CN2050172U - Test pencil distinguishing alternating current and direct current low potential - Google Patents
Test pencil distinguishing alternating current and direct current low potential Download PDFInfo
- Publication number
- CN2050172U CN2050172U CN 89203290 CN89203290U CN2050172U CN 2050172 U CN2050172 U CN 2050172U CN 89203290 CN89203290 CN 89203290 CN 89203290 U CN89203290 U CN 89203290U CN 2050172 U CN2050172 U CN 2050172U
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- China
- Prior art keywords
- test pencil
- current
- direct current
- low potential
- light emitting
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Abstract
The utility model discloses a test pencil device which can recognize the low potential of alternating and direct current of 1-60V. The test pencil device which can recognize the low potential of alternating and direct current of 1-60V is also suitable for testing electric voltage of 60-380V. The test pencil device which can recognize the low potential of alternating and direct current of 1-60V is that a switch circuit which is composed of two crystal triodes is connected between the current-limiting resistor of the existing test pencil and a hand touched electrode in series. The test pencil device which can recognize the low potential of alternating and direct current of 1-60V is composed of a display circuit which is composed of a crystal light emitting diode, the current-limiting resistor of a light emitting diode, and a power supply. The disturbance of an induced electromotive force is removed in order to ensure the normal work of an entire machine. An anti-interference circuit which is composed of a capacitor and a shunt resistor is connected between the base pole of a first triode and the emitting pole of a second triode.
Description
The utility model relates to a kind of improved electrical test pencil device, and the particularly a kind of test pencil that can discern 1～60V alternating current-direct current electronegative potential also is suitable for testing the combined-voltage of 60～380V.
Existing test pencil mainly is composed in series by test contact, metal spring, current-limiting resistance, neon tube and hand touched electrode.The test pencil of selling on the market is exactly this form.When test contact contacts with tested metallic object, whether when anthropolith contacts with the hand touched electrode, it is charged just to test metallic object, and when there was high voltage in metallic object relative to the earth, the neon tube starter in the test pencil indicated tested metallic object charged.But this test pencil can only be tested the voltage of 60～380V, and 1～60V alternating current-direct current Di Dian Ya And can not make the neon tube starter in the test pencil, so this test pencil can not be discerned the alternating current-direct current electronegative potential of 1～60V.In fields such as electronics, traffic, national defence, there is a large amount of alternating current-direct current relay loop in the electric equipment, pick up and survey these loops, during particularly with the relay loop of light current, often by means of universal electric meter, whether universal electric meter can indicate relay loop unobstructed not to the utmost, and energy measurement resistance, voltage and current value, can draw quantitative results.But the universal electric meter volume is bigger, and price is more expensive, and certain technical requirement is arranged during use, and improper use causes the universal electric meter damage easily.Whether work as in picking up the survey process only needs identification circuit unimpeded, the occasion of having only qualitative requirement, it is not very desirable using universal electric meter, outstanding sense inconvenience when particularly picking up test cross direct current (light current) relay loop on the big transport facility of flowability (as: automobile, electric car, aircraft, naval vessel).
The purpose of this utility model will provide a kind of improved electrical test pencil exactly, to enlarge the test specification of traditional electrical test pencil, be suitable for testing the combined-voltage of 1～380V, do not use universal electric meter to use the alternating current-direct current electronegative potential that this test pencil just can be discerned 1～60V easily instead.
The utility model is finished as follows, is connected with the on-off circuit of being made up of two transistors (specification is 3DG6, and minimum operating voltage is 1V) between the current-limiting resistance of existing test pencil and hand touched electrode; The display circuit of forming by crystallo-luminescence diode, light emitting diode current-limiting resistance (resistance is 220～330 Ω) and power supply; Working properly in order to guarantee complete machine, remove the interference of induction electromotive force, between the emitter of the basis set of first triode and second triode, also connect an electric capacity (span be 0.01～0.047Vf) and shunt resistance (resistance is 56～82K) anti-jamming circuit.
Described light emitting diode is the gallium arsenide luminotron.
Described power supply is a battery.
When needs identification alternating current-direct current current potential, as long as test contact is contacted with tested metallic object, anthropolith contacts with the hand touched electrode, when if tested metallic object has the effective voltage of 1～380V, after voltage signal is imported the current-limiting resistance current limliting by the metallic test contact, constitute the loop by on-off circuit, display circuit, hand touched electrode and anthropolith, the light emitting diode starter, represent that tested metallic object is charged, both can discern the alternating current-direct current electronegative potential of 1-60V, also can test the voltage of 60～380V.When if tested metallic object only has induced voltage, then induced voltage signal after tested contact, current-limiting resistance, electric capacity, shunt resistance, hand touched electrode and human body flow away, light emitting diode can starter, thereby guarantees the operate as normal of test pencil device.If tested golden body is not charged or voltage is lower than 1V, also starter not of light emitting diode then.
The utility model carries, easy to use, dependable performance is picked up and is surveyed the efficient height, has improved electrician's working condition.
Below with reference to accompanying drawing the utility model is described in further detail.
Fig. 1 is a basic circuit diagram of the present utility model.
Fig. 2 is the longitudinal sectional drawing of a kind of concrete structure of the utility model.
Fig. 3 is the cut-open view of Fig. 2 test pencil device along 1～1 line.
Fig. 4 is a printed circuit board (PCB) and contact copper sheet combination synoptic diagram.Fig. 5 is the axonometric drawing of engaging nail.
With reference to accompanying drawing 1～5, the test contact 1 with excellent conductive performance is moulded casting in insulation crust 2, and test contact 1 is made the inverted cone needlepoint form here, the accuracy when contacting the measured point to improve test contact.Shell 2 can be that transparent plastic is done or have a transparent window, in order to observe whether starter of light emitting diode 8.One cylindrical cavity is arranged in the shell 2, and an end 3 of close test contact 1 stretches into cavity from conical top, contacts with a turriform spring 4.In a kind of concrete structure of the present utility model shown in Figure 2, current-limiting resistance 5, transistor 6, the 7(specification is 3DG6, minimum operating voltage is 1V), gallium arsenide light emitting diode 8, light emitting diode current-limiting resistance 9(resistance is 220～330 Ω), electric capacity 10(span is 0.01Vf～0.047Vf), shunt resistance 11(resistance is 56K～82K) all be combined in the printed circuit board (PCB) shown in Figure 4 12, and printed circuit board (PCB) 12 is connected with round copper contact chip 14 near an end of luminotron current-limiting resistances 9, printed circuit board (PCB) 12 is connected with round copper contact chip 13 near an end of current-limiting resistance 5, printed circuit board (PCB) 12 is connected with contact copper sheet 16 near a side of triode 7 emitters.One end of circle copper contact chip 13 and an end in contact of turriform spring 4, the other end of circle copper contact chip 13 with link to each other with current-limiting resistance 5.One end of circle copper contact chip 14 links to each other with resistance flowing resistance 9, and the other end of circle copper contact chip 14 and the anode of power supply 15 join.The diameter of circle copper sheet 13 is slightly less than the diameter of round copper sheet 14, is as the criterion so that printed circuit board (PCB) 12 can be put into the inner chamber in cross section shown in Figure 3.5～6
#The negative electrode of dry battery power 15 is connected with cylindrical spring 17.Turriform spring 4 can be by 0.3 millimeter zinc-plated twine coiled, and cylindrical spring 17 can be by 0.5 millimeter zinc-plated twine coiled.Link to each other with lead 20 between contact copper sheet 16 and the hand touched electrode 18, an end of lead 20 is connected with copper engaging nail 21.(structure is seen Fig. 5), block the outside surface of contact copper sheet 16 in order to elasticity, to form good electrical contact, the other end of lead 20 links to each other with cylindrical shape copper contact 19 outer walls, and lead 20, copper engaging nail 21, cylindrical shape copper contact 19 are moulded cast solid with plastic casing 2.Hand touched electrode 18 peripheries have the female thread of pin thread and shell 2 end cylindrical shape contact 19 inwalls.Put into turriform spring 4, the printed circuit board (PCB) 12 of being with the contact copper sheet, dry battery power 15, cylindrical spring 17 in proper order, contact with cylindrical spring 17 in cylindrical shape contact 19 screw-in hand touched electrode 18 again at the inner chamber of test pencil device, because the elastic pressure of two springs makes test pencil device be electrically connected from forming reliably between test contact 1, printed circuit board (PCB) 12 dry battery powers 15 touched electrode 18 in one's hands.
During operation, for example need to pick up test cross direct current (light current) relay loop when whether unobstructed, as long as test contact 1 is contacted with the measured point, the part of staff contacts with hand touched electrode 18, if light emitting diode 8 starters, show that continuous electric loop is unimpeded,, represent that then relay loop is obstructed if light emitting diode 8 extinguishes.
Claims (3)
1, a kind of test pencil device of discerning the alternating current-direct current electronegative potential has:
(1) plastic casing 2;
(2) test contact 1;
(3) current-limiting resistance 5;
(4) the hand touched electrode 18;
It is characterized in that being connected with between current-limiting resistance 5 and the hand touched electrode 18
(5) transistor 6,7, its
(5.1) specification is 3DG6, and minimum operating voltage is 1V;
(6) light emitting diode 8;
(7) the light emitting diode current-limiting resistance 9, its
(7.1) resistance is 220～330 Ω; And
(8) power supply 15;
Between the emitter of the basis set of transistor 6 and transistor 7, be connected with
(9) electric capacity 10, its
(9.1) span is 0.01Vf～0.047Vf; With
(10) shunt resistance 11, its
(10.1) resistance is 56～82K.
2, by the described test pencil device of claim 1, it is characterized in that described light emitting diode 8 is gallium arsenide luminotrons.
3,, it is characterized in that described power supply 15 is battery by claim 1 or 2 described test pencil devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89203290 CN2050172U (en) | 1989-03-21 | 1989-03-21 | Test pencil distinguishing alternating current and direct current low potential |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89203290 CN2050172U (en) | 1989-03-21 | 1989-03-21 | Test pencil distinguishing alternating current and direct current low potential |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2050172U true CN2050172U (en) | 1989-12-27 |
Family
ID=4860869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89203290 Withdrawn CN2050172U (en) | 1989-03-21 | 1989-03-21 | Test pencil distinguishing alternating current and direct current low potential |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2050172U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014032395A1 (en) * | 2012-08-27 | 2014-03-06 | 北京四方继保自动化股份有限公司 | Anti-interference switching value transmission circuit |
| CN111537782A (en) * | 2020-05-18 | 2020-08-14 | 广东电网有限责任公司东莞供电局 | Electroscope |
-
1989
- 1989-03-21 CN CN 89203290 patent/CN2050172U/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014032395A1 (en) * | 2012-08-27 | 2014-03-06 | 北京四方继保自动化股份有限公司 | Anti-interference switching value transmission circuit |
| GB2517368A (en) * | 2012-08-27 | 2015-02-18 | Beijing Sifang Automation Co | Anti-interference switching value transmission circuit |
| US9679726B2 (en) | 2012-08-27 | 2017-06-13 | Beijing Sifang Automation Co., Ltd | Anti-interference switch signal transmission circuit |
| GB2517368B (en) * | 2012-08-27 | 2020-06-17 | Beijing Sifang Automation Co | Anti-interference switch signal transmission circuit |
| CN111537782A (en) * | 2020-05-18 | 2020-08-14 | 广东电网有限责任公司东莞供电局 | Electroscope |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |