阅读说明：本技术 一种防误操作的万用表及其使用方法 (anti-misoperation multimeter and use method thereof ) 是由 邓德茂 周龙兴 纵瑞瑾 肖力 郑喆 代运滔 杨令 黄岗 王堃 任飞 金基伟 王 于 2019-09-30 设计创作，主要内容包括：本发明公开了一种防误操作的万用表及其使用方法,包括防误板,防误板安装于万用表的壳体上,防误板上设置有防误板保护电路,防误板保护电路包括触点监视电路、表笔电压AD转换电路、CPU监视电路、测试电路、语音播报电路和LED指示电路,触点监视电路、表笔电压AD转换电路、测试电路、语音播报电路和LED指示电路连接到CPU监视电路,触点监视电路连接到万用表表笔插孔、红色表笔和黑色表笔,表笔电压AD转换电路和测试电路均连接到红色表笔和黑色表笔。使用本保护电路的数字万用表,可有效引导用户正确的使用万用表,效防止误操作带来的各种事故,包括万用表的损坏以及人身伤害等。(The invention discloses an anti-misoperation multimeter and a use method thereof, wherein the anti-misoperation multimeter comprises an anti-misoperation plate, the anti-misoperation plate is arranged on a shell of the multimeter, the anti-misoperation plate is provided with an anti-misoperation plate protection circuit, the anti-misoperation plate protection circuit comprises a contact monitoring circuit, a stylus voltage AD conversion circuit, a CPU monitoring circuit, a test circuit, a voice broadcast circuit and an LED indicating circuit, the contact monitoring circuit, the stylus voltage AD conversion circuit, the test circuit, the voice broadcast circuit and the LED indicating circuit are connected to the CPU monitoring circuit, the contact monitoring circuit is connected to a stylus jack, a red stylus and a black stylus of the multimeter, and the stylus voltage AD conversion circuit and the test circuit are connected to the red stylus and the black stylus. The digital multimeter using the protection circuit can effectively guide a user to correctly use the multimeter, effectively prevent various accidents caused by misoperation, including damage to the multimeter, personal injury and the like.)

1. The utility model provides a prevent universal meter of maloperation which characterized in that: including preventing the mistake board, prevent that the mistake board is installed on the casing of universal meter, prevent being provided with on the mistake board and prevent mistake board protection circuit, prevent mistake board protection circuit including contact monitoring circuit, pen-shape metre voltage AD converting circuit, CPU monitoring circuit, test circuit, voice broadcast circuit and LED indicating circuit, contact monitoring circuit, pen-shape metre voltage AD converting circuit, test circuit, voice broadcast circuit and LED indicating circuit are connected to CPU monitoring circuit, contact monitoring circuit is connected to universal meter pen-shape metre jack, red pen-shape metre and black pen-shape metre, pen-shape metre voltage AD converting circuit and test circuit all are connected to red pen-shape metre and black pen-shape metre.

2. an anti-misoperation multimeter according to claim 1, wherein: the CPU monitoring circuit has a microprocessor.

3. A method of using a multimeter for error protection according to any one of claims 1-2, wherein: the method comprises the following steps:

Step 1, installing an error prevention plate on a multimeter, arranging a monitoring contact circuit, a test circuit, an AD conversion circuit, a CPU monitoring circuit, a voice broadcasting circuit and an LED indicating circuit on the error prevention plate, and sharing a power supply with the multimeter by the error prevention plate;

Step 2, when a universal meter is used for measurement, a power switch of the universal meter is pressed down, and the error prevention board protection circuit is started;

step 3, the CPU monitoring circuit analyzes according to a contact logic signal returned by the contact circuit, judges the plug insertion correctness of the current multimeter stylus and prompts which type of measurement the current multimeter is used for according to the jack in which the plug is inserted;

step 4, after the error prevention board circuit starts working, monitoring whether a meter pen plug is inserted into a meter pen jack of the multimeter or not, and after the meter pen jack of the multimeter is normally inserted into the plug, prompting a user of the currently measured measurement type by the CPU monitoring circuit according to a logic signal provided by the contact monitoring circuit;

step 5, after monitoring whether the jacks of the multimeter are correctly inserted, if the CPU monitoring circuit is V/omega or COM according to the returned logic type, prompting a user to insert the other end of the test pen into a corresponding jack of the error prevention plate;

Step 6, when the jacks V/omega and COM of the multimeter are normally inserted and the gears are shifted to corresponding gears, the CPU monitoring circuit automatically starts the AD conversion circuit to monitor the voltage of the meter pen after the jacks of the error prevention board are normally inserted;

Step 7, when the multimeter is in a voltage range or a current range, the meter pen does not have voltage output; the method comprises the following steps that the multimeter is in a resistance gear or an on-off gear, a voltage output is arranged on a meter pen, the voltage of the meter pen is monitored through the method, and whether the current gear is in the voltage gear or the resistance/on-off gear is clearly distinguished;

Step 8, after the CPU monitoring circuit starts the AD conversion circuit, the obtained measured voltage value is lower than a judgment value, the voice prompt circuit prompts that the current measurement is a voltage test, and a voice broadcast prompt tone 'test gear is a voltage test gear, please confirm';

step 9, if the monitored voltage value is larger than the judgment value, prompting that the current gear is a resistance gear or a time on-off gear, and automatically carrying out on-off test for set time, wherein the current gear is a resistance gear or a time on-off gear, and the voice broadcast prompting sound is 'a test gear is a resistance/on-off gear', the voice broadcast is actively prompted after the drive circuit finishes measuring the set time, and the prompting sound is 'a sound of a buzzer of a universal meter', and the current gear is an on-off gear; if not, the resistance is a resistance file, please confirm, and retest the please ampere test button ";

Step 10, after all operations are finished, a user must wait for confirmation, and then the error-preventing board meter pen can be pulled out for relevant tests;

Step 11, if the test pen is not pulled out for a long time for measurement after confirmation, the CPU monitoring circuit can actively sound, and after 10 times of continuous measurement, the power supply circuit can be actively cut off for protection operation;

And step 12, after the whole measurement is finished, the power supply of the multimeter is turned off, and meanwhile, a pen point of the multimeter is inserted into the jack of the anti-misoperation plate.

Technical Field

The invention belongs to the technical field of anti-misoperation equipment of multimeters, and relates to an anti-misoperation multimeter and a use method thereof.

Background

the universal meter has powerful functions, is light and portable, and is widely applied to various electrician industries. But current universal meter lacks the function of preventing mistake, and easy in use causes the accident occasionally because of the misuse, if in measuring the malfunctioning exit contact voltage process of circuit breaker protection, the mistake is measured universal meter resistance shelves as the voltage shelves, leads to the malfunctioning exit contact short circuit of circuit breaker protection, causes the malfunctioning protection to start, trips the switch, and similar this kind of accident has been reacted many times in electric power system.

disclosure of Invention

the technical problem to be solved by the invention is as follows: the utility model provides a multimeter and a using method thereof for preventing misoperation, which are used for solving the problems in the prior art.

The technical scheme adopted by the invention is as follows: the utility model provides a prevent maloperation's universal meter, including preventing the mistake board, prevent that the mistake board is installed on the casing of universal meter, prevent being provided with on the mistake board and prevent mistake board protection circuit, prevent mistake board protection circuit including contact monitoring circuit, pen-shape metre voltage AD converting circuit, CPU monitoring circuit, test circuit, voice broadcast circuit and LED indicating circuit, contact monitoring circuit, pen-shape metre voltage AD converting circuit, test circuit, voice broadcast circuit and LED indicating circuit are connected to CPU monitoring circuit, contact monitoring circuit is connected to universal meter pen-shape metre jack, red pen-shape metre and black pen-shape metre, pen-shape metre voltage AD converting circuit and test circuit all are connected to red pen-shape metre and black pen-shape metre.

The CPU monitoring circuit has a microprocessor.

A method of using a multimeter for preventing misoperations, the method comprising the steps of:

step 1, installing an error prevention plate on a multimeter, arranging a monitoring contact circuit, a test circuit, an AD conversion circuit, a CPU monitoring circuit, a voice broadcasting circuit and an LED indicating circuit on the error prevention plate, and sharing a power supply with the multimeter by the error prevention plate;

Step 2, when a universal meter is used for measurement, a power switch of the universal meter is pressed down, and the error prevention board protection circuit is started;

Step 3, the CPU monitoring circuit analyzes according to a contact logic signal returned by the contact circuit, judges the plug insertion correctness of the current multimeter stylus and prompts which type of measurement the current multimeter is used for according to the jack in which the plug is inserted;

step 4, after the error prevention board circuit starts working, monitoring whether a meter pen plug is inserted into a meter pen jack of the multimeter or not, and after the meter pen jack of the multimeter is normally inserted into the plug, prompting a user of the currently measured measurement type by the CPU monitoring circuit according to a logic signal provided by the contact monitoring circuit;

Step 5, after monitoring whether the jacks of the multimeter are correctly inserted, if the CPU monitoring circuit is V/omega or COM according to the returned logic type, prompting a user to insert the other end of the test pen into a corresponding jack of the error prevention plate;

step 6, when the jacks V/omega and COM of the multimeter are normally inserted and the gears are shifted to corresponding gears, the CPU monitoring circuit automatically starts the AD conversion circuit to monitor the voltage of the meter pen after the jacks of the error prevention board are normally inserted;

Step 7, when the multimeter is in a voltage range or a current range, the meter pen does not have voltage output; the method comprises the following steps that the multimeter is in a resistance gear or an on-off gear, a voltage output is arranged on a meter pen, the voltage of the meter pen is monitored through the method, and whether the current gear is in the voltage gear or the resistance/on-off gear is clearly distinguished;

Step 8, after the CPU monitoring circuit starts the AD conversion circuit, the obtained measured voltage value is lower than a judgment value, the voice prompt circuit prompts that the current measurement is a voltage test, and a voice broadcast prompt tone 'test gear is a voltage test gear, please confirm';

Step 9, if the monitored voltage value is larger than the judgment value, prompting that the current gear is a resistance gear or a time on-off gear, and automatically carrying out on-off test for set time, wherein the current gear is a resistance gear or a time on-off gear, and the voice broadcast prompting sound is 'a test gear is a resistance/on-off gear', the voice broadcast is actively prompted after the drive circuit finishes measuring the set time, and the prompting sound is 'a sound of a buzzer of a universal meter', and the current gear is an on-off gear; if not, the resistance is a resistance file, please confirm, and retest the please ampere test button ";

step 10, after all operations are finished, a user must wait for confirmation, and then the error-preventing board meter pen can be pulled out for relevant tests;

step 11, if the test pen is not pulled out for a long time for measurement after confirmation, the CPU monitoring circuit can actively sound, and after 10 times of continuous measurement, the power supply circuit can be actively cut off for protection operation;

step 12, if the whole measurement is completed, the power supply of the multimeter is turned off, and meanwhile, the stylus of the multimeter is inserted into the jack of the anti-error board, so that the multimeter can be stored and tested next time.

the invention has the beneficial effects that: compared with the prior art, the anti-misoperation board is additionally arranged on the existing multimeter, the anti-misoperation board is provided with the contact monitoring circuit, the meter pen voltage AD conversion circuit, the CPU monitoring circuit (comprising a microprocessor), the test circuit, the voice broadcast circuit and the LED indicating circuit, the CPU monitoring circuit carries out logic analysis judgment and voice prompt on the input contact monitoring signal through signals collected by the electric shock monitoring circuit and the meter pen voltage AD conversion circuit, whether the AD conversion circuit is started to measure the voltage of the meter pen point of the multimeter is determined according to the type of the input contact signal, and the digital multimeter using the protection circuit can effectively guide a user to correctly use the multimeter, effectively prevent various accidents caused by misoperation, including damage of the multimeter, personal injury and the like.

Drawings

FIG. 1 is a schematic design view of a mis-operation prevention multimeter of the present invention;

FIG. 2 is a functional block diagram of an anti-tamper multimeter of the present invention;

Detailed Description

the invention is further described with reference to the accompanying drawings and specific embodiments.