHz, and 1GHz to 6GHz, and is used for respectively performing system verification on four measurement antenna states corresponding to the four frequency bands;
four radio frequency signals on four frequency bands of 150 kHz-30 MHz, 30 MHz-300 MHz, 300 MHz-1 GHz and 1 GHz-6 GHz are used as reference signals and exist simultaneously in response time of a radiation disturbance measurement system, so that the corresponding reference signals can be identified for measurement of any frequency band, and convenience and stability of operation are improved.
3. The device for the real-time verification of the radiation disturbance measurement system according to claim 2, wherein aiming at a single measurement environment or measurement environments of other number of frequency bands except the four frequency bands of 150 kHz-30 MHz, 30 MHz-300 MHz, 300 MHz-1 GHz and 1 GHz-6 GHz, the signal generation unit can only generate radio frequency signals of one or other number of frequency points in the current frequency band, and the frequency point number selection principle is to ensure that each measurement antenna can recognize a reference signal for the state verification of the radiation disturbance measurement system.
4. The device for real-time verification of the radiation disturbance measurement system according to claim 1, wherein the programmable attenuator is adjusted to enable the amplitude value of the radio frequency signal received by the radiation disturbance measurement antenna to be at least 3dB higher than the environmental noise on the frequency point and at least 6dB lower than the standard limit value;
the frequency point selection principle of the reference signal on the frequency band corresponding to each measuring antenna is selected in the area with the maximum difference between the environmental noise and the standard limit value.
5. The device for real-time verification of the radiation disturbance measurement system according to claim 1, wherein the signal generation unit, the programmable attenuator, the radio frequency amplifier, the microcontroller and the power supply unit are all PCB-level circuits composed of active radio frequency chips and components and are located in a device shell with good shielding performance, and the maximum side length of the device shell is not more than 10cm.
6. The device for real-time verification of a radiation disturbance measurement system according to claim 5, wherein the device housing comprises an external power input interface, a communication interface and a radio frequency output interface, wherein: the external power supply input interface is used for connecting an external power supply to the power supply unit;
the communication interface is connected to the microcontroller and used for writing a control instruction into the microcontroller, the communication connecting line can be disconnected after the control instruction is written into the microcontroller, and the microcontroller stores the control instruction and controls the signal generating unit and the program-controlled attenuator;
the radio frequency output interface is a coaxial radio frequency interface, the interior of the radio frequency output interface is connected to the output port of the radio frequency amplifier, the exterior of the radio frequency output interface is connected to the transmitting antenna, and the radio frequency output interface is used for transmitting radio frequency signals inside the device shell to the exterior and carrying out space radiation emission through the transmitting antenna.
7. A method for real-time verification of a radiation disturbance measurement system, which applies the device for real-time verification of the radiation disturbance measurement system in claim 1, and is characterized by comprising the following steps:
fixedly installing the device for real-time verification of the radiation disturbance measurement system as claimed in claim 1 at the corner inside an anechoic chamber to avoid electromagnetic wave reflection of the device per se from influencing radiation disturbance measurement data of EUT;
the device for real-time verification of a radiation disturbance measurement system as claimed in claim 1, being in an on state and emitting a reference signal, the measurement receiver system outside the anechoic chamber measuring the environmental noise inside the anechoic chamber through the measurement antenna and generating a first set of test data, wherein the first set of test data comprises the environmental noise inside the anechoic chamber and the reference signal, and determining whether the radiation disturbance measurement system is in a normal state by comparing whether the amplitude value of the reference signal is within a required range;
the apparatus for real-time verification of a radiation disturbance measuring system as claimed in claim 1, wherein the apparatus is turned on with the EUT on and in a typical operating state required for radiation disturbance measurement, the measurement receiver system outside the anechoic chamber measures radiation emission data of the EUT inside the anechoic chamber through the measurement antenna and generates a second set of test data, wherein the second set of test data comprises the EUT measurement data inside the anechoic chamber and the reference signal, and whether the radiation disturbance measuring system is in a normal state is determined by comparing whether the amplitude value of the reference signal is within a required range.
8. The method for real-time verification of the radiation disturbance measurement system according to claim 7, wherein the device for real-time verification of the radiation disturbance measurement system is installed in the anechoic chamber at a position within a receiving lobe of the radiation disturbance measurement antenna.
9. The method for real-time verification of the radiation disturbance measurement system according to claim 7, characterized in that a full-flow field and system check is performed on an anechoic chamber, after the radiation disturbance measurement system is confirmed to be in a normal state, amplitude values of a group of reference signals are measured by adopting measurement antennas of each frequency band to serve as reference values, and a floating range is specified according to laboratory requirements on the basis of the reference values;
for a measuring antenna with a polarization direction, the amplitude values of the reference signal in different polarization conditions of horizontal polarization and vertical polarization should be distinguished.
10. The method for real-time verification of the radiation disturbance measurement system according to claim 7, characterized by comprising the following steps:
when the reference signal is submerged by the radiation emission signal of the EUT, the judgment result of the first group of test data is taken as the standard;
when the EUT owner thinks that the reference signal exists in the EUT measurement data, the device for real-time verification of the radiation disturbance measurement system can be closed, and the judgment result of the first group of test data is used as the standard.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116500368A (en) * | 2023-06-27 | 2023-07-28 | 中汽研新能源汽车检验中心(天津)有限公司 | System for evaluating consistency of radiation emission tests among laboratories and testing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116500368A (en) * | 2023-06-27 | 2023-07-28 | 中汽研新能源汽车检验中心(天津)有限公司 | System for evaluating consistency of radiation emission tests among laboratories and testing method thereof |
| CN116500368B (en) * | 2023-06-27 | 2023-09-15 | 中汽研新能源汽车检验中心(天津)有限公司 | System for evaluating consistency of radiation emission tests among laboratories and testing method thereof |
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