CN104101756A - Voltage measuring apparatus with five stepping plates - Google Patents
Voltage measuring apparatus with five stepping plates Download PDFInfo
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- CN104101756A CN104101756A CN201410363529.XA CN201410363529A CN104101756A CN 104101756 A CN104101756 A CN 104101756A CN 201410363529 A CN201410363529 A CN 201410363529A CN 104101756 A CN104101756 A CN 104101756A
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- dish
- resistance
- measurement
- contact
- replacement
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- 238000005259 measurement Methods 0.000 claims description 75
- 239000002184 metal Substances 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 16
- 238000013461 design Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- RRKGBEPNZRCDAP-UHFFFAOYSA-N [C].[Ag] Chemical compound [C].[Ag] RRKGBEPNZRCDAP-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a voltage measuring apparatus with five stepping plates for measuring a direct current voltage. Each of the five stepping plates is composed of a measuring plate and a replacing plate which is structurally identical to the measuring plate, a resistor with 0.1 ohms is welded between each two adjacent contacts of the measuring plates and the replacing plates of three front stepping plates, and contacts on the measuring plates and replacing plates of two rear stepping plates are connected with the corresponding contacts on the measuring plate and the replacing plate of the third stepping plate. By means of the voltage measuring apparatus with five stepping plates, the influence of the lead resistance in the voltage measuring apparatus, the switch contact resistance and variation, and the thermal electromotive force on the voltage measuring apparatus can be neglected.
Description
Technical field
The instrument that the present invention relates to DC voltage to measure.
Background technology
The current pressure measuring instrument for there being five step discs, in the connection between five step discs, telophragma generally adopts switching over, so just produces the variation of contact resistance, brings restriction to resolution.In order to overcome this problem, generally adopt large brush with enlarge active surface, and adopt silver-carbon/carbon-copper composite material; Application number 200810121911.4 discloses the new method that has the pressure measuring instrument of five step discs to solve switch contact resistance variation, its five step discs are all coiled by measurement and replacement dish forms, not containing bracket panel, on each measurement dish and replacement dish, there is resistance, measurement dish and replacement dish on its five step discs have formed bridge circuit in circuit, the defect of its maximum is that error is not independent, once it is overproof that certain some indicating value is coiled in measurement, just cannot determine which resistance is overproof causes, this makes troubles to qualification and maintenance.
Summary of the invention
The object of the invention is to design a kind of pressure measuring instrument that has five step discs, it does not adopt bridge circuit, and error can be independent like this, and there is no resistance between rear two step disc contacts, and this can reduce costs, and reduces instrument volume.
Technical scheme of the present invention is taked like this: from range of adjustment, the anodal terminal of the external working power E between 1～1.5V passes through by 20 adjustable resistance R that 2.5 Ω resistance are in series pressure measuring instrument
p1, by 20 adjustable resistance R that 0.2 Ω resistance is in series
p2, and the adjustable resistance R of range of adjustment between 0～0.3 Ω
p3, through five step discs, to 101.8 Ω set up resistance R
n, then through the adjustable resistance R of 0～0.2 Ω lockable sliding contact
p4get back to the external working power E negative pole terminal composition pressure measuring instrument work loop of range of adjustment between 1～1.5V, from unsaturated standard cell E
npositive pole is set up resistance R through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts to 101.8 Ω
nand the adjustable resistance R of range of adjustment lockable sliding contact between 0～0.2 Ω
p4, then pass through 200K Ω resistance R
0to unsaturated standard cell E
nnegative pole composition pressure measuring instrument standard loop, be used for connecting measured " U
x" two terminals, anodal terminal after five measurement dishes, then through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts to negative pole terminal composition pressure measuring instrument equalizing network, it is characterized in that the first step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish I with have 0, 1, 2, the 10 replacement dish I ' compositions of totally 11 gears, between upper every two adjacent contacts of measurement dish I and replacement dish I ', weld one of 0.1 Ω resistance, the second step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish II with have 0, 1, 2, the 10 replacement dish II ' compositions of totally 11 gears, between upper every two adjacent contacts of measurement dish II and replacement dish II ', weld one of 0.1 Ω resistance, the 3rd step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish III with have 0, 1, 2, the 10 replacement dish III ' compositions of totally 11 gears, between upper every two adjacent contacts of measurement dish III and replacement dish III ', weld one of 0.1 Ω resistance, " 0 " contact of measurement dish III is circuit node A, " 10 " contact of replacement dish III ' is circuit node B, between node A and Node B, pass through 112.49 Ω resistance R
5connect, the 4th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish IV with have 0, 1, 2, the 10 replacement dish IV ' compositions of totally 11 gears, the 5th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish V with have 0, 1, 2, the 10 replacement dish V ' compositions of totally 11 gears, each contact in the 4th step disc on measurement dish IV and replacement dish IV ', each contact in the 5th step disc on measurement dish V and replacement dish V ', be connected with the corresponding contact of replacement dish III ' with measurement dish III in the 3rd step disc, the resistance R of 999 Ω for the 3rd Metal Contact ring of step disc measurement dish III and the Metal Contact interannular of replacement dish III '
1connect the resistance R of 9999 Ω for the 4th Metal Contact ring of step disc measurement dish IV and the Metal Contact interannular of replacement dish IV '
2connect the resistance R of 100K Ω for the 5th Metal Contact ring of step disc measurement dish V and the Metal Contact interannular of replacement dish V '
3connect, when rotating with the brush on replacement dish, brush on each step disc measurement dish synchronizes, " 0 " contact of measurement dish III is " 0 " contact that node A connects measurement dish II, the Metal Contact ring of measurement dish II connects the Metal Contact ring of measurement dish I, " 10 " contact of replacement dish III ' is " 10 " contact that Node B connects replacement dish II ', and the Metal Contact ring of replacement dish II ' is through the resistance R of 7 Ω
6connect the Metal Contact ring of replacement dish I ', " 10 " contact of measurement dish I is by 11 Ω resistance R
4connect " 0 " contact of replacement dish I ', " 10 " contact of replacement dish I ' connects 101.8 Ω and sets up resistance R
nhot end, " 0 " contact of measurement dish I connects adjustable resistance R
p3cold end, for connecting measured " U
x" two measure terminals, anodal terminal is connected with " 0 " contact of measurement dish I, negative pole terminal is through being connected with " 10 " contact of measurement dish III after being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts.
By above technical scheme, first, second, third step disc construction of switch is identical, and resistance is identical, and four, between the 5th step disc contact, all there is no resistance, this gives to produce with maintenance and brings convenience, and also makes pressure measuring instrument simple in structure, volume-diminished, thus production cost reduced.
Brief description of the drawings
Fig. 1 is a kind of schematic circuit of the present invention.
In Fig. 1, the adjustable resistance R of 20 × 2.5 Ω
p1, represent adjustable resistance R
p1on have the series connection of resistance that 20 resistances are 2.5 Ω, in like manner, the adjustable resistance R of 20 × 0.2 Ω
p2, represent adjustable resistance R
p2on have the series connection of resistance that 20 resistances are 0.2 Ω, 10 × 0.1 Ω on the first step disc, the second step disc, the 3rd step disc, represent that measurement dish connects with there being the resistance that 10 resistances are 0.1 Ω on replacement dish,
In Fig. 1, on step disc, thick black line represents Metal Contact ring, and hollow small circle represents hard contact, and four-headed arrow represents metallic brush.
Embodiment
In Fig. 1, the resistance that every stepping is coiled in first, second step disc measurement to be increased equals replacement and coils the resistance that every stepping reduces, thus measurement dish in rotation process, circuit always hinders constant; When in three step discs between node A, Node B, any one step disc rotates, the resistance that electric current flows through measurement dish to be increased equals electric current and flows through the resistance that replacement dish reduces, vice versa, so, what indicating value rear three step discs no matter put, and this step disc resistance value between node A and Node B is constant, and this can ensure rear three step discs no matter put what indicating value, each step disc resistance ratio is substantially constant, also ensures that the electric current of each step disc is substantially constant.
The current design that pressure measuring instrument standard operation electric current flows through between node A, B becomes 1mA, and working current is divided into four tunnels after node A: a road is through measurement dish III, and a road is through measurement dish IV, and a road is through measurement dish V, and Zai Yi road is through 112.5 Ω resistance R
5, four road electric currents meet at Node B.Except process resistance R
5outside branch road, each branch road resistance ratio between node A, Node B: the 5th step disc: the 4th stepping: the 3rd step disc=100: 10: 1, so, except flowing through resistance R
5outside branch road, flow through each branch current ratio between node A, Node B and be: the 5th step disc: the 4th stepping: the 3rd step disc=1st: 10: 100, except resistance R
5outside branch road, between node A, Node B, resistance is approximately 100K Ω/111, allows the total current that flows through measurement dish V, measurement dish IV and measurement dish III be 0.111mA, flows through resistance R
5electric current be 0.889mA, 0.889mA × R
5=100K Ω/111 × 0.111mA, resistance R
5≈ 112.49 Ω.Pressure measuring instrument 1mA working current is through resistance R
5shunting, making to flow through measurement dish V electric current is 0.001mA, and measurement dish IV electric current is 0.01mA, and measurement dish III is 0.1mA; Resistance 100 Ω between node A, B, add 1 Ω and the resistance R of the second step disc
67 Ω, totally 108 Ω, on the first step disc, between two brushes of measurement dish I and replacement dish I ', resistance is 12 Ω, 108 Ω are its nine times, in the time that pressure measuring instrument standard operation current design becomes 10mA, electric current between the first step disc measurement dish I brush and replacement dish I ' brush is 9mA, and 1mA electric current flows through the second step disc and node A, Node B; At this moment the each stepping of the first step disc is 1 × 10
-3mV, the each stepping of the second step disc is 1 × 10-4mV, the each stepping of the 3rd step disc is 1 × 10
-5mV, the each stepping of the 4th step disc is 1 × 10
-6mV, the each stepping of the 5th step disc is 1 × 10
-7mV.
When after working current standardization, I measurement dish is thrown n
1, II measurement dish is thrown n
2, III measurement dish is thrown n
3, IV measurement dish is thrown n
4, V measurement dish is thrown n
5, K switch is thrown to the left side, is at this moment positioned at voltage between two terminals of measurement to be:
U
X＝10×0.1n
1+1×0.1n
2+0.1×0.1n
3+0.01×0.1n
4+0.001×0.1n
5(mV)
U
X＝n
1+0.1n
2+0.01n
3+0.001n
4+0.0001n
5(mV)
Pressure measuring instrument working current 10mA is larger, adopting A-battery is not stablize, working power will adopt the continuously adjustable high stability stabilized voltage supply of YJ49b type 1～1.5V, this pressure measuring instrument adopts larger working current and this smaller resistance of 0.1 Ω, be when measuring small voltage, reduce the requirement to galvanometer sensitivity.
In standard loop, for avoiding loop current excessive, adopt 200K Ω resistance R
0carry out current limliting, because the electromotive force of unsaturated standard cell is discrete, between 1.0188V～1.0196V, standardized working current is 10mA, therefore sets up resistance R
nget 101.8 Ω, the lockable adjustable resistance R of additional 0～0.2 Ω
p4, variation range that can coverage criteria cell emf.
The standard operation electric current of pressure measuring instrument is such acquisition: 1mV standard signal voltage by polarity and pressure measuring instrument " U
x" two measure terminal and connect, the total indicating value of the each step disc of pressure measuring instrument is identical with standard signal magnitude of voltage, double-point double-throw switch K throws to the left side, adjusting adjustable resistance R
p1, adjustable resistance R
p2and adjustable resistance R
p3, make galvanometer G nulling; Again double-point double-throw switch K is thrown to the right, regulate adjustable resistance R
p4, make galvanometer G nulling, then after repeating once, adjustable resistance R
p4locking, at this moment the working current of pressure measuring instrument is with regard to standardization, when instrument uses, first proofreads standard, carry out reading to reading dial time, reading again after check and correction standard.
Claims (1)
1. have a pressure measuring instrument for five step discs, from range of adjustment, the anodal terminal of the external working power E between 1～1.5V passes through by 20 adjustable resistance R that 2.5 Ω resistance are in series pressure measuring instrument
p1, by 20 adjustable resistance R that 0.2 Ω resistance is in series
p2, and the adjustable resistance R of range of adjustment between 0～0.3 Ω
p3, through five step discs, to 101.8 Ω set up resistance R
n, then through the adjustable resistance R of 0～0.2 Ω lockable sliding contact
p4get back to the external working power E negative pole terminal composition pressure measuring instrument work loop of range of adjustment between 1～1.5V, from unsaturated standard cell E
npositive pole is set up resistance R through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts to 101.8 Ω
nand the adjustable resistance R of range of adjustment lockable sliding contact between 0～0.2 Ω
p4, then pass through 200K Ω resistance R
0to unsaturated standard cell E
nnegative pole composition pressure measuring instrument standard loop, be used for connecting measured " U
x" two terminals, anodal terminal after five measurement dishes, then through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts to negative pole terminal composition pressure measuring instrument equalizing network, it is characterized in that the first step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish I with have 0, 1, 2, the 10 replacement dish I ' compositions of totally 11 gears, between upper every two adjacent contacts of measurement dish I and replacement dish I ', weld one of 0.1 Ω resistance, the second step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish II with have 0, 1, 2, the 10 replacement dish II ' compositions of totally 11 gears, between upper every two adjacent contacts of measurement dish II and replacement dish II ', weld one of 0.1 Ω resistance, the 3rd step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish III with have 0, 1, 2, the 10 replacement dish III ' compositions of totally 11 gears, between upper every two adjacent contacts of measurement dish III and replacement dish III ', weld one of 0.1 Ω resistance, " 0 " contact of measurement dish III is circuit node A, " 10 " contact of replacement dish III ' is circuit node B, between node A and Node B, pass through 112.49 Ω resistance R
5connect, the 4th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish IV with have 0, 1, 2, the 10 replacement dish IV ' compositions of totally 11 gears, the 5th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish V with have 0, 1, 2, the 10 replacement dish V ' compositions of totally 11 gears, each contact in the 4th step disc on measurement dish IV and replacement dish IV ', each contact in the 5th step disc on measurement dish V and replacement dish V ', be connected with the corresponding contact of replacement dish III ' with measurement dish III in the 3rd step disc, the resistance R of 999 Ω for the 3rd Metal Contact ring of step disc measurement dish III and the Metal Contact interannular of replacement dish III '
1connect the resistance R of 9999 Ω for the 4th Metal Contact ring of step disc measurement dish IV and the Metal Contact interannular of replacement dish IV '
2connect the resistance R of 100K Ω for the 5th Metal Contact ring of step disc measurement dish V and the Metal Contact interannular of replacement dish V '
3connect, when rotating with the brush on replacement dish, brush on each step disc measurement dish synchronizes, " 0 " contact of measurement dish III is " 0 " contact that node A connects measurement dish II, the Metal Contact ring of measurement dish II connects the Metal Contact ring of measurement dish I, " 10 " contact of replacement dish III ' is " 10 " contact that Node B connects replacement dish II ', and the Metal Contact ring of replacement dish II ' is through the resistance R of 7 Ω
6connect the Metal Contact ring of replacement dish I ', " 10 " contact of measurement dish I is by 11 Ω resistance R
4connect " 0 " contact of replacement dish I ', " 10 " contact of replacement dish I ' connects 101.8 Ω and sets up resistance R
nhot end, " 0 " contact of measurement dish I connects adjustable resistance R
p3cold end, for connecting measured " U
x" two measure terminals, anodal terminal is connected with " 0 " contact of measurement dish I, negative pole terminal is through being connected with " 10 " contact of measurement dish III after being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410363529.XA CN104101756B (en) | 2014-07-24 | 2014-07-24 | Voltage measuring apparatus with five stepping plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410363529.XA CN104101756B (en) | 2014-07-24 | 2014-07-24 | Voltage measuring apparatus with five stepping plates |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104101756A true CN104101756A (en) | 2014-10-15 |
| CN104101756B CN104101756B (en) | 2017-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410363529.XA Active CN104101756B (en) | 2014-07-24 | 2014-07-24 | Voltage measuring apparatus with five stepping plates |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548649A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | Potentiometer with six stepping discs |
| CN105548647A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | Potentiometer with seven stepping discs |
| CN105548648A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | DC potentiometer with seven stepping discs |
| CN106124825A (en) * | 2016-08-17 | 2016-11-16 | 杭州戎密科技有限公司 | There is the potential difference meter of five step discs |
| CN106291042A (en) * | 2016-08-17 | 2017-01-04 | 杭州戎密科技有限公司 | Use the potential difference meter of five step discs |
| CN106353560A (en) * | 2016-08-26 | 2017-01-25 | 杭州戎密科技有限公司 | Voltage measurement instrument provided with five stepping discs |
Citations (5)
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|---|---|---|---|---|
| GB640031A (en) * | 1946-08-24 | 1950-07-12 | Bendix Aviat Corp | Electric measuring circuit |
| CN1793951A (en) * | 2005-12-28 | 2006-06-28 | 骆乃光 | Bimeasuring range direct current potential difference meter using divided branch having four measuring discs |
| CN201576040U (en) * | 2009-12-30 | 2010-09-08 | 方宁妹 | Potential difference meter |
| CN202443049U (en) * | 2011-12-30 | 2012-09-19 | 孙笑声 | Voltage measuring instrument with three measuring ranges |
| CN204065207U (en) * | 2014-07-24 | 2014-12-31 | 袁乐香 | There is the pressure measuring instrument of five step discs |
-
2014
- 2014-07-24 CN CN201410363529.XA patent/CN104101756B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB640031A (en) * | 1946-08-24 | 1950-07-12 | Bendix Aviat Corp | Electric measuring circuit |
| CN1793951A (en) * | 2005-12-28 | 2006-06-28 | 骆乃光 | Bimeasuring range direct current potential difference meter using divided branch having four measuring discs |
| CN201576040U (en) * | 2009-12-30 | 2010-09-08 | 方宁妹 | Potential difference meter |
| CN202443049U (en) * | 2011-12-30 | 2012-09-19 | 孙笑声 | Voltage measuring instrument with three measuring ranges |
| CN204065207U (en) * | 2014-07-24 | 2014-12-31 | 袁乐香 | There is the pressure measuring instrument of five step discs |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548649A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | Potentiometer with six stepping discs |
| CN105548647A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | Potentiometer with seven stepping discs |
| CN105548648A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | DC potentiometer with seven stepping discs |
| CN106124825A (en) * | 2016-08-17 | 2016-11-16 | 杭州戎密科技有限公司 | There is the potential difference meter of five step discs |
| CN106291042A (en) * | 2016-08-17 | 2017-01-04 | 杭州戎密科技有限公司 | Use the potential difference meter of five step discs |
| CN106353560A (en) * | 2016-08-26 | 2017-01-25 | 杭州戎密科技有限公司 | Voltage measurement instrument provided with five stepping discs |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104101756B (en) | 2017-03-22 |
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Effective date of registration: 20191210 Address after: 314000 west half of the ground floor, building 3, east area, Haiyan science and Technology Venture Park, No.211, Yanbei Road, Wuyuan street, Haiyan County, Jiaxing City, Zhejiang Province Patentee after: Zhejiang Wenshan Electric Technology Co., Ltd Address before: Xikang Road, Gulou District of Nanjing city of Jiangsu Province, No. 1 210024 Patentee before: Gai Nannan |
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Effective date of registration: 20201104 Address after: Jiangdong Road, Shuichang Road, Gulou District, Nanjing City, Jiangsu Province, 210000 Patentee after: Li Wenkang Address before: 314000 west half of the ground floor, building 3, east area, Haiyan science and Technology Venture Park, No.211, Yanbei Road, Wuyuan street, Haiyan County, Jiaxing City, Zhejiang Province Patentee before: Zhejiang Wenshan Electric Technology Co.,Ltd. |
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