529 results about "Multimeter" 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 battery pack evaluation, and discloses an echelon utilization power battery evaluation method, which comprises the following steps: performing appearance and smell inspection, and screening batteries without damage, liquid leakage and peculiar smell; safety performance tests are sequentially carried out, and the safety performance tests comprise insulation tests, voltage-withstanding tests and elimination of unqualified batteries; performing dynamic environment simulation, performing health state detection through room-temperature and high-low-temperature charging and discharging, rate testing and internal resistance analysis, and evaluating residual capacity and consistency; a high-precision universal meter is adopted for voltage consistency evaluation, the resolution ratio is 0.1 mV, and the measurement error is smaller than or equal to + / -0.5 mV; the temperature consistency is detected by a distributed temperature sensor, the precision is + / -0.5 DEG C, and the sampling interval is less than or equal to 2s; bMS function verification is carried out, and SOC estimation and voltage / current measurement precision are calibrated; and integrating the detection data, and generating a battery health state report and echelon utilization suggestions. The detection efficiency and safety are improved, the resource utilization rate is maximized, and the cost is reduced.

The invention discloses a TBOX offline detection system, and relates to the technical field of offline detection. The feedback states of the five groups of indicator lamps are controlled through an ECU, namely, a light 3 is lightened after binding succeeds, a light 5 is lightened after remote shutdown, a light t1 is lightened after first-stage vehicle locking and 2V is displayed by a universal meter, and a light t1 and a light t2 are lightened after second-stage vehicle locking and 0V is displayed; the 279 ECU simulates a vehicle control unit, virtual vehicle number binding and unbinding are input through the cloud platform, and a relay is controlled to switch a power supply. When a vehicle is searched, the buzzer responds, and the rack integrates all the modules to realize physical connection and operation. The detection includes connection initialization, function detection, fault simulation and data storage, and efficiency and accuracy are improved. According to the invention, the detection efficiency is improved through the fast-plug wire harness and an automatic instruction, and the time consumed by a single machine is shortened to 15 minutes or less; errors are reduced through voltage simulation and acousto-optic feedback, and the fault omission ratio is reduced; the real-time evidence storage of the cloud platform ensures the data traceability, supports multi-dimensional retrieval and report generation, solves the problems of low efficiency, large error and difficult traceability of the traditional scheme, and improves the detection reliability and standardization level.

The invention belongs to the field of tapping machine fault early warning, and particularly relates to a tapping machine fault early warning mechanism and early warning method for battery cabinet machining, which comprises a tapping machine, a tapping machine brake system, a workbench, a fixing module, a gravitation early warning module, a tightening module, a counting early warning module, a pressing module and a power connection detection module, the fixing module is used for keeping the tapping machine stable during power-on detection; the gravitation early warning module is used for displaying the distance that the assembly is pulled by gravitation generated by the drilling and tapping brake coil and the brake clutch plate when the tapping machine is powered on; the tightening module is used for limiting the position of the drilling and tapping brake back plate without preventing the drilling and tapping brake back plate from rotating; the counting early warning module is used for counting the number of rotation turns of the end not passing through the brake system and the end passing through the brake system. The pressing module is used for temporarily fixing the detached brake coil to be tested; and the electric connection detection module is used for detecting whether the inner wall coil of the brake coil to be detected is in good access or not and whether the insulation effect of the insulation coating is perfect or not by using a universal meter.

The invention discloses a ring-down light cavity precision pressure control method and device based on enhanced data-driven PID, and the method comprises the steps: 1) building a ring-down light cavity pressure control device, and integrating a pressure sensor, a proportional valve, a digital multimeter, a DC power supply, a vacuum pump and other key parts; 2) acquiring a proportional valve driving voltage and a pressure feedback signal based on LabVIEW, and constructing a discrete time ARX model of the system; (3) on the basis of the model residual error and the real-time error, an enhanced data driving algorithm is adopted to carry out online self-adaptive updating on PID parameters; 4) filtering high-frequency noise by using a second-order Bessel low-pass filter to improve the signal stability; and 5) realizing closed-loop control under the LabVIEW platform, and monitoring and maintaining the operation performance of the system in real time. The method has the advantages of model self-learning, parameter self-tuning, high robustness, high control precision and the like, is particularly suitable for scenes such as high-precision spectral measurement with extremely high requirements on pressure stability, and has remarkable engineering practical value and popularization and application prospects.

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.

The invention discloses a multifunctional automatic aging system and method, and the system comprises a multi-parameter measurement module, an integrated oscilloscope, a universal meter and a temperature sensor, and is used for measuring the output voltage ripple, the output voltage value, the output current value and the surface temperature of an aging module in real time; the data comparison and judgment unit is used for automatically comparing the real-time measurement data of the multi-parameter measurement module with a preset standard value, recording unqualified data and identifying the corresponding aging module; the abnormity monitoring and processing unit is used for monitoring over-temperature, over-current and overload abnormal states in the aging process in real time, triggering alarm and executing preset processing operation; the database module is used for storing all test data and supporting production process tracking and problem tracing based on the stored data; the report generation module is used for automatically screening test data according to customer requirements and generating a standardized test report; and the control software unit is provided with modules for setting aging time, selecting models of products to be tested, configuring test functions, reporting templates and the like.

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.

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.

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 discloses a safe and simple grounding test liquid crystal display screen, which comprises a lower iron stand, a backlight module and a display module, and is characterized in that the lower iron stand comprises a bottom plate and a side wall extending upwards from the edge of the bottom plate; the backlight module is arranged on the upper surface of the bottom plate; the display module is arranged above the backlight module, an FPC is led out of the display module, a grounding leakage copper block is arranged on the lower surface of the FPC, a conductive double-sided adhesive is pasted on the lower surface of the grounding leakage copper block, a large-size grounding test leakage copper point is arranged on the upper surface of the FPC, and the conductive double-sided adhesive is pasted on the lower surface of the grounding leakage copper block. And the FPC positioned at the grounding copper leakage block and the grounding test copper leakage point is bent to the lower surface of the bottom plate and is adhered and fixed through the conductive double-sided adhesive. The probe of the universal meter can easily test the conductivity and the resistance value of the grounding test copper leakage point and one corner of the lower iron frame, the probe is very convenient to test and operate in the process, and even if the probe damages the grounding test copper leakage point in the test process, the use of the FPC is not influenced.

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 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.

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 utility model discloses a glass-sealed resistor sorting device, and relates to the field of sensor batch detection, the glass-sealed resistor sorting device comprises a box body, a feeding turntable and a feeding turntable, the feeding turntable and the feeding turntable are arranged in the box body, a transfer assembly for conveying glass-sealed resistors is arranged between the feeding turntable and the feeding turntable, and a feeder, a first leveling assembly and a branching assembly are sequentially arranged on the side part of the feeding turntable in the circumferential direction of the feeding turntable; a magnetic attraction block is arranged on the side portion of the feeding rotary disc, a detection assembly and a plurality of grabbing machines are sequentially arranged on the side portion of the feeding rotary disc in the circumferential direction of the feeding rotary disc, the detection assembly is connected to a universal meter, and a plurality of positioning seats used for magnetically attracting glass-sealed resistors are arranged on the circumferential side of the feeding rotary disc in the circumferential direction. The glass-sealed resistor conveying device has the technical advantages that batch conveying of glass-sealed resistors is achieved through the feeding rotary disc and the conveying rotary disc, batch arrangement of the glass-sealed resistors in the conveying process is achieved through the first leveling assembly, the second leveling assembly and the branching assembly, and the detection assembly is connected to a universal meter; batch detection is realized through sequential abutting of the detection probe and the glass-sealed resistors on the C-shaped seat.

1. Name of the product of this design: Graphical user interface for instrument detection and control of electronic equipment. 2. Purpose of this design product: an electronic device. 3. The key design point of this design product lies in the interface content of the graphical user interface on the screen. 4. The picture or photo that best illustrates the key points of the design: Main view of Design 1. 5. The electronic device has a conventional design. The rear view, left side view, right side view, top view, and bottom view of Design 1-Design 3 are omitted. 6. Designate Design 1 as the base design. 7. Purpose of Graphical User Interface: Graphical User Interface is used to display, manage, control and operate various electrical data detected by multimeter. The Design 1 main view is the display interface of the home page. Click any blank area of ​​the Design 1 main view to enter the Design 1 interface change state diagram 1, which is the display interface for automatically identifying the measurement gear. When the instrument automatically identifies the voltage to be measured, the yellow indicator bar at the bottom of the Design 1 interface change state diagram 1 adjusts the gear to other gears (such as the voltage gear at the second gear position), or click and slide the yellow indicator bar at the bottom of the Design 1 interface change state diagram 1 main view to adjust the gear to other gears (such as the voltage gear at the second gear position) to enter the Design 1 interface change state diagram 2. When the instrument automatically identifies that the resistance value of the resistor to be measured is lower than the threshold of the on-off test gear, the yellow indicator bar at the bottom of the Design 1 interface change state diagram 2 adjusts the gear to other gears (such as The continuity test gear is located at the second gear position), or the yellow indicator bar below the sliding design 1 interface change state diagram 2 is adjusted to other gears (such as the continuity test gear at the third gear position), and the design 1 interface change state diagram 3 is entered; when the meter automatically recognizes the resistance to be measured, the yellow indicator bar below the design 1 interface change state diagram 3 is adjusted to other gears (such as the resistance gear at the fourth gear position), or the yellow indicator bar below the sliding design 1 interface change state diagram 3 is adjusted to other gears (such as the resistance gear at the fourth gear position), and the design 1 interface change state diagram 4 is entered; when the mA input hole of the meter detects that the test lead to be tested is inserted, the yellow indicator bar below the design 1 interface change state diagram 4 is adjusted Adjust the gear to other gears (such as the mA gear at the tenth gear position), or click and slide the yellow indicator bar at the bottom of the design 1 interface change state diagram 4 to adjust the gear to other gears (such as the mA gear at the tenth gear position), and enter the design 1 interface change state diagram 5; when the 10A input hole of the instrument detects that the test lead to be tested is inserted, adjust the gear to other gears (such as the 10A gear at the eleventh gear position) by clicking the yellow indicator bar at the bottom of the design 1 interface change state diagram 5, or click and slide the yellow indicator bar at the bottom of the design 1 interface change state diagram 5 to adjust the gear to other gears (such as the 10A gear at the eleventh gear position), and enter the design 1 interface change state diagram 6; the design 2 main view is the user-controlled instrument gear selection button 1. Click the yellow indicator bar below the sliding design 2 interface change state diagram 1 to adjust the gear position to other gear positions, and enter the design 2 interface change state diagram 2; click the yellow indicator bar below the sliding design 2 interface change state diagram 2 to adjust the gear position to other gear positions, and enter the design 2 interface change state diagram 3; click the yellow indicator bar below the sliding design 2 interface change state diagram 3 to adjust the gear position to other gear positions, and enter the design 2 interface change state diagram 4; click the yellow indicator bar below the sliding design 2 interface change state diagram 4 to adjust the gear position to other gear positions, and enter the design 2 interface change state diagram 5;Click the yellow indicator bar below the sliding Design 2 interface change state diagram 5 to adjust the gear to another gear, and enter the Design 2 interface change state diagram 6; click the yellow indicator bar below the sliding Design 2 interface change state diagram 6 to adjust the gear to another gear, and enter the Design 2 interface change state diagram 7; the Design 3 main view shows the display interface when the mA fuse is blown. Click the yellow indicator bar below the sliding Design 3 main view to adjust the gear to another gear, and enter the Design 3 interface change state diagram, which shows the display interface when the 10A fuse is blown.

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.