CN108347873A - Measure method, equipment and the flexible PCB quality management-control method of flexible PCB pliability - Google Patents
Measure method, equipment and the flexible PCB quality management-control method of flexible PCB pliability Download PDFInfo
- Publication number
- CN108347873A CN108347873A CN201810064754.1A CN201810064754A CN108347873A CN 108347873 A CN108347873 A CN 108347873A CN 201810064754 A CN201810064754 A CN 201810064754A CN 108347873 A CN108347873 A CN 108347873A
- Authority
- CN
- China
- Prior art keywords
- support element
- flexible pcb
- pliability
- flexible
- support
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
- H05K13/08—Monitoring manufacture of assemblages
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0266—Marks, test patterns or identification means
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Operations Research (AREA)
- Manufacturing & Machinery (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention provides method, equipment and the flexible PCB quality management-control method for measuring flexible PCB pliability.This method includes：Respectively with the opposite first end and second end of the first support element and the second supports support flexible PCB, wherein have gap between first support element and second support element；The flexible PCB is pushed above position corresponding with the gap, the flexible PCB is made to move down predetermined displacement, records the pliability for pushing the pressure applied and being used to characterize the flexible PCB.Inventor has found that this method is simple, convenient, and measurement result accuracy is higher, is easily operated automatically and implements on a large scale, and measuring obtained pliability can be with the folding s tress of Efficient Characterization FPC.
Description
Technical field
The present invention relates to electronic device fields, specifically, being related to measuring the method for flexible PCB pliability, equipment and soft
Property board quality management-control method.
Background technology
In existing electronic equipment, flexible PCB (FPC) is indispensable component, and usually requires bending setting, but
Difference in thickness caused by the FPC or tolerance of different raw material shows just there is different stress in the bending of FPC, especially
Stress difference performance is apparent when length is shorter, and have when stress difference has obvious unfavorable shadow to assembling, bending etc.
It rings.To eliminate above-mentioned stress difference, reach assembling, bending strength consistency, it is unified with stress for the FPC of identical size
The form of expression is managed the problem of being urgent need to resolve.
Invention content
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, the present invention
Purpose be to propose it is a kind of it is simple, convenient, can be with the means of Efficient Characterization FPC folding s tress.
In one aspect of the invention, the present invention provides a kind of method measuring flexible PCB pliability.According to this hair
Bright embodiment, this method include：Respectively with the opposite first end of the first support element and the second supports support flexible PCB
And second end, wherein there is gap between first support element and second support element；In position corresponding with the gap
It sets top to push the flexible PCB, the flexible PCB is made to move down predetermined displacement, record the pressure for pushing and applying
Power is used to characterize the pliability of the flexible PCB.Inventor has found that this method is simple, convenient, and measurement result is accurate
Degree is higher, is easily operated automatically and implements on a large scale, and the pliability that measurement obtains can be answered with the bending of Efficient Characterization FPC
Power can improve consistent by FPC similar in pliability for manufacturing same type product to avoid the difference between product individual
Property, it is conducive to improve yield and better quality management and control.
According to an embodiment of the invention, the first end and the second end are phase on the flexible PCB length direction
To both ends.
According to an embodiment of the invention, when the flexible PCB being pushed, the first end of the flexible PCB is fixed
On first support element.
According to an embodiment of the invention, applying pressure in the presumptive area of the flexible PCB makes it move down, described pre-
Determine that region is in a strip shape, and the length direction of the strip hangs down with the distribution arrangement of first support element and second support element
Directly.
According to an embodiment of the invention, the predetermined displacement is more than 1 millimeter and less than the one of the flexible PCB length
Half.
In another aspect of this invention, the present invention provides a kind of flexible PCB quality management-control methods.According to the present invention
Embodiment, this method includes：Under identical testing conditions, a series of flexible PCBs are measured using foregoing method
Pliability；The flexible PCB of the pliability within preset range is used for same purposes.Inventor has found, leads to
It crosses and same purposes (such as preparing same type product), Ke Yiyou is used for using the flexible PCB of pliability within preset range
Effect reduces the stress difference caused by FPC between product individual, improves product yield, and is conducive to preferably carry out quality to product
Management and control.
In another aspect of the invention, the present invention provides a kind of equipment measuring flexible PCB pliability.According to this
The embodiment of invention, the equipment include：First support element and the second support element, first support element and second support element
Interval setting, is used to support flexible PCB；One far from the pedestal in first support element is arranged in briquetting, the briquetting
Side, for pressurizeing to the flexible circuit board.Inventor has found that the equipment can be effectively used for measuring the soft of flexible PCB
Softness, it is simple in structure, it is easy to operate, and measurement result is accurate.
According to an embodiment of the invention, which further includes pedestal, and first support element and second support element are set
It sets on the pedestal, and first support element is fixedly connected with the pedestal, second support element can with the pedestal
It is slidably connected.
According to an embodiment of the invention, sliding slot is provided on the pedestal, second support element is equipped with described
In sliding slot, and it can be slided along the sliding slot.
According to an embodiment of the invention, it is provided with the second fixing piece on the sliding slot, for fixing second support element.
According to an embodiment of the invention, it is provided with the first fixing piece on first support element, for fixing the flexibility
The first end of circuit board.
According to an embodiment of the invention, there is the briquetting pressure head, the pressure head to be in direct contact with the flexible PCB
Surface it is in a strip shape, and the distribution arrangement of the length direction of the strip and first support element and second support element hangs down
Directly.
Description of the drawings
Fig. 1 is the structural schematic diagram of the equipment of the detection flexible PCB pliability of one embodiment of the invention.
Fig. 2 is the cross-sectional view of line A-A in Fig. 1.
Fig. 3 is the structural schematic diagram of the equipment of the detection flexible PCB pliability of one embodiment of the invention.
Fig. 4 is the structural schematic diagram of the equipment of the detection flexible PCB pliability of one embodiment of the invention.
Specific implementation mode
The embodiment of the present invention is described below in detail.The embodiments described below is exemplary, and is only used for explaining this hair
It is bright, and be not considered as limiting the invention.Particular technique or condition are not specified in embodiment, according to text in the art
It offers described technology or condition or is carried out according to product description.Reagents or instruments used without specified manufacturer,
For can be with conventional products that are commercially available.
In one aspect of the invention, the present invention provides a kind of method measuring flexible PCB pliability.According to this hair
Bright embodiment, this method include：Respectively with the opposite first end of the first support element and the second supports support flexible PCB
And second end, wherein there is gap between first support element and second support element；In position corresponding with the gap
It sets top to push the flexible PCB, the flexible PCB is made to move down predetermined displacement, record the pressure for pushing and applying
Power is used to characterize the pliability of the flexible PCB.Inventor has found that this method is simple, convenient, and measurement result is accurate
Degree is higher, is easily operated automatically and implements on a large scale, and the pliability that measurement obtains can be answered with the bending of Efficient Characterization FPC
Power can improve consistent by FPC similar in pliability for manufacturing same type product to avoid the difference between product individual
Property, it is conducive to improve yield and better quality management and control.
According to an embodiment of the invention, the concrete structure of flexible PCB, shape, material etc. do not have any restrictions, can be with
For any of flexible PCB in this field, no longer excessively repeat herein.
According to an embodiment of the invention, the concrete shape of the first support element and the second support element, structure, material etc. are without spy
It does not limit, as long as disclosure satisfy that the requirement of support flexible PCB, those skilled in the art can be selected flexibly as needed
It selects.Such as it can include but is not limited to the massive support part of the formation such as metal, ceramics, organic material, the branch with supporting plane
Support etc..Simple in structure as a result, cost is relatively low, and support effect is preferable.
According to an embodiment of the invention, when pushing, the contact of flexible PCB and the first support element and the second support element
Connection type is not particularly limited, and in some embodiments, can flexible PCB be only against first by the pressure of pushing
On support element and the second support element, as long as ensureing that flexible PCB will not be from the first support element and the second support element during pushing
On slip off；In further embodiments, when pushing the flexible PCB, the first end of the flexible PCB is solid
It is scheduled on first support element.Thus, it is possible to preferably fix flexible PCB, flexible PCB is effectively avoided to be pressed through under
It is slid in journey, measurement effect is more preferably.
According to an embodiment of the invention, the specific location of the first end and second end of flexible PCB is not particularly limited,
As long as opposite both ends on flexible PCB.In some embodiment of the invention, since flexible PCB is actually being answered
Used time usually bends in the longitudinal direction, therefore the first end and the second end are on the flexible PCB length direction
Opposite both ends.Thus the soft degrees of data measured can more embody the folding s tress difference of flexible PCB in actual product, right
Flexible PCB is bent and assembling product has more reference value and directive significance.
According to an embodiment of the invention, stressed position is applied to the flexible PCB not show especially, as long as with
The interstitial site corresponds to, and can flexible PCB effectively be moved down.In order to improve accuracy in detection, the present invention's
In some preferred embodiments, applying pressure in the presumptive area of the flexible PCB makes it move down, and the presumptive area is in item
Shape, and the length direction of the strip presumptive area hangs down with the distribution arrangement of first support element and second support element
Directly.It is furthermore preferred that the length of the strip presumptive area and the flexible PCB are on the length direction of the presumptive area
Width it is equal.Flexible PCB is more uniformly stressed as a result, and accuracy in detection is more preferably.
According to an embodiment of the invention, in order to enable to measure obtained data more acurrate, to the quality pipe of flexible PCB
Control has more directive significance, and in some embodiments of the invention, the predetermined displacement that flexible PCB moves down is more than 1 millimeter and is less than
The half of the flexible PCB length.Unlike material, thickness flexible electrical can preferably be embodied by measuring the parameter of acquisition as a result,
Difference of the road plate in pliability has more Practical significance for flexible PCB management and control.
In another aspect of this invention, the present invention provides a kind of flexible PCB quality management-control methods.According to the present invention
Embodiment, this method includes：Under identical testing conditions, a series of flexible PCBs are measured using foregoing method
Pliability；The flexible PCB of the pliability within preset range is used for same purposes.Inventor has found, leads to
It crosses and same purposes is used for using the flexible PCB of pliability within preset range, can effectively reduce containing changing flexible circuit
The stress difference caused by FPC between the product individual of plate improves product yield, and is conducive to preferably carry out quality pipe to product
Control.
According to an embodiment of the invention, above-mentioned " being used for same purposes " shall be understood in a broad sense, and can be by flexible circuit
Plate is used for the same position of product, such as connecting the pliability of display screen and the flexible PCB of IC all pre- in mobile phone
Within the scope of fixed；Can also be same model product use flexible PCB pliability within preset range, such as
The mobile phone of two same models of batch production, wherein the pliability of the flexible PCB used is all within preset range.
According to an embodiment of the invention, above-mentioned testing conditions can be to be any with the relevant parameter of detection, condition, such as wraps
Include but be not limited to size (such as can be 30mm × 10mm), flexible PCB and the first support element and second of flexible circuit board
The relative position of support element applies stressed position, forced area size etc..
According to an embodiment of the invention, above-mentioned preset range is not particularly limited, and those skilled in the art can be according to soft
The suitable standards of formulations such as practical pliability, application environment and the performance requirement of property circuit board, no longer excessively repeat herein.
In another aspect of the invention, the present invention provides a kind of equipment measuring flexible PCB pliability.According to this
The embodiment of invention, referring to figs. 1 to Fig. 4, which includes：First support element 10 and the second support element 20, first support
Part 10 and the setting of second support element 20 interval, are used to support flexible PCB 30；Briquetting 40, the briquetting 40 are arranged in institute
The top for stating the first support element 10, for pressurizeing to the flexible circuit board 30 and it being made to move down predetermined displacement.Inventor's discovery,
The equipment can be effectively used for measuring the pliability of flexible PCB, simple in structure, easy to operate, and measurement result is accurate.
According to an embodiment of the invention, with reference to Fig. 2, which further includes pedestal 50, first support element 10 and described
Second support element 20 is arranged on the pedestal 50, and first support element 10 is fixedly connected with the pedestal 50, and described the
Two support elements 20 and 50 slidable connection of the pedestal.Thus, it is possible to pass through flexibly adjustment and the first support of the second support element
Spacing distance between part, to be suitable for various sizes of flexible PCB.
According to an embodiment of the invention, with reference to Fig. 3 and Fig. 4, sliding slot 60, second support element are provided on the pedestal
20 are equipped in the sliding slot 60, and can be slided along the sliding slot.It is simple in structure as a result, it is easy to operate, it is easy to real
Existing, cost is relatively low.
According to an embodiment of the invention, with reference to Fig. 3 and Fig. 4, it is provided with the second fixing piece 61 on the sliding slot, for fixing
Second support element 20.Specifically, the specific type of the second fixing piece is not particularly limited, as long as being slided by the second support element
The second support element can be fixed when moving suitable position.In some embodiments of the invention, the second fixing piece can be with
For screw, it is possible thereby to which easily the second support element is fixed in place by tightening screw.
According to an embodiment of the invention, with reference to Fig. 3 and Fig. 4, it is provided with the first fixing piece 11 on first support element 10,
First end for fixing the flexible PCB 30.It, can be with specifically, the specific type of the first fixing piece is not particularly limited
For fixture, fixing bracket etc..Thus, it is possible to preferably fix flexible PCB, flexible PCB in pressure process is avoided to slide.
According to an embodiment of the invention, the concrete structure of briquetting and shape are not particularly limited, as long as being suitable for flexible electrical
Road plate pressurizes and it is made to move down.In some embodiments of the invention, referring to Fig.1, the briquetting 40 has pressure head 41, institute
It is in a strip shape to state the surface that pressure head 41 and the flexible PCB 30 are in direct contact, and the length direction of the strip and described first
Support element 10 is vertical with the distribution arrangement of second support element 20.Flexible PCB stress is more preferably uniform as a result, and detection is accurate
Spend higher.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on ... shown in the drawings or
Position relationship is merely for convenience of description of the present invention and simplification of the description, and does not indicate or imply the indicated device or element must
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more this feature.In the description of the present invention, the meaning of " plurality " is two or more,
Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；Can be that machinery connects
It connects, can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary in two elements
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is directly under or diagonally below the second feature, or is merely representative of fisrt feature level height and is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (12)
1. a kind of method measuring flexible PCB pliability, which is characterized in that including：
Respectively with the opposite first end and second end of the first support element and the second supports support flexible PCB, wherein described
There is gap between first support element and second support element；
The flexible PCB is pushed above position corresponding with the gap, the flexible PCB is made to move down pre-determined bit
It moves, records the pliability for pushing the pressure applied and being used to characterize the flexible PCB.
2. according to the method described in claim 1, it is characterized in that, the first end and the second end are the flexible circuit
Opposite both ends on plate length direction.
3. according to the method described in claim 1, it is characterized in that, when the flexible PCB is pushed, the flexible circuit
The first end of plate is fixed on first support element.
4. according to the method described in claim 1, it is characterized in that, the presumptive area application pressure in the flexible PCB makes
It is moved down, and the presumptive area is in a strip shape, and the length direction of the strip and first support element and second support
The distribution arrangement of part is vertical.
5. according to the method described in claim 1, it is characterized in that, the predetermined displacement is more than 1 millimeter and is less than the flexibility
The half of circuit board length.
6. a kind of flexible PCB quality management-control method, which is characterized in that including：
Under identical testing conditions, a series of flexible PCBs are measured using the method described in any one of claim 1-5
Pliability；
The flexible PCB of the pliability within preset range is used for same purposes.
7. a kind of equipment measuring flexible PCB pliability, which is characterized in that including：
First support element and the second support element, first support element and the setting of second support element interval, are used to support soft
Property circuit board；
Briquetting, the briquetting is arranged in the top of first support element far from the pedestal, for the flexible circuit board
It pressurizes and it is made to move down predetermined displacement.
8. equipment according to claim 7, which is characterized in that further include pedestal, first support element and described second
Support element is arranged on the pedestal, and first support element is fixedly connected with the pedestal, second support element and institute
State pedestal slidable connection.
9. equipment according to claim 8, which is characterized in that be provided with sliding slot, second support element on the pedestal
It is equipped in the sliding slot, and can be slided along the sliding slot.
10. equipment according to claim 9, which is characterized in that the second fixing piece is provided on the sliding slot, for fixing
Second support element.
11. equipment according to claim 7, which is characterized in that be provided with the first fixing piece on first support element, use
In the first end of the fixation flexible PCB.
12. equipment according to claim 7, which is characterized in that the briquetting has pressure head, the pressure head and the flexibility
The surface that circuit board is in direct contact is in a strip shape, and the length direction of the strip and first support element and second support
The distribution arrangement of part is vertical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810064754.1A CN108347873A (en) | 2018-01-23 | 2018-01-23 | Measure method, equipment and the flexible PCB quality management-control method of flexible PCB pliability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810064754.1A CN108347873A (en) | 2018-01-23 | 2018-01-23 | Measure method, equipment and the flexible PCB quality management-control method of flexible PCB pliability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108347873A true CN108347873A (en) | 2018-07-31 |
Family
ID=62961184
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810064754.1A Pending CN108347873A (en) | 2018-01-23 | 2018-01-23 | Measure method, equipment and the flexible PCB quality management-control method of flexible PCB pliability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108347873A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200714882A (en) * | 2005-10-04 | 2007-04-16 | Advanced Semiconductor Eng | Bending test fixture |
| CN102830253A (en) * | 2012-09-18 | 2012-12-19 | 苏州派立康电子科技有限公司 | General test connecting base |
| CN203606236U (en) * | 2013-11-13 | 2014-05-21 | 昆山龙腾光电有限公司 | Bonding strength and bending resistance testing device for flexible circuit board |
| CN203934116U (en) * | 2014-05-05 | 2014-11-05 | 深圳统聚光电有限公司 | Flexible PCB manual test, burning jig |
-
2018
- 2018-01-23 CN CN201810064754.1A patent/CN108347873A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200714882A (en) * | 2005-10-04 | 2007-04-16 | Advanced Semiconductor Eng | Bending test fixture |
| CN102830253A (en) * | 2012-09-18 | 2012-12-19 | 苏州派立康电子科技有限公司 | General test connecting base |
| CN203606236U (en) * | 2013-11-13 | 2014-05-21 | 昆山龙腾光电有限公司 | Bonding strength and bending resistance testing device for flexible circuit board |
| CN203934116U (en) * | 2014-05-05 | 2014-11-05 | 深圳统聚光电有限公司 | Flexible PCB manual test, burning jig |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7777500B2 (en) | Methods for characterizing dielectric properties of parts | |
| CN110161312B (en) | One-dimensional and two-dimensional material broadband impedance measurement device and method based on microstrip line method | |
| JP2016540991A (en) | Bending test method and bending test system for flexible screen | |
| CN109211182B (en) | Circuit board deformation degree measuring device and method | |
| CN108347873A (en) | Measure method, equipment and the flexible PCB quality management-control method of flexible PCB pliability | |
| CN107917929A (en) | A kind of parallel hot line heat conduction coefficient tester of high accuracy unstable state and its test method | |
| Ferrero et al. | Modern measurements: Fundamentals and applications | |
| CN203465028U (en) | Multi-channel temperature monitor based on NTC temperature sensor | |
| Rytting | ARFTG 50 year network analyzer history | |
| CN105101775B (en) | Temperature measuring plate device and temperature measuring plate thereof | |
| JPH11500536A (en) | Method and apparatus for high-speed scanning of electromagnetic field level | |
| Hou et al. | Contactless measurement of absolute voltage waveforms by a passive electric-field probe | |
| CN205484443U (en) | Perpendicular probe of suspension type | |
| Pearce et al. | Characterisation of a selection of AC and DC resistance bridges for standard platinum resistance thermometry | |
| Saghafi et al. | Improved linear regression method for estimating Weibull parameters | |
| CN105466575A (en) | Measurement device and calibration method used for consistency calibration | |
| CN111351983A (en) | Power consumption measuring system and method thereof | |
| CN108344623A (en) | Measure the method and apparatus and flexible PCB quality management-control method of flexible PCB pliability | |
| CN209311578U (en) | A kind of silicon core mechanism for testing | |
| Pence | Verification of LRRM calibrations with load inductance compensation for CPW measurements on GaAs substrates | |
| CN215177353U (en) | Digital display micrometer for polyimide film quality inspection | |
| CN201673210U (en) | High frequency dielectric loss measurement apparatus for enamelled wires | |
| CN204903589U (en) | Fixing tool of measuring instrument probe | |
| CN109446680A (en) | Plate detection device supporting pin position optimization design method and device | |
| CN217689368U (en) | Calibration device for ground resistance tester of ground grid |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180731 |
|
| RJ01 | Rejection of invention patent application after publication |