A multi-functional multimeter adapter detection circuit

Abstract

This invention provides a multifunctional multimeter adapter testing circuit. The multifunctional multimeter adapter testing circuit includes a red probe, a three-position switch, a red probe socket, a black probe socket, and a black probe. The first terminal of the three-position switch is connected to the red probe and the red probe socket. The second terminal of the three-position switch is connected to one end of a resistor. The third terminal of the three-position switch is connected to one end of two resistors. The other end of resistor one is connected to one end of a power light bulb. The other end of resistor two is connected to the positive terminal of a red LED. The other end of resistor three is connected to the negative terminal of a green LED. The multifunctional multimeter adapter testing circuit provided by this invention has the advantages of integrating three professional testing modes, reducing equipment switching costs, and significantly expanding the application scenarios of multimeters through its compatibility design.

Description

Technical Field

[0001] This utility model relates to the field of electronic measuring instrument technology, and in particular to a multifunctional multimeter adapter detection circuit. Background Technology

[0002] In existing technologies, circuit repair often faces the following pain points: 1. Traditional multimeters cannot intuitively distinguish between virtual voltage (voltage drop under load) and real voltage. For example, they are insufficient for applications such as judging the power supply line and signal line of sensors, poor line contact, etc., and require the purchase of a high-power test lamp tool. 2. Detection of low-frequency pulse signals (such as fuel injector signals) requires an oscilloscope, which is costly and complex to operate; 3. Switching between multiple tools makes operation cumbersome and prone to errors in line connection.

[0003] Therefore, it is necessary to provide a new multi-functional multimeter adapter detection circuit to solve the above-mentioned technical problems. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a multi-functional multimeter adapter testing circuit that integrates three professional testing modes, reduces equipment switching costs, and greatly expands the application scenarios of multimeters through its compatibility design.

[0005] To solve the above-mentioned technical problems, the multifunctional multimeter adapter detection circuit provided by this utility model includes: a red probe, a three-position switch, a red probe socket, a black probe socket, and a black probe. The first end of the three-position switch is connected to the red probe and the red probe socket. The second end of the three-position switch is connected to one end of resistor one. The third end of the three-position switch is connected to one end of resistor two and one end of resistor three. The other end of resistor one is connected to one end of a power bulb. The other end of resistor two is connected to the positive terminal of a red LED. The other end of resistor three is connected to the negative terminal of a green LED. The other end of the power bulb, the negative terminal of the red LED, and the positive terminal of the green LED are all connected to the black probe socket and the black probe.

[0006] Preferably, it also includes a housing, and the three-position switch, the first resistor, the power bulb, the second resistor, the third resistor, the red LED and the green LED are all installed inside the housing.

[0007] Preferably, the red probe and the black probe are located on the same side of the housing, and the red probe socket and the black probe socket are located on the side of the housing away from the red probe.

[0008] Preferably, the resistor is of model MF72-10D15.

[0009] Preferably, the resistance values ​​of resistor 2 and resistor 3 are both 4.7KΩ.

[0010] Preferably, the red LED and the green LED are model SMD0805 red light and SMD0805 green light, respectively.

[0011] Compared with related technologies, the multifunctional multimeter adapter detection circuit provided by this utility model has the following beneficial effects: This utility model provides a multifunctional multimeter adapter detection circuit, which incorporates a 24V 5W automotive instrument bulb (power bulb) and is protected by a current-limiting resistor circuit. It is used to visually display the actual electrical state of the circuit (the bulb has low brightness or is not lit when there is a false electrical condition, and emits stable light when there is a real electrical condition). Simultaneously, it can be used in conjunction with the multimeter's voltage range to display voltage changes under load and without load, aiding in the analysis of voltage load capacity. A high-sensitivity LED, combined with the current-limiting resistor, is used to visualize the real-time display of low-frequency pulse signal frequency and amplitude changes from 3-28V (e.g., flashing frequency corresponds to signal frequency, brightness corresponds to amplitude). It retains the multimeter's native measurement functions and employs a KCD1 rocker-type three-position switch for mechanical locking of different circuit modules, making it convenient and durable. Attached Figure Description

[0012] Figure 1 Circuit diagram of the multi-functional multimeter adapter detection circuit provided by this utility model; Figure 2 A schematic diagram of the multifunctional multimeter adapter detection circuit provided by this utility model; Figure 3 for Figure 2 The diagram shows the structure viewed from below.

[0013] The following are labeled in the diagram: 1. Red probe, 2. Three-position switch, 3. Red probe socket, 4. Resistor 1, 5. Power bulb, 6. Resistor 2, 7. Resistor 3, 8. Red LED, 9. Green LED, 10. Black probe socket, 11. Black probe, 12. Housing. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0015] Please refer to the following: Figure 1 , Figure 2 and Figure 3 ,in, Figure 1 Circuit diagram of the multi-functional multimeter adapter detection circuit provided by this utility model; Figure 2 A schematic diagram of the multifunctional multimeter adapter detection circuit provided by this utility model; Figure 3 for Figure 2The diagram shows a top-down view of the structure. The multi-function multimeter adapter testing circuit includes: a red probe 1, a three-position switch 2, a red probe socket 3, a black probe socket 10, and a black probe 11. The first end of the three-position switch 2 is connected to the red probe 1 and the red probe socket 3. The second end of the three-position switch 2 is connected to one end of a resistor 4. The third end of the three-position switch 2 is connected to one end of a resistor 6 and one end of a resistor 7. The other end of the resistor 4 is connected to one end of a power bulb 5. The other end of the resistor 6 is connected to the positive terminal of a red LED 8. The other end of the resistor 7 is connected to the negative terminal of a green LED 9. The other end of the power bulb 5, the negative terminal of the red LED 8, and the positive terminal of the green LED 9 are all connected to the black probe socket 10 and the black probe 11.

[0016] The red probe 1 and the black probe 11 are used to connect to a multimeter; It also includes a housing 12, in which the three-position switch 2, resistor one 4, power bulb 5, resistor two 6, resistor three 7, red LED 8 and green LED 9 are all installed.

[0017] The red probe 1 and the black probe 11 are located on the same side of the housing 12, and the red probe socket 3 and the black probe socket 10 are located on the side of the housing 12 away from the red probe 1.

[0018] The resistor 4 is an NTC thermistor (10Ω at 25℃), model number MF72-10D15.

[0019] The resistance values ​​of resistor 6 and resistor 7 are both 4.7KΩ.

[0020] The red LED 8 and the green LED 9 are model SMD0805 red light and SMD0805 green light, respectively.

[0021] The working principle of the multifunctional multimeter adapter detection circuit provided by this utility model is as follows: Power test lamp mode: When the three-position switch 2 is turned on, resistor 4 is connected in series with the power bulb 5 to form a closed circuit. When the input voltage increases, the resistance of resistor 4 decreases to compensate for the increase in current. The voltage load capacity (range 0-28V) can be judged by simultaneously observing the brightness of the power bulb 5 and the voltage display of the multimeter. LED indicator mode: The signal is rectified by the isolation diode and then drives the LED to flash, with the frequency synchronized with the input signal (3-28V).

[0022] Normal mode: Directly connects to the multimeter probe signal, supporting routine measurements.

[0023] Compared with related technologies, the multifunctional multimeter adapter detection circuit provided by this utility model has the following beneficial effects: This utility model provides a multifunctional multimeter adapter detection circuit, which incorporates a 24V 5W automotive instrument bulb (power bulb 5). A current-limiting resistor protection circuit is used to visually display the actual electrical state of the circuit (the bulb has low brightness or is not lit when there is a false electrical condition, and emits stable light when there is a real electrical condition). It can also be used in conjunction with the multimeter's voltage range to display voltage changes under load and without load, helping to analyze voltage load capacity. A high-sensitivity LED, combined with the current-limiting resistor, is used to visualize the real-time display of low-frequency pulse signal frequency and amplitude changes from 3-28V (e.g., flashing frequency corresponds to signal frequency, brightness corresponds to amplitude). The original measurement functions of the multimeter are retained. A KCD1 rocker-type three-position switch 2 is used to mechanically lock different circuit modules, making operation convenient and durable.

[0024] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A multi-function multimeter adaptation detection circuit, characterized by, include: The device consists of a red probe, a three-position switch, a red probe socket, a black probe socket, and a black probe. The first end of the three-position switch is connected to the red probe and the red probe socket. The second end of the three-position switch is connected to one end of resistor one. The third end of the three-position switch is connected to one end of resistor two and one end of resistor three. The other end of resistor one is connected to one end of a power bulb. The other end of resistor two is connected to the positive terminal of a red LED. The other end of resistor three is connected to the negative terminal of a green LED. The other end of the power bulb, the negative terminal of the red LED, and the positive terminal of the green LED are all connected to the black probe socket and the black probe.

2. The multi-function multimeter adaptation detection circuit of claim 1, wherein, It also includes a housing, and the three-position switch, resistor one, power bulb, resistor two, resistor three, red LED and green LED are all installed inside the housing.

3. The multi-function multimeter adaptation detection circuit of claim 2, wherein, The red probe and the black probe are located on the same side of the housing, and the red probe socket and the black probe socket are located on the side of the housing away from the red probe.

4. The multi-meter adaptation detection circuit of claim 1, wherein, The resistor is model MF72-10D15.

5. The multi-function multimeter adaptation detection circuit of claim 1, wherein, The resistance values ​​of resistor two and resistor three are both 4.7KΩ.

6. The multi-function multimeter adaptation detection circuit of claim 1, wherein, The red LED and the green LED are model SMD0805 red and SMD0805 green, respectively.

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