328results about "Multi-tester circuits" patented technology

The invention relates to an anti-electricity-stealing monitoring method and device based on an intelligent universal meter, equipment and a medium. The method comprises the following steps: acquiring real-time electric sampling data of a universal meter, and preprocessing the data to obtain electric characteristic data; carrying out electricity stealing feature extraction on the electricity feature data by utilizing an edge electricity stealing detection model, and carrying out preliminary judgment on an electricity utilization type to obtain a preliminary judgment result; if the preliminary judgment result is at least one of an electricity larceny event and reverse feed, using a cloud electricity larceny detection model to perform secondary analysis on the electricity characteristic data to obtain an abnormal probability; and if the abnormal probability exceeds a preset threshold, generating a corresponding alarm work order, and pushing the alarm work order to a supervision platform. By adopting the method, the field acquisition capability of the intelligent multimeter can be fully combined, the local and cloud computing characteristics are combined, and the recognition and monitoring of electricity stealing behaviors such as low-current electricity stealing and reverse feed are effectively enhanced through a multi-source feature extraction and judgment mechanism.

The invention relates to the technical field of emergency equipment, in particular to an emergency equipment intelligent management terminal power adapter which comprises an adapter body. The plug is arranged on the adapter main body; the socket is connected with the plug; the intelligent management terminal is connected with the adapter main body; the intelligent management terminal can detect the electric power information of the socket. According to the invention, power can be supplied to the digital management terminal of the generator, efficient and reliable power supply adaptation is realized, the output voltage and current of the generator are acquired, and the stable power supply requirement of the intelligent management terminal of the emergency equipment in an application scene of adapting to a small movable generator is met.

The invention discloses a high-voltage direct-current line EM lightning arrester valve plate shunting non-uniformity test system and method, and belongs to the technical field of lightning arrester performance test.The method comprises the steps that S1, a high-voltage direct-current power transmission system simulation model is established, and the discharge current of an EM lightning arrester under the severe working condition of single-pole line short circuit is evaluated based on the high-voltage direct-current power transmission system simulation model; adopting square-wave pulse approximate discharge current, and determining the total amplitude and square-wave pulse width of long-wave discharge current of the EM lightning arrester; s2, applying the square wave pulse to the tested EM lightning arrester resistor discs through a shock wave test platform, and testing the current magnitude and the total current of each resistor disc of the EM lightning arrester under the working condition; the total amplitude and the square wave pulse width of the preset square wave pulse are the same as the total amplitude and the square wave pulse width of the long wave of the discharge current of the EM arrester; and S3, according to the current of each resistor disc and the total current, calculating a current non-uniform coefficient and the current range of the resistor discs. According to the invention, the current distribution non-uniformity of the multi-column parallel lightning arrester can be tested and evaluated more reasonably and comprehensively.

The invention provides an AC solid-state power controller isolation voltage acquisition circuit device, and the device comprises an AC voltage acquisition unit which is used for achieving the voltage acquisition of an AC solid-state power controller; the isolated power supply unit is used for providing an isolated power supply for the alternating-current voltage acquisition unit; the reference voltage unit is used for providing reference voltage for the AC voltage acquisition unit; and the power supply unit provides a power supply for the AC voltage acquisition unit. According to the technical scheme of the invention, the size of the sampling circuit can be reduced while voltage acquisition is realized, and the acquisition precision and safety of the sampling circuit are improved.

The automatic testing device comprises a verification mother board, a verification daughter board, a program control direct current power supply, a digital multimeter, an angle simulation instrument, a signal generator and an upper computer, and the upper computer is provided with upper computer software of the automatic testing device for the synchronous-to-digital converter. Power input, reference input voltage and angle synchronous input signals needed by the synchronous-digital converter are provided, and normal work of the two-channel synchronous-digital converter is achieved. Synchronous conversion angle signals and reference voltage are input through the angle simulation instrument, the converter outputs corresponding binary bit angle digital signals, and the controller collects the corresponding angle digital signals, converts the angle digital signals into angles and transmits the angles to the upper computer through a serial port. And the high and low levels output by the synchronous-digital converter are measured by the digital multimeter and then are transmitted to the upper computer. And finally, the upper computer judges whether the standard is reached or not. Test indexes comprise shaft angle conversion, resolution, output high level, output low level and the like.

Disclosed in the present disclosure is a multi-functional network tester, including a central control module, a power module, and one or more of a network cable length measurement module, a line-finding module, a switch detection module, and a network cable line-alignment module, in which the multi-functional network tester further includes an optical power module or a multimeter module, the network cable length measurement module, the line-finding module, the switch detection module and / or the network cable line-alignment module are connected to the central control module respectively, the optical power module or the multimeter module is connected to the central control module, and the power module is used for power supply.

The utility model provides a multi-electrical-quantity data acquisition device based on a universal meter card, and relates to the field of electrical quantity data acquisition, and the device comprises an input module which comprises a plurality of signal input channels; the switching matrix module is connected with the input module; the universal meter card is connected with the switching matrix module; the embedded computer is connected with the universal meter card; the switching control module is respectively connected with the switching matrix module and the embedded computer; wherein the embedded computer generates and sends a control instruction, the switching control module receives and decodes the control instruction to generate a control word, the switching matrix module performs multi-selection on multiple paths of input signals in the input module according to the control word and sends a selected signal to the universal meter card, and the universal meter card measures the selected signal. And the measurement result is transmitted back to the embedded computer, so that the technical problems of high cost, large size and inconvenience in carrying of the whole device due to multiple signal types and multiple channels of the existing data acquisition device are solved.

The invention belongs to the technical field of power generation engineering, particularly relates to an automatic test tool applied to a circuit breaker and a miniature circuit breaker, and aims to solve the problems of easy measurement error and low detection efficiency of manual detection, and provides the following scheme: the automatic test tool comprises a conveying rack, and conveying rollers which are symmetrical to each other and are equal in height are respectively fixed at two ends of the conveying rack; the same tooth conveying belt is wound between the circumferential outer walls of the two conveying rollers, and circuit breaker fixing modules which are distributed at equal intervals are fixed to the working face of the tooth conveying belt and used for fixing a circuit breaker body to be detected. When the circuit breaker body needs to be tested, only the fixed circuit breaker body needs to be moved between the two touch test modules, and then the two touch test modules are controlled to move towards the middle at the same time until the contact modules touch the wiring terminals of the circuit breaker body. At the moment, the on-off condition of the circuit breaker body can be known according to the voltage difference display of each pole.

The utility model discloses an electrical instrument with a protection structure, which relates to the technical field of electrical instruments and comprises a universal meter with a shell body and a protection assembly. The protection assembly comprises a protection unit, a rotating and overturning unit and a supporting unit. The protection unit is matched with the protruding edge to achieve scratch-proof protection of the front end of the shell body. The rotating and overturning unit is used for achieving the effects that the protection unit is opened in a rotating mode and connected with the rear end of the shell body in a sleeving mode. According to the utility model, through the arrangement of the protection assembly, the front end of the shell main body is sleeved with the protection cover, so that the front end of the shell main body can be protected, the situation that an external object is in contact with a display screen at the front end of the shell main body and scratches the display screen is effectively avoided, and meanwhile, the protection cover can be sleeved with the rear end of the shell main body through horizontal rotation and vertical overturning; therefore, the front end of the shell main body is exposed to facilitate measurement operation, and the protective cover does not interfere with the use of the universal meter.

A device for testing a voltage level in an electrical terminal cavity including a testing body and a probe for contacting the electrical terminal cavity. The probe includes a tip portion having a first cross-sectional area, a base portion having a second cross-sectional area, and an intermediate portion extending from the tip portion to the base portion having a third cross-sectional area. The first cross-sectional area is smaller than the third cross-sectional area, the third cross-sectional area is smaller than the second cross-sectional area, and the intermediate portion is concentric with the tip portion and the base portion. An axis extends between a center of the tip portion, a center of the intermediate portion, a center of the base portion, and a center of the testing body. The device also includes a circuit operatively coupled with the probe to sense the voltage level in the electrical terminal cavity.

The invention relates to the technical field of universal meters, and provides an automatic power-on and power-off universal meter and a control method thereof, and the automatic power-on and power-off universal meter comprises a handheld state detection unit which is used for detecting whether a user holds a meter pen of the universal meter or not and generating a corresponding state signal; the measuring unit is used for measuring a resistance value and / or a voltage value of a meter pen contact point; the control unit is used for controlling the multimeter to be switched to a power-on state when the state signal indicates that the meter pen is held by hand; if the effective resistance value or the effective voltage value detected by the measuring unit is received, the power-on state is maintained; and if the state signal indicates that the meter pen is not held by the hand, and the received resistance value detected by the measuring unit is infinite and the voltage value is smaller than a preset voltage threshold value, the multimeter is controlled to be switched to a power-off state. On the premise that a physical key is cancelled, user intention detection is achieved, and quick and reliable response can be ensured.

The invention provides an equipment testing system and method and electronic equipment, relates to the technical field of electronics, and can quickly realize input testing of the equipment. The system comprises a control terminal, power supply equipment and an intelligent digital power meter, the control terminal is in communication connection with the power supply equipment and the intelligent digital power meter; the control terminal is used for generating a test list based on input information and sending the test list to the power supply equipment, and the input information at least comprises rated voltage, rated frequency and voltage tolerance of the tested equipment; the test list records test voltage and test frequency corresponding to at least one test item of the tested equipment; the power supply equipment is used for supplying power to the tested equipment according to the test voltage and the test frequency corresponding to each test item; and the intelligent digital power meter is connected between the power supply equipment and the tested equipment and is used for determining an input test result of the tested equipment corresponding to each test item and uploading the input test result to the control terminal.

The invention relates to an electronic device (10) adapted for detecting at least one overvoltage or overcurrent on at least one control line of an electrical machine comprising at least two sensors (1000, 1100, 1200) respectively coupled to at least two separate control lines, a microcontroller (100) adapted to receive an electrical signal on a first input terminal (110), each sensor (1000, 1100, 1200) being adapted to detect the occurrence of an overvoltage or overcurrent on the control line to which it is coupled, and to generate an electrical signal on a sensor output (1001, 1101, 1201) representative of said overvoltage, the electronic device (10) is on the one hand respectively coupled to each sensor (1000, 1100, 1200) and on the other hand coupled to the input terminal (110). Figure for abstract: Figure 1

The utility model provides a test tool used for a heating wire finished product, comprising a megohmmeter, the lower side of the megohmmeter is provided with a support box plugged with the megohmmeter, two parallel side surfaces of the support box are respectively provided with an insulating plate used for supporting the heating wire finished product, and the insulating plates are arranged on the two parallel side surfaces of the support box. The sides, close to the supporting box, of the upper surfaces of the two insulating plates are each provided with a vertically-arranged conductive column used for pressing and holding the end of a finished heating wire, the upper surface of each conductive column is sunken downwards to form an insertion groove matched with the pen head of a meter pen, and the side, close to the supporting box, of the outer surface of each conductive column is provided with a supporting lug. The upper surface of the support lug is provided with a guide hole, a guide rod is inserted in the guide hole, the lower end of the guide rod is fixedly connected with the insulating plate, the upper end of the guide rod is provided with a top tray, and a spring in a compressed state is arranged between the top tray and the support lug. And the fatigue feeling of operators can be reduced.

The invention discloses a high-power impedance and current-carrying capacity testing device and method, and relates to the technical field of impedance and current-carrying capacity testing. The device comprises an input protection module, a self-coupling adjustable transformer, a mode switching module, a current boosting transformer, an alternating current and direct current switching module, a sampling module, a signal processing and control module, a system display module and a device control panel. According to the invention, input protection-voltage control-mode switching-voltage adjustment-AC / DC conversion-parameter measurement and control are taken as the core work flow of the test device, and through electrical connection of the modules, safe conversion of an external power supply and stable and accurate adjustment and output of test voltage and current are realized. The device has the functions of impedance testing and current-carrying capability testing.

The invention discloses a full-parameter automatic test system suitable for a dual three-channel RD converter. The system sets and controls a tested product and a test instrument through computer control software, and realizes automatic test of performance parameters and functions of the to-be-tested dual three-channel RD converter under different temperature conditions according to a full-parameter automatic test process set by the computer control software. And automatically recording the test data and storing the test data to form a test record table. According to the invention, the test efficiency and test coverage of the dual three-channel RD converter can be effectively improved, and the actual result shows that a single converter can complete the test of all parameters within 5 minutes and automatically form a test record. Compared with a traditional manual test, the method has better efficiency and consistency, and is suitable for batch production test of the dual three-channel RD converter.

The invention relates to the technical field of electric power auxiliary tools, in particular to a multimeter convenient to carry and a using method thereof, an elastic wire is connected between a multimeter body and a measuring electroprobe, a plurality of sliding grooves are formed in the outer side of the measuring electroprobe in the circumferential direction, measuring probes are arranged in the sliding grooves in a penetrating mode, and the measuring probes are arranged in the sliding grooves in a penetrating mode. The elastic wire penetrates through the measuring electroprobe and is fixedly connected with the measuring probe, and a control button is fixed to the end, close to the elastic wire, of the measuring probe. According to the universal meter, the measuring electroprobe is placed in the measuring electroprobe placing groove, the portability is enhanced, the measuring electroprobe is provided with the sliding groove and the adjustable measuring probes, the control button and the clamping groove are matched, the measuring flexibility and precision are improved, the searchlight at the point of the measuring electroprobe has an additional function, and the universal meter body is provided with the adjustable supporting legs, so that the universal meter is convenient to use. And the user experience is optimized.

A kit for monitoring an oil-immersed or oil-filled transformer 4 comprises: a communication device 1 and at least three sensors 3 to determine different characteristics of the transformer. The sensors are connected to the communication device using cables and the communication device forwards measured sensor data to a remote database 5. The sensors may measure temperature, humidity, gas content, partial discharge, pressure, liquid level, power, frequency, phase angle, harmonics, impedance, insulation or grounding resistance, earth fault current, arcs, overload or short circuit. Top oil temperature, bottom oil temperature, ambient temperature and winding current may particularly be measured. The kit may be installed to upgrade or service an existing transformer. The measured data may be encrypted before transmission or a certificate may be used to authorize communication. The kits may be used to monitor a fleet of installed transformers remotely.

The utility model discloses a self-adaptive frequency measurement circuit and a universal meter. The circuit comprises a first protection module, a second protection module, a voltage division module, a selection module, a voltage measurement module, a frequency measurement module and a control module. The first protection module is electrically connected with the voltage input end, the voltage dividing module, the second protection module and the selection module. The voltage division module is also electrically connected with the selection module and the voltage measurement module; the second protection module is also electrically connected with the frequency measurement module and the common end; the selection module is also electrically connected with the control module and the frequency measurement module; the voltage measuring module is also electrically connected with the control module; and the frequency measurement module is also electrically connected with the common end and the control module. The input voltage is compared with the specified threshold value, when the voltage is large, the input voltage is divided, unreliable measurement results caused by too high voltage are prevented, when the voltage is small, the voltage division circuit is disconnected, frequency measurement is directly carried out, and the accuracy of low-voltage frequency measurement is guaranteed.

The invention discloses a multimeter pen device capable of switching positive and negative electrodes and a multimeter device, and relates to the technical field of circuit detection, and the multimeter pen device comprises a positive electrode pen, a negative electrode pen, a switching circuit and a change-over switch. Wherein the switching circuit comprises a first output end and a second output end; the positive meter pen is conducted with the first output end through the switching circuit; the negative electrode meter pen is conducted with the second output end through the switching circuit; the change-over switch is used for controlling the switching circuit, and when the change-over switch is triggered, the positive electrode meter pen is switched to be conducted with the second output end, and the negative electrode meter pen is switched to be conducted with the first output end. According to the universal meter, the positive electrode and the negative electrode of the two meter pens can be switched through the switching circuit, and the problem that the pens are frequently replaced when the universal meter is used can be avoided.

The utility model relates to the technical field of electric automobiles, in particular to automobile electric power detection equipment, which solves the problem that the detection process of an automobile storage battery is troublesome, and comprises a base, a primary transverse pushing seat and a secondary transverse pushing seat, and the upper side of the front end of the base is higher than the upper side of the rear end of the base. The middle end of the first-stage transverse pushing seat movably penetrates through the lower end of the base back and forth, a first spring is fixed between the front end of the first-stage transverse pushing seat and the front end of the base, and the upper half part of the rear end of the first-stage transverse pushing seat protrudes forwards to form an abutting head frame. And the two power connection plates can be directly and transversely inserted into the positive electrode and the negative electrode of the storage battery and can be always inserted into the positive electrode plug and the negative electrode plug of the universal meter, so that the plug of the universal meter can be electrically connected with the positive electrode and the negative electrode of the storage battery without frequently opening the positive electrode plug and the negative electrode plug of the universal meter, and the use is convenient and stable.

The invention provides a pressure switch sensor detection device, and relates to the technical field of detection devices.The pressure switch sensor detection device comprises a universal meter main body, a display screen is arranged on one side of the universal meter main body, an adjusting disc is arranged on one side of the universal meter main body, and connecting wires are uniformly arranged on one side of the universal meter main body; the universal meter comprises a universal meter main body, one side of the universal meter main body is provided with a storage device, the storage device comprises a rotating rod, the rotating rod is rotatably inserted in the back surface of the universal meter main body, and one end, far away from the universal meter main body, of the rotating rod is fixedly connected with a storage disc. The end, away from the universal meter body, of the connecting wire is inserted into the circular groove, then the inner wall of the first rubber plate extrudes the surface of the end, away from the universal meter body, of the connecting wire, so that the end, away from the universal meter body, of the connecting wire is conveniently limited to the inner wall of the storage disc, and then the connecting wire is controlled to be wound in the storage disc. Therefore, the connecting wire is convenient to store.

The utility model discloses an anti-drop digital multimeter, and belongs to the technical field of digital multimeters. According to the anti-falling digital multimeter, a double-layer shell structure, a display screen protection design, a circuit board fixing design and anti-falling measures are adopted, so that the anti-falling performance of the digital multimeter can be effectively improved, and the damage to the digital multimeter during falling is reduced. When the digital multimeter falls accidentally, the tension spring and the spring can buffer the impact force caused by falling, so that the impact force on the display screen and the circuit board is reduced, and the internal parts of the multimeter can be effectively protected from being damaged. The anti-falling digital multimeter has good anti-falling performance, so that the damage of the digital multimeter in the use process can be reduced, the service life of the digital multimeter is prolonged, and the anti-falling digital multimeter has the effects of improving the anti-falling performance and prolonging the service life.

The utility model discloses a power equipment fault detection and troubleshooting device. The device comprises a multimeter; the detection pen is composed of a handle and a detection needle, a wire clamping opening is formed in the end portion of the detection needle, and a wire clamping assembly used for clamping the detection needle and an electric wire of the electrical equipment is installed at the end, close to the wire outlet, of the interior of the detection needle. According to the utility model, an electric wire is arranged at the wire clamping port of the detection needle, and then the rotating handle is rotated, so that the cam connected to the outer side of the rotating shaft extrudes the stand column to move towards the inside of the detection needle, and at the moment, the sliding rod enables the pressing plate to move inwards at the wire clamping port of the detection needle under the cooperation of the positioning frame and the limiting column, so that the electric wire and the detection needle are locked conveniently; in this way, the problem that the detection needle is separated from the wire due to shaking in the troubleshooting process of the power equipment can be avoided, the stability during detection is improved through the structure, and meanwhile the troubleshooting efficiency of power equipment fault detection is greatly improved.

An overcurrent monitoring method which can be implemented by computer program instructions executed by one or more hardware processors. In some embodiments, the method can include providing in a semiconductor device tester a device under test, controlling testing signals to the device under test by operation of an electromechanical switch electrically coupled to the device under test, monitoring for an overcurrent condition in the electromechanical switch by directly measuring a testing signal from the electromechanical switch during the operation thereof using a current measurement sensor directly serially connected to the electromechanical switch and determining whether the overcurrent condition has been detected using a detection circuitry electrically coupled to the current measurement sensor. The method can make use of monitoring circuitry to generate excess current signals.

The utility model provides an electronic connector automatic test fixture, relates to the electronic connector test technical field, and comprises a test box, the inner wall of the test box is provided with a T rail groove, and the inner wall of the T rail groove is slidingly connected with a T rail member. In the prior art, a worker needs to use a universal meter to further test the connectivity of the pins, the method is tedious and time-consuming, the accuracy and consistency of the test are difficult to guarantee due to the fact that contacts need to be continuously replaced through manual operation and good contact is guaranteed each time, and errors caused by human factors are very common in actual work. An operator cannot enable a contact to be in complete contact with a pin due to negligence or fatigue, or a connector or a universal meter is moved carelessly in the testing process, so that reading is inaccurate and even some hidden short circuit problems are missed, and the original short circuit problem is omitted due to the factors. And the quality and the yield of the product are further influenced.

The invention discloses a head-replaceable screwdriver integrated with the function of a universal meter, and relates to the technical field of electrician tools, the head-replaceable screwdriver comprises a handle part, a main control circuit board, a rechargeable lithium battery and a Bluetooth device are arranged in the handle part, the surface of the handle part is provided with a display screen and a rotary range selection switch, the end part of the handle part is provided with a connector used for inserting a test wire, and the end part of the handle part is provided with a universal meter; the rechargeable lithium battery, the Bluetooth device, the display screen and the rotary range selection switch are all connected with the main control circuit board, and the rechargeable lithium battery is used for providing stable direct current power supply; a bit; the connecting part is a hollow sleeve with a conductive function, the connecting part is embedded in one end of the handle part, a spring ejector pin mechanism is arranged in the connecting part, the screwdriver head is inserted into the open end of the hollow sleeve, and the tail of the screwdriver head is in contact with the spring ejector pin mechanism so as to conduct electric signals of the screwdriver head and the main control circuit board. The device can solve the problems that a traditional tool is scattered and tedious in operation.

The invention relates to a DC bus short-circuit current level calculation method, device and equipment of a multi-terminal flexible DC back-to-back system. The method comprises the following steps: acquiring system data, electrical quantity data and parameter data; valve side system short-circuit impedance, first valve side short-circuit impedance and first impedance data are obtained through calculation according to the system data, the parameter data and the electrical quantity data; obtaining a first manufacturing deviation and a second manufacturing deviation, and updating the first valve side short-circuit impedance according to the first manufacturing deviation to obtain a second valve side short-circuit impedance; updating the first impedance data according to the second manufacturing deviation to obtain second impedance data; calculating according to the system data, the parameter data, the valve side system short-circuit impedance, the second valve side short-circuit impedance and the second impedance data to obtain an AC short-circuit current component; calculating a discharge current according to the endurance capacity type and the electrical quantity data; calculating short-circuit current according to the discharge current and the alternating-current short-circuit current component; and calculating the short-circuit current level according to the short-circuit current.

The invention relates to the technical field of detection equipment, in particular to a safety detection device for weak current engineering, which comprises a storage unit and a carding unit, and the storage unit is fixedly arranged in a detector. The detection line is stored through the storage unit, the detection line can be shelled during use and can be stored in the detector through the storage unit after use, the use is convenient and fast, the overall attractiveness of the detector is improved, meanwhile, due to the fact that the detection line is stored in the detector, the knotting and winding problems are avoided, and the detection efficiency is improved. And the end part of the brake shoe slides along the inner wall of the friction deceleration ring in a sliding friction manner, so that the resilience force of the vortex spring cannot quickly drive the spool to reversely rotate and reset, and the detection line is prevented from being broken due to the overhigh rotating speed of the spool.