CN110118886B

CN110118886B - Universal meter test pen with live warning and locking functions

Info

Publication number: CN110118886B
Application number: CN201910421303.3A
Authority: CN
Inventors: 翟常营; 顾秋斌; 徐瀚; 马红星
Original assignee: CNNC Fujian Nuclear Power Co Ltd
Current assignee: CNNC Fujian Nuclear Power Co Ltd
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2021-06-29
Anticipated expiration: 2039-05-21
Also published as: CN110118886A

Abstract

The invention provides a multimeter test pen with the functions of live warning and locking, which comprises an alarm loop, an electricity testing loop and a test loop. The alarm loop is formed by connecting a battery with a light-emitting diode, a buzzer and an optocoupler relay normally-open node in series in sequence. The electricity testing loop is formed by connecting a first meter pen with a current-limiting resistor, an optical coupling relay, a universal meter and a second meter pen in series in sequence. The test loop is formed by sequentially connecting a first meter pen with a normally closed node of the optocoupler relay, a test button, a universal meter and a second meter pen in series. The technical scheme of the invention can effectively avoid the risk brought by misusing the gears of the universal meter or mismeasuring points. In addition, the technical scheme provided by the invention can completely replace the traditional test pen, is matched with a commercially available mainstream multimeter and an insulation meter, and can be directly replaced and used.

Description

Universal meter test pen with live warning and locking functions

Technical Field

The invention belongs to the technical field of voltage and resistance value measurement, and particularly relates to a multimeter test pen with live-line early warning and locking functions.

Background

The current universal meter test pen is ordinary test pen, only possesses the function of connecting measurand and universal meter, and this kind of pen-shape metre exists following not enoughly: (1) when the voltage value needs to be measured in the control loop, the current gear, the on-off gear or the resistance gear may be mistakenly used due to errors, the conduction of the measured loop causes the accidental action of the control function, and the consequences of the stop of the production line, the trip of the generator set, the trip of the power transmission line and the like are caused under severe conditions. (2) When the voltage value needs to be measured in the power supply loop, the current gear, the on-off gear or the resistance gear may be mistakenly used due to errors, the power supply short circuit is caused by the conduction of the measured loop, and the consequences of power supply loss, equipment damage, personal injury and the like are caused under severe conditions. (3) When the resistance or the on-off of the loop needs to be measured, the measured object may be charged accidentally due to the state of the device, and the like, which causes the results to be the same as (1) and (2). (4) When the resistance or on-off of the loop needs to be measured, the electrified loop is measured by mistake, and the consequences are the same as (1) and (2).

Due to inherent limitations of people, human errors cannot be completely avoided, and once serious consequences are caused by using wrong gears or measuring wrong measuring points by errors, the events of tripping a generator, protecting and controlling misoperation and the like caused by too many multimeter gear errors or measuring point errors occur in the power industry. Therefore, a novel test pen is urgently needed to be designed.

Disclosure of Invention

The invention aims to solve the technical problem of providing a multimeter test pen with live warning and locking functions, and avoiding serious consequences caused by human errors.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a multimeter test pen with an electrified early warning and locking function comprises an alarm loop, an electricity testing loop and a test loop.

The alarm loop is formed by connecting a battery with a light-emitting diode, a buzzer and an optocoupler relay normally-open node in series in sequence.

The electricity testing loop is formed by connecting a first meter pen with a current-limiting resistor, an optical coupling relay, a universal meter and a second meter pen in series in sequence.

The test loop is formed by sequentially connecting a first meter pen with a normally closed node of the optocoupler relay, a test button, a universal meter and a second meter pen in series.

The electricity testing loop is further provided with an optocoupler relay locking node, and the first meter pen is sequentially connected with the current-limiting resistor, the optocoupler relay locking node, the universal meter and the second meter pen in series.

The latching node of the optocoupler relay is a normally open point and is used for self-holding after the optocoupler relay acts.

The normally open node of the optocoupler relay is a normally open point, the buzzer alarms after the normally open node of the optocoupler relay is closed, and meanwhile, the light emitting diode is turned on.

And a normally closed node of the optocoupler relay is a normally closed point. When the object to be tested is electrified, the normally closed node of the optocoupler relay is disconnected, and the test loop is locked. Even press the test button, because optical coupling relay shutting node is closed, optical coupling relay still keeps the action state, and test circuit is by optical coupling relay normally closed node shutting, and test circuit can not switch on.

The buzzer and the light emitting diode are integrated in an independent module, and the module is independently powered by a button power supply and is fixed with the test wire into a whole.

And the contact resistance between the normally closed node of the optocoupler relay and the test button is not higher than 0.1 omega.

The light emitting diode is a red light emitting diode.

The current-limiting resistor is matched with the optical coupler technology in a mode selection mode, so that the action sensitivity of the optical coupler is met, and the safety of a tested loop is guaranteed at the same time.

The beneficial effects obtained by the invention are as follows:

when the electric testing point is contacted, an audible and visual alarm can be sent through the buzzer and the light emitting diode, the button is not pressed at the moment, the testing loop is not conducted, the power supply short circuit and the control loop conduction can not be caused, and the risk caused by misusing the gear of the multimeter or mistesting the testing point can be effectively avoided. In addition, the technical scheme provided by the invention can completely replace the traditional test pen, is matched with a commercially available mainstream multimeter and an insulation meter, and can be directly replaced and used.

Drawings

FIG. 1 is a schematic diagram of a multimeter test pen circuit with live warning and lockout functions;

in the figure: 1 is a battery; 2 is a light emitting diode; 3 is a buzzer; 4 is an optical coupling relay locking node; 5 is a test button; 6 is an optical coupling relay; 7 is a current limiting resistor; 8 is normally closed node of the optical coupling relay; 9 is a normally open node of the optocoupler relay; 10 is a multimeter, 11 is a first meter pen, and 12 is a second meter pen.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments.

As shown in FIG. 1, the invention provides a multimeter test pen with live-line early warning and locking functions, which comprises an alarm loop, an electricity testing loop and a test loop.

The alarm loop is formed by connecting a battery 1 with a light-emitting diode 2, a buzzer 3 and an optocoupler relay normally-open node 9 in series in sequence.

The electricity testing loop is formed by connecting a first meter pen 11 with a current-limiting resistor 7, an optical coupling relay 6, a universal meter 10 and a second meter pen 12 in series in sequence.

The test loop is formed by connecting a first meter pen 11 with a normally closed node 8 of an optocoupler relay, a test button 5, a universal meter 10 and a second meter pen 12 in series.

The electricity testing loop is further provided with an optocoupler relay locking node 4, and the first meter pen 11 is connected with a current limiting resistor 7, an optocoupler relay 6, the optocoupler relay locking node 4, a universal meter 10 and a second meter pen 12 in series in sequence.

The optocoupler relay locking node 4 is a normally open point and is used for self-holding after the optocoupler relay 6 acts.

The optocoupler relay normally-open node 9 is a normally-open point, the buzzer 3 alarms after the optocoupler relay normally-open node 9 is closed, and meanwhile, the light-emitting diode 2 is bright.

And the normally closed node 8 of the optocoupler relay is a normally closed point. When the object to be tested is electrified, the normally closed node 8 of the optocoupler relay is disconnected, and the test loop is locked. Even press test button 5, because opto-coupler relay shutting node 4 is closed, opto-coupler relay 6 still keeps the action state, and the test circuit is blocked by opto-coupler relay normally closed node 8, and the test circuit can not switch on.

The buzzer 3 and the light emitting diode 2 are integrated in an independent module, and the module is independently powered by a button power supply and is fixed with the test wire into a whole.

And the contact resistance of the normally closed node 8 of the optocoupler relay and the test button 5 is not higher than 0.1 omega.

The current-limiting resistor 7 is matched with the optical coupler technology in a model selection mode, so that the action sensitivity of the optical coupler is met, and the safety of a tested loop is ensured.

The light emitting diode 2 is a red light emitting diode.

The technical scheme of the invention has the following beneficial effects:

Claims

1. The utility model provides a universal meter test pen that possesses electrified early warning and shutting function which characterized in that: the testing circuit comprises an alarm circuit, an electricity testing circuit and a testing circuit, wherein the alarm circuit is formed by sequentially connecting a battery (1) with a light emitting diode (2), a buzzer (3) and an optocoupler relay normally-open node (9) in series, the electricity testing circuit is formed by sequentially connecting a meter pen I (11) with a current-limiting resistor (7), an optocoupler relay (6), a multimeter (10) and a meter pen II (12) in series, and the testing circuit is formed by sequentially connecting the meter pen I (11) with the optocoupler relay normally-closed node (8), a testing button (5), the multimeter (10) and the meter pen II (12) in series; the electricity testing loop is also provided with an optocoupler relay locking node (4), and the first meter pen (11) is sequentially connected in series with the current limiting resistor (7), the optocoupler relay (6), the optocoupler relay locking node (4), the universal meter (10) and the second meter pen (12); the optocoupler relay locking node (4) is a normally open point; when the object to be tested is electrified, the normally closed node (8) of the optocoupler relay is disconnected, and a test loop is locked; even press test button (5), because opto-coupler relay shutting node (4) are closed, opto-coupler relay (6) still keep the action state, the test return circuit is blocked by opto-coupler relay normally closed node (8), and the test return circuit can not switch on.

2. The multimeter test pen with live warning and lockout functions of claim 1, wherein: the buzzer (3) and the light-emitting diode (2) are integrated in an independent module, and the module is independently powered by a button power supply and is fixed with the test lead into a whole.

3. The multimeter test pen with live warning and lockout functions of claim 1, wherein: and the contact resistance between the normally closed node (8) of the optocoupler relay and the test button (5) is not higher than 0.1 omega.

4. The multimeter test pen with live warning and lockout functions of claim 1, wherein: the light emitting diode (2) is a red light emitting diode.

5. The multimeter test pen with live warning and lockout functions of claim 1, wherein: the current-limiting resistor (7) is matched with the optical coupler technology in a mode selection mode, so that the action sensitivity of the optical coupler is met, and the safety of a tested loop is guaranteed.