CN2681149Y - Precision multiple valued inductance standard - Google Patents
Precision multiple valued inductance standard Download PDFInfo
- Publication number
- CN2681149Y CN2681149Y CN 03279632 CN03279632U CN2681149Y CN 2681149 Y CN2681149 Y CN 2681149Y CN 03279632 CN03279632 CN 03279632 CN 03279632 U CN03279632 U CN 03279632U CN 2681149 Y CN2681149 Y CN 2681149Y
- Authority
- CN
- China
- Prior art keywords
- inductance
- lead
- box
- precision
- standards
- 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
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The utility model relates to a precision multiple-value electric inductance standard device which is a main standard device that is used for checking and calibrating LCR measuring instruments, and belongs to the technical field of measurement. An electric inductance standard coil is an annular structure and is provided with more than two electric inductance value lead-out lines and a closed magnetic path is formed between the lead-out lines. The linear expansion coefficient alpha r of a conductive line is smaller than 10<-5>, and the linear expansion coefficient alpha R of framework materials and the linear expansion coefficient alpha r of the conductive line satisfy the following formula: alpha R =(1. 5-2. 5) alpha r. The precision multiple-value electric inductance standard device adopts the unique temperature compensation technique and the annular structure to carry out the electromagnetic shielding; meanwhile, the precision multiple-value electric inductance standard device adopts double-layer sealing and elastic contact, and solves the problem of environment temperature influence, electromagnetic interference, moisture proof and shock proof. The temperature compensation technique of the annular electric inductor of the utility model provides theory criterion for reducing the temperature coefficient of the annular electric inductor, and solves the technical problems that the temperature coefficient of the annular electric inductor is large, which puzzles people for a long time. The precision multiple-value inductance standard device improves the reliability annular electric inductor, and the influence of the environment temperature can be ignored.
Description
Technical field
The utility model relates to the many-valued inductance standards of a kind of precision, is one of main standard device that detects by calibration LCR measuring instrument, belongs to field of measuring techniques.
Background technology
At present the annular standard inductor of external development and production (the GR1482 standard inductor of producing as U.S. GR company) only is single nominal value, does not also have the high precision standard inductance box, and temperature coefficient big (± 3 * 10
-5/ ℃); The DGX-1 inductance box temperature coefficient of domestic development is bigger, and is identical with GR1482, and its inductance value is subjected to the influence of variation of ambient temperature bigger, is not suitable for doing the bigger on-the-spot standard of environmental temperature fluctuation, also is not suitable for making standard in the relatively poor laboratory of temperature control condition.
The utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art part, provide a kind of temperature coefficient little, anti-electromagnetic interference capability is strong, and humidity resistance is good, be subjected to the accurate many-valued inductance box of environmental influence hardly, satisfy the requirement of each metering, scientific research and the detection/calibration LCR of production division measuring instrument.
Technical solution of the present utility model is:
The many-valued inductance standards of a kind of precision, the inductance standards coil is a loop configuration, and two above inductance value extension lines are arranged, and forms the magnetic circuit closure between the extension line; The linear expansion coefficient α of lead
rLess than 10
-5, the linear expansion coefficient α of framework material
RLinear expansion coefficient α with lead
rBetween satisfy following formula:
α
R＝(1.5～2.5)α
r
The many-valued inductance standards of a kind of precision, be that the many-valued inductance standards coil of precision is fixed in the epoxy resin bonded fiber box with silicon rubber, whole epoxy resin bonded fiber box recycle silicon rubber is fixed in the aluminium box, and with foam-filled in the gap of epoxy resin bonded fiber box and aluminium box, be fixed, the filling material made from pitch and paraffin covers whole epoxy resin bonded fiber box then, makes it and air insulated, with lead the inductance value extension line is received switch again.
The utility model has adopted unique technique for temperature compensation and loop configuration, and carries out electromagnetic screen, adopts double-layer seal and Elastic Contact simultaneously, has solved the problem of ambient temperature effect, electromagnetic interference (EMI), protection against the tide and vibrationproof.
The technique for temperature compensation of toroidal inductor of the present utility model provides theoretical foundation for reducing its temperature coefficient, solved big these the long-term puzzlement people's of toroidal inductor temperature coefficient technical barrier, improved the reliability of toroidal inductor widely, the influence of environment temperature can be ignored.
Description of drawings
Fig. 1 is accurate many-valued inductance standards coil synoptic diagram.
Fig. 2 is accurate many-valued inductance standards lead-out wires of coil synoptic diagram.
Fig. 3 is accurate many-valued inductance standards structural representation.
Among the figure: 0,1,2,3,4,5,6,7,8,9,10. inductance value extension line, 31. aluminium box covers, 32. filling materials, 33. epoxy resin bonded fiber boxes, 34. the inductance value extension line, 35. epoxy glass fabric frameworks, 36. foams, 37. toroidal inductor, 38. silicon rubber, 39. aluminium boxes.
The concrete embodiment of implementing:
The structure of inductance standards adopts annular, and its advantage is that leakage field is few, be easy to shielding, so anti-electromagnetic interference capability is strong, and measurement result is reliable and stable, and the shortcoming of toroidal inductor is that processing technology is complicated, and temperature coefficient is bigger than normal, is ± 3 * 10
-5/ ℃, approximately be 10 times of solenoid type inductor.Below mainly analyze the technique for temperature compensation of toroidal inductor from principle.
Xsect for the circle toroidal inductor as shown in Figure 1.By theoretical analysis as can be known, the temperature coefficient of inductor is:
α＝2.08α
r-1.08α
R (1)
In the formula:
α
r-coil can be considered the linear expansion coefficient of lead along the temperature line expansion coefficient of r direction;
α
R-coil can be considered the linear expansion coefficient of framework material along the temperature line expansion coefficient of R direction; Make α in the formula (1)=0, just obtaining temperature coefficient is zero condition
α
R＝1.92α
r (2)
By formula (2) as can be known, as the linear expansion coefficient α of framework material
RLinear expansion coefficient α for lead
r1.92 times the time, the temperature coefficient of toroidal inductor is zero.The temperature coefficient of toroidal inductor can be reduced to zero in theory, but in fact not accomplish, because be difficult to choose the material that linear expansion coefficient just satisfies the following formula relation.As long as the linear expansion coefficient of framework material and lead satisfies following formula substantially, at α
RBe α
r(1.5～2.5) doubly between, and the linear expansion coefficient of lead itself is 10
-5Below the order of magnitude, can realize that all the temperature coefficient of inductor is 10
-6Below the order of magnitude.Select brass (α as lead
r=1.85 * 10
-5/ ℃) or copper (α
r=1.85 * 10
-5/ ℃) or controlled expansion alloy 4J58 (α
r=1.207 * 10
-5/ ℃), framework material is selected nonmagnetic substance epoxy resin bonded fiber (α
R=2.9 * 10
-5/ ℃).In the present embodiment, lead is selected the copper wire envelope curve, and framework material is selected nonmagnetic substance epoxy resin bonded fiber (α
R=2.9 * 10
-5/ ℃), with α
r=1.65 * 10
-5/ ℃ and α
R=2.9 * 10
-5In/℃ substitution the formula (1), the temperature coefficient of toroidal inductor is:
α＝2.08×1.65×10
-5/℃-1.08×2.9×10
-5/℃
＝3.0×10
-6/℃
This temperature coefficient only is present domestic and international annular standard inductor temperature coefficient (3.0 * 10
-5/ ℃) 1/10th.
According to theoretical analysis, measured the temperature coefficient of 0.9mH, 9mH, 90mH three inductors respectively with the utility model, measurement data sees Table 1:
The accurate decade type induction box temperature coefficient of table 1 measurement result
| Temperature (℃) | 0 | 10 | 20 | 30 |
| Inductance value (mH) | 0.89989 | 0.89992 | 0.89994 | 0.89996 |
| 8.9996 | 8.9999 | 9.0002 | 9.0004 | |
| 90.016 | 90.019 | 90.021 | 90.024 |
Formula by experimental data accounting temperature coefficient is:
In the formula: n is for measuring ordinal number, and in this was measured, n was 4 to the maximum, and therefore the temperature coefficient of actual measurement is
α
9mH＝3.0×10
-6/℃
α
90mH＝3.0×10
-6/℃
The inductor coil extension line as shown in Figure 2, inductor coil has two above inductance value extension lines, different extension line number forms the inductance value of varying number, forms the magnetic circuit closure between the extension line, each magnetic circuit closure obtains an inductance value.Both can only draw an inductance value, be made into the monodrome inductance standards; Also can draw a plurality of inductance value, be made into many-valued inductance standards; Also many-valued inductor series connection can be made into multiple range inductance box.Present embodiment has 11 inductance value extension lines, makes inductance value extension line 0 and 1,0 and 2 ..., the magnetic circuit closure between 0 and 10 obtains 10 inductance value.
The accurate many-valued inductance standards made from above-mentioned inductance standards coil as shown in Figure 3, the toroidal inductor 37 usefulness silicon rubber 38 that are wound on the epoxy glass fabric framework 35 are fixed in the epoxy resin bonded fiber box 33, whole epoxy resin bonded fiber box recycle silicon rubber is fixed in the aluminium box 39, and be filled in foam 36 in the gap of epoxy resin bonded fiber box and aluminium box, be fixed, the filling material made from pitch and paraffin 32 covers whole epoxy resin bonded fiber box then, make it and air insulated, with lead inductance value extension line 34 is received switch again.
Claims (4)
1, the many-valued inductance standards of a kind of precision is characterized in that the inductance standards coil is a loop configuration, and two above inductance value extension lines are arranged, and forms the magnetic circuit closure between the extension line; The linear expansion coefficient α of lead
rLess than 10
-5, the linear expansion coefficient α of framework material
RLinear expansion coefficient α with lead
rBetween satisfy following formula:
α
R＝(1.5～2.5)α
r。
2, the many-valued inductance standards of precision according to claim 1, the framework material that it is characterized in that the inductance standards coil is an epoxy resin bonded fiber, lead is selected from a kind of in brass lead, copper conductor or the controlled expansion alloy.
3, the many-valued inductance standards of a kind of precision, it is characterized in that the many-valued inductance standards coil of precision is fixed in the epoxy resin bonded fiber box with silicon rubber, whole epoxy resin bonded fiber box recycle silicon rubber is fixed in the aluminium box, and with foam-filled in the gap of epoxy resin bonded fiber box and aluminium box, be fixed, the filling material made from pitch and paraffin covers whole epoxy resin bonded fiber box then, makes it and air insulated, with lead the inductance value extension line is received switch again.
4, a kind of accurate multirange inductance box is characterized in that this inductance box is composed in series by many many-valued inductance standards of precision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03279632 CN2681149Y (en) | 2003-09-15 | 2003-09-15 | Precision multiple valued inductance standard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03279632 CN2681149Y (en) | 2003-09-15 | 2003-09-15 | Precision multiple valued inductance standard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2681149Y true CN2681149Y (en) | 2005-02-23 |
Family
ID=34599006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03279632 Expired - Fee Related CN2681149Y (en) | 2003-09-15 | 2003-09-15 | Precision multiple valued inductance standard |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2681149Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604959A (en) * | 2013-12-10 | 2014-02-26 | 成都开谱电子科技有限公司 | Standard inductance box |
| CN108387859A (en) * | 2018-05-02 | 2018-08-10 | 广州赛宝计量检测中心服务有限公司 | Measurement and calibration fictitious load, measurement and calibration instrument and the measurement and calibration system |
-
2003
- 2003-09-15 CN CN 03279632 patent/CN2681149Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103604959A (en) * | 2013-12-10 | 2014-02-26 | 成都开谱电子科技有限公司 | Standard inductance box |
| CN103604959B (en) * | 2013-12-10 | 2016-08-24 | 成都开谱电子科技有限公司 | Standard inductance box |
| CN108387859A (en) * | 2018-05-02 | 2018-08-10 | 广州赛宝计量检测中心服务有限公司 | Measurement and calibration fictitious load, measurement and calibration instrument and the measurement and calibration system |
| CN108387859B (en) * | 2018-05-02 | 2023-11-21 | 广州赛宝计量检测中心服务有限公司 | Analog load for metering calibration, metering calibration instrument and metering calibration system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206804718U (en) | Solid compound inslation shield type voltage transformer based on coaxial capacitance | |
| CN102162839B (en) | Three-dimensional pulsed magnetic field wave reconstruction method and three-dimensional magnetic field sensor | |
| CN2574061Y (en) | High voltage capacitance divider | |
| CN1912638A (en) | Can type capacitor voltage mutual inductor | |
| Ren et al. | Research on charge accumulation characteristics by PEA method and Q (t) method | |
| CN1658344A (en) | Low-power electronic current mutual inductor | |
| CN200968968Y (en) | Can-type capacitance type potential transformer | |
| CN2681149Y (en) | Precision multiple valued inductance standard | |
| CN111856354A (en) | Magnetic sensor with wide range and high sensitivity, and preparation method and use method thereof | |
| CN201853571U (en) | Voltage transformer based on capacitance-resistance voltage division principle | |
| CN108155015A (en) | A kind of NPO high voltage ceramic capacitors with dual redundant, small tolerance | |
| US20140159744A1 (en) | Electrical device | |
| CN1570655A (en) | Double detection type current sensor | |
| CN203630174U (en) | High precision capacitive voltage divider applied in live-line verification | |
| CN201489071U (en) | Leakage current resistance sampling sensor for high voltage capacitive equipment | |
| CN2670951Y (en) | Current sensor | |
| CN201956187U (en) | Electronic type voltage transformer | |
| Huang et al. | Polymer Composites for Electrical Engineering | |
| CN201434883Y (en) | Rogowski coil electric quantity transducer | |
| CN2786755Y (en) | Hollow core coils | |
| CN207852480U (en) | A kind of NPO high voltage ceramic capacitors with dual redundant, small tolerance | |
| CN204065202U (en) | A kind of Novel pillar formula voltage transformer (VT) based on coaxial small capacitances Multilevel partial-pressure technology | |
| CN2689240Y (en) | Double detecting current sensors | |
| Yu et al. | Study on partial discharge characteristics of typical defects of oil-paper capacitor bushing | |
| Yang et al. | Influence of temperature on the transmission performance of track circuit in high-speed railway |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050223 Termination date: 20120915 |