CN110412371A - Multi-coaxial cable assembly shield effectiveness detection method based on probe method - Google Patents
Multi-coaxial cable assembly shield effectiveness detection method based on probe method Download PDFInfo
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- CN110412371A CN110412371A CN201910657739.2A CN201910657739A CN110412371A CN 110412371 A CN110412371 A CN 110412371A CN 201910657739 A CN201910657739 A CN 201910657739A CN 110412371 A CN110412371 A CN 110412371A
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- coaxial cable
- cable assembly
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- probe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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Abstract
The multi-coaxial cable assembly shield effectiveness detection method based on probe method that the invention proposes a kind of includes the following steps: 1) to carry out test system configurations according to probe method principle;2) before test starts, test equipment, which is powered, to be preheated and reaches steady-working state, is calibrated to test macro, guarantees that measured deviation is no more than acceptable range;3) frequency and level in setting signal source, Injection Signal is to multi-coaxial cable assembly core wire and reaches steady-working state;4) current probe is stuck on multi-coaxial cable assembly to be measured;5) bandwidth and the testing time of receiver are set, is scanned in applicable frequency range and chooses maximum value.Present device simplifies, save plate jig, common multicore cable, that is, feed cable is measured, it can be achieved that the influence under multi-coaxial cable assembly earthing mode treatment conditions to shield effectiveness measures, can be applied to carry out quantitative detection to common multi-coaxial cable assembly shield effectiveness.
Description
Technical field
The invention belongs to basic test technical fields.
Background technique
Due to the development that equipment high power is integrated, ambient electromagnetic field such as nuclear electromagnetic pulse is this more harsh to be wanted
It asks, the shielding design of multi-coaxial cable assembly has become the developing direction of electromagnetic compatibility technology.Multi-coaxial cable assembly, that is, multicore cable
The general name welded with connector, as shown in Figure 3.In order to improve the shielding properties of multi-coaxial cable assembly, the braided parameter of shielded layer
It is required with earthing mode higher and higher;The other factors such as terrain clearance, cable length and mounting means influence shielding properties
It is very big.Therefore the shield effectiveness for obtaining multi-coaxial cable assembly under multifactor impact is even more important, it is therefore necessary to pass through detection technique pair
Shield effectiveness is tested, and shielding design effect expected from equipment could be obtained.And the shield effectiveness of existing cable-assembly has very
It is more, such as Reverberation room method, coaxial method, Absorbing Clamp method and current probe method, but both for the cable group of coaxial line type
Part lacks the method for examination to multi-core cable component.Because the dielectric and size of coaxial cable can satisfy impedance matching
Requirement, and multicore cable is all less susceptible to meet the requirement of impedance matching.The inner conductor of the coaxial cable and shielded layer constitute two ends
Mouthful network, simulation calculation or test can be convenient, uniquely determine its characteristic impedance, and multicore cable core, core and shielding
Layer constitutes several two-port networks, and the characteristic impedance of each two-port network is related to the parameter of each Two-port netwerk, simulation calculation
Or it is difficult to determine its characteristic impedance when test.Different earthing modes has a significant impact to the shield effectiveness of multi-coaxial cable assembly,
In equipment investment before use, the design phase has contemplated that shielding design, the cable that for example outdoor equipment uses can be using shielding
Cable, but do not select in cable-assembly design can the connector that connects of 360 ° of rings, or using single wire ground, to generate electricity
Magnetic compatibling problem, therefore be verified using 360 ° of earthing modes in overall test, but not individually examination verifying, lack data
Support.
Therefore, in view of the above-mentioned problems, it is necessary to provide a kind of detection methods of multi-coaxial cable assembly shield effectiveness.
Summary of the invention
To guarantee that the earthing mode of multi-coaxial cable assembly meets shield effectiveness design requirement, the invention proposes one kind to be based on
The multi-coaxial cable assembly shield effectiveness detection method of probe method, steps are as follows:
S1: as shown in Figure 1, carrying out test system configurations, and signal source is connected with casing 2, and load is connected with casing 1, receives
Machine is connected with current probe;
S2: before test starts, test equipment, which is powered, to be preheated and reaches steady-working state, is calibrated to test macro,
Guarantee that measured deviation is no more than tolerance interval;Checking signal is applied to current probe respectively, with oscilloscope measurement electric current electricity
It is flat, check whether current waveform is sine wave, the measurement error of the measured value of receiver and oscillograph tolerance interval it
It is interior;
S3: the frequency and level in setting signal source, Injection Signal to multi-coaxial cable assembly core wire simultaneously reach steady operation shape
The dynamic range of state, the setting of signal source output signal should be greater than the shield effectiveness of test cable;
S4: current probe is stuck on multi-coaxial cable assembly to be measured;
S5: being arranged bandwidth and the testing time of receiver, scans in applicable frequency range and chooses maximum value.
The present invention can detecte different earthing mode multi-coaxial cable assembly shield effectiveness, detection frequency range be 10kHz~
500MHz.Compared with the existing technology, this technology has the following characteristics that the use for 1) avoiding two current probes of probe method, only
It needs to reduce equipment amount using a current probe;2) frequency range can be popped one's head in down to DC using EZ-17;3) it can detect multicore
The shield effectiveness of CA cable assembly estimates the energy for being actually implanted into coupling by the standing-wave ratio of first test macro, and with measurement
Shielded layer coupling amount can calculate the shield effectiveness under non-matched state, i.e., the shield effectiveness of true multi-coaxial cable assembly.
4) the detection method used test fixture standing wave is smaller, overcomes the limitation for pouring into signal, increases the practicability of method.
Detailed description of the invention
Fig. 1 is based on probe method multi-coaxial cable assembly shield effectiveness detection method composition block diagram.
Fig. 2 is based on probe method multi-coaxial cable assembly shield effectiveness detection method functional block diagram.
Fig. 3 multi-coaxial cable assembly schematic diagram.
Fig. 4 multicore cable schematic cross-section.
Fig. 5 multi-coaxial cable assembly shield effectiveness comparison diagram.
In figure: 1, pin connector;2, multicore cable;3, shielded layer;4, core wire.
Specific embodiment
The multi-coaxial cable assembly shield effectiveness detection method based on probe method that the invention proposes a kind of, using following step
It is rapid:
S1: test system configurations are carried out by Fig. 1, guarantee test equipment calibration certificate before the deadline;Signal source and casing 2
It is connected, load is connected with casing 1, and receiver is connected with current probe;
S2: before test starts, test equipment, which is powered, to be preheated and reaches steady-working state, is calibrated to test macro,
Guarantee that measured deviation is no more than ± 3dB;Checking signal is applied to current probe respectively, with oscilloscope measurement current level, inspection
Look into whether current waveform is sine wave, the measured value of receiver and the measurement error of oscillograph are within ± 3dB;
S3: the frequency and level in setting signal source, Injection Signal to multi-coaxial cable assembly core wire simultaneously reach steady operation shape
State, signal source output signal are set as -30dBm, frequency selection purposes 10kHz, 1MHz, 10MHz, 30MHz, 100MHz, 300MHz,
This 7 characteristic frequency points of 400MHz;
S4: current probe is stuck on multi-coaxial cable assembly to be measured, chooses three characteristic feature positions: multi-coaxial cable assembly
Position and multi-coaxial cable assembly middle position at connector two;
S5: being arranged bandwidth and the testing time of receiver, scans in applicable frequency range and chooses maximum value;It differentiates
Rate bandwidth uses 10kHz, time of measuring 1s;
4) 5) S6: 3) other multi-coaxial cable assemblies are repeated respectively;Multi-coaxial cable assembly is divided into four kinds: 360 ° of shielded layer and connects
Ground, inner lead ground connection, outside lead ground connection and shielded layer are earth-free.
Further, the connector of casing 1 and casing 2 is serial for XC, YM in the S1, i.e. XC158/24F4K1P13,
YMB24F5Z1P40, YMD36F4Z1P40, YMG24F4Z1P40 and YMH36F4K1P40 and N series connector, that is, N-
KFD161.What it is due to shield effectiveness reflection is the intrinsic electromagnetic property of CA cable assembly, is inherently seen, size is not dependent on line
Core number, therefore core can be shorted, i.e., handled more cores for " single core ", such core and shielded layer just constitute one
Then a two-port network, actually Xu are used XC, YM series connector and N series connector at an equivalent coaxial line
Conducting wire is connected.
Further, in the S2 test macro calibrate when, need to consider line footpath be lost, if measured value deviation be more than ±
3dB error identifying reason and will then correct before test, guarantee the integrality of test cable.
Further, signal source pours into core wire signal in the S3, needs not move through power amplifier, because of the machine of design
Shell 1 and the standing-wave ratio of 2 signal of casing transmission are little, and the energy for being actually implanted into coupling is larger, by verifying, directly pours into signal energy
Enough meet multi-coaxial cable assembly shield effectiveness dynamic range requirement.
Further, in the S4 current probe test position, should be theoretically entire multi chip module whole length
The maximum value in direction, practical engineering experience analysis, the treatment effect and cable of joint grounding measures are because self weight reason is in centre
Position will appear bending degree most serious and happen, therefore this be can guarantee and measure maximum leakage value in position at three.
Further, it is particularly significant to the integrality for keeping acquired data that ambient level is controlled in the S5, because high
The presence of ambient level makes it difficult to distinguish the transmitting signal or environmental signal that signal collected is EUT, therefore test site
Selection can reject the influence of ambient level in EMC test room.
Further, multi-coaxial cable assembly is common power supply line in the S6, and 20 by test agent in total, and earthing mode is such as
Described above is common grounding measures, and sample size is able to verify that the validity of detection method.The connector of sample includes
XC158/24T4Z1P13+XC158/24FJ7P40、YMB24T5K1P40+YM24AP40、YMD36T4K1P40+YM36AP40、
YMG24T4K1P40+YMG24AP40, YMH36T4Z1P40+YMH36FS, and multicore cable selection JE85/SC-4*2.5 (5) and
JE85/SC-4*6(5)。
Above-mentioned multi-coaxial cable assembly sample detects in this way, and different earthing mode shield effectiveness difference is obvious.From survey
As can be seen that the detection method is effective and feasible in test result Fig. 5, data error is within an acceptable range.
Claims (3)
1. the multi-coaxial cable assembly shield effectiveness detection method based on probe method, it is characterised in that:
S1: carrying out test system configurations, and signal source is connected with casing (2), and load is connected with casing (1), and receiver and electric current are visited
Head is connected;
S2: before test starts, test equipment, which is powered, to be preheated and reaches steady-working state, is calibrated, is guaranteed to test macro
Measured deviation is no more than tolerance interval;Checking signal is applied to current probe respectively, with oscilloscope measurement current level, inspection
Look into whether current waveform is sine wave, the measured value of receiver and the measurement error of oscillograph are within tolerance interval;
S3: the frequency and level in setting signal source, Injection Signal to multi-coaxial cable assembly core wire simultaneously reach steady-working state, letter
The Dynamic Range of number source output signal setting should be greater than the shield effectiveness of test cable;
S4: current probe is stuck on multi-coaxial cable assembly to be measured;
S5: being arranged bandwidth and the testing time of receiver, scans in applicable frequency range and chooses maximum value.
2. the multi-coaxial cable assembly shield effectiveness detection method according to claim 1 based on probe method, it is characterised in that:
The casing (1), casing (2) are used to realize the signal conversion of different connector series, and multi-coaxial cable assembly is using XC, YM system
Column connector, and test macro uses N series connector.
3. the multi-coaxial cable assembly shield effectiveness detection method according to claim 1 based on probe method, characteristic are:
The multicore cable of the multi-coaxial cable assembly is shielded cable, and private company shares internal core wire weaves bunchy, and each personal share internal core wire does not include
Mesh grid, outside include mesh grid, and material is that copper is silver-plated, braiding beam 16, bundle conductor 6, and 18.7 ° of braid angle, thickness 0.15mm.
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Cited By (3)
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CN110736953A (en) * | 2019-12-20 | 2020-01-31 | 深圳市鼎阳科技股份有限公司 | digital oscilloscope checking device |
CN112731069A (en) * | 2020-12-23 | 2021-04-30 | 北京无线电计量测试研究所 | Time domain pulse cable shielding effectiveness test method and system |
CN114264851A (en) * | 2021-12-22 | 2022-04-01 | 北京大泽科技有限公司 | Electromagnetic shielding attenuation measurement method for shielded cable |
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CN110736953A (en) * | 2019-12-20 | 2020-01-31 | 深圳市鼎阳科技股份有限公司 | digital oscilloscope checking device |
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CN114264851A (en) * | 2021-12-22 | 2022-04-01 | 北京大泽科技有限公司 | Electromagnetic shielding attenuation measurement method for shielded cable |
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Application publication date: 20191105 |