CN107765070A - A kind of Multifunction screw-driver with voltage tester and its test circuit - Google Patents
A kind of Multifunction screw-driver with voltage tester and its test circuit Download PDFInfo
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- CN107765070A CN107765070A CN201610675198.2A CN201610675198A CN107765070A CN 107765070 A CN107765070 A CN 107765070A CN 201610675198 A CN201610675198 A CN 201610675198A CN 107765070 A CN107765070 A CN 107765070A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
- G01R19/155—Indicating the presence of voltage
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Abstract
A kind of Multifunction screw-driver with voltage tester and its test circuit.The present invention relates to a kind of voltage test pencil, and it includes handwriting, testing needle, luminous tube, electric wire and crocodile clip；The testing needle is arranged on one end of handwriting, and the luminous tube is arranged in the other end of handwriting；The crocodile clip is connected by electric wire with handwriting；Detection circuit is provided with inside the handwriting.Compared to prior art by testing needle, the detection of multiple functions can be carried out, including whether loop turns on, the measurement of voltage class and positive pulse and negative pulse voltage etc..It is easy to use, without being shifted gears.Test electroprobe is easy to use, judge it is fast, can interpolate that in tested pilot in circuit either with or without open circuit loop or there is voltage, the state that short circuit, positive pulse, negative pulse or dolly battery are electrically charged.And the battery in itself handwriting can be full of in test is carried out.
Description
Technical field
The present invention relates to a kind of voltage test pencil, particularly a kind of voltage test pencil that can possess a variety of test functions；The present invention is also
Provide a kind of test circuit for voltage test pencil.
Background technology
Voltage test pencil is also test pencil, referred to as " electroprobe ".It is a kind of electrician tool, it is whether powered in electric wire for testing.And
In the application of existing voltage test pencil, also usually it is applied to the detection of the battery of automobile.
Referring to Fig. 1, its structural representation for the voltage test pencil of prior art.Existing voltage test pencil includes：Testing needle 1a,
Penholder 2a, bulb 3a, spring 4a, wire 5a and crocodile clip 6a.The bulb 3a is arranged on penholder 2a inside, the testing needle
1a is arranged on penholder 2a end, and one end of the testing needle is arranged on inside penholder, and by the spring 4a and penholder
Side one end connects.The crocodile clip 6a is by the wire 5a with being connected inside penholder.
Voltage test pencil in prior art one is easy to use, but can only test electric out of power, and function is single, using short to circuit
Road performance is strong, the present intelligent height of dolly.Easily to dolly just into false failure with to computer in dolly just into eternal hard defects.
For the defects of prior art one, prior art two provides a kind of multipurpose test system.Please refer to
Fig. 2, it is the structural representation of the test device in prior art two.Test device in prior art two is provided with multiple shelves
Position, can realize different test functions by adjusting different stalls.Although the multipurpose test system tool in prior art two
The advantages such as standby sensitive height, high impedance, short-circuit be low.
But following technological deficiency is still had in prior art two：Its it is anti-interference it is low, volume is big, it is inconvenient for operation,
Constantly to switch gear surely, and need to use using testing needle by both hands simultaneously, as extremely inconvenient using universal meter.
The content of the invention
The invention reside in the shortcomings that overcoming prior art with deficiency, there is provided a kind of Multifunction screw-driver with voltage tester simple to operate and its
Test circuit.
The present invention is realized by following technical scheme：A kind of detection circuit of voltage test pencil, including power supply, ground connection electricity
Pole, probe and loop detection module；The loop detection module includes：First resistor, second resistance, the 4th resistance, the 2nd LED
Lamp, the 6th diode and the 7th diode；
The positive pole of the power supply with probe by connecting；
The negative pole of the power supply passes sequentially through second resistance, the second LED, the 4th resistance and is connected with grounding electrode；It is described
Negative pole one end of second LED and the negative pole of power supply are connected, and second LED positive pole one end is connected by the 4th resistance and grounding electrode
Connect；
The negative pole of the power supply also passes sequentially through the 6th diode simultaneously, the 4th resistance is connected with grounding electrode；Described
Positive pole one end of six diodes and the negative pole of power supply connect, and negative pole one end of the 6th diode passes through the 4th resistance and grounding electrode
Connection；
The positive pole of 7th diode is connected with the 4th resistance, and negative pole connects with the probe.
Compared to prior art, circuit of the invention can be made whether the test in loop.Born when accessing extraneous out of power
During load, by the positive pole of power supply, probe, load, the 4th resistance and the second LED, loop is formed.By whether light second
LED judges whether loop turns on.
As a further improvement on the present invention, the loop detection module also includes the second triode, the 5th LED, the
Five resistance, the 7th resistance, the first voltage-regulator diode, the 8th diode, the second voltage-regulator diode and the 8th resistance；
The emitter-base bandgap grading of second triode connects with probe, and the colelctor electrode of the second triode passes through the 5th LED, the 5th electricity
Resistance is connected with grounding electrode；The base stage of second triode passes sequentially through the 7th resistance, the first voltage-regulator diode, the eight or two pole
Pipe and the second voltage-regulator diode are connected with grounding electrode；
One end of 8th resistance is connected with the probe, and the other end is connected with first voltage-regulator diode.
Further, when positive pulse voltage is higher than 13.5V, the second triode ON is made, electric current is by the 5th LED, the
Five resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the 8th diode, the first voltage-regulator diode, the second voltage stabilizing
Diode, eventually pass back to grounding electrode.
As a further improvement on the present invention, the loop detection module also includes the first diode, the second diode, the
Three diodes, the 4th diode, the 5th diode, rectifier bridge, the 3rd LED and 3rd resistor；
Negative pole and just in first diode, the second diode, the 3rd diode, the 4th diode and the 5th diode
Pole is sequentially connected, wherein, the positive pole positive pole with power supply and the probe connection simultaneously of first diode；5th diode
Negative pole be connected by the 4th resistance with grounding electrode；
The rectifier bridge has two exchange ends and two DC terminals；In described two exchange ends, one end and the 5th diode
Negative pole connection, the other end is grounded by 3rd resistor；In described two DC terminals, output one end by the 3rd LED with it is defeated
Enter end connection.
Further, when positive pulse or voltage are higher than 9.5V, pulse or current direction its cells.Work as supply voltage simultaneously
During higher than 2.5V, electric current is by the first diode, the second diode, the 3rd diode, the 4th diode, the 5th diode, group
Into bias current voltage stabilizing, the 6th diode, the 4th resistance, and return to grounding electrode.After the 4th resistive voltage is drawn high, bias current to rectification
Bridge, the 3rd LED is lighted, and grounding electrode is returned to by 3rd resistor.
As a further improvement on the present invention, the loop detection module also includes accompanying voltage rectifier；It is described to accompany repoussage
Current circuit includes the tenth resistance, the 6th LED, the first electric capacity, the 11st resistance and the 3rd voltage-regulator diode；
The probe passes sequentially through the tenth resistance, the 6th LED, the first electric capacity, the 11st resistance and is connected with grounding electrode；
The positive pole and the first capacitance connection of 3rd voltage-regulator diode, negative pole connect with probe.
Further, when each pulse voltage is passed through, the 6th LED can all be lighted.Pulse is judged by the 6th LED
Whether voltage passes through.
Present invention also offers a kind of voltage test pencil, and it includes handwriting, testing needle, luminous tube, electric wire and crocodile clip；The survey
Test point is arranged on one end of handwriting, and the luminous tube is arranged in the other end of handwriting；The crocodile clip passes through electric wire and handwriting
Connection；Detection circuit is provided with inside the handwriting；
The detection circuit includes power supply, grounding electrode, probe and loop detection module；The loop detection module bag
Include：First resistor, second resistance, the 4th resistance, the second LED, the 6th diode and the 7th diode；
The positive pole of the power supply with probe by connecting；
The negative pole of the power supply passes sequentially through second resistance, the second LED, the 4th resistance and is connected with grounding electrode；It is described
Positive pole one end of second LED and the negative pole of power supply are connected, and second LED negative pole one end is connected by the 4th resistance and grounding electrode
Connect；
The negative pole of the power supply also passes sequentially through the 6th diode simultaneously, the 4th resistance is connected with grounding electrode；Described
Positive pole one end of six diodes and the negative pole of power supply connect, and negative pole one end of the 6th diode passes through the 4th resistance and grounding electrode
Connection；
The positive pole of 7th diode is connected with the 4th resistance, and negative pole connects with the probe.
As a further improvement on the present invention, the loop detection module also includes the second triode, the 5th LED, the
Five resistance, the 7th resistance, the first voltage-regulator diode, the 8th diode, the second voltage-regulator diode and the 8th resistance；
The emitter-base bandgap grading of second triode connects with probe, and the colelctor electrode of the second triode passes through the 5th LED, the 5th electricity
Resistance is connected with grounding electrode；The base stage of second triode passes sequentially through the 7th resistance, the first voltage-regulator diode, the eight or two pole
Pipe and the second voltage-regulator diode are connected with grounding electrode；
One end of 8th resistance is connected with the probe, and the other end is connected with first voltage-regulator diode.
As a further improvement on the present invention, the loop detection module also includes the first diode, the second diode, the
Three diodes, the 4th diode, the 5th diode, rectifier bridge, the 3rd LED and 3rd resistor；
Negative pole and just in first diode, the second diode, the 3rd diode, the 4th diode and the 5th diode
Pole is sequentially connected, wherein, the positive pole positive pole with power supply and the probe connection simultaneously of first diode；5th diode
Negative pole be connected by the 4th resistance with grounding electrode；
The rectifier bridge has two exchange ends and two DC terminals；In described two exchange ends, one end and the 5th diode
Negative pole connection, the other end is grounded by 3rd resistor；In described two DC terminals, output one end by the 3rd LED with it is defeated
Enter end connection.
As a further improvement on the present invention, the loop detection module also includes accompanying voltage rectifier；It is described to accompany repoussage
Current circuit includes the tenth resistance, the 6th LED, the first electric capacity, the 11st resistance and the 3rd voltage-regulator diode；
The probe passes sequentially through the tenth resistance, the 6th LED, the first electric capacity, the 11st resistance and is connected with grounding electrode；
The positive pole and the first capacitance connection of 3rd voltage-regulator diode, negative pole connect with probe.
In summary, the present invention can carry out the detection of multiple functions, including whether loop turns on, electricity by testing needle
Press measurement of grade and positive pulse and negative pulse voltage etc..It is easy to use, without being shifted gears.Test electroprobe uses
It is convenient, judge it is fast, can interpolate that in tested pilot in circuit either with or without open circuit loop or there is voltage, short circuit, positive pulse, bear
The state that pulse or dolly battery are electrically charged.And the battery in itself handwriting can be full of in test is carried out.
In order to more fully understand and implement, the invention will now be described in detail with reference to the accompanying drawings.
Brief description of the drawings
Fig. 1 is the structural representation of the voltage test pencil of prior art one.
Fig. 2 is the structural representation of the detection means of prior art two.
Fig. 3 is the structural representation of the voltage test pencil of the present invention.
Fig. 4 is the circuit diagram of the test circuit of the present invention.
Embodiment
In order to solve in the prior art when carrying out a variety of tests, it is necessary to carry out gear shift operation, user is not made operationally not
Just technological deficiency, the invention provides a kind of voltage test pencil easy to operate, and the test circuit inside the voltage test pencil.Below
It is introduced by specific embodiment.
The invention provides a kind of voltage test pencil, and it includes handwriting 1, testing needle 2, luminous tube 3, electric wire 4 and crocodile clip 5.Institute
One end that testing needle 2 is arranged on handwriting 1 is stated, the luminous tube 3 is arranged in the other end of handwriting.The crocodile clip 5 passes through electricity
Line 4 is connected with handwriting 1.The inside of handwriting 1 is provided with detection circuit.Test pen in the present invention is simple in construction, passes through testing needle
It can be carried out the detection of load.And when being detected for load, mainly realized by the detection circuit of inside.It is right below
The principle of the detection circuit of the present invention describes in detail.
Please refer to Fig. 4, it is the circuit diagram for detecting circuit of the invention.The detection circuit includes power supply, ground connection
Electrode B, probe A and loop detection module.The loop detection module includes：First resistor R1, second resistance R2, the 4th resistance
R4, the second LED, the 6th diode D6 and the 7th diode D7；
The positive pole of the power supply with probe A by being connected.
The negative pole of the power supply passes sequentially through second resistance R2, the second LED, the 4th resistance R4 and is connected with grounding electrode；
Positive pole one end of second LED and the negative pole of power supply connect, and second LED negative pole one end passes through the 4th resistance R4 and ground connection
Electrode connects.
The negative pole of the power supply also passes sequentially through the 6th diode D6 simultaneously, the 4th resistance R4 is connected with grounding electrode；Institute
State the 6th diode D6 positive pole one end and the negative pole of power supply connects, the 6th diode D6 negative pole one end passes through the 4th resistance R4
It is connected with grounding electrode.
The positive pole of the 7th diode D7 is connected with the 4th resistance R4, and negative pole is connected with the probe A.
The circuit of the present invention can be made whether the test in loop.When the access external world there is not electric loading, pass through power supply
Positive pole, probe A, load, the 4th resistance R4 and the second LED, form loop.By whether lighting the second LED judges loop
Whether turn on.Meanwhile test circuit of the invention can be also used for carrying out the positive pulse test in loop.Test is in normal circuit
In when having loading band positive pulse, then the 2nd LED can be often lighted in test circuit.
As the preferred embodiment of the present embodiment, the loop detection module also includes the first diode D1, the second diode
D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, rectifier bridge MB6S, the 3rd LED and 3rd resistor R3.
The first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 and the 5th diode D5
Middle negative pole and positive pole are sequentially connected.Wherein, the positive pole of the first diode D1 is connected with the positive pole and probe A of power supply simultaneously.
The negative pole of the 5th diode D5 is connected by the 4th resistance R4 with grounding electrode B.
The rectifier bridge MB6S has two exchange ends and two DC terminals.In described two exchange ends, one end and the five or two
Pole pipe D5 negative pole connection, the other end are grounded by 3rd resistor R3；In described two DC terminals, output one end passes through the 3rd
LED is connected with input.
By the improvement of foregoing circuit, when positive pulse voltage is higher than 10V, pulse current flows to its cells.Work as simultaneously
When supply voltage is higher than 2.5V, electric current is by the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode
D4, the 5th diode D5, the 6th diode D6, the 4th resistance R4, and return to grounding electrode B.When the 4th resistance R4 voltage is drawn
Gao Hou, bias current to rectifier bridge, the 3rd LED is lighted, and grounding electrode B is returned to by 3rd resistor.Specifically, in the present embodiment
In, the 3rd LED is blue lamp.
As the further optimal enforcement mode of the present embodiment, the loop detection module also includes the second triode
Q2, the 5th LED, the 5th resistance R5, the 7th resistance R7, the first voltage-regulator diode Z1, the 8th diode D8, the pole of the second voltage stabilizing two
Pipe Z2 and the 8th resistance R8.
The emitter-base bandgap grading of the second triode Q2 is connected with probe A, the second triode Q2 colelctor electrode by the 5th LED,
5th resistance R5 is connected with grounding electrode B；The base stage of the second triode Q2 passes sequentially through the 7th resistance R7, the first voltage stabilizing two
Pole pipe Z1, the 8th diode D8 and the second voltage-regulator diode Z2 are connected with grounding electrode B.
One end of the 8th resistance R8 is connected with the probe A, and the other end is connected with the first voltage-regulator diode Z1.
By the further improvement of above-mentioned detection circuit, when positive pulse or voltage are higher than 13.5V, make the second triode Q2
Conducting, electric current is by the 5th LED, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance
R9, the 8th diode D8, the first voltage-regulator diode Z1, the second voltage-regulator diode Z2, eventually pass back to grounding electrode B.Pass through judgement
Whether the 5th LED is lighted, so as to judge whether the load voltage is more than 13.5V.In the present embodiment, the 5th LED
For red light.In the present embodiment, the 4th LED4, the 5th LED5 are the double-colored hair pipes of a three pin common cathodes, when voltage is higher than
9.5V lights green light, higher than 13.5V when be changed into red, green light puts out Destroy.
As the further optimal enforcement mode of the present embodiment, the loop detection module also includes accompanying voltage rectifier.
It is described to accompany voltage rectifier to include the tenth resistance R10, the 6th LED, the first electric capacity C1, the 11st resistance R11 and the 3rd voltage stabilizing
Diode Z3.
The probe A passes sequentially through the tenth resistance R10, the 6th LED, the first electric capacity C1, the 11st resistance R11 and ground connection
Electrode B connects；The positive pole of the 3rd voltage-regulator diode Z3 is connected with the first electric capacity C1, and negative pole is connected with probe A.
By the further improvement to above-mentioned detection circuit, when each pulse voltage is passed through, the 6th LED can be all lighted
Lamp.Judge whether pulse voltage passes through by the 6th LED.In the present embodiment, the 6th LED is amber light.
The detection method of the voltage test pencil of the present invention is introduced in detail below：
For the present invention in each test point engaged test, several luminous tubes of a tail are all lighted wherein at least can a hair
Light pipe is normal, and short circuit, loop or the presence for having various voltages and positive negative pulse stuffing are had in the circuit in being tested.The present invention
The circuit of detection includes following several situations：
1st, there is the test in loop
Test have in normal circuit load out of power test point after, then test electroprobe self by power supply just
Pole, probe A, load, the 4th resistance R4 and the second LED, form loop.By whether lighting the second LED judges that loop is
No conducting.
2nd, the positive pulse for having loop is tested
Meanwhile test circuit of the invention can be also used for carrying out the positive pulse test in loop.Test is in normal circuit
In when having loading band positive pulse, then the 2nd LED can be often lighted in test circuit.
When positive pulse voltage is higher than 9.5V, pulse current flows to its cells.Simultaneously when supply voltage is higher than 2.5V,
Electric current is by the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, the 6th
Diode D6, the 4th resistance R4, and return to grounding electrode B.After the 4th resistance R4 voltage high, bias current to rectifier bridge, point
Bright 3rd LED, and grounding electrode B is returned to by 3rd resistor.
3rd, voltage tester
(1) when voltage is higher than 6V, electric current from probe A, first resistor R1, the first LED, the 4th resistance R4 to its cells,
Charged simultaneously.Simultaneously when supply voltage is higher than 2.5V, electric current is by the first diode D1, the second diode D2, the 3rd
Diode D3, the 4th diode D4, the 5th diode D5, the diode D6 of composition bias current voltage stabilizing the 6th, the 4th resistance R4, and return
To grounding electrode B.After the 4th resistance R4 voltage high, bias current to rectifier bridge, the 3rd LED is lighted, and pass through the 3rd electricity
Resistance returns to grounding electrode B.
(2) when positive pulse or voltage are higher than 9.5V, pulse current flows to its cells.Simultaneously when supply voltage is higher than
During 2.5V, electric current is by the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode
D5, composition bias current voltage stabilizing, then pass through the 6th diode D6, the 4th resistance R4, and return to grounding electrode B again.When the 4th resistance
After R4 voltage high, bias current to rectifier bridge, the 3rd LED is lighted, and grounding electrode B is returned to by 3rd resistor.
(3) when the battery in dolly is that 12V, voltage be higher than 13.5V, turn on the second triode Q2, electric current is by the 5th
LED, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the 8th diode D8,
One voltage-regulator diode Z1, the second voltage-regulator diode Z2, eventually pass back to grounding electrode B.By judging whether the 5th LED is lighted,
So as to judge whether the load voltage is more than 13.5V.After dolly starts, voltage is charged state higher than 13.5V so batteries,
In the present embodiment, the 5th LED is red light.
4th, there is voltage negative pulses test
Test have in normal circuit load out of power test point after, then test electroprobe self by power supply just
Pole, probe A, load, the 4th resistance R4 and the second LED, form loop.By whether lighting the second LED judges that loop is
No conducting.Meanwhile each negative pulse lights the 6th LED.
5th, there is the test of the carrier pulse in voltage
After the 3rd LED3, the 4th LED4, luminous tube are lighted on the basis of different voltage, each pulse is lighted one time
Six LED.
Compared to prior art, the present invention can carry out the detection of multiple functions, including whether loop leads by testing needle
Measurement of logical, voltage class and positive pulse and negative pulse voltage etc..It is easy to use, without being shifted gears.Electroprobe is tested to use
It is convenient to get up, judge it is fast, can interpolate that in tested pilot in circuit either with or without open circuit loop or there is voltage, short-circuit, positive arteries and veins
The state that punching, negative pulse or dolly battery are electrically charged.And the battery in itself handwriting can be full of in test is carried out.
The invention is not limited in above-mentioned embodiment, if the various changes or deformation to the present invention do not depart from the present invention
Spirit and scope, if these changes and deformation belong within the scope of the claim and equivalent technologies of the present invention, then this hair
It is bright to be also intended to comprising these changes and deformation.
Claims (6)
- A kind of 1. detection circuit of Multifunction screw-driver with voltage tester, it is characterised in that：Detected including power supply, grounding electrode, probe and loop Module；The loop detection module includes：First resistor, second resistance, the 4th resistance, the second LED, the 6th diode and Seven diodes；The positive pole of the power supply with probe by connecting；The negative pole of the power supply passes sequentially through second resistance, the second LED, the 4th resistance and is connected with grounding electrode；Described second Negative pole one end of LED and the negative pole of power supply are connected, and second LED positive pole one end is connected by the 4th resistance with grounding electrode；The negative pole of the power supply also passes sequentially through the 6th diode simultaneously, the 4th resistance is connected with grounding electrode；Described 6th 2 Positive pole one end of pole pipe and the negative pole of power supply are connected, and negative pole one end of the 6th diode is connected by the 4th resistance and grounding electrode Connect；The positive pole of 7th diode is connected with the 4th resistance, and negative pole connects with the probe；The loop detection module also includes the second triode, the 5th LED, the 5th resistance, the 7th resistance, the pole of the first voltage stabilizing two Pipe, the 8th diode, the second voltage-regulator diode and the 8th resistance；The emitter-base bandgap grading of second triode connects with probe, the colelctor electrode of the second triode by the 5th LED, the 5th resistance with Grounding electrode connects；The base stage of second triode pass sequentially through the 7th resistance, the first voltage-regulator diode, the 8th diode and Second voltage-regulator diode is connected with grounding electrode；One end of 8th resistance is connected with the probe, and the other end is connected with first voltage-regulator diode.
- 2. the detection circuit of Multifunction screw-driver with voltage tester according to claim 1, it is characterised in that：The loop detection module is also wrapped Include the first diode, the second diode, the 3rd diode, the 4th diode, the 5th diode, rectifier bridge, the 3rd LED and Three resistance；In first diode, the second diode, the 3rd diode, the 4th diode and the 5th diode negative pole and positive pole according to Secondary connection, wherein, the positive pole positive pole with power supply and the probe connection simultaneously of first diode；5th diode is born Pole is connected by the 4th resistance with grounding electrode；The rectifier bridge has two exchange ends and two DC terminals；In described two exchange ends, one end is negative with the 5th diode Pole is connected, and the other end is grounded by 3rd resistor；In described two DC terminals, output one end passes through the 3rd LED and input Connection.
- 3. the detection circuit of Multifunction screw-driver with voltage tester according to claim 2, it is characterised in that：The loop detection module is also wrapped Include and accompany voltage rectifier；It is described to accompany voltage rectifier to include the tenth resistance, the 6th LED, the first electric capacity, the 11st resistance and the Three voltage-regulator diodes；The probe passes sequentially through the tenth resistance, the 6th LED, the first electric capacity, the 11st resistance and is connected with grounding electrode；It is described The positive pole and the first capacitance connection of 3rd voltage-regulator diode, negative pole connect with probe.
- A kind of 4. Multifunction screw-driver with voltage tester, it is characterised in that：Including handwriting, testing needle, luminous tube, electric wire and crocodile clip；The survey Test point is arranged on one end of handwriting, and the luminous tube is arranged in the other end of handwriting；The crocodile clip passes through electric wire and handwriting Connection；Detection circuit is provided with inside the handwriting；The detection circuit includes power supply, grounding electrode, probe and loop detection module；The loop detection module includes：The One resistance, second resistance, the 4th resistance, the second LED, the 6th diode and the 7th diode；The positive pole of the power supply with probe by connecting；The negative pole of the power supply passes sequentially through second resistance, the second LED, the 4th resistance and is connected with grounding electrode；Described second Negative pole one end of LED and the negative pole of power supply are connected, and second LED positive pole one end is connected by the 4th resistance with grounding electrode；The negative pole of the power supply also passes sequentially through the 6th diode simultaneously, the 4th resistance is connected with grounding electrode；Described 6th 2 Positive pole one end of pole pipe and the negative pole of power supply are connected, and negative pole one end of the 6th diode is connected by the 4th resistance and grounding electrode Connect；The positive pole of 7th diode is connected with the 4th resistance, and negative pole connects with the probe；The loop detection module also includes the second triode, the 5th LED, the 5th resistance, the 7th resistance, the pole of the first voltage stabilizing two Pipe, the 8th diode, the second voltage-regulator diode and the 8th resistance；The emitter-base bandgap grading of second triode connects with probe, the colelctor electrode of the second triode by the 5th LED, the 5th resistance with Grounding electrode connects；The base stage of second triode pass sequentially through the 7th resistance, the first voltage-regulator diode, the 8th diode and Second voltage-regulator diode is connected with grounding electrode；One end of 8th resistance is connected with the probe, and the other end is connected with first voltage-regulator diode.
- 5. Multifunction screw-driver with voltage tester according to claim 4, it is characterised in that：The loop detection module also includes the one or two pole Pipe, the second diode, the 3rd diode, the 4th diode, the 5th diode, rectifier bridge, the 3rd LED and 3rd resistor；In first diode, the second diode, the 3rd diode, the 4th diode and the 5th diode negative pole and positive pole according to Secondary connection, wherein, the positive pole positive pole with power supply and the probe connection simultaneously of first diode；5th diode is born Pole is connected by the 4th resistance with grounding electrode；The rectifier bridge has two exchange ends and two DC terminals；In described two exchange ends, one end is negative with the 5th diode Pole is connected, and the other end is grounded by 3rd resistor；In described two DC terminals, output one end passes through the 3rd LED and input Connection.
- 6. Multifunction screw-driver with voltage tester according to claim 5, it is characterised in that：The loop detection module also includes accompanying repoussage stream Circuit；It is described to accompany voltage rectifier to include the tenth resistance, the 6th LED, the first electric capacity, the 11st resistance and the pole of the 3rd voltage stabilizing two Pipe；The probe passes sequentially through the tenth resistance, the 6th LED, the first electric capacity, the 11st resistance and is connected with grounding electrode；It is described The positive pole and the first capacitance connection of 3rd voltage-regulator diode, negative pole connect with probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610675198.2A CN107765070A (en) | 2016-08-16 | 2016-08-16 | A kind of Multifunction screw-driver with voltage tester and its test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610675198.2A CN107765070A (en) | 2016-08-16 | 2016-08-16 | A kind of Multifunction screw-driver with voltage tester and its test circuit |
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| CN107765070A true CN107765070A (en) | 2018-03-06 |
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| CN201610675198.2A Pending CN107765070A (en) | 2016-08-16 | 2016-08-16 | A kind of Multifunction screw-driver with voltage tester and its test circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030916A (en) * | 2018-05-28 | 2018-12-18 | 国家电网公司 | Multifunction test pencil and cable measurement method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030916A (en) * | 2018-05-28 | 2018-12-18 | 国家电网公司 | Multifunction test pencil and cable measurement method |
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Application publication date: 20180306 |