Signal test tool

Abstract

The utility model provides a signal test tool. The structure of the tool comprises a housing, a battery compartment, an intelligent control mainboard, a liquid crystal display module and a button. A display screen of the liquid crystal display module is arranged on the surface of the shell, and the keys are arranged on the surface of the shell and on the right side of the display screen; the intelligent control mainboard is arranged in the shell; and the battery compartment is arranged at the lower part of the shell. According to the utility model, the real signal receiving condition of the NB Internet of Things membrane meter can be simulated, external equipment does not need to be connected, and network searching signal detection can be completed manually and immediately and displayed on a liquid crystal screen.

Description

Technical Field

[0001] This utility model relates to the field of signal testing technology, and specifically provides a signal testing fixture. Background Technology

[0002] The remote meter reading system collects and measures gas consumption via remote gas meters. During data collection, the collector gathers gas data through the meter head collector, RS485, and MBUS bus in the remote meter, processes and stores the data, and then uploads it to the concentrator via a wireless data transmission module. The concentrator's main function is to collect the data uploaded by each collector and then upload it to the meter reading system's monitoring center via GPRS and CDMA. When meter reading is required, the computer at the monitoring center issues a collection command. Upon receiving the command, the collector forwards it to all collectors. The meter head collector, upon receiving the command, determines whether it is a command intended for a terminal and sends the data stored on the meter head collector back to the monitoring center, thus achieving remote meter reading.

[0003] The signal testing fixture transmits China Telecom, China Unicom, or China Mobile signals. The signals connect to the mobile / telecom operator's network via a China Telecom, China Unicom, or China Mobile NB-IoT base station. During the network connection process, the signal condition can be analyzed based on the RSRP, SNR, and ECL values ​​returned by the operator's network.

[0004] RSRP (Signal Received Power): All values ​​are negative, ranging from -44 to -140 dBm. The higher the value, the better.

[0005] SNR (Signal-to-Noise Ratio): Positive and negative values ​​are both possible, and the higher the better.

[0006] ECL (Coverage Registration): The values ​​are generally 0 (regular coverage), 1 (extended coverage), and 2 (extreme coverage).

[0007] Based on testing experience, the optimal values ​​for NB signals are: RSRP above -90, SNR above 10, and ECL of 0.

[0008] Therefore, it is evident that the strength of the telecommunications signal has a significant impact on the meter reading process, necessitating the detection of the telecommunications signal strength at the location of the remote gas meter. Utility Model Content

[0009] The technical objective of this invention is to provide a signal testing fixture to address the aforementioned problems.

[0010] A signal testing fixture, the fixture comprising a housing, a battery compartment, a smart control motherboard, a liquid crystal display module, and buttons;

[0011] The display screen of the liquid crystal display module is disposed on the surface of the housing, and the buttons are disposed on the surface of the housing, on the right side of the display screen;

[0012] The intelligent control motherboard is located inside the casing;

[0013] The battery compartment is located at the bottom of the outer casing.

[0014] Furthermore, the intelligent control motherboard includes an NB communication circuit, an MCU microcontroller, and a voltage conversion module;

[0015] The NB communication circuit includes an NB IoT communication module, a SIM card, and an antenna;

[0016] The battery installed in the battery compartment is connected to the MCU microcontroller, NB IoT communication module, SIM card and LCD display module through a voltage conversion module to provide power to them.

[0017] The intelligent control motherboard is equipped with an NB communication circuit, an MCU microcontroller, and a voltage conversion module.

[0018] The NB communication circuit includes an NB IoT communication module, a SIM card, and an antenna;

[0019] The rechargeable lithium battery is connected to the MCU microcontroller, NB IoT communication module, SIM card, and LCD display module respectively through a voltage conversion module to provide power to them.

[0020] Furthermore, the NB communication circuit uses the BC26 communication chip.

[0021] Furthermore, the MCU microcontroller uses the GD32E230C8T6 chip.

[0022] Furthermore, the voltage conversion module uses an SGM2019-3.3V voltage regulator chip to convert the rechargeable lithium battery voltage to 3.3V, which is then used by the MCU microcontroller, NB IoT communication module, SIM card, and LCD display module.

[0023] Furthermore, the antenna is a built-in patch antenna.

[0024] Compared with the prior art, the signal testing fixture of this utility model has the following outstanding advantages:

[0025] This invention uses the MCU on the intelligent control board of the signal detection fixture to trigger the communication unit (communication module, SIM card, antenna) to power on. After network search and detection, the data is transmitted back to the MCU and displayed on the LCD screen. This invention can simulate the real signal reception of NB IoT membrane meters. It does not require connection to external devices and can manually complete the network search signal detection in real time and display it on the LCD screen. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the signal testing fixture and base meter of this utility model;

[0027] Figure 2 This is a circuit diagram of the intelligent control motherboard;

[0028] Figure 3 This is a diagram showing the components and pinout of the peripheral circuit for the GD32E230C8T6 chip.

[0029] Figure 4 This is a diagram showing the components and pinout of the peripheral circuit of the BC26 communication chip.

[0030] Figure 5 This is a diagram showing the components and pinout of the peripheral circuit for the SGM2019-3.3V voltage regulator chip.

[0031] Figure 6 This is a side view of the signal testing fixture and base meter of this utility model. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0033] like Figure 1 , 6 As shown, a signal testing fixture includes a housing 1, a battery compartment 3, a smart control motherboard, an LCD display module, and buttons 4. The testing fixture is positioned in front of a base meter 5.

[0034] The display screen 2 of the liquid crystal display module is disposed on the surface of the housing 1, and the button 4 is disposed on the surface of the housing 1, on the right side of the display screen 2;

[0035] The intelligent control motherboard is located inside the outer casing 1;

[0036] The battery compartment is located at the lower part of the outer casing 1.

[0037] The intelligent control motherboard includes an NB communication circuit, an MCU microcontroller, and a voltage conversion module;

[0038] The NB communication circuit includes an NB IoT communication module, a SIM card, and an antenna;

[0039] The battery installed in battery compartment 3 is connected to the MCU microcontroller, NB IoT communication module, SIM card and LCD display module respectively through voltage conversion module to provide power to them.

[0040] like Figure 2 As shown, the intelligent control motherboard is equipped with an NB communication circuit, an MCU microcontroller, and a voltage conversion module;

[0041] The NB communication circuit includes an NB IoT communication module, a SIM card, and an antenna;

[0042] The rechargeable lithium battery is connected to the MCU microcontroller, NB IoT communication module, SIM card, and LCD display module respectively through a voltage conversion module to provide power to them.

[0043] like Figure 4 As shown, the NB communication circuit uses the BC26 communication chip, which is a high-performance, low-power NB-IoT wireless communication module. Due to its compact size, ultra-low power consumption and ultra-wide operating temperature range, the BC26 communication chip has become an ideal choice in the field of M2M applications. It is often used in wireless meter reading, smart cities, security, asset tracking, smart home appliances, agriculture and environmental monitoring, as well as many other industries, to provide comprehensive SMS and data transmission services.

[0044] like Figure 3 As shown, the MCU microcontroller uses the GD32E230C8T6 chip. The GD32E230C8T6 chip is a core-based 32-bit general-purpose microcontroller that provides high performance while offering high energy efficiency for MCUs and embedded applications with compact design requirements. Through its small yet powerful instruction set and extensive optimization, it provides high-end processing hardware, resulting in high energy efficiency.

[0045] like Figure 5 As shown, the voltage conversion module uses an SGM2019-3.3V voltage regulator chip to convert the battery voltage to 3.3V, which is used by the MCU microcontroller, NB IoT communication module, SIM card, and LCD display module.

[0046] The antenna is a built-in patch antenna.

[0047] The MCU on the intelligent control board of the signal detection fixture triggers the communication unit (communication module, SIM card, antenna) to power on. After network search and detection, the data is sent back to the MCU and displayed on the LCD screen.

[0048] During operation, press and hold the button for 3 seconds to trigger the gas meter to report communication. The LCD will display NONE-2 (reporting type), PD-SUCC (module powered on successfully), CSQ-SUCC (network search successful), and CN-SUCC (network attachment successful) in sequence, indicating that the signal detection is complete. The LCD will then display signal values ​​such as RSRP, SNR, and ECL.

[0049] The embodiments described above are merely preferred embodiments of this utility model. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution should be included within the protection scope of this utility model.

Claims

1. A signal testing fixture, characterized in that, The fixture structure includes a shell (1), a battery compartment (3), a smart control motherboard, a liquid crystal display module, and buttons (4); the display screen (2) of the liquid crystal display module is disposed on the surface of the shell (1), and the buttons (4) are disposed on the surface of the shell (1) and to the right of the display screen (2); the smart control motherboard is disposed inside the shell (1); the battery compartment is disposed at the lower part of the shell (1); the smart control motherboard includes an NB communication circuit, an MCU microcontroller, and a voltage conversion module; the NB communication circuit includes an NB IoT communication module, a SIM card, and an antenna; the battery installed in the battery compartment (3) is connected to the MCU microcontroller, the NB IoT communication module, the SIM card, and the liquid crystal display module respectively through the voltage conversion module to supply power to them; The NB communication circuit uses the BC26 communication chip; the MCU microcontroller uses the GD32E230C8T6 chip; the voltage conversion module uses the SGM2019-3.3V voltage regulator chip to convert the battery voltage to 3.3V for use by the MCU microcontroller, NB IoT communication module, SIM card, and LCD display module; the antenna is a built-in patch antenna; the test fixture is set in front of the base meter (5) to simulate the real signal reception of the NB IoT membrane meter.

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