CN103941179B - A kind of device used for testing life of key switch - Google Patents
A kind of device used for testing life of key switch Download PDFInfo
- Publication number
- CN103941179B CN103941179B CN201310023070.4A CN201310023070A CN103941179B CN 103941179 B CN103941179 B CN 103941179B CN 201310023070 A CN201310023070 A CN 201310023070A CN 103941179 B CN103941179 B CN 103941179B
- Authority
- CN
- China
- Prior art keywords
- resistance
- relay
- connects
- key switch
- button
- 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
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 230000000994 depressed Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001131 transforming Effects 0.000 description 2
- 229910004682 ON-OFF Inorganic materials 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Abstract
The invention discloses a kind of device used for testing life of key switch, described device include time-delay relay, enumerator, the first relay, the second relay, the 3rd relay, for circulating the button driving module of the button knee-action driving tested key switch and for detecting the key switch break-make detection module of the conducting state of described tested button.The present invention cooperation by key switch break-make detection module, time-delay relay sum counter etc., conducting of short duration to button, button turn on for a long time and do not have to carry out reliable recognition by these several situations of handle to button, thus the break-make of button can be counted and be effectively tested, substantially increase the accuracy of test data, and reduce the labor intensity of laboratory technician.
Description
Technical field
The present invention relates to electronic circuit technology field, in particular it relates to a kind of key switch life test dress
Put.
Background technology
Lamp lighting is seen everywhere inside modern society, and the light fixture used in all trades and professions is the most different,
Purpose is all illumination, improves productivity ratio and workman's production security；But move and make with portable lamp
With when, light fixture Stroke Key Switches can be carried out action, then Stroke Key Switches break-make reliable
Property seem critically important, will consider when Design of Luminaires switch life-span: after Stroke Key Switches is pressed,
Contact conducting, and keep this state, until pressing keys handle the most again, Stroke Key Switches
Disconnecting, the handle of Stroke Key Switches returns to initial position, thus completes a make and break process.
At present when testing the life-span of Stroke Key Switches number of times, the key testing instrument of existing laboratory,
Use one as finger by key head, use circuit control so that it is by key head move up and down, now will
The button needing test is put into below key testing instrument button head, adjust button and instrument by key head it
Between distance, so when key testing instrument frock by key head, when running down to the end, button is opened
Pass presses, and then stops for a moment, when moving upward to top by key head, stops for a moment, transports still further below
Dynamic, just complete for the most upper and lower twice and switch on-off, the most cyclically test just can test out
The life-span of key switch.
But there are three hidden danger here: a hidden danger is, when key switch is damaged, and button
After head is depressed and left, key switch has also returned to topmost (i.e. can not be locked during button conducting) simultaneously,
Owing to laboratory technician can not keep there always, checking that button break-make is the most normal, therefore instrument is still continuing
Continuous test, causes the break-make number of times tested out inaccurate；Second hidden danger is, due to Stroke Key Switches
Be positioned over button instrument by key head below, if key switch displacement, test instrunment will by key head
By less than key switch, test result also can be wrong；3rd hidden danger is that Stroke Key Switches is broken,
Being constantly in conducting state, the handle on button can not return to original position, and button instrument continues to
At counting, thus test data are caused to make a mistake.
Summary of the invention
It is an object of the invention to provide device used for testing life of key switch, it is intended to solve prior art and exist
The of short duration conducting of key switch, key switch turns on for a long time and do not has by can not be accurate during the handle of button
The problem of counting.
In order to realize the purpose of the present invention, described device used for testing life of key switch include time-delay relay,
Enumerator, the first relay, the second relay, the 3rd relay, it is used for circulating the tested button of driving
The button of the button knee-action of switch drives module and for detecting the conducting shape of described tested key switch
The key switch break-make detection module of state；Wherein
One end of described key switch break-make detection module connects power supply, and the other end connects described first relay
The coil of device, one end of the normally opened contact of described first relay connects described power supply, and the other end connects institute
Stating time-delay relay, described time-delay relay also coil with described second relay is connected, and described second
The normally opened contact of relay connects described enumerator, and described enumerator is also connected with described power supply, and the described 3rd
The coil of relay connects described enumerator, and one end of the normally opened contact of described 3rd relay connects described
Power supply, the other end connects described button and drives module.
In above-mentioned device used for testing life of key switch, described key switch break-make detection module includes transformation
Device, rectifier bridge, three terminal regulator, light-emitting diode light, operational amplifier, audion, the first resistance,
Second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance；Wherein
One end of described transformator connects described power supply, and the other end connects described rectifier bridge, and described three ends are steady
The input of depressor connects described rectifier bridge, the outfan of described three terminal regulator pass sequentially through tested button,
Described light emitting diode, described first resistance eutral grounding, the positive pole of described light emitting diode connects tested button,
The negative pole of described light emitting diode connects described first resistance, and described 7th resistance is photoconductive resistance, described
One end of 7th resistance connects the outfan of described three terminal regulator, and the other end of described 7th resistance connects
One end of described second resistance, the other end ground connection of described second resistance, one end of described 4th resistance is even
Connecing the outfan of described three terminal regulator, the other end of described 4th resistance connects the one of described 3rd resistance
End, the other end ground connection of described 3rd resistance, the inverting input of described operational amplifier is connected to described
Node between 4th resistance and described 3rd resistance, the in-phase input end of described operational amplifier is connected to
Node between described 7th resistance and described second resistance, one end of described 5th resistance connects described fortune
Calculate the outfan of amplifier, the base stage of the other end described audion of connection of described 5th resistance, described three
The coil of described first relay it is connected between outfan and the colelctor electrode of described audion of end manostat,
The grounded emitter of described audion, one end ground connection of described 6th resistance, another of described 6th resistance
End connects the base stage of described audion.
Further, described device used for testing life of key switch also includes the buzzer being connected with described enumerator.
In above-mentioned device used for testing life of key switch, described key switch break-make detection module also includes
One electric capacity, the second electric capacity and the 3rd electric capacity；Wherein
One end ground connection of described first electric capacity, the other end of described first electric capacity connects described three terminal regulator
Input, one end ground connection of described second electric capacity, the other end of described second electric capacity connects described three ends
The outfan of manostat, one end ground connection of described 3rd electric capacity, the other end of described 3rd electric capacity connects institute
State the base stage of audion.
In above-mentioned device used for testing life of key switch, described first relay and described 3rd relay divide
Not having two normally opened contacts, described second relay has a normally opened contact.
Further, the model of described time-delay relay is DH48S-S, and the model of described enumerator is
TCN-P61B, the model of described three terminal regulator is 7812, and the model of described amplifier is LM358.
The present invention cooperation by key switch break-make detection module, time-delay relay sum counter etc., right
The of short duration conducting of button, button turn on for a long time and do not have reliably to know by these several situations of handle to button
Not, thus the break-make of button can be counted and be effectively tested, substantially increase the accurate of test data
Degree, and reduce the labor intensity of laboratory technician.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is some embodiments of the present invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structure principle chart of the device used for testing life of key switch that the embodiment of the present invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment be a part of embodiment of the present invention rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making wound
The every other embodiment obtained under the property made work premise, broadly falls into the scope of protection of the invention.
Fig. 1 shows the structure principle chart of the device used for testing life of key switch that the embodiment of the present invention provides.
This device used for testing life of key switch includes time-delay relay K4, enumerator CO1, the first relay
K1, the second relay K the 2, the 3rd relay K 3, for circulating the button driving tested key switch
The button of knee-action drives module 1 and for detecting pressing of the conducting state of described tested key switch
Key switch break-make detection module 2.Wherein, one end of key switch break-make detection module 2 connects power supply, separately
One end connects the coil of the first relay K 1, and one end of the normally opened contact of the first relay K 1 connects described
Power supply, the other end connect time-delay relay K4, time-delay relay K4 also with the line of the second relay K 2
Circle connects, and the normally opened contact linkage counter CO1, enumerator CO1 of the second relay K 2 are also connected with institute
State power supply, the coil linkage counter CO1 of the 3rd relay K 3, the normally opened contact of the 3rd relay K 3
One end connect described power supply, the other end connect button drive module 2.Additionally, the survey of this key switch life-span
Electricity testing device also includes the buzzer SP1 being connected with enumerator CO1.
Key switch break-make detection module 1 includes transformator T, rectifier bridge B1, three terminal regulator U1, sends out
Light secondary light LED1, operational amplifier OP1, audion Q1, the first resistance R1, the second resistance R2,
3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7.Its
In, one end of transformator T connects described power supply, and the other end connects rectifier bridge B1, three terminal regulator U1
Input connect rectifier bridge B1, the outfan of three terminal regulator U1 passes sequentially through tested button, luminescence
Diode (LED) the 1, first resistance R1 ground connection, the positive pole of LED 1 connects tested button,
The negative pole of LED 1 connects the first resistance R1, and the 7th resistance R7 is photoconductive resistance, and the 7th
One end of resistance R7 connects the outfan of three terminal regulator U1, and the other end of the 7th resistance R7 connects the
One end of two resistance R2, the other end ground connection of the second resistance R2, one end of the 4th resistance R4 connects three
The outfan of end manostat U1, the other end of the 4th resistance R4 connects one end of the 3rd resistance R3, the
The other end ground connection of three resistance R3, the inverting input of operational amplifier OP1 is connected to the 4th resistance R4
And the node that the 3rd between resistance R3, the in-phase input end of operational amplifier OP1 is connected to the 7th resistance
Node between R7 and the second resistance R2, one end concatenation operation amplifier OP1's of the 5th resistance R5
Outfan, the base stage of the other end connecting triode Q1 of the 5th resistance R5, three terminal regulator U1's is defeated
Going out the coil being connected the first relay K 1 between end and the colelctor electrode of audion Q1, audion Q1 sends out
Emitter grounding, one end ground connection of the 6th resistance R6, the other end connecting triode Q1 of the 6th resistance R6
Base stage.Key switch break-make detection module 2 also includes the first electric capacity C1, the second electric capacity C2 and the 3rd
Electric capacity C3；Wherein, one end ground connection of the first electric capacity C1, it is steady that the other end of the first electric capacity C1 connects three ends
The input of depressor U1, one end ground connection of the second electric capacity C2, the other end of the second electric capacity C2 connects three
The outfan of end manostat U1, one end ground connection of the 3rd electric capacity C3, the other end of the 3rd electric capacity C3 is even
Connect the base stage of audion Q1.
The model of time-delay relay K4 is DH48S-S, and the model of enumerator CO1 is TCN-P61B,
The model of three terminal regulator U1 is 7812, and the model of operational amplifier OP1 is LM358.First relay
Device K1 and the 3rd relay K 3 are respectively provided with two normally opened contacts, and the first relay K 1 often has one
Open contact.
First relay K the 1, second relay K 2 and the coil of the 3rd relay K 3 and contact are at this dress
Concrete connected mode in putting is: one end of a normally opened contact of the first relay K 1 connects described power supply
Zero line N, the other end connect time-delay relay K4 2 feet, another of the first relay K 1 is normally opened
One end of contact connects the live wire L of described power supply, and the other end connects 8 feet and 7 feet of time-delay relay K4；
One end of the coil of the second relay K 2 connects the zero line N of described power supply, and the other end connects time-delay relay
6 feet of K4,4 feet (the i.e. 12V of one end linkage counter CO1 of the normally opened contact of the second relay K 2
Foot), 1 foot (i.e. INPUT foot) of other end linkage counter CO1；The coil of the 3rd relay K 3
One end connect described power supply live wire, 19 feet (i.e. NG foot) of other end linkage counter CO1,
And 18 feet (i.e. COM foot) of enumerator CO1 are connected with 19 feet, 18 feet also with described power supply
Zero line N connects.Additionally, 13 feet of enumerator CO1 and 15 feet respectively with the live wire L of described power supply and
Zero line N connects, and one end ground connection of thumper SP1,17 feet of other end linkage counter CO1 are (i.e.
NO foot).
Preparation before device used for testing life of key switch of the present invention uses is as follows: switch on power, and arranges
Time of staying t1(after button drives the button of module 2 to pop one's head on earth arranges a little bit smaller as far as possible, about 0.5-1
Second) and button pop one's head in minimum 2 seconds of time of staying t2(when pushing up)；Then enumerator CO1 is set
Break-make number of times (the break-make number of times of the most tested key switch)；Again by 1 foot and 3 of time-delay relay K4
Foot connects, and makes time-delay relay K4 single cycle work；The delay time of time-delay relay K4 is finally set
T1 and T2, T1 are t1+1 second (or several seconds of t1+, the speed with specific reference to test is determined), and T2 is set to
Long time, this time at least will equal to test tested key switch life-span required for time.
The specific works principle of device used for testing life of key switch of the present invention is as follows: be electrified, enumerator
CO1 starts working, and electric current arrives 18 feet of enumerator CO1,19 feet, the line of the 3rd relay K 3
Circle energising, the normally opened contact Guan Bi of the 3rd relay K 3, button drives module 2 to be energized and start working；
Electric current is through transformator T transformation simultaneously, then through rectifier bridge B1 rectification, filters through the first electric capacity C1
Ripple, exports stable 12V DC voltage, then through the second electric capacity C2 after three-terminal voltage-stabilizing circuit U 1
After filtering, electric current arrives the 7th resistance R7 and the second resistance R2, and the homophase to operational amplifier OP1 is defeated
Enter to hold input signal, simultaneously the 4th resistance R4 and the 3rd resistance R3 divide after voltage also to operational amplifier
The inverting input input reference voltage of OP1, thus operational amplifier OP1 starts working；Due to now
Button drives module 2 also not press tested button, and diode (LED) 1 of giving out light is the most luminous, the 7th resistance
There is high-impedance state in R7, and operational amplifier OP1 exports low-voltage, and audion Q1 is not turned on, and first continues
The coil no power of electrical equipment K1, the normally opened contact of the first relay K 1 does not closes, thus time-delay relay
K4 does not works, and the coil of the second relay K 2 is also the most not charged, the normally opened contact of the second relay K 2
Not closing, enumerator CO1 does not counts；When button drives module 2 to press, tested key switch is led
Logical, now Light-Emitting Diode LED1 is shinny, and the 7th resistance R7 resistance diminishes, and the second resistance R2 divides
Voltage high, operational amplifier OP1 output HIGH voltage, audion Q1 turns on, the first relay K 1
Coil electricity, the normally opened contact Guan Bi of the first relay K 1, the work thus time-delay relay K4 is energized,
T1 starts timing simultaneously, owing to the time of T1 drives module 1 residence time below more than button,
So when button drive module 1 return to original position by key head after, if tested key switch energy
Reliably turn on, and after it's 1 second keeping to past this state, 5 feet of time-delay relay K4 disconnect, and 6 feet are led
Logical, the coil electricity of the second relay K 2, the normally opened contact Guan Bi of the second relay K 2, enumerator CO1
Start counting up.
When tested key switch lock is dead (button drive module 1 return to original position by key head
Putting, the handle of tested key switch has also returned to topmost, cause tested key switch can not long time
Between turn on), now Light-Emitting Diode LED1 does not works, operational amplifier OP1 output low level, three poles
Pipe Q1 is not turned on, the coil blackout of the first relay K 1, and the normally opened contact of the first relay K 1 disconnects,
Time-delay relay K4 quits work, and enumerator CO1 the most no longer counts, and therefore count results is reliable；
When tested key switch is broken, and the handle of tested key switch is always in the conduction state in bottom, does not has
Have recovery function, then Light-Emitting Diode LED1 grows bright always, and the first relay K 1 closes always, and second
Relay K 2 is energized always, so enumerator CO1 the most or else counting, before recorded time
Number is exactly the number of times of the normal break-make of tested key switch；When tested key switch does not drives mould at button
Block 1 by time below key head (tested key switch pressing during do not fix, send out
Give birth to displacement), Light-Emitting Diode LED1 does not works always, then enumerator CO1 the most not counting.As occurred
Three cases above, when laboratory technician checks, it is possible to do corresponding process, although button drives mould
Block 1 is ceaselessly working, but does not affects the life test result of tested key switch.Normally
In the case of, when doing the break-make life test of the tested key switch that is over, 18 feet of enumerator CO1,19
Foot disconnects, and button drives module 1 to quit work, the 17 of unison counter CO1,18 foot conductings, buzzing
Device SP1 sends sound, notifies that laboratory technician tests and terminates.
The foregoing is only presently preferred embodiments of the present invention, be not limited to the present invention, all at this
Any amendment, equivalent and the improvement etc. made within the spirit of invention and principle, should be included in this
In the protection domain of invention.
Claims (6)
1. a device used for testing life of key switch, it is characterised in that described device include time-delay relay,
Enumerator, the first relay, the second relay, the 3rd relay, it is used for circulating the tested button of driving
The button of the button knee-action of switch drives module and for detecting the conducting shape of described tested key switch
The key switch break-make detection module of state；Wherein
One end of described key switch break-make detection module connects power supply, and the other end connects described first relay
The coil of device, one end of the normally opened contact of described first relay connects described power supply, and the other end connects institute
Stating time-delay relay, described time-delay relay also coil with described second relay is connected, and described second
The normally opened contact of relay connects described enumerator, and described enumerator is also connected with described power supply, and the described 3rd
The coil of relay connects described enumerator, and one end of the normally opened contact of described 3rd relay connects described
Power supply, the other end connects described button and drives module.
Device used for testing life of key switch the most according to claim 1, it is characterised in that described press
Key switch break-make detection module includes transformator, rectifier bridge, three terminal regulator, light-emitting diode light, computing
Amplifier, audion, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance,
6th resistance and the 7th resistance；Wherein
One end of described transformator connects described power supply, and the other end connects described rectifier bridge, and described three ends are steady
The input of depressor connects described rectifier bridge, the outfan of described three terminal regulator pass sequentially through tested button,
Described light emitting diode, described first resistance eutral grounding, the positive pole of described light emitting diode connects tested button,
The negative pole of described light emitting diode connects described first resistance, and described 7th resistance is photoconductive resistance, described
One end of 7th resistance connects the outfan of described three terminal regulator, and the other end of described 7th resistance connects
One end of described second resistance, the other end ground connection of described second resistance, one end of described 4th resistance is even
Connecing the outfan of described three terminal regulator, the other end of described 4th resistance connects the one of described 3rd resistance
End, the other end ground connection of described 3rd resistance, the inverting input of described operational amplifier is connected to described
Node between 4th resistance and described 3rd resistance, the in-phase input end of described operational amplifier is connected to
Node between described 7th resistance and described second resistance, one end of described 5th resistance connects described fortune
Calculate the outfan of amplifier, the base stage of the other end described audion of connection of described 5th resistance, described three
The coil of described first relay it is connected between outfan and the colelctor electrode of described audion of end manostat,
The grounded emitter of described audion, one end ground connection of described 6th resistance, another of described 6th resistance
End connects the base stage of described audion.
Device used for testing life of key switch the most according to claim 1 and 2, it is characterised in that institute
State the buzzer that device also includes being connected with described enumerator.
Device used for testing life of key switch the most according to claim 2, it is characterised in that described press
Key switch break-make detection module also includes the first electric capacity, the second electric capacity and the 3rd electric capacity；Wherein
One end ground connection of described first electric capacity, the other end of described first electric capacity connects described three terminal regulator
Input, one end ground connection of described second electric capacity, the other end of described second electric capacity connects described three ends
The outfan of manostat, one end ground connection of described 3rd electric capacity, the other end of described 3rd electric capacity connects institute
State the base stage of audion.
Device used for testing life of key switch the most according to claim 1 and 2, it is characterised in that institute
State the first relay and described 3rd relay is respectively provided with two normally opened contacts, described second relay utensil
There is a normally opened contact.
Device used for testing life of key switch the most according to claim 2, it is characterised in that described in prolong
Time relay model be DH48S-S, the model of described enumerator is TCN-P61B, and described three ends are steady
The model of depressor is 7812, and the model of described operational amplifier is LM358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310023070.4A CN103941179B (en) | 2013-01-22 | A kind of device used for testing life of key switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310023070.4A CN103941179B (en) | 2013-01-22 | A kind of device used for testing life of key switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103941179A CN103941179A (en) | 2014-07-23 |
| CN103941179B true CN103941179B (en) | 2016-11-30 |
Family
ID=
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201289519Y (en) * | 2008-09-25 | 2009-08-12 | 厦门金思维电子有限公司 | Key switch longevity test machine |
| CN201811897U (en) * | 2010-05-04 | 2011-04-27 | 深圳市九维科技有限公司 | Key switch endurance tester |
| CN202013405U (en) * | 2010-12-17 | 2011-10-19 | 杭州鸿雁电器有限公司 | Device for detecting life of inductive electronic time-delay switch |
| CN202110109U (en) * | 2011-06-29 | 2012-01-11 | 深圳市盈信电子科技有限公司 | Device used for testing life of key switch |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201289519Y (en) * | 2008-09-25 | 2009-08-12 | 厦门金思维电子有限公司 | Key switch longevity test machine |
| CN201811897U (en) * | 2010-05-04 | 2011-04-27 | 深圳市九维科技有限公司 | Key switch endurance tester |
| CN202013405U (en) * | 2010-12-17 | 2011-10-19 | 杭州鸿雁电器有限公司 | Device for detecting life of inductive electronic time-delay switch |
| CN202110109U (en) * | 2011-06-29 | 2012-01-11 | 深圳市盈信电子科技有限公司 | Device used for testing life of key switch |
Non-Patent Citations (1)
| Title |
|---|
| 用PLC实现电磁式开关电寿命试验的方法;吕峰;《电气开关》;20010831(第4期);第25页左栏第2段—第27页左栏第4段，图1-4 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201066369Y (en) | Polarity tester for current mutual inductor | |
| CN103197198A (en) | Cable checker | |
| CN202548267U (en) | Circuit for detecting live wire and zero wire | |
| CN204945296U (en) | A kind of cellular phone data line tester | |
| CN103941179B (en) | A kind of device used for testing life of key switch | |
| CN205450164U (en) | Pencil break -make detects frock | |
| CN106979467A (en) | A kind of Multi-function compatible type LED lamp tube | |
| CN207571226U (en) | A kind of relay protection outlet detecting system of failure initial time input | |
| CN102081147A (en) | Testing pen capable of displaying direct current and alternating current | |
| CN101972549A (en) | High-sensitivity induction type electricity measurer with strong and weak gears | |
| CN105203905A (en) | Electric energy measuring secondary circuit rapid line inspection instrument | |
| CN202256462U (en) | High-performance induction type electroscope | |
| CN205910326U (en) | Device for rapidly detecting cell voltage in battery pack | |
| CN103941179A (en) | Key switch life testing device | |
| CN204269795U (en) | Power supply automatic detecting equipment | |
| CN104165747A (en) | Portable testing device for falling weight impact test of mechanical switch | |
| CN103874294A (en) | Light control illumination device for sewing machine | |
| CN203838235U (en) | High-voltage alternating-current electroscope | |
| CN201196661Y (en) | Multifunctional AC electroprobe | |
| CN203629601U (en) | Intelligent testing device for fire hazard detector | |
| CN203643520U (en) | Optoelectronic coupler fault detector | |
| CN208076557U (en) | A kind of multi-functional automobile-used test pen | |
| CN207367454U (en) | The training device that a kind of multiple meter for automobile uses | |
| CN207114686U (en) | A kind of rack direct current reserves the test fixture of line | |
| CN203490311U (en) | Two-stage filter detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 Termination date: 20190122 |