CN215953739U - Accuracy checking device for current method conducted disturbance measuring system - Google Patents
Accuracy checking device for current method conducted disturbance measuring system Download PDFInfo
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- CN215953739U CN215953739U CN202121737659.7U CN202121737659U CN215953739U CN 215953739 U CN215953739 U CN 215953739U CN 202121737659 U CN202121737659 U CN 202121737659U CN 215953739 U CN215953739 U CN 215953739U
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Abstract
The utility model discloses an accuracy checking device for a current method conducted disturbance measuring system, which is characterized in that: the coaxial radio frequency load comprises a trapezoidal pulse generation module, a first coaxial radio frequency connector, a second coaxial radio frequency connector, a first transmission conductor, a second transmission conductor, a coaxial radio frequency load and an insulating support gasket. The utility model outputs the trapezoidal pulse with the repetition period less than the minimum measurement residence time of the current method conduction disturbance measurement system and the repetition frequency less than the minimum measurement medium frequency bandwidth of the current method conduction disturbance measurement system through the trapezoidal pulse generation module, and transmits the trapezoidal pulse to two transmission conductors and a coaxial radio frequency load through the coaxial radio frequency cable and the coaxial radio frequency connector to form a fixed structure transmission line in a hard connection manner, and finally a current ring clamped on the transmission conductors can measure a radio frequency current spectrum with flat and continuous full-band amplitude, and is compared with a theoretical calculated value, so that full-band and rapid accuracy check of the current method conduction disturbance measurement system is realized.
Description
Technical Field
The utility model relates to an accuracy checking device for a current method conducted disturbance measuring system, and belongs to the technical field of electromagnetic compatibility tests.
Background
The purpose of an electromagnetic compatibility test is to assess the ability of a system, device to work in coordination with an external system, device, or electromagnetic environment without interfering with each other. The current method conducted disturbance measurement test is one of key items in an electromagnetic compatibility test, and is clamped on a wiring harness of a Device Under Test (DUT) through a current loop to electromagnetically induce the electromagnetic disturbance signal level of the wiring harness of the DUT to the outside.
According to the relevant requirements of the national standard GB/T18655 (corresponding to the international standard CISPR 25), the frequency range of the current method conducted disturbance measurement is 150 kHz-108 MHz, and the frequency range contains abundant interference signals such as broadcasting signals, television signals and the like. A current loop in the current method conducted disturbance measurement system measures an electromagnetic disturbance signal of a DUT wire harness to the outside through space electromagnetic induction, and the DUT wire harness is very easily influenced by the disturbance signal. Therefore, in the current method conducted disturbance measurement test, measurement parts such as a DUT system and a current loop need to be arranged in an electromagnetic shielding room or a dark room, and data reading parts such as a receiver and a control computer are usually arranged outside the electromagnetic shielding room or the dark room; the measurement part and the data reading part are connected through a coaxial radio frequency cable and at least one radio frequency interface board, so that the complexity of the conduction disturbance measurement system by the current method is caused. In the current method conducted disturbance measurement system, factors such as the radio frequency performance reduction of any interface or coaxial radio frequency cable, the radio frequency characteristic change of a current loop, the gain change of a fragile preamplifier and the like all influence the accuracy of measured data. Therefore, the periodical accuracy check of the current method conducted disturbance measurement system is essential.
At present, separable modules such as a current ring, a coaxial radio frequency cable, a receiver, a preamplifier and the like in a current method conducted disturbance measurement system are periodically calibrated respectively, but a mature checking method or device does not exist for a complete measurement system formed by combining and connecting the modules. This is because, under the prior art conditions, only two types of methods can be generally used for the accuracy check, and both methods have great limitations, poor operability, and low utilization rate. The method specifically comprises the following steps: firstly, a vector network analyzer is adopted to check a current method conducted disturbance measurement system, because a measurement part and a data reading part of the system are respectively arranged inside and outside an electromagnetic shielding room or a darkroom, the vector network analyzer is adopted to check the system, a plurality of high-performance and large-length radio frequency coaxial radio frequency cables are required to be arranged to connect system ports inside and outside the electromagnetic shielding room or the darkroom, and equipment such as the vector network analyzer, a calibration clamp and the like is required to be transported to a test site, so that the process is complicated, the consumed time is long, and the requirement on equipment conditions is high; secondly, a point frequency signal source is adopted to check the current method conducted disturbance measurement system, the method adopts the point frequency signal source and a calibration clamp to generate a point frequency signal with a certain amplitude, and then the amplitude of the point frequency signal is measured by the system to check.
Disclosure of Invention
The purpose of the utility model is: the accuracy checking device for the current method conducted disturbance measuring system is higher in accuracy and convenience, and full-band and rapid checking of the current method conducted disturbance measuring system is achieved.
In order to achieve the purpose, the technical scheme of the utility model provides an accuracy checking device for a current method conducted disturbance measuring system, which is characterized in that: the device comprises a trapezoidal pulse generating module, a coaxial radio frequency connector I, a coaxial radio frequency connector II, a transmission conductor I, a transmission conductor II, a coaxial radio frequency load and an insulating support gasket, wherein the trapezoidal pulse generating module is used for outputting trapezoidal pulses with duration, rise time and fall time of nanosecond level, forming a broadband spectrum with wide frequency range coverage, flat and continuous amplitude in a frequency domain, and providing a reference signal for full-band inspection of a current method conduction disturbance measuring system;
one end of the first coaxial radio frequency connector is connected with the output end of the trapezoidal pulse generation module, the other end of the first coaxial radio frequency connector is connected with one end of the second coaxial radio frequency connector through the first transmission conductor and the second transmission conductor respectively, and the other end of the second coaxial radio frequency connector is connected with a coaxial radio frequency load;
two ends of the first transmission conductor are respectively connected with the shaft core conductor of the first coaxial radio frequency connector and the shaft core conductor of the second coaxial radio frequency connector, and two ends of the second transmission conductor are respectively connected with the peripheral conductor of the first coaxial radio frequency connector and the peripheral conductor of the second coaxial radio frequency connector;
the insulating supporting washer is sleeved on the first transmission conductor, and a current ring of a current method conduction disturbance measuring system is sleeved on the insulating supporting washer and used for measuring radio frequency current on the first transmission conductor.
Preferably, the trapezoidal pulse has a duration of 8ns or less and the trapezoidal pulse has a rise time and a fall time of 5ns or less.
Preferably, the repetition period of the trapezoidal pulse is less than or equal to the minimum measurement residence time of the current method conducted disturbance measurement system.
Preferably, the repetition frequency of the trapezoidal pulse is smaller than the minimum measurement intermediate frequency bandwidth of the current method conducted disturbance measurement system.
Preferably, the system further comprises a vector network analyzer, wherein the vector network analyzer is used for measuring a transmission loss value of the transmission conductor passing through the current loop and compensating the measured data to evaluate the difference between the actual measured data and the theoretical calculation data.
Preferably, the first transmission conductor is sleeved on the axis of the current loop through an insulating supporting pad.
Preferably, the coaxial radio frequency load presents 50 Ω in the full frequency band of the current method conducted disturbance measurement system.
Preferably, the first coaxial radio frequency connector is connected with the output end of the trapezoidal pulse generation module through a coaxial radio frequency cable.
Preferably, the dielectric constant of the insulating support gasket is < 1.4.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model outputs trapezoidal pulse with duration, rise time and fall time of nanosecond level, repetition period smaller than the minimum measurement residence time of the current method conduction disturbance measurement system and repetition frequency smaller than the minimum measurement intermediate frequency bandwidth of the current method conduction disturbance measurement system through the trapezoidal pulse generation module, and transmits the trapezoidal pulse to two transmission conductors and a coaxial radio frequency load through the coaxial radio frequency cable and the coaxial radio frequency connector to form a fixed structure transmission line by hard connection, and the current ring of the current method conduction disturbance measurement system is clamped on the transmission conductor wrapped by the insulation support gasket to measure the radio frequency current passing through the transmission conductors. And finally, the current loop can measure a radio frequency current spectrum with flat and continuous full-band amplitude, and the radio frequency current spectrum is compared with a theoretical calculated value, so that full-band and quick accuracy check of the current method conducted disturbance measurement system is realized.
Drawings
FIG. 1 is a schematic structural diagram of an accuracy checking device for a current-method conducted disturbance measuring system according to the present invention;
FIG. 2 is a schematic diagram of a trapezoidal pulse waveform;
FIG. 3 is a diagram of an example of checking data of an accuracy checking device for an amperometric conducted disturbance measurement system according to the utility model.
Detailed Description
In order to make the utility model more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the accuracy checking device for the current-method conducted disturbance measuring system comprises a trapezoidal pulse generating module 1, a coaxial radio-frequency cable 2, two coaxial radio-frequency connectors (a coaxial radio-frequency connector I3 and a coaxial radio-frequency connector II 6), two transmission conductors (a transmission conductor I4 and a transmission conductor II 5), a coaxial radio-frequency load 7, an insulating support gasket 8 and a vector network analyzer.
As shown in fig. 2, the trapezoidal pulse generating module 1 outputs a duration (τ)0+ τ/2), rise time (τ - τ)0) 2 and fall time (. tau. -. tau.)0) And/2 is a trapezoidal pulse of nanosecond (ns) level, and aims to form a broadband frequency spectrum which is wide in frequency range coverage, flat in amplitude and continuous in frequency domain, and provide a reference signal for full-band inspection of a current method conducted disturbance measurement system.
Duration of trapezoidal pulse (tau)0+ tau/2) of 8ns or less, trapezoidal pulse (tau-tau)0) 2 and fall time (. tau. -. tau.)0) And/2 is 5ns or less, so that a broadband frequency spectrum with flat and continuous amplitude is formed in the full frequency band of the current method conducted disturbance measurement system.
The repetition period (T) of the trapezoidal pulse is less than or equal to the minimum measurement residence time of the current method conducted disturbance measurement system, namely less than or equal to 5ms, so as to avoid the amplitude collapse of the formed broadband spectrum.
The repetition frequency (1/T) of the trapezoidal pulse should be smaller than the minimum measurement intermediate frequency bandwidth of the current method conducted disturbance measurement system so as to maintain the pulse signal to present the broadband characteristic of a single pulse on the measurement frequency point.
The coaxial radio frequency cable 2 is connected with the output end of the trapezoidal pulse generation module 1 and the coaxial radio frequency connector I3 and is used for transmitting the trapezoidal pulse signal to the coaxial radio frequency connector I3 in a low-loss mode.
The first transmission conductor 4 and the second transmission conductor 5 are fixed structures which are in hard connection, wherein the first transmission conductor 4 is connected with a coaxial radio frequency connector I3 and a shaft core conductor of a coaxial radio frequency connector II 6, the second transmission conductor 5 is connected with a peripheral conductor of the coaxial radio frequency connector I3 and a peripheral conductor of the coaxial radio frequency connector II 6, so that a radio frequency transmission line is formed, and a current ring 9 of the current method conduction disturbance measurement system is clamped on the first transmission conductor 4 to measure radio frequency current passing through the transmission conductors.
An insulating support gasket 8 with low dielectric constant (< 1.4) is wrapped on the transmission conductor 4 clamped by the current ring 9 and used for placing the transmission conductor 4 at the axis position of the current ring so as to improve the accuracy and consistency of measurement results.
The fixed structure of the hard connection of the two transmission conductors adopts a vector network analyzer to measure the transmission loss value of the first transmission conductor 4 passing through the current loop 9 and compensate the measured data so as to conveniently evaluate the difference between the actual measured data and the theoretical calculation data.
The coaxial rf load 7 is connected to the coaxial rf connector two 6 in order to provide a fixed impedance value for the rf transmission line formed by the two transmission conductors in the desired frequency range.
The coaxial radio frequency load 7 presents approximately 50 omega in the full frequency band of the current method conducted disturbance measurement system.
As shown in FIG. 3, the black solid line is theoretical calculation data, and +6dB and-6 dB of the theoretical calculation data are respectively taken as an upper limit line and a lower limit line for evaluating the accuracy of the current method conducted disturbance measurement system. The black curve in fig. 3 is the measured data of the accuracy checking device for the current method conducted disturbance measurement system according to the present invention, and it can be seen that the measured data is better matched with the theoretical calculation data and meets the criterion of ± 6dB, that is, the accuracy checking result of the current method conducted disturbance measurement system meets the requirement;
the decision criterion based on the theoretical calculation value can be adjusted to be e.g. +/-3 dB, etc., depending on the actual situation of the measurement system.
Claims (9)
1. An accuracy verification device for a current method conducted disturbance measurement system is characterized in that: the device comprises a trapezoidal pulse generating module (1), a coaxial radio frequency connector I (3), a coaxial radio frequency connector II (6), a transmission conductor I (4), a transmission conductor II (5), a coaxial radio frequency load (7) and an insulating support gasket (8), wherein the trapezoidal pulse generating module (1) is used for outputting trapezoidal pulses of which the duration time, the rise time and the fall time are nanosecond levels, forming a broadband frequency spectrum which is wide in frequency range coverage, flat in amplitude and continuous, and providing a reference signal for full-band inspection of a current method conducted disturbance measuring system;
one end of the first coaxial radio-frequency connector (3) is connected with the output end of the trapezoidal pulse generation module (1), the other end of the first coaxial radio-frequency connector is connected with one end of a second coaxial radio-frequency connector (6) through a first transmission conductor (4) and a second transmission conductor (5), and the other end of the second coaxial radio-frequency connector (6) is connected with a coaxial radio-frequency load (7);
two ends of the first transmission conductor (4) are respectively connected with the axial core conductor of the first coaxial radio-frequency connector (3) and the axial core conductor of the second coaxial radio-frequency connector (6), and two ends of the second transmission conductor (5) are respectively connected with the peripheral conductor of the first coaxial radio-frequency connector (3) and the peripheral conductor of the second coaxial radio-frequency connector (6);
the insulating support gasket (8) is sleeved on the first transmission conductor (4), and a current ring (9) of the current method conduction disturbance measurement system is sleeved on the insulating support gasket (8) and used for measuring the radio frequency current on the first transmission conductor (4).
2. An accuracy verification apparatus for an amperometric conducted disturbance measurement system according to claim 1, wherein: the duration of the trapezoidal pulse is 8ns or less, and the rise time and the fall time of the trapezoidal pulse are both 5ns or less.
3. An accuracy verification apparatus for an amperometric conducted disturbance measurement system according to claim 1, wherein: the repetition period of the trapezoidal pulse is less than or equal to the minimum measurement residence time of the current method conducted disturbance measurement system.
4. An accuracy verification apparatus for an amperometric conducted disturbance measurement system according to claim 1, wherein: the repetition frequency of the trapezoidal pulse is smaller than the minimum measurement intermediate frequency bandwidth of the current method conduction disturbance measurement system.
5. An accuracy verification apparatus for an amperometric conducted disturbance measurement system according to claim 1, wherein: the system also comprises a vector network analyzer, wherein the vector network analyzer is used for measuring the transmission loss value of the transmission conductor I (4) passing through the current loop (9) and compensating the measured data so as to evaluate the difference between the actual measured data and the theoretical calculation data.
6. An accuracy verification apparatus for an amperometric conducted disturbance measurement system according to claim 1, wherein: the first transmission conductor (4) is sleeved on the axis position of the current ring (9) through an insulating support gasket (8).
7. An accuracy verification apparatus for an amperometric conducted disturbance measurement system according to claim 1, wherein: the coaxial radio frequency load (7) is 50 omega in the full frequency band of the current method conducted disturbance measurement system.
8. An accuracy verification apparatus for an amperometric conducted disturbance measurement system according to claim 1, wherein: the coaxial radio frequency connector I (3) is connected with the output end of the trapezoidal pulse generation module (1) through a coaxial radio frequency cable (2).
9. An accuracy verification apparatus for an amperometric conducted disturbance measurement system according to claim 1, wherein: the dielectric constant of the insulating support gasket (8) is less than 1.4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121737659.7U CN215953739U (en) | 2021-07-28 | 2021-07-28 | Accuracy checking device for current method conducted disturbance measuring system |
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| CN202121737659.7U CN215953739U (en) | 2021-07-28 | 2021-07-28 | Accuracy checking device for current method conducted disturbance measuring system |
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