38results about How to "Avoid manual measurement errors" patented technology

The invention relates to a system for detecting the connectivity of a bank cable and a method thereof. In the system, a primary test end carries out detection through a tested cable together with a secondary test end; the primary test end and the secondary test end respectively comprises a voltage comparator, a test resistor and a singlechip; the singlechip at the primary end is connected to one end of one core wire of the cable through the test resistor, and the other end of the core wire is connected to the singlechip of the secondary end through the test resistor; the ends which are connected with the core wire of the cable, of the test resistances of the primary end and the secondary end are respectively connected with one voltage comparator; the output end of each voltage comparator is connected to the singlechip; when in test, the singlechip at the primary end respectively outputs high level to one core wire of the tested cable and low level to the other core wires of the tested cable, the current passes through the tested resistance, the voltage comparator of each core wire compares the detected voltage value with the reference voltage to obtain a logical result, the logical result is respectively input to the singlechips at the primary end and the secondary end and is comprehensively analyzed so as to judge whether each core wire is in a normal state, a disconnection state, a misconnection state, a state of short-circuit with the ground or a state of short-circuit between conductors.

A penaeus orientalis measurement system disclosed by the present invention comprises an operating bench, a camera is arranged on the operating bench and is in signal connection with a computer, and the image data obtained by the camera is transmitted to the computer. The operating bench is also equipped with a transparent water tank, the transparent water tank is fixed on the operating bench detachably, and a measurement software is loaded in the computer and comprises a data reception module for receiving the image information transmitted by the camera; a manual module used for manually intercepting the information of the sites in a shot picture; a data processing module used for calculating the distances between the sites intercepted by the manual module and obtaining the penaeus orientalis measurement data; and a data storage module used for storing the data processed by the data processing module. The penaeus orientalis measurement system and the measurement method thereof can reduce the damage of the artificial measurement to the shrimps furthest, are high in measurement precision, and can avoid the errors caused by the artificial measurement.

The invention discloses an experimental device for measuring rock permeability and a method thereof. The device comprises a tube (1), a thermostatic water bath (2), a ring crush (3), a core holder (4), an oil holder (5), a water container (6), a six-way valve, a high pressure nitrogen steel bottle (8), a photoelectric interrupter (9), an optical fiber tube (10), a single chip and a monitor. The photoelectric interrupter is arranged in a certain equidistant and is connected with the single chip which is connected with the monitor. In the measuring method, the flow speed of liquid is calculated by time of the liquid passing the equidistant photoelectric interrupter, thus obtaining the permeability of the rock. The invention has the advantages of high precision, fast testing speed, and easy operation.

The invention discloses a rock sample double-end surface grinder. The rock sample double-end surface grinder comprises a base, frames, electrical cabinets and a clamping bench. The base is rectangular and is arranged at the bottom of the rock sample double-end surface grinder. The two frames are movably connected to the base through driving elements, are respectively located at left and right ends of the base and are perpendicular to the base. The two electrical cabinets are respectively arranged at left and right sides of the upper parts of the two frames. Two ends of the inner sides of the two electrical cabinets are respectively and symmetrically provided with two circular polishing discs. The clamping bench is slidingly connected to the base through a sliding rail installed above the base. The sliding rail is located at the axisymmetric center of the base. A rock sample is polished simultaneously through double end surfaces so that artificial measurement-caused errors are avoided and repeated processes of rock sample loading and unloading and time waste are avoided. The rock sample double-end surface grinder has the advantages of high polishing efficiency, accurate and reliable length control and operation convenience.

The invention relates to a power supply assembly debugging device of photodetection equipment, which comprises an industrial control machine, an electronic load, a charging control circuit, a three-phase 115V open-phase and phase sequence detection circuit, and a detection signal processing and front panel displaying circuit, wherein the industrial control machine is respectively connected with 13 voltage switching circuits and the charging control circuit by a data acquisition card and a digital I / O (input / output) card, and the detection signal processing and front panel displaying circuit is respectively connected with the industrial control machine, a detection signal input interface and a three-phase 115V open-phase and phase sequence detection and display processing circuit. The power supply assembly debugging device sends power supply charging / discharging signal to a power supply assembly, so that the working condition of 13 paths of voltage of the power supply assembly under idler and loading conditions can be detected; the power supply assembly debugging device can work in a manual or automatic inspection state to automatically finish self-checking and detection and distinguishing of the 13 paths of output voltage of the power supply assembly, and manual intervention is not needed, so that the labor intensity is reduced and the detection efficiency is improved; and the device has good stability and high reliability.

The invention discloses a method and a device which are used for detecting water body transparency. According to the method, penetration of water boy by light sources is realized at three different positions of a water area to be detected, the light power at the three positions is detected, and water body transparency L is determined based on formula 1. The device comprises a sealed chamber, a data acquisition module, a data analysis module, a control module, and a power supply. Compared with the prior art, the method possesses following advantages: light intensity difference collected by a light intensity receiver is taken as the transparent degree L of the water body, the automatic degree is higher than that of transparent scale method, error caused by artificial measuring is avoided. Inthe method, differential method is adopted to measure water body transparency for the first time, and generation of external interference and accumulated error is eliminated from principles; the suitable range is wide; the device can be used at water areas impossible for artificial measuring such as high density and automatic collection at water towers or in the wild; measuring cost is reduced greatly; a large amount of data sample is obtained; and real-time detection is realized.

The invention discloses an image calibration device and method for a mark on a printed board, the image calibration device for the mark on the printed board comprises a board feeding unit, a main camera unit, an auxiliary camera unit and a control system, and the image calibration method for the mark on the printed board comprises the following steps: fixing and conveying the printed board by the board feeding unit; the auxiliary camera unit preliminarily shoots a printing plate image, uploads the image to a control system display screen, clicks to determine an image where the mark position is located, then the main camera unit converts the determined position image of the mark into a view, fine adjustment of mark coordinates is carried out, and after the mark position is fine adjusted, clicks, stores and establishes coordinate parameters of the mark, and the mark is calibrated; and then the control system controls the main camera unit to be converted into a view mode, the mark on the printed board is calibrated or scanned and recognized, and the calibration, calibration or detection work of the mark can be completed after calibration or scanning is completed. The calibration method is irrelevant to the shape of the printed board, and the mark calibration is more accurate and rapid.

The invention discloses an automatic water-supplementing evaporating dish device which comprises an evaporating dish and an automatic water supplementing device, wherein the automatic water supplementing device comprises a Markov bottle and a balancer connected between the evaporating dish and the Markov bottle; the Markov bottle and the balancer are communicated by virtue of a communicating pipe II; a valve II is arranged on the communicating pipe II; the balancer and the evaporating dish are communicated by virtue of a communicating pipe I; a valve I is arranged on the communicating pipe I; a water inlet pipe is arranged at the bottom of the Markov bottle; a valve III is arranged on the water inlet pipe; an air inlet pipe and an air outlet pipe are arranged on the top of the Markov bottle; a valve IV is arranged on the air outlet pipe; scales are marked on the Markov bottle and are used for measuring the water level; and an overflow cylinder is externally connected to the balancer. According to the device disclosed by the invention, the automatic water supplementing function of an E601 type evaporating dish is realized, so that the initial water level in the evaporating dish is kept constant, an overflow hole in the evaporating dish is replaced by using the balancer, the evaporation capacity is read by virtue of the scales marked on the Markov bottle body, measurement of overflow quantity during rainfall is avoided, and the automatic water supplementing function is realized.

The invention provides a device for measuring a ramp breakover angle of an automobile and a measuring method thereof. The device for measuring the ramp breakover angle of the automobile comprises a mounting plate, a first lower base plate, a second lower base plate, a height measuring plate and a data analysis and acquisition system, wherein the first lower base plate and the second lower base plate are located on the same plane, the mounting plate comprises a first end face and a second end face which are opposite, a sliding groove penetrating through the first end face and the second end face is formed in the mounting plate, the first lower base plate and the second lower base plate are respectively inserted into the sliding groove through the first end face and the second end face in a slidable mode, the height measuring plate is vertically mounted on the third end face of the mounting plate, and the data analysis and acquisition system calculates the ramp breakover angle according to measurement results of ultrasonic range sensors arranged on the end faces, away from the mounting plate, of the first lower base plate, the second lower base plate and the height measuring plate respectively. The device for measuring the ramp breakover angle of the automobile is simple in structure and convenient to operate, and the accuracy of the measured ramp breakover angle of the automobile is higher.

The invention discloses a heat exchanger fin detection apparatus comprising a positioning rack used for supporting the heat exchanger, a transmission mechanism which is arranged along the length direction of the positioning rack, a detection probe moving along the transmission mechanism, a first processor which is in communication connection with the detection probe, and a feed-back device which is in communication connection with the first processor, wherein the length direction of the positioning rack is an arrangement direction of fins of the heat exchanger arranged on the positioning rack, the first processor is used for receiving an interval value of the heat exchanger and is used for comparing the interval value with a preset interval, and the feed-back deice is used for feeding back comparison information. According to the heat exchanger fin detection apparatus provided by the invention, manual measurement errors can be prevented, accuracy of fin interval detection can be effectively improved, the fin interval is detected by the heat exchanger fin detection apparatus, manual measurement and conversion can be prevented, labor intensity of manual detection can be greatly lowered, and detection efficiency can be improved.

The invention discloses an automobile wire harness assembly platform, which comprises a base, a motor is arranged inside the base, a roller is sleeved on the motor main shaft, a conveyor belt is sleeved on the outside of the roller, a control switch for controlling the motor is arranged on the base, and a plurality of A toolbox and two poles, a panel is arranged between the poles, cross scale lines are arranged on the surface of the panel, internal thread holes are provided at the intersection points of the scale lines, connecting rods with external threads are provided on both sides of the panel, and the connecting rods are connected There are hexagonal nuts on the rod, multiple fixing seats on the panel, screw rods on the bottom of the fixing seats and threaded connections with the internal thread holes, locks on both sides of the fixing seats, multiple clamping devices and Wire routing device, this invention can directly measure the distance according to the scale line, avoid manual measurement errors, improve processing efficiency, and is suitable for assembly and arrangement of different types of wire harnesses.

The invention relates to a device for monitoring lateral displacement of soil in situ and a using method of the device, and belongs to the field of geotechnical engineering. The device for monitoringthe lateral displacement of soil in situ comprises a static penetration machine, a sleeve, a steel strip adhered with a fiber grating and a probe, wherein the probe is pressed and contacted at the bottom end of the sleeve, the probe is fixedly connected with the steel belt, and the static penetration machine drives the sleeve to move into a soil body through a built-in driving part, so as to enable the probe and the steel belt to be pressed into the soil to a predetermined depth; the sleeve is pulled out by the static penetration machine, the steel belt adhered with the fiber grating remainingin the soil body deforms together with the soil body, and the fiber grating measures and outputs the deformation amount, so that the purpose of monitoring the lateral displacement of the soil body isrealized. The fiber grating in the device has small volume, plastic geometric shape and strong electromagnetic interference resistance; with the deformation of soil, the steel strip can be automatically monitored in real time and warned in time; the static penetration machine does not need pre-drilling, the equipment is simple and the operation is convenient; and meanwhile, the device has the advantages that the precision is high and manual measurement errors can be avoided.

The invention discloses a laser ranging module-based foundation settlement automatic monitoring device. The device comprises an over-ground part and an underground part; the underground part comprisesa steel pipe pile, a laser ranging module and a settlement disk, wherein the steel pipe pile is driven into and stabilized in a foundation; the over-ground part comprises a wireless data acquisitionmodule and a data processing terminal; a device installation groove is excavated in the upper part of the foundation around the steel pipe pile; the sedimentation disk is horizontally arranged at thebottom of the device installation groove; the laser ranging module is vertically arranged above the sedimentation disk; the laser ranging module is vertically fixed on one side of the steel pipe pilethrough a bracket; the bracket and the laser ranging module are installed in the device installation groove; and the laser ranging module is provided with a laser range finder, a communication module,a flash memory card and a battery pack, wherein the laser range finder is located at the bottommost portion of the laser ranging module. With the laser ranging module-based foundation settlement automatic monitoring device of the invention adopted, the settlement of the foundation can be automatically monitored, manual field measurement is not required, manual measurement error can be avoided, data are accurate and reliable, monitoring costs are low, and the specific analysis of the settlement data of the foundation is facilitated.

The invention discloses an automatic measuring method for percentage elongation after single-shaft tensile fracture of a metal round bar sample and belongs to the technical field of mechanical property test of metal materials. According to the method, on the premise that the elasticity modulus and the poisson ratio of a material are known, only gauge length elongation and a load value at the tensile fracture moment of the round bar sample need to be measured and recorded, meanwhile, an optical method is adopted to collect the outer contour curve of the round bar sample after fracture, and thepercentage elongation after single-shaft tensile fracture of the metal round bar sample is obtained through elastic deformation analysis and calculation. According to the method, the elastic part is accurately deducted, without the need of identifying the fracture position in the gauge length range, a shifting method is automatically implemented, so that the percentage elongation after fracture isaccurately obtained. Compared with the existing manual measurement technology, tedious measurement links such as scribing and fixing the fracture sample are omitted, the measurement precision is improved, and great significance is achieved for mechanical property test of the metal material.

The invention discloses a living body continuous measurement method of morphological traits of cold water roes or fry, relates to the field of living body continuous measurement methods of the roes or the fry and aims to overcome the defects that measurement errors are large, the roes or the fry are / is prone to deform and die, and the difficulty is high in the continuous measurement study process in terms of existing measurement methods of the roes or the fry. The method includes that (1) a measuring tank is prepared and water is filled in the measuring tank; (2) the roes or the fry are / is transferred into the measuring tank; (3) the roes or the fry are / is subjected to image acquisition; (4) the roes or the fry are / is put back; and (5) image data are subjected to analysis and measurement by software, calculation is performed by means of a scaling formula to obtain actual morphological data of the roes or the fry, and namely the living body continuous measurement of the morphological traits of the cold water roes or fry is completed. The method is suitable for the field of cold water fish breeding industries.

The invention discloses a non-contact two-dimensional gantry measurement workstation, which comprises a lathe bed, a large portal frame, a small portal frame, a non-contact measurement device, a drive device and a controller, wherein the large portal frame is arranged on the lathe bed; the small portal frame is arranged on the large portal frame; the non-contact measurement device is connected with the small portal frame; the drive device is connected with the large and small portal frames; and the controller is connected with the lathe bed, the large portal frame, the small portal frame, the non-contact measurement device and the drive device respectively. The non-contact two-dimensional gantry measurement workstation adopts non-contact measurement and a gantry structure, avoids the occurrence of manual measurement errors, greatly improves the measurement accuracy, accelerates the measurement, improves the measurement working efficiency and simplifies a measurement process.

The embodiment of the invention provides a wireless charging test device and method, and relates to the field of wireless charging test. The wireless charging automatic test device comprises a base, atest platform, a conveying assembly, a receiving end clamp and a control module. The test platform is arranged on the base and is used for placing a wireless charger; the receiving end clamp is installed on the conveying assembly and used for clamping a wireless charging receiver; the conveying assembly is installed on the base and used for driving the receiving end clamp to move to a set position; the control module is used for detecting the input power and the standby power of a wireless charging transmitter and the input power of the wireless charging receiver, and is used for judging whether the wireless charger is normal or not. According to the wireless charging test device and method, one or more transmitting ends of the wireless charger can be automatically tested, manual measurement errors are avoided, and the workload of test personnel is reduced; and the detection quality can be guaranteed, and the detection result is high in reliability.

The invention provides an SIR testing system, comprising a control box; a programmable high voltage power supply in connection with the control box to provide power supply to the control box; an industrial personal computer in connection with the programmable high voltage power supply to control the programmable high voltage power supply; a programmable switch in connection with the control box to realize the switching among a plurality of testing channels; a switchboard connected with the control box, the industrial personal computer and the programmable switch respectively to provide a signal channel; an externally provided box in connection with the programmable switch; an environmental test chamber in connection with the industrial personal computer and an ammeter in connection with the control box to measure. Compared with the prior art, the testing system of the invention has the following advantages: 1) simplifying repetitive testing procedures; 2) avoiding errors of manual measurement; and 3) conducting more advanced data analysis.

The present disclosure relates to a stirring rod rotation speed monitoring device and method. The device includes a sensing component (6) mounted on a stirring rod (4), and a plurality of monitors (7), wherein the monitors are circumferentially distributed around the stirring rod (4) with angles formed between the monitors; the sensing component (6) can sequentially pass through the monitoring areas of the plurality of monitors (7) as the stirring rod (4) rotates; each monitor (7) can generate sensing signals when the sensing component (6) passes through the monitoring area of the monitor (7);the monitors (7) are electrically connected with a controller; and the controller is used for determining the actual rotational speed of the stirring rod (4) according to the sensing signals generated by the plurality of monitors (7). With the stirring rod rotation speed monitoring device and method of the invention adopted, the problems of influence on the quality of products brought about by the inaccurate rotation speed measurement of a stirring rod which is further caused by mechanical problems and manual measurement can be decreased in the stirring section of a platinum channel.

The invention discloses an automatic measurement method for the elongation rate of a metal plate sample after uniaxial tension, which belongs to the field of mechanical properties of metal materials. The method only needs to be measured and tested under the premise of known material elastic modulus and Poisson's ratio Record the gauge length elongation and load value at the moment of tensile fracture of the plate sample, and at the same time use optical methods to collect the distribution information of the outer contour of the plate sample in width and thickness, and obtain the uniaxial tension of the plate sample through elastic deformation analysis and calculation elongation after break. This method accurately deducts the elastic part, and automatically implements the displacement method without identifying the fracture position within the gauge length range, so as to accurately obtain the elongation after fracture. Compared with the existing manual measurement technology, it saves the cumbersome measurement links such as scribing and fixing the broken sample, and improves the measurement accuracy, which is of great significance for the mechanical performance test of metal materials.

The invention discloses a chloride ion detector and a chloride ion detection method, and relates to the field of water quality detection equipment, the chloride ion detector comprises a sampling tank, a communication device, a titration cell, a liquid dropping mechanism, a solution storage device, a water supply device, a reagent supply device and a controller; the reagent supply device is used for containing related reagents; the sampling tank is used for acquiring and outputting liquid; the titration cell is communicated with a liquid dropping mechanism, the liquid dropping mechanism is used for dropping a titration solution into the titration cell, and a titration monitoring device is arranged on the outer side of the titration cell; the communicating device is connected with the sampling tank, the titration cell, the water supply device, the solution storage device and the reagent supply device; the controller is electrically connected with the sampling tank, the communicating device, the titration cell and the liquid dropping mechanism, and the controller is used for respectively controlling the connection and disconnection of the sampling tank, the titration cell, the solution storage device and the reagent supply device with the communicating device. According to the chloride ion detector and the chloride ion detection method, the concentration of a high-concentration chloride ion solution can be detected, and the detection precision and the detection efficiency are improved.

The invention discloses a method for improving the physical dimension precision of the pipe body and pipe ends of a longitudinally welded pipe. The method comprises the steps that modular subdivisioncontrol is adopted during mechanical diameter expanding, different diameter expanding rates are adopted for the pipe ends and the pipe body, the diameter expanding length of each subsection is about 2.5-3.0 m during pipe body diameter expanding, it is guaranteed that the overlapping amount of last and next subsection diameter expanding is larger than 0.5 m, and the straightness deviation of the steel pipe within the overall length range is optimally controlled to be smaller than or equal to 0.15% of the pipe length. According to the method, different diameter expanding rates are adopted according to the diameter expanding requirements of different positions, difference control over the physical dimension of the pipe ends and the pipe body can be achieved, and the diameter expanding effectand quality of the whole pipe are guaranteed.

The invention relates to the related field of gears, and discloses a gear repairing device capable of achieving automatic repairing according to shapes. The gear repairing device comprises a base box body, a conveyor belt cavity is arranged in the base box body, the lower side of the conveyor belt cavity is provided with a tightening block cavity in a communicating manner, a tightening block is connected in the tightening block cavity in a sliding fit manner, a tightening spring is fixedly connected between the lower end face of the tightening block and the lower end wall of the tightening block cavity, and a control electromagnet capable of corresponding to the tightening block is fixedly connected in the lower end wall of the tightening block cavity. Through cooperation between a spring pull rope and the magnet, the effect that to-be-repaired tooth surfaces and complete tooth surfaces are basically kept consistent by repairing to-be-repaired parts according to the different tooth shapes of all gears is achieved, manual measurement errors caused by manual repairing are avoided, wear caused during gear engagement in the subsequent using process is further avoided, meanwhile, operation is simple, and the cost is lower than that of manual repairing.

The invention provides an SIR testing system, comprising a control box; a programmable high voltage power supply in connection with the control box to provide power supply to the control box; an industrial personal computer in connection with the programmable high voltage power supply to control the programmable high voltage power supply; a programmable switch in connection with the control box to realize the switching among a plurality of testing channels; a switchboard connected with the control box, the industrial personal computer and the programmable switch respectively to provide a signal channel; an externally provided box in connection with the programmable switch; an environmental test chamber in connection with the industrial personal computer and an ammeter in connection with the control box to measure. Compared with the prior art, the testing system of the invention has the following advantages: 1) simplifying repetitive testing procedures; 2) avoiding errors of manual measurement; and 3) conducting more advanced data analysis.

The invention relates to a system for automatically measuring the length of a drilling tool, which includes a base and a drilling tool transfer device on the base. The upper surface of the drilling tool transfer device has a V-shaped groove for placing the drilling tool. Small trolley, the front end of the small trolley is fixed with a reflective measurement plate, and the rear end of the base is equipped with a laser ranging head for emitting laser beams forward. There is a photoelectric sensor, the light beam of the photoelectric sensor is located above the V-shaped groove and perpendicular to the V-shaped groove, the laser distance measuring head and the photoelectric sensor are connected to a controller, and the controller controls the connection of the small pulley. The invention also provides a method for automatically measuring the length of the drilling tool. The solution solves the problem of low efficiency in measuring the length of the drilling tool by means of the prior art.

The invention discloses a measuring device for a parameter of a metal plate hole, relating to the technical field of measurement and being invented to measure the parameter of the metal plate hole precisely. The measuring device for the parameter of the metal plate hole comprises a limiting base, a slide block, a measuring head and a displacement sensor, wherein the limiting base is internally provided with a first hole and a second hole, both of which are mutually connected and coaxial; the aperture of the first hole is greater than that of the second hole; a lug boss which is contained in the first hole is arranged at the sidewall of the top part of the slide block; the sidewall below the lug boss of the slide block is matched with the inner wall of the second hole in a sliding manner; the measuring head with a round cross section is fixed at the bottom of the slide block; the intersecting line of the lengthways section of the measuring head and the side surface of the measuring head is a beeline; the included angle between the intersecting line and the bottom of the measuring head is less than or equal to 90 degrees, but grater than 0 degree; ad the displacement sensor is used for detecting the displacement of the slide block from a starting position to a measured position. The measuring device for the parameter of the metal plate hole, disclosed by the invention, is used for measuring the parameter of the metal plate hole.

The invention discloses an experimental device for measuring rock permeability and a method thereof. The device comprises a tube (1), a thermostatic water bath (2), a ring crush (3), a core holder (4), an oil holder (5), a water container (6), a six-way valve, a high pressure nitrogen steel bottle (8), a photoelectric interrupter (9), an optical fiber tube (10), a single chip and a monitor. The photoelectric interrupter is arranged in a certain equidistant and is connected with the single chip which is connected with the monitor. In the measuring method, the flow speed of liquid is calculatedby time of the liquid passing the equidistant photoelectric interrupter, thus obtaining the permeability of the rock. The invention has the advantages of high precision, fast testing speed, and easy operation.

The invention discloses a calcium hardness detector and a calcium hardness detection method, and relates to the field of water quality detection, wherein the calcium hardness detector comprises a sampling tank, a communication device, a titration cell, a liquid dropping mechanism, a reagent supply device and a controller; the reagent supply device is used for containing reagents required by detection; the sampling tank is used for metering, acquiring and outputting liquid; the titration cell is communicated with the liquid dropping mechanism, a titration monitoring device is arranged on the outer side of the titration cell, the titration monitoring device is used for monitoring the reaction degree of a solution in the titration cell and comprises a light source and a light sensing device, and the light sensing device is not directly irradiated by light of the light source; the communicating device is connected with the sampling tank, the titration cell and the reagent supply device; and the controller is electrically connected with the sampling tank, the communicating device, the titration cell and the liquid dropping mechanism, and the controller is used for respectively controlling the on-off of the sampling tank, the titration cell, the reagent supply device and the communicating device. According to the calcium hardness detector and the calcium hardness detection method, the calcium hardness detection precision can be improved, and the detection efficiency is improved.

The invention relates to a system for detecting the connectivity of a bank cable and a method thereof. In the system, a primary test end carries out detection through a tested cable together with a secondary test end; the primary test end and the secondary test end respectively comprises a voltage comparator, a test resistor and a singlechip; the singlechip at the primary end is connected to one end of one core wire of the cable through the test resistor, and the other end of the core wire is connected to the singlechip of the secondary end through the test resistor; the ends which are connected with the core wire of the cable, of the test resistances of the primary end and the secondary end are respectively connected with one voltage comparator; the output end of each voltage comparator is connected to the singlechip; when in test, the singlechip at the primary end respectively outputs high level to one core wire of the tested cable and low level to the other core wires of the testedcable, the current passes through the tested resistance, the voltage comparator of each core wire compares the detected voltage value with the reference voltage to obtain a logical result, the logical result is respectively input to the singlechips at the primary end and the secondary end and is comprehensively analyzed so as to judge whether each core wire is in a normal state, a disconnection state, a misconnection state, a state of short-circuit with the ground or a state of short-circuit between conductors.