CN218727565U - Universal meter - Google Patents

Abstract

The embodiment of the application provides a universal meter, it includes: a housing; the main control board is arranged in the shell; and the tachometer is used for measuring the rotating speed and is electrically connected with the main control board, and the tachometer is arranged in the shell. The tachometer of the multimeter can be used for testing the rotating speed, and the multimeter can meet the requirements of users on corresponding conventional measurement (such as voltage measurement, current measurement or resistance measurement) and can also meet the requirements of users on measuring the rotating speed. For example, when the engine speed of an automobile needs to be measured, the measurement of the rotating speed can be completed by using a multimeter without additionally using a special measuring instrument. The cost is saved, the universal meter has more application occasions, and the competitiveness of the product is improved. Simultaneously, main control board and tachometer set up in same casing, need not set up the tachometer in the detection pen outside the casing, also need not set up structures such as connecting wire, and the universal meter overall structure of this embodiment is succinct, compact, conveniently carries.

Description

Universal meter

Technical Field

The application relates to the technical field of electronics, especially, relate to a universal meter.

Background

The universal meter is a necessary tool for vast electronic and electrical enthusiasts and maintenance personnel, is mainly used for measuring functions such as voltage, resistance, current, capacitance, frequency, duty ratio and the like, and can not meet the requirements of users in some scenes. For example, when the engine speed of an automobile needs to be measured, the existing multimeter cannot complete detection, and a special speed measuring instrument is needed, so that a user needs to use at least 2 instruments when detecting the automobile, and the use is inconvenient.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a universal meter, can be used for detecting the rotational speed, satisfies the demand that the user measured the rotational speed.

The embodiment of the application provides a universal meter, it includes:

a housing;

the main control board is arranged in the shell; and

the revolution meter is used for measuring the revolution speed and is electrically connected with the main control board, and the revolution meter is arranged in the shell.

In some alternative embodiments, the housing includes a body portion and an end portion connected to each other, the end portion having a size smaller than the body portion;

the multimeter further comprises a detection sensor for measuring voltage and/or current, the detection sensor is arranged in the shell, and the detection sensor and the tachometer are at least partially arranged on the end portion.

In some optional embodiments, the detection sensor and the tachometer are arranged side by side along a radial direction of the multimeter.

In some optional embodiments, the tachometer is an optoelectronic tachometer, and the end portion includes a light-transmissive portion disposed opposite the tachometer.

In some optional embodiments, the tachometer comprises an infrared transmitter and an infrared receiver;

the infrared emitter and the infrared receiver are sequentially arranged along the axial direction of the multimeter.

In some optional embodiments, the infrared receiver is disposed between the infrared emitter and the light-transmissive portion.

In some optional embodiments, the tachometer further comprises a lens disposed between the infrared receiver and the light-transmissive portion.

In some optional embodiments, the tachometer further comprises a light guide tube disposed between the infrared receiver and the lens.

In some optional embodiments, the tachometer further includes a light guide tube, the infrared receiver and the lens are disposed in the light guide tube, and one end of the light guide tube is disposed opposite to the light transmission portion.

In some optional embodiments, the end portion includes a connection portion and a tip portion, the connection portion has one end connected to the main body portion and the other end connected to the tip portion, the connection portion has a first accommodation space, the tip portion has a second accommodation space, and the second accommodation space is communicated with the first accommodation space;

the detection sensor is a non-contact voltage induction sensor, and includes a detection portion extending from a first accommodation space of the connection portion to a second accommodation space of the tip portion.

In the embodiment of the application, the universal meter comprises a tachometer, the tachometer can be used for testing the rotating speed, and the universal meter can meet the requirement of a user for corresponding conventional measurement (such as voltage measurement, current measurement or resistance measurement) and can also meet the requirement of the user for measuring the rotating speed. For example, when the engine speed of an automobile needs to be measured, the measurement of the rotating speed can be completed by using a multimeter without additionally using a special measuring instrument. The cost is saved, the universal meter has more application occasions, and the competitiveness of the product is improved. Simultaneously, main control board and tachometer set up in same casing, need not set up the tachometer in the detection pen outside the casing, also need not set up structures such as connecting wire, and the universal meter overall structure of this embodiment is succinct, compact, conveniently carries, does not have the connecting wire to tie a knot, twine the scheduling problem.

Drawings

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

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

FIG. 1 is a schematic structural diagram of a multimeter provided by an embodiment of the present application.

FIG. 2 is an exploded view of the tip, tachometer, and detection sensor of the multimeter shown in FIG. 1.

FIG. 3 is a schematic view of another angle configuration of the multimeter shown in 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 is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without inventive step, are within the scope of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a multimeter provided in the embodiment of the present application, and fig. 2 is an exploded view of an end portion, a tachometer, and a detection sensor of the multimeter shown in fig. 1.

Multimeter 10 includes a case 12, a main control panel 14, and a tachometer 16. Case 12 can serve as a frame for multimeter 10, and a main control panel 14 and tachometer 16, among other things, can be disposed within case 12. A tachometer 16 may be used to measure the rotational speed, and the tachometer 16 is electrically connected to the main control board 14 to cooperate to measure the rotational speed and provide the measured rotational speed to the customer.

After multimeter 10 obtains the measured tachometer information via tachometer 16, it can be presented to the user in a variety of ways. Illustratively, the multimeter 10 further includes a display screen 15, the display screen 15 is connected to the main control board 14, and after the main control board 14 obtains the measured rotation speed information through the tachometer 16, the rotation speed information can be displayed through the display screen 15, so that a user can directly read the rotation speed information through the display screen 15. In another example, multimeter 10 further comprises a speaker (not shown), the speaker is connected to the main control board 14, and the main control board 14 can play the rotation speed information through the speaker after obtaining the rotation speed information obtained by measurement through the tachometer 16, so that the user can listen directly. In another example, multimeter 10 further includes a communication circuit (not shown), the communication circuit is connected to the main control board 14, and after the main control board 14 obtains the measured rotation speed information through the tachometer 16, the rotation speed information can be transmitted to other devices (such as a mobile phone, a computer, etc.) through the communication circuit, so that a user can obtain the rotation speed information through the other devices.

It will be appreciated that multimeter 10 can measure a variety of information, for example, multimeter 10 can measure voltage, resistance, current, capacitance, frequency, duty cycle, and the like. Multimeter 10 in this embodiment further includes a tachometer 16, where tachometer 16 can be used to test a rotational speed, and multimeter 10 can not only meet a user's need for conventional measurements (such as voltage measurements, current measurements, or resistance measurements), but also meet a user's need for measuring a rotational speed. For example, when an engine speed measurement of an automobile is required, the speed measurement can be accomplished using multimeter 10 without the need for additional specialized instrumentation. Saving cost, allowing multimeter 10 to have more applications, and improving product competitiveness. Simultaneously, main control board 14 and tachometer 16 set up in same casing 12, need not set up tachometer 16 in the detection pen outside casing 12, also need not set up structures such as connecting wire, and the universal meter 10 overall structure of this embodiment is succinct, compact, conveniently carries, does not have the connecting wire and ties, twines the scheduling problem.

Wherein the housing 12 comprises a main body portion 122 and an end portion 124 connected to each other, the size of the end portion 124 is smaller than that of the main body portion 122; multimeter 10 further includes a detection sensor 18 for measuring voltage and/or current, detection sensor 18 being disposed within case 12, detection sensor 18 and tachometer 16 both being disposed at end 124, facilitating arrangement of components within multimeter 10, and facilitating detection of detection sensor 18 and tachometer 16.

Wherein the size of the body portion 122 may be much larger than the size of the end portion 124, the end portion 124 may be the top end or the bottom end of the housing 12.

Detection sensor 18 and tachometer 16 are positioned side-by-side along a radial direction of multimeter 10. It will also be appreciated that when multimeter 10 is in a landscape orientation, the detection sensor 18 and tachometer 16 are positioned up and down in the direction of gravity, such as with detection sensor 18 positioned above tachometer 16, or with detection sensor 18 positioned below tachometer 16, such an arrangement may take full advantage of the space within end 124, properly arranging detection sensor 18 and tachometer 16, and positioning two detection sensors 18 within the limited space of end 124.

This embodiment skillfully mounts the test sensor 18 and tachometer 16 in one end 124, which can be easily integrated with most conventional multimeter 10 cases without compromising performance. The problem of universal meter structure among the correlation technique not compact is solved.

Alternatively, the tachometer 16 may be an electro-optical tachometer, and the end portion 124 includes a light-transmissive portion 1246, the light-transmissive portion 1246 being disposed opposite the tachometer 16. The optical signal corresponding to the photoelectric tachometer can pass through the light-transmitting part 1246, which does not affect the detection speed of the photoelectric tachometer, and can well protect the tachometer 16. The light-transmitting portion 1246 may be formed by a transparent material or a light-transmitting material, for example, a resin, a plastic, a glass, a plastic, or the like, and the light-transmitting portion 1246 has a better light transmittance, for example, the light transmittance of the light-transmitting portion 1246 exceeds 85%, 90%, or 95%.

Illustratively, the tachometer 16 may include an infrared transmitter 162 and an infrared receiver 164; infrared transmitter 162 and infrared receiver 164 are arranged in series along the axis of multimeter 10. Infrared emitter 162 can send infrared signal, and infrared signal gets into universal meter 10 after meeting the barrier reflection outside tachometer 16, and infrared receiver 164 can receive this infrared signal after the external barrier reflection to convert the signal of telecommunication into corresponding, and main control board 14 receives this signal of telecommunication, and calculates according to this signal of telecommunication and obtains corresponding rotational speed information.

For better understanding of the present embodiment, the following description will be given by taking an example in which the external obstacle is a rotating shaft of an automobile engine, the outer periphery of the rotating shaft has a gear structure, the gear structure includes a plurality of teeth arranged at intervals, and a hollow area is provided between two adjacent teeth. When the pivot rotated, gear structure followed the rotation, and infrared emitter 162's infrared signal corresponds this gear structure, and at a certain moment promptly, infrared signal reachd gear structure's tooth, is reflected back multimeter 10 by the tooth, is received and is converted into corresponding signal of telecommunication by infrared receiver 164 in multimeter 10. At another time, the IR signal reaches the hollowed out area between two adjacent teeth and continues to travel, possibly failing to reflect back to multimeter 10 if reflected elsewhere, and IR receiver 164 does not receive the reflected IR signal. The rotation speed of the rotating shaft can be calculated by the frequency of the received infrared signal and the number of teeth of the rotating shaft, and the rotation speed of the tire or the rotation of other objects can also be measured by the tachometer 16. The frequency of the infrared emitter 162 emitting the infrared signal may be much greater than the rotation speed of the teeth, and for example, in the rotation process, each tooth can reflect a plurality of infrared signals emitted by the infrared emitter 162, so that the precision of the rotation speed obtained by the test is high.

Wherein ir receiver 164 may be disposed between ir emitter 162 and light-transmissive portion 1246. The IR receiver 164 is closer to the transparent portion 1246 to facilitate acquisition of the reflected IR signal.

The tachometer 16 further includes a lens 166, the lens 166 being disposed between the infrared receiver 164 and the light-transmissive portion 1246. The lens 166 may focus the infrared signals reflected back through the external obstacles so that the infrared receiver 164 receives more infrared signals. The side of the lens 166 facing the transparent portion 1246 may protrude toward the transparent portion 1246. The side of the lens 166 away from the transparent portion 1246 may be disposed as desired, such as being planar or protruding away from the transparent portion 1246.

In some embodiments, the tachometer 16 further includes a light pipe 168 disposed between the infrared receiver 164 and the lens 166. One end of the light guide cylinder 168 can be adjacent to the lens 166, the other end of the light guide cylinder 168 can be adjacent to the infrared receiver 164, and the light guide cylinder 168 can eliminate infrared signals which are not directly incident through the end part 124 from the outside and are reflected to the infrared receiver 164, namely, eliminate light which cannot be directly incident to the infrared receiver 164, and prevent unwanted light (such as light which is directly incident from the outside but not directly incident, light which is incident from the outside and light which is reflected and the like) from interfering the detection of the infrared receiver 164, so that more accurate rotating speed information can be obtained through the test.

In some embodiments, the tachometer 16 further includes a light guide cylinder 168, the infrared receiver 164 and the lens 166 are disposed within the light guide cylinder 168, and one end of the light guide cylinder 168 is disposed opposite the light-transmissive portion 1246. The light guide tube 168 can eliminate the infrared signal that is not directly incident from the outside through the end 124 and reflected to the infrared receiver 164, i.e., eliminate the light that cannot be directly incident to the infrared receiver 164, and prevent the unwanted light (such as the light that is directly incident from the outside but not directly incident, the light that is incident from the outside and reflected, etc.) from interfering the detection of the infrared receiver 164, so that the rotation speed information can be obtained more accurately in the test.

The detection sensor 18 may be provided as needed. Illustratively, the voltage detection sensor 18 may be a non-contact voltage induction sensor. The voltage detection sensor 18 may sense a voltage or electric field radiation in the nearby space to obtain a corresponding voltage signal. For convenience of understanding, the non-contact sensor may be equivalent to an antenna, which can receive an electric field radiation signal, mainly an electric field radiation signal of an ac voltage, and determine the voltage level, or the distance of the voltage signal, by determining the strength of the electric field radiation signal. In other examples, the voltage detection sensor 18 may be a contact voltage sensing sensor, and the voltage detection sensor 18 forms a new loop with an external circuit so as to detect a voltage signal of the external circuit.

In an embodiment where the voltage detecting sensor 18 can be a non-contact voltage sensing sensor, please refer to fig. 3, fig. 3 is a schematic structural diagram of the terminal, the tachometer and the detecting sensor in the multimeter shown in fig. 1. The end portion 124 includes a connection portion 1242 and a tip portion 1244, one end of the connection portion 1242 is connected to the main body portion 122, the other end of the connection portion 1242 is connected to the tip portion 1244, the connection portion 1242 has a first accommodation space, the tip portion 1244 has a second accommodation space, and the second accommodation space is communicated with the first accommodation space; the voltage detection sensor 18 includes a detection portion 182, and the detection portion 182 extends from a first accommodation space of the connection portion 1242 to a second accommodation space of the tip portion 1244.

For example, the detecting portion 182 may have an elongated spring shape, and the detecting portion 182 may extend from the connecting portion 1242 to the tip portion 1244. The tip portion 1244 may be a protrusion protruding from the connecting portion 1242 away from the main body portion 122, the tip portion 1244 may be a flat bar or a flat shape, and the tip portion 1244 also has a second receiving space therein. It is understood that there are other structures in the connecting portion 1242, which may form a recess structure matching the first receiving space, and the sensing portion 182 may be disposed in the recess structure and extend to the second receiving space of the tip portion 1244. It will also be appreciated that the end 124 has a recess therein which extends from the attachment portion 1242 to the foremost edge of the tip portion 1244, and in which the sensing portion 182 is mounted.

In some alternative examples, the foremost edge of tip portion 1244, distal from web portion 1242, may be an arcuate structure, without sharp corners being apparent, to prevent damage to external circuitry or scratching of a user. In other alternative examples, tip portion 1244 may be shaped like a small pointed tip of a bump.

The detecting part 182 of the non-contact voltage induction sensor is equivalent to a probe, the first end part 124 of the embodiment is provided with a convex tip part 1244, the size of the tip part 1244 is small, the front end of the detecting part 182 is similar to the shape of a pen point, and the tip part 1244 is slightly larger than the front end of the detecting part 182, so that the non-contact voltage induction sensor can be very conveniently and accurately used for measuring an environment to be measured. The problem that in the related art, the position of the shell 12 of the universal meter 10 corresponding to the detection part 182 is not obvious, so that troubles are easily brought to users, and the induction function of the non-contact voltage induction sensor cannot be used correctly is solved.

Wherein, tip 124 and main part 122 can be dismantled and be connected, can be convenient dismantle and install tip 124 and main part 122, make things convenient for the later stage to detect and maintain detection sensor 18 and tachometer 16. For example, if the detection sensor 18 or the tachometer 16 is damaged, the end portion 124 can be easily detached from the main body portion 122, and then the damaged detection sensor 18 or the tachometer 16 can be replaced. The end portion 124 and the body portion 122 may be detachably connected by means of snap-fit or screw-fit, etc.

Of course, in other embodiments, the end portion 124 and the main body portion 122 may also be fixedly connected, such as by gluing or heat melting. In other embodiments, the end portion 124 and the main body portion 122 may be integrally formed. For example, the portion of the body portion 122 connected to the end portion 124 is integrally formed with the end portion 124. For another example, the body portion 122 includes a first portion and a second portion that are detachably connected, the end portion 124 includes a third portion and a fourth portion that are detachably connected, the first portion and the fourth portion are integrally formed, and the second portion and the fourth portion are integrally formed.

The main control panel 14 can be provided with a plurality of detection circuits, the plurality of detection circuits can include a voltage detection circuit for detecting voltage and a tachometer detection circuit for detecting the tachometer 16, and can also include a resistance detection circuit for detecting resistance, a current detection circuit for detecting current, a capacitance detection circuit for detecting capacitance, at least one detection circuit of a frequency detection circuit for detecting frequency and a duty ratio detection circuit for detecting duty ratio, the detection of various signals can be realized by the cooperation of the detection devices corresponding to the plurality of detection circuits, for example, the voltage detection circuit and the non-contact voltage induction sensor are matched to realize the detection of voltage, and the tachometer detection circuit and the photoelectric tachometer are matched to realize the detection of the tachometer 16.

It should be noted that, a main control chip is provided on the main control board 14, and the multiple detection circuits may have independent chips respectively, or may be multiplexed with the main control chip, that is, the voltage detection circuit, the tachometer detection circuit, and the like all include the main control chip.

Optionally, a display screen 15 of multimeter 10 is mounted to case 12 and at least partially exposed from case 12. Display screen 15 can be used to display information such as speed information and voltage values. Display screen 15 may be used for display only, as well as for display and control, i.e., display screen 15 may be a touch display screen 15, and touch display screen 15 may be used not only for displaying information, but also for operating multimeter 10. In the embodiment where the display screen 15 is a touch display screen 15, the multimeter 10 can also include keys, and of course, the number of keys can be relatively small, such as only setting a power key, or only setting 2 or 3 keys. In embodiments where display screen 15 is intended only to display, multimeter 10 can also include a plurality of keys by which multimeter 10 can be operated by multimeter 10. The number of the plurality of keys can be set according to the requirement, such as 3, 4 or more.

Multimeter 10 in the embodiment of the present application can be a pen-type multimeter, a common multimeter or other types of multimeters, and the embodiment does not limit the category of multimeters.

In the embodiment where multimeter 10 is a pen multimeter, the case 12 of the pen multimeter can be cylindrical for easy handling by a user. The periphery of the shell 12 may also be provided with a plurality of anti-slip ribs, which may not only prevent slipping but also enhance the strength of the shell 12. A recess may be provided in one side of the housing 12 and the display 15 and keys may be located in the recess. The tip portion 1244 may be disposed on the same side of the housing 12 as the recess, for ease of handling and use by the user.

The multimeter provided by the embodiment of the application is described in detail above, and the principle and the implementation mode of the application are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation manner and the application scope may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (9)

1. A multimeter, comprising:

a housing including a main body portion and an end portion connected to each other, the end portion having a size smaller than that of the main body portion;

the main control board is arranged in the shell; and

the tachometer is used for measuring the rotating speed and is electrically connected with the main control board, and the tachometer is arranged in the shell;

a detection sensor for measuring voltage and/or current, the detection sensor set up in the casing, detection sensor with the tachometer all sets up at least partially in the tip.

2. The multimeter of claim 1, wherein the detection sensor and the tachometer are positioned side-by-side along a radial direction of the multimeter.

3. The multimeter of claim 1, wherein the tachometer is an optoelectronic tachometer, and the end portion includes a light transmissive portion disposed directly opposite the tachometer.

4. The multimeter of claim 3, wherein the tachometer comprises an infrared transmitter and an infrared receiver;

the infrared transmitter and the infrared receiver are sequentially arranged along the axial direction of the multimeter.

5. The multimeter of claim 4, wherein the infrared receiver is disposed between the infrared emitter and the light-transmissive portion.

6. The multimeter of claim 5, wherein the tachometer further comprises a lens disposed between the infrared receiver and the light transmissive portion.

7. The multimeter of claim 6, wherein the tachometer further comprises a light guide barrel disposed between the infrared receiver and the lens.

8. The multimeter of claim 6, wherein the tachometer further comprises a light guide tube, the infrared receiver and the lens are disposed within the light guide tube, and one end of the light guide tube is disposed opposite the light transmissive portion.

9. The multimeter of claim 1, wherein the end portion includes a connection portion and a tip portion, the connection portion having one end connected to the main body portion and the other end connected to the tip portion, the connection portion having a first receiving space, the tip portion having a second receiving space, the second receiving space being in communication with the first receiving space;

the detection sensor is a non-contact voltage induction sensor, and includes a detection portion extending from a first accommodation space of the connection portion to a second accommodation space of the tip portion.

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