CN219369858U - Universal meter - Google Patents

Abstract

The embodiment of the application provides a universal meter, it includes: the first detection end and the second detection end; the load circuit and the switch are connected in series, and the load circuit and the switch are connected between the first detection end and the second detection end in series; the voltage testing circuit is connected between the first detection end and the second detection end; the voltage testing circuit can test a first voltage of the first detection end when the switch is in an off state and a second voltage of the first detection end when the switch is in an on state. The virtual connection condition can be tested, and for an automobile circuit with the virtual connection condition, the universal meter of the embodiment is more practical, and whether the virtual connection phenomenon exists in the circuit to be detected can be judged through voltage drop of voltage tested twice.

Description

Universal meter

Technical Field

The application relates to the technical field of electronics, in particular to a universal meter.

Background

The universal meter is a necessary tool for general electronic electrician lovers and maintenance staff, the conventional universal meter is generally in a structure form of a meter body and double meter pens, when the universal meter with double meter pens is used, a place is generally found firstly, the machine body is placed or hung, and then two hands respectively hold one meter pen for testing, and the universal meter is mainly used for measuring voltage, current, resistance and the like. The multimeter in the related art has fewer functions and cannot meet the requirements of users.

Disclosure of Invention

The embodiment of the application provides a universal meter which can detect whether a circuit to be detected has virtual connection.

In a first aspect, embodiments of the present application provide a multimeter comprising:

the first detection end and the second detection end;

the load circuit and the switch are connected in series, and the load circuit and the switch are connected between the first detection end and the second detection end in series;

the voltage testing circuit is connected between the first detection end and the second detection end;

the voltage testing circuit can test a first voltage of the first detection end when the switch is in an off state and a second voltage of the first detection end when the switch is in an on state.

In some alternative embodiments, the multimeter further comprises:

and the key is connected with the switch and can control the switch to be switched from one of an off state and an on state to the other after being triggered.

In a second aspect, embodiments of the present application further provide a multimeter comprising:

the first detection end and the second detection end;

the pulse test circuit is connected between the first detection end and the second detection end, the pulse test circuit comprises a first light emitter and a second light emitter, the positive electrode of the first light emitter is connected with the first detection end, the negative electrode of the first light emitter is connected with the second detection end, the positive electrode of the second light emitter is connected with the second detection end, and the negative electrode of the first light emitter is connected with the first detection end.

In some alternative embodiments, the multimeter further comprises:

the main body part comprises a main shell, a main board and a metal nib, wherein the main board is arranged in the main shell, the metal nib is arranged at the end part of the main shell, the metal nib is connected with the main board, and the metal nib is used as the first detection end;

and the test pen is connected with the main body part, and one end, away from the main body part, of the test pen is used as a second detection end.

In some optional embodiments, the main body portion further includes a nib cover and a pen-tip metal holder, the pen-tip metal holder is mounted on the main board, the metal nib is connected with the pen-tip metal holder and penetrates through the pen-tip metal holder, the nib cover covers the pen-tip metal holder, and the metal nib penetrates through the nib cover.

In some alternative embodiments, the pen tip cap has a light-transmitting portion, and the main body further includes a light-emitting lamp mounted to the main board, the light-emitting lamp facing the light-transmitting portion, so that light emitted from the light-emitting lamp is transmitted through the light-transmitting portion.

In some alternative embodiments, the light transmissive portion is disposed adjacent the metallic nib.

In some alternative embodiments, the multimeter further comprises:

the flexible connecting wire, flexible connecting wire one end is connected the mainboard, the flexible connecting wire other end is connected the test pen.

In some alternative embodiments, a connection interface is arranged at one end of the main body part far away from the metal pen point, the connection interface is connected with the main board, and the flexible connecting wire is detachably connected with the connection interface.

In some alternative embodiments, the body portion further comprises:

the battery is arranged in the main shell and is connected with the main board;

the display screen is arranged on the main shell, at least part of the display screen is exposed out of the main shell, and the display screen is connected with the main board and the battery.

In this embodiment of the present application, the multimeter tests the first voltage of the circuit to be detected first, then turns on the switch connected in series with the load circuit in the multimeter, that is, connects the load circuit and the circuit to be detected in parallel, then tests the second voltage of the circuit to be detected, if the second voltage is not different from the first voltage, it indicates that the portion of the circuit to be detected has no virtual connection, and if the second voltage is significantly smaller than the first voltage, it indicates that the portion of the circuit to be detected has virtual connection. Specifically, if the part of the circuit to be detected has virtual connection, the resistance of the virtual connection part is very large, and the corresponding voltage of the virtual connection part is also very large. If the part of the circuit to be detected is not in virtual connection, the resistance of the virtual connection part is smaller, and when the load circuit is connected in parallel with the circuit to be detected, the load circuit and the smaller resistance of the part are also connected in parallel, so that the equivalent resistance of the load circuit and the corresponding resistance of the part are almost even larger, and the voltage corresponding to the equivalent resistance of the load circuit and the load circuit is almost or larger than the voltage corresponding to the equivalent resistance of the load circuit and the load circuit. Compared with the situation that the conventional universal meter cannot test virtual connection, the scheme of the embodiment can test the virtual connection, is more practical for an automobile circuit with the virtual connection easily, and can judge whether the virtual connection phenomenon exists in the circuit to be detected through voltage drop of voltage of two tests.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person skilled in the art.

For a more complete understanding of the present application and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts throughout the following description.

FIG. 1 is a schematic diagram of a multimeter according to an embodiment of the present application.

FIG. 2 is a schematic diagram of a load test circuit in the multimeter of FIG. 1.

FIG. 3 is a schematic view of the structure of the multimeter shown in FIG. 1.

FIG. 4 is a schematic diagram of a pulse testing circuit in the multimeter of FIG. 3.

FIG. 5 is a schematic view of the structure of a portion of the main body portion of the multimeter of FIG. 1 or FIG. 3.

FIG. 6 is an exploded view of a portion of the structure of the multimeter of FIG. 5.

FIG. 7 is a schematic view of another portion of the main body portion of the multimeter of FIG. 1.

FIG. 8 is a schematic view of the structure of a main housing of the multimeter of FIG. 1.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present application based on the embodiments herein.

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a multimeter according to an embodiment of the present application, and fig. 2 is a schematic diagram of a load test circuit in the multimeter shown in fig. 1. Multimeter 10 includes a first sensing terminal 152, a second sensing terminal 154, a load circuit 122, a switch 124, and a voltage testing circuit 126. The first detecting terminal 152 and the second detecting terminal 154 may be used as two detecting terminals of the multimeter 10, and may also be understood as being used for respectively connecting the positive electrode and the negative electrode of the circuit 20 to be detected.

The load circuit 122, the switch 124, and the voltage test circuit 126 form the load test circuit 120. The load circuit 122 and the switch 124 are connected in series, and the load circuit 122 and the switch 124 are connected in series between the first detection terminal 152 and the second detection terminal 154. Illustratively, one end of the load circuit 122 is connected to the first detecting terminal 152, the other end of the load circuit 122 is connected to one end of the switch 124, and the other end of the switch 124 is connected to the second detecting terminal 154. In another example, the positions of the load circuit 122 and the switch 124 may be reversed, that is, one end of the switch 124 is connected to the first detection terminal 152, the other end of the switch 124 is connected to one end of the load circuit 122, and the other end of the load circuit 122 is connected to the second detection terminal 154.

The voltage testing circuit 126 is connected between the first detecting terminal 152 and the second detecting terminal 154, and the voltage testing circuit 126 can be used for detecting voltage.

The voltage testing circuit 126 is capable of testing a first voltage of the first detecting terminal 152 when the switch 124 is in an off state, and testing a second voltage of the first detecting terminal 152 when the switch 124 is in an on state. It may also be understood that, when the switch 124 in the multimeter 10 is turned off, that is, the load circuit 122 is not connected between the first detecting end 152 and the second detecting end 154, and the first voltage of the circuit 20 to be detected is obtained by testing, then the switch 124 in the multimeter 10 connected in series with the load circuit 122 is turned on, that is, the load circuit 122 is connected in parallel with the circuit 20 to be detected, and then the second voltage of the circuit 20 to be detected is tested, if the second voltage is not different from the first voltage, it indicates that the portion of the circuit 20 to be detected is not in a virtual connection, and if the second voltage is significantly smaller than the first voltage, it indicates that the portion of the circuit 20 to be detected is in a virtual connection. Specifically, if the portion of the circuit 20 to be detected has a virtual connection, the resistance of the virtual connection portion is very large, and correspondingly, the voltage corresponding to the virtual connection portion is also very large, and when the load circuit 122 is connected in parallel with the circuit 20 to be detected, the very large resistances of the load circuit 122 and the virtual connection portion are also connected in parallel, so that the equivalent resistance of the load circuit 122 and the virtual connection portion is obviously smaller than the resistance corresponding to the virtual connection portion, and correspondingly, the voltage corresponding to the equivalent resistance of the load circuit 122 and the virtual connection portion is obviously smaller than the voltage corresponding to the equivalent resistance of the load circuit and the virtual connection portion. If the portion of the circuit 20 to be detected has no virtual connection, the resistance of the virtual connection portion is smaller, and when the load circuit 122 is connected in parallel with the circuit 20 to be detected, the load circuit 122 and the portion with smaller resistance are also connected in parallel, so that the equivalent resistance of the load circuit 122 and the portion with corresponding resistance are almost even larger, and correspondingly, the voltage corresponding to the equivalent resistance of the load circuit 122 and the portion with corresponding resistance is almost or larger than before. Compared with the situation that the conventional multimeter cannot test the virtual connection, the multimeter of the embodiment can test the virtual connection, and for the automobile circuit easy to have the virtual connection, the multimeter 10 of the embodiment is more practical, and can judge whether the virtual connection phenomenon exists in the circuit 20 to be detected through the voltage drop of the voltage tested twice.

It is understood that the circuit to be detected 20 may be equivalently a signal source, an equivalent resistor R1, an equivalent resistor R2, and an imaginary connection point between the equivalent resistor R1 and the equivalent resistor R2.

Multimeter 10 can further include a key 161, wherein key 161 is coupled to switch 124, and wherein upon actuation of key 161 can control switching of switch 124 from one of an off state and an on state to the other. For example, when switch 124 in current multimeter 10 is in an off state, if key 161 is actuated, such as by a user pressing, switch 124 switches from the off state to the on state, and at this time key 161 is again actuated, switch 124 switches from the on state to the off state. Of course, in some embodiments, the key 161 is activated to control only the switch 124 to switch from the off state to the on state, or to control only the switch 124 to switch from the on state to the off state.

Referring to fig. 3 and 4, fig. 3 is a schematic structural diagram of the multimeter shown in fig. 1, and fig. 4 is a schematic diagram of a pulse test circuit in the multimeter shown in fig. 3. Multimeter 10 can further include a pulse test circuit 140, where pulse test circuit 140 is connected between first detection end 152 and second detection end 154, pulse test circuit 140 includes a first light emitter LED1 and a second light emitter LED2, a positive electrode of first light emitter LED1 is connected to first detection end 152, a negative electrode of first light emitter LED1 is connected to second detection end 154, a positive electrode of second light emitter LED2 is connected to second detection end 154, and a negative electrode of first light emitter LED1 is connected to first detection end 152.

When the circuit 20 to be detected outputs a positive pulse, i.e. the first detecting end 152 is connected to the positive electrode of the circuit 20 to be detected, the second detecting end 154 is connected to the negative electrode of the testing circuit, and the first light emitter LED1 of the pulse testing circuit 140 can be turned on and emit light. When the circuit 20 to be detected outputs a negative pulse, i.e. the first detection end 152 is connected to the negative electrode of the circuit 20 to be detected, the second detection end 154 is connected to the positive electrode of the test circuit, and the second light emitter LED2 of the pulse test circuit 140 can be turned on and emit light. It is possible to quickly detect whether the circuit 20 to be detected outputs a positive pulse signal or a negative pulse signal. The colors of the first light emitter LED1 and the second light emitter LED2 can be different, so that the user can conveniently check. The colors of the first and second light emitters LED1 and LED2 may be 2 of red, blue, green, white, violet, orange. The colors of the first and second light emitters LED1 and LED2 may be the same, but the brightness value of the emitted light is different or the frequency of the emitted light is different, thereby facilitating the user's distinction.

It should be noted that, bus signals of the automobile are basically in the form of a CAN bus of pulse signals, and a conventional multimeter cannot detect the CAN signals. In the testing process, the car maintainer often needs to find out which wire is signaled in a pile of car lines, and make some maintenance judgment through the signals. The multimeter 10 of the present embodiment has a light emitter, such as a light emitting diode, connected in series therein, so that the light emitter will flash whenever there is a signal change on the first sensing end 152 or the second sensing end 154. Moreover, the reflection is free from any delay, so that the detection can be very fast, and the judgment accuracy is improved.

It can be appreciated that, because the driving requirement of the light emitting diode is low, the voltage difference between the two ends of the light emitting diode can drive the light emitting diode to light as long as the driving voltage of the light emitting diode is satisfied, if the first detecting end 152 and the second detecting end 154 of the multimeter 10 can be connected with appropriate pulse signals, the pulse signals can drive the light emitting diode to light even if the multimeter 10 is not started, so that the user can use and detect the pulse signals quickly. Pulse test circuit 140 is simple in circuit and does not require additional power, and can detect even when multimeter 10 is not powered on.

Optionally, the pulse test circuit 140 may further include a resistor R4 and a resistor R5, where the resistor R4 is connected in series with the first light emitter LED1, and the resistor R5 is connected in series with the second light emitter LED2 to protect the first light emitter LED1 and the second light emitter LED2.

The first light emitter LED1 and the second light emitter LED2 may be LED lamps separately provided, or may be backlight lamps of a display screen.

It will be appreciated that load test circuit 120 and pulse test circuit 140 may be included within multimeter 10. In other embodiments, only load test circuit 120 or pulse test circuit 140 may be included within multimeter 10.

Referring to fig. 5 and 6, fig. 5 is a schematic view of a portion of a main body of the multimeter shown in fig. 1, and fig. 6 is an exploded view of a portion of the multimeter shown in fig. 5. Wherein, multimeter 10 can further include a main body portion 16 and a test pen 18, main body portion 16 is a main portion of multimeter 10, main body portion 16 can include a main housing 162, a main board 163 and a metal nib 164, main board 163 is disposed in main housing 162, metal nib 164 is disposed at an end portion of main housing 162, metal nib 164 is connected with main board 163, and metal nib 164 is used as first detecting end 152. The test pen 18 is connected to the main body portion 16, and an end of the test pen 18 remote from the main body portion 16 serves as a second detection end 154. The metallic nib 164 of the main body 16 serves as the first detecting end 152, and the test pen 18 serves as the second detecting end 154, so that the use is convenient only by holding the main body 16 and the test pen 18.

The main body 16 may be cylindrical or pen-shaped, and a user may conveniently hold the main body 16 with one hand. The outer periphery of the main housing 162 may also be provided with a plurality of anti-slip beads, which may not only be anti-slip but also strengthen the main housing 162.

Optionally, the main body 16 further includes a nib cover 166 and a pen metal stand 165, the pen metal stand 165 is mounted on the main board 163, the metal nib 164 is connected to the pen metal stand 165 and penetrates through the pen metal stand 165, the pen metal stand 165 is covered by the nib cover 166, and the metal nib 164 penetrates through the nib cover 166. The metallic nib 164 may be mounted to the stylus metallic frame 165 to improve the firmness of the metallic nib 164.

The stylus metal frame 165 may be a bent metal plate, and the metal plate includes a middle plate substantially perpendicular to the main plate 163, and side plates connected to two sides of the middle plate, and two side plates are also substantially perpendicular to the main plate 163, and the middle plate and the two side plates are in a U shape. The metallic nib 164 is inserted through the intermediate plate.

The stylus holder 165 may also include a connecting plate that is also generally perpendicular to the main plate 163, the connecting plate being connected to one end of the metallic nib 164, the connecting plate and the metal plate cooperating to secure the metallic nib 164 to the main plate 163.

Optionally, the nib housing 166 has a light-transmitting portion, and the main body 16 further includes a light-emitting lamp 167, where the light-emitting lamp 167 is mounted on the main board 163, and the light-emitting lamp 167 faces the light-transmitting portion, so that light emitted by the light-emitting lamp 167 is transmitted through the light-transmitting portion. The light emitted by the light-emitting lamp 167 can illuminate the place to be tested, so that a user can see the circuit 20 to be tested clearly in a dark place without using an additional flashlight, the light-transmitting part can be a through hole or a light-transmitting lens, the material of the light-transmitting lens can be set according to the requirement, and the material of the light-transmitting lens can be glass, plastic or resin.

Optionally, the main body portion may further include a lamp cover 168, where the lamp cover 168 covers the light emitting lamp 167, and the lamp cover may protect the light emitting lamp 167, and may also collect light emitted by the light emitting lamp 167, and transmit the collected light out of the light transmitting portion.

The light transmitting portion is disposed adjacent to the metal nib 164, and light emitted from the light emitting lamp 167 can illuminate an environment where the metal nib 164 is located, so that a user can conveniently contact the metal nib 164 with a point to be tested in a relatively dark place.

Wherein, multimeter 10 can further comprise flexible connection wire 19, flexible connection wire 19 connects motherboard 163 at one end, and test pencil 18 at the other end of flexible connection wire 19. The test pen 18 is connected to the main board 163 through the flexible connection line 19, and when the metal nib 164 of the main body portion 16 contacts the first point of the circuit 20 to be tested, the test pen 18 can flexibly move through the flexible connection line 19, thereby conveniently contacting other points of the circuit 20 to be tested.

Referring to fig. 7, fig. 7 is a schematic view of another portion of the main body of the multimeter shown in fig. 1. The end of the main body 16 away from the metal nib 164 is provided with a connection interface 169, the connection interface 169 is connected with the main board 163, and the flexible connecting wire 19 is detachably connected with the connection interface 169. The flexible connection wire 19 and the connection interface 169 of the main body portion 16 can be conveniently connected and detached, so that a user can conveniently carry the multimeter 10. Meanwhile, when the flexible connecting wire 19 or the test pen 18 is damaged, only the flexible connecting wire 19 or the test pen 18 needs to be replaced, so that the maintenance is convenient. The flexible connection wire 19 and the connection interface 169 of the main body 16 may be connected in a plugging manner, and electrically connected through corresponding pins. The flexible connection wire 19 and the connection interface 169 of the main body portion 16 may also be magnetically connected, and the electrical connection is achieved through corresponding metal abutment (such as pogo pin).

Multimeter 10 of the present embodiment is further described below for a better understanding of multimeter 10. The body portion 16 may also include a battery 172 and a display 174, among other things. The battery 172 is disposed in the main housing 162, and the battery 172 is connected to the main board 163. The display screen 174 is mounted to the main housing 162, the display screen 174 is at least partially exposed to the main housing 162, and the display screen 174 is connected to the main board 163 and the battery 172. Battery 172 can provide power to motherboard 163 and display 174, and display 174 can display signals of the first voltage, the second voltage, etc., measured by multimeter 10.

The display screen 174 is mounted to the main housing 162 and at least partially exposes the main housing 162, and the display screen 174 may also be used to display information such as resistance values, current values, and the like. Display 174 may be used for display only, or for display and control, i.e., display 174 may be a touch-sensitive display that may be used not only to display information, but also to operate multimeter 10. In embodiments where display 174 is a touch-sensitive display 174, multimeter 10 can also include fewer keys, although the number of keys can be fewer, such as only a power key, or only 2 or 3 keys. In embodiments where display 174 is for display only, multimeter 10 can further comprise a plurality of keys by which multimeter 10 can operate multimeter 10. The number of the plurality of keys may be set as desired, such as 3, 4 or more. The plurality of keys may be provided as desired, such as one or more function keys for switching functions of multimeter 10, a power key for controlling power on and off of multimeter 10, and the like.

Referring to FIG. 8, FIG. 8 is a schematic view of the main housing of the multimeter of FIG. 1. Main housing 162 may include a first housing 1622 and a second housing 1624, with first housing 1622 and second housing 1624 together forming a receiving cavity in which battery 172 and motherboard 163, etc. are disposed, and with first housing 1622 and second housing 1624 being removable for servicing and replacement of components within multimeter 10.

The foregoing has outlined the detailed description of the multimeter provided by the examples of the present application, wherein specific examples are employed to illustrate the principles and embodiments of the present application, and the above examples are provided only to assist in understanding the method of the present application and the core ideas thereof;

meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.

Claims (10)

1. A multimeter, comprising:

the first detection end and the second detection end;

the load circuit and the switch are connected in series, and the load circuit and the switch are connected between the first detection end and the second detection end in series;

the voltage testing circuit is connected between the first detection end and the second detection end;

the voltage testing circuit can test a first voltage of the first detection end when the switch is in an off state and a second voltage of the first detection end when the switch is in an on state.

2. The multimeter of claim 1, further comprising:

and the key is connected with the switch and can control the switch to be switched from one of an off state and an on state to the other after being triggered.

3. A multimeter, comprising:

the first detection end and the second detection end;

the pulse test circuit is connected between the first detection end and the second detection end, the pulse test circuit comprises a first light emitter and a second light emitter, the positive electrode of the first light emitter is connected with the first detection end, the negative electrode of the first light emitter is connected with the second detection end, the positive electrode of the second light emitter is connected with the second detection end, and the negative electrode of the first light emitter is connected with the first detection end.

4. The multimeter of any one of claims 1-3, further comprising:

the main body part comprises a main shell, a main board and a metal nib, wherein the main board is arranged in the main shell, the metal nib is arranged at the end part of the main shell, the metal nib is connected with the main board, and the metal nib is used as the first detection end;

and the test pen is connected with the main body part, and one end, away from the main body part, of the test pen is used as a second detection end.

5. The multimeter of claim 4 wherein the body portion further comprises a nib housing and a stylus metal holder, the stylus metal holder mounted on the motherboard, the metallic nib connected to the stylus metal holder and passing through the stylus metal holder, the nib housing the stylus metal holder, the metallic nib passing through the nib housing.

6. The multimeter of claim 5 wherein the nib housing has a light-transmitting portion, the body portion further comprising a light-emitting light mounted to the motherboard, the light-emitting light facing the light-transmitting portion such that light from the light-emitting light is transmitted through the light-transmitting portion.

7. The multimeter of claim 6 wherein the light transmissive portion is disposed adjacent the metallic nib.

8. The multimeter of claim 4 further comprising:

the flexible connecting wire, flexible connecting wire one end is connected the mainboard, the flexible connecting wire other end is connected the test pen.

9. The multimeter of claim 8 wherein an end of the body portion remote from the metallic nib is provided with a connection interface, the connection interface being connected to the motherboard, the flexible connection line being detachably connected to the connection interface.

10. The multimeter of claim 9 wherein the body portion further comprises:

the battery is arranged in the main shell and is connected with the main board;

the display screen is arranged on the main shell, at least part of the display screen is exposed out of the main shell, and the display screen is connected with the main board and the battery.