CN103336167A - AC-DC test pen - Google Patents
AC-DC test pen Download PDFInfo
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- CN103336167A CN103336167A CN2013102145744A CN201310214574A CN103336167A CN 103336167 A CN103336167 A CN 103336167A CN 2013102145744 A CN2013102145744 A CN 2013102145744A CN 201310214574 A CN201310214574 A CN 201310214574A CN 103336167 A CN103336167 A CN 103336167A
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Abstract
The invention relates to an AC(alternating current)-DC(direct current) test pen. The AC-DC test pen comprises an insulation casing, a test contact, a hand touch electrode, a voltage sampling loop, a voltage comparison loop, an output display loop and a power source. When a positive potential is tested by the AC-DC test pen, a red light emitting diode (LED1) is lightened; when a negative potential is tested by the AC-DC test pen, a green light emitting diode (LED2) is lightened; when an alternating current is tested by the AC-DC test pen, two light emitting diodes are lightened. The AC-DC test pen has high sensitivity, has a detection voltage scope of 10-250V, and further has properties of convenient carrying, small size, low manufacturing cost, small power consumption, wide applicability and simple production technology.
Description
Technical field
The present invention relates to a kind ofly can show the positive and negative of transforming plant DC loop current potential, and the alternating current-direct current electroscope of alternating current fire wire, zero line.
Background technology
The relay protection specialty of electric system often will be come into contacts with the DC loop of transformer station, as control loop, signal circuit, open into leaving loop etc.In work such as defect processing, signal transmission, need often to measure the current potential of each node in the associated loop.In real work, the instruments such as band digimer, screwdriver, lighting of need engraving carry out work, measure the current potential of each node with multimeter, need two people to cooperate but do like this, under the environment of insufficient light, very difficult, work efficiency is not high, during particularly at numerous signal node, more sense inconvenience.And conventional interchange electroscope can only be distinguished live wire and the zero line of alternating current.Chinese patent CN2709990Y: direct current working platform electroscope, its shortcoming is: design too simple, directly light emitting diode is connected between measured point and the ground, owing to drive the working current that light emitting diode must have 5～10mA, so it is excessive that resistance R can not be selected, and the too small insulation against ground that jeopardizes personal safety and straight-flow system.CN2684202Y: AC and DC opto-electronic conversion formula low pressure electroscope, its shortcoming is: design too simply, directly neon lamp is connected between measured point and the ground, drive neon lamp with the current potential of measured point, violate the cardinal rule that input end and output terminal are isolated, jeopardized personal safety.CN2226309Y: alternating current-direct current polarity electroscope, its shortcoming is: be connected serially to the measured point owing to judge the used triode input end of demonstration, the size of current of input end be subjected to input resistance R, insulation against ground resistance R+, R-'s and human body resistance influence, the sensitivity meeting is affected, moreover the measured point is had bigger shunting.CN2259631Y: the electronic induction electroscope is the electroscope of induction alternating current, because direct current does not have alternating electromagnetic field, so can't measure direct current.CN2132994Y: multi-functional electroscope, its shortcoming is: can only distinguish electrified body and electrified body not, can not distinguish the positive and negative of transforming plant DC loop electrified body.
Summary of the invention
The objective of the invention is to overcome the problems referred to above, and a kind of the positive and negative of transforming plant DC loop current potential that can show is provided, reach the alternating current-direct current electroscope of alternating current fire wire, zero line.
For achieving the above object, the technical solution used in the present invention is:
A kind of alternating current-direct current electroscope, formed by insulation crust, test contact, hand touched electrode, voltage sample loop, voltage comparison loop, output show circuit and power supply, it is characterized in that: voltage sample loop (1) is made up of divider resistance (R1) and sample resistance (R2), divider resistance (R1) end is connected with test contact (A), the other end is connected with the 1IN-pin of sample resistance (R2) with two voltage comparators (U1), and the other end of sample resistance (R2) is connected with hand touched electrode (B); Voltage comparison loop (2) is made of two voltage comparators (U1), the 1OUT pin of two voltage comparators (U1) connects red light emitting diodes (LED1) the N utmost point, the 2OUT pin connects green LED (LED2) the N utmost point, the 1IN+ pin, the VS-pin is connected with power supply (4) negative pole with hand touched electrode (B) with the 2IN-pin, the VS+ pin is connected with positive source, the LED1 current-limiting resistance (R3) that output show circuit (3) is connected by red light emitting diodes (LED1) the P utmost point, the LED2 current-limiting resistance (R4) that green LED (LED2) the P utmost point connects is formed, LED1 current-limiting resistance (R3), the other end of LED2 current-limiting resistance (R4) is connected with positive source.
As optimization, according to above-described a kind of alternating current-direct current electroscope, it is characterized in that: the electric power loop string has switch (K).
Connect switch during measurement, when hand contact hand touched electrode, test contact were touched electric position, the pressure drop on the sample resistance (R2) was that voltage comparator 1IN-pin, 2IN+ pin and 1IN+ pin, 2IN-pin input voltage are poor, and its principle is as follows:
1, when electroscope is tested positive potential, the 1st voltage comparator 1IN+ pin current potential＜1IN-pin current potential, the 1OUT pin is output as electronegative potential, red light emitting diodes (LED1) is lighted, the 2nd voltage comparator 2IN+ pin current potential＞2IN-pin current potential, the 2OUT pin is output as noble potential, and green LED (LED2) keeps extinguishing.
2, when hand-held electroscope, when negative potential is arrived in test, the 1st voltage comparator 1IN+ pin current potential＞1IN-pin current potential, the 1OUT pin is output as noble potential, red light emitting diodes (LED1) keeps extinguishing, the 2nd voltage comparator 2IN+ pin current potential＜2IN-pin current potential, the 2OUT pin is output as electronegative potential, and green LED (LED2) is lighted.
3, when hand-held electroscope, when alternating current was arrived in test, because 2 voltage comparators are alternately exported electronegative potential, two light emitting diodes were alternately lighted.Because the persistence of vision effect seems that two light emitting diodes are all bright.
The present invention compared with prior art has the following advantages:
1, the present invention can remedy the conventional deficiency that exchanges electroscope, can test out the positive and negative of DC loop current potential.
2, owing to adopt the voltage-type electrical verification, the input resistance of voltage comparator can be considered as infinity, and is very little to the shunting of measured point.
3, because 2 input end pressure reduction of voltage comparator during greater than 2mV, just can reliably overturn, and sensitivity is high, so the detection voltage range is very wide, reach 10～250V.
4, easy to carry, using one more.
5, volume is little, cost is low, power consumption is little, widely applicable, production technology is simple.
Description of drawings
Accompanying drawing 1 is circuit theory diagrams of the present invention.
Accompanying drawing 2 is the embodiments of the invention synoptic diagram.
The icon explanation:
1. voltage sample loop; 2. voltage comparison loop; 3. output show circuit; 4. power supply; R1. divider resistance; R2. sample resistance; A. test contact; B. hand touched electrode; U1. two voltage comparators; LED1. red light emitting diodes; LED2. green LED; The R3.LED1 current-limiting resistance; The R4.LED2 current-limiting resistance; K. switch.
Embodiment
Accompanying drawing 1 is circuit theory diagrams of the present invention, and accompanying drawing 2 is the embodiments of the invention synoptic diagram; Present embodiment alternating current-direct current electroscope, by insulation crust (5) (can make transparent screwdriver handle), test contact (can make screwdriver shape), the hand touched electrode is formed, insulation crust is equipped with the voltage sample loop in (5), the voltage comparison loop, output show circuit and battery, voltage sample loop (1) is made up of divider resistance (R1) and sample resistance (R2), the resistance of current-limiting resistance is far longer than sample resistance, divider resistance (R1) end is connected with test contact (A), the other end is connected with the 1IN-pin of sample resistance (R2) with two voltage comparators (U1), and the other end of sample resistance (R2) is connected with hand touched electrode (B); Voltage comparison loop (2) is made of two voltage comparators (U1), two voltage comparators (U1) adopt LM393 voltage ratio device, the 1OUT pin of two voltage comparators (U1) connects red light emitting diodes (LED1) the N utmost point, the 2OUT pin connects green LED (LED2) the N utmost point, the 1IN+ pin, the VS-pin is connected with power supply (4) negative pole with hand touched electrode (B) with the 2IN-pin, the VS+ pin is connected with positive source, the LED1 current-limiting resistance (R3) that output show circuit (3) is connected by red light emitting diodes (LED1) the P utmost point, the LED2 current-limiting resistance (R4) that green LED (LED2) the P utmost point connects is formed, LED1 current-limiting resistance (R3), the other end of LED2 current-limiting resistance (R4) is connected with positive source; The electric power loop string has switch (K), and the time spent does not disconnect, and saves battery.When electroscope was tested positive potential, red light emitting diodes (LED1) was lighted, and green LED (LED2) keeps extinguishing.When electroscope was tested negative potential, red light emitting diodes (LED1) kept extinguishing, and green LED (LED2) is lighted.When electroscope was tested alternating current, two light emitting diodes were all bright.The shape of this electroscope is not subjected to the restriction of present embodiment, can make other shapes; Of the present invention luminous two and the color of pipe can be random color; Switch (K) can be gone here and there at positive source, also can go here and there at power cathode.
Claims (2)
1. alternating current-direct current electroscope, formed by insulation crust, test contact, hand touched electrode, voltage sample loop, voltage comparison loop, output show circuit and power supply, it is characterized in that: voltage sample loop (1) is made up of divider resistance (R1) and sample resistance (R2), divider resistance (R1) end is connected with test contact (A), the other end is connected with the 1IN-pin of sample resistance (R2) with two voltage comparators (U1), and the other end of sample resistance (R2) is connected with hand touched electrode (B); Voltage comparison loop (2) is made of two voltage comparators (U1), the 1OUT pin of two voltage comparators (U1) connects red light emitting diodes (LED1) the N utmost point, the 2OUT pin connects green LED (LED2) the N utmost point, the 1IN+ pin, the VS-pin is connected with power supply (4) negative pole with hand touched electrode (B) with the 2IN-pin, the VS+ pin is connected with positive source, the LED1 current-limiting resistance (R3) that output show circuit (3) is connected by red light emitting diodes (LED1) the P utmost point, the LED2 current-limiting resistance (R4) that green LED (LED2) the P utmost point connects is formed, LED1 current-limiting resistance (R3), the other end of LED2 current-limiting resistance (R4) is connected with positive source.
2. a kind of alternating current-direct current electroscope according to claim 1, it is characterized in that: the electric power loop string has switch (K).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102145744A CN103336167A (en) | 2013-05-22 | 2013-05-22 | AC-DC test pen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102145744A CN103336167A (en) | 2013-05-22 | 2013-05-22 | AC-DC test pen |
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| Publication Number | Publication Date |
|---|---|
| CN103336167A true CN103336167A (en) | 2013-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102145744A Pending CN103336167A (en) | 2013-05-22 | 2013-05-22 | AC-DC test pen |
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| Country | Link |
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| CN (1) | CN103336167A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137157A (en) * | 2015-09-09 | 2015-12-09 | 国家电网公司 | Alternating- and direct-current high-voltage electricity testing device |
| CN111697355A (en) * | 2020-05-21 | 2020-09-22 | 国网浙江省电力有限公司嘉兴供电公司 | Uninterrupted power ammeter changes device monitoring system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2199541Y (en) * | 1994-05-07 | 1995-05-31 | 高凡 | Inductive test pencil |
| CN2901327Y (en) * | 2006-06-06 | 2007-05-16 | 唐明亮 | Color changing flash test pen |
| CN202815070U (en) * | 2012-08-15 | 2013-03-20 | 成都昊地科技有限责任公司 | Multifunctional LED test pencil |
| CN202993820U (en) * | 2012-12-28 | 2013-06-12 | 济宁市聚海磁业有限公司 | Medium-frequency smelting furnace |
| CN203299263U (en) * | 2013-05-22 | 2013-11-20 | 国家电网公司 | Electroscope pen of direct or alternate currents |
-
2013
- 2013-05-22 CN CN2013102145744A patent/CN103336167A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2199541Y (en) * | 1994-05-07 | 1995-05-31 | 高凡 | Inductive test pencil |
| CN2901327Y (en) * | 2006-06-06 | 2007-05-16 | 唐明亮 | Color changing flash test pen |
| CN202815070U (en) * | 2012-08-15 | 2013-03-20 | 成都昊地科技有限责任公司 | Multifunctional LED test pencil |
| CN202993820U (en) * | 2012-12-28 | 2013-06-12 | 济宁市聚海磁业有限公司 | Medium-frequency smelting furnace |
| CN203299263U (en) * | 2013-05-22 | 2013-11-20 | 国家电网公司 | Electroscope pen of direct or alternate currents |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137157A (en) * | 2015-09-09 | 2015-12-09 | 国家电网公司 | Alternating- and direct-current high-voltage electricity testing device |
| CN111697355A (en) * | 2020-05-21 | 2020-09-22 | 国网浙江省电力有限公司嘉兴供电公司 | Uninterrupted power ammeter changes device monitoring system |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131002 |