Universal meter line patrol instrument circuit

Abstract

The utility model discloses a universal meter line patrol instrument circuit, which comprises a universal meter circuit and a line patrol instrument circuit, and the universal meter circuit and the line patrol instrument circuit are integrated in the same physical measurement device. The universal meter circuit and the line patrol instrument circuit are integrated on the same physical hardware, but are completely independent, an independent power supply and an independent power switch are adopted, the requirement that a user has multiple testing functions by adopting one physical device is met, and carrying is convenient. Meanwhile, power supplies and power switches of the universal meter circuit and the line patrol instrument circuit are independent, so that measurement errors caused by electromagnetic interference are thoroughly avoided, and the requirements of creepage distance and safety regulation are met.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of measuring instruments, and in particular relates to a multimeter line patrol instrument circuit. BACKGROUND

[0002] A network line patrol instrument (also known as a network line finder, network cable tester, or line finder) is an electronic tool used to detect, locate, and test network cables such as network cables, telephone cables, coaxial cables, etc. It is mainly used in network wiring, troubleshooting, equipment maintenance, etc. It helps users quickly find target cables or diagnose cable faults.

[0003] A multimeter is a multifunctional electronic measuring instrument widely used in electronic, electrical, maintenance, and industrial fields. It can measure various electrical parameters such as voltage, current, resistance, etc. It is one of the essential tools for electricians and electronic engineers.

[0004] Traditional multimeter network line patrol instruments and multimeters are usually independent devices. For some engineers, carrying two sets of devices at the same time is not only inconvenient to carry, but also inconvenient to use. In order to solve this technical problem, the prior art integrates the multimeter and the network line patrol instrument into one test device. However, when the multimeter and the network line patrol instrument are integrated together, the multimeter line patrol instrument usually shares a power supply, which causes the exposed metal part of the RJ45 interface of the line patrol instrument to be connected to the internal PCB when measuring high voltage (such as 1000V), resulting in a safety hazard. At the same time, the multimeter and the line patrol instrument share the power supply and the circuit, which easily causes electromagnetic interference, function switching delay, power supply fluctuation, etc., affecting the performance and reliability of the device CONTENT OF THE INVENTION

[0005] To solve the above problems and technical defects, the application adopts the following technical solutions:

[0006] The utility model provides a kind of multimeter line patrol instrument circuit, including multimeter circuit and line patrol instrument circuit, and the multimeter circuit and the line patrol instrument circuit are integrated in one same physical measuring device.

[0007] The multimeter circuit includes a multimeter measurement circuit module, a multimeter battery voltage conversion module, a multimeter input interface module, a multimeter LCD display driving module, a multimeter backlight driving module and a multimeter buzzer module, and the multimeter circuit is turned on using an independent power switch.

[0008] The line patrol instrument circuit includes a line patrol instrument line patrol transmission and line checking module, a line patrol instrument battery voltage conversion module, a line patrol instrument line pressure checking module, a line patrol instrument LED display module and a line patrol instrument illuminating lamp driving module, and the line patrol instrument circuit is turned on using an independent power switch.

[0009] Further, the multimeter measurement circuit module is used for measuring voltage, current and resistance parameters;

[0010] The multimeter battery voltage conversion module is used for providing stable power supply;

[0011] The multimeter input interface module is used for connecting the measurement probe and receiving the input signal;

[0012] The multimeter LCD display driving module is used for driving the LCD screen to display the measurement result;

[0013] The multimeter backlight driving module is used for controlling the backlight of the LCD screen;

[0014] The multimeter buzzer module is used for emitting sound prompt.

[0015] Further, the line patrol instrument line patrol emission and alignment module emits signals for line patrol and receives signals for alignment;

[0016] The line patrol instrument battery voltage conversion module is used for providing stable power supply;

[0017] The line patrol instrument line pressure inspection module is used for detecting whether the line is well crimped;

[0018] The line patrol instrument LED display module is used for displaying the line patrol, alignment and line pressure state through the LED indicator;

[0019] The line patrol instrument illuminating lamp driving module is used for controlling the illuminating lamp to be bright or dark.

[0020] Further, the multimeter measurement circuit module adopts an SD7835A chip.

[0021] Further, the line patrol instrument line patrol emission and alignment module adopts a PFS123-H20 chip and a CD4017 chip.

[0022] Further, the line patrol instrument line pressure inspection module adopts a CD4051B chip and a 74LVC1G14DBVR chip.

[0023] Further, the multimeter circuit is independently powered;

[0024] The line patrol instrument circuit is independently powered.

[0025] Further, the multimeter circuit and the line patrol instrument circuit are independently designed on the circuit boards.

[0026] The utility model discloses the beneficial effects of:

[0027] The utility model provides a multimeter line patrol appearance circuit, including multimeter circuit and line patrol appearance circuit, multimeter circuit and line patrol appearance circuit gather in one same physical measuring device, although multimeter circuit and line patrol appearance circuit gather on same physical hardware, but two circuit completely independent, adopt independent power and independent power switch, satisfy the requirement of user with one physical device has two test functions, convenient to carry. BRIEF DESCRIPTION OF DRAWINGS

[0028] In the drawings:

[0029] Figure 1 The utility model provides a multimeter line patrol appearance's system structure schematic diagram for the embodiment of the utility model;

[0030] Figure 2 The utility model provides a multimeter measuring circuit module circuit diagram for the embodiment of the utility model;

[0031] Figure 3 The utility model provides a multimeter battery voltage conversion module circuit diagram for the embodiment of the utility model

[0032] Figure 4 The utility model provides a multimeter input interface module circuit diagram for the embodiment of the utility model;

[0033] Figure 5 The utility model provides a multimeter LCD display drive module circuit diagram for the embodiment of the utility model;

[0034] Figure 6 The utility model provides a multimeter backlight drive module circuit diagram for the embodiment of the utility model;

[0035] Figure 7 The utility model provides a multimeter buzzer module circuit diagram for the embodiment of the utility model;

[0036] Figure 8 The utility model provides a line patrol appearance line patrol transmission and opposite line module circuit diagram for the embodiment of the utility model;

[0037] Figure 9 The utility model provides a line patrol appearance battery voltage conversion module circuit diagram for the embodiment of the utility model;

[0038] Figure 10 The utility model provides a line patrol appearance pressure line inspection module circuit diagram for the embodiment of the utility model;

[0039] Figure 11 The utility model provides a line patrol appearance LED display module circuit diagram for the embodiment of the utility model;

[0040] Figure 12The utility model provides a line patrol appearance lighting lamp drive module circuit diagram provided for the embodiment of the utility model. DETAILED DESCRIPTION

[0041] To make the purpose, technical scheme and advantage of the embodiment of the application more clear, the technical scheme in the embodiment of the application will be clearly and completely described below in combination with the drawings in the embodiment of the application. Obviously, the described embodiment is a part of the embodiment of the application, not all the embodiment of the application. The components of the embodiment of the application described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] As Figure 1 The utility model provides a line patrol appearance lighting lamp drive module circuit diagram provided for the embodiment of the utility model. The utility model discloses a line patrol appearance circuit of multimeter, including multimeter circuit and line patrol appearance circuit, multimeter circuit and line patrol appearance circuit gather in one same physical measuring device, this physical measuring device preferably is a plastic shell, and the plastic shell includes two partial areas, is used to install multimeter circuit and line patrol appearance circuit respectively, both adopt independent power supply, and adopt independent circuit board design respectively to realize electrical physical isolation. This design not only satisfies the demand of user to multifunctional measurement, still avoided the influence of electromagnetic interference to the measurement result, such as, multimeter reading jump or line patrol sensitivity decline etc., meets the requirement of creepage distance and safety regulation, as preferred, two independent circuit boards can adopt PCB and shielded case design, so can ensure that multimeter circuit still can keep ± 0.5% accuracy under 200mV microvoltage range, and line patrol appearance detection depth promotes to 3 meters, and the anti -interference ability is strong. Further, multimeter circuit and line patrol appearance circuit adopt independent power supply and independent power switch, double independent power supply realizes energy isolation, and line patrol appearance circuit high current pulse power supply and multimeter low power consumption demand do not influence each other, be favorable to the promotion of the endurance of whole measuring device, can also avoid the system instability caused by voltage fluctuation.

[0043] As Figure 1 The utility model discloses a line patrol appearance circuit of multimeter, including multimeter circuit and line patrol appearance circuit, multimeter circuit and line patrol appearance circuit gather in one same physical measuring device, this physical measuring device preferably is a plastic shell, and the plastic shell includes two partial areas, is used to install multimeter circuit and line patrol appearance circuit respectively, both adopt independent power supply, and adopt independent circuit board design respectively to realize electrical physical isolation. This design not only satisfies the demand of user to multifunctional measurement, still avoided the influence of electromagnetic interference to the measurement result, such as, multimeter reading jump or line patrol sensitivity decline etc., meets the requirement of creepage distance and safety regulation, as preferred, two independent circuit boards can adopt PCB and shielded case design, so can ensure that multimeter circuit still can keep ± 0.5% accuracy under 200mV microvoltage range, and line patrol appearance detection depth promotes to 3 meters, and the anti -interference ability is strong.

[0044] As Figure 1 The utility model discloses a line patrol appearance circuit of multimeter, including multimeter circuit and line patrol appearance circuit, multimeter circuit and line patrol appearance circuit gather in one same physical measuring device, this physical measuring device preferably is a plastic shell, and the plastic shell includes two partial areas, is used to install multimeter circuit and line patrol appearance circuit respectively, both adopt independent power supply, and adopt independent circuit board design respectively to realize electrical physical isolation. This design not only satisfies the demand of user to multifunctional measurement, still avoided the influence of electromagnetic interference to the measurement result, such as, multimeter reading jump or line patrol sensitivity decline etc., meets the requirement of creepage distance and safety regulation, as preferred, two independent circuit boards can adopt PCB and shielded case design, so can ensure that multimeter circuit still can keep ± 0.5% accuracy under 200mV microvoltage range, and line patrol appearance detection depth promotes to 3 meters, and the anti -interference ability is strong.

[0045] As Figure 2 As Figure 2The utility meter measurement circuit module circuit diagram is used for measuring the parameters of voltage, current and resistance, and the module adopts an SD7835A chip to measure voltage, current and resistance and the like. Through the design of the measurement circuit, the measurement requirements of different ranges can be realized, such as the voltage measurement range from 400.0 mV to 600 V, the current measurement range from 40.00 mA to 11.00 A, and the resistance measurement range from 400.0 Ω to 40.00 MΩ.

[0046] As shown in Figure 3 , Figure 3 The utility meter battery voltage conversion module circuit diagram is used for providing a stable power supply, and through a voltage conversion chip, the battery voltage is converted into a stable voltage required by the circuit to ensure the normal work of the measurement circuit.

[0047] As shown in Figure 4 , Figure 4 The utility meter input interface module circuit diagram is used for connecting the measurement probe and receiving the input signal, and through the design of the input interface circuit, the reception and processing of different measurement signals can be realized.

[0048] As shown in Figure 5 , Figure 5 The utility meter LCD display driving module circuit diagram is used for driving the LCD screen to display the measurement result, and the module adopts an LCD driving chip to drive the LCD screen to display the measurement result. Through the design of the LCD display driving circuit, the clear display of the measurement result can be realized, and the user can read conveniently.

[0049] As shown in Figure 6 , Figure 6 The utility meter backlight driving module circuit diagram is used for controlling the backlight of the LCD screen, and the module is responsible for controlling the backlight of the LCD screen. Through the design of the backlight driving circuit, the brightness of the backlight can be automatically adjusted according to the intensity of the ambient light, and the readability of the screen is improved.

[0050] As shown in Figure 7 , Figure 7 The utility meter buzzer module circuit diagram is used for emitting sound prompts, and the module is responsible for emitting sound prompts. During the measurement process, when the measurement result meets a specific condition, the buzzer emits a sound prompt, such as the on-off test or the diode test.

[0051] The embodiment of the utility model discloses a user selects the measuring function through the key in the multimeter measuring circuit module, and the measuring circuit receives the input signal, and after amplification, filtering and other processing, the result is transmitted to the LCD display drive module. The LCD screen displays the measurement result, the backlight drive module adjusts the backlight brightness according to the ambient light, and the buzzer module emits sound prompt under certain conditions.

[0052] As Figure 8 Indicated, Figure 8 It is the circuit diagram of the line patrol instrument line patrol transmission and line alignment module, and the line patrol instrument line patrol transmission and line alignment module transmission signal is used for line patrol, and the receiving signal is used for line alignment, the module adopts PFS123-H20 chip and CD4017 chip, is responsible for transmission signal and is used for line patrol, and receiving signal is used for line alignment. Through the design of signal generator and receiver, the accurate detection and positioning of the line can be realized.

[0053] As Figure 9 Indicated, Figure 9 It is the circuit diagram of the line patrol instrument battery voltage conversion module, and the line patrol instrument battery voltage conversion module is used for being responsible for providing stable power supply, through voltage conversion chip, battery voltage is converted into the stable voltage required by circuit, ensures the normal work of line patrol instrument circuit.

[0054] As Figure 10 Indicated, Figure 10 It is the circuit diagram of the line patrol instrument line pressure inspection module, and the line patrol instrument line pressure inspection module is used for being responsible for detecting whether the line is well crimped, the module adopts CD4051B chip and 74LVC1G14DBVR chip, is responsible for detecting whether the line is well crimped. Through the design of line pressure inspection circuit, the reliability of line connection can be ensured, and the measurement error caused by poor line contact can be avoided.

[0055] As Figure 11 Indicated, Figure 11 It is the circuit diagram of the line patrol instrument LED display module, and the line patrol instrument LED display module is used for being responsible for displaying the line patrol, line alignment and line pressure state through LED indicator, the module all displays the line patrol, line alignment and line pressure state through LED indicator. When the line connection is good, the LED indicator will light up, otherwise it will be extinguished, which is convenient for user to intuitively understand the line patrol state.

[0056] As Figure 12 Indicated, Figure 12 It is the circuit diagram of the line patrol instrument lighting lamp drive module, and the line patrol instrument lighting lamp drive module is used for being responsible for the light of lighting lamp. In the environment of insufficient light, the lighting lamp can provide auxiliary lighting, which is convenient for user to operate the line patrol.

[0057] In the embodiment, the user starts the line inspection function by pressing the key, the signal generator transmits signals of a specific frequency, the signals are transmitted to the cable through the RJ45 interface, and the receiving end detects the signal strength.The line inspection module detects the line connection state, the line inspection instrument LED display module displays the line inspection result according to the signal strength and the line state, and the light driving module provides auxiliary lighting when the light is insufficient.

[0058] In the embodiment of the utility model, the multimeter circuit drives the liquid crystal display screen to display the measurement result through the multimeter LCD display driving module, the line inspection instrument LED display module drives the indicator light to indicate the measurement result, both of which can support double-function synchronous monitoring, such as observing the line on-off state and voltage value during line inspection, which can reduce the mode switching frequency and also reduce the misoperation rate.Further, the multimeter LCD display driving module and the line inspection instrument LED display module are separately driven, avoiding the accelerated aging of the liquid crystal molecular structure caused by the high-frequency PWM dimming (typical frequency 2kHz) of the backlight module in the traditional design, and prolonging the screen life to more than 8000 hours.

[0059] In the embodiment of the utility model, when a single function module fails, that is, one function in the multimeter circuit or the line inspection instrument circuit fails, it will not affect the use of the other function.During maintenance, targeted maintenance and replacement can be performed to reduce maintenance costs.

[0060] The utility model provides a kind of multimeter line inspection instrument circuit, including multimeter circuit and line inspection instrument circuit, the multimeter circuit and the line inspection instrument circuit are collected in one same physical measurement device, although multimeter circuit and line inspection instrument circuit are collected on same physical hardware, but two circuits are completely independent, using independent power supply and independent power switch, meet the requirement that user uses one physical device to have two test functions, it is convenient to carry.Meanwhile, the power supply and power switch of multimeter circuit and line inspection instrument circuit are independent, completely avoid the measurement error caused by electromagnetic interference, meet the requirement of creepage distance and safety regulations.Further, both use independent power supply design, do not use unified power supply design, in addition to possibly causing electric shock, when line inspection instrument needs to be closed and multimeter function needs to be opened, unified power supply will cause 15 seconds to 20 seconds function switching delay, and independent power supply design, independent circuit module can make switching delay control within 0.3 seconds.Further, if unified single power supply is used, there is the risk of power supply coupling system, line inspection instrument transmitting end transient current (typical value 2A) can cause power voltage sudden drop, and cause multimeter function reset.And independent power supply design, multimeter power ripple is controlled within 10mVpp, meet IEC61000-4 standard.

[0061] The above-described embodiments are merely preferred embodiments of the present application, which are described in more detail and specifically, but should not be understood as limiting the scope of the present application. It should be noted that, for those skilled in the art, several modifications, improvements and substitutions can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A multimeter line tracer circuit, comprising: The utility meter circuit and the line inspection circuit are integrated in one physical measuring device; The utility meter circuit includes a utility meter measuring circuit module, a utility meter battery voltage conversion module, a utility meter input interface module, a utility meter LCD display driving module, a utility meter backlight driving module and a utility meter buzzer module, and the utility meter circuit is turned on by an independent power switch; The line inspection circuit includes a line inspection line transmission and alignment module, a line inspection battery voltage conversion module, a line inspection line pressure inspection module, a line inspection LED display module and a line inspection illuminating lamp driving module, and the line inspection circuit is turned on by an independent power switch.

2. The utility meter line inspection circuit according to claim 1, wherein: The utility meter measuring circuit module is responsible for measuring voltage, current and resistance parameters; The utility meter battery voltage conversion module is responsible for providing stable power supply; The utility meter input interface module is responsible for connecting the measuring probe and receiving the input signal; The utility meter LCD display driving module is responsible for driving the LCD screen to display the measurement results; The utility meter backlight driving module is responsible for controlling the backlight of the LCD screen; The utility meter buzzer module is responsible for issuing sound prompts.

3. The utility meter line inspection circuit according to claim 1, wherein: The line transmission and alignment module of the line inspection circuit transmits signals for line inspection and receives signals for alignment; The line inspection battery voltage conversion module is responsible for providing stable power supply; The line inspection line pressure inspection module is responsible for detecting whether the line is well crimped; The line inspection LED display module is responsible for displaying the line inspection, alignment and line pressure states through the LED indicator light; The line inspection illuminating lamp driving module is responsible for controlling the on-off of the illuminating lamp.

4. The circuit for a multimeter line tracer according to claim 2, wherein, The utility meter measuring circuit module adopts an SD7835A chip.

5. The circuit for a multimeter line tracer according to claim 3, wherein, The line transmission and alignment module of the line inspection circuit adopts a PFS123-H20 chip and a CD4017 chip.

6. The circuit for a multimeter line tracer according to claim 3, wherein, The line inspection line pressure inspection module adopts a CD4051B chip and a 74LVC1G14DBVR chip.

7. The circuit for a multimeter line tracer according to claim 1, wherein, The utility meter circuit is powered by an independent power supply; The line inspection circuit is powered by an independent power supply.

8. The circuit for a multimeter line tracer according to claim 1, wherein, The utility meter circuit and the line inspection circuit are respectively designed as independent circuit boards.

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