Variable magnetoresistive sensor test board

Abstract

The utility model belongs to the technical field of sensor detection, and discloses a variable magnetoresistive sensor test board, which is characterized in that an industrial personal computer, an adjustable resistor, a signal generator, a digital multimeter, a phase meter and a signal amplifier are arranged on the inner side of a cabinet body; the industrial personal computer is connected with the adjustable resistor, the signal generator, the digital multimeter, the phase meter and the signal amplifier through communication interfaces, a printer is further arranged on the inner side of the cabinet body, a drawer is embedded in the bottom of the front face of the cabinet body, a rocker arm is fixed to the side face of the cabinet body, and a displayer is fixed to the outer end of the rocker arm. According to the utility model, manual testing can be replaced, the testing process is more efficient, the testing is more accurate, and manpower resources are saved; the whole cabinet is an integrated cabinet and is convenient to carry; the utility model has the advantages that the maintenance is easy, the reason can be quickly found when the fault occurs, the operation can be recovered in the shortest time, and the loss is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensor detection, and in particular relates to a variable magnetic resistance sensor test bench. Background Art

[0002] At present, when debugging variable reluctance sensors using traditional manual methods, it is necessary to manually adjust the optical dividing head and adjustable resistor. However, due to the high test accuracy and large adjustment range, each debugging work takes a long time and is very labor-intensive. Therefore, a variable reluctance debugging test bench is developed to achieve semi-automatic testing of variable reluctance sensors, improve debugging efficiency and debugging result accuracy.

[0003] Through the above analysis, the problems and defects of the prior art are as follows:

[0004] (1) Manual testing: the testing process is cumbersome and wastes manpower and material resources;

[0005] (2) The types of instruments under test are diverse, making it inconvenient to carry and test;

[0006] (3) When the instrument fails, the user cannot promptly identify the cause;

[0007] (4) Test data is recorded manually and cannot be preserved for a long time. Utility Model Content

[0008] In view of the problems existing in the prior art, the utility model provides a variable reluctance sensor test bench.

[0009] The utility model is implemented in that a variable reluctance sensor test bench is provided with:

[0010] Cabinet;

[0011] An industrial computer, an adjustable resistor, a signal generator, a digital multimeter, a phase meter and a signal amplifier are installed inside the cabinet;

[0012] The industrial computer is respectively connected with the adjustable resistor, the signal generator, the digital multimeter, the phase meter and the signal amplifier through the communication interface.

[0013] Furthermore, a printer is also arranged on the inner side of the cabinet.

[0014] Furthermore, a drawer is embedded at the bottom of the front side of the cabinet.

[0015] Furthermore, a rocker arm is fixed to the side of the cabinet, and a display is fixed to the outer end of the rocker arm.

[0016] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the utility model are as follows:

[0017] First, in view of the technical problems existing in the above-mentioned prior art, some creative technical effects are brought about after solving the problems. The specific description is as follows:

[0018] 1) The utility model can replace manual testing, making the testing process more efficient, more accurate, and saving human resources;

[0019] 2) The utility model is an integrated cabinet, which is convenient to carry;

[0020] 3) The utility model is easy to maintain. When a failure occurs, the cause can be quickly found and the operation can be restored in the shortest time to reduce losses;

[0021] 4) The utility model can diagnose faults that occur during operation, so that users can solve the problems in time.

[0022] Second, when the variable reluctance debugging test bench is running, the system is required to respond quickly and run smoothly when performing long-term, high-speed data collection. In order to meet this requirement, the test system is developed using multi-threading technology to collect data in parallel, and the main control thread dynamically schedules the working thread according to the system load, making full use of computer resources to achieve real-time data collection; at the same time, the system uses checkpoint technology to monitor the status of application operation and real-time data recording. The main control thread can restart and restore the working thread with problems based on the checkpoint data to ensure the stable operation of the entire system. The system is also highly integrated and convenient for users to operate.

[0023] According to the procedures specified in GJB / Z27-1992 "Electronic Equipment Reliability Thermal Design Manual", the temperature rise of each test system is controlled to avoid system failure due to temperature exceeding the specified value, and each test instrument is placed reasonably.

[0024] All test cables of this system are shielded cables, which can effectively prevent external interference from affecting the system's collected data.

[0025] For each key test subsystem, local data is collected in real time, limiting the possible drift of the collected data within a certain range, so that each subsystem can still work normally under the worst conditions.

[0026] Connectors and fasteners that may come loose during use should have effective anti-loosening measures, such as using spring washers, self-locking nuts or thread lockers.

[0027] Parts that are prone to collision with other objects or must be supported on a certain structure should be equipped with protective pads;

[0028] Targeted protective measures must be taken for places where accidents may occur and endanger property and personal safety;

[0029] Connectors and fasteners that may loosen during use should have effective anti-loosening measures, such as spring washers, self-locking nuts or thread lockers.

[0030] The equipment should be grounded, equipped with protective covers and other protective measures and should comply with the provisions of GJB457 to avoid electric shock to personnel.

[0031] Protective devices are installed on all contacts, terminals and similar places to prevent people from accidentally contacting high voltage, and the equipment is equipped with a switch that can cut off the power supply to the equipment.

[0032] The variable reluctance debugging test bench is more efficient than ordinary manual testing methods. Semi-automatic testing improves debugging efficiency and the accuracy of debugging results.

[0033] The structural design needs to comprehensively consider heat dissipation, anti-vibration, maintainability, etc. Create a good environment for the equipment to work normally and reliably. The specific requirements are: fully implement standardization, generalization, serialization, and modularization requirements. The human-machine relationship is coordinated and meets relevant standards, so that the operator can operate conveniently, comfortably, and accurately. The equipment has good maintainability, and units that need frequent maintenance must have good detachability. The structural design must meet the equipment's requirements for strength and rigidity, and should minimize weight and size. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a variable reluctance sensor test bench provided by an embodiment of the utility model;

[0035] Figure 2 This is a connection principle diagram of a variable reluctance sensor test bench provided by an embodiment of the utility model;

[0036] Figure 3 It is a standard resistor wiring diagram provided by the embodiment of the utility model;

[0037] Figure 4 It is a schematic diagram of a product connector provided by an embodiment of the utility model;

[0038] Figure 5 It is a serial port wiring diagram provided by the embodiment of the utility model;

[0039] Figure 6 It is a power wiring diagram provided by the embodiment of the utility model;

[0040] Figure 7 It is a schematic diagram of a hub provided by an embodiment of the utility model;

[0041] Figure 8It is a wiring diagram of a radio frequency connector provided by an embodiment of the utility model;

[0042] In the figure: 1. Cabinet; 2. Industrial computer; 3. Adjustable resistor; 4. Signal generator; 5. Digital multimeter; 6. Phase meter; 7. Signal amplifier; 8. Printer; 9. Drawer; 10. Rocker arm; 11. Display. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0044] In order to enable those skilled in the art to fully understand how to implement the present invention in detail, this section is an explanatory embodiment that explains the technical solution in detail.

[0045] Clamping fixture: fixed to the optical dividing head;

[0046] Sensor tooling: wiring function;

[0047] Test box: Breadboard, mainly serves as the switching function between instruments and products, phase meter switching, and multimeter switching.

[0048] Relay 1: Switching between sine wave (digital multimeter 1 collects the effective value of sine wave) and electrical characteristics (Party A's instrument).

[0049] Relay 2: Switching between cosine (digital multimeter 2 collects the effective value of the cosine wave) and amplifier (recovery of the excitation signal)

[0050] Relays 3, 4: Adjustable resistor 1 switches;

[0051] Relay 5, 6: Adjustable resistor 2 switches.

[0052] Relay 7: Switching of excitation signal to phase meter

[0053] Relay 8: Product output sine and cosine signal switching.

[0054] The variable reluctance debugging test bench is mainly composed of the following parts:

[0055] 1) Debug equipment control computer: install system software, control test equipment, collect and analyze test data;

[0056] 2) Adjustable resistor: adjust the output resistance of the variable reluctance sensor;

[0057] 3) Digital multimeter: measure the output voltage of the variable reluctance sensor;

[0058] 4) Phase meter: measures the phase difference between the input signal and the output signal of the variable reluctance sensor;

[0059] 5) Test tooling: realize the wiring of the test equipment and the variable reluctance sensor to be tested, and perform wiring U-turn operation at the same time;

[0060] 6) Optical dividing head and tooling: to realize angle measurement function;

[0061] 7) Signal generator: generates basic input signal;

[0062] 8) Signal amplifier: amplifies the basic signal generated by the signal generator and inputs it into the variable reluctance sensor.

[0063] like Figure 1 As shown, an industrial computer 2, an adjustable resistor 3, a signal generator 4, a digital multimeter 5, a phase meter 6 and a signal amplifier 7 are installed on the inner side of a cabinet 1 in the variable reluctance sensor test bench provided by the embodiment of the utility model; the industrial computer 2 is connected to the adjustable resistor 3, the signal generator 4, the digital multimeter 5, the phase meter 6 and the signal amplifier 7 respectively through a communication interface.

[0064] A printer 8 is also provided on the inner side of the cabinet 1 in the embodiment of the utility model.

[0065] A drawer 9 is embedded at the bottom of the front side of the cabinet 1 in the embodiment of the utility model.

[0066] A rocker arm 10 is fixed to the side of the cabinet 1 in the embodiment of the utility model, and a display 11 is fixed to the outer end of the rocker arm 10 .

[0067] (1) Signal generator

[0068] The signal generator in the system is used to generate the basic excitation signal for the variable reluctance sensor. The specific indicators of the signal generator selected by the system are as follows:

[0069] Frequency: 20MHz;

[0070] 1 output channel;

[0071] 160MSa / s sampling rate;

[0072] 16-bit resolution;

[0073] 1mVpp to 10Vpp amplitude adjustment range;

[0074] Standard GPIB interface;

[0075] Generate arbitrary waveforms (sine, square, and other standard signals) point by point and sequencing capabilities.

[0076] (2) Signal amplifier

[0077] The signal amplifier in the system amplifies the signal generated by the signal generator and inputs it into the variable reluctance sensor. The specific indicators of the signal amplifier selected by the system are as follows:

[0078] Channel 2;

[0079] Floating voltage ±42Vpk;

[0080] Full power bandwidth 10kHz@50Vpp;

[0081] Small signal bandwidth>300kHz;

[0082] Input gain 5×;

[0083] Maximum input voltage ±5Vpk;

[0084] Maximum output level ±25Vpk;

[0085] Maximum output current 200mA.

[0086] (3) Digital multimeter

[0087] The system uses a digital multimeter to measure the output voltage of the variable reluctance sensor. The specific indicators of the digital multimeter selected by the system are as follows:

[0088] Resolution 6.5 bits;

[0089] 1-year DCV accuracy 0.00035+0.0005;

[0090] USB interface is standard.

[0091] (4) Resistance (adjustable resistor / standard resistor)

[0092] a Adjustable resistor

[0093] The system uses an adjustable resistor to adjust the output load of the variable reluctance sensor to achieve the output voltage regulation function, programmable resistor box, the specific indicators are as follows:

[0094] Accuracy can reach ±0.1%;

[0095] Minimum setting 0.1Ω;

[0096] Step value 1μΩ;

[0097] Resistance output range: 0.1Ω~999999.9Ω;

[0098] Temperature coefficient 25ppm;

[0099] Power supply: AC 200~240V;

[0100] Communication interface: RS232.

[0101] bStandard resistance

[0102] The system uses standard resistors to adjust the output load of the variable reluctance sensor. The specific indicators are as follows:

[0103] Resistance value: 1KΩ;

[0104] Accuracy: 0.01%;

[0105] Standard power: 0.5W;

[0106] Initial test deviation: 100ppM;

[0107] Weight: 1kg.

[0108] (5) Optical dividing head

[0109] The system uses an optical dividing head to achieve angle adjustment and measurement of the variable reluctance sensor being measured. The specific indicators are as follows:

[0110] Minimum resolution 0.1 second;

[0111] The peak-to-peak value of the instrument's maximum indication error is less than 1 second;

[0112] Real-time digital display of position angle;

[0113] The instrument indication stability is 0.2 seconds;

[0114] The maximum allowable load of the optical dividing head spindle is 40Kg.

[0115] (6) Phase meter

[0116] The system uses phase measurement to measure the phase difference between the input excitation signal and the output voltage of the variable reluctance sensor. The specific indicators are as follows:

[0117] Digital dual-channel display;

[0118] Phase measurement range: ±180° or 0° to +360°;

[0119] 0.5Hz-100Hz accuracy ±0.03°±0.001° / Hz;

[0120] 100Hz-1kHz accuracy ±0.03°±0.005° / kHz;

[0121] 1kHz-100kHz accuracy ±0.04°±0.005° / kHz;

[0122] 100kHz-700kHz accuracy ±0.25°±0.003° / kHz;

[0123] Resolution 0.001°;

[0124] Stability 0.005°;

[0125] Input voltage range 1mV rms to 350V rms;

[0126] Bandwidth 0.5Hz to 700kHz;

[0127] Isolation 2000V;

[0128] Impedance 2Mohm / 10pF.

[0129] (7) Control PC

[0130] The system software is installed on the control PC, and the tester completes the test by operating the software. The specific indicators are as follows:

[0131] Memory: 16G;

[0132] 512G solid state drive;

[0133] i7-10510U processor;

[0134] MX250 graphics card;

[0135] 14-inch display.

[0136] (8) Test cabinet

[0137] In order to ensure the convenience of mobility and integration of the test system, a test cabinet is selected. The test cabinet adopts an assembled design structure and is used to place the digital multimeter, phase meter, signal generator, signal amplifier and the matching display and mouse and keyboard for testing. In addition, the test cabinet can also be used to place tooling test fixtures, and casters and supports can be installed at the same time to facilitate the entire movement.

[0138] The testers of this test cabinet can choose the closable upper and lower wiring channels according to their needs. The size of the large wiring hole at the bottom can also be adjusted as needed, and the dustproof wire entry hole can be replaced. For testers, an environment is needed to operate the instrument under test in all directions and observe the status of the test instrument in all directions. Therefore, the test cabinet we designed uses left and right side doors that can be easily disassembled to facilitate the observation of testers. By adjusting the structure of the test cabinet, it is more in line with the test requirements of this system and ensures the installation and trial of the test master control software.

[0139] (9) Variable reluctance debugging test box

[0140] Since the system has a large number of test equipment and test wiring, and the variable reluctance sensor to be tested is small in size, the system is equipped with a variable reluctance debugging test box for test wiring. The variable reluctance debugging test box contains 2 adjustable precision resistors and 2 standard resistors, and also comes with a laser printer, etc., which is convenient for operation and use. The variable reluctance debugging test box is used to perform variable reluctance sensor wiring and three-floating addition table installation and test rotation. The sine and cosine outputs of the variable reluctance sensor can be monitored in real time. At the same time, the system can realize U-turn operation by operating the variable reluctance debugging test box.

[0141] The utility model realizes the communication control function with the adjustable resistor, digital multimeter, signal generator and signal amplifier through the communication interface such as GPIB, USB, LAN, RS-232, etc. After the tester manually adjusts the optical dividing head, the turntable angle and the data of the digital multimeter can be automatically collected, the digital multimeter can be controlled to record the voltage output by the variable reluctance sensor, and the calculation can be performed according to the corresponding algorithm to realize the relevant functions of variable reluctance installation and debugging and the relevant functions of debugging the variable reluctance sensor element. During the process of adjusting the resistance of the adjustable variable resistor controlled by the system, the U-turn operation can be automatically performed, and the U-turn can be finally recorded in the data, and the test data can be saved locally in Excel format. By using the variable reluctance debugging test bench, the test efficiency and accuracy can be greatly improved.

[0142] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0143] The above description is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention shall be covered by the protection scope of the present invention.

Claims

1. A variable reluctance sensor test bench, characterized in that: The variable reluctance sensor test bench is provided with: Cabinet; An industrial computer, an adjustable resistor, a signal generator, a digital multimeter, a phase meter and a signal amplifier are installed inside the cabinet; The industrial computer is respectively connected with the adjustable resistor, the signal generator, the digital multimeter, the phase meter and the signal amplifier through the communication interface.

2. The variable reluctance sensor test bench according to claim 1, characterized in that: A printer is also arranged on the inner side of the cabinet.

3. The variable reluctance sensor test bench according to claim 1, characterized in that: A drawer is embedded at the bottom of the front side of the cabinet.

4. The variable reluctance sensor test bench according to claim 1, characterized in that: A rocker arm is fixed on the side of the cabinet, and a display is fixed on the outer end of the rocker arm.

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