CN110308413A - A kind of contactless static detector calibrating installation and calibration method - Google Patents
A kind of contactless static detector calibrating installation and calibration method Download PDFInfo
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- CN110308413A CN110308413A CN201910730011.8A CN201910730011A CN110308413A CN 110308413 A CN110308413 A CN 110308413A CN 201910730011 A CN201910730011 A CN 201910730011A CN 110308413 A CN110308413 A CN 110308413A
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- 238000009434 installation Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 32
- 230000001681 protective effect Effects 0.000 claims description 11
- 238000005421 electrostatic potential Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 7
- 150000002500 ions Chemical class 0.000 description 6
- 230000005686 electrostatic field Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
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- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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Abstract
The present invention relates to the test of instrument and meter and field of measuring techniques, a kind of contactless static detector calibrating installation and calibration method are disclosed.Contactless static detector calibrating installation includes support frame, plate calibration electrodes and test arm；Plate calibration electrodes are horizontal positioned, and the side of plate calibration electrodes is equipped with multiple insulating fixing pieces, and one end of insulating fixing piece is connect with plate calibration electrodes, and the other end is connect with support frame；Test arm is equipped with the mounting portion for installing contactless static detector, and mounting portion is placed in the center above plate calibration electrodes.Contactless static detector calibrating installation and calibration method provided by the invention, when carrying out voltage calibration or zero potential calibration to contactless static detector, the electrostatic charge accumulated in insulating fixing piece will not have an impact calibration, improve the accuracy of contactless static detector calibration.
Description
Technical field
The present invention relates to the test of instrument and meter and field of measuring techniques more particularly to a kind of contactless static detectors
Calibrating installation and calibration method.
Background technique
Electrostatic voltmeter is widely used in electrostatic protection measurement and electrostatic research, there is contact and contactless two type
Type, wherein Non-contact Electrostatic Voltmeter is common one kind.It utilizes electric field sense in the case where not contacting with measured surface
Principle or other principles are answered, the voltage and Electric Field Numerical of measured surface are measured.The measured value of contactless static detector is
It is no accurate and reliable, it needs to be calibrated with calibrating installation.
In the prior art, the insulating support of calibrating installation has wrapped up plate calibration electrodes, rather than is placed in plate calibration electrodes
Side, and plate calibration electrodes is made to cover all insulating fixing piece, which can carry out compared with Gao Jing static detector
After the calibration test of voltage value, then zero potential calibration is carried out to static detector, it will static detector is caused to detect tens
To the electrostatic pressure of several hectovolts, the reason of such phenomenon occurs, is as follows:
1, for metal plate calibration electrodes because of the limitation of processing technology, surface inevitably will appear small tip knot
Structure, these small cutting-edge structures can generate corona discharge under high voltages, generate positive and negative air ion, and partial air ion is inhaled
It is attached to the high insulating element surface near plate calibration electrodes, the earth can not be moved to, and then electrostatic charge field is formed to outside, produced
The raw electrostatic pressure that can measure.Longer when the high rest potential calibration duration, the electrostatic charge of high insulating element surface accumulation is more,
Background electrostatic pressure value when carrying out zero potential calibration again is bigger.
2, when applying high electrostatic pressure to metal plate calibration electrodes, plate calibration electrodes is made the last one electrostatic field nearby occur,
And surrounding space environment meeting naturally occurring has minimal amount of positive and negative air ion, these ions can be hit under strong electrostatic field
Surrounding air molecule is hit, ionization by collision is generated, gradually produces more and more air ions, these air ions are attached to height
Insulating element surface can not be moved to the earth, and then form electrostatic charge field to outside, generate the electrostatic pressure that can measure.
3, when applying high electrostatic pressure to metal plate calibration electrodes, plate calibration electrodes is made the last one electrostatic field nearby occur,
And because of the limitation of processing technology, the surface of the high insulating element of fixed plate normal electrode inevitably will appear small point
End structure in these small points is easy to that electric field is caused to concentrate, and accumulates electrostatic charge.
The phenomenon as caused by the above reason easily causes calibration personnel on high insulating element surface, and there is also electrostatic charges
In the case of, accidentally clear operation is carried out to static detector, to cause electrostatic detection value error to become larger, and in no electrostatic charge environment
In show electrostatic pressure value, the use of static detector is caused greatly to interfere.
Summary of the invention
The purpose of the present invention is to provide a kind of contactless static detector calibrating installation and calibration methods, connect to non-
When touch static detector carries out voltage calibration or zero potential calibration, the electrostatic charge accumulated in insulating fixing piece will not produce calibration
It is raw to influence, improve the accuracy of contactless static detector calibration.
To achieve this purpose, the present invention adopts the following technical scheme:
A kind of contactless static detector calibrating installation, comprising:
Support frame；
Plate calibration electrodes, the plate calibration electrodes are horizontal positioned, and the side of the plate calibration electrodes is equipped with more
A insulating fixing piece, one end of the insulating fixing piece are connect with the plate calibration electrodes, and the other end and support frame as described above connect
It connects；
Test arm, the test arm are equipped with the mounting portion for installing contactless static detector, and the installation
Portion is placed in the center above the plate calibration electrodes.
Preferably, support frame as described above includes square frame and along the first support of the square frame being diagonally arranged and
Two brackets, support frame as described above are connected with ground wire.
Preferably, the side of the plate calibration electrodes is set there are five the insulating fixing piece；
The center of the plate calibration electrodes is connect with one end of the insulating fixing piece, the insulating fixing piece it is another
End is connect with the infall of the first support and the second support；
The plate calibration electrodes are circumferentially uniformly distributed four insulating fixing pieces, insulating fixing piece described in two of them
The central symmetry of the relatively described plate calibration electrodes is installed in the first support, and insulating fixing piece described in another two is with respect to institute
The central symmetry for stating plate calibration electrodes is installed in the second support.
Preferably, the insulating fixing piece includes cylindrical tetrafluoro fixing piece.
Preferably, the material of the plate calibration electrodes is stainless steel, and the surface of the plate calibration electrodes is in mirror surface.
Preferably, one end of the test arm is connected with the first driving assembly for driving the test arm lifting, the survey
The mounting portion is arranged in the other end for trying arm.
Preferably, first driving assembly includes motor, screw rod and the screw that connection is matched with the screw rod, the electricity
The output end of machine is connect with one end of the screw rod, and the test arm is connect with the screw.
Preferably, the periphery of support frame as described above is equipped with protective frame, and the protective frame and support frame as described above integrally connected, institute
The height for stating protective frame is higher than the plate calibration electrodes.
Preferably, the plate calibration electrodes are connected with DC high-voltage power supply.
A kind of calibration method of contactless static detector, for above-mentioned contactless static detector calibrating installation
In, comprising the following steps:
Contactless static detector is installed on to the mounting portion of test arm, is placed in the contactless static detector
The middle part of plate calibration electrodes；
Adjust the measuring distance between the contactless static detector and the plate calibration electrodes；
To the plate calibration electrodes outputting standard voltage, the plate school is detected with the contactless static detector
The voltage of collimator electrode obtains electrostatic potential value；
Compare the normal voltage and the electrostatic potential value, obtains calibration error.
Insulating fixing piece: being arranged in the side of plate normal electrode by beneficial effects of the present invention, make plate calibration electrodes
Insulating fixing piece is covered all, when carrying out electrostatic setting or zero potential and calibrating, the electrostatic that is accumulated in insulating fixing piece
Lotus will not impact the calibration of contactless static detector, and plate calibration electrodes meeting automatic shield is in plate calibration electricity
The electrostatic charge in insulating fixing piece below pole, the electrostatic field for generating electrostatic charge can not pass through plate calibration electrodes to upload
It is defeated；Calibration personnel is avoided on insulating fixing piece surface there is also accidentally clear operation is carried out in the case where electrostatic charge, to make non-
Contact-type electrostatic detector occurs electrostatic detection value error in use and becomes larger, and shows in no electrostatic charge environment quiet
The problem of voltage value, improves the accuracy of contactless static detector calibration.
Detailed description of the invention
Fig. 1 is the side view of contactless static detector calibrating installation provided in an embodiment of the present invention；
Fig. 2 is the top view of contactless static detector calibrating installation provided in an embodiment of the present invention；
Fig. 3 is the partial structural diagram of contactless static detector calibrating installation provided in an embodiment of the present invention.
In figure:
1, support frame；11, square frame；12, first support；13, second support；
2, plate calibration electrodes；
3, insulating fixing piece；
4, test arm；
5, mounting portion；
6, the first driving assembly；61, motor；62, screw；
7, protective frame；71, the first frame；72, the second frame；
8, DC high-voltage power supply；
9, connection frame.
Specific embodiment
To keep the technical problems solved, the adopted technical scheme and the technical effect achieved by the invention clearer, below
It will be described in further detail in conjunction with technical solution of the attached drawing to the embodiment of the present invention, it is clear that described embodiment is only
It is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
In the description of the present invention unless specifically defined or limited otherwise, term " connected ", " connection ", " fixation " are answered
It is interpreted broadly, for example, it may be being fixedly connected, may be a detachable connection, or is integral；It can be mechanical connection,
It can be electrical connection；It can be directly connected, the company inside two elements can also be can be indirectly connected through an intermediary
Logical or two elements interaction relationship.For the ordinary skill in the art, can be understood with concrete condition above-mentioned
The concrete meaning of term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
Contactless static detector in the present embodiment can be contactless electrometer or contactless electrostatic
Sensor can also be other for detecting the contactless device of electrostatic potential, be not limited thereto.
In the present embodiment, as shown in Figs. 1-2, contactless static detector calibrating installation includes support frame 1, support frame
1 top is equipped with plate calibration electrodes 2, and plate calibration electrodes 2 are horizontal positioned, and the side of plate calibration electrodes 2 is equipped with multiple
Where 2 downside of plate calibration electrodes is arranged in insulating fixing piece 3, i.e. insulating fixing piece 3 in the normal direction space of plane, it cannot exceed
Plane where plate calibration electrodes 2, makes plate calibration electrodes 2 cover all insulating fixing piece 3.The one of insulating fixing piece 3
End is connect with plate calibration electrodes 2, and the other end of insulating fixing piece 3 is connect with support frame 1.Contactless static detector calibration
Device further includes test arm 4, and test arm 4 is equipped with the mounting portion 5 for installing contactless static detector, and mounting portion 5
It is placed in the center of 2 top of plate calibration electrodes.
Insulating fixing piece 3 is arranged in the side of plate normal electrode 2, plate calibration electrodes 2 is made to cover all insulation
Fixing piece 3, when carrying out electrostatic setting or zero potential is calibrated, the electrostatic charge accumulated in insulating fixing piece 3 will not connect to non-
The calibration of touch static detector impacts, and the meeting automatic shield of plate calibration electrodes 2 is in the exhausted of 2 lower section of plate calibration electrodes
Electrostatic charge on edge fixing piece 3, the electrostatic field for generating electrostatic charge can not pass through plate calibration electrodes 2 and transmit upwards；It avoids
Calibration personnel 3 surface of insulating fixing piece there is also carried out in the case where electrostatic charge accidentally clear operation, to make contactless quiet
Photodetector occurs electrostatic detection value error in use and becomes larger, and shows electrostatic pressure value in no electrostatic charge environment
Problem improves the accuracy of contactless static detector calibration.
In the present embodiment, support frame 1 includes upper layer and lower layer square frame 11 disposed in parallel, and two layers of square frame 11 is logical
Cross vertically arranged connecting rod connection, the diagonal setting first support 12 and second of the square frame 11 on upper layer along square frame 11
Bracket 13, and the middle part interconnection at the middle part of first support 12 and second support 13.
The side of plate calibration electrodes 2 is set there are five insulating fixing piece 3, and the center of plate calibration electrodes 2 is arranged one absolutely
One end of edge fixing piece 3, the insulating fixing piece 3 is connect with the center of plate calibration electrodes 2, the other end and first support 12 and the
The infall of two brackets 13 connects.Remaining four insulating fixing pieces 3 are uniformly distributed along the circumferential direction of plate calibration electrodes 2, wherein
The central symmetry of two 3 opposing plates calibration electrodes 2 of insulating fixing piece is installed in first support 12, another two insulating fixing piece
The central symmetry of 3 opposing plates calibration electrodes 2 is installed in second support 13.
Insulating fixing piece 3 is integrally provided in the space of 2 downside of plate calibration electrodes, must not exceed plate calibration electrodes 2
The plane at place improves the accuracy of contactless static detector calibration.Five insulating fixing pieces 3 are arranged to calibrate plate
Electrode 2 is stably installed on support frame 1, and the distributed architecture of five insulating fixing pieces 3 can be effectively prevented from insulating fixing piece 3
It is influenced caused by calibration of the electrostatic charge of accumulation contactless static detector.
In the present embodiment, insulating fixing piece 3 includes tetrafluoro fixing piece, good insulation preformance.
In the present embodiment, the material of plate calibration electrodes 2 is stainless steel, and the surface of plate calibration electrodes 2 is in mirror surface.
When processing the plate calibration electrodes 2, the surface of plate calibration electrodes 2 is not in small cutting-edge structure, avoids tip
Structure generates corona discharge at a dc voltage, influences the calibration of contactless static detector.
As shown in figure 3, plate calibration electrodes 2 are connected with DC high-voltage power supply 8, DC high-voltage power supply 8 makes plate calibration electricity
Pole 2 has electrostatic pressure, and the calibration for contactless static detector provides normal voltage.
When calibrating contactless static detector, need to adjust the contactless electrostatic detection being mounted in test arm 4
The position of device.In the present embodiment, one end of test arm 4 is connected with the first driving assembly 6 that driving test arm 4 is gone up and down, test
Mounting portion 5 is arranged in the other end of arm 4, and mounting portion 5 is placed in the medium position of 2 top of plate calibration electrodes, the first driving assembly 6
Drive test arm 4 close to or far from plate calibration electrodes 2.
In the present embodiment, the first driving assembly 6 is fixed on connection frame 9, and the first driving assembly 6 includes motor 61, silk
Bar and the screw 62 that connection is matched with screw rod, the output end of motor 61 and one end of screw rod connect, and test arm 4 and screw 62 connect
It connects.Controller controls motor 61 and works, and the rotation of motor 61 drives screw rod rotation, and screw rod rotation drives screw 62 to move up and down, into
And test arm 4 is driven to move up and down.In other embodiments, the first driving assembly 6 can also be other structures, not limit herein
It is fixed.
Further, it is also possible to which the second driving assembly is arranged, the second driving assembly drives the first driving assembly 6 to move horizontally, with
Adjust the position of contactless static detector in the horizontal direction.Second driving assembly can be screw rod screw structure, and first
Driving assembly 6 is mounted on the screw of the second driving assembly, and the second driving assembly is also possible to other structures, is not limited herein
It is fixed.
The distance between contactless static detector and plate calibration electrodes 2 are adjustable, can calibrate different model
Contactless static detector, expand the use scope of calibrating installation.
In the present embodiment, the periphery of support frame 1 is additionally provided with protective frame 7, protective frame 7 and 1 integrally connected of support frame, is equipped with
The connection frame 9 of first driving assembly 6 is connect with the side of protective frame 7.Protective frame 7 includes upper and lower first frame 71 disposed in parallel
It with the second frame 72, is connected between the first frame 71 and the second frame 72 by vertical bar, the first frame 71 passes through cross bar and support
The square frame 11 of 1 downside of frame connects, and the height of the second frame 72 setting is higher than plate calibration electrodes 2, can effectively prevent to calibrate
Personnel touch the plate calibration electrodes 2 of electrification, prevent calibration personnel from getting shocked.
It is also connected with ground wire on support frame 1, further avoids calibration personnel during the test and is calibrated close to plate
It when electrode 2, prevents calibration personnel from getting shocked, improves the safety coefficient that calibrating installation uses.
The present embodiment additionally provides a kind of calibration method of contactless static detector, for above-mentioned contactless quiet
In photodetector calibrating installation, comprising the following steps:
Step 1: contactless static detector is installed on the mounting portion 5 of test arm 4, examine contactless electrostatic
Survey the middle part that device is placed in plate calibration electrodes 2.
Step 2: adjusting the measuring distance between contactless static detector and plate calibration electrodes 2.
Specifically, the first driving assembly 6 driving test arm 4 rise or decline, adjust contactless static detector with
Measuring distance between plate calibration electrodes 2 reaches the distance for meeting testing standard.The contactless electrostatic detection of different model
Measuring distance required by device is different.
Step 3: to 2 outputting standard voltage of plate calibration electrodes, with contactless static detector detection plate calibration electricity
The voltage of pole 2 obtains electrostatic potential value.
Specifically, plate calibration electrodes 2 are connected with DC high-voltage power supply 8, and DC high-voltage power supply 8 provides the mark for calibration
Quasi- voltage.After DC high-voltage power supply 8 provides normal voltage to plate calibration electrodes 2, detected with contactless static detector
The voltage of plate calibration electrodes 2 obtains electrostatic potential value by contactless static detector.
Step 4: standard of comparison voltage and electrostatic potential value, obtain calibration error, it is non-according to obtained standard error calibration
Contact-type electrostatic detector.
After obtaining calibration error, DC high-voltage power supply 8 no longer provides DC voltage, plate school to plate calibration electrodes 2
Collimator electrode 2 is in zero potential state, but electrostatic charge is still suffered from insulating fixing piece 3, at this time with contactless electrostatic detection
Whether the voltage that device detects plate calibration electrodes 2 is zero, if it is zero, proves that contactless static detector is working properly,
If be not zero, need to calibrate contactless static detector.
Obviously, the above embodiment of the present invention is just for the sake of clearly illustrating examples made by the present invention, and being not is pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (10)
1. a kind of contactless static detector calibrating installation characterized by comprising
Support frame (1)；
Plate calibration electrodes (2), the plate calibration electrodes (2) are horizontal positioned, and the side of the plate calibration electrodes (2) is set
Have multiple insulating fixing pieces (3), one end of the insulating fixing piece (3) is connect with the plate calibration electrodes (2), the other end with
Support frame as described above (1) connection；
Test arm (4), the test arm (4) are equipped with the mounting portion (5) for installing contactless static detector, and described
Mounting portion (5) is placed in the center above the plate calibration electrodes (2).
2. contactless static detector calibrating installation according to claim 1, which is characterized in that support frame as described above (1)
Including square frame (11) and along the first support (12) being diagonally arranged and second support (13) of the square frame (11), institute
It states support frame (1) and is connected with ground wire.
3. contactless static detector calibrating installation according to claim 2, which is characterized in that the plate calibration electricity
The side of pole (2) is set there are five the insulating fixing piece (3)；
The center of the plate calibration electrodes (2) is connect with one end of the insulating fixing piece (3), the insulating fixing piece (3)
The other end connect with the infall of the first support (12) and the second support (13)；
The plate calibration electrodes (2) are circumferentially uniformly distributed four insulating fixing pieces (3), insulate and fix described in two of them
The central symmetry of the relatively described plate calibration electrodes (2) of part (3) is installed on the first support (12), is insulated described in another two
The central symmetry of the relatively described plate calibration electrodes (2) of fixing piece (3) is installed on the second support (13).
4. contactless static detector calibrating installation according to claim 1, which is characterized in that the insulating fixing piece
It (3) include cylindrical tetrafluoro fixing piece.
5. contactless static detector calibrating installation according to claim 1, which is characterized in that the plate calibration electricity
The material of pole (2) is stainless steel, and the surface of the plate calibration electrodes (2) is in mirror surface.
6. contactless static detector calibrating installation according to claim 1, which is characterized in that the test arm (4)
One end be connected with the first driving assembly (6) for driving the test arm (4) lifting, the other end setting of the test arm (4)
The mounting portion (5).
7. contactless static detector calibrating installation according to claim 6, which is characterized in that first driving group
Part (6) includes motor (61), screw rod and the screw (62) that connection is matched with the screw rod, the output end of the motor (61) and institute
One end connection of screw rod is stated, the test arm (4) connect with the screw (62).
8. contactless static detector calibrating installation according to claim 1, which is characterized in that support frame as described above (1)
Periphery be equipped with protective frame (7), and the protective frame (7) and support frame as described above (1) integrally connected, the height of the protective frame (7)
Degree is higher than the plate calibration electrodes (2).
9. contactless static detector calibrating installation according to claim 1, which is characterized in that the plate calibration electricity
Pole (2) is connected with DC high-voltage power supply (8).
10. a kind of calibration method of contactless static detector, described in any item contactless quiet for claim 1-9
In photodetector calibrating installation, which comprises the following steps:
Contactless static detector is installed on to the mounting portion (5) of test arm (4), sets the contactless static detector
In the middle part of plate calibration electrodes (2)；
Adjust the measuring distance between the contactless static detector and the plate calibration electrodes (2)；
To plate calibration electrodes (2) the outputting standard voltage, the plate school is detected with the contactless static detector
The voltage of collimator electrode (2), obtains electrostatic potential value；
Compare the normal voltage and the electrostatic potential value, obtains calibration error.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910730011.8A CN110308413B (en) | 2019-08-08 | 2019-08-08 | Non-contact type static detector calibration device and calibration method |
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| CN201910730011.8A CN110308413B (en) | 2019-08-08 | 2019-08-08 | Non-contact type static detector calibration device and calibration method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114779147A (en) * | 2022-04-07 | 2022-07-22 | 中国工程物理研究院计量测试中心 | Remote control non-contact type electrostatic voltmeter calibration method |
| CN115248412A (en) * | 2022-04-07 | 2022-10-28 | 中国工程物理研究院计量测试中心 | Calibrating device of remote control non-contact static voltmeter |
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| CN207198314U (en) * | 2017-09-13 | 2018-04-06 | 欧咖莱智能科技（固安）有限公司 | A kind of electrometer calibrating installation |
| CN207611133U (en) * | 2017-12-26 | 2018-07-13 | 山东中检高科检测技术有限公司 | A kind of portable electrostatic voltmeter detection device |
| CN109239434A (en) * | 2018-08-03 | 2019-01-18 | 上海交通大学 | The measuring device of surface potential on-line monitoring |
| CN210514599U (en) * | 2019-08-08 | 2020-05-12 | 上海安平静电科技有限公司 | Non-contact electrostatic detector calibrating device |
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| CN114779147A (en) * | 2022-04-07 | 2022-07-22 | 中国工程物理研究院计量测试中心 | Remote control non-contact type electrostatic voltmeter calibration method |
| CN115248412A (en) * | 2022-04-07 | 2022-10-28 | 中国工程物理研究院计量测试中心 | Calibrating device of remote control non-contact static voltmeter |
| CN114779147B (en) * | 2022-04-07 | 2022-11-22 | 中国工程物理研究院计量测试中心 | Remote control non-contact type electrostatic voltmeter calibration method |
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