Atmospheric data calibration adapter

Abstract

The utility model provides a kind of atmospheric data calibration adapter, it is related to the technical field of avionics test equipment, the utility model includes an electrical male plug and an electrical female plug, the electrical male plug with the electrical female plug is electrically connected by wire, the electrical male plug is 78 needle D-sub type electrical plug, the electrical male plug is electrically connected with the data end of GDC74 series atmospheric data computer, the electrical female plug is electrically connected with the data end of calibration computer, for carrying out the data communication transmission between GDC74 series atmospheric data computer and calibration computer, compared with prior art, by setting electrical male plug and electrical female plug, physical connection is established between GDC74 series atmospheric data computer and calibration computer end, it is convenient to calibrate GDC74 series atmospheric data computer work.

Description

Technical Field

[0001] This utility model relates to the field of avionics testing equipment technology, and in particular to an atmospheric data calibration adapter. Background Technology

[0002] The accuracy of aircraft air data measurements directly affects the accurate acquisition of parameters such as flight speed and altitude, and has a significant impact on flight safety and quality. According to the requirements of the Civil Aviation Administration of China, maintenance units should calibrate the aircraft's air data system every two years; only aircraft that have passed air data calibration are considered airworthy.

[0003] In related technologies, the GDC74 series air data computer is widely used in the general aviation field, and the accuracy of its measurement data is directly related to flight safety. However, in actual use, the Garmin-manufactured GDC74 series air data computers often fail to calibrate due to internal altitude drift and other issues. Replacing the GDC74 series air data computer directly for this reason would consume significant manpower, financial resources, and materials, while also increasing the material burden on maintenance units. Therefore, Garmin has developed a dedicated correction program to eliminate deviations caused by altitude drift during the calibration of the GDC74 series air data computer.

[0004] Currently, there is a lack of dedicated physical connection interface between the GDC74 series atmospheric data computer and the calibration computer. Existing technologies typically use converters for connection, which can lead to interface mismatch and unstable connection, causing inconvenience to on-site calibration operations and even posing a risk of equipment damage. Utility Model Content

[0005] The purpose of this application is to provide an atmospheric data calibration adapter to solve the aforementioned technical problems existing in the prior art.

[0006] This application provides an atmospheric data calibration adapter, which adopts the following technical solution:

[0007] An atmospheric data calibration adapter includes: a male electrical plug and a female electrical plug, the male electrical plug and the female electrical plug being electrically connected via a wire, the male electrical plug being a 78-pin D-sub type electrical plug, the male electrical plug being electrically connected to the data terminal of a GDC74 series atmospheric data computer, and the female electrical plug being electrically connected to the data terminal of a calibration computer, for data communication and transmission between the GDC74 series atmospheric data computer and the calibration computer.

[0008] Preferably, the electrical female plug is a 9-pin D-sub type electrical plug.

[0009] Preferably, pins 2, 3, and 5 of the female electrical plug are electrically connected to pins 14, 13, and 15 of the male electrical plug via wires.

[0010] Preferably, the remaining pins of the electrical female plug are left floating.

[0011] Preferably, it further includes a positive terminal connecting wire and a negative terminal connecting wire, wherein the first end of the positive terminal connecting wire is connected to the positive terminal of the external power supply, the second end of the positive terminal connecting wire is connected to the electrical male plug, the first end of the negative terminal connecting wire is connected to the negative terminal of the external power supply, and the second end of the negative terminal connecting wire is connected to the electrical male plug.

[0012] Preferably, the positive terminal connection line is electrically connected to pin 55 of the electrical male plug via a wire.

[0013] Preferably, the negative terminal connection wire is electrically connected to pin 17 of the electrical male plug via a wire.

[0014] Preferably, a circuit breaker is provided between the first end of the positive terminal connection line and the positive terminal of the external power supply.

[0015] Preferably, the remaining pins of the electrical male plug are left floating.

[0016] Preferably, both the first end of the positive terminal connecting wire and the first end of the negative terminal connecting wire are provided with a connector clamp.

[0017] This utility model has the following advantages and beneficial effects:

[0018] (1) This utility model establishes a physical connection between the GDC74 series atmospheric data computer and the calibration computer by setting an electrical male plug and an electrical female plug. The connection is stable and facilitates the calibration of the GDC74 series atmospheric data computer.

[0019] (2) This utility model provides overcurrent protection by setting a circuit breaker on the positive terminal connection line, which prevents the equipment from being damaged by excessive current during the calibration process and improves operational safety.

[0020] (3) This utility model achieves RS232 serial communication between the GDC74 device and the calibration computer by connecting specific pins in the electrical male plug and the electrical female plug, thus ensuring the accuracy and reliability of data transmission during the calibration process. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0023] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0024] Figure 3 This is a schematic diagram of the structure of an electrical male plug.

[0025] Figure 4 This is a schematic diagram of the structure of an electrical female plug.

[0026] Figure 5 This is a circuit diagram of the present invention.

[0027] The diagram is marked as follows:

[0028] 1. Male electrical plug; pins 11 and 14; pins 12 and 13; pins 13 and 15; pins 14 and 55; pins 15 and 17; 2. Female electrical plug; pins 21 and 2; pins 22 and 3; pins 23 and 5; 3. Positive connection wire; 4. Negative connection wire; 5. Terminal clamp; 6. Circuit breaker; 7. GDC74 series atmospheric data computer; 8. Calibration computer. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] The following is combined with Figures 1 to 5 The atmospheric data calibration adapter provided in this application will be described in detail through specific embodiments and application scenarios.

[0031] like Figure 1 and Figure 2As shown, the atmospheric data calibration adapter provided in this embodiment mainly includes an electrical male plug 1, an electrical female plug 2, a positive connection wire 3, a negative connection wire 4, and a circuit breaker 6. These components are interconnected via electrical wires and mechanical fastening, forming the main circuit framework of the adapter. The adapter is compact in size, easy to carry and operate / install in confined aircraft maintenance bays, and also facilitates future maintenance and replacement.

[0032] like Figure 3 As shown, the electrical male plug 1 is used for electrical connection with the data interface of the GDC74 series air data computer 7. Specifically, the GDC74 series air data computer 7 generally uses a 78-pin D-sub type electrical socket female structure as its data interface. This interface has a high pin density and multi-channel data transmission capability to meet the measurement needs of multiple parameters and large data volumes. Based on this, the electrical male plug 1 in the adapter is a 78-pin D-sub type electrical plug male plug that matches the standard, enabling direct plug-in mating with the physical interface of the GDC74 series air data computer 7.

[0033] This one-to-one interface design ensures consistency in pin arrangement, pin pitch, electrical contact depth, and positioning hole height, avoiding physical misalignment and insertion / removal difficulties caused by different pin arrangements or accumulated pin pitch tolerances when using general-purpose data cables or adapters. Simultaneously, this dedicated interface provides superior mechanical holding force and vibration resistance, adapting to the shaking and micro-vibration environments that may exist in aircraft maintenance sites, and helping to maintain a stable electrical connection throughout the calibration and data correction process.

[0034] Furthermore, the male electrical plug 1 fully utilizes the unique dual-side locking screw design of the 78-pin D-sub interface during insertion and removal. By tightening the screws, the male and female plugs are firmly secured, further enhancing resistance to pull-out force and lateral shear force, and preventing instantaneous wire breakage or signal jitter caused by plug movement under force. This mechanical locking function is particularly important in maintenance and calibration scenarios involving repeated insertion and removal, reducing increased contact resistance caused by loosening and extending the overall service life of the interface terminals and socket.

[0035] Furthermore, the adapter's use of a 78-pin D-sub male electrical plug avoids the cumbersome process of connecting multiple individual jumpers to different terminals, significantly improving the convenience and safety of field wiring and reducing the risk of incorrect pin connections, short circuits, or loose connections. This structured and modular design helps standardize the calibration process, reduces operator errors caused by temporary wiring, and effectively ensures the stability and reliability of data communication during the calibration process of the GDC74 series atmospheric data computer.

[0036] like Figure 4 and Figure 5 As shown, the electrical female connector 2 is used to connect to the serial communication interface of the calibration computer 8, which performs atmospheric data calibration and drift correction procedures. The calibration computer 8 is typically equipped with a 9-pin D-sub type serial communication interface male connector; therefore, the electrical female connector 2 used in this embodiment is a 9-pin D-sub type female connector, which can directly form a reliable plug-in connection with the serial port of the calibration computer 8. This interface type allows for quick physical connection without altering the original communication port of the calibration computer 8, reducing on-site modification and temporary wiring work.

[0037] Furthermore, the internal pins of the electrical female connector 2 are functionally assigned according to the RS232 standard communication protocol. Specifically, pin 21 of the 9-pin D-sub type electrical female connector is defined as the receive data pin (RXD), mainly used to receive data signals transmitted from the calibration computer 8, realizing real-time reception of data from calibration software or operation commands; pin 32 is defined as the transmit data pin (TXD), used to transmit data information collected or transmitted back from the GDC74 series atmospheric data computer 7 to the calibration computer 8 through the electrical female connector 2, realizing data feedback and recording; pin 523 is defined as the signal ground pin (GND), providing a stable common reference ground potential for the entire RS232 serial communication, ensuring that the signal has a relatively fixed potential reference during transmission, thereby effectively reducing communication errors and interference caused by ground potential drift or level inconsistency.

[0038] It is worth noting that, apart from pins 21 (21), 22 (22), and 23 (23) used for communication functions, all other pins in the electrical female connector 2 are left unconnected and suspended, meaning they are not connected to any wires or electrical components. This design offers several technical advantages: First, it significantly simplifies the internal wiring and soldering process, reducing assembly complexity and production costs; second, after maintenance or repeated plugging and unplugging, because the unused pins are physically disconnected, they will not cause malfunctions, accidental circuit triggering, or electrostatic discharge due to accidental contact or brief contact with other live signals, further improving the overall anti-interference capability and operational safety of the adapter.

[0039] Furthermore, by using only the necessary RS232 standard pins for functional connections and leaving the remaining pins floating, capacitive coupling effects and crosstalk interference risks can be reduced during adapter use, thus improving the stability of serial communication from a signal integrity perspective. This is particularly crucial for the highly reliable transmission of large amounts of small-amplitude digital data during calibration, helping to ensure high-precision data exchange between the GDC74 series atmospheric data computer 7 and the calibration computer 8.

[0040] like Figures 3 to 5 Further illustrating, the electrical male plug 1 and electrical female plug 2 are electrically connected via several wires. Specifically, pin 11 of the 78-pin D-sub male plug is used as the transmit data pin (TXD), connected via a wire to pin 21 (RXD) of the 9-pin D-sub female plug, for transmitting data from the atmospheric data computer to the calibration computer 8; pin 12 of the 78-pin D-sub male plug is used as the receive data pin (RXD), connected via a wire to pin 22 (TXD) of the female plug 2, for receiving data from the calibration computer 8; pin 13 of the 78-pin D-sub female plug is used as the receive data pin (RXD), connected via a wire to pin 22 (TXD) of the female plug 2, for receiving data from the calibration computer 8; pin 13 of the 78-pin D-sub female plug is the signal ground (GND), connected to pin 23 of the female plug 2, to form a complete communication reference level. This point-to-point wiring, corresponding to the standard RS232 signal allocation, ensures the correctness of data transmission and anti-interference performance, thus meeting the stringent requirements for communication stability in calibration scenarios.

[0041] like Figures 1 to 5 As shown, to meet the power requirements for the normal operation of the GDC74 series air data computer 7, the adapter is also equipped with a positive connection wire 3 and a negative connection wire 4. The first end of the positive connection wire 3 is detachably connected to the positive terminal of an external 28V DC power supply via a connector 5, and the second end is connected via a wire to pin 14 of electrical male connector 1 (pin 55), providing a regulated positive DC voltage input to the GDC74 series air data computer 7. Similarly, the first end of the negative connection wire 4 is connected via a connector 5 to the grounding terminal commonly used in aircraft maintenance yards or the negative terminal of a 28V power supply, and the second end is electrically connected to pin 15 of electrical male connector 1 (pin 17), forming a DC power supply loop. This structure ensures that the air data computer can operate with independent ground power supply and avoids the safety risks associated with repeatedly disassembling the aircraft's internal power supply wiring harness.

[0042] To further improve the system's operational security, such as Figure 1 and Figure 5 As shown, a circuit breaker 6 with a rated current of 5A is connected in series on the positive connection line 3. Specifically, the circuit breaker 6 can be a small, thermally protected automatic circuit breaker commonly used in aviation, such as the TYCO / TECML series or ABB / S800 series, which features small size, fast response, and high reliability, and can adapt to the harsh temperature and vibration environment of aircraft maintenance sites. The circuit breaker 6 is electrically connected to the line leading from the external 28V DC power supply on the positive connection line 3 through its input terminal, and its output terminal is connected to pin 14 of electrical male connector 1 through a wire, providing a controlled positive voltage input to the GDC74 series air data computer 7.

[0043] Circuit breaker 6 will quickly trip and automatically disconnect the circuit when an abnormal overcurrent occurs (e.g., exceeding 5A), preventing excessive operating current from continuing to flow. This avoids damage to the internal circuit modules of the GDC74 series atmospheric data computer 7, or damage to the adapter's own wires and contact points, caused by sudden short circuits or equipment failures leading to abnormal current. It is worth noting that after circuit breaker 6 trips, the circuit can be reclosed by mechanically resetting the lever of circuit breaker 6 after the abnormal fault source has been eliminated. This avoids the material consumption and maintenance inconvenience caused by frequent fuse replacements, improving on-site emergency response efficiency.

[0044] Furthermore, the use of circuit breaker 6 also provides certain auxiliary functions for circuit debugging and short-circuit troubleshooting. When maintenance personnel connect the power supply and load for the first time for debugging, if there are potential hazards such as reversed wiring or pin short circuits, circuit breaker 6 can be triggered to disconnect in a short time, significantly reducing the potential risk of damage when the equipment is first connected, thereby ensuring the smooth and safe calibration of the subsequent GDC74 series atmospheric data computer 7.

[0045] In practical use, the workflow of this embodiment is as follows: First, connect the male electrical connector 1 to the 78-pin D-sub female connector of the GDC74 series atmospheric data computer 7, and connect the female electrical connector 2 to the 9-pin D-sub male connector of the calibration computer 8. Then, connect the positive terminal 3 to the positive terminal of the 28V DC power supply and the negative terminal 4 to the ground point through the connector clip 5. After completing the above connections, the adapter can establish an RS232 serial communication channel between the GDC74 series atmospheric data computer 7 and the calibration computer 8, ensuring a correct power supply. This ensures that the calibration computer 8 can perform status detection, drift correction, and calibration data write-back operations on the atmospheric data computer. The entire calibration process is simple and efficient, avoiding the risks caused by cumbersome jumpers and mismatches on-site, and significantly improving work efficiency and equipment safety.

[0046] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. An atmospheric data calibration adapter, characterized in that, include: An electrical male plug (1) and an electrical female plug (2) are provided. The electrical male plug (1) and the electrical female plug (2) are electrically connected by a wire. The electrical male plug (1) is a 78-pin D-sub type electrical plug. The electrical male plug (1) is electrically connected to the data terminal of the GDC74 series atmospheric data computer (7). The electrical female plug (2) is electrically connected to the data terminal of the calibration computer (8). This is used for data communication and transmission between the GDC74 series atmospheric data computer (7) and the calibration computer (8).

2. An atmospheric data calibration adapter according to claim 1, characterized in that, The electrical female plug (2) is a 9-pin D-sub type electrical plug.

3. An atmospheric data calibration adapter according to claim 2, characterized in that, The pins 2 (21), 3 (22), and 5 (23) of the female electrical plug (2) are electrically connected to the pins 14 (11), 13 (12), and 15 (13) of the male electrical plug (1) via wires.

4. An atmospheric data calibration adapter according to claim 3, characterized in that, The remaining pins of the electrical female plug (2) are left floating.

5. An atmospheric data calibration adapter according to claim 3, characterized in that, It also includes a positive terminal connecting wire (3) and a negative terminal connecting wire (4). The first end of the positive terminal connecting wire (3) is connected to the positive terminal of the external power supply, and the second end of the positive terminal connecting wire (3) is connected to the electrical male plug (1). The first end of the negative terminal connecting wire (4) is connected to the negative terminal of the external power supply, and the second end of the negative terminal connecting wire (4) is connected to the electrical male plug (1).

6. An atmospheric data calibration adapter according to claim 5, characterized in that, The positive terminal connection line (3) is electrically connected to pin 55 (14) of the electrical male plug (1) via a wire.

7. An atmospheric data calibration adapter according to claim 6, characterized in that, The negative terminal connection line (4) is electrically connected to pin 17 (15) of the electrical male plug (1) via a wire.

8. An atmospheric data calibration adapter according to claim 5, characterized in that, A circuit breaker (6) is provided between the first end of the positive connection line (3) and the positive terminal of the external power supply.

9. An atmospheric data calibration adapter according to claim 7, characterized in that, The remaining pins of the electrical male plug (1) are left floating.

10. An atmospheric data calibration adapter according to claim 5, characterized in that, Both the first end of the positive terminal connecting line (3) and the first end of the negative terminal connecting line (4) are provided with a connector (5).

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