CN203299263U - Electroscope pen of direct or alternate currents - Google Patents
Electroscope pen of direct or alternate currents Download PDFInfo
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- CN203299263U CN203299263U CN2013203123945U CN201320312394U CN203299263U CN 203299263 U CN203299263 U CN 203299263U CN 2013203123945 U CN2013203123945 U CN 2013203123945U CN 201320312394 U CN201320312394 U CN 201320312394U CN 203299263 U CN203299263 U CN 203299263U
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Abstract
Disclosed is an electroscope pen of direct or alternate currents. The pen comprises an insulation housing, a test contact, a hand-touch electrode, a voltage sampling loop, a voltage comparison loop, an output display loop and a power supply. When a positive potential is tested by the electroscope pen, a red LED1 is lighted; when a negative potential is tested, a green LED2 is lighted; and when an alternate current is tested, the two diodes are both lighted. The pen is high in sensitivity with a voltage detection scope ranging from 10 V to 250 V, convenient to carry, small in size, low in cost, little in power consumption, wide in applicability, and simple in production technology.
Description
Technical field
The utility model 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 the work such as defect processing, signal transmission, need often to measure the current potential of each node in 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 coordinate but do like this, under the environment of insufficient light, very difficult, work efficiency is not high, during particularly for numerous signal node, more sense inconvenience.And conventional alternating current pen can only be distinguished live wire and the zero line of alternating current.Chinese patent CN2709990Y: DC electrical special test pencil, its shortcoming is: design too simple, directly light emitting diode is connected between measured point and ground, owing to driving light emitting diode, the working current of 5～10mA must be arranged, 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 ground, with the current potential of measured point, drive neon lamp, violate the cardinal rule of input end and output terminal isolation, jeopardized personal safety.CN2226309Y: AC-DC polarity test pencil, its shortcoming is: because judgement shows that triode input end used is connected serially to measured point, the size of current of input end be subjected to input resistance R, insulation against ground resistance R+, R-'s and human body resistance impact, the sensitivity meeting is affected, moreover measured point is had larger shunting.CN2259631Y: the electronic induction electroscope, be the electroscope of induction alternating current, due to direct current without alternating electromagnetic field, so can't measure direct current.CN2132994Y: Multi-functional test pencil, 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.
The utility model content
The purpose of this utility model 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, and reaches the alternating current-direct current electroscope of alternating current fire wire, zero line.
For achieving the above object, the technical solution adopted in the utility model 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 display loop and power supply, it is characterized in that: voltage sample loop (1) is comprised 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 the voltage comparator of being connected (U1) with sample resistance (R2), and the other end of sample resistance (R2) is connected with hand touched electrode (B), voltage comparison loop (2) consists 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 4 with hand touched electrode (B) with power supply with the 2IN-pin) negative pole is connected, the VS+ pin is connected with positive source, the LED1 current-limiting resistance (R3) that output display loop (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 forms, 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).
Turn on-switch during measurement, hand contact hand touched electrode, when test contact was touched electric position, the pressure drop on sample resistance (R2) was that voltage comparator 1IN-pin, 2IN+ pin and 1IN+ pin, 2IN-pin input voltage are poor, 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 lit, 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 lit.
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., due to the persistence of vision effect, seem that two light emitting diodes are all bright.
The utility model compared with prior art has the following advantages:
1, the utility model can make up the deficiency of conventional alternating current pen, can test out the positive and negative of DC loop current potential.
2, owing to adopting 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,, just can reliably overturn during greater than 2mV due to 2 input end pressure reduction of voltage comparator, sensitivity is high,, so it is very wide to detect voltage range, reaches 10～250V.
4, easy to carry, one multiplex.
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 utility model.
Accompanying drawing 2 is embodiment schematic diagram of the present utility model.
The icon explanation:
1. voltage sample loop; 2. voltage comparison loop; 3. output display loop; 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 utility model, and accompanying drawing 2 is embodiment schematic diagram of the present utility model, the 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 forms, insulation crust is equipped with the voltage sample loop in (5), the voltage comparison loop, output display loop and battery, voltage sample loop (1) is comprised 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 the voltage comparator of being connected (U1) with sample resistance (R2), the other end of sample resistance (R2) is connected with hand touched electrode (B), voltage comparison loop (2) consists 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 4 with hand touched electrode (B) with power supply with the 2IN-pin) negative pole is connected, the VS+ pin is connected with positive source, the LED1 current-limiting resistance (R3) that output display loop (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 forms, 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 used time does not disconnect, and saves battery.When electroscope was tested positive potential, red light emitting diodes (LED1) was lit, and green LED (LED2) keeps extinguishing.When electroscope was tested negative potential, red light emitting diodes (LED1) kept extinguishing, and green LED (LED2) is lit.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 the present embodiment, can make other shapes; Described in the utility model 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 display loop and power supply, it is characterized in that: voltage sample loop (1) is comprised 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 the voltage comparator of being connected (U1) with sample resistance (R2), and the other end of sample resistance (R2) is connected with hand touched electrode (B), voltage comparison loop (2) consists 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 4 with hand touched electrode (B) with power supply with the 2IN-pin) negative pole is connected, the VS+ pin is connected with positive source, the LED1 current-limiting resistance (R3) that output display loop (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 forms, 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 |
|---|---|---|---|
| CN2013203123945U CN203299263U (en) | 2013-05-22 | 2013-05-22 | Electroscope pen of direct or alternate currents |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203123945U CN203299263U (en) | 2013-05-22 | 2013-05-22 | Electroscope pen of direct or alternate currents |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203299263U true CN203299263U (en) | 2013-11-20 |
Family
ID=49575268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203123945U Expired - Lifetime CN203299263U (en) | 2013-05-22 | 2013-05-22 | Electroscope pen of direct or alternate currents |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203299263U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336167A (en) * | 2013-05-22 | 2013-10-02 | 国家电网公司 | AC-DC test pen |
-
2013
- 2013-05-22 CN CN2013203123945U patent/CN203299263U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103336167A (en) * | 2013-05-22 | 2013-10-02 | 国家电网公司 | AC-DC test pen |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131120 |