Multi-function test pen and cable measurement method
technical field
The invention belongs to the technical field of electrical tools, and in particular relates to a multifunctional electric measuring pen and a cable measuring method.
Background technique
Mechanical equipment lines often encounter line power outages. The existing electric test pen can only test whether the equipment and cables have voltage. Short circuit and other faults. But the multimeter is relatively expensive, and it is generally not equipped by non-professionals. At the same time, the multimeter also requires operators to have certain professional knowledge, which is inconvenient to use.
Contents of the invention
The embodiment of the present invention provides a multi-functional electric measuring pen and a cable measurement method to solve the problem that the existing electric measuring pen cannot test faults such as cable passage, open circuit, and short circuit, and it is inconvenient to use a multimeter to measure these faults.
The first aspect of the embodiment of the present invention provides a multifunctional electric measuring pen, including: a metal terminal, an insulating pen body, a resistor, a first light-emitting unit, a second light-emitting unit, a spring, a metal slot at the end of the pen, a display screen, a voltage Sensing unit, switch, power supply, test terminal, first crystal triode, second crystal triode and third crystal triode, the test terminal includes detachable pen clip, insulated wire and metal snap ring, and the insulated pen body is made of transparent made of material;
The resistance, the first light emitting unit, the second light emitting unit, the spring, the voltage sensing unit, the power supply, the first transistor, the second transistor and the third The transistor is arranged inside the insulating pen body, the display screen, the switch and the detachable pen holder are arranged outside the insulating pen body, one end of the insulated wire is connected to the detachable pen holder, The other end of the insulated wire is connected to the metal snap ring;
The metal terminal is arranged at one end of the insulating pen body, the metal slot of the tail of the pen is arranged at the other end of the insulating pen body, the metal terminal is connected to the first end of the switch, the The second end of the switch is connected to the resistor, the resistor is connected to the base of the first transistor, the emitter of the first transistor is connected to the base of the second transistor, and the emitter of the second transistor is connected to the base of the second transistor. The emitter is connected to the base of the third transistor, the collector of the third transistor is connected to one end of the first light-emitting unit, the collector of the first transistor, the collector of the second transistor The electrode, the other end of the first light-emitting unit, and the emitter of the third transistor are all connected to the pen tail metal slot through the spring, and the voltage sensing unit is arranged at both ends of the resistor. The display screen is connected to the voltage sensing unit; the third end of the switch is connected to the power supply, and the power supply is connected to the
A second light emitting unit, the second light emitting unit is connected to the metal slot of the tail of the pen through the spring.
In addition, in a specific example, the above-mentioned multifunctional electric measuring pen further includes an antistatic sleeve arranged outside the metal terminal.
In addition, in a specific example, the above-mentioned multifunctional electric measuring pen further includes a clip disposed outside the insulating pen body.
In addition, in a specific example, the metal end is detachably mounted on one end of the insulating pen body.
In addition, in a specific example, the first light emitting unit is a neon bulb, and the second light emitting unit is a light emitting diode.
Furthermore, in a specific example, the power source is a button battery.
Furthermore, in a specific example, the display screen is a digital display screen.
In addition, in a specific example, the surface of the insulating pen body is provided with anti-skid lines.
In addition, in a specific example, the top of the metal end is a flat head or a cross head.
The second aspect of the embodiment of the present invention provides a cable measurement method based on the above-mentioned multi-function electric measuring pen, including: when measuring whether the cable is electrified, connect the first end of the switch to the second end of the switch, and connect the The metal end is in contact with the cable; when the cable is not charged, when measuring the cable path or disconnection, short the live wire end and the neutral wire end of the cable together, and snap the metal snap ring of the test end to the metal end of the pen. In the card slot, connect the first end of the switch to the third end of the switch, touch the metal end to the other end of the live wire of the cable, and remove the detachable pen clip to connect the other end of the neutral wire of the cable; When the cable is not charged, when measuring whether the cable is grounded, snap the metal snap ring at the test end into the metal slot at the end of the pen, connect the first end of the switch to the third end of the switch, and touch the metal end cable, remove the detachable clip for grounding.
Compared with the prior art, the embodiment of the present invention has the following beneficial effects: the multifunctional electric measuring pen in the embodiment of the present invention includes a metal terminal, an insulating pen body, a resistor, a first light-emitting unit, a second light-emitting unit, a spring, and a pen tail Metal card slot, display screen, voltage sensing unit, switch, power supply, test terminal, first transistor, second transistor and third transistor, wherein the test terminal includes detachable pen clip, insulated wire and metal snap ring , measure the voltage of the cable by connecting the first end of the switch to the second end when it is charged, and measure the path and disconnection of the cable by connecting the first end and the third end of the switch when it is not charged , grounding status, etc. It integrates a variety of test functions to solve the problem that the existing electric test pen cannot test cable access, open circuit, short circuit and other faults, and it is inconvenient to use a multimeter to measure these faults, and it can be used
Carry it with you, take it out and use it immediately when needed, to meet the needs of practical applications.
