CN203786239U - Power line electrical on-off testing device - Google Patents
Power line electrical on-off testing device Download PDFInfo
- Publication number
- CN203786239U CN203786239U CN201420153284.3U CN201420153284U CN203786239U CN 203786239 U CN203786239 U CN 203786239U CN 201420153284 U CN201420153284 U CN 201420153284U CN 203786239 U CN203786239 U CN 203786239U
- Authority
- CN
- China
- Prior art keywords
- power lead
- operational amplifier
- circuit
- time base
- output end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 24
- 239000003990 capacitor Substances 0.000 abstract 3
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Testing Of Individual Semiconductor Devices (AREA)
Abstract
The utility model relates to a power line electrical on-off testing device, which comprises two operational amplifiers; the non-inverting input end of the first operational amplifier is respectively connected with a resistor and a first capacitor; the three components form a signal generator; a current limiting resistor and two voltage stabilizing tubes are connected between the inverting input end and the output end of the operational amplifier; the non-inverting input end of the second operational amplifier is connected in series with an adjustable resistor and a second capacitor; the power line to be tested is connected between the adjustable resistor and the current limiting resistor; the tested power line and the second capacitor form a proportional voltage division circuit; the output end of the second operational amplifier is connected with a rectifying circuit, and the output end of the rectifying circuit is connected with a voltmeter; the output end of the voltmeter is connected with a time base circuit; the output end of the time base circuit is connected with the two light emitting diodes. The utility model discloses a there is the rationale of electric capacity between two parallel wires, only need test power cord plug just can test out the power cord break-make condition, and is convenient fast.
Description
Technical field
The utility model relates to a kind of proving installation, especially a kind of device of quick test power lead break-make.
Background technology
Power lead is the electric wire of transmission current, must carry out aborning high-potting, insulation measurement, on off test etc.; Conventionally, when testing power supply line break-make, as to run into one end be the plug other end while being wire, conventionally conductor wire end pressed on copper wire scrubbing brush, measures plug end with multimeter; See whether the information such as voltage that multimeter shows judges break-make; As when running into the other end and being a certain connector, with corresponding connector short circuit it, measure plug end with multimeter, this method of testing speed is slower and very inconvenient.
Summary of the invention
The technical problems to be solved in the utility model is: propose a kind of device that can fast detecting power lead break-make.
The technical scheme that the utility model adopts is: the electric on off test device of a kind of power lead, comprises two operational amplifiers; Wherein the in-phase input end of the first operational amplifier connects respectively a resistance and the first electric capacity; Described three forms a signal generator; Between inverting input and the output terminal of operational amplifier, be connected with current-limiting resistance and two stabilivolts; The in-phase input end of the second described operational amplifier is in series with an adjustable resistance and the second electric capacity; Between described adjustable resistance and current-limiting resistance, be connected tested power lead; Described tested power lead and the second electric capacity form proportion divider circuit; The output terminal of the second described operational amplifier connects rectification circuit, and rectification circuit output end connects voltage table; The output terminal of described voltage table is connected with time base circuit; The output terminal of described time base circuit connects two light emitting diodes.
Further, two stabilivolts described in the utility model are for restricting signal amplitude, and its voltage is 3.0～3.5V.
Because tested power lead often there will be short circuit phenomenon, for anti-voltage table burns, the utility model is provided with a diode between described rectification circuit and voltage table.
Time base circuit described in the utility model is 555 time base circuits.
Two operational amplifiers described in the utility model be no more than ± 15V of supply voltage, its common mode inhibition is higher.
The beneficial effects of the utility model are: adopt the ultimate principle that has electric capacity between two parallel wires, only need testing power supply line plug just can test out power lead break-make situation, and quick and convenient.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
With preferred embodiment, the utility model is described in further detail by reference to the accompanying drawings now.These accompanying drawings are the schematic diagram of simplification, and basic structure of the present utility model is only described in a schematic way, and therefore it only shows the formation relevant with the utility model.
As shown in Figure 1, IC1, IC2 adopt the higher operational amplifier of common mode inhibition all can, be no more than ± 15V of supply voltage, IC1 and R1, C1 form the signal generator of a 10KHz, R2 is current-limiting resistance, and DW1-2 is that the stabilivolt of 2 3.3V is for restricting signal amplitude.
P1, P2 connect with black, the red table rod of multimeter respectively, when test, access power lead between them, and power lead is an electric capacity, and it and C2 form proportion divider circuit, and measured signal is carried out linearity by IC2 and amplified after W1 decay.
IC2 output signal is by D1～D4 full-bridge rectification, and gained direct current signal voltage supplied table is read, because tested power lead often there will be short circuit phenomenon, therefore establish D6 in case voltage table burns.
Because needing a stabilization process, voltage table instruction affects test speed, therefore show fast with IC3 time base circuit NE555 again.NE555 is arranged on 3 pin noble potentials (when red) while test, and while having the setting voltage of exceeding signal, 6 pin trigger upset, make 3 pin become electronegative potential (green light).
Before test, first carry out tester debugging:
Select a good power lead, plug is separately fixed on P1, P2, adjustment is located at the W1 on panel, makes red light just be converted to green light, unclamps P1, P2, green light should become red light about 0.5 second, otherwise, adjust R6 or C4, repeat above-mentioned adjustment process, until time delay 0.5 second, then adjusting W2, to make voltage table reading be 4/5 place (4/5FULL) of full scale.
When test:
Select the shortest (standard minus deviation) good power lead (line-transect), plug is separately fixed to P1, P2 upper, adjust the W1 being located on panel, make red light just be converted to green light.When test, the wire connecting on P1, P2 must not lean on too closely, more must not be wound around.Per hour must correction once with line-transect, in case circuit drift causes error.
If power lead is three utmost point power leads, only need be just passable in two pairs of different inserted sheets tests respectively, the power lead that is connector for the other end, point two ends are tested, by that analogy.
If voltage table pointer reaches maximum range, on tested power lead, there is short circuit; If pointer less than still light yellow of 4/5FULL, red light, in tested power lead, may have open circuit or line too short; In other end test, still like this, certainly on tested power lead, there are open circuit or line too short.
What in above instructions, describe is embodiment of the present utility model, various not illustrating is construed as limiting flesh and blood of the present utility model, person of an ordinary skill in the technical field read after instructions can to before described embodiment make an amendment or be out of shape, and do not deviate from essence of an invention and scope.
Claims (5)
1. the electric on off test device of power lead, is characterized in that: comprise two operational amplifiers; Wherein the in-phase input end of the first operational amplifier connects respectively a resistance and the first electric capacity; Described three forms a signal generator; Between inverting input and the output terminal of operational amplifier, be connected with current-limiting resistance and two stabilivolts;
The in-phase input end of the second described operational amplifier is in series with an adjustable resistance and the second electric capacity; Between described adjustable resistance and current-limiting resistance, be connected tested power lead; Described tested power lead and the second electric capacity form proportion divider circuit;
The output terminal of the second described operational amplifier connects rectification circuit, and rectification circuit output end connects voltage table; The output terminal of described voltage table is connected with time base circuit; The output terminal of described time base circuit connects two light emitting diodes.
2. the electric on off test device of a kind of power lead as claimed in claim 1, is characterized in that: the voltage of two described stabilivolts is 3.0～3.5V.
3. the electric on off test device of a kind of power lead as claimed in claim 1, is characterized in that: between described rectification circuit and voltage table, be provided with a diode.
4. the electric on off test device of a kind of power lead as claimed in claim 1, is characterized in that: described time base circuit is 555 time base circuits.
5. the electric on off test device of a kind of power lead as claimed in claim 1, is characterized in that: two described operational amplifiers be no more than ± 15V of supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420153284.3U CN203786239U (en) | 2014-03-31 | 2014-03-31 | Power line electrical on-off testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420153284.3U CN203786239U (en) | 2014-03-31 | 2014-03-31 | Power line electrical on-off testing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203786239U true CN203786239U (en) | 2014-08-20 |
Family
ID=51322413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420153284.3U Expired - Fee Related CN203786239U (en) | 2014-03-31 | 2014-03-31 | Power line electrical on-off testing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203786239U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869213A (en) * | 2014-03-31 | 2014-06-18 | 常州机电职业技术学院 | Power line electrical on-off testing device |
-
2014
- 2014-03-31 CN CN201420153284.3U patent/CN203786239U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869213A (en) * | 2014-03-31 | 2014-06-18 | 常州机电职业技术学院 | Power line electrical on-off testing device |
| CN103869213B (en) * | 2014-03-31 | 2016-05-04 | 常州机电职业技术学院 | Power line electrical on-off testing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140820 Termination date: 20180331 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |