92results about How to "Solve the traceability problem" patented technology

The invention relates to a temperature measurement and calibration platform in space vacuum environment. The temperature measurement and calibration platform is favorable for realizing the simultaneous calibration of contact type temperature measurement and non-contact type temperature measurement, so the temperature measurement and calibration platform is served for heat vacuum and heat balance experiments of spacecrafts such as satellites, spaceship and the like. The temperature measurement and calibration platform comprises a constant temperature bath, wherein a double-sub-cavity vacuum cavity, the double-sub-cavity vacuum cavity comprises a first vacuum cavity body and a second vacuum cavity body, the first vacuum cavity body and the second vacuum cavity body are connected with a vacuum pumping device through a three-way valve, standard temperature indicator sensors are respectively arranged on the outer wall of the first vacuum cavity body and on the outer wall of the second vacuum cavity body, the standard temperature indicator sensors are connected with a temperature secondary meter, a laser light path reflecting device is arranged in the vacuum cavity of the first vacuum cavity body for calibrating a non-contact type temperature measuring system based on the tunable diode laser absorption spectrum technology, and the vacuum cavity of the second vacuum cavity body is used for accommodating a temperature sensor for calibrating a contact type temperature measuring system adopting the temperature sensor.

The invention relates to an IPv6 address structure and a method and a device for allocating and tracing the same. The structure comprises a network prefix and an interface identifier, wherein the interface identifier is obtained by calculating bits for recording user identification information with the asymmetrical encryption algorithm; and the network prefix or the interface identifier also comprises pre-defined bits used for identifying the used encryption algorithm, the class of the user identification information and other information. During tracing, enciphered bits in the interface identifier are deciphered by using a private key to obtain the user information. When allocating addresses, the invention adds the user identification information having the identification function, and then finds out the hose corresponding to the source address based on the user identification information during tracing, thereby solving the problem of IPv6 network tracing.

The invention discloses a method and device for measuring direct current magnetic bias error characteristics of a current transformer. Current is simulated into a power frequency current source and a direct-current current source according to an equal ampere-turn principle, wherein the power frequency current source and the direct-current current source are independent, the standard computed tomography CT is used for detecting variation of error characteristics of the measured CT influenced by direct current magnetic bias, a method and device for measuring current comparison type error characteristics or voltage comparison type error characteristics is included, data can be compared in a whole process, and the method and device is suitable for measurement of error characteristics of during direct current magnetic bias of a straight through current transformer and also suitable for checking direct current magnetic bias error characteristics of current transformer coils made of different iron core materials.

The invention provides a traffic-free fraud user recognition method and recognition system. The recognition method comprises the steps that telecommunication traffic data of a user are preprocessed so that free billing traffic data of the user are acquired; the free billing traffic data of the user are analyzed and calculated so that the traffic-free fraud suspected degree of the user is acquired; whether the user is a suspected traffic-free fraud user is analyzed and judged according to the traffic-free fraud suspected degree of the user; and whether the user is a traffic-free fraud user is analyzed and judged according to the traffic-free fraud suspected degree of the suspected traffic-free fraud user. According to the recognition method, malicious free billing traffic represented as a normal network protocol can be effectively and accurately screened out so that the traffic-free fraud user can be effectively and accurately recognized, and thus the problems of difficulty of recognition, interception and source tracing of current traffic billing flaws can be solved.

The invention provides a sampling method based on software frequency tracking. Non-full-period sampling is adopted, the deviation of the non-full-period sampling is decreased to be lower than a specified value, standard full-period sampling is achieved, and measurement accuracy of the non-full-period sampling is improved. The invention provides a broadband voltage / current calibration device and a broadband power / phase calibration device adopting the sampling method based on software frequency tracking. The broadband voltage / current calibration device comprises a broadband voltage / current source, a broadband resistance voltage / current divider, a sampling digital voltmeter, a signal generator and a computer, wherein the broadband voltage / current source is connected with the sampling digital voltmeter through the broadband resistance voltage / current divider, the output end of the signal generator is connected with an outer trigger port of the sampling digital voltmeter, and the computer is respectively connected with the signal generator, the sampling digital voltmeter and the broadband voltage / current source.

The invention relates to a stink fingerprint spectrum based stink pollution source tracing method. The method comprises the following steps: A, determining a suspected pollution source; B, discharging, sampling, analyzing the pollution source; C, sampling and analyzing an environment stink gas; D, screening a stink pollutant; E, constructing a pollution source and environment stink fingerprint spectrum; F, calculating the similarity through a source tracing mode; and G, identifying the pollution source according to the similarity. The stink fingerprint spectrum is constructed through the fingerprint spectrum technology and the odor threshold of a stink substance, the similarity coefficient of the pollution source and environment stink fingerprint spectrum is calculated by using an includedangle cosine method, so that the possible source of the stink pollution is judged, the source of the stink pollution is rapidly and accurately identified, the difficult problem of tracing the sourceof the stink pollution is solved, the technical defect of complaint management of the stink pollution is overcome, and the effectiveness and the authority in supervision and law enforcement of the stink pollution of the environmental management department are improved.

The invention relates to an agricultural material logistic anti-counterfeiting tracing system and method and belongs to the information service technology field. The system comprises an anti-counterfeiting label, an anti-counterfeiting reader, a server and a supplier card, wherein the anti-counterfeiting label is fixedly mounted at a sealing port of an agricultural material packaging bag, the anti-counterfeiting reader and the server realize network data transmission connection, the anti-counterfeiting reader reads the anti-counterfeiting label and the supplier card, and the supplier card is a portable information card. The system is advantaged in that the information industry and modern service industry technology is utilized, anti-counterfeiting and tracing problems of the agricultural material logistic field are solved, peasant households can be facilitated to simply and rapidly identify product authenticity, counterfeit control can be effectively carried out by enterprises, the government is facilitated to know about safe market operation conditions of agricultural materials, the agricultural material commodity information can be identified and traced, liability traceability can be realized, moreover, benefits of product manufacturers are taken as a core, logistics is taken as a main channel, real products can be guaranteed to smoothly arrive hands of consumers through various sale ways, and thereby peasant benefits are lastly guaranteed.

The invention provides a double-blade lever type barycenter measuring device and a measuring method thereof. The measuring device comprises a frame cover and a barycenter measuring instrument arranged in the frame cover, wherein the barycenter measuring instrument comprises a cross beam, a support blade, a working blade, a support pillar, a support beam and an assembling clamp, wherein the support pillar and the support beam are successively arranged under the cross beam; the upper end of the support blade is connected with the cross beam; the support blade is located on the middle parts of the support pillar and the support beam; the lower end of the support blade is connected with the bottom of the frame cover through a projection screen; a pointer is arranged under the support blade; the working blade and the assembling clamp are respectively arranged at the two ends of the cross beam; a scale is hung at the lower end of the working blade through a lifting lug; an electronic balance is jointed on the side of the projection screen, opposite to the scale. According to the measuring method, on the basis of a lever balancing principle, a standard block is selected for accurately measuring the plane of the barycenter of an irregular object, so that the mounting of the engine blade is benefited.

An alternating voltage-current converter comprises a standard capacitor and a meter amplifier, wherein the standard capacitor is set as an external connection type; the input bias current of the meter amplifier is less than 1pA, while the input impedance is more than 10<13> Ohm; the standard capacitor is connected with the meter amplifier through a fourwire access method. The fourwire access method is as follows: a capacitor end IH is used as an external voltage signal input end; a capacitor end VH is led to the positive input end of the meter amplifier; a capacitor end VL is connected with the negative input end of the meter amplifier; and a capacitor end IL is used as a signal output end. The alternating voltage-current converter adopts the standard capacitor to realize accurate conversion from alternating voltage to alternating current, and also provides a device and a method for realizing accurate verification of an AC small ammeter; moreover, the alternating voltage-current converter effectively solves the origin problem of AC low current.

The invention discloses a BIM data organization method based on a blockchain. The method comprises the steps that based on private chains, BIM data to be saved is recorded in a local storage medium through a central node, and blocks are uniformly packed into a block head every P time, wherein the process of uniformly packing the blocks into the block head comprises the following steps of recordingthe BIM data as BIM1, BIM2, ..., BIMn within the P time and recodrding the blocks as BIMDATA and composed of BIM1, BIM2, ..., BIMn, each BIMi comprises metadata, currently-modified BIM data and the access address of modified BIM data, and i is within the range of 1 to n; calculating a hash value BIMHASH of the blocks, wherein BIMHASH=Hash(BIM1||BIM2||...||BIMn); the data are packed into the blockhead BIMHEAD, wherein the block head BIMHEAD is composed of PreviousHash, BIMHASH, LinkofDATA, Timestamp and Signature. The BIM data organization method based on the blockchain can achieve the purposes of tracing and proofing BIM historical data and preventing the BIM historical data from being tampered and generate a unified format to support further open sharing.

The embodiment of the invention discloses a video security control method and device, equipment and a medium, and the method comprises the steps: responding to a video export request, and determining an export source identifier of a first target video, wherein the video exporting request is used for requesting to add a watermark to a first target video and exporting, the exported source identifier is generated by splicing a unique identifier of the terminal and a unique identifier distributed to a current login user on the terminal by the server; determining a watermark position dot matrix according to the pixel number of the first target video and the derived source identifier of the first target video, wherein the assignment of each point on the watermark position dot matrix is used for representing whether a watermark is added to a pixel position corresponding to the point; adding watermarks for the first target video based on the watermark position dot matrix in a mode of changing pixel values to obtain a first target video containing watermarks; and exporting the first target video containing the watermark. The method can effectively solve the video tracing problem, and ensures that the added watermark does not affect the visualization of the video content.

The invention discloses a method and a device used for determining the exception reason of data, and electronic equipment. The method used for determining the exception reason of the data comprises the following steps that: obtaining a sub-index which influences an exception main index to be analyzed; according to the practical data of each sub-index and the reference data of each sub-index, determining the exceptional sub-index; and according to the exception situation of the exceptional sub-index and a pre-generated corresponding relationship set of an exception situation and an analysis text template, generating the exception reason of the exception main index. When the method provided by the invention is adopted, an exceptional monitoring index can be automatically analyzed, and a possible exception reason is found so as to solve the problem of the traceability and the analysis of a business phenomenon.

The invention belongs to the technical field of calibrating of an apparatus, and discloses a method and a system for calibrating a laser beam analyzer. The structured parallel light field forms a flat top beam with a standard beam width through a diaphragm with a standard aperture; and the calibrated laser beam analyzer measures the beam width of the flat top beam, and compares the measured value with the light beam width standard value to achieve calibrating of the laser beam analyzer. The method and the system are effective and feasible, accurate and stable, and simple and convenient to operate; and the traceability issues of the measured beam width value of the laser beam analyzer are solved, and the calibrating accuracy is greatly improved.

The invention relates to an agricultural product circulation management system. The system comprises an agricultural product circulation management platform database, an agricultural product samplingdetection platform database, mobile terminal APPs for agricultural product wholesalers and retailers, and a third-party platform interface program for consumer mobile terminals; the mobile terminal APPs and the third-party platform interface program for consumers are connected with the agricultural product circulation management platform database and the agricultural product sampling detection platform database; the mobile terminal APP for the wholesalers is used for goods sale certificate issuance management; the mobile terminal APP for the retailers is used for goods sale certificate demanding management; and the third-party platform interface program for consumer mobile terminals is used for acquiring the information of the place of origin of purchased goods and inspecting the quarantine information of the purchased goods. With the agricultural product circulation management system provided by the technical schemes of the invention adopted, the problem of traceability in the circulation of agricultural products can be solved, so that certificate issuance and certificate demanding in a traditional food industry are more in line with traceability and safety in the circulation of agricultural products.

The invention discloses a high-sound pressure microphone-oriented amplitude- and frequency-adjustable calibrator with traceability and belongs to the field of high-sound pressure microphone calibration. The calibrator of the invention comprises a microphone installation structure, a microphone pre-tightening structure, a high-sound pressure absolute closed-loop real-time feedback measurement and control system and a vibration diaphragm system; the vibration diaphragm system includes a replaceable coupling cavity, a vibration diaphragm, and a driver; the replaceable coupling cavity generates uniform sound pressure within a wide frequency range; by means of the vibration of the vibration diaphragm, high sound pressure is generated in the closed coupling cavity; the driver converts electricalenergy into mechanical energy, so that a dynamic force can be generated to drive the vibration diaphragm to produce desired vibration, and high-magnitude-order sound pressure is excited in the air; the high-sound pressure absolute closed-loop real-time feedback measurement and control system controls the amplitude and frequency of the high sound pressure through the closed-loop feedback system according to the quantity value of the dynamic force or dynamic motion which is measured by a dynamic force sensor and an optical sensor, and therefore, it can be ensured that the high sound pressure can reach an expected frequency and amplitude, stable sound pressure output is realized, and the traceability of the sound pressure to fundamental quantities is realized.

The invention discloses an orthogonal reference phase verification method and device, and the specific verification method comprises the steps: 1, enabling a standard phase source to output orthogonal vector voltages U1 and U2 (nominal: 90 degrees or 270 degrees); 2, employing a phase sampling measurement system to measure the above orthogonal vector voltages U1 and U2: enabling a voltage channel 1 of the phase sampling measurement system to measure the vector voltage U1 and enabling a voltage channel 2 of the phase sampling measurement system to measure the voltage U2, wherein the phase difference between the vector voltages U1 and U2 measured by the phase sampling measurement system is shown in the description; 3, interchanging the voltage channels of the phase sampling measurement system, changing the measurement direction of the vector voltage U1, wherein the phase difference between U2 and U1 measured by the phase sampling measurement system is shown in the description; 4, calculating a quadrature phase error, setting a quadrature phase measurement error of the phase sampling measurement system as delta, setting the nominal orthogonal output phase error (shown in the description) of the standard phase source, and building two linear equations in two unknowns according to the above two phase errors (shown in the description), thereby calculating the quadrature phase error value delta and the nominal orthogonal output phase error (shown in the description).

The invention relates to artificial intelligence, the invention provides an atmospheric pollution source identification method and a device, computer equipment and a storage medium, and the method comprises the steps: obtaining various atmospheric pollution components of a plurality of pollution sources, constructing a pollution component matrix, and initializing a first target function as follows: the pollution component matrix = a pollution component contribution matrix * a pollution component content matrix + a residual matrix; calculating a pollution component contribution matrix and a pollution component content matrix according to the residual matrix when the residual matrix is iteratively calculated through a gradient descent algorithm to be smaller than a threshold value; calculating the mass concentration contributed by each pollution source according to the pollution component matrix and the pollution component content matrix so as to determine the source spectrum of each pollution source; and identifying the pollution source type corresponding to the source spectrum of each pollution source according to the mapping relationship between the source spectrum of the pollution source and the pollution source type. According to the invention, each source of the atmospheric pollution components can be accurately identified. In addition, the invention also relates to the blockchain technology, and the mapping relationship is stored in the blockchain.

The invention discloses a medical exercise treadmill calibration system and method. According to the invention, a medical exercise treadmill is composed of a computer with an electrocardiogram analysis system and an exercise treadmill; a medical exercise treadmill calibration device is composed of a speed measuring mechanical part and an instrument part; and external equipment comprises a notebook computer and a printer. The instrument part is mainly used for sensor signal acquisition of the speed measuring mechanical part, standard signal generation and common mode rejection ratio test. Upper computer software is mainly used for acquiring an output image of the computer, acquiring such parameters as waveform category, amplitude, frequency and the like through atlas analysis, comparing and contrasting the obtained parameters with standard signal parameter setting values so as to obtain relative errors of the various calibrated parameters, finally generating a calibration report and printing the calibration report. The calibration system and the calibration method disclosed by the invention can improve the accuracy of parameters of the medical exercise treadmill and reduce erroneous diagnosis and missed diagnosis on patients with coronary heart disease, so as to reduce safety hidden trouble on the patients with coronary heart disease to a certain degree.

The invention discloses a block chain data desensitization and traceability storage method and device. The method comprises the following steps: S1, receiving a data storage request which comprises sensitive data and an information association word corresponding to the sensitive data, and the sensitive data is data with access limits between nodes in a channel of a block chain; s2, according to the data storage request, sensitive data associated information associated words are stored and updated in private data corresponding to the nodes, and the private data are data with access permission set in the nodes; and S3, performing hash mapping on the sensitive data to obtain a hash value of this time, forming a modification record of this time by combining the information association word andthe hash value of this time with serialized data associated with the sensitive data, and storing a modification history record corresponding to the sensitive data updated in the private data. The method solves the desensitization problem of the blockchain data and the related traceability problem of the sensitive data, and has the technical characteristics of good privacy protection, traceabilityof the sensitive data and traceability of the modification record of the sensitive data.

The invention discloses an electro-acupuncture therapeutic instrument special-purpose calibration system and method; the electro-acupuncture therapeutic instrument special-purpose calibration system device comprises an electro-acupuncture therapeutic instrument special-purpose calibration unit and an external unit; the external unit comprises a laptop and a printer; the electro-acupuncture therapeutic instrument calibration unit mainly is used for acquiring output signals of the electro-acupuncture therapeutic instrument; host computer software is mainly used for acquiring output data of the electro-acupuncture therapeutic instrument calibration unit, carrying out error analysis and data integration for an output pulse voltage amplitude, the maximum output current effective value and an output continuous wave pulse frequency, an output lock, a DC component, a housing leakage current and a treatment time measured value, thus finally forming a calibration report and printing out same. The system and method can improve the electro-acupuncture therapeutic instrument parameter accuracy, can simplify a detection and calibration process, can reduce misdiagnosis and missed diagnosis of patients, and can reduce patient safety troubles in certain level.

The invention discloses a network time server calibration method based on satellite common view, which comprises the following steps of: firstly, remotely tracing a local clock to a national time frequency measurement reference by utilizing satellite common view, and then remotely accessing a network time server to be tested by taking the local clock as a reference and a client of network time service, time service precision of the network time server is measured through time service methods of different network time servers, and calibration is carried out. The invention also discloses a network time server calibration device based on satellite common view, which remotely traces to the national standard time through satellite common view and directly or remotely calibrates the network timeserver. According to the invention, remote calibration of the network time server is realized based on remote tracing of satellite common-view time, the problems of high precision, remote tracing andremote calibration of the network time server are solved, the structure is simple, the action effect is remarkable, and the method is suitable for wide popularization.

The invention relates to a source device and method for an AC micro-current, which solves the source problem of AC micro-current from 1mA to 10 [Mu]A (50Hz to 10kHz), and the measurement uncertainty reaches the order of 10[-5] to 10[-4]. The device includes an equivalent AC resistor-AC micro-current calibrator formed by a combination of a low noise wide-band amplifier and an AC resistive shunt. The measured AC micro-current is passed into the AC micro-current calibrator. The output voltage of the AC micro-current calibrator is measured by a high-accuracy AC voltmeter. The magnitude of the measured AC micro-current is obtained by converting the ratio of the measured voltage value to the equivalent AC resistance. The AC resistive shunt is calibrated by a calculable resistor. The low noise wide-band amplifier is verified by a magnification verification device. The AC voltmeter is calibrated by an AC standard voltage source.

The invention provides a full-range calibration device and method of high voltage nanosecond pulse voltage divider calibration factors to reduce the measurement deviation of nanosecond pulse voltage in a pulse power technology. According to the full-range calibration device and method, the characteristic that the calibration coefficient of a nanosecond pulse electric field measuring probe can be calibrated by devices such as a GTEM cell or a TEM cell in a large amplitude range is utilized, by correlating the nanosecond pulse voltage and the nanosecond pulse electric field, the present situation of a nanosecond pulse voltage non-standard measurement system under a high-voltage level is skillfully avoided, the calibration of the calibration coefficient of the nanosecond pulse divider under hundreds of kilovolts voltage level is achieved, and the traceability problem of hundreds of kilovolts voltage measurement in the pulse power technology is solved.

The invention relates to a device for measuring the position of a metal bar in a transparent material based on the image recognition principle. The device is able to inspect an inspection component of a concrete reinforcement detector based on the electromagnetic sensing principle. The device comprises an operation system and an auxiliary system during manufacturing. The operation system is manufactured by the steps of a) operation platform bracket, namely, a VIS vibration isolation type optical platform bracket to keep the top horizontal; b) optical flat plate prepared from aluminum alloy material; c) grating ruler, namely, a noncontact grating measuring system of which the precision is up to 1 micron; d) slide rail, namely, general electric control translation platform; e) connecting plate for connecting a load plate of the general electric control translation platform and a reading head of the grating ruler a well as being used as a new loading platform; f) fixing inspection component standard part, namely, designing M6 threaded holes in two ends of the connecting plate according to the size of the testing part, and fixing the part on the new loading platform through a cap; h) parallel light source, namely, providing an LED light source. The auxiliary system mainly comprises a stereoscopic microscope, an industrial camera, image processing software and a computer.

The invention provides a Bitcoin hidden service node transaction tracing method. The Bitcoin hidden service node transaction tracing method comprises the following steps: S1, position tracing of Bitcoin hidden service node: establishing a hidden channel between a controlled guard node and a collusion Bitcoin monitoring node by using a Bitcoin heartbeat mechanism, and designing a signal coding mode, so that position tracing of the hidden Bitcoin node is realized; and S2, transaction tracing of the Bitcoin hidden service node: controlling a delay strategy of transaction receiving and forwarding of the hidden Bitcoin node at the controlled guard node to realize the transaction tracing of the hidden Bitcoin node. According to the Bitcoin hidden service node transaction tracing method provided by the invention, the new Bitcoin transaction tracing method can identify transactions created by a target Bitcoin hidden service node with relatively high accuracy and recall rate, so that a new tracing problem caused by supporting Tor by Bitcoin is solved to a certain extent, and it is proved that the Tor network cannot well protect the privacy of Bitcoin users.

The present invention relates to a method for carrying out source tracing on a white spirit from a finished product to a semi-finished product, and belongs to the field of white spirit production. The present invention aims to solve the technical problem of providing the method for carrying out source tracing on the white spirit from the finished product to the semi-finished product. Information of the white spirit is recorded through a combination of a fixed ID number and a varied FD number and when the white spirit is put in / out of a wine jar, the ID number is unchanged and the FD number, according to an actual situation of the white spirit in the wine jar, is changed so as to trace and record basic information and flow transfer information of the white spirit, thereby enabling sources of components of the white spirit to be recorded clearly, tracing the source of the white spirit from the finished product to the semi-finished product and solving the difficult problem of tracing the sources of the components of finished product white spirit, which puzzles each white spirit manufacturing enterprise for a long time.

The invention discloses a seal generation and verification method supporting subject and content authentication. The method comprises a seal generation stage and a seal verification stage. In the seal generation stage, a data owner uploads a file to a seal signing and issuing system, a shared file is generated through the seal signing and issuing system, a seal is generated and embedded into the shared file, and the shared file is encrypted and stored in a system server. In the seal verification stage, after logging in, the data user authorizes to use the private key of the data user, the seal issuing system uses the private key to decrypt the shared file for the data user to check, and the data user can request to obtain a file verification result and a traceability result. According to the method disclosed by the invention, high-strength security indexes such as non-tampering of the signature file content and non-imitation of the seal impression are realized by applying a digital signature technology and a block chain technology, so that the signature file has uniqueness, and illegal behaviors such as file counterfeiting and the like are avoided to the greatest extent.

The invention relates to a distortion and pulsation signal testing method for a direct-current 270V power supply system of an airplane, and belongs to the technical field of airplane power supply characteristic testing and calibration. The method is mainly used for realizing accurate measurement of distortion and pulsation signals of the airplane DC 270V power supply system, and tracing the distortion frequency spectrum and the pulsation voltage amplitude in characteristic parameters of the airplane DC 270V power supply to basic quantities. According to the invention, distortion and pulsation signals which are measured and superposed on direct current 270V and high-stability direct current 270V reference signals are subtracted by a subtraction circuit formed by a high-voltage linear amplifier, so that smaller distortion and pulsation signals are obtained; the signal meets the input range of the A / D converter with positive and negative signal measurement; meanwhile, by calibrating high-stability direct-current reference signals and amplitude-frequency characteristics of a subtraction circuit, distortion and pulse values obtained through measurement are compensated and corrected.

The invention provides a four-terminal resistor and a method for measuring the time constant of the four-terminal resistor, belonging to the field of resistance measurement standards. The four-terminal resistor adopts a coaxial bracing wire structure and comprises an outer shell (3), a resistance wire (7), a central rod (6), a shunt disc (5) and an afflux disc (4), wherein the resistance wire (7), the central rod (6), the shunt disc (5) and the afflux disc (4) are installed in the outer shell (3). According to the method, the resistance wire with a low resistivity is adopted to replace the resistance wire with a high resistivity in the four-terminal resistor to form a four-terminal resistor RC with the low resistivity; the four-terminal resistor RC with the low resistivity and a four-terminal mutual inductor M are mutually replaced to realize measurement to the inductance value L of the four-terminal resistor; and the capacitance value C of the four-terminal resistor is obtained through measuring the capacitance of the four-terminal resistor RC with the low resistivity in which a current loop is disconnected. According to the four-terminal resistor and the method, the traceability problem of angle difference measurement of the four-terminal resistor in the alternating-current electric quantity measurement process is solved.