CN211603516U

CN211603516U - Circuit on-off test pen

Info

Publication number: CN211603516U
Application number: CN201922482055.1U
Authority: CN
Inventors: 邓一辉; 韩玉争; 杨永栋; 刘晓东
Original assignee: Optofidelity High Tech Zhuhai Ltd
Current assignee: Optofidelity High Tech Zhuhai Ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-09-29
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses and provides a small, light in weight, convenient to carry, safe in utilization's circuit break-make test pen. The utility model comprises a test circuit, which comprises an inductance coil L, a first triode VT1, a second triode VT2, a third triode VT3, an LED indicator light LED and a DC power supply Vcc; the collector of the first triode VT1, the collector of the second triode VT2 and the anode of the LED indicator lamp LED are all electrically connected with the anode of the direct-current power supply Vcc, the emitter of the first triode VT1 is electrically connected with the base of the second triode VT2, the emitter of the second triode VT2 is electrically connected with the base of the third triode VT3, the cathode of the LED indicator lamp LED is electrically connected with the collector of the third triode VT3, and the emitter of the third triode VT3 is electrically connected with the cathode of the direct-current power supply Vcc; one end of the inductance coil L is electrically connected with the metal probe, and the other end of the inductance coil L is electrically connected with the base electrode of the first triode VT 1. The utility model discloses be applied to the technical field of circuit break-make test.

Description

Circuit on-off test pen

Technical Field

The utility model relates to a test pen, in particular to circuit break-make test pen.

Background

The tools commonly used to troubleshoot on-off failures of electrical devices have test pens and multimeters. The known test pencil is composed of test contact, current-limiting resistor, neon tube, metal spring and hand-touch electrode which are connected in series. The universal meter is large in size and weight, and is not easy to carry about in occasions with severe working environments, such as underground coal mines and drill rigs. Maintenance personnel often can not judge the position of a conductor open circuit point by using simple detection tools such as a universal meter or a test pencil without damaging an insulating layer of the electric wire and the electric cable, and the damage of the insulating layer not only causes the electric wire and the electric cable to lose application value, but also can bring hidden dangers to safety.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art not enough, provide a circuit break-make test pen small, light in weight, convenient to carry, safe in utilization.

The utility model adopts the technical proposal that: the utility model comprises a shell, a test circuit, an indicator light and a metal probe, wherein the test circuit is arranged in the shell, the indicator light is arranged on the shell and is electrically connected with the test circuit, the rear end of the metal probe is arranged in the shell and is electrically connected with the test circuit, and the front end of the metal probe extends out of the shell; the test circuit comprises an inductance coil L, a first triode VT1, a second triode VT2, a third triode VT3, an LED indicator light LED and a direct-current power supply Vcc; a collector of the first triode VT1, a collector of the second triode VT2 and an anode of the LED indicator light LED are all electrically connected with an anode of the DC power supply Vcc, an emitter of the first triode VT1 is electrically connected with a base of the second triode VT2, an emitter of the second triode VT2 is electrically connected with a base of the third triode VT3, a cathode of the LED indicator light LED is electrically connected with a collector of the third triode VT3, and an emitter of the third triode VT3 is electrically connected with a cathode of the DC power supply Vcc; one end of the inductance coil L is electrically connected with the metal probe, and the other end of the inductance coil L is electrically connected with the base electrode of the first triode VT 1.

Further, the first transistor VT1, the second transistor VT2, and the third transistor VT3 are all C945 transistors.

Further, the indicator light is arranged on one side of the lower end of the shell.

Further, the inductance value of the inductor L is 10 mH.

Further, the direct current power supply Vcc adopts a 3V direct current power supply.

The utility model has the advantages that: because the utility model adopts the design of the induction coil, the utility model comprises a shell, a test circuit, an indicator light and a metal probe, wherein the test circuit is arranged in the shell, the indicator light is arranged on the shell and is electrically connected with the test circuit, the rear end of the metal probe is arranged in the shell and is electrically connected with the test circuit, and the front end of the metal probe extends out of the shell; the test circuit comprises an inductance coil L, a first triode VT1, a second triode VT2, a third triode VT3, an LED indicator light LED and a direct-current power supply Vcc; a collector of the first triode VT1, a collector of the second triode VT2 and an anode of the LED indicator light LED are all electrically connected with an anode of the DC power supply Vcc, an emitter of the first triode VT1 is electrically connected with a base of the second triode VT2, an emitter of the second triode VT2 is electrically connected with a base of the third triode VT3, a cathode of the LED indicator light LED is electrically connected with a collector of the third triode VT3, and an emitter of the third triode VT3 is electrically connected with a cathode of the DC power supply Vcc; the one end of inductance coils L with the metal probe electricity is connected, inductance coils L's the other end with first triode VT 1's base electricity is connected, so, the utility model discloses small, light in weight, convenient to carry, safe in utilization can judge the position of conductor open circuit point under the condition of not destroying wire and cable insulating layer, need not destroy the insulating layer, can not make the wire and cable lose using value.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a functional block diagram of the test circuit 2.

Detailed Description

As shown in fig. 1 and fig. 2, in this embodiment, the present invention includes a housing 1, a test circuit 2, an indicator light 3, and a metal probe 4, wherein the test circuit 2 is disposed in the housing 1, the indicator light 3 is disposed on the housing 1 and electrically connected to the test circuit 2, a rear end of the metal probe 4 is disposed in the housing 1 and electrically connected to the test circuit 2, and a front end of the metal probe 4 extends out of the housing 1; the test circuit 2 comprises an inductance coil L, a first triode VT1, a second triode VT2, a third triode VT3, an LED indicator light LED and a direct-current power supply Vcc; a collector of the first triode VT1, a collector of the second triode VT2 and an anode of the LED indicator light LED are all electrically connected with an anode of the DC power supply Vcc, an emitter of the first triode VT1 is electrically connected with a base of the second triode VT2, an emitter of the second triode VT2 is electrically connected with a base of the third triode VT3, a cathode of the LED indicator light LED is electrically connected with a collector of the third triode VT3, and an emitter of the third triode VT3 is electrically connected with a cathode of the DC power supply Vcc; one end of the inductance coil L is electrically connected with the metal probe 4, and the other end of the inductance coil L is electrically connected with the base electrode of the first triode VT 1. When the induction coil L does not sense an electric signal, the base current of the third triode VT3 is 0, so that the third triode VT3 cuts off the loop current, and the LED indicator light is not on; when the inductance coil L induces an electric signal, a weak current signal is amplified by the first triode VT1 and the second triode VT2, the base current of the third triode VT3 is not 0, so that the third triode VT3 conducts loop current, and the LED indicates light.

In this embodiment, the first transistor VT1, the second transistor VT2, and the third transistor VT3 are all C945 transistors.

In this embodiment, the indicator lamp 3 is provided at one side of the lower end of the housing 1.

In this embodiment, the inductance value of the inductor L is 10 mH.

In this embodiment, the dc power Vcc is a 3V dc power.

In this embodiment, during the use, under the electrified condition of wire, the line breakpoint, cable one end is electrified, and under the uncharged or the weak voltage's of area condition of the other end of cable, the breakpoint position can be detected fast.

The utility model discloses be applied to the technical field of circuit break-make test.

While the embodiments of the present invention have been described in terms of practical embodiments, they are not intended to limit the scope of the invention, and modifications of the embodiments and combinations with other embodiments will be apparent to those skilled in the art in light of the present description.

Claims

1. The utility model provides a circuit break-make test pen, includes shell (1), test circuit (2), pilot lamp (3), metal probe (4), test circuit (2) set up in shell (1), pilot lamp (3) set up on shell (1) and with test circuit (2) electricity is connected, the rear end of metal probe (4) sets up in shell (1) with test circuit (2) electricity is connected, the front end of metal probe (4) is followed stretch out in shell (1), its characterized in that: the test circuit (2) comprises an inductance coil (L), a first triode (VT 1), a second triode (VT 2), a third triode (VT 3), an LED indicator Lamp (LED) and a direct current power supply (Vcc); a collector electrode of the first triode (VT 1), a collector electrode of the second triode (VT 2) and a positive electrode of the LED indicator Light (LED) are all electrically connected with a positive electrode of the direct current power supply (Vcc), an emitter electrode of the first triode (VT 1) is electrically connected with a base electrode of the second triode (VT 2), an emitter electrode of the second triode (VT 2) is electrically connected with a base electrode of the third triode (VT 3), a negative electrode of the LED indicator Light (LED) is electrically connected with a collector electrode of the third triode (VT 3), and an emitter electrode of the third triode (VT 3) is electrically connected with a negative electrode of the direct current power supply (Vcc); one end of the inductance coil (L) is electrically connected with the metal probe (4), and the other end of the inductance coil (L) is electrically connected with the base electrode of the first triode (VT 1).

2. The on-off circuit test pen of claim 1, wherein: the first triode (VT 1), the second triode (VT 2) and the third triode (VT 3) are all C945 triodes.

3. The on-off circuit test pen of claim 1, wherein: the indicator light (3) is arranged on one side of the lower end of the shell (1).

4. The on-off circuit test pen of claim 1, wherein: the inductance value of the inductance coil (L) is 10 mH.

5. The on-off circuit test pen of claim 1, wherein: the direct current power supply (Vcc) adopts a 3V direct current power supply.