Portable testing device for backup instrument

Abstract

A portable testing device for a backup instrument is characterized in that four groups of self-locking rollers are arranged at the bottom of a box body structure, a telescopic pull rod is arranged at the side part of the box body structure, a rotary table area is arranged at one side in the box body, a three-axis electric rotary table is arranged in the rotary table area, the three-axis electric rotary table consists of an X axis, a Y axis and a Z axis, and each axis is provided with a speed reducer and a stepping motor; wherein the Z axis in the pitching direction is of a telescopic structure, the axial length change is achieved through manual adjustment, the simulation test area is arranged on the other side in the box body, a micro pump, an air pressure pipeline system, an electrical circuit and a plurality of control switch and signal interfaces are arranged in the simulation test area, and the micro pump is connected with a static pressure hose and a total pressure hose through a three-way interface. The static pressure hose is connected to the static pressure mouthpiece through the static pressure control valve. According to the invention, system-level function testing can be carried out on the backup instrument, and single-piece testing of the combined measurement unit, the strapdown magnetic sensor and the display unit can also be carried out.

Description

Technical Field

[0001] This invention belongs to the field of aviation testing technology, specifically a portable testing device for backup instruments. Background Technology

[0002] Backup instruments, as an airborne system of the aircraft, mainly include a display unit, a combined measurement unit, and a strapdown magnetic sensor. Its main function is to measure and display flight parameters such as the aircraft's heading angle, attitude angle (pitch and roll angle), barometric altitude, indicated airspeed, rate of climb and fall, and field pressure setting value. It also receives and displays the azimuth information from the airborne equipment's radio compass. This system is an independent airborne system and does not interconnect with other systems. It is used to provide the navigator with backup flight parameter information.

[0003] For backup instrument testing, the relevant testing architecture in China is basically the same, consisting of an industrial control computer, an atmospheric data tester, a turntable, a monitor, a regulated power supply, a multimeter, etc. The system architecture is huge, with many components, making it inconvenient to carry. It is only suitable for fixed laboratory environments. For backup instrument testing requirements from the field, it must be disassembled and returned to the indoor environment for testing, which is costly and has a long testing cycle. Summary of the Invention

[0004] In view of the above situation and to overcome the shortcomings of the prior art, the present invention provides a portable testing device for backup instruments, so as to at least partially solve the above technical problems.

[0005] The technical solution adopted in this invention is as follows: This invention proposes a portable testing device for backup instruments, comprising: This includes the enclosure structure, turntable area, and simulation testing area; The box structure is equipped with four sets of self-locking rollers at the bottom and a retractable pull rod on the side; The turntable area is located on one side of the box body and has a built-in three-axis electric turntable. The three-axis electric turntable consists of X-axis, Y-axis and Z-axis. Each axis is equipped with a reducer and a stepper motor. The Z-axis in the pitch direction is a telescopic structure, and its axial length can be changed by manual adjustment. The simulation test area is located on the other side of the enclosure, and contains a micro pump, a pneumatic pipeline system, electrical wiring, and multiple control switches and signal interfaces. The micro pump is connected to the static pressure hose and the full pressure hose via a three-way interface. The static pressure hose is connected to the static pressure port via a static pressure control valve, and the full pressure hose is connected to the full pressure port via a full pressure control valve. The static pressure port and the full pressure port are used to connect to the corresponding sensor interfaces of the measured combination unit to simulate the negative pressure environment corresponding to an altitude of up to 11,000 meters. The electrical circuit is connected to a unified 28VDC power supply interface, which includes 28V input (+), 28V input (-), 28V input spare (+) and 28V input spare (-), and is used to provide working power for the three-axis electric rotary table, micro pump and the object under test; The control switches include a main power switch, a lighting power switch, a magnetic sensor power switch, a combined measurement unit power switch, a display unit power switch, a pump power switch, a total pressure control switch, a static pressure control switch, a turntable power switch, a heading control switch, a pitch control switch, and a roll control switch. Each switch is electrically connected to the wiring terminal of the corresponding electrical component. The signal interface includes a strapdown magnetic sensor docking socket, a combined measurement unit docking socket, and a display unit docking socket, which are used to establish a physical connection with the object under test and transmit data. The simulation test area is also equipped with eight RS422 or HB6096 bus simulation / acquisition interfaces, namely Compass 429 Simulation (A) and Compass 429 Simulation (B), Atmosphere 422 Simulation / Acquisition (A) and Atmosphere 422 Simulation / Acquisition (B), Attitude 422 Simulation / Acquisition (A) and Attitude 422 Simulation / Acquisition (B), and Heading / Magnetic Field 422 Simulation / Acquisition (A) and Heading / Magnetic Field 422 Simulation / Acquisition (B), for connecting external bus instruments to provide or acquire corresponding bus signals; The enclosure panel is also equipped with a total power voltage display, a pump power voltage display, and a turntable power voltage display, which are used to monitor the power supply status of each key component in real time.

[0006] In one embodiment of the present invention, the three-axis electric turntable is made of carbon fiber composite material, with its X-axis, Y-axis and Z-axis arranged orthogonally to each other. The Z-axis is arranged in the vertical direction and has an axial telescopic mechanism. The telescopic mechanism allows the user to compress the Z-axis when the device is not in operation, so as to reduce the overall height of the turntable. When testing is required, the Z-axis can be pulled out to a predetermined length to provide sufficient installation space for fixing the combined measurement unit.

[0007] In one embodiment of the present invention, the micro pump is a diaphragm vacuum pump, whose maximum pumping capacity corresponds to the static pressure value at an altitude of 11,000 meters under standard atmospheric pressure. The pump outlet is led out to the first branch and the second branch through a rigid tee connector. The first branch is connected to the total pressure port via a total pressure control valve, and the second branch is connected to the static pressure port via a static pressure control valve. Both control valves are normally closed electromagnetic shut-off valves, and their opening and closing are independently controlled by the total pressure control switch and the static pressure control switch.

[0008] In one embodiment of the present invention, the 28VDC power supply interface is located on the rear panel of the enclosure and includes 28V input (+), 28V input (-), 28V input spare (+) and 28V input spare (-), which are arranged in a rectangle and are all connected to the power distribution network after the main power switch through internal busbars. The power is then distributed to the corresponding loads through the respective functional power switches. The turntable power switch controls the power supply path of the three-axis stepper motor, and the pump power switch controls the power supply path of the micro pump.

[0009] In one embodiment of the present invention, a docking socket is provided in the middle area of ​​the front panel of the housing, including three independent sockets: a strapdown magnetic sensor docking socket on the left, a combined measurement unit docking socket in the center, and a display unit docking socket on the right. A pitch motor socket is also provided on one side of the strapdown magnetic sensor docking socket. Each socket is connected to the corresponding internal signal processing circuit through a shielded cable and forms a signal path with the corresponding simulation / acquisition interface.

[0010] In one embodiment of the present invention, the eight sets of bus simulation / acquisition interfaces are symmetrically arranged in the upper right area of ​​the front panel of the enclosure. Among them, the compass 429 simulation (A) and compass 429 simulation (B) are a pair of differential HB6096 bus terminals, used to connect an external HB6096 bus instrument to simulate radio compass output; the atmosphere 422 simulation / acquisition (A) and atmosphere 422 simulation / acquisition (B) are a pair of RS422 differential terminals, used to inject simulated atmospheric data into the display unit or acquire its output when there is no combined measurement unit; the attitude 422 simulation / acquisition (A) and attitude 422 simulation / acquisition (B) are another pair of RS422 terminals, used to inject or acquire attitude data; the heading / magnetic field 422 simulation / acquisition (A) and heading / magnetic field 422 simulation / acquisition (B) are a third pair of RS422 terminals, used to replace the strapdown magnetic sensor to provide heading or magnetic field simulation signals.

[0011] In one embodiment of the present invention, a control switch assembly is provided in the lower left area of ​​the front panel of the housing, and a lighting power switch assembly is provided on one side of the control switch assembly. The switches are arranged according to functional zones: the top row consists of the main power switch and the lighting power switch; the middle row, from left to right, consists of the magnetic sensor power switch, the combined measurement unit power switch, the display unit power switch, and the pump power switch; the bottom row, from left to right, consists of the total pressure control switch, the static pressure control switch, the turntable power switch, the heading control switch, the pitch control switch, the roll control switch, and the spare switch. Each switch is a rocker-type mechanical switch with an indicator light, and its contacts are directly connected in series in the power supply circuit of the corresponding load.

[0012] In one embodiment of the present invention, a display component is provided in the lower right area of ​​the front panel of the housing. The display component includes three digital voltmeters, wherein the total power supply voltage display is connected in parallel between the 28V input (+) and the 28V input (-), the pump power supply voltage display is connected in parallel to the output terminal of the pump power switch, and the turntable power supply voltage display is connected in parallel to the output terminal of the turntable power switch.

[0013] In one embodiment of the present invention, the stepper motors of the X-axis, Y-axis and Z-axis of the three-axis electric turntable are connected to the yaw control switch, pitch control switch and roll control switch through independent drive circuits. Each control switch is a two-position self-resetting type. When operating, pressing the corresponding direction will activate the forward or reverse rotation circuit of the axis motor, and releasing it will automatically de-energize it, realizing manual attitude adjustment.

[0014] In one embodiment of the present invention, the outer shell of the enclosure adopts a composite structure of high-strength engineering plastic and aluminum alloy frame. The internal turntable area and the simulation test area are physically isolated by a partition. The partition is provided with cable through holes and equipped with an electromagnetic shielding sleeve to reduce the interference of motor drive noise on the acquisition of sensitive signals.

[0015] The beneficial effects of the technical solution of this invention are as follows: This invention can not only perform system-level functional tests on backup instruments (including self-test, field pressure binding, display screen function, attitude performance, magnetic heading performance, barometric altitude performance, and crosslinking check), but also perform individual component tests on the combined measurement unit, strapdown magnetic sensor, and display unit. This invention introduces a manually adjustable telescopic mechanism through the Z-axis (pitch axis) of a three-axis electric turntable. In the non-working state, it can be compressed to its shortest length to reduce the overall height and allow the turntable to be completely embedded inside the housing, avoiding protruding structures that could cause damage during transportation or excessive space occupation. During testing, it can be pulled out to a predetermined length to provide sufficient installation space and freedom of movement for the combined measurement unit.

[0016] This invention simultaneously integrates attitude excitation and atmospheric pressure environment simulation. A three-axis electric turntable, driven by independent stepper motors and reducers on the X (roll), Y (heading), and Z (pitch) axes, reproduces the angular motion of the aircraft in three-dimensional space. Meanwhile, a miniature diaphragm vacuum pump stably generates a static pressure environment corresponding to an altitude of 11,000 meters, and through independent control of both total pressure and static pressure branches, it flexibly simulates atmospheric parameters such as altitude, airspeed, and rate of climb. The two work together, allowing the measured unit to simultaneously receive both inertial and aerodynamic excitations, realistically reproducing its working state in actual flight, thereby comprehensively verifying its fusion algorithm, sensor response, and output accuracy.

[0017] This invention connects to the power distribution network via the 28VDC four-terminal interface (including primary and backup redundancy) on the rear panel, through an internal busbar, and then to the main power switch. Load isolation is achieved through more than ten dedicated function switches (such as pump power, turntable power, and power supplies for each tested object). Simultaneously, three digital voltmeters (main power, pump power, and turntable power) located on the lower right of the panel monitor the voltage of key nodes in real time in parallel. This allows the operator to intuitively judge power quality, line voltage drop, or load anomalies, effectively preventing motor step loss, pump efficiency reduction, or data misinterpretation due to undervoltage, and significantly improving the reliability of test results.

[0018] This invention constructs a highly open signal ecosystem through three types of docking sockets (magnetic sensor, combined measurement unit, and display) in the center of the front panel and eight sets of bus simulation / acquisition interfaces (covering HB6096 and RS422 protocols) in the upper right corner. This not only supports real-world access and data readback from the measured object, but also allows for the injection of simulation signals via external bus instruments even when any component is missing. For example, the attitude 422 interface can replace the turntable output, the heading / magnetic field 422 interface can replace the magnetic sensor, and the atmosphere 422 interface can directly drive the display.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the portable testing device for backup instruments proposed in an embodiment of the present invention; Figure 2 This is a schematic diagram of the panel of the portable testing device for backup instruments proposed in an embodiment of the present invention; Figure 3 This is a schematic diagram of the portable testing device for backup instruments proposed in an embodiment of the present invention.

[0021] In the diagram: 1. Turntable area; 2. Signal interface; 3. Miniature pump; 4. Control switch assembly; 5. Lighting power switch assembly; 6. Power supply interface; 7. Display assembly; 8. Simulation test area; 1-1. Three-axis electric rotary table; 2-1. Strapdown magnetic sensor docking socket; 2-2. Combined measurement unit docking socket; 2-3. Display unit docking socket; 2-4. Pitch motor socket; 3-1. Full-pressure fitting; 3-2. Static pressure fitting; 4-1. Main power switch; 5-1 Lighting power switch; 5-2 Magnetic sensor power switch; 5-3 Combined measurement unit power switch; 5-4 Display unit power switch; 5-5 Pump power switch; 5-6 Total pressure control switch; 5-7 Static pressure control switch; 5-8 Turntable power switch; 5-9 Heading control switch; 5-10 Pitch control switch; 5-11 Roll control switch; 5-12 Standby switch; 6-1, 28V Input (+); 6-2, 28V Input (-); 6-3, 28V Input Spare (+); 6-4, 28V Input Spare (-); 6-5, Compass 429 Simulation (A); 6-6, Compass 429 Simulation (B); 6-7, Atmospheric 422 Simulation / Data Acquisition (A); 6-8, Atmospheric 422 Simulation / Data Acquisition (B); 6-9, Attitude 422 Simulation / Data Acquisition (A); 6-10, Attitude 422 Simulation / Data Acquisition (B); 6-11, Heading / Magnetic Field 422 Simulation / Data Acquisition (A); 6-12, Heading / Magnetic Field 422 Simulation / Data Acquisition (B); 7-1. Total power supply voltage display; 7-2. Pump power supply voltage display; 7-3. Turntable power supply voltage display. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] A portable testing device for backup instruments according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0024] like Figures 1 to 3 As shown, this embodiment of the invention provides a portable testing device for backup instruments, including: a housing structure, a turntable area, and a simulation testing area; The bottom of the box structure is equipped with four sets of self-locking rollers, and the side is equipped with a telescopic pull rod; The turntable area is located on one side inside the housing, and contains a three-axis electric turntable 1-1. The three-axis electric turntable 1-1 consists of an X-axis, a Y-axis and a Z-axis. Each axis is equipped with a reducer and a stepper motor. The Z-axis in the pitch direction is a telescopic structure, and its axial length can be changed by manual adjustment. The simulation test area is located on the other side inside the housing, and contains a micro pump, a pneumatic pipeline system, electrical circuits and multiple control switches and signal interfaces 2. The miniature pump is connected to the static pressure hose and the total pressure hose via a three-way connector. The static pressure hose is connected to the static pressure port via a static pressure control valve, and the total pressure hose is connected to the total pressure port via a total pressure control valve. The static pressure port and the total pressure port are used to connect to the corresponding sensor interfaces of the measured combination unit to simulate the negative pressure environment corresponding to an altitude of up to 11,000 meters. The electrical circuit is connected to a unified 28VDC power supply interface, which includes 28V input (+) 6-1, 28V input (-) 6-2, 28V input spare (+) 6-3 and 28V input spare (-) 6-4, to provide working power to the three-axis electric rotary table 1-1, the miniature pump and the object under test. The control switches include a main power switch 4-1, a lighting power switch 5-1, a magnetic sensor power switch 5-2, a combined measurement unit power switch 5-3, a display unit power switch 5-4, a pump power switch 5-5, a total pressure control switch 5-6, a static pressure control switch 5-7, a turntable power switch 5-8, a heading control switch 5-9, a pitch control switch 5-10, and a roll control switch 5-11. Each switch is electrically connected to the wiring terminal of the corresponding electrical component. The signal interface 2 includes a strapdown magnetic sensor docking socket 2-1, a combined measurement unit docking socket 2-2, and a display unit docking socket 2-3, which are used to establish a physical connection with the object under test and transmit data. The simulation test area is also equipped with eight RS422 or HB6096 bus simulation / acquisition interfaces, namely Compass 429 Simulation (A) 6-5 and Compass 429 Simulation (B) 6-6, Atmosphere 422 Simulation / Acquisition (A) 6-7 and Atmosphere 422 Simulation / Acquisition (B) 6-8, Attitude 422 Simulation / Acquisition (A) 6-9 and Attitude 422 Simulation / Acquisition (B) 6-10, and Heading / Magnetic Field 422 Simulation / Acquisition (A) 6-11 and Heading / Magnetic Field 422 Simulation / Acquisition (B) 6-12, for connecting external bus instruments to provide or acquire corresponding bus signals; the cabinet panel is also equipped with a total power supply voltage display 7-1, a pump power supply voltage display 7-2, and a turntable power supply voltage display 7-3, for real-time monitoring of the power supply status of each key component.

[0025] In practical applications of this invention, when a test task is initiated, the operator first moves the entire machine to the designated workstation using the four sets of self-locking universal casters at the bottom of the housing and the retractable side rod, locking the casters to prevent slippage. Then, the cover or front panel is opened to access the operating interface. At this point, the device under test, such as a combined measurement unit, strapdown magnetic sensor, or display unit, establishes a physical connection with the device through the corresponding docking sockets 2-1, 2-2, and 2-3. These sockets not only provide a power path but also support bidirectional transmission of various digital bus signals (such as RS422 and HB6096), ensuring that the device under test can be powered on normally and participate in data interaction.

[0026] Meanwhile, an external 28V regulated DC power supply is connected through a 28VDC power supply interface uniformly located on the rear or side of the enclosure. The interface includes main positive and negative terminals 6-1 and 6-2, and backup positive and negative terminals 6-3 and 6-4, forming a redundant power supply path to improve system reliability. After being introduced through the main power switch 4-1, the power is distributed to each functional module. The lighting power switch 5-1 controls the internal lighting, while the magnetic sensor power switch 5-2, the combined measurement unit power switch 5-3, and the display unit power switch 5-4 independently supply power to the three types of measured objects to avoid mutual interference. The pump power switch 5-5 activates the miniature vacuum pump 3, and the turntable power switch 5-8 provides drive voltage to the stepper motor of the three-axis electric turntable 1-1.

[0027] Furthermore, the three-axis electric turntable 1-1 is installed in the turntable area on one side of the housing. The turntable adopts an orthogonal layout of X (roll), Y (yaw), and Z (pitch) axes. Each axis is equipped with a high-precision reducer and a stepper motor, enabling angle positioning and dynamic attitude changes. In particular, the Z-axis (pitch axis) is a telescopic structure. It can be manually compressed in the non-testing state to reduce the overall height of the machine and facilitate storage in a compact housing. During testing, it can be extended to the working length, providing sufficient installation space and freedom of movement for the combined measurement unit. The operator can manually control the machine using the yaw control switch 5-9, pitch control switch 5-10, and roll control switch 5-11 on the panel. Each switch is a two-position self-resetting type; pressing it connects the corresponding motor's forward / reverse circuit, and releasing it stops the rotation, achieving intuitive attitude adjustment. In addition, the turntable also supports automatic control mode: when an external RS422 bus instrument sends commands through attitude 422 simulation / acquisition interfaces 6-9 and 6-10, the internal control circuit parses the commands and drives the corresponding axis motors to complete complex attitude sequences according to preset trajectories, thereby fully verifying the output response characteristics of the combined measurement unit in dynamic environments.

[0028] Furthermore, the simulation test area incorporates a miniature diaphragm pump with sufficient pumping capacity to stably generate static pressure values ​​(approximately 26.4 kPa absolute pressure) corresponding to a standard atmospheric model at an altitude of 11,000 meters. The pump outlet connects to a rigid tee connector, branching into two paths: one through a total pressure control valve to total pressure connector 3-1, and the other through a static pressure control valve to static pressure connector 3-2. Both connectors are connected to the total pressure and static pressure sensor interfaces of the combined measurement unit via flexible hoses. When the operator presses the total pressure control switch 5-6 or the static pressure control switch 5-7, the corresponding solenoid valve opens, and the miniature pump begins to evacuate the corresponding chamber, thereby establishing the required negative pressure difference at the sensor end. By adjusting the pumping time or combining it with pressure feedback (if configured), key atmospheric parameters such as static pressure, indicated airspeed, and rate of ascent / deceleration at different flight altitudes can be simulated, allowing the combined measurement unit to undergo functional verification within its actual operating boundaries. Among them, the Compass 429 Simulation (A / B) 6-5 and 6-6 are a pair of HB6096 differential terminals used to connect to a dedicated HB6096 bus instrument. When there is no real radio compass input, they inject simulated azimuth data into the combined measurement unit or display. The Atmosphere 422 Simulation / Acquisition (A / B) 6-7 and 6-8 and the Attitude 422 Simulation / Acquisition (A / B) 6-9 and 6-10 are two pairs of RS422 interfaces, which can directly provide simulated atmospheric data (such as barometric altitude, airspeed) or attitude angles (pitch, roll, heading) to the display unit even in the absence of a combined measurement unit. The display logic is verified; the RS422 bus signal output can also be acquired during the testing of the combined measurement unit for protocol parsing and performance evaluation by an oscilloscope or bus analyzer; the heading / magnetic field 422 simulation / acquisition (A / B) 6-11 and 6-12 are used to replace the strapdown magnetic sensor. When it is missing or malfunctioning, it injects simulated geomagnetic heading or magnetic field strength data to ensure that the magnetic heading calculation function of the combined measurement unit can still be fully tested. All these interfaces are connected to the high-isolation signal conditioning circuit through internal shielded cables, which effectively suppresses the interference of motor drive noise and power supply ripple on sensitive digital signals.

[0029] In one specific embodiment, the three-axis electric turntable 1-1 is made of carbon fiber composite material, with its X-axis, Y-axis and Z-axis arranged orthogonally to each other. The Z-axis is set in the vertical direction and has an axial telescopic mechanism. The telescopic mechanism allows the user to compress the Z-axis when the device is not in operation, so as to reduce the overall height of the turntable. When testing is required, the Z-axis can be pulled out to a predetermined length to provide sufficient installation space for fixing the combined measurement unit. The micro pump is a diaphragm vacuum pump, and its maximum pumping capacity corresponds to the static pressure value at an altitude of 11,000 meters under standard atmospheric pressure. The pump outlet is led out to the first branch and the second branch through a rigid tee joint. The first branch is connected to the total pressure port 3-1 through the total pressure control valve, and the second branch is connected to the static pressure port 3-2 through the static pressure control valve. Both control valves are normally closed electromagnetic shut-off valves, which are independently controlled by the total pressure control switch 5-6 and the static pressure control switch 5-7.

[0030] In practical applications of this invention, before the test begins, the entire device is in a stowed state: the Z-axis (pitch axis) of the three-axis electric turntable is manually compressed to its shortest stroke, reducing the overall height of the turntable structure and facilitating its complete embedding within the limited space of the housing, thus avoiding collisions or structural interference during transportation or storage. At this time, the micro vacuum pump is powered off, and both the total pressure control valve and the static pressure control valve remain normally closed, ensuring no negative pressure exists in the system pipelines and guaranteeing safety and sealing. After the operator pushes the device to the test position, they first unlock the bottom rollers and extend the side pull rods to stabilize the equipment. Then, they manually and slowly pull the Z-axis from the compressed state to the preset working length. This not only provides sufficient vertical space for the subsequent installation of the combined measurement unit but also restores the standard orthogonal geometric relationship between the X-axis (roll), Y-axis (yaw), and Z-axis (pitch), ensuring the accuracy and repeatability of subsequent attitude excitation. Because the main body of the turntable is made of carbon fiber composite material, it achieves lightweight (the whole machine weighs only 1.85kg) while still having high rigidity and low coefficient of thermal expansion, effectively suppressing deformation caused by motor operation or changes in ambient temperature, thereby ensuring the stability of angle output.

[0031] After completing the mechanical preparation, the operator securely installs the combined measuring unit to be tested onto the special fixture on top of the turntable, and connects its full-pressure interface to the full-pressure connector 3-1 and its static pressure interface to the static pressure connector 3-2 via flexible hoses. At this point, the device enters the electrical and pneumatic integration stage. An external 28V regulated DC power supply is connected to the unified power supply interface. The operator sequentially closes the main power switch 4-1 and the combined measuring unit power switch 5-3 to provide them with working voltage; at the same time, the pump power switch 5-5 is turned on to power the miniature diaphragm vacuum pump 3.

[0032] Subsequently, the operator selectively presses either the total pressure control switch 5-6 or the static pressure control switch 5-7. These two switches control two independent normally closed solenoid shut-off valves: the total pressure control valve and the static pressure control valve. When either switch is closed, the corresponding solenoid valve is energized and opens, and the micro-pump immediately performs a vacuum operation on the connected branch. For example, during a simulated climb, the static pressure control valve can be opened first to gradually reduce the pressure at the static pressure port. The combined measurement unit then calculates the air pressure altitude rise and forward ascent / descend speed. If air velocity needs to be simulated simultaneously, the total pressure control valve must also be opened, and a specific dynamic pressure value is generated by adjusting the pressure difference between the two branches, thereby triggering an indicated air velocity signal. Since the two branches branch off from the pump outlet via a rigid tee connector and each is equipped with an independent control valve, various pneumatic test modes can be flexibly implemented, including static pressure simulation alone, total pressure simulation alone, or a combination of both, thus improving the test coverage.

[0033] Meanwhile, the operator can manually control each axis via the heading control switch 5-9, pitch control switch 5-10, and roll control switch 5-11 on the panel: pressing the switch activates the drive circuit of the corresponding stepper motor, causing it to rotate in the specified direction; releasing it stops the rotation, enabling intuitive attitude adjustment. For example, the Z-axis can be slowly raised to simulate an aircraft pitching up, or the X-axis can be tilted to simulate a roll maneuver. Each axis is equipped with a reducer to ensure sufficient output torque and smooth movement, while the carbon fiber structure effectively isolates motor vibrations from transmission to the unit under test. Specifically, the turntable supports joint testing with barometric pressure simulation: while the combined measurement unit senses changes in barometric pressure and altitude, its inertial sensing element also detects the angular motion applied by the turntable in real time, thereby outputting fused attitude, altitude, and airspeed information.

[0034] In one specific implementation, the 28VDC power supply interface is located on the rear panel of the enclosure, including 28V input (+) 6-1, 28V input (-) 6-2, 28V input spare (+) 6-3, and 28V input spare (-) 6-4, which are arranged in a rectangle and are all connected to the power distribution network after the main power switch 4-1 through internal busbars. The power is then distributed to the corresponding loads through the respective functional power switches. The turntable power switch 5-8 controls the power supply path of the three-axis stepper motor, and the pump power switch 5-5 controls the power supply path of the micro pump. The central area of ​​the front panel of the enclosure is provided with docking sockets, including three independent sockets: strapdown magnetic sensor docking socket 2-1 is located on the left, combined measurement unit docking socket 2-2 is located in the center, and display unit docking socket 2-3 is located on the right. A pitch motor socket 2-4 is also provided on one side of strapdown magnetic sensor docking socket 2-1. Each socket is connected to the corresponding internal signal processing circuit through shielded cables and forms a signal path with the corresponding simulation / acquisition interface.

[0035] In practical applications of this invention, before testing begins, the operator connects an external 28V regulated DC power supply (usually from a ground power vehicle or a dedicated regulated power supply) to the 28VDC power supply interface on the rear panel of the device housing via a standard cable. The interface consists of four terminals: main positive 6-1, main negative 6-2, spare positive 6-3, and spare negative 6-4, arranged symmetrically in a rectangle. This arrangement facilitates correct insertion and provides a physical basis for redundant power supply. The four power lines are connected in parallel to the input side of the main power switch 4-1 via a low-impedance copper busbar. When the operator flips the main power switch, the 28V DC power enters the internal power distribution network and is then distributed to multiple functional branches. The turntable power switch 5-8 specifically controls the power supply paths for the X, Y, and Z stepper motors in the three-axis electric turntable. Because stepper motors generate significant current fluctuations and electromagnetic noise during startup and commutation, physically separating their power supply paths from other sensitive circuits (such as signal acquisition or sensor power supplies) effectively avoids power coupling interference. Similarly, the pump power switch 5-5 independently controls the power supply to the miniature vacuum pump, ensuring that its start-up and shutdown do not cause voltage drops that could affect the normal operation of other modules. In addition, the magnetic sensor power switch 5-2, the combined measurement unit power switch 5-3, and the display unit power switch 5-4 correspond to the three types of measured objects, respectively, realizing "power on demand and independent management," which not only prevents equipment damage due to misoperation but also facilitates phased functional verification.

[0036] Meanwhile, in the central area of ​​the front panel of the enclosure, there is a strapdown magnetic sensor docking socket 2-1 on the left, a combined measurement unit docking socket 2-2 in the center, and a display unit docking socket 2-3 on the right. This arrangement from left to right corresponds to the "sensing, processing, and display" information flow, enabling operators to quickly and accurately complete equipment connections. Furthermore, a pitch motor socket 2-4 is located to one side of the strapdown magnetic sensor docking socket 2-1. This interface is not for the object being measured but is a dedicated channel reserved for connecting external manual attitude adjustment devices or calibration tools. This allows for bypassing the internal turntable control system in specific maintenance scenarios, directly driving the pitch axis motor for fine-tuning, enhancing the flexibility and adaptability of the device.

[0037] Specifically, the inner shield is grounded to the signal reference ground, and the outer shield is connected to the chassis ground, forming dual electromagnetic protection. This effectively suppresses crosstalk between stepper motor drive pulses, vacuum pump start-stop transients, and external radio frequency interference on the RS422 and HB6096 high-speed differential bus signals. Each socket not only transmits power but also carries multiple digital communication signals. For example, the combined measurement unit docking socket 2-2 provides a 28V operating voltage while also connecting to its output RS422 attitude / atmosphere data bus; while the strapdown magnetic sensor docking socket 2-1 transmits raw magnetic heading data or calibration parameters. After the signal is sent to the internal signal conditioning and simulation acquisition circuit via the shielded cable, it can be monitored in real time (e.g., via an external oscilloscope or bus analyzer). Furthermore, when the measured object is missing, analog signals can be injected in reverse through the simulation interface on the panel (e.g., the heading / magnetic field 422 simulation interface) to achieve a "simulation-based" alternative testing mode.

[0038] The entire power supply and signal interaction process is highly coordinated in actual operation. For example, when performing a full-function test on the combined measurement unit, the operator first inserts it into the central socket 2-2 and closes the combined measurement unit power switch 5-3 to power it on and initialize it. Then, the turntable power supply 5-8 and the pump power supply 5-5 are started to apply attitude excitation and air pressure excitation, respectively. At the same time, the RS422 signal output by the combined measurement unit is transmitted back to the internal acquisition circuit through the same socket, and can be led out through the atmospheric 422 or attitude 422 simulation / acquisition interface for external equipment to record and analyze. If it is necessary to verify its fault tolerance capability under non-magnetic sensor input, the left socket 2-1 can be disconnected, and preset magnetic field data can be injected through the heading / magnetic field 422 simulation interface. At this time, the system automatically switches the signal source to maintain the continuity of the test.

[0039] In one specific implementation, eight sets of bus simulation / acquisition interfaces are symmetrically arranged in the upper right area of ​​the front panel of the enclosure. Among them, Compass 429 Simulation (A) 6-5 and Compass 429 Simulation (B) 6-6 are a pair of differential HB6096 bus terminals, used to connect an external HB6096 bus instrument to simulate radio compass output; Atmosphere 422 Simulation / Acquisition (A) 6-7 and Atmosphere 422 Simulation / Acquisition (B) 6-8 are a pair of RS422 differential terminals, used to inject simulated atmospheric data into the display unit or acquire its output when there is no combined measurement unit; Attitude 422 Simulation / Acquisition (A) 6-9 and Attitude 422 Simulation / Acquisition (B) 6-10 are another pair of RS422 terminals, used to inject or acquire attitude data; Heading / Magnetic Field 422 Simulation / Acquisition (A) 6-11 and Heading / Magnetic Field 422 Simulation / Acquisition (B) 6-12 are a third pair of RS422 terminals, used to replace the strapdown magnetic sensor to provide heading or magnetic field simulation signals.

[0040] The control switch assembly is located in the lower left area of ​​the front panel of the enclosure. To one side of the control switch assembly is the lighting power switch assembly, arranged by function: the top row contains the main power switch 4-1 and the lighting power switch 5-1; the middle row, from left to right, contains the magnetic sensor power switch 5-2, the combined measurement unit power switch 5-3, the display unit power switch 5-4, and the pump power switch 5-5; the bottom row, from left to right, contains the total pressure control switch 5-6, the static pressure control switch 5-7, the turntable power switch 5-8, the heading control switch 5-9, the pitch control switch 5-10, the roll control switch 5-11, and the spare switch 5-12. Each switch is a rocker-type mechanical switch with an indicator light, and its contacts are directly connected in series in the power supply circuit of the corresponding load.

[0041] In a specific application of this invention, when a test task is started, the operator first selects the corresponding bus interface in the upper right area of ​​the front panel of the enclosure to connect the peripheral device, based on the type of the object under test and the test target. Eight differential bus terminals are centrally located in the area and divided into four pairs according to function: Compass 429 Simulation (A / B) is used to connect to the HB6096 bus instrument and simulate the azimuth information output by the radio compass; Atmosphere 422 Simulation / Acquisition (A / B) is used to directly inject atmospheric data such as barometric altitude, indicated airspeed, and velocity of climb into the display unit when the combined measurement unit is missing or malfunctioning, or to acquire atmospheric information output by the display; Attitude 422 Simulation / Acquisition (A / B) processes attitude data streams of pitch, roll, and heading angles, which can be used as an excitation source to drive the display to show a specific attitude, or to capture attitude bus signals output by the combined measurement unit; Heading / Magnetic Field 422 Simulation / Acquisition (A / B) replaces the strapdown magnetic sensor to provide simulated values ​​of geomagnetic heading or magnetic field strength, which are used to verify the magnetic heading calculation capability of the combined measurement unit or the heading display logic of the display. All these interfaces adopt the standard RS422 or HB6096 differential electrical specifications, have high common-mode rejection ratio and anti-interference capability, and are connected to high-isolation signal conditioning circuits through internal shielded twisted-pair cables to ensure signal integrity is maintained even in strong electromagnetic environments such as stepper motor start-stop and vacuum pump operation.

[0042] Meanwhile, in the lower left area of ​​the panel, operators sequentially operate the control switch components according to the test procedure. The area adopts a three-level functional zoning layout: the main power switch and lighting power switch in the upper row constitute the system-level entry point. The former controls the main current of the entire machine, while the latter only activates the internal LED lighting, making it easy to observe the connector status in low-light environments; the four switches in the middle row correspond to three types of core test objects (magnetic sensors, combined measurement units, and display units) and key actuators (micro pumps), realizing "power on demand and independent management" to avoid the overall impact of a short circuit or overload in one module; the full pressure and static pressure control switches are used to open and close the corresponding solenoid valves to adjust the negative pressure of the air circuit, and the turntable power switch provides power to the entire three-axis electric turntable; while the yaw, pitch, and roll control switches are directly connected in series in the drive circuit of each axis stepper motor, using a rocker-type mechanical structure with indicator lights. When operating, pressing the switch will activate forward or reverse rotation (depending on the switch direction), and releasing it will automatically reset and de-energize, realizing manual inching attitude adjustment.

[0043] Furthermore, when performing independent functional checks on the display unit, the operator first turns off the power switch 5-3 of the combined measurement unit and disconnects its central docking socket. Then, the external RS422 bus instrument is connected to the Atmosphere 422 and Attitude 422 simulation interfaces respectively, and the display unit power switch 5-4 is closed. At this time, the display only receives the injected signal from the simulation interface. Whether it can correctly parse and display altitude, airspeed, and attitude information directly reflects its own hardware and software status, without relying on other avionics equipment. For example, when verifying the combined measurement unit's ability to process magnetic heading, if the strapdown magnetic sensor is unavailable, the operator can disconnect the left magnetic sensor socket and instead input a preset heading sequence through the heading / magnetic field 422 simulation interface, while simultaneously closing the combined measurement unit power supply, observing whether its output matches the input. If further analysis of its bus protocol compliance is required, an oscilloscope or bus analyzer can be connected to the same terminal pair in acquisition mode to capture its response waveform in real time.

[0044] In one specific embodiment, a display component is provided in the lower right area of ​​the front panel of the housing. The display component includes three digital voltmeters, wherein the total power supply voltage display 7-1 is connected in parallel between 28V input (+) 6-1 and 28V input (-) 6-2, the pump power supply voltage display 7-2 is connected in parallel to the output terminal of the pump power switch 5-5, and the turntable power supply voltage display 7-3 is connected in parallel to the output terminal of the turntable power switch 5-8. The stepper motors of the X-axis, Y-axis and Z-axis of the three-axis electric turntable 1-1 are connected to the heading control switch 5-9, the pitch control switch 5-10 and the roll control switch 5-11 through independent drive circuits. Each control switch is a two-position self-resetting type. When operating, pressing the corresponding direction will activate the forward or reverse rotation circuit of the axis motor, and releasing it will automatically de-energize it, realizing manual attitude adjustment.

[0045] The outer shell of the enclosure is made of a composite structure of high-strength engineering plastic and aluminum alloy frame. The internal turntable area and simulation test area are physically isolated by a partition. The partition is equipped with cable through holes and electromagnetic shielding sleeves to reduce the interference of motor drive noise on the acquisition of sensitive signals.

[0046] In practical applications of this invention, at the start of testing, after the external 28V regulated DC power supply is connected to the device, the total power supply voltage display 7-1 immediately shows the actual voltage value of the input bus. The digital voltmeter is directly connected in parallel between the positive and negative terminals of the main power supply, with a range covering 0–35VDC and an accuracy better than ±1%, allowing the operator to immediately determine whether the external power supply is stable and whether the cable connection is reliable. If the voltage is abnormally low or fluctuates drastically, it can prevent blindly starting subsequent loads and prevent stepper motor step loss or vacuum pump overheating due to undervoltage. When the operator sequentially closes the pump power switch 5-5 and the turntable power switch 5-8, the pump power supply voltage display 7-2 and the turntable power supply voltage display 7-3 are activated synchronously, reflecting the actual power supply levels obtained by the micro vacuum pump and the three-axis electric turntable, respectively. For example, in high-altitude outdoor environments, if the power cable is long or the contact resistance is increased, the voltage at the turntable end may be significantly lower than that at the input end. In this case, even if the total power supply display is normal, the turntable motor will still be unable to complete large-angle rotation due to insufficient driving force. However, by displaying the turntable power supply voltage as 7-3, the operator can promptly detect such hidden faults and take measures such as replacing the cable or finding a nearby power source to ensure the effectiveness of the test.

[0047] During attitude adjustment, the operator directly controls the yaw control switch 5-9, pitch control switch 5-10, and roll control switch 5-11 on the panel. The switches employ a dual-position self-resetting mechanical structure. Pressing the left contact activates the forward rotation circuit of the corresponding axis stepper motor, while pressing the right contact activates the reverse rotation circuit. Releasing the contacts automatically returns them to the neutral position, cutting off power to the motors, allowing the operator to fine-tune using muscle memory. For example, when calibrating the combined measurement unit to zero, a light press of the pitch switch slowly raises the Z-axis to the horizontal reference plane; or during simulated roll maneuvers, continuously pressing the roll switch for several seconds observes whether the display response is synchronized. Because each axis motor is directly connected to its corresponding switch via an independent drive circuit, the control path is extremely short, the response delay is almost zero, and there is no software intermediary layer, improving operational certainty and safety. This makes it particularly suitable for field or emergency maintenance scenarios without computer assistance.

[0048] However, the frequent start-stop cycles of high-power stepper motors inevitably generate high-frequency current pulses and electromagnetic radiation. If not suppressed, these can easily couple to nearby RS422 and HB6096 low-level differential signal lines, causing data errors or even communication interruptions. To address this, the device implements systematic electromagnetic compatibility (EMC) at the structural level: the entire casing is made of high-strength engineering plastic, combining lightweight (only 1.85kg) with good insulation, and an internal aluminum alloy frame is embedded to improve rigidity and shielding effectiveness; more importantly, a metal partition completely physically isolates the turntable area from the simulation test area inside the enclosure—the former houses the three-axis electric turntable and its drive circuit, belonging to the "high-voltage / power area"; the latter centrally houses the micro pump, signal interface, bus simulation circuit, and docking sockets, belonging to the "low-voltage / sensitive area". All cables crossing the partition (including power lines, control lines, and a few necessary signal lines) pass through dedicated vias, and conductive rubber bushings or metal braided electromagnetic shielding sleeves are installed inside the vias. The two ends of the sleeves overlap the partition and the cable shielding layer 360° respectively, forming a continuous Faraday cage effect.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A portable testing device for backup instruments, characterized in that, include: This includes the enclosure structure, turntable area, and simulation testing area; The box structure is equipped with four sets of self-locking rollers at the bottom and a retractable pull rod on the side; The turntable area is located on one side inside the housing and has a built-in three-axis electric turntable (1-1). The three-axis electric turntable (1-1) consists of an X-axis, a Y-axis and a Z-axis. Each axis is equipped with a reducer and a stepper motor. The Z-axis in the pitch direction is a telescopic structure, and its axial length can be changed by manual adjustment. The simulation test area is located on the other side of the enclosure, and contains a micro pump, a pneumatic pipeline system, electrical wiring, and multiple control switches and signal interfaces. The micro pump is connected to the static pressure hose and the full pressure hose via a three-way interface. The static pressure hose is connected to the static pressure port via a static pressure control valve, and the full pressure hose is connected to the full pressure port via a full pressure control valve. The static pressure port and the full pressure port are used to connect to the corresponding sensor interfaces of the measured combination unit to simulate the negative pressure environment corresponding to an altitude of up to 11,000 meters. The electrical circuit is connected to a unified 28VDC power supply interface, which includes 28V input (+) (6-1), 28V input (-) (6-2), 28V input spare (+) (6-3) and 28V input spare (-) (6-4), which are used to provide working power for the three-axis electric rotary table (1-1), the micro pump and the object under test; The control switches include a main power switch (4-1), a lighting power switch (5-1), a magnetic sensor power switch (5-2), a combined measurement unit power switch (5-3), a display unit power switch (5-4), a pump power switch (5-5), a total pressure control switch (5-6), a static pressure control switch (5-7), a turntable power switch (5-8), a heading control switch (5-9), a pitch control switch (5-10), and a roll control switch (5-11). Each switch is electrically connected to the wiring terminal of the corresponding electrical component. The signal interface includes a strapdown magnetic sensor docking socket (2-1), a combined measurement unit docking socket (2-2), and a display unit docking socket (2-3), which are used to establish a physical connection with the object under test and transmit data; The simulation test area is also equipped with eight RS422 or HB6096 bus simulation / acquisition interfaces, namely Compass 429 Simulation (A) (6-5) and Compass 429 Simulation (B) (6-6), Atmosphere 422 Simulation / Acquisition (A) (6-7) and Atmosphere 422 Simulation / Acquisition (B) (6-8), Attitude 422 Simulation / Acquisition (A) (6-9) and Attitude 422 Simulation / Acquisition (B) (6-10), and Heading / Magnetic Field 422 Simulation / Acquisition (A) (6-11) and Heading / Magnetic Field 422 Simulation / Acquisition (B) (6-12), for connecting external bus instruments to provide or acquire corresponding bus signals; The enclosure panel is also equipped with a total power voltage display (7-1), a pump power voltage display (7-2), and a turntable power voltage display (7-3) for real-time monitoring of the power supply status of each key component.

2. The portable testing device for backup instruments according to claim 1, characterized in that, The three-axis electric turntable (1-1) is made of carbon fiber composite material. Its X-axis, Y-axis and Z-axis are arranged orthogonally to each other. The Z-axis is set in the vertical direction and has an axial telescopic mechanism. The telescopic mechanism allows the user to compress the Z-axis when the device is not in operation, so as to reduce the overall height of the turntable. When testing is required, the Z-axis can be pulled out to a predetermined length to provide sufficient installation space for fixing the combined measurement unit.

3. The portable testing device for backup instruments according to claim 1, characterized in that, The micro pump is a diaphragm vacuum pump, whose maximum pumping capacity corresponds to the static pressure value at an altitude of 11,000 meters under standard atmospheric pressure. The pump outlet leads out to the first branch and the second branch through a rigid tee connector. The first branch is connected to the total pressure port (3-1) via the total pressure control valve, and the second branch is connected to the static pressure port (3-2) via the static pressure control valve. Both control valves are normally closed electromagnetic shut-off valves, which are independently controlled by the total pressure control switch (5-6) and the static pressure control switch (5-7).

4. The portable testing device for backup instruments according to claim 1, characterized in that, The 28VDC power supply interface is located on the rear panel of the enclosure, including 28V input (+) (6-1), 28V input (-) (6-2), 28V input spare (+) (6-3) and 28V input spare (-) (6-4), which are arranged in a rectangle. They are all connected to the power distribution network after the main power switch (4-1) through internal busbars, and then distributed to the corresponding loads through the respective functional power switches. Among them, the turntable power switch (5-8) controls the power supply path of the three-axis stepper motor, and the pump power switch (5-5) controls the power supply path of the micro pump.

5. The portable testing device for backup instruments according to claim 1, characterized in that, The front panel of the enclosure is equipped with docking sockets in the middle area, including three independent sockets: the strapdown magnetic sensor docking socket (2-1) is located on the left, the combined measurement unit docking socket (2-2) is located in the center, and the display unit docking socket (2-3) is located on the right. The strapdown magnetic sensor docking socket (2-1) is also equipped with a pitch motor socket (2-4) on one side. Each socket is connected to the corresponding signal processing circuit inside through shielded cables and forms a signal path with the corresponding simulation / acquisition interface.

6. The portable testing device for backup instruments according to claim 1, characterized in that, The eight sets of bus simulation / acquisition interfaces are symmetrically arranged in the upper right area of ​​the front panel of the enclosure. Among them, the compass 429 simulation (A) (6-5) and compass 429 simulation (B) (6-6) are a pair of differential HB6096 bus terminals, used to connect an external HB6096 bus instrument to simulate radio compass output; the atmosphere 422 simulation / acquisition (A) (6-7) and atmosphere 422 simulation / acquisition (B) (6-8) are a pair of RS422 differential terminals, used to inject simulated atmospheric data into the display unit or acquire its output when there is no combined measurement unit. Attitude 422 Simulation / Acquisition (A) (6-9) and Attitude 422 Simulation / Acquisition (B) (6-10) are another pair of RS422 terminals used to inject or acquire attitude data; Heading / Magnetic Field 422 Simulation / Acquisition (A) (6-11) and Heading / Magnetic Field 422 Simulation / Acquisition (B) (6-12) are a third pair of RS422 terminals used to replace strapdown magnetic sensors to provide heading or magnetic field simulation signals.

7. The portable testing device for backup instruments according to claim 1, characterized in that, The lower left area of ​​the front panel of the enclosure is equipped with a control switch assembly, and a lighting power switch assembly is located on one side of the control switch assembly. The switches are arranged according to their functions: the top row consists of the main power switch (4-1) and the lighting power switch (5-1); the middle row consists of the magnetic sensor power switch (5-2), the combined measurement unit power switch (5-3), the display unit power switch (5-4), and the pump power switch (5-5) from left to right; the bottom row consists of the full pressure control switch (5-6), the static pressure control switch (5-7), the turntable power switch (5-8), the heading control switch (5-9), the pitch control switch (5-10), the roll control switch (5-11), and the spare switch (5-12) from left to right. Each switch is a rocker-type mechanical switch with an indicator light, and its contacts are directly connected in series in the power supply circuit of the corresponding load.

8. The portable testing device for backup instruments according to claim 1, characterized in that, The lower right area of ​​the front panel of the housing is provided with a display component, which includes three digital voltmeters. The total power supply voltage display (7-1) is connected in parallel between the 28V input (+) (6-1) and the 28V input (-) (6-2). The pump power supply voltage display (7-2) is connected in parallel to the output terminal of the pump power switch (5-5). The turntable power supply voltage display (7-3) is connected in parallel to the output terminal of the turntable power switch (5-8).

9. The portable testing device for backup instruments according to claim 1, characterized in that, The X-axis, Y-axis and Z-axis stepper motors of the three-axis electric turntable (1-1) are connected to the heading control switch (5-9), pitch control switch (5-10) and roll control switch (5-11) through independent drive circuits. Each control switch is a two-position self-resetting type. When operating, pressing the corresponding direction will connect the forward or reverse rotation circuit of the axis motor, and releasing it will automatically cut off the power, realizing manual attitude adjustment.

10. The portable testing device for backup instruments according to claim 1, characterized in that, The outer shell of the enclosure is made of high-strength engineering plastic and aluminum alloy frame composite structure. The internal turntable area and simulation test area are physically isolated by a partition. The partition is equipped with cable through holes and electromagnetic shielding sleeves to reduce the interference of motor drive noise on the acquisition of sensitive signals.

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