Method and system for testing electrical performance of flexible signal cable

Abstract

The invention relates to the technical field of electrical performance testing, in particular to a flexible signal cable electrical performance testing method and system. The method comprises the following steps: acquiring signal attenuation and actual transmission rate of a signal generator under different preset output frequencies and different set transmission rates in a flexible signal cable performance test process; determining a transmission rate abnormal value according to the change conditions of the set transmission rate and the actual transmission rate of the signal generator and the deviation degree of the change conditions of the set transmission rate and the actual transmission rate; obtaining a signal transmission evaluation factor in combination with the attenuation abnormal characteristic value and the transmission rate abnormal value; according to the correlation between the signal attenuation amount and the actual transmission rate under different preset output frequencies and the change rate of the signal attenuation amount of the adjacent actual transmission rate, obtaining a relation anomaly characteristic coefficient; and evaluating the cable performance by integrating the signal transmission evaluation factor and the relation anomaly characteristic coefficient. According to the invention, the accuracy of cable performance test results is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical performance test, in particular to a flexible signal cable electrical performance test method and system. BACKGROUND

[0002] The flexible signal cable is a kind of cable for transmitting signals, has good flexibility, can stably transmit signals in dynamic environment such as bending and twisting, is the preferred cable of signal transmission carrier in the drag chain motion system, mostly uses multi-strand fine copper wire as conductor, has high flexibility, wear resistance, oil resistance, corrosion resistance, light weight, and has good signal transmission performance, and is widely used in industrial automation, electronic equipment, transportation and other application fields.

[0003] When the electrical performance of the flexible signal cable is tested, the traditional test method often focuses on the key electrical parameters such as resistance and capacitance, because the flexible signal cable is mainly used for signal transmission, and its core function is to ensure that the signal is accurately and efficiently transmitted from one end to the other end, and the signal transmission quality is directly related to the operation effect of the whole system, and the electrical performance is not comprehensive enough according to the electrical parameters such as resistance and capacitance, resulting in a certain deviation between the evaluation result of the electrical performance of the flexible signal cable and the actual situation. SUMMARY

[0004] In order to solve the problem that the evaluation result deviates from the actual situation when the existing method evaluates the electrical performance of the flexible signal cable, the purpose of the present application is to provide a flexible signal cable electrical performance test method and system, and the technical scheme adopted is as follows: In the first aspect, the present application provides a flexible signal cable electrical performance test method, which comprises the following steps: Obtaining the signal attenuation and actual transmission rate of the signal generator under different preset output frequencies and different set transmission rates in the process of testing the performance of the flexible signal cable; According to the change characteristics of the signal attenuation with the preset output frequency, the attenuation abnormal characteristic value of the flexible signal cable is determined, according to the change of the set transmission rate and the actual transmission rate of the signal generator and the deviation degree of the change of the set transmission rate and the actual transmission rate, the transmission rate abnormal value is determined, and the signal transmission evaluation factor is obtained by combining the attenuation abnormal characteristic value and the transmission rate abnormal value; According to the correlation between the signal attenuation under different preset output frequencies and the actual transmission rate, and the signal attenuation change rate between adjacent actual transmission rates, the relationship abnormal characteristic coefficient is obtained, and the performance of the flexible signal cable is evaluated by comprehensively considering the signal transmission evaluation factor and the relationship abnormal characteristic coefficient.

[0005] Preferably, the method for determining the abnormal attenuation characteristic value of the flexible signal cable according to the variation of the signal attenuation with the preset output frequency comprises the following steps: obtaining the average slope of all points on the fitting curve of the signal attenuation with the frequency, wherein the abscissa of the fitting curve of the signal attenuation with the frequency is the preset output frequency, and the ordinate is the signal attenuation; obtaining a signal attenuation characteristic value according to the difference between the average signal attenuation in the high frequency stage and the average signal attenuation in the low frequency stage, the signal attenuation of the first point on the fitting curve of the signal attenuation with the frequency, and the average slope, wherein the low frequency stage and the high frequency stage are divided based on the size of the preset output frequency, and the difference between the average signal attenuation, the signal attenuation of the first point, and the average slope are all positively correlated with the signal attenuation characteristic value; obtaining the abnormal attenuation characteristic value of the flexible signal cable according to the difference between the signal attenuations of the wave peak and the wave trough on the fitting curve of the signal attenuation with the frequency, the total number of the wave peak and the wave trough on the fitting curve of the signal attenuation with the frequency, and the signal attenuation characteristic value.

[0006] Preferably, the method for obtaining the abnormal attenuation characteristic value of the flexible signal cable according to the difference between the signal attenuations of the wave peak and the wave trough on the fitting curve of the signal attenuation with the frequency, the total number of the wave peak and the wave trough on the fitting curve of the signal attenuation with the frequency, and the signal attenuation characteristic value comprises the following steps: obtaining the maximum difference between the signal attenuations of all wave peaks and all wave troughs on the fitting curve of the signal attenuation with the frequency; multiplying the maximum difference, the total number of the wave peak and the wave trough on the fitting curve of the signal attenuation with the frequency, and the signal attenuation characteristic value to obtain the abnormal attenuation characteristic value of the flexible signal cable.

[0007] Preferably, the method for determining the abnormal transmission rate value according to the variation of the set transmission rate and the actual transmission rate of the signal generator, and the deviation degree of the variation of the set transmission rate and the actual transmission rate comprises the following steps: performing linear fitting on the set sequence and the detection sequence to obtain the slope of the fitting line, wherein the set sequence is composed of all set transmission rates, and the detection sequence is composed of all actual transmission rates; respectively obtaining the difference between each set transmission rate and the corresponding actual transmission rate, which is recorded as the deviation between the set transmission rate and the actual transmission rate; if the deviation is greater than the corresponding deviation threshold, the corresponding set transmission rate is taken as a deviation abnormal point; According to the slope of the fitting straight line, the number of deviation abnormal points, the mean of the deviations corresponding to all the deviation abnormal points and the mean of the error code rates of all the detections, a transmission rate abnormal value is obtained, the slope of the fitting straight line is negatively correlated with the transmission rate abnormal value, and the number of deviation abnormal points, the mean of the deviations corresponding to all the deviation abnormal points and the mean of the error code rates of all the detections are positively correlated with the transmission rate abnormal value.

[0008] Preferably, the attenuation abnormal characteristic value and the transmission rate abnormal value are combined to obtain a signal transmission evaluation factor, which comprises: The negative correlation of the product of the attenuation abnormal characteristic value and the transmission rate abnormal value is normalized to be a signal transmission evaluation factor.

[0009] Preferably, the signal attenuation amount change rate between adjacent actual transmission rates is obtained by: The first difference value between adjacent two signal attenuation amounts in the signal attenuation amount sequence and the second difference value between adjacent two actual transmission rates in the actual transmission rate sequence are calculated respectively, and the signal attenuation amount change rate between adjacent actual transmission rates is obtained based on the change of the first difference value with the second difference value. The signal attenuation amount sequence is composed of all the signal attenuation amounts, and the actual transmission rate sequence is composed of all the actual transmission rates.

[0010] Preferably, the relationship abnormal characteristic coefficient is obtained according to the correlation between the signal attenuation amount and the actual transmission rate under different preset output frequencies and the signal attenuation amount change rate between adjacent actual transmission rates, which comprises: The relationship abnormal characteristic coefficient is obtained according to the correlation coefficient between the signal attenuation amount sequence and the actual transmission rate sequence, the number of extreme points in the change rate curve and the maximum value of the signal attenuation amount change rate between all adjacent actual transmission rates. The correlation coefficient is used to reflect the correlation between the signal attenuation amount and the actual transmission rate under different preset output frequencies, the change rate curve is obtained by curve fitting of the signal attenuation amount change rate between all adjacent actual transmission rates, the correlation coefficient is negatively correlated with the relationship abnormal characteristic coefficient, and the number of extreme points in the change rate curve and the maximum value of the signal attenuation amount change rate are positively correlated with the relationship abnormal characteristic coefficient.

[0011] Preferably, the performance of the flexible signal cable is evaluated by combining the signal transmission evaluation factor and the relationship abnormal characteristic coefficient, which comprises: The performance evaluation value is obtained according to the signal transmission evaluation factor and the relationship abnormal characteristic coefficient, the signal transmission evaluation factor is positively correlated with the performance evaluation value, and the relationship abnormal characteristic coefficient is negatively correlated with the performance evaluation value. evaluate the performance of the flexible signal cable according to the performance evaluation value.

[0012] Preferably, the performance of the flexible signal cable is evaluated according to the performance evaluation value, including: if the performance evaluation value is greater than a preset performance threshold value, it is determined that the performance of the flexible signal cable meets the requirements; if the performance evaluation value is less than or equal to the preset performance threshold value, it is determined that the performance of the flexible signal cable does not meet the requirements.

[0013] In a second aspect, the present application provides a flexible signal cable electrical performance test system, which is used to execute the method described above, and the system includes: a data acquisition module, configured to acquire the signal attenuation and actual transmission rate of the signal generator under different preset output frequencies and different set transmission rates during the performance test of the flexible signal cable; a first evaluation module, configured to determine the attenuation abnormal characteristic value of the flexible signal cable according to the variation characteristics of the signal attenuation with the preset output frequency, determine the transmission rate abnormal value according to the variation of the set transmission rate and the actual transmission rate of the signal generator, and the deviation degree of the variation of the set transmission rate and the actual transmission rate, and obtain the signal transmission evaluation factor by combining the attenuation abnormal characteristic value and the transmission rate abnormal value; a comprehensive evaluation module, configured to obtain the relationship abnormal characteristic coefficient according to the correlation between the signal attenuation and the actual transmission rate under different preset output frequencies, and the signal attenuation rate of change between adjacent actual transmission rates, and evaluate the performance of the flexible signal cable by comprehensively considering the signal transmission evaluation factor and the relationship abnormal characteristic coefficient.

[0014] The present application has at least the following beneficial effects: The application first obtains a signal transmission evaluation factor according to the change characteristics of the signal attenuation amount with the preset output frequency in the flexible signal cable performance test process, the change of the set transmission rate and the actual transmission rate of the signal generator, and the deviation degree of the change of the set transmission rate and the actual transmission rate, the signal transmission evaluation factor is used to reflect the signal transmission quality of the flexible signal cable, that is, the application evaluates the signal transmission quality by comprehensively considering the signal transmission rate and the signal attenuation, directly reflects the performance of the cable in the actual application, and good signal transmission quality can ensure that the signal is transmitted at a stable transmission rate and the signal attenuation amount is within an acceptable range, which is the key index for measuring the advantages and disadvantages of the electrical performance of the cable; then, the abnormal relationship between the signal attenuation amount and the transmission rate is analyzed according to the mutual relationship between the signal attenuation amount and the actual transmission rate under different preset output frequencies and the signal attenuation rate between adjacent actual transmission rates, a relationship abnormal characteristic coefficient is obtained, and then the performance of the flexible signal cable is comprehensively evaluated by combining the signal transmission evaluation factor and the relationship abnormal characteristic coefficient, the electrical performance of the cable can be evaluated from the dimension of the signal transmission quality, the limitation of the traditional test method which only focuses on part of parameters such as resistance and capacitance is overcome, the electrical performance of the flexible signal cable can be comprehensively evaluated from multiple aspects, the performance of the cable in the actual signal transmission application can be more accurately and comprehensively understood, and thus the accuracy of the electrical performance test result of the flexible signal cable is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, and the advantages thereof, a brief introduction will be given to the drawings needed in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on these drawings.

[0016] Figure 1 A flowchart of a flexible signal cable electrical performance test method provided by the embodiments of the present application; Figure 2 A structural block diagram of a flexible signal cable electrical performance test system provided by the embodiments of the present application. DETAILED DESCRIPTION

[0017] In order to further illustrate the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following describes a flexible signal cable electrical performance test method and system according to the present application in detail by combining the drawings and the preferred embodiments.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0019] The application provides a flexible signal cable electrical performance test method and system.

[0020] A flexible signal cable electrical performance test method embodiment is provided. The embodiment provides a flexible signal cable electrical performance test method. Figure 1 As shown in the figure, the flexible signal cable electrical performance test method comprises the following steps: Step S1: Obtain the signal attenuation and actual transmission rate of the signal generator under different preset output frequencies and different set transmission rates in the flexible signal cable performance test process.

[0021] In order to determine the electrical performance of the flexible signal cable in terms of data transmission quality, the embodiment will first collect the signal attenuation, transmission rate and other data of the flexible signal cable. Specifically, a signal generator capable of generating a wide frequency range sine wave signal is selected to ensure that its frequency accuracy and stability meet the test requirements and that the spectrum analyzer has high sensitivity and a wide frequency range for accurate measurement of the amplitude of signals of different frequencies after transmission through the cable. The device is calibrated to ensure measurement accuracy. According to the connection mode of "signal generator → measured cable → bit error rate tester", the test link is built, the signal generator and the bit error rate tester are turned on, the signal generator sends data signals at the set initial transmission rate, and the bit error rate tester is waited for stable reading. Generally, it is waited for 1-2 minutes to ensure that the measured bit error rate reflects the situation under stable transmission. In this embodiment, it is waited for two minutes. In specific applications, the implementer can set the waiting time according to the specific situation. The transmission rate and the corresponding bit error rate at this time are recorded in the data acquisition software. According to the performance of the cable to be tested, the transmission rate of the signal generator is gradually increased, and the new transmission rate and the corresponding bit error rate are recorded after the bit error rate tester is stable. This step is repeated until the bit error rate exceeds the pre-set acceptable bit error rate threshold. The actual transmission rate under different set transmission rates is recorded. In this embodiment, the first set transmission rate is 10 Mbps, and the implementer can set the increase amount of the subsequent set transmission rate according to the specific situation. According to the connection mode of "signal generator → measured cable → spectrum analyzer", the device is connected, the signal generator is set to the lowest frequency point, for example, 1 kHz, at the same time, the amplitude of the signal generator output signal is set to a constant value to ensure that the output waveform is a sine wave. The signal generator is started to continuously output the sine wave signal with the set frequency and amplitude. Wait for 1-2 minutes to allow the signal to be fully transmitted in the cable and to reach a stable state to obtain stable signal attenuation measurement results. Adjust the center frequency of the spectrum analyzer to the output frequency of the signal generator, set an appropriate scan bandwidth, and record the amplitude and the corresponding output frequency. The output frequency of the signal generator is gradually increased, such as 1 kHz, 10 kHz, 100 kHz, …, 1 GHz, that is, the pre-set output frequencies are 1 kHz, 10 kHz, 100 kHz, …, 1 GHz. Repeat the above steps, and use the spectrum analyzer to measure and record the signal amplitude and the actual transmission rate after transmission through the cable at each pre-set output frequency after the transmission is stable. In specific applications, the implementer can set the pre-set output frequency and the set transmission rate according to the specific situation.

[0022] According to the formula , the signal attenuation under different pre-set output frequencies is calculated, wherein, represents the signal attenuation, represents the original signal amplitude output by the signal generator, represents the signal amplitude after cable transmission. The calculation method of signal attenuation is prior art, which will not be described in detail here.

[0023] At this point, the embodiment collects the signal attenuation and the actual transmission rate of the signal generator under different preset output frequencies and different set transmission rates in the flexible signal cable performance test process.

[0024] Step S2, according to the change characteristics of the signal attenuation with the preset output frequency, determine the attenuation abnormal characteristic value of the flexible signal cable; according to the change of the set transmission rate and the actual transmission rate of the signal generator, and the deviation degree of the change of the set transmission rate and the actual transmission rate, determine the transmission rate abnormal value; combine the attenuation abnormal characteristic value and the transmission rate abnormal value to obtain the signal transmission evaluation factor.

[0025] The electrical performance of the flexible signal cable will affect the signal attenuation in the signal transmission process. For the cable with good performance, the signal attenuation is relatively flat with the increase of frequency, and the change rate is relatively small. In the low frequency band, due to the good performance of the conductor and the insulating material, the signal attenuation is relatively low, and in the high frequency band, it can still maintain a certain signal transmission capacity. The signal attenuation of the cable with poor performance increases rapidly with the increase of frequency, and the change rate is large. In the low frequency band, the signal attenuation is relatively high due to the large conductor resistance, high insulating material loss and other reasons. In the high frequency band, the signal attenuation is too large, which may cause the signal to be unable to be effectively transmitted, resulting in signal loss, high error rate and other problems, which seriously affects its use in high frequency application scenarios. Therefore, first, determine the loss characteristics of the cable to be detected under different preset output frequencies.

[0026] Specifically, the abscissa is set as the preset output frequency, the ordinate is set as the signal attenuation, the signal attenuation under all preset output frequencies is mapped into the rectangular coordinate system, a plurality of data points are obtained, and curve fitting is performed on these data points. The fitting curve obtained at this time is recorded as the fitting curve of the signal attenuation with respect to the frequency. Curve fitting is prior art, which will not be described in detail here.

[0027] The average slope of all points on the fitting curve of the signal attenuation with respect to the frequency is obtained. The average slope is used to represent the change rate of the signal attenuation with respect to the frequency. The greater the average slope, the more rapidly the loss changes with the frequency. It may be because the influence of external electromagnetic interference on the signal increases rapidly, resulting in a large slope of the point on the fitting curve of the signal attenuation with respect to the frequency, and the loss increases sharply. At this time, the cable may have performance problems. The smaller the average slope, the more gently the loss changes with the frequency, and the performance of the cable is relatively stable.

[0028] In the embodiment, 10MHz is taken as the dividing point of the high-frequency stage and the low-frequency stage, the fitting curve is divided, and the low-frequency stage and the high-frequency stage are obtained. In the embodiment, the low-frequency stage is 1kHz-10MHz, and the high-frequency stage is 10MHz-1GHz. In the specific implementation, the implementer can set the dividing point according to the specific situation.

[0029] According to the difference between the signal attenuation average of the high-frequency stage and the signal attenuation average of the low-frequency stage, the signal attenuation of the first point on the fitting curve of the signal attenuation about the frequency, and the average slope of all points on the fitting curve of the signal attenuation about the frequency, a signal attenuation characteristic value is obtained. The difference between the signal attenuation average, the signal attenuation of the first point, and the average slope are all positively correlated with the signal attenuation characteristic value.

[0030] The positive correlation means that the dependent variable increases with the increase of the independent variable, and the dependent variable decreases with the decrease of the independent variable. The positive correlation can be an additive relationship, a multiplication relationship, etc., which is determined by actual application.

[0031] As a specific example, the product of the difference between the signal attenuation average of the high-frequency stage and the signal attenuation average of the low-frequency stage, the signal attenuation of the first point on the fitting curve of the signal attenuation about the frequency, and the average slope of all points on the fitting curve of the signal attenuation about the frequency is taken as the signal attenuation characteristic value of the flexible signal cable. The smaller the signal attenuation of the first point on the fitting curve of the signal attenuation about the frequency, the better the performance of the cable. The larger the signal attenuation of the first point on the fitting curve of the signal attenuation about the frequency, the higher the signal attenuation at low frequency, which may be caused by large conductor resistance, high loss of insulating material, etc. The difference between the signal attenuation average of the high-frequency stage and the signal attenuation average of the low-frequency stage is used to reflect the overall difference between the signal attenuation of the high-frequency stage and the low-frequency stage. The larger the value, the more the attenuation of the high-frequency stage and the less the attenuation of the low-frequency stage, which indicates that the signal transmission capability of the cable is poor, and the signal attenuation characteristic based on the frequency response is larger. The difference between the signal attenuation average of the high-frequency stage and the signal attenuation average of the low-frequency stage is obtained by subtracting the signal attenuation average of all points of the low-frequency stage from the signal attenuation average of all points of the high-frequency stage on the fitting curve of the signal attenuation about the frequency.

[0032] The absolute value of the difference between the signal attenuation value of each peak on the fitting curve of the signal attenuation amount with respect to the frequency and the signal attenuation value of each trough is calculated, and the absolute value is taken as the difference in signal attenuation amount between the corresponding peak and trough. There is a difference in signal attenuation amount between each peak and trough on the fitting curve. The maximum difference in signal attenuation amount between all peaks and troughs on the fitting curve of the signal attenuation amount with respect to the frequency is obtained. The greater the maximum difference, the greater the fluctuation amplitude of the curve, and the more the number of peaks and troughs, the more unstable the signal transmission, and the greater the signal attenuation abnormality characteristic.

[0033] The total number of peaks and troughs on the fitting curve of the signal attenuation amount with respect to the frequency is obtained, which can reflect the fluctuation of the fitting curve. The greater the total number, the more the fluctuation positions of the curve, and the more obvious the fluctuation degree. The fluctuation of the curve means that the signal attenuation amount changes irregularly with the frequency, indicating that the cable cannot provide a stable transmission environment for the signal. The sudden change in signal attenuation amount at certain frequency points can cause unstable signal strength, thereby affecting the accurate transmission of the signal and reducing the reliable signal transmission capability of the cable.

[0034] Based on the above characteristics, the product of the maximum difference, the total number of peaks and troughs on the fitting curve of the signal attenuation amount with respect to the frequency, and the signal attenuation characteristic value is taken as the attenuation abnormality characteristic value of the flexible signal cable.

[0035] In addition to signal attenuation, the signal transmission quality of the cable is also closely related to its signal transmission rate. In the process of cable signal transmission, the signal transmission rate directly affects the transmission delay of the signal from the sending end to the receiving end. The higher the signal transmission rate, the greater the amount of data transmitted per unit time. Higher signal transmission rate can effectively reduce transmission delay, ensure accurate transmission of the signal to the receiving end in a short time, meet real-time requirements, and improve signal transmission quality. Therefore, the detected signal propagation rate needs to be combined to determine the transmission quality of the detected cable.

[0036] Specifically, first, all the set transmission rates are arranged in the order of set transmission rate from small to large, and the sequence obtained at this time is recorded as a set sequence. The sequence of actual transmission rates corresponding to each set transmission rate is recorded as a detection sequence according to the arrangement order of the set transmission rates in the set sequence. When the electrical performance of the detected cable is good, for each set transmission rate value, the detected transmission rate is basically equal to it, that is, the set sequence and the detection sequence are highly consistent, and when the set transmission rate gradually increases, the detected transmission rate also steadily rises, and the rising trend of the two is nearly consistent. When there is a significant irregular difference between the set sequence and the detection sequence, the deviation is large, or as the data in the set sequence increases, the detection sequence does not have a significant rise, it indicates that the cable cannot accurately transmit signals at the set rate, and there may be problems such as too large conductor resistance, decreased insulation performance, poor electromagnetic shielding, etc. Electrical performance problems, which cannot maintain the set transmission rate, reflecting the performance defects in the electrical transmission rate. Based on this, the set sequence and the detection sequence are linearly fitted, and the slope of the fitted straight line is obtained. The closer the slope of the fitted straight line is to 1, the better the transmission rate of the cable, and the actual transmission rate changes synchronously with the set transmission rate. The slope of the fitted straight line is less than 1, which indicates that the transmission rate of the cable increases slowly with the increase of the set transmission rate, and the cable has certain problems in the rate improvement.

[0037] The difference between each set transmission rate and the corresponding actual transmission rate is obtained, which is recorded as the deviation between each set transmission rate and the actual transmission rate. For any set transmission rate, 10% of the set transmission rate is taken as the corresponding deviation threshold. The above method can obtain the deviation threshold corresponding to each set transmission rate, and each set transmission rate has its corresponding deviation threshold. For any set transmission rate, if the deviation between the set transmission rate and the actual transmission rate is greater than the deviation threshold corresponding to the set transmission rate, the set transmission rate is taken as a deviation abnormal point. The method can screen out multiple deviation abnormal points. The more deviation abnormal points, the more it can reflect the transmission rate problem of the cable.

[0038] Further, according to the slope of the fitted straight line, the number of deviation abnormal points, the mean of the deviations corresponding to all deviation abnormal points, and the mean of all detected bit error rates, a transmission rate abnormal value is obtained. The slope of the fitted straight line and the transmission rate abnormal value are negatively correlated. The number of deviation abnormal points, the mean of the deviations corresponding to all deviation abnormal points, and the mean of all detected bit error rates are positively correlated with the transmission rate abnormal value.

[0039] The positive correlation relationship means that the dependent variable increases with the increase of the independent variable, and decreases with the decrease of the independent variable, and can be an addition relationship, a multiplication relationship, etc., which is determined by actual application; the negative correlation relationship means that the dependent variable decreases with the increase of the independent variable, and increases with the decrease of the independent variable, and can be a subtraction relationship, a division relationship, etc., which is determined by actual application.

[0040] As a specific example, the sum of the slope of the fitting straight line and the preset adjustment parameter is calculated, and the product of the reciprocal of the sum, the number of deviation abnormal points, the mean of the deviations corresponding to all the deviation abnormal points, and the mean of all the secondary detection error rates is taken as the transmission rate abnormal value. The preset adjustment parameter is introduced when calculating the sum of the slope of the fitting straight line and the preset adjustment parameter to prevent the denominator from being 0. In this embodiment, the preset adjustment parameter is 0.01, which can be set according to specific circumstances in specific applications. The slope of the fitting straight line is corrected by using the number of deviation abnormal points and the mean of the deviations corresponding to all the deviation abnormal points. The smaller the slope of the fitting straight line, the more the deviation abnormal points, and the greater the transmission rate deviation of the deviation abnormal points, the more it can be explained that the transmission rate of the detected cable is abnormal, and the higher the error rate, the greater the transmission rate abnormal value.

[0041] Further, according to the signal attenuation abnormal characteristic and the signal transmission rate abnormal characteristic of the detected cable, the signal transmission quality of the detected cable is determined. Specifically, the negative correlation normalization result of the product of the attenuation abnormal characteristic value and the transmission rate abnormal value is taken as the signal transmission evaluation factor. The greater the signal attenuation characteristic value and the transmission rate abnormal value, the worse the signal transmission quality of the cable, and the smaller the value of the signal transmission evaluation factor. In this embodiment, the specific process of negative correlation normalization processing of the product is that the exponential function value with the natural constant as the base number and the negative product as the index is taken as the negative correlation normalization result of the product.

[0042] At this point, the signal transmission evaluation factor is obtained by using the above method.

[0043] Step S3: According to the correlation between the signal attenuation amount and the actual transmission rate under different preset output frequencies, and the signal attenuation amount change rate between adjacent actual transmission rates, a relationship abnormal characteristic coefficient is obtained; and the signal transmission evaluation factor and the relationship abnormal characteristic coefficient are integrated to evaluate the performance of the flexible signal cable.

[0044] In the process of cable signal transmission, signal attenuation and signal transmission rate are closely related and influence each other, and both of them determine the signal transmission quality of the cable. The signal transmission quality obtained above ignores the mutual correlation of the two in the process of cable use, so it needs to be further adjusted.

[0045] During the process of cable signal transmission, the increase of transmission rate is often accompanied by the increase of signal frequency. With the increase of transmission rate, the signal attenuation will increase to a certain extent. Since the electrical parameters inside the cable are relatively stable, various loss mechanisms change with frequency according to their inherent characteristics. Therefore, the increase is relatively regular, and the signal attenuation gradually increases with the increase of frequency corresponding to the transmission rate. When the electrical performance is abnormal, the relationship between the two may fluctuate abnormally. For example, at certain transmission rates, the attenuation may suddenly increase greatly, rather than changing according to the normal law.

[0046] Based on the above characteristics, all signal attenuations under all preset output frequencies are arranged in order from small to large according to the preset output frequency, and a signal attenuation sequence is obtained. All actual transmission rates under all preset output frequencies are arranged in order from small to large according to the preset output frequency, and an actual transmission rate sequence is obtained. The difference between two adjacent signal attenuations in the signal attenuation sequence is calculated, and the difference is recorded as a first difference. There is a first difference between every two adjacent elements in the signal attenuation sequence. The difference between two adjacent actual transmission rates in the actual transmission rate sequence is calculated, and the difference is recorded as a second difference. There is a second difference between every two adjacent elements in the actual transmission rate sequence. It should be noted that the first difference and the second difference between the two adjacent elements are the difference between the latter element and the former element.

[0047] Next, based on the change of the first difference value with the second difference value, the signal attenuation amount change rate between adjacent actual transmission rates is obtained, and in this embodiment, a specific calculation method of the signal attenuation amount change rate between adjacent actual transmission rates is given: the ratio between each first difference value and the second difference value corresponding thereto is taken as the signal attenuation amount change rate between the corresponding adjacent actual transmission rates, wherein for any first difference value, if the first difference value is the difference between the first signal attenuation amount and the second signal attenuation amount in the signal attenuation amount sequence, the second difference value corresponding thereto is the difference between the first actual transmission rate and the second actual transmission rate in the actual transmission rate sequence; if the first difference value is the difference between the second signal attenuation amount and the third signal attenuation amount in the signal attenuation amount sequence, the second difference value corresponding thereto is the difference between the second actual transmission rate and the third actual transmission rate in the actual transmission rate sequence; and so on. It should be noted that if the second difference value is 0, the sum of the second difference value and a preset zero-prevention parameter is calculated, and the ratio between the first difference value and the sum is taken as the signal attenuation amount change rate between the corresponding adjacent actual transmission rates. In order to reduce the influence of the zero-prevention parameter on the calculation result, the zero-prevention parameter should be set small enough, and in this embodiment, the zero-prevention parameter is 0.00001, which can be set according to specific conditions in specific applications. By using the above method, multiple signal attenuation amount change rates can be obtained.

[0048] When the electrical performance of the detected cable is good, the signal attenuation amount change rate is relatively stable, and if the signal attenuation amount change rate fluctuates greatly without obvious rules, or suddenly increases or decreases, it indicates that the change of the signal attenuation amount with the transmission rate is abnormal, reflecting that the electrical performance of the cable is poor.

[0049] The Pearson correlation coefficient between the signal attenuation amount sequence and the actual transmission rate sequence is calculated, and the Pearson correlation coefficient is taken as the correlation coefficient between the signal attenuation amount sequence and the actual transmission rate sequence. The correlation coefficient is used to reflect the correlation between the signal attenuation amount and the actual transmission rate under different preset output frequencies, and the greater the correlation coefficient, the stronger the correlation between the signal attenuation amount sequence and the actual transmission rate sequence. The change rate curve is obtained by curve fitting of the signal attenuation amount change rates between all adjacent actual transmission rates, the abscissa of the change rate curve is the order value, and the ordinate is the signal attenuation amount change rate. The number of extreme points in the change rate curve is obtained.

[0050] Further, a relationship abnormality feature coefficient is obtained according to a correlation coefficient between the signal attenuation amount sequence and the actual transmission rate sequence, a number of extreme points in a change rate curve, and a maximum value of signal attenuation amount change rates between all adjacent actual transmission rates; the correlation coefficient and the relationship abnormality feature coefficient are in a negative correlation relationship, and both the number of extreme points in the change rate curve and the maximum value of the signal attenuation amount change rates are in a positive correlation relationship with the relationship abnormality feature coefficient.

[0051] As a specific example, a sum of the correlation coefficient and a preset first parameter is calculated, and a product of the sum, the number of extreme points in the change rate curve, and the maximum value of the signal attenuation amount change rates between all adjacent actual transmission rates is taken as the relationship abnormality feature coefficient. The preset first parameter is introduced in the calculation of the relationship abnormality feature coefficient to prevent the denominator from being 0, and the preset first parameter is 1.01. In specific applications, the implementer can set the preset first parameter according to specific conditions.

[0052] Next, a performance evaluation value is obtained according to the signal transmission evaluation factor and the relationship abnormality feature coefficient; the signal transmission evaluation factor and the performance evaluation value are in a positive correlation relationship, and the relationship abnormality feature coefficient and the performance evaluation value are in a negative correlation relationship.

[0053] As a specific example, a ratio between the signal transmission evaluation factor and the relationship abnormality feature coefficient is calculated, and a normalized result of the ratio is taken as the performance evaluation value. There are many methods for normalizing data, and the implementer can select an existing data normalization method according to specific conditions to process the data, so that the normalized result of the ratio is in a range of (0, 1). The greater the signal transmission evaluation factor and the smaller the relationship abnormality feature coefficient, the better the signal transmission quality and the better the performance of the flexible signal cable, and the greater the adjusted transmission quality evaluation value and the performance evaluation value.

[0054] The greater the performance evaluation value, the better the comprehensive performance of the flexible signal cable. Therefore, if the performance evaluation value is greater than a preset performance threshold, it is determined that the performance of the flexible signal cable meets the requirements; if the performance evaluation value is less than or equal to the preset performance threshold, it is determined that the performance of the flexible signal cable does not meet the requirements. In this embodiment, the preset performance threshold is 0.7, and the implementer can set the preset performance threshold according to specific conditions in specific applications.

[0055] At this point, the method provided in this embodiment is used to complete the test on the electrical performance of the flexible signal cable.

[0056] The embodiment first obtains a signal transmission evaluation factor according to the variation characteristic of the signal attenuation amount with the preset output frequency, the variation of the set transmission rate and the actual transmission rate of the signal generator, and the deviation degree of the variation of the set transmission rate and the actual transmission rate in the flexible signal cable performance test process, the signal transmission evaluation factor is used for reflecting the signal transmission quality of the flexible signal cable, that is, the embodiment comprehensively evaluates the signal transmission quality by combining the signal transmission rate and the signal attenuation, directly reflects the performance of the cable in the actual application, and good signal transmission quality can ensure that the signal is transmitted at a stable transmission rate and the signal attenuation amount is within an acceptable range, which is a key index for measuring the advantages and disadvantages of the electrical performance of the cable in the actual application; then, the relationship between the signal attenuation amount and the transmission rate is analyzed according to the mutual relationship between the signal attenuation amount and the actual transmission rate under different preset output frequencies and the signal attenuation rate between adjacent actual transmission rates, a relationship abnormal characteristic coefficient is obtained, and then the performance of the flexible signal cable is comprehensively evaluated by combining the signal transmission evaluation factor and the relationship abnormal characteristic coefficient, the method provided by the embodiment can evaluate the electrical performance of the cable from the dimension of the signal transmission quality, overcome the limitation of the traditional test method which only focuses on part parameters such as resistance and capacitance, enable the electrical performance of the flexible signal cable to be comprehensively evaluated from multiple aspects, ensure that the performance of the cable in the actual signal transmission application is more accurately and comprehensively understood, and thus the accuracy of the electrical performance test result of the flexible signal cable is improved.

[0057] A flexible signal cable electrical performance test system embodiment: Referring to Figure 2 , which shows a structural block diagram of a flexible signal cable electrical performance test system provided by an embodiment of the present application, the system can include a data acquisition module, a first evaluation module and a comprehensive evaluation module.

[0058] The data acquisition module is used for obtaining the signal attenuation amount and the actual transmission rate of the signal generator under different preset output frequencies and different set transmission rates in the flexible signal cable performance test process. The first evaluation module is used for determining an attenuation abnormal characteristic value of the flexible signal cable according to the variation characteristic of the signal attenuation amount with the preset output frequency, determining a transmission rate abnormal value according to the variation of the set transmission rate and the actual transmission rate of the signal generator and the deviation degree of the variation of the set transmission rate and the actual transmission rate, and obtaining a signal transmission evaluation factor by combining the attenuation abnormal characteristic value and the transmission rate abnormal value. The comprehensive evaluation module is configured to obtain a relationship anomaly characteristic coefficient according to a correlation between the signal attenuation amount and the actual transmission rate under different preset output frequencies and a signal attenuation amount change rate between adjacent actual transmission rates; and evaluate the performance of the flexible signal cable by comprehensively considering the signal transmission evaluation factor and the relationship anomaly characteristic coefficient.

[0059] It should be understood that, Figure 2 It should be understood that, The system and modules thereof can be implemented in various ways. For example, in some embodiments, the system and modules thereof can be implemented in hardware, software, or a combination of software and hardware. The hardware portion can be implemented with special logic, while the software portion can be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or a specially designed hardware. Those skilled in the art can understand that the above-mentioned method and system can be implemented using computer executable instructions and / or included in processor control code, such as provided on a carrier medium, such as a magnetic disk, CD or DVD-ROM, a programmable memory, such as a read-only memory (firmware), or a data carrier, such as an optical or electronic signal carrier. The system and modules thereof of the present specification can be implemented not only in hardware circuitry, such as very large scale integrated circuits or gate arrays, semiconductors, such as logic chips, transistors, or programmable hardware devices, such as field programmable gate arrays, programmable logic devices, etc., but also in software, for example, executed by various types of processors, and can also be implemented by a combination of the above-mentioned hardware circuitry and software (for example, firmware).

[0060] Further details of the above-mentioned modules can be referred to other places in the present specification, and will not be described here.

[0061] In other embodiments, a flexible signal cable electrical performance testing device is also provided, which includes a memory and a processor. The memory is configured to store executable program code, and the processor is configured to call and run the executable program code from the memory, so that the device performs the above-mentioned flexible signal cable electrical performance testing method. The device can be a chip, an assembly or a module, and the chip can include a connected processor and a memory. The memory is configured to store instructions, and when the processor calls and executes the instructions, the chip can perform the above-mentioned flexible signal cable electrical performance testing method provided by the embodiments.

[0062] In other embodiments, a computer program product is also provided, which, when running on a computer, causes the computer to perform the above-mentioned related steps to realize the above-mentioned flexible signal cable electrical performance testing method provided by the embodiments.

[0063] In other embodiments, a computer readable storage medium is also provided, and the computer readable storage medium stores computer program codes, when the computer program codes are run on a computer, the computer is caused to execute the above-mentioned related method steps to realize the flexible signal cable electrical performance test method provided by the above-mentioned embodiments.

[0064] The system, the electronic device, the computer program product and the computer readable storage medium are used to execute the corresponding method provided above, and the beneficial effects achieved thereby can refer to the beneficial effects of the corresponding method provided above, which will not be described here.

[0065] It should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for testing the electrical performance of a flexible signal cable, characterized in that: The method comprises the following steps: Obtain the signal attenuation and actual transmission rate of the signal generator at different preset output frequencies and different set transmission rates during the flexible signal cable performance test; Determine the attenuation abnormality characteristic value of the flexible signal cable based on the variation characteristics of the signal attenuation with the preset output frequency; determine the transmission rate abnormality value based on the variation of the set transmission rate and the actual transmission rate of the signal generator, as well as the degree of deviation between the set transmission rate and the actual transmission rate; and obtain the signal transmission evaluation factor by combining the attenuation abnormality characteristic value and the transmission rate abnormality value. Based on the correlation between the signal attenuation and the actual transmission rate at different preset output frequencies and the rate of change of the signal attenuation between adjacent actual transmission rates, the relationship anomaly characteristic coefficient is obtained; the performance of the flexible signal cable is evaluated by combining the signal transmission evaluation factor and the relationship anomaly characteristic coefficient.

2. A method for testing electrical performance of a flexible signal cable according to claim 1, characterized in that: The determining of the abnormal attenuation characteristic value of the flexible signal cable according to the variation characteristics of the signal attenuation with the preset output frequency includes: Obtaining the slope mean of all points on a fitting curve of signal attenuation with respect to frequency, wherein the abscissa of the fitting curve of signal attenuation with respect to frequency is the preset output frequency, and the ordinate is the signal attenuation; Obtaining a signal attenuation characteristic value based on a difference between a mean value of signal attenuation in the high-frequency stage and a mean value of signal attenuation in the low-frequency stage, a signal attenuation at a first point on a fitting curve of signal attenuation with respect to frequency, and a slope mean value, wherein the low-frequency stage and the high-frequency stage are divided based on a preset output frequency, and the difference between the mean values ​​of signal attenuation, the signal attenuation at the first point, and the slope mean value are all positively correlated with the signal attenuation characteristic value; The attenuation abnormality characteristic value of the flexible signal cable is obtained according to the difference in signal attenuation between the peak and the trough on the fitting curve of the signal attenuation with respect to frequency, the total number of peaks and troughs on the fitting curve of the signal attenuation with respect to frequency, and the signal attenuation characteristic value.

3. A method for testing electrical performance of a flexible signal cable according to claim 2, characterized in that: The method of obtaining the attenuation abnormality characteristic value of the flexible signal cable according to the difference in signal attenuation between the peak and the trough on the fitting curve of the signal attenuation with respect to the frequency, the total number of peaks and troughs on the fitting curve of the signal attenuation with respect to the frequency, and the signal attenuation characteristic value comprises: Obtain the maximum difference in signal attenuation between all peaks and all troughs on the fitting curve of signal attenuation with respect to frequency; The product of the maximum difference, the total number of peaks and troughs on the fitting curve of the signal attenuation with respect to frequency, and the signal attenuation characteristic value is used as the attenuation abnormality characteristic value of the flexible signal cable.

4. A method for testing electrical performance of a flexible signal cable according to claim 1, characterized in that: The determining of the transmission rate abnormal value according to the change of the set transmission rate and the actual transmission rate of the signal generator and the degree of deviation between the change of the set transmission rate and the actual transmission rate includes: Fitting a set sequence and a detection sequence by a straight line to obtain a slope of the fitted straight line, wherein the set sequence is composed of all set transmission rates and the detection sequence is composed of all actual transmission rates; The difference between each set transmission rate and the corresponding actual transmission rate is obtained respectively, and recorded as the deviation between each set transmission rate and the actual transmission rate; if the deviation is greater than the corresponding deviation threshold, the corresponding set transmission rate is regarded as a deviation abnormal point; The transmission rate anomaly value is obtained according to the slope of the fitting straight line, the number of deviation anomaly points, the mean of the deviations corresponding to all deviation anomaly points, and the mean of the bit error rates of all detections. The slope of the fitting straight line is negatively correlated with the transmission rate anomaly value, and the number of deviation anomaly points, the mean of the deviations corresponding to all deviation anomaly points, and the mean of the bit error rates of all detections are positively correlated with the transmission rate anomaly value.

5. The method for testing electrical performance of a flexible signal cable according to claim 1, wherein: The combining of the attenuation abnormality characteristic value and the transmission rate abnormality value to obtain the signal transmission evaluation factor includes: The negative correlation normalization result of the product of the attenuation anomaly characteristic value and the transmission rate anomaly value is used as the signal transmission evaluation factor.

6. A method for testing electrical performance of a flexible signal cable according to claim 1, characterized in that: Acquiring the signal attenuation change rate between adjacent actual transmission rates includes: Calculating a first difference between two adjacent signal attenuations in the signal attenuation sequence and a second difference between two adjacent actual transmission rates in the actual transmission rate sequence; and obtaining a signal attenuation change rate between adjacent actual transmission rates based on a change in the first difference relative to the second difference. The signal attenuation sequence is composed of all signal attenuations, and the actual transmission rate sequence is composed of all actual transmission rates.

7. A method for testing electrical performance of a flexible signal cable according to claim 6, characterized in that: Obtaining the abnormal relationship characteristic coefficient according to the correlation between the signal attenuation and the actual transmission rate at different preset output frequencies and the signal attenuation change rate between adjacent actual transmission rates includes: Obtain the relationship anomaly characteristic coefficient based on the correlation coefficient between the signal attenuation sequence and the actual transmission rate sequence, the number of extreme value points in the change rate curve, and the maximum value of the signal attenuation change rate between all adjacent actual transmission rates; The correlation coefficient is used to reflect the correlation between the signal attenuation and the actual transmission rate under different preset output frequencies. The change rate curve is obtained by curve fitting the signal attenuation change rate between all adjacent actual transmission rates. The correlation coefficient is negatively correlated with the relationship abnormality characteristic coefficient, and the number of extreme points in the change rate curve and the maximum value of the signal attenuation change rate are both positively correlated with the relationship abnormality characteristic coefficient.

8. The method for testing electrical performance of a flexible signal cable according to claim 1, wherein: The comprehensive signal transmission evaluation factor and the relationship abnormality characteristic coefficient are used to evaluate the performance of the flexible signal cable, including: Obtaining a performance evaluation value according to a signal transmission evaluation factor and a relationship abnormality characteristic coefficient, wherein the signal transmission evaluation factor is positively correlated with the performance evaluation value, and the relationship abnormality characteristic coefficient is negatively correlated with the performance evaluation value; The performance of the flexible signal cable is evaluated based on the performance evaluation value.

9. A method for testing electrical performance of a flexible signal cable according to claim 8, characterized in that: The evaluating the performance of the flexible signal cable according to the performance evaluation value includes: If the performance evaluation value is greater than a preset performance threshold, it is determined that the performance of the flexible signal cable meets the requirements; If the performance evaluation value is less than or equal to the preset performance threshold, it is determined that the performance of the flexible signal cable does not meet the requirements.

10. A flexible signal cable electrical performance testing system, the system being used to perform the method according to claim 1, characterized in that: The system comprises: A data acquisition module is used to obtain the signal attenuation and actual transmission rate of the signal generator at different preset output frequencies and different set transmission rates during the performance test of the flexible signal cable; The first evaluation module is configured to determine an attenuation anomaly characteristic value of the flexible signal cable based on a characteristic of a change in signal attenuation as a function of a preset output frequency; determine a transmission rate anomaly value based on a change in a set transmission rate and an actual transmission rate of the signal generator, as well as a degree of deviation between the set transmission rate and the actual transmission rate; and obtain a signal transmission evaluation factor by combining the attenuation anomaly characteristic value and the transmission rate anomaly value. The comprehensive evaluation module is used to obtain the relationship anomaly characteristic coefficient based on the correlation between the signal attenuation and the actual transmission rate at different preset output frequencies, and the rate of change of the signal attenuation between adjacent actual transmission rates; and to evaluate the performance of the flexible signal cable by combining the signal transmission evaluation factor and the relationship anomaly characteristic coefficient.

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