365 results about "Multimeter" patented technology

The invention discloses an automatic test system for detecting an IO port on an MCU controller, and particularly relates to the technical field of automatic test and hardware-in-the-loop verification, the system takes a TSMaster as an upper computer, a programmable power supply, a digital multimeter and a controllable relay matrix are combined, and input injection, output measurement and controlled power supply disturbance are realized through a CAN / Ethernet / SCPI. The system comprises an input injection and channel switching module, an output drive and high-resistance isolation module, a power supply disturbance and alarm verification module, a unified acquisition and self-calibration compensation module, a criterion evaluation / report module, a regression module and the like, completes alignment and online small signal calibration and crosstalk compensation under a unified time base, constructs a minimum evidence unit, and implements interval criterion and time sequence robustness evaluation. And outputting an auditing report and triggering regression scheduling to realize high coverage of IO port functions and boundary working conditions and repeatable verification.

Provided is a method for the simultaneous determination of parameters, in particular of at least two, three or four parameters, of at least one resin layer applied to at least one carrier material by recording and evaluating at least one NIR spectrum in a wavelength range between 500 nm and 2500 nm, preferably between 700 nm and 2000 nm, more preferably between 900 nm and 1700 nm, and particularly advantageously between 1450 nm and 1550 nm, using at least one NIR measuring head, in particular at least one NIR multimeter head.

The utility model discloses a photodiode dark current testing device, comprising an LED lamp, a light shield, a dual-channel power supply, a desk type universal meter, a one-chip microcomputer control board and a multi-channel test board, the light shield is covered on the multi-channel test board, the multi-channel test board is provided with PD sockets having the same number as the channels of the multi-channel test board, and the PD sockets are connected with the desk type universal meter. The PD socket is composed of a 4P socket and Y-shaped sockets arranged side by side. After the scheme is adopted, the efficiency is greatly improved through multi-channel testing, and the vertical pins can be automatically tested through the design of the Y-shaped socket.

The invention discloses a testing device for a PCB (Printed Circuit Board). The testing device comprises a testing box body, a testing jig, a testing instrument and a control upper computer, a simulation battery module, a logic control module, an intermediate relay module, a reference BMS module and a power supply are arranged in the test box body; the simulation battery module outputs multiple paths of adjustable cell voltages for sampling of a PCB to be tested, the logic control module receives an instruction of an upper computer to control a test process, the intermediate relay module realizes signal switching and on-off control, the reference BMS module provides function parameter comparison, and the test instrument comprises an electronic load and a universal meter. The device is used for detecting parameters such as discharge performance, voltage and current. The test fixture is fixed and connected with a to-be-tested PCB, the contact port assembly can be replaced to adapt to different models, and the code scanning gun inputs test information and triggers a process. The device has the functions of multi-path voltage simulation, automatic signal switching and data acquisition and tracing, is modularized in structure and high in adaptability and expansibility, and can improve the batch detection efficiency and precision.

The invention relates to the technical field of semiconductor material thermoelectric performance testing, in particular to a bismuth telluride sheet material Seebeck coefficient measuring device. The device mainly comprises a flexible measuring device and a data acquisition system, the data acquisition system is provided with a universal meter and a programmable power supply, the flexible measuring device is connected to the input end of the universal meter through a signal cable to transmit temperature and pressure signals of a thermocouple, and the flexible measuring device is connected to the output end of the programmable power supply through a power supply cable to transmit the temperature and pressure signals of the thermocouple. And the universal meter and the programmable power supply are respectively connected to the computer through communication cables and are connected with the computer to realize data processing. Through the three-in-one design of flexible contact, synchronous sensing and temperature difference control, accurate measurement of the Seebeck coefficient is realized. Through actual measurement, the temperature control precision of the device is + / -0.1 DEG C, the voltage acquisition resolution is 0.1 mu V, and the Seebeck coefficient measurement error is less than 2%.

1. The name of the design product: intelligent multimeter. 2. The use of the design product: for voltage, current, resistance, capacitance, frequency, duty cycle, diode, temperature, etc. measurement and detection. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

1. The name of the design product: multimeter. 2. The use of the design product: tools for measuring voltage, current, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

1. The name of the design product: multimeter shunt. 2. The use of the design product: used with multimeter to shunt current. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1.

The invention provides a universal aviation cable detection device and method.The device comprises an industrial personal computer, an aviation cable core resistance value measurement host, a test cable and an aviation cable qualification self-judgment system.The measurement host comprises a power supply module, an output board card, an input board card and a power-on indicator light; the self-judgment system comprises a serial port communication module and a qualification self-judgment module integrated in an industrial personal computer. According to the working principle, a constant voltage source is applied to a measured aviation cable through the output board card, a voltage signal is collected through the high-resistance-state AD collection module, calculation and analysis are conducted through the qualification self-judgment module, and high-precision measurement of the resistance value of a cable core, automatic judgment of the line sequence state and intelligent quality evaluation based on a multi-stage configurable threshold value are achieved. Therefore, the problems of low core-by-core measurement efficiency and insufficient precision of a traditional universal meter are solved, and the automation degree and the reliability of aviation cable detection are remarkably improved.

The utility model relates to a special assembly for a test connecting line of an intelligent calibration system device of a digital multimeter. The special assembly comprises a detection line, a detection socket, a detection plug and a V-shaped clamping jaw, the detection plug is a banana head, and the upper end of the detection plug is provided with a V-shaped groove. The detection line comprises a first detection line and a second detection line, two ends of the first detection line and the second detection line are provided with detection plugs, the detection plug at one end is inserted into the detection socket during detection, and the detection plug at the other end is inserted into the detection hole of the digital multimeter to be detected; the opposite faces of the V-shaped clamping jaws are provided with V-shaped protruding blocks matched with the V-shaped grooves of the detection plugs, the upper ends of the V-shaped clamping jaws are provided with V-shaped grooves, the V-shaped grooves and the V-shaped protruding blocks of the V-shaped clamping jaws form a clamping structure, the detection plugs are prevented from sliding off in the grabbing process, the positions of the V-shaped grooves in the detection plugs are arranged to be higher than the tops of the low detection plugs, and grabbing of the V-shaped clamping jaws is facilitated. And the detection socket is connected with the measurement standard equipment to transmit measurement signals, so that the digital multimeters of various models can be detected.

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 application discloses a digital multimeter reading calibration method, and belongs to the technical field of digital multimeter calibration. The application aims at the problem that the existing calibration method is not applicable to the calibration of the digital multimeter reading which is greatly affected by noise and has relatively low linearity in the full range. The application comprises the following steps: pre-processing the initial measurement value of the digital multimeter to obtain a filtered normal measurement value; constructing a training data set based on the filtered normal measurement value, the measurement signal type and the measurement range; combining the measurement signal true value to iteratively train the digital multimeter calibration network until the iteration number reaches a preset number; saving the digital multimeter calibration network model parameters to obtain the trained digital multimeter calibration network; pre-processing the current initial measurement value of the digital multimeter in the measurement to obtain a current filtered normal measurement value; and inputting the current filtered normal measurement value into the trained digital multimeter calibration network to obtain the current output calibration value of the digital multimeter. The application is used for the calibration of the digital multimeter reading.

The invention relates to the field of CAN buses, in particular to an electrical parameter monitoring method and system of a CAN bus and a vehicle, and aims to solve the problem that the real-time performance, the positioning efficiency and the dynamic monitoring capability are seriously insufficient due to a traditional universal meter measurement method.The method comprises the steps that when the CAN bus is in an idle state, preset test current is injected into the CAN bus, and the CAN bus is connected with the preset test current; acquiring electrical characteristic parameters of the CAN bus; judging whether the electrical characteristic parameters are in an abnormal state; when the electrical characteristic parameter is identified to be in an abnormal state, recording abnormal information including the timestamp and the electrical characteristic parameter, and generating an abnormal alarm signal; according to the electrical characteristic parameters in the abnormal state, querying a preset abnormal parameter and fault type mapping library to output a fault positioning suggestion; and reporting abnormal information, abnormal alarm signals and fault positioning suggestions. By applying the scheme, the key electrical characteristic parameters of the CAN bus can be automatically acquired and evaluated in real time, and fault positioning can be quickly guided when abnormity is found.

This utility model discloses a measuring component for control board production, relating to the field of measurement technology for control board production. The measuring component includes a multimeter, a support frame on one side of the multimeter, an adjustment mechanism on one side of the support frame, and a positioning mechanism on one side of the support frame. In use, the multimeter is first placed on one side of the support frame, supported by a support plate. Two measuring probes on one side of the multimeter are placed inside connecting cylinders on both sides of the support frame. An adjustment mechanism is connected to one side of the support frame via a groove, and the positioning mechanism is connected to the adjustment mechanism. The positioning mechanism facilitates quick clamping and positioning of the control board, while the adjustment mechanism allows for easy adjustment of the position of the positioning mechanism.

The invention belongs to the technical field of line fault judgment, and particularly relates to a high-voltage line short-circuit fault judgment test method. The method comprises the following steps: checking and determining tripping of a certain high-voltage feed-out line; line-to-overhaul full discharge is realized; switching the resistance gear of the universal meter to a * 1 gear, and respectively measuring the inter-phase resistance of the three phases of the fault line; during measurement, if the pointer of the universal meter instantly deviates to zero, it shows that a short-circuit fault exists in the line; if the pointer of the universal meter begins to swing rightwards, gradually slows down after reaching the middle and finally deviates to zero, and the whole test process is short, the line has no short-circuit fault; according to the swing condition of the pointer of the universal meter, whether the current line has a short-circuit fault can be judged. According to the invention, the problems of low power transmission efficiency caused by too long fault processing time due to the fact that line lightning trip-out faults need to be checked by an external line electrician and fault points need to be found by disconnecting the user side incoming line disconnecting switches one by one during troubleshooting are solved.

The invention provides a no-load voltage calibration device, and relates to the technical field of voltage calibration, the no-load voltage calibration device comprises a calibration device main body, the calibration device main body is provided with an input end used for connecting a welding power supply and an output end used for connecting a multimeter; a plurality of adjustable resistor assemblies are arranged in the calibration device main body, and the plurality of adjustable resistor assemblies are connected in series; a plurality of control knobs are arranged on the calibration device main body, and each control knob is connected with one adjustable resistor assembly. The input end of the no-load voltage calibration device is used for being connected with a welding power source, and the output end of the no-load voltage calibration device is used for being connected with a multimeter. The multiple adjustable resistor assemblies are arranged on the calibration device body, and when the resistance value of the resistor needs to be changed, the resistance value of the adjustable resistor can be adjusted more accurately through matched adjustment of the multiple adjustable resistor assemblies.

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.

The utility model discloses a traction inverter test system which comprises a main control circuit and an alarm circuit. The main control circuit comprises a test upper computer, an insulation and voltage resistance tester, a programmable power supply, an oscilloscope, a signal generator, a voltage sensor, a current sensor, a relay module, a universal meter, a network switch and a serial port server, and the test upper computer is used for instrument control and product data acquisition; a network switch is respectively connected with an insulation voltage-withstanding tester, a programmable power supply, an oscilloscope, a signal generator and a universal meter, and a serial server is connected with a relay module, a current sensor and a voltage sensor.

1. The name of the design product: intelligent multimeter. 2. The use of the design product: for measuring voltage, resistance, on-off, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

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.

1. The name of the design product: clamp type multimeter (rechargeable). 2. The use of the design product: for measuring current, resistance, voltage, etc. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

The invention discloses a device and method applied to a vehicle CAN physical layer test. The device comprises a power supply module, a universal meter module, an actuator module, an oscilloscope module, a controller local area network signal analyzer module, an upper computer module and an electronic control module. The power supply module is respectively connected with the actuator module and the electronic control module; the electronic control module and the controller local area network signal analyzer module are respectively connected with the actuator module; the actuator module is connected with the universal meter module and the oscilloscope module. And the controller local area network signal analyzer module is connected with the upper computer module. The vehicle controller local area network signal CAN physical layer testing device has the advantages that the mode of automatic switching is adopted, rapid fault injection is achieved, a large amount of time of testing personnel is saved, and the testing efficiency of the vehicle controller local area network signal CAN physical layer is greatly improved; the triodes are adopted as the switches, the switching speed is higher than that of traditional switches and relays, the cost of the whole test system is reduced, and the integrity of controller area network signals CAN is guaranteed.

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.

The application provides a kind of test equipment for measuring buffer tape for high-voltage cable and its detection method, relating to the field of high-voltage cable auxiliary material detection, comprising: support, copper plate one, lifting device, copper plate one is arranged on the upper part of the support, the lifting device is arranged on the bottom of the support through insulating spacer, copper plate two is installed on the lifting platform of the lifting device;The insulating column is fixed through copper plate one, the measuring rod of the dial gauge is through the insulating column, the height of the measuring rod in the insulating column is adjusted by the limiting device, a plurality of insulating columns correspond to a plurality of dials;The upper terminal post is electrically connected with copper plate one, the lower terminal post is electrically connected with copper plate two, the upper terminal post and the lower terminal post are respectively electrically connected with the corresponding detection terminals of the multimeter, for connecting copper plate one and copper plate two into volume resistivity detection loop. Through the process of repeatedly adjusting the compression thickness, measuring resistance and calculating resistivity, a plurality of sets of volume resistivity data under different compression states can be obtained.

The invention discloses a full-automatic calibration method for an unattended digital multimeter, and relates to the technical field of instrument calibration. The method specifically comprises the following steps: obtaining a calibration task; feeding equipment is controlled according to the calibration task to place the digital multimeter on a calibration platform, and the digital multimeter is connected with an SCPI program controller; identifying the type of the digital multimeter, and determining a corresponding calibration process; checking operation is executed according to the checking process; checking whether the detection result of the digital multimeter is qualified or not in the checking operation; if each inspection of the digital multimeter meets the requirements, transferring the digital multimeter to a qualified bin; if any inspection does not meet the requirement, transferring to an unqualified bin; s3, judging whether the number of the to-be-checked tasks in the checking task is 0 or not, if not, repeating the steps S3 to S6, and if yes, ending; and uploading the result of the calibration task to the upper computer. The technical problem of insufficient flexibility of the calibration process in the prior art is solved.

1. Name of the product in this design: Multimeter (1). 2. Purpose of this design: For measuring current, voltage and resistance. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention relates to the technical field of electronic components, in particular to a diode full-automatic test system and a performance test method, and the system comprises a test management server, a programmable test resource array, a feeding and discharging and positioning module and a test station. The test management server is a central processing unit, carries test management software and is responsible for formulating a test process, scheduling and distributing test tasks, centrally storing and managing test data and generating a test report; the programmable test resource array is in communication connection with the test management server, and the programmable test resource array comprises a programmable direct current power supply, a programmable electronic load, a high-precision digital multimeter, a programmable function generator and a multiplexing switch matrix. According to the invention, qualitative leap of efficiency, precision and reliability is realized in production inspection, quality evaluation and sorting links of diodes.

The utility model discloses an electric power detection instrument, belongs to the technical field of electric power detection instruments, and aims to solve the problems that a mechanism for protecting a pen point is lacked, the pen point is exposed outside after a universal meter is used, the pen point is easy to collide and damage with other objects, and an operator is easy to puncture. Comprising a body, the body is provided with multiple groups of uniformly distributed interfaces, the interfaces are movably connected with meter pens, the other ends of the meter pens are provided with insulating columns, the lower parts of the insulating columns are connected with pen points, the external side surfaces of the insulating columns are provided with jacks, and the body is internally provided with a limiting assembly. According to the electric power detection instrument, through the arrangement of the limiting assembly, the insertion hole and the round hole, the function of protecting the pen point is achieved, so that the pen point is prevented from being exposed after the universal meter is used, the pen point of the universal meter is prevented from colliding with other objects, the pen point of the universal meter is prevented from being damaged, and the service life of the universal meter is prolonged; meanwhile, the pen point of the universal meter is prevented from puncturing an operator, and the use safety of the universal meter is improved.

The invention provides a hardware detection method and device for a digital output interface of a motion control system, and the method comprises the steps: triggering the motion control system to enter a pre-configured test mode, and generating an ultralow-frequency periodic signal; the ultralow-frequency periodic signal is output to the target signal pin of the digital output interface without changing related parameters of a normal working mode of the motion control system, and the duration time of a single level in the ultralow-frequency periodic signal is greater than or equal to the preset response time of the universal meter, so that the target signal pin can be measured through the universal meter, and the measurement accuracy is improved. Therefore, the hardware detection of the digital output interface is realized through a simple universal meter, the cost is reduced, and the universal meter is convenient to carry and is more suitable for on-site detection and troubleshooting.