阅读说明：本技术 一种带有电流测量防错装置的万用表 (Universal meter with current measurement error-proofing device ) 是由 吕义科 陈嘉俊 叶德富 柳军停 吴洪波 张俊杰 于 2019-10-16 设计创作，主要内容包括：本发明涉及电气测量安全技术领域,更具体地,涉及一种带有电流测量防错装置的万用表,包括万用表,所述万用表上用于测量电流的表笔插孔处装设有电流测量防错装置,所述电流测量防错装置包括触发结构和声光报警电路,在非测量状态下,所述声光报警电路的触发端与触发结构紧密接触。本发明使用方便,能够减少由于误接电流检测插孔而造成的万用表或测量设备短路的事故,提高万用表的使用安全性。(The invention relates to the technical field of electrical measurement safety, in particular to a multimeter with a current measurement error-proofing device, which comprises a multimeter, wherein the current measurement error-proofing device is arranged at a meter pen jack for measuring current on the multimeter, the current measurement error-proofing device comprises a trigger structure and an acousto-optic alarm circuit, and the trigger end of the acousto-optic alarm circuit is in close contact with the trigger structure in a non-measurement state. The universal meter is convenient to use, can reduce the short circuit accident of the universal meter or measuring equipment caused by mistakenly connecting the current detection jack, and improves the use safety of the universal meter.)

1. The utility model provides a universal meter with current measurement mistake proofing device, includes universal meter (1), its characterized in that, the current measurement mistake proofing device has been installed to pen-shape metre jack (11) department that is used for measuring current on universal meter (1), current measurement mistake proofing device is including triggering structure (2) and acousto-optic warning circuit (4), under non-measuring state, the trigger end and the trigger structure (2) in close contact with of acousto-optic warning circuit (4).

2. Multimeter with current measurement error protection according to claim 1, wherein the sound and light alarm circuit (4) comprises: the device comprises a battery, a travel switch SQ1, a relay coil KM1, a relay coil KM2, a relay normally closed switch KM1, a relay normally open switch KM1, a relay normally open switch KM2, a reset button SB1 and an audible and visual alarm prompting device;

one end of the travel switch SQ1 is electrically connected with the positive electrode of the battery, and the other end of the travel switch SQ1 is electrically connected with the relay normally-closed switch KM1, the reset button SB1, the relay normally-open switch KM1 and the relay normally-open switch KM2 respectively;

one end of the relay coil KM2 is electrically connected with the negative electrode of the battery, and the other end of the relay coil KM2 is electrically connected with the relay normally-closed switch KM 1;

one end of the relay coil KM1 is electrically connected with the negative electrode of the battery, and the other end of the relay coil KM1 is electrically connected with the reset button SB1 and the relay normally-open switch KM1 respectively;

one end of the sound-light alarm prompting device is electrically connected with the negative electrode of the battery, and the other end of the sound-light alarm prompting device is electrically connected with a normally open switch KM2 of the relay.

3. The multimeter with the current measurement error-proofing device according to claim 2, wherein the audible and visual alarm prompting device comprises an indicator light L1 and a buzzer B1; one end of the indicator lamp L1 is electrically connected with a relay normally-open switch KM2, and the other end of the indicator lamp L1 is electrically connected with one end of a buzzer B1; the other end of the buzzer B1 is electrically connected with the negative electrode of the battery.

4. A multimeter having a current measurement error protection arrangement according to claim 3, wherein the stroke switch SQ1 is the trigger terminal of the audible and visual alarm circuit (4), both the stroke switch SQ1 and the reset button SB1 are located on the panel of the multimeter (1).

5. Multimeter with current measurement error protection according to claim 1, wherein the trigger structure (2) is rotatably connected to the multimeter (1).

6. The multimeter with the current measurement error-proofing device according to claim 5, wherein the trigger structure (2) is a cover body, and the cover body is connected with a panel of the multimeter (1) through a rotating shaft.

7. The multimeter with the current measurement error-proofing device according to claim 6, wherein a case (3) for protecting the sound and light alarm circuit (4) is arranged in the multimeter (1), and the case (3) is fixedly connected with the multimeter (1).

8. The multimeter having a current measurement error proofing device according to claim 7, wherein a buckle body (5) is provided between the cover body and the case (3).

9. The multimeter having a current measurement error proofing device according to claim 6, wherein the cover body is provided with a plurality of identification cards (21) for prompting.

Technical Field

The invention relates to the technical field of electrical measurement safety, in particular to a multimeter with a current measurement error-proofing device.

Background

The multimeter is used as a measuring tool based on an electric power practitioner, along with the innovation of technology, the measuring precision is continuously improved, the testing function is continuously perfected, but the error-proof function of the multimeter is easily ignored. When a maintainer checks a relay protection device and a secondary circuit, if a stylus of the multimeter is mistakenly connected into a current detection jack when a voltage circuit is measured, the risks of PT voltage loss, protection actions, connection failure or tripping in and other important circuits can be caused, and the safe operation of a power system can be directly endangered. Although some current multimeters have error-proofing designs, the designs are complex and not beneficial to mass production.

Disclosure of Invention

The invention aims to overcome the defect that the existing error-proof design is quite complex, provides a multimeter with a current measurement error-proof device, is convenient to use, can reduce the short-circuit accident of the multimeter or measurement equipment caused by mistakenly connecting a current detection jack, and improves the use safety of the multimeter.

In order to solve the technical problems, the invention adopts the technical scheme that:

the utility model provides a universal meter with current measurement mistake proofing device, includes the universal meter, the current measurement mistake proofing device has been installed to the pen-shape metre jack department that is used for measuring current on the universal meter, current measurement mistake proofing device is including triggering structure and acousto-optic warning circuit, under non-measuring state, acousto-optic warning circuit's trigger end and trigger structure in close contact with.

The invention relates to a multimeter with a current measurement error-proofing device.A sound-light alarm circuit is used for warning maintainers before measurement so as to prevent error connection; the setting of trigger structure makes audible-visual alarm circuit just can be triggered when needing to use this pen-shape metre jack, and audible-visual alarm circuit will not triggered when need not to use this pen-shape metre jack, can eliminate unnecessary warning.

In order to make the acousto-optic warning circuit can effectively warn the maintainer, the acousto-optic warning circuit includes: the device comprises a battery, a travel switch SQ1, a relay coil KM1, a relay coil KM2, a relay normally closed switch KM1, a relay normally open switch KM1, a relay normally open switch KM2, a reset button SB1 and an audible and visual alarm prompting device;

one end of the travel switch SQ1 is electrically connected with the positive electrode of the battery, and the other end of the travel switch SQ1 is electrically connected with the relay normally-closed switch KM1, the reset button SB1, the relay normally-open switch KM1 and the relay normally-open switch KM2 respectively;

one end of the relay coil KM2 is electrically connected with the negative electrode of the battery, and the other end of the relay coil KM2 is electrically connected with the relay normally-closed switch KM 1;

one end of the relay coil KM1 is electrically connected with the negative electrode of the battery, and the other end of the relay coil KM1 is electrically connected with the reset button SB1 and the relay normally-open switch KM1 respectively;

one end of the sound-light alarm prompting device is electrically connected with the negative electrode of the battery, and the other end of the sound-light alarm prompting device is electrically connected with a normally open switch KM2 of the relay.

Specifically, the sound-light alarm prompting device comprises an indicator light L1 and a buzzer B1; one end of the indicator lamp L1 is electrically connected with a relay normally-open switch KM2, and the other end of the indicator lamp L1 is electrically connected with one end of a buzzer B1; the other end of the buzzer B1 is electrically connected with the negative electrode of the battery.

In order to enable the triggering structure to effectively trigger the audible and visual alarm prompting device through the travel switch, the travel switch SQ1 is the triggering end of an audible and visual alarm circuit, and the travel switch SQ1 and the reset button SB1 are both positioned on the panel of the multimeter.

In order to facilitate the use of the meter pen jack by a maintainer, the trigger structure is rotatably connected with the multimeter.

Specifically, the trigger structure is a cover body, and the cover body is connected with a panel of the multimeter through a rotating shaft.

In order to prevent the sound-light alarm circuit from being wound with other parts inside the universal meter, a shell used for protecting the sound-light alarm circuit is arranged in the universal meter, and the shell is fixedly connected with the universal meter.

In order to realize quick fastening and opening between the cover body and the shell, a fastening body is arranged between the cover body and the shell.

In order to more intuitively prompt the maintainers, a plurality of identification cards used for prompting are arranged on the cover body.

Compared with the prior art, the invention has the beneficial effects that:

(1) the acousto-optic alarm circuit is used for warning maintainers before measurement and preventing misconnection

(2) The cover body is rotationally connected with the panel of the multimeter, so that the cover body can cover the meter pen jack when the meter pen jack is not needed to be used, and misconnection is prevented; when needs use, open the lid through the rotation and trigger audible and visual alarm circuit to the suggestion maintainer prevents the misconnection.

(3) The travel switch SQ1 and the reset button SB1 are both arranged on the panel of the multimeter, so that the audible and visual alarm circuit can be triggered by opening and closing the travel switch SQ1, and then the audible and visual alarm is released through the reset button SB 1.

Drawings

FIG. 1 is a schematic diagram of a multimeter having a current measurement error proofing apparatus of the present invention.

Fig. 2 is a schematic structural view of the present invention when the cover is opened.

Fig. 3 is a schematic structural diagram of the current measurement error-proofing device of the present invention.

Fig. 4 is a perspective view of the current measurement error prevention apparatus of the present invention.

FIG. 5 is a circuit diagram of the acousto-optic alarm circuit of the present invention.

The graphic symbols are illustrated as follows:

the multifunctional electronic watch comprises a universal meter 1, a meter pen 11, a meter pen jack, a trigger structure 2, an identification card 21, a shell 3, a fixing bolt 31, an audible and visual alarm circuit 4 and a buckle body 5.

Detailed Description

The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.