CN112583505B - Handheld Internet of things signal analyzer with equipment debugging function - Google Patents
Handheld Internet of things signal analyzer with equipment debugging function Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
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Abstract
The invention discloses a handheld Internet of things signal analyzer with a device debugging function, and mainly solves the problem that in the prior art, the signal analyzer can only test a single operator and has no direct communication function with Internet of things devices. The signal analyzer comprises a main control MCU for detecting NB-IOT signals, and a PCB carrier wave calculation antenna circuit, an infrared emission and receiving amplifying circuit, an LCD screen display circuit, a Bluetooth communication module, a key control circuit and a 3-path SIM card communication circuit which are all connected with the main control MCU; the SIM card communication circuit comprises an intelligent SIM logic switch, an SIM card seat and an SIM card chip which are connected with the main control MCU. Through the design, the invention can simultaneously inquire the signal intensity of three operators of mobile, communication and telecom, so that the analyzer can directly communicate with the intelligent water meter and other equipment. The signal intensity of three operators of mobile, communication and telecom can be inquired without changing the machine and the card, and the parameters of the equipment of the Internet of things can be configured and modified.
Description
Technical Field
The invention relates to an Internet of things signal analyzer, in particular to a handheld Internet of things signal analyzer with a device debugging function.
Background
Today, the technology of the internet of things is mature, and a large number of products of the internet of things are emerging from the market. Intelligent devices such as an electric meter and a water meter of the internet of things enter the field of view of people, are closely related to the life of common people, want to report and receive data remotely through a network, leave out NB-IOT signals, generally, constructors need to detect the intensity of the NB-IOT signals at the current position when installing the devices, judge whether the installation requirements are met, and the existing NB-IOT signal analyzers on the market have single functions: only one operator signal can be detected; portable difference: the volume is huge, and the carrying is not easy; complicated operation: the constructor needs professional training to use. .
Disclosure of Invention
The invention aims to provide a handheld Internet of things signal analyzer with a device debugging function, which mainly solves the problem that in the prior art, the signal analyzer can only test a single operator and has no direct communication function with Internet of things devices.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
A handheld Internet of things signal analyzer with a device debugging function comprises a main control MCU for detecting NB-IOT signals, and a PCB carrier wave calculation antenna circuit, an infrared emission and receiving amplification circuit, an LCD screen display circuit, a Bluetooth communication module, a key control circuit and a 3-way SIM card communication circuit which are all connected with the main control MCU; the SIM card communication circuit comprises an intelligent SIM logic switch, an SIM card seat and an SIM card chip which are connected with the main control MCU; the SIM logic switch comprises a chip U2 with the model of SN74CBTLV3125D-SOIC14, a capacitor C25, a resistor R22, a resistor R20, and capacitors C15, C16 and C17, wherein one end of the capacitor C25 is connected with the 14 th pin of the chip U2 and the other end of the capacitor C is grounded, one end of the resistor R22 is connected with the VCC pin of the chip U2, one end of the resistor R20 is connected with the other end of the resistor R22 and the other end of the resistor R20 is connected with the master MCU, and one end of the resistor R20 is correspondingly connected with the 5 th pin, the 9 th pin and the 12 th pin of the chip U2; other pins of the chip U2 are connected with functional pins corresponding to the main control MCU.
Further, the model of the master MCU is CTM203.
Further, the PCB carrier wave calculation antenna circuit includes a capacitor C5 and a resistor R6 connected to the nb_ant pin of the main control MCU, a capacitor C1 and a capacitor C12 connected to the other end of the resistor R6, and a connection interface CON1, a resistor R21 and a resistor R11 connected to the other end of the capacitor C12 after being connected in parallel, a resistor R5 and a resistor R34 connected to the other end of the capacitor C12 after being connected in parallel, a resistor R33 and a resistor R18 connected to the other end of the resistor R21 and the resistor R11 after being connected in parallel, and a capacitor C35 connected to the other end of the resistor R33 and the resistor R18 after being connected in parallel and the other end of the resistor C35 connected to the ground; the other end of the capacitor C5, the other end of the capacitor C1 and the other two interfaces of the connection interface CON1 are grounded; the other end of the parallel resistors R5 and R34 is connected with the common end of the capacitor C35, the resistor R33 and the resistor R18.
Further, the infrared emission and receiving amplifying circuit comprises a resistor R40 connected with a VBAT_NB pin of the master control MCU, a triode Q4 with a collector connected with the other end of the resistor R40, a resistor R39 with one end connected with the other end of the resistor R39 and the other end connected with an emitter of the triode Q4, a resistor R43 with one end connected with the emitter of the triode Q4 and the other end grounded, a triode Q5 with a collector connected with a common end of the resistor R39 and the resistor R41, a resistor R38 connected with a base of the triode Q5, a diode D2 with a cathode connected with the other end of the resistor R38, a capacitor C8 with one end connected with the other end grounded, a triode Q3 with a collector connected with the cathode of the diode D2 and the emitter grounded, and a resistor R37 connected with the base of the triode Q3; the collector and emitter of the triode Q4 are correspondingly connected with an IR_RX pin and an IR_SEL pin of the main control MCU respectively, the common end of the resistor R35 and the capacitor C8 and the emitter of the triode Q5 are connected with a VBAT_NB pin of the main control MCU, and the other end of the resistor R37 is connected with an IR_TX pin of the main control MCU.
Further, the LCD screen display circuit includes a MOS tube U1 with a source connected to the vbat_nb pin of the main control MCU, a capacitor C29 with one end connected to the source of the MOS tube U1 and the other end grounded, a resistor R32 with one end connected to the source of the MOS tube U1 and the other end connected to the gate of the MOS tube U1 after being connected in parallel, a capacitor C30, a resistor R27 connected between the source and the drain of the MOS tube U1, a capacitor C28 with one end connected to the drain of the MOS tube U1 and the other end grounded, a resistor R31 connected to the gate of the MOS tube U1, a triode Q2 with a collector connected to the other end of the resistor R31 and an emitter grounded, a resistor R30 with one end connected to the base of the triode Q2 and the other end connected to the pin of the lcd_en of the main control MCU, and an LCD screen with a5 th pin connected to the drain of the MOS tube U1; the 7 th to 12 th pins of the LCD screen are respectively connected with the VDD_LCD, SPI_SCK, SPI_ SDI, RS, VCD _RST and CS pins of the main control MCU, and the 5 th pin of the LCD screen is also connected with the VDD_LCD of the main control MCU.
Further, the key control circuit comprises a socket interface J5, resistors R17, R19, R23, R24 and R25 which are respectively connected with pins 1-5 of the socket interface J5, and a capacitor C6 and a resistor R4 which are respectively connected with the other ends of the resistors R17, R19, R23, R24 and R25; the other end of the resistor R4 is connected with the VBAT_NB pin of the main control MCU, the other end of the capacitor C6 is grounded, and the common end of the capacitor C6 and the resistor R4 is connected with the BUTTON_ADC pin of the main control MCU.
Further, the buzzer circuit further comprises a buzzer circuit connected with the main control MCU, the buzzer circuit comprises a resistor R28 connected with a VBAT_NB pin of the main control MCU, a buzzer B1 connected with the other end of the resistor R28, a diode D1 connected in parallel with two ends of the buzzer B1, a triode Q1 with a collector connected with the other end of the buzzer B1 and an emitter grounded, and a resistor R29 with one end connected with a base of the triode Q1 and the other end connected with a BZZ_ON pin of the main control MCU.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention solves the problems of single function and poor compatibility of the traditional NB-IOT signal analyzer by integrating 3 paths of SIM card communication circuits. The signal intensity of three operators of mobile, communication and telecommunication can be queried simultaneously, so that the analyzer can be directly communicated with the intelligent water meter and other devices. The signal intensity of three operators of mobile, communication and telecom can be inquired without changing the machine and the card, and the parameters of the equipment of the Internet of things can be configured and modified.
(2) The invention has small volume, convenient carrying and adopts the NB module with low power consumption, and the single machine can detect the signals of three operators and can acquire and display the signal intensity values in real time. The device can also establish communication with devices such as an intelligent water meter and the like through the infrared probe to configure various parameters, so that the efficiency of installation and debugging of staff is greatly improved.
Drawings
Fig. 1 is a schematic diagram of the outline structure of a signal analyzer according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a master MCU according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a bluetooth communication module according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a PCB carrier-computing antenna in an embodiment of the invention.
Fig. 5 is a circuit diagram of an LCD screen display according to an embodiment of the present invention.
Fig. 6 is a circuit diagram of infrared transmitting and receiving amplification in an embodiment of the invention.
Fig. 7 is a circuit diagram of a key control according to an embodiment of the present invention.
Fig. 8 is a buzzer circuit diagram in an embodiment of the present invention.
Fig. 9 is a diagram of a logic switch of a smart SIM of the first SIM card circuit according to an embodiment of the present invention.
Fig. 10 is a SIM card holder of a first path SIM card circuit according to an embodiment of the present invention.
Fig. 11 is a SIM card chip of a first path SIM card circuit in an embodiment of the present invention.
Fig. 12 is a diagram of a logic switch of a second SIM card communication circuit according to an embodiment of the present invention.
Fig. 13 is a SIM card holder of a second-path SIM card communication circuit according to an embodiment of the present invention.
Fig. 14 is a second SIM card chip of the second SIM card circuit in an embodiment of the present invention. FIG. 15
Fig. 15 is a diagram of a smart SIM logic switch circuit of a third SIM card circuit in an embodiment of the present invention.
Fig. 16 is a SIM card holder of a third SIM card circuit according to an embodiment of the present invention.
Fig. 17 is a SIM card chip of a third SIM card circuit in an embodiment of the present invention.
Fig. 18 is a schematic flow chart of analyzer software in the embodiment of the invention.
Detailed Description
The invention will be further illustrated by the following description and examples, which include but are not limited to the following examples.
Examples
As shown in fig. 1, the handheld internet of things signal analyzer with the equipment debugging function disclosed by the invention has an external structure which is not different from that of a common signal analyzer, an LCD screen placement area is arranged on the upper surface of a shell, a button is arranged below a screen, and a control button of a corresponding signal operator can be selected for testing when the signal intensity is detected.
Specifically, the invention is mainly aimed at improving the internal circuit of the signal analyzer, as shown in fig. 2, the analyzer circuit mainly comprises a main control MCU for detecting NB-IOT signals, and a PCB carrier wave calculation antenna circuit, an infrared emission and receiving amplifying circuit, an LCD screen display circuit, a Bluetooth communication module, a key control circuit and a 3-path SIM card communication circuit which are all connected with the main control MCU. The model of the master MCU is CTM203. The 3-path SIM card has the same circuit structure and corresponds to communication cards of 3 communication operators (mobile, unicom and telecom) commonly used in the market respectively. The bluetooth communication module is a conventional circuit module, and a specific circuit of the bluetooth communication module is shown in fig. 3.
In the invention, as shown in fig. 9-11, taking a 1-path SIM card communication circuit as an example, the SIM card communication circuit comprises an intelligent SIM logic switch, an SIM card seat and an SIM card chip which are connected with a main control MCU; the SIM logic switch comprises a chip U2 with the model of SN74CBTLV3125D-SOIC14, a capacitor C25, a resistor R22, a resistor R20, and capacitors C15, C16 and C17, wherein one end of the capacitor C25 is connected with the 14 th pin of the chip U2 and the other end of the capacitor C is grounded, one end of the resistor R22 is connected with the VCC pin of the chip U2, one end of the resistor R20 is connected with the other end of the resistor R22 and the other end of the resistor R20 is connected with the master MCU, and one end of the resistor R20 is correspondingly connected with the 5 th pin, the 9 th pin and the 12 th pin of the chip U2; the 2 nd, 3 rd, 5 th, 6 th, 8 th, 9 th, 11 th, 12 th of the chip U2 are respectively corresponding to the SIM_VDD_1 th, the SIM_VDD th, the SIM_RST_1 th, the SIM_RST, the SIM_CLK_1 th, the SIM_CLK, the SIM_IO_1 th and the SIM_DATA pins connected with the master MCU. Correspondingly, as shown in fig. 13 to 17, the 2 nd, 3 rd, 5 th, 6 th, 8 th, 9 th, 11 th and 12 th of the chip U3 in the same other two paths of SIM card communication circuits are respectively connected with the sim_vdd_2, sim_vdd, sim_rst_2, sim_rst, sim_clk_2, sim_clk, sim_io_2 and sim_data pins of the master MCU. The 2 nd, 3 rd, 5 th, 6 th, 8 th, 9 th, 11 th, 12 th of the chip U3 are respectively corresponding to the SIM_VDD_3 th, SIM_VDD, SIM_RST_3 th, SIM_RST, SIM_CLK_3 th, SIM_CLK, SIM_IO_3 th and SIM_DATA pins connected with the master MCU. Meanwhile, the SIM card holder and the SIM card chip are conventional choices.
In this embodiment, as shown in fig. 4, the PCB carrier wave calculation antenna circuit includes a capacitor C5 and a resistor R6 connected to the nb_ant pin of the master MCU, capacitors C1 and C12 connected to the other end of the resistor R6, and a connection interface CON1, resistors R21 and R11 connected to the other end of the capacitor C12 after being connected in parallel, resistors R5 and R34 connected to the other end of the capacitor C12 after being connected in parallel, resistors R33 and R18 connected to the other end of the capacitor after being connected in parallel, and a capacitor C35 connected to the other end of the capacitor after being connected in parallel with the resistors R33 and R18 and the other end of the capacitor being grounded; the other end of the capacitor C5, the other end of the capacitor C1 and the other two interfaces of the connection interface CON1 are grounded; the other end of the parallel resistors R5 and R34 is connected with the common end of the capacitor C35, the resistor R33 and the resistor R18.
In this embodiment, as shown in fig. 6, the infrared transmitting and receiving amplifying circuit includes a resistor R40 connected to the vbat_nb pin of the master MCU, a triode Q4 with a collector connected to the other end of the resistor R40, a resistor R39 connected to the base of the triode Q4, a resistor R41 with one end connected to the other end of the resistor R39 and the other end connected to the emitter of the triode Q4, a resistor R43 with one end connected to the emitter of the triode Q4 and the other end grounded, a triode Q5 with a collector connected to the common end of the resistor R39 and the resistor R41, a resistor R38 connected to the base of the triode Q5, a diode D2 with a negative electrode connected to the other end of the resistor R38, a capacitor C8 with one end connected to the other end of the resistor R35 and the other end grounded, a triode Q3 with a collector connected to the negative electrode of the diode D2 and the emitter grounded, and a resistor R37 connected to the base of the triode Q3; the collector and emitter of the triode Q4 are correspondingly connected with an IR_RX pin and an IR_SEL pin of the main control MCU respectively, the common end of the resistor R35 and the capacitor C8 and the emitter of the triode Q5 are connected with a VBAT_NB pin of the main control MCU, and the other end of the resistor R37 is connected with an IR_TX pin of the main control MCU.
In this embodiment, as shown in fig. 5, the LCD screen display circuit includes a MOS tube U1 with a source connected to the vbat_nb pin of the main control MCU, a capacitor C29 with one end connected to the source of the MOS tube U1 and the other end grounded, a resistor R32 with one end connected to the source of the MOS tube U1 and the other end connected to the gate of the MOS tube U1, a capacitor C30, a resistor R27 connected between the source and the drain of the MOS tube U1, a capacitor C28 with one end connected to the drain of the MOS tube U1 and the other end grounded, a resistor R31 connected to the gate of the MOS tube U1, a triode Q2 with a collector connected to the other end of the resistor R31 and an emitter grounded, a resistor R30 with one end connected to the base of the triode Q2 and the other end connected to the pin of the lcd_en of the main control MCU, and an LCD screen with a 5 th pin connected to the drain of the MOS tube U1; the 7 th to 12 th pins of the LCD screen are respectively connected with the VDD_LCD, SPI_SCK, SPI_ SDI, RS, VCD _RST and CS pins of the main control MCU, and the 5 th pin of the LCD screen is also connected with the VDD_LCD of the main control MCU.
In this embodiment, as shown in fig. 8, the buzzer circuit further includes a buzzer circuit connected to the main control MCU, the buzzer circuit includes a resistor R28 connected to the vbat_nb pin of the main control MCU, a buzzer B1 connected to the other end of the resistor R28, a diode D1 connected in parallel to two ends of the buzzer B1, a triode Q1 with a collector connected to the other end of the buzzer B1 and an emitter grounded, and a resistor R29 with one end connected to the base of the triode Q1 and the other end connected to the bzz_on pin of the main control MCU.
In this embodiment, as shown in fig. 7, the key control circuit includes a socket interface J5, resistors R17, R19, R23, R24, R25 connected to 1-5 pins of the socket interface J5, and a capacitor C6 and a resistor R4 connected to the other ends of the resistors R17, R19, R23, R24, R25, respectively; the other end of the resistor R4 is connected with the VBAT_NB pin of the main control MCU, the other end of the capacitor C6 is grounded, and the common end of the capacitor C6 and the resistor R4 is connected with the BUTTON_ADC pin of the main control MCU.
When the device is specifically used, as shown in fig. 18, each function is initialized after the device is powered on, the device is powered on with an LCD display screen through an SPI after the initialization is finished, the nearest base station is searched for, the signal intensity is detected, each item of information of the signal value is displayed on the LCD screen, a detection button enters a water meter inquiry configuration function interface, after the corresponding function is selected, the corresponding function is sent to the water meter through infrared, the water meter waits for feedback information, and each item of information such as the meter number, the water consumption, the cost, the success or failure of setting of the water meter can be obtained through analyzing the feedback information. If the device has no key operation within 1 minute, the device enters a low power consumption sleep state, and the device is awakened when the key is pressed.
Through the design, the invention solves the problems of single function and poor compatibility of the traditional NB-IOT signal analyzer. The signal intensity of three operators of mobile, communication and telecommunication can be queried simultaneously, so that the analyzer can be directly communicated with the intelligent water meter and other devices. The signal intensity of three operators of mobile, communication and telecom can be inquired without changing the machine and the card, and the parameters of the equipment of the Internet of things can be configured and modified. Therefore, the method has high use value and popularization value.
The above embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or color changes made in the main design concept and spirit of the present invention are still consistent with the present invention, and all the technical problems to be solved are included in the scope of the present invention.
Claims (1)
1. The handheld Internet of things signal analyzer with the equipment debugging function is characterized by comprising a main control MCU for detecting NB-IOT signals, and a PCB carrier wave calculation antenna circuit, an infrared emission and receiving amplification circuit, an LCD screen display circuit, a Bluetooth communication module, a key control circuit and a 3-path SIM card communication circuit which are all connected with the main control MCU; the SIM card communication circuit comprises an intelligent SIM logic switch, an SIM card seat and an SIM card chip which are connected with the main control MCU; the SIM logic switch comprises a chip U2 with the model of SN74CBTLV3125D-SOIC14, a capacitor C25, a resistor R22, a resistor R20, and capacitors C15, C16 and C17, wherein one end of the capacitor C25 is connected with the 14 th pin of the chip U2 and the other end of the capacitor C is grounded, one end of the resistor R22 is connected with the VCC pin of the chip U2, one end of the resistor R20 is connected with the other end of the resistor R22 and the other end of the resistor R20 is connected with the master MCU, and one end of the resistor R20 is correspondingly connected with the 5 th pin, the 9 th pin and the 12 th pin of the chip U2; the other pins of the chip U2 are connected with the function pins corresponding to the main control MCU; the model of the main control MCU is CTM203;
The PCB carrier wave calculation antenna circuit comprises a capacitor C5, a resistor R6, capacitors C1 and C12 and a connection interface CON1, wherein the capacitor C5 and the resistor R6 are connected with an NB_ANT pin of a main control MCU, the capacitors C1 and C12 are connected with the other end of the resistor R6, the resistors R21 and R11 are connected with the other end of the capacitor C12 after being connected in parallel, the resistors R5 and R34 are connected with the other end of the capacitor C12 after being connected in parallel, the resistors R33 and R18 are connected with the other end of the resistor R21 and R11 after being connected in parallel, and the capacitor C35 is connected with the other end of the resistor R33 and R18 after being connected in parallel and the other end of the resistor C35 is grounded; the other end of the capacitor C5, the other end of the capacitor C1 and the other two interfaces of the connection interface CON1 are grounded; the other end of the resistor R5 and the resistor R34 which are connected in parallel is connected with the common end of the capacitor C35, the resistor R33 and the resistor R18;
The infrared emission and receiving amplifying circuit comprises a resistor R40 connected with a VBAT_NB pin of the master control MCU, a triode Q4 with a collector connected with the other end of the resistor R40, a resistor R39 with one end connected with the other end of the resistor R39 and the other end connected with an emitter of the triode Q4, a resistor R43 with one end connected with the emitter of the triode Q4 and the other end grounded, a triode Q5 with a collector connected with a common end of the resistor R39 and the resistor R41, a resistor R38 connected with the base of the triode Q5, a diode D2 with a cathode connected with the other end of the resistor R38, a resistor R35 with one end connected with the other end of the resistor R35 and the other end grounded, a triode Q3 with a collector connected with the cathode of the diode D2 and the other end grounded, and a resistor R37 connected with the base of the triode Q3; the collector and emitter of the triode Q4 are correspondingly connected with an IR_RX pin and an IR_SEL pin of the main control MCU respectively, the common end of the resistor R35 and the capacitor C8 and the emitter of the triode Q5 are connected with a VBAT_NB pin of the main control MCU, and the other end of the resistor R37 is connected with an IR_TX pin of the main control MCU;
The LCD screen display circuit comprises an MOS tube U1, a capacitor C29, a resistor R32, a capacitor C30, a resistor R27, a capacitor C28, a resistor Q31, a triode Q2, a resistor R30 and an LCD screen, wherein the source of the MOS tube U1 is connected with a VBAT_NB pin of a main control MCU, one end of the MOS tube U1 is connected with the source of the MOS tube U1, the other end of the capacitor C29 is grounded, one end of the resistor R32 is connected with the source of the MOS tube U1, the other end of the resistor R30 is connected with a grid of the MOS tube U1, the resistor R27 is connected between the source and a drain of the MOS tube U1, one end of the resistor C28 is connected with the drain of the MOS tube U1, the resistor R31 is connected with the other end of the resistor R31, the triode Q2 is grounded, the resistor R30 is connected with the base of the triode Q2, the other end of the resistor R30 is connected with a pin of the LCD_EN of the main control MCU, and the 5 th pin of the LCD screen is connected with the drain of the MOS tube U1; the 7 th to 12 th pins of the LCD screen are respectively and correspondingly connected with the VDD_LCD, SPI_SCK, SPI_ SDI, RS, VCD _RST and CS pins of the main control MCU, and the 5 th pin of the LCD screen is also connected with the VDD_LCD of the main control MCU;
The key control circuit comprises a socket interface J5, resistors R17, R19, R23, R24 and R25 which are respectively connected with 1-5 pins of the socket interface J5, and a capacitor C6 and a resistor R4 which are respectively connected with the other ends of the resistors R17, R19, R23, R24 and R25; the other end of the resistor R4 is connected with a VBAT_NB pin of the main control MCU, the other end of the capacitor C6 is grounded, and the common end of the capacitor C6 and the resistor R4 is connected with a BUTTON_ADC pin of the main control MCU;
The analyzer also comprises a buzzer circuit connected with the main control MCU, the circuit comprises a resistor R28 connected with a VBAT_NB pin of the main control MCU, a buzzer B1 connected with the other end of the resistor R28, a diode D1 connected with two ends of the buzzer B1 in parallel, a triode Q1 with a collector connected with the other end of the buzzer B1 and an emitter grounded, and a resistor R29 with one end connected with a base of the triode Q1 and the other end connected with a BZZ_ON pin of the main control MCU.
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| US7350121B2 (en) * | 2004-08-13 | 2008-03-25 | Broadcom Corporation | Programmable embedded logic analyzer in an integrated circuit |
| CN110045659A (en) * | 2019-05-13 | 2019-07-23 | 东莞市众赢智能科技有限公司 | A kind of intelligent door lock control telecommunication circuit |
| CN210005660U (en) * | 2019-05-29 | 2020-01-31 | 泉州市联辉电子科技有限公司 | Power supply tester |
| CN211128205U (en) * | 2019-11-21 | 2020-07-28 | 福州物联网开放实验室有限公司 | NB-IoT network quality analyzer with double-card single-standby function |
| CN111757379A (en) * | 2020-06-18 | 2020-10-09 | 深圳一信泰质量技术有限公司 | NB-IoT radio frequency test system |
| CN111953756A (en) * | 2020-07-31 | 2020-11-17 | 南京理工大学 | Portable controlled box positioning monitoring system and method based on Internet of things technology |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN213846685U (en) * | 2020-12-29 | 2021-07-30 | 深圳市中科联合通信技术有限公司 | Handheld Internet of things signal analyzer with equipment debugging function |
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