Coaxial cable length compensation method, system, equipment and program for pretightening force measuring instrument

Abstract

The invention discloses a pre-tightening force measuring instrument coaxial cable length compensation method, system, device and program, and the method comprises the steps: transmitting a step signal to a coaxial cable when a coaxial cable compensation command transmitted by a pre-tightening force measuring instrument is received; when a return signal of the step signal is collected, a measurement result of the timing circuit is obtained; calculating the compensation time of the current measurement cable based on the return signal of the step signal and the measurement result of the timing circuit; and reporting the compensation time to a pre-tightening force measuring instrument. According to the processing scheme, a test cable does not need to be fixed, convenience is brought to use, meanwhile, due to the fact that the cable time delay is corrected, the sound time finally calculated by the pre-tightening force measuring instrument is closer to the sound time of the actual fastener to be measured, and the measuring result is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of preload measurement, and in particular to a method, system, device and program for compensating the length of a coaxial cable of a preload measuring instrument. Background Art

[0002] Preload measurement based on ultrasonic principle is widely used in the fields of fastener preload measurement, fastener shear force measurement and defect detection in key areas such as aerospace. Due to the multi-scenario installation location of fasteners, the length of the measurement cable is usually customized according to the actual usage scenario. Before using the preload measuring instrument to perform the preload measurement process, it is usually necessary to measure the cable length to accurately calculate the initial length of the fastener, so as to complete the accurate measurement of the current preload of the fastener. The specific calculation method is shown in the following formula (ignoring the influence of temperature environment):

[0003] Where: is the preload force under the current load [KN]; is the linear load factor related to the material and the bolt; is the ultrasonic flight time measurement value under the current load condition [ns]; is the ultrasonic flight time measurement value under no-load conditions [ns]; is the measured value of the ultrasonic flight time in the cable [ns].

[0004] At present, cable length compensation during preload measurement usually relies on data recording during installation. This method requires accuracy of data recording, increases the difficulty of data management, and does not have the real-time correction function of cable length compensation.

[0005] It can be seen that how to create a new coaxial cable length compensation method for preload force measuring instruments has become a goal that the industry urgently needs to improve. Summary of the invention

[0006] In view of this, an embodiment of the present disclosure provides a coaxial cable length compensation method for a preload force measuring instrument, which at least partially solves the problems existing in the prior art.

[0007] In a first aspect, an embodiment of the present disclosure provides a method for compensating the length of a coaxial cable of a preload force measuring instrument, the method comprising the following steps: When the return signal of the step signal is collected, the measurement result of the timing circuit is obtained; Calculating the compensation time of the current measurement cable based on the return signal of the step signal and the measurement result of the timing circuit; The compensation time is reported to the preload force measuring instrument.

[0008] According to a specific implementation of the embodiment of the present disclosure, the amplitude of the step signal is VCC, the frequency is 20 Hz, and the rising edge time is less than 1 ns.

[0009] According to a specific implementation of the embodiment of the present disclosure, the method further includes: The return signal of the step signal is gain-amplified by a bandpass filter with a bandwidth range of 10 MHz to 100 MHz and an 80 dB gain reverse amplifier.

[0010] According to a specific implementation of the embodiment of the present disclosure, the obtaining of the measurement result of the timing circuit includes: The transmission time of the step signal is measured; the MCU reads the 24-bit register data from the TDC-GP22, performs weighted filtering on the data, the weight of the new data is 0.2, and the filtered data is multiplied by the time calibration coefficient to obtain the sound time data; ; in, is the measured step signal transmission time; It is the register data read from TDC-GP22 after the last measurement; This is the register data read from TDC-GP22 after this measurement; is the weighted filter coefficient of register data, which is 0.2; is the time calibration factor.

[0011] In a second aspect, an embodiment of the present disclosure provides a coaxial cable length compensation system for a preload force measuring instrument, the system comprising: The signal generating module is configured to send a step signal to the coaxial cable when receiving a coaxial cable compensation command sent by the preload force measuring instrument; A timing module, configured to obtain a measurement result of a timing circuit when a return signal of a step signal is collected; A calculation module configured to calculate a compensation time of a current measurement cable based on a return signal of the step signal and a measurement result of the timing circuit; The communication module is configured to report the compensation time to the preload force measuring instrument.

[0012] In a third aspect, an embodiment of the present disclosure further provides an electronic device, the electronic device comprising: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor implements the coaxial cable length compensation method for a preload measuring instrument as described in any one of the first aspect or any one of the implementations of the first aspect.

[0013] In a fourth aspect, an embodiment of the present disclosure further provides a computer program product, comprising a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program comprises program instructions, and when the program instructions are executed by a computer, the computer executes the coaxial cable length compensation method of the preload measuring instrument in the aforementioned first aspect or any implementation of the first aspect.

[0014] The coaxial cable length compensation method of the preload force measuring instrument in the embodiment of the present disclosure does not need to rely on the recorded data during installation. The method can measure the flight time of the ultrasonic wave in the installed cable, thereby completing the cable length compensation function of the preload force measurement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0016] Figure 1 A schematic flow chart of a coaxial cable length compensation method for a preload force measuring instrument provided in an embodiment of the present disclosure; Figure 2 A schematic diagram of the principle of a coaxial cable length compensation method for a preload force measuring instrument provided in an embodiment of the present disclosure; Figure 3 A signal schematic diagram of a coaxial cable length compensation method for a preload force measuring instrument provided by an embodiment of the present disclosure; Figure 4 A schematic diagram of an embodiment of a coaxial cable length compensation method for a preload force measuring instrument provided in an embodiment of the present disclosure; Figure 5 A schematic diagram of the structure of a coaxial cable length compensation system for a preload force measuring instrument provided in an embodiment of the present disclosure; Figure 6 A schematic diagram of an electronic device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0017] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0018] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0019] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein may be implemented independently of any other aspect, and two or more of these aspects may be combined in various ways. For example, any number of aspects described herein may be used to implement a device and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein may be used to implement this device and / or practice this method.

[0020] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The drawings only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0021] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0022] In view of the above problems, the present invention designs a cable length compensation method, which does not rely on the recorded data during installation. The method can measure the flight time of ultrasound in the installed cable, thereby completing the cable length compensation function in the preload measurement process.

[0023] To achieve the above-mentioned purpose, the coaxial cable length compensation system of the preload force measuring instrument of the present invention comprises a signal switching circuit, a signal generating circuit, a signal extracting circuit, a timing circuit, a communication circuit and a control circuit.

[0024] The signal switching circuit is used to control the current signal path to work in the preload measurement function or the cable length compensation function. The signal path switching is achieved through a single-pole double-throw high-frequency relay (1GHz) K1. The normally closed end of the relay is connected to the preload measurement signal, and the normally open end is connected to the signal generating circuit.

[0025] The signal generating circuit is used to generate a fast step signal, which is a square wave signal with a frequency of 20Hz sent by the MCU processor, and is driven by the field effect transistor Q1 with high switching speed and low parasitic capacitance to output a step signal with an amplitude of VCC, a frequency of 20Hz, and a rising edge time of less than 1ns.

[0026] This method uses a square wave signal after power driving by Q1 to directly connect to the timing circuit as the starting signal of the timing circuit. The signal sent by the MCU is not used because there is a delay of the power driving circuit between the signal sent by the MCU and the signal of the cable to be tested, which is not accurate enough.

[0027] The amplitude VCC is usually +5V~+12V. If a voltage lower than +5V is used, the output signal will be weaker, the echo signal will be even weaker, and it will be difficult to collect. If a voltage higher than +12V is used, it will easily damage the cable.

[0028] The rise time is less than 1ns in order to minimize the error in signal transmission and it is also easier to achieve in engineering applications.

[0029] The signal extraction circuit is used to extract the reflected signal. The step signal generated by the above-mentioned signal generating circuit will be transmitted along the RF cable to the other end. Due to the impedance change at the other end of the RF cable, the signal will be reflected back after reaching the end point and return to the starting point. Since the reflected signal is usually less than 1mv, it is gain amplified by the signal extraction circuit composed of U1A. The circuit has a gain of 80dB and a bandwidth of 10MHz~100MHz.

[0030] The amplification circuit is mainly composed of an operational amplifier. Phase compensation capacitors are added to the feedback end and output end of the operational amplifier to reduce the time influence of the circuit on the return signal.

[0031] The timing circuit is used to measure the time domain difference between the generated signal and the reflected signal. The circuit is composed of a TDC-GP22 chip, and the time measurement resolution is 22ps. The time domain difference is twice the coaxial cable transmission time length of the measuring instrument.

[0032] The communication circuit is used for data exchange with the measuring instrument, adopts the RS232 interface form, and can complete two-way full-duplex communication with the measuring instrument.

[0033] The control circuit is used to control the above circuit functions and realize all the functions of the technical solution. It adopts Cortex-M3 embedded controller, controls the signal switching circuit through IO function, controls the signal generating circuit through PWM, controls the timing circuit through SPI, and controls the communication circuit through USART.

[0034] Figure 1 A schematic diagram of the process of a coaxial cable length compensation method for a preload force measuring instrument provided in an embodiment of the present disclosure.

[0035] like Figure 1 As shown, at step S110, when a coaxial cable compensation command sent by the preload force measuring instrument is received, a step signal is sent to the coaxial cable.

[0036] In the embodiment of the present invention, the amplitude of the step signal is VCC, the frequency is 20 Hz, and the rising edge time is less than 1 ns.

[0037] In an embodiment of the present invention, the method further comprises: performing gain amplification on the return signal of the step signal by means of a bandpass filter with a bandwidth range of 10 MHz to 100 MHz and an 80 dB gain reverse amplifier.

[0038] More specifically, the process proceeds to step S120.

[0039] At step S120 , when the return signal of the step signal is collected, the measurement result of the timing circuit is acquired.

[0040] In the embodiment of the present invention, the measurement result of the timing circuit is obtained, including: measuring the transmission time of the step signal; the MCU reads the 24-bit register data from the TDC-GP22, performs weighted filtering on the data, the weight of the new data is 0.2, and the filtered data is multiplied by the time calibration coefficient to obtain the sound time data; ; in, is the measured step signal transmission time; It is the register data read from TDC-GP22 after the last measurement; This is the register data read from TDC-GP22 after this measurement; is the weighted filter coefficient of register data, which is 0.2; is the time calibration factor.

[0041] Next, go to step S130.

[0042] At step S130 , the compensation time of the current measurement cable is calculated based on the return signal of the step signal and the measurement result of the timing circuit.

[0043] More specifically, the timing circuit calculates the transmission time of the signal, taking the time when the excitation signal is sent as T0 and the time when the reflected signal is received as T1, the transmission time of the signal in the cable is Te=T1-T0, thus completing the compensation function.

[0044] Next, go to step S140.

[0045] In step S140, the compensation time is reported to the preload force measuring instrument.

[0046] More specifically, if Figure 2 As shown, the working principle of the present invention is: MCU (Micro - Controller An IO of the microcontroller unit (MCU) is connected to the input of the signal switching circuit to control the switching of the signal path; the PWM port of the MCU is connected to the input of the signal generating circuit, and the step signal is generated by generating a fast rising edge. The step signal is injected into the measuring instrument end of the cable and propagates along the coaxial cable to the other end. When the signal reaches the other end, due to the impedance mutation, the signal will be reflected back to the starting point; the measuring instrument end of the cable is connected to the signal extraction circuit, and the above return signal is effectively extracted through the bandpass filter (bandwidth range: 10MHz~100MHz) filtering and the reverse amplifier (80dB gain) gain; the output end of the signal extraction circuit is connected to the timing circuit, and the transmission time from the generation to the extraction of the high-resolution measurement signal of TDC-GP22 is used. The MCU reads the 24-bit register data from TDC-GP22, performs weighted filtering on the data, and the weight of the new data is 0.2. After filtering, it is multiplied by the time calibration coefficient to obtain the sound time data. The MCU is connected to the TDC-GP22 chip through the SPI interface to complete the initialization, control, and reading functions of the chip; the USART interface of the MCU is connected to the communication circuit to complete the communication function.

[0047] like Figure 3 As shown, the signal transmission process of the present invention is that the excitation step signal sent by the MCU enters the signal switching circuit through the signal generating circuit, the signal path is switched to the cable length compensation path, the step signal continues to be transmitted, enters the cable to be compensated, and when it reaches the end of the cable, a reflection signal is generated due to the impedance mutation. The reflection signal returns along the cable to be compensated, passes through the signal switching circuit, and enters the signal extraction circuit. After the signal extraction circuit amplifies the signal, the signal enters the timing circuit, and the timing circuit calculates the transmission time of the signal. The excitation signal is sent out at T0, and the reflection signal is received at T1. The transmission time of the signal in the cable is Te=T1-T0, and the compensation function is completed.

[0048] like Figure 4The figure shows an application example of the present invention. The preload measuring instrument is connected to the present invention through a communication cable and a measurement signal cable, and the measurement probe is connected to the present invention through a measurement cable. The preload measuring instrument sends a coaxial cable compensation command through the communication cable to start the compensation function. After receiving the command, the present invention controls the signal switching circuit to switch to the cable compensation function and sends a trigger signal. After the return signal is collected, the present invention calculates the transmission time T of the coaxial cable through signal analysis, and then sends the time T to the preload measuring instrument through the communication cable. When the preload measuring instrument performs the preload measurement function, it is assumed that the measured acoustic time is T1, and the actual acoustic time is calculated by Tc=T1-T / 2. After adding the coaxial cable length compensation, the preload measuring instrument does not need to fix the test cable when performing the acoustic time measurement function, which brings convenience to use. At the same time, due to the correction of the cable delay, the final calculated acoustic time of the preload measuring instrument is closer to the acoustic time of the actual fastener to be tested, and the measurement result is more accurate.

[0049] Figure 5 The coaxial cable length compensation system 500 of the preload force measuring instrument provided by the present invention is shown, including a signal generating module 510 , a timing module 520 , a calculating module 530 and a communication module 540 .

[0050] The signal generating module 510 is used to send a step signal to the coaxial cable when receiving a coaxial cable compensation command sent by the preload force measuring instrument; The timing module 520 is used to obtain the measurement result of the timing circuit when the return signal of the step signal is collected; The calculation module 530 is used to calculate the compensation time of the current measurement cable based on the return signal of the step signal and the measurement result of the timing circuit; The communication module 540 is used to report the compensation time to the preload force measuring instrument.

[0051] See also Figure 6 The embodiment of the present disclosure further provides an electronic device 60, the electronic device comprising: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the coaxial cable length compensation method of the preload force measuring instrument in the aforementioned method embodiment.

[0052] The embodiment of the present disclosure also provides a non-transitory computer-readable storage medium, which stores computer instructions, and the computer instructions are used to enable the computer to execute the coaxial cable length compensation method of the preload measuring instrument in the aforementioned method embodiment.

[0053] The embodiments of the present disclosure also provide a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the coaxial cable length compensation method of the preload measuring instrument in the aforementioned method embodiment.

[0054] Reference below Figure 6 , which shows a schematic diagram of the structure of an electronic device 60 suitable for implementing the embodiment of the present disclosure. The electronic device in the embodiment of the present disclosure may include, but is not limited to, mobile terminals such as mobile phones, notebook computers, digital broadcast receivers, PDAs (personal digital assistants), PADs (tablet computers), PMPs (portable multimedia players), vehicle terminals (such as vehicle navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 6 The electronic device shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0055] like Figure 6 As shown, the electronic device 60 may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage device 608 into a random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the electronic device 60 are also stored. The processing device 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0056] Typically, the following devices may be connected to the I / O interface 605: input devices 606 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices 607 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 608 including, for example, a magnetic tape, a hard disk, etc.; and communication devices 609. The communication device 609 may allow the electronic device 60 to communicate with other devices wirelessly or by wire to exchange data. Although the electronic device 60 with various devices is shown in the figure, it should be understood that it is not required to implement or have all the devices shown. More or fewer devices may be implemented or have alternatively.

[0057] In particular, according to an embodiment of the present disclosure, the process described above with reference to the flowchart can be implemented as a computer software program. For example, an embodiment of the present disclosure includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device 609, or installed from a storage device 608, or installed from a ROM 602. When the computer program is executed by the processing device 601, the above-mentioned functions defined in the method of the embodiment of the present disclosure are executed.

[0058] It should be noted that the computer-readable medium mentioned above in the present disclosure may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a computer-readable program code. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. Computer readable signal media may also be any computer readable medium other than computer readable storage media, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0059] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0060] The computer-readable medium carries one or more programs. When the one or more programs are executed by the electronic device, the electronic device: obtains at least two Internet Protocol addresses; sends a node evaluation request including the at least two Internet Protocol addresses to a node evaluation device, wherein the node evaluation device selects an Internet Protocol address from the at least two Internet Protocol addresses and returns it; receives the Internet Protocol address returned by the node evaluation device; wherein the obtained Internet Protocol address indicates an edge node in a content distribution network.

[0061] Alternatively, the computer-readable medium carries one or more programs, and when the one or more programs are executed by the electronic device, the electronic device: receives a node evaluation request including at least two Internet Protocol addresses; selects an Internet Protocol address from the at least two Internet Protocol addresses; and returns the selected Internet Protocol address; wherein the received Internet Protocol address indicates an edge node in a content distribution network.

[0062] Computer program code for performing the operations of the present disclosure may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0063] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0064] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware. The name of a unit does not limit the unit itself in some cases. For example, the first acquisition unit may also be described as a "unit for acquiring at least two Internet Protocol addresses".

[0065] It should be understood that various parts of the present disclosure may be implemented in hardware, software, firmware or a combination thereof.

[0066] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A coaxial cable length compensation method for a preload force measuring instrument, characterized in that: The method comprises the following steps: When receiving a coaxial cable compensation command sent by the preload force measuring instrument, a step signal is sent to the coaxial cable; When the return signal of the step signal is collected, the measurement result of the timing circuit is obtained; Calculating the compensation time of the current measurement cable based on the return signal of the step signal and the measurement result of the timing circuit; The compensation time is reported to the preload force measuring instrument.

2. The coaxial cable length compensation method of the preload force measuring instrument according to claim 1 is characterized in that: The amplitude of the step signal is VCC, the frequency is 20 Hz, and the rising edge time is less than 1 ns.

3. The coaxial cable length compensation method of the preload force measuring instrument according to claim 1 is characterized in that: The method further comprises: The return signal of the step signal is gain-amplified by a bandpass filter with a bandwidth range of 10 MHz to 100 MHz and an 80 dB gain reverse amplifier.

4. The coaxial cable length compensation method of the preload force measuring instrument according to claim 1 is characterized in that: The obtaining of the measurement result of the timing circuit comprises: The transmission time of the step signal is measured; the MCU reads the 24-bit register data from the TDC-GP22, performs weighted filtering on the data, and the weight of the new data is 0.

2. After filtering, the data is multiplied by the time calibration coefficient to obtain the sound time data; ； in, is the measured step signal transmission time; It is the register data read from TDC-GP22 after the last measurement; This is the register data read from TDC-GP22 after this measurement; is the weighted filter coefficient of register data, which is 0.2; is the time calibration factor.

5. A coaxial cable length compensation system for a preload force measuring instrument, characterized in that: The system comprises: The signal generating module is configured to send a step signal to the coaxial cable when receiving a coaxial cable compensation command sent by the preload force measuring instrument; A timing module, configured to obtain a measurement result of a timing circuit when a return signal of a step signal is collected; A calculation module configured to calculate a compensation time of a current measurement cable based on a return signal of the step signal and a measurement result of the timing circuit; The communication module is configured to report the compensation time to the preload force measuring instrument.

6. An electronic device, characterized in that: The electronic device includes: at least one processor; and, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor executes the coaxial cable length compensation method of the preload force measuring instrument as described in any one of claims 1 to 4.

7. A computer program product, characterized in that The computer program product includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the coaxial cable length compensation method of the preload measuring instrument as described in any one of claims 1 to 4.

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