Tf card testing device

Abstract

The application discloses a TF card testing device, a TF card supporting seat is slidably connected in a TF card insertion cavity, a lifting rod is fixed to the lower end of the TF card supporting seat, an inner cavity is arranged in a hollow base, a lifting plate is slidably connected in the inner cavity, the lower part of the lifting rod is movably penetrated into the inner cavity, the lower part of the lifting rod is fixed to the upper end of the lifting plate, iron blocks are fixed to the left and right sides of the upper end of the lifting plate, and electromagnets are fixed to the left and right sides of the top of the inner cavity. Then, the power-on button is pressed, at which time the electromagnets are powered on to attract the iron blocks, so that the lifting plate is driven to move upwards, the lifting plate drives the lifting rod to move upwards, and then the lifting rod drives the TF card supporting seat to move upwards, so as to push the TF card out of the TF card insertion cavity and make the TF card fall on the hollow base. In this way, the TF card on the hollow base can be directly grabbed by a worker to be collected, so that the TF card that has been tested can be conveniently and quickly collected, and the efficiency of the worker in testing the TF card is improved.

Description

Technical Field

[0001] This invention relates to the field of TF card testing technology, specifically to a TF card testing device. Background Technology

[0002] A TF card is an extremely small flash memory card. It is mainly used in mobile phones, but due to its small size, it has gradually begun to be used in GPS devices, portable music players, and some flash memory disks as its capacity continues to increase. After the TF card is manufactured, it must be tested by a testing device. Generally, the testing device connects the TF card to a computer, and the computer reads specific information from the TF card to determine whether the TF card meets the sales standards.

[0003] Currently, when testing TF cards, the TF card needs to be placed in the groove of the TF card tray. In order to ensure the accurate positioning of the TF card, after the TF card test is completed, the workers need to manually remove the TF cards one by one, which is time-consuming and affects the efficiency of TF card testing. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a TF card testing device to solve the problems existing in the background art.

[0005] A TF card testing device includes a hollow base, a top plate fixed above it, and a lifting seat movably connected between the hollow base and the top plate. A lifting assembly is installed between the rear of the top plate and the rear of the lifting seat. A control box is evenly fixed to the lower end of the lifting seat. A circuit board is installed inside the control box. A pin holder is fixed to the lower end of the control box and connected to the circuit board. A test pin is connected to the lower end of the pin holder. A TF card tray is fixed to the upper end of the hollow base. TF card cavities are evenly opened at the upper end of the TF card tray. A TF card support is slidably connected inside the TF card cavities. A lifting rod is fixed to the lower end of the TF card support. The hollow base has an inner cavity. A lifting plate is slidably connected inside the inner cavity. The lower part of the lifting rod moves through into the inner cavity and is fixed to the upper end of the lifting plate. Iron blocks are fixed to the left and right sides of the upper end of the lifting plate. Electromagnets are fixed to the left and right sides of the top of the inner cavity. The electromagnets correspond vertically to the iron blocks.

[0006] Preferably, guide posts are fixed at the four corners of the upper end of the hollow base, the upper part of the guide posts is fixed to the lower part of the top plate, and guide sleeves are fixed through the four corners of the lifting seat, with each guide sleeve corresponding to and movably sleeved on the outside of the guide posts.

[0007] Preferably, the lifting assembly includes a fixed side plate, a lead screw motor, a movable side plate, a nut, and a lead screw. The fixed side plate is fixed to the rear end of the top plate, the movable side plate is fixed to the rear end of the lifting seat, the lead screw motor is fixedly installed on the upper end of the top plate, the lead screw is connected to the lower output shaft end of the lead screw motor, the nut is fixed through the movable side plate, the end of the lead screw passes through the nut and is threadedly connected to the nut, and the end of the lead screw is connected to the hollow base bearing.

[0008] Preferably, the number and distribution of the TF card slots correspond one-to-one with the number and distribution of the control boxes.

[0009] Preferably, an up button and a down button are respectively installed on the upper and lower sides of the front end of the hollow base, and both the up button and the down button are electrically connected to the lead screw motor. An energizing button is installed in the middle of the front end of the hollow base, and the energizing button is electrically connected to the electromagnet.

[0010] Preferably, springs are connected to both sides between the upper end of the lifting plate and the top end of the inner cavity.

[0011] Preferably, a matching small lead screw is provided inside the needle holder, one end of which is connected to a small stepper motor. The small stepper motor is fixed to the outer wall of the control box, and the switch control of the small stepper motor is electrically connected to the circuit board inside the control box.

[0012] Preferably, configuring the tilt angle of the test probe includes the following steps:

[0013] Use a laser rangefinder or optical microscope to measure the center position of the TF card pins, including the X and Y coordinates, as well as the Z-axis height of the pins, and record the width, length, and thickness of the pins;

[0014] When the TF card and the test probe are not on the same plane, the tilt angle θ of the test probe is calculated using a function to ensure that its tip is accurately aligned with the center of the pin; Formula:

[0015] in,

[0016] X 引脚 and Y 引脚 These are the X and Y coordinates of the pin center;

[0017] X 针 and Y 针 These are the X and Y coordinates of the tip of test needle 16;

[0018] Z 引脚 It is the Z-axis height of the pin;

[0019] Z 初始 It is the Z-axis height of the needle holder in the initial state of test needle 16.

[0020] Preferably, a small camera is fixedly installed on the bottom of the lifting seat on one side corresponding to the control box. The small camera captures the relative position of the test probe and the TF card pin in real time. Based on the image recognition algorithm, it automatically identifies the positional deviation between the tip of the test probe and the center of the TF card pin. According to the deviation data provided by the image recognition algorithm, the small stepper motor is controlled by the circuit board in the control box to perform real-time dynamic compensation, ensuring that the test probe can be perfectly aligned with the TF card pin every time.

[0021] Beneficial effects: This TF card testing device inserts multiple TF cards one by one into the TF card slot of the TF card tray, ensuring the bottom of the TF card contacts the top of the TF card support. The lifting platform then descends, moving the test probe downwards to test the TF card. After testing, the lifting platform rises, and pressing the power button energizes the electromagnet, attracting the iron block. This causes the lifting plate to rise, which in turn moves the lifting rod upwards. The lifting rod then moves the TF card support upwards, thus pushing the TF card out of the slot and onto the hollow base. This allows workers to easily collect the tested TF cards by simply grabbing a handful from the hollow base, making the collection of tested TF cards convenient and fast, thus improving the efficiency of TF card testing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall invention;

[0023] Figure 2 This is a side view of the lifting seat of the present invention;

[0024] Figure 3 This is a schematic front cross-sectional view of the hollow base of the present invention.

[0025] In the diagram: 1-Hollow base, 2-Guide column, 3-Top plate, 4-Lifting seat, 5-Guide sleeve, 6-Fixed side plate, 7-Screw motor, 8-TF card tray, 9-Up button, 10-Down button, 11-Power button, 12-Moving side plate, 13-Nut, 14-Screw, 15-Control box, 16-Test probe, 17-Inner cavity, 18-Lifting plate, 19-Lifting rod, 20-Spring, 21-Iron block, 22-Electromagnet, 23-TF card slot, 24-TF card support, 25-Small screw, 26-Small cylinder, 27-Small camera. Detailed Implementation

[0026] Please see Figures 1-3The TF card testing device includes a hollow base 1, a top plate 3 fixed above it, and a lifting seat 4 movably connected between the hollow base 1 and the top plate 3. Guide posts 2 are fixed at the four corners of the upper end of the hollow base 1. The upper part of the guide posts 2 is fixed to the lower part of the top plate 3. Guide sleeves 5 are fixed through the four corners of the lifting seat 4. The guide sleeves 5 are movably sleeved on the outside of the guide posts 2. The lifting seat 4 can move up and down between the hollow base 1 and the top plate 3. When the lifting seat 4 moves, it will move along the guide posts 2. At this time, the guide sleeves 5 slide up and down on the outside of the guide posts 2, which plays a guiding and limiting role for the lifting seat 4.

[0027] A lifting assembly is installed between the rear of the top plate 3 and the rear of the lifting seat 4. The lifting assembly includes a fixed side plate 6, a lead screw motor 7, a movable side plate 12, a nut 13, and a lead screw 14. The fixed side plate 6 is fixed to the rear end of the top plate 3, and the movable side plate 12 is fixed to the rear end of the lifting seat 4. The lead screw motor 7 is fixedly installed on the upper end of the top plate 3. The lead screw 14 is connected to the lower output shaft end of the lead screw motor 7. The nut 13 is fixedly inserted into the movable side plate 12. The end of the lead screw 14 passes through the nut 13 and is threadedly connected to the nut 13. The end of the lead screw 14 is connected to a bearing of the hollow base 1. An up button 9 and a down button 10 are respectively installed on the upper and lower sides of the front end of the hollow base 1. Buttons 10 are electrically connected to lead screw motor 7, which is powered by an external power source. By pressing the up button 9, lead screw motor 7 is energized and rotates forward, driving lead screw 14 to rotate forward. Lead screw 14 is threadedly engaged with nut 13, causing nut 13 to move movable side plate 12 upward, which in turn causes lifting seat 4 to rise. By pressing the down button 10, lead screw motor 7 is energized and rotates in reverse, driving lead screw 14 in reverse. Lead screw 14 is threadedly engaged with nut 13, causing nut 13 to move movable side plate 12 downward, which in turn causes lifting seat 4 to descend. Thus, when lifting seat 4 needs to be raised or lowered, it can be operated by pressing up button 9 or down button 10, making operation convenient.

[0028] A control box 15 is evenly fixed to the lower end of the lifting base 4. A circuit board is installed inside the control box 15. A needle holder is fixed to the lower end of the control box 15 and connected to the circuit board. A test needle 16 is connected to the lower end of the needle holder. A TF card tray 8 is fixed to the upper end of the hollow base 1. TF card slots 23 are evenly formed on the upper end of the TF card tray 8. The number and distribution of the TF card slots 23 correspond one-to-one with the number and distribution of the control boxes 15. A TF card support 24 is slidably connected inside the TF card slot 23. A lifting rod 19 is fixed to the lower end of the TF card support 24. The hollow base 1 has an inner cavity 17, inside which a lifting plate 18 is slidably connected. The lower part of a lifting rod 19 extends through the inner cavity 17, and its lower part is fixed to the upper end of the lifting plate 18. Iron blocks 21 are fixed to the left and right sides of the upper end of the lifting plate 18. Electromagnets 22 are fixed to the left and right sides of the top of the inner cavity 17, corresponding vertically to the iron blocks 21. A power button 11 is installed in the center of the front end of the hollow base 1. The power button 11 is electrically connected to the electromagnets 22, which are connected to an external power source. Pressing and holding the power button 11... Energize electromagnet 22, release power button 11, and electromagnet 22 will be de-energized. This allows multiple TF cards to be inserted one-to-one into the TF card slots 23 of the TF card tray 8, ensuring the bottom of each TF card contacts the top of the TF card support 24. At this point, the TF card slots 23 are positioned to hold the TF cards, with the width of the slots matching the thickness of the TF cards. Then, the lifting platform 4 can be lowered, causing the test probe 16 to move downwards and contact the pins of the TF card for testing. The test probe 16 is fixed to its base, so after moving downwards, the test probe 16 is positioned directly in front of the TF card and in contact with its pins. After contact testing, the lifting platform 4 is moved upwards, and then the power button 11 is pressed. At this time, the electromagnet 22 is energized and attracts the iron block 21, which will drive the lifting plate 18 to move upwards. The lifting plate 18 drives the lifting rod 19 to move upwards, and then the lifting rod 19 drives the TF card support 24 to move upwards. In this way, the TF card support 24 pushes the TF card out of the TF card cavity 23 and drops it onto the hollow base 1. In this way, the staff can simply grab a handful of TF cards from the hollow base 1 to collect them together, making it more convenient and faster to collect the tested TF cards and improving the efficiency of the staff in testing TF cards.

[0029] Springs 20 are connected to both sides between the upper end of the lifting plate 18 and the top of the inner cavity 17. When the lifting plate 18 rises, it will squeeze the springs 20. When the electromagnet 22 is de-energized, the springs 20 will push the lifting plate 18 to move down and reset quickly.

[0030] Furthermore, to improve the alignment accuracy between test pin 16 and the TF card pins, reduce poor contact or TF card damage caused by alignment errors, and thus improve testing efficiency and success rate, a fine-tuning mechanism is provided inside the pin holder. This fine-tuning mechanism includes:

[0031] A matching small lead screw 25 is provided inside the needle holder. One end of the small lead screw 25 is connected to a small lead cylinder 26. The small lead cylinder 26 is fixed to the outer wall of the control box 15. A small camera 27 is fixed to the bottom of the lifting seat 4 on one side of the control box 15.

[0032] The circuit board inside the control box 15 can control the rotation of the small stepper motor 26, which in turn causes the small lead screw 25 to rotate, driving the needle holder to move and finely adjust the position of the test needle 16, so that the test needle 16 is in contact with the pin of the TF card during testing.

[0033] Configure the extension tilt angle of test probe 16, including the following steps:

[0034] Use a laser rangefinder or optical microscope to measure the center position of the TF card pins, including the X and Y coordinates, as well as the Z-axis height of the pins, and record the width, length, and thickness of the pins;

[0035] Positioning the TF card: Fix the TF card to be tested on a stable platform, ensuring that the pins of the TF card face the measuring tool.

[0036] Measurement using a laser rangefinder:

[0037] X and Y coordinates: Move the laser rangefinder so that its beam can scan the TF card pins along the X and Y axes, and record the position coordinates of the pin center point on the X and Y axes.

[0038] Z-axis height: Adjust the angle of the laser rangefinder so that its beam is perpendicular to the surface of the TF card, and measure the Z-axis height of the pin center point.

[0039] Measurements were taken using an optical microscope.

[0040] Adjust the microscope: Adjust the microscope to ensure that the pins of the TF card are clearly visible.

[0041] X and Y coordinates: Use the microscope's ruler function to measure the position coordinates of the pin center point on the X and Y axes.

[0042] Z-axis height: The Z-axis height of the pin center point is measured by adjusting the focal length of the microscope.

[0043] When test pin 16 and the TF card are not on the same plane, it is necessary to calculate the tilt angle θ of test pin 16 to ensure that its tip is accurately aligned with the pin center. We can calculate the tilt angle θ using a function.

[0044] formula:

[0045]

[0046] in,

[0047] X 引脚 and Y 引脚 These are the X and Y coordinates of the pin center.

[0048] X 针 and Y 针 These are the X and Y coordinates of the tip of test needle 16.

[0049] Z 引脚 It is the Z-axis height of the pin.

[0050] Z 初始 It is the Z-axis height of the needle holder in the initial state of test needle 16.

[0051] A small camera 27 is fixedly installed on the bottom of the lifting seat 4 on one side of the control box 15. The small camera 27 captures the relative position of the test probe 16 and the TF card pin in real time. Based on the image recognition algorithm, it automatically identifies the positional deviation between the tip of the test probe 16 and the center of the TF card pin. According to the deviation data provided by the image recognition algorithm, the small stepper motor 26 is controlled by the circuit board in the control box 15 to perform real-time dynamic compensation, ensuring that the test probe 16 can be perfectly aligned with the TF card pin every time.

[0052] To implement the specific content of the image recognition algorithm, various image processing and machine learning algorithms can be used to automatically identify the positional deviation between the tip of the test pin 16 and the center of the TF card pin.

[0053] Considering the technical solution of this application, especially the need to capture the relative position of test pin 16 and TF card pins in real time and perform real-time dynamic compensation, a combination of feature matching and template matching is used for the following reasons:

[0054] Feature matching can quickly and accurately identify key feature points of test probe tips and pins.

[0055] Template matching can further improve the accuracy of positioning, especially when it is necessary to identify specific shapes.

[0056] The specific implementation steps of an image recognition algorithm are as follows:

[0057] Image acquisition: Images containing test probes and pins are acquired using a small camera 27.

[0058] Image preprocessing: Perform necessary preprocessing on the acquired images, such as noise reduction and contrast enhancement.

[0059] Feature extraction: Key feature points of test pins and leads are extracted using feature detection algorithms (such as SIFT and ORB).

[0060] Template matching: The template matching algorithm is used to further pinpoint the test probe tip and pin center.

[0061] Deviation calculation: Calculate the positional deviation between the test probe tip and the pin center based on the feature matching results.

[0062] Dynamic compensation: Based on the deviation data, the small stepper motor 26 is controlled by the circuit board in the control box 15 to perform real-time dynamic compensation.

[0063] Through the above algorithm and steps, the relative position of the test pin 16 and the TF card pin can be accurately identified and automatically corrected, thereby improving the accuracy and efficiency of the test.

[0064] The circuit board inside the control box 15 specifically includes:

[0065] 1. Main controller circuit

[0066] Microprocessor / microcontroller: As the core control unit, it is responsible for receiving signals, processing logic, and controlling the operation of various modules.

[0067] Memory: Used to store program code, configuration parameters, and temporary data.

[0068] 2. Motor control circuit

[0069] The driving circuit for the small stepper motor 26 is used to drive the small stepper motor 26 to achieve fine adjustment of the test probe 16.

[0070] Control circuit for lead screw motor 7: Used to control lead screw motor 7 to achieve lifting and lowering of lifting seat 4.

[0071] 3. Image processing circuit

[0072] Image acquisition interface: Used to receive image data transmitted by the small camera 27.

[0073] Image processing chip: processes the acquired image data and identifies the positional deviation between test pin 16 and TF card pin.

[0074] 4. Power Management Circuit

[0075] Voltage regulator circuit: Ensures that each circuit module receives a stable voltage.

[0076] Power conversion circuit: Converts the input power into a voltage suitable for different circuit modules.

[0077] 5. Communication circuits

[0078] Serial communication interface: such as UART, SPI, I2C, etc., used for data exchange with other components (such as the small camera 27). Digital input / output interface: used to control the electromagnet 22 and other digital input / output devices.

[0079] 6. Input control circuit

[0080] Button interface: used to connect the up button 9, down button 10 and power button 11, and to receive operation commands.

[0081] 7. Safety protection circuit

[0082] Overcurrent protection: Prevents excessive current from being drawn due to motor overload.

[0083] Over-temperature protection: Monitors circuit board temperature to prevent overheating.

[0084] 8. Other auxiliary circuits

[0085] Indicator light circuit: Used to display the operating status of the device.

[0086] Buzzer circuit: Used to emit an alarm sound.

[0087] Specific circuit design:

[0088] Main controller circuit

[0089] Microcontroller: STM32 series or other high-performance microcontrollers.

[0090] EEPROM memory: used to store configuration information and calibration parameters.

[0091] Motor control circuit

[0092] Small stepper motor 26 drive circuit: using DRV8825 or similar stepper motor driver chip.

[0093] Screw motor 7 control circuit: Use L298N or other suitable motor driver chip.

[0094] Image processing circuits and image processing chips: for example, the OV7670 image sensor paired with a suitable image processing chip or FPGA.

[0095] Image processing algorithms: Use the OpenCV library or other image processing libraries.

[0096] Power management circuit

[0097] Voltage regulator circuit: Use LM7805 or other voltage regulators.

[0098] Power conversion circuit: Use a DC-DC converter such as LM2576.

[0099] Communication circuit

[0100] Serial communication interface: Use MAX232 or other RS-232 level conversion chips.

[0101] Input control circuit

[0102] Button interface: Use the GPIO interface to read the button state.

[0103] Safety protection circuit

[0104] Overcurrent protection: using a current sensing resistor and comparator circuit.

[0105] Over-temperature protection: using a temperature sensor and comparator circuit.

[0106] Other auxiliary circuits

[0107] Indicator circuit: uses LEDs and current-limiting resistors.

[0108] Buzzer circuit: The buzzer is driven by a transistor.

[0109] In summary, the circuit board within the control box 15 includes a main controller circuit, a motor control circuit, an image processing circuit, a power management circuit, a communication circuit, an input control circuit, a safety protection circuit, and other auxiliary circuits. These circuits work together to achieve precise control of the test probe 16's position and automated management of the TF card testing process.

Claims

1. A TF card testing device, comprising a hollow base (1), a top plate (3) fixed thereon, and a lifting seat (4) movably connected between the hollow base (1) and the top plate (3), characterized in that: A lifting assembly is installed between the rear of the top plate (3) and the rear of the lifting seat (4). A control box (15) is evenly fixed at the lower end of the lifting seat (4). A circuit board is installed inside the control box (15). A needle holder is fixed at the lower end of the control box (15). The needle holder is connected to the circuit board. A test needle (16) is connected to the lower end of the needle holder. A TF card tray (8) is fixed at the upper end of the hollow base (1). TF card slots (23) are evenly opened at the upper end of the TF card tray (8). A TF card support seat (24) is slidably connected inside the TF card slots (23). The lower end of the TF card support base (24) is fixed with a lifting rod (19). The hollow base (1) has an inner cavity (17). The inner cavity (17) is slidably connected with a lifting plate (18). The lower part of the lifting rod (19) moves through the inner cavity (17). The lower part of the lifting rod (19) is fixed to the upper end of the lifting plate (18). Iron blocks (21) are fixed on both the left and right sides of the upper end of the lifting plate (18). Electromagnets (22) are fixed on both the left and right sides of the top of the inner cavity (17). The electromagnets (22) and the iron blocks (21) are vertically aligned. The number and distribution of the TF card slots (23) correspond one-to-one with the number and distribution of the control boxes (15); The electromagnet (22) and the iron block (21) are vertically aligned. A power button (11) is installed in the middle of the front end of the hollow base (1). The power button (11) is electrically connected to the electromagnet (22). The electromagnet (22) is connected to an external power source. Pressing the power button (11) will power on the electromagnet (22). Releasing the power button (11) will de-energize the electromagnet (22).

2. The TF card testing device according to claim 1, characterized in that: The hollow base (1) has guide posts (2) fixed at the four corners of the upper end. The upper part of the guide posts (2) is fixed to the lower part of the top plate (3). The lifting seat (4) has guide sleeves (5) fixed through the four corners. The guide sleeves (5) are movably sleeved on the outside of the guide posts (2) in a corresponding manner.

3. The TF card testing device according to claim 1, characterized in that: The lifting assembly includes a fixed side plate (6), a lead screw motor (7), a movable side plate (12), a nut (13), and a lead screw (14). The fixed side plate (6) is fixed to the rear end of the top plate (3), the movable side plate (12) is fixed to the rear end of the lifting seat (4), the lead screw motor (7) is fixedly installed on the upper end of the top plate (3), the lead screw (14) is connected to the lower output shaft end of the lead screw motor (7), the nut (13) is fixedly inserted in the movable side plate (12), the end of the lead screw (14) passes through the nut (13) and is threadedly connected to the nut (13), and the end of the lead screw (14) is connected to the bearing of the hollow base (1).

4. The TF card testing device according to claim 3, characterized in that: The hollow base (1) has an up button (9) and a down button (10) installed on the upper and lower sides of its front end, respectively. The up button (9) and the down button (10) are electrically connected to the lead screw motor (7). The hollow base (1) has an energizing button (11) installed in the middle of its front end. The energizing button (11) is electrically connected to the electromagnet (22).

5. The TF card testing device according to claim 1, characterized in that: Springs (20) are connected on both sides between the upper end of the lifting plate (18) and the top of the inner cavity (17).

6. The TF card testing device according to claim 1, characterized in that: A matching small lead screw (25) is provided inside the needle holder. One end of the small lead screw (25) is connected to a small stepper motor (26). The small stepper motor (26) is fixed to the outer wall of the control box (15). The switch control of the small stepper motor (26) is electrically connected to the circuit board inside the control box (15).

7. The TF card testing device according to claim 6, characterized in that: Configure the tilt angle of the test probe, including the following steps: Use a laser rangefinder or optical microscope to measure the center position of the TF card pins, including the X and Y coordinates, as well as the Z-axis height of the pins, and record the width, length, and thickness of the pins; When the TF card and the test probe are not on the same plane, the tilt angle θ of the test probe is calculated by a function to ensure that its tip is accurately aligned with the center of the pin; formula: ;in, X 引脚 and Y 引脚 These are the X and Y coordinates of the pin center; X 针 and Y 针 These are the X and Y coordinates of the tip of the test needle (16); Z 引脚 It is the Z-axis height of the pin; Z 初始 It is the Z-axis height of the needle holder of the test needle (16) in the initial state.

8. The TF card testing device according to claim 7, characterized in that: A small camera (27) is fixedly installed on the bottom of the lifting seat (4) on one side of the control box (15). The small camera (27) captures the relative position of the test probe (16) and the TF card pin in real time. Based on the image recognition algorithm, it automatically identifies the positional deviation between the tip of the test probe (16) and the center of the TF card pin. According to the deviation data provided by the image recognition algorithm, the small stepper motor (26) is controlled by the circuit board in the control box (15) to perform real-time dynamic compensation to ensure that the test probe (16) can be aligned with the TF card pin.

Images