CN204008797U - There is the potential difference meter of five step discs - Google Patents
There is the potential difference meter of five step discs Download PDFInfo
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- CN204008797U CN204008797U CN201420419380.8U CN201420419380U CN204008797U CN 204008797 U CN204008797 U CN 204008797U CN 201420419380 U CN201420419380 U CN 201420419380U CN 204008797 U CN204008797 U CN 204008797U
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- dish
- resistance
- measurement
- contact
- step disc
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Abstract
A kind of potential difference meter that has five step discs for DC voltage measurement, wherein its four step discs below are all coiled with the replacement dish identical with measurement dish structure and are formed by measurement, four step disc measurement dishes next are connected to each other on rear three step discs and all there is no resistance with the corresponding contact on replacement dish, and it makes potential difference meter inner lead resistance, switch contact resistance and variation, thermoelectrical potential that potential difference meter is affected and can both be ignored.
Description
Technical field
The utility model relates to the instrument that DC voltage is measured.
Background technology
The current potential difference meter 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 potential difference meter 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.
Utility model content
The purpose of this utility model is a kind of potential difference meter that has five step discs of design, and it does not adopt bridge circuit, and error can be independent like this, and there is no resistance between rear three step disc contacts, and this can reduce costs, and reduces instrument volume.
The technical solution of the utility model is taked like this: from range of adjustment, the anodal terminal of the external working power E between 2～2.8V passes through by 21 adjustable resistance R that 4 Ω resistance are in series potential difference meter
p1, by 21 adjustable resistance R that 0.2 Ω resistance is in series
p2, and the adjustable resistance R of range of adjustment between 0～0.22 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 potential difference meter work loop of range of adjustment between 2～2.8V, 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 potential difference meter 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 potential difference meter equalizing network, it is characterized in that the first step disc is to have 0, 1, 2, the 20 measurement dish I of totally 21 gears, weld one of 0.01 Ω resistance between upper every two adjacent contacts of measurement dish I, and 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 resistance and be one of the resistance of 0.01 Ω, " 0 " contact of measurement dish II is circuit node A, " 10 " contact of replacement dish II ' is circuit node B, and 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, 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 3rd step disc on measurement dish III and replacement dish III ', 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 the resistance R of 999.9 Ω for the second Metal Contact ring of step disc measurement dish II and the Metal Contact interannular of replacement dish II ' with the corresponding contact of replacement dish II ' with measurement dish II in the second step disc
1connect the resistance R of 9999.9 Ω for the 3rd Metal Contact ring of step disc measurement dish III and the Metal Contact interannular of replacement dish III '
2connect the resistance R of 100K Ω for the 4th Metal Contact ring of step disc measurement dish IV and the Metal Contact interannular of replacement dish IV '
3connect the resistance R of 1000K Ω for the 5th Metal Contact ring of step disc measurement dish V and the Metal Contact interannular of replacement dish V '
4connect, when the brush on each step disc measurement dish rotates with the brush on replacement dish, synchronize, " 0 " contact of measurement dish II is that node A connects measurement dish I " 0 " contact, and measurement dish I " 20 " contact connects adjustable resistance R
p3cold end, " 10 " contact of replacement dish II ' be Node B connect set up resistance R
nhot end, between node A and Node B by 112.4986 Ω resistance R
5connect, for connecting measured " U
x" two measure terminals, anodal terminal is connected with the Metal Contact ring of measurement dish I, negative pole terminal is through being connected with " 10 " contact of measurement dish II after being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts.
By above technical scheme, between the 3rd, the 4th, the 5th step disc contact, all there is no resistance, and five step disc errors are independent, the error of the identical stepping of rear three dish is consistent, and this brings convenience to debugging and maintenance, also makes potential difference meter simple in structure, volume-diminished, thus production cost reduced; In the time of five measurement dish resets of potential difference meter, the internal wiring combined potential of potential difference meter is A point current potential, some current potentials are " 0 ", so the zero potential of this potential difference meter is very little, it is that in the voltage drop of unit, therefore thermoelectrical potential is to " U that the thermoelectrical potential of five several μ V of each branch road of step disc is all connected on to lie prostrate
x" two measure terminals impacts and can ignore.
Brief description of the drawings
Fig. 1 is a kind of schematic circuit of the present utility model.
In Fig. 1, the adjustable resistance R of 21 × 4 Ω
p1, represent adjustable resistance R
p1on have the series connection of resistance that 21 resistances are 4 Ω, in like manner, the adjustable resistance R of 21 × 0.2 Ω
p2, represent adjustable resistance R
p2on have the series connection of resistance that 21 resistances are 0.2 Ω, 20 × 0.01 Ω on the first step disc measurement dish I represent that measurement dish I has the resistance series connection that 20 resistances are 0.01 Ω,
10 × 0.01 Ω on the second step disc measurement dish II and replacement dish II ', represent that measurement dish II has the resistance that 10 resistances are 0.01 Ω to connect with on replacement dish II ',
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
Embodiment 1, in Fig. 1, when in rear four 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 four step discs no matter put, and this step disc resistance value between node A and Node B is constant, and this can ensure rear four 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.
Potential difference meter standard operation current design becomes 10mA, potential difference meter 10mA working current is divided into five tunnels after node A: a road is through measurement dish II, and a road is through measurement dish III, and a road is through measurement dish IV, one tunnel is through measurement dish V, and Zai Yi road is through 112.5 Ω resistance R
5, five 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: the second step disc=1000: 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: the second step disc=1: 10: 100: 1000, except resistance R
5outside branch road, between node A, Node B, resistance is 1000K Ω/1111, allows the total current that flows through measurement dish V, measurement dish IV, measurement dish III and measurement dish II be 1.111mA, flows through resistance R
5electric current be 8.889mA, 8.889mA × R
5=1000K Ω/1111 × 1.111mA, resistance R
5≈ 112.4986 Ω.Potential difference meter 10mA 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, and measurement dish II electric current is 1mA; At this moment the each stepping of the first step disc is 1 × 10
-4mV, the each stepping of the second step disc is 1 × 10
-5mV, the each stepping of the 3rd step disc is 1 × 10
-6mV, the each stepping of the 4th step disc is 1 × 10
-7mV, the each stepping of the 5th step disc is 1 × 10
-8mV.
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 × 0.01n
1+ 1 × 0.01n
2+ 0.1 × 0.01n
3+ 0.01 × 0.01n
4+ 0.001 × 0.01n
5(mV) U
x=100n
1+ 10n
2+ 1n
3+ 0.1n
4+ 0.01n
5(μ V)
Potential difference meter working power will adopt YJ49 type high stability adjustable stabilized voltage supply, working current 10mA is larger, adopting A-battery is what not stablize, this potential difference meter adopts larger working current and this smaller resistance of 0.01 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 potential difference meter is such acquisition: 2mV standard signal voltage by polarity and potential difference meter " U
x" two measure terminal and connect, the total indicating value of the each step disc of potential difference meter 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 potential difference meter 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 potential difference meter for five step discs, from range of adjustment, the anodal terminal of the external working power E between 2～2.8V passes through by 21 adjustable resistance R that 4 Ω resistance are in series potential difference meter
p1, by 21 adjustable resistance R that 0.2 Ω resistance is in series
p2, and the adjustable resistance R of range of adjustment between 0～0.22 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 potential difference meter work loop of range of adjustment between 2～2.8V, 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 potential difference meter 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 potential difference meter equalizing network, it is characterized in that the first step disc is to have 0, 1, 2, the 20 measurement dish I of totally 21 gears, weld one of 0.01 Ω resistance between upper every two adjacent contacts of measurement dish I, and 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 resistance and be one of the resistance of 0.01 Ω, " 0 " contact of measurement dish II is circuit node A, " 10 " contact of replacement dish II ' is circuit node B, and 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, 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 3rd step disc on measurement dish III and replacement dish III ', 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 the resistance R of 999.9 Ω for the second Metal Contact ring of step disc measurement dish II and the Metal Contact interannular of replacement dish II ' with the corresponding contact of replacement dish II ' with measurement dish II in the second step disc
1connect the resistance R of 9999.9 Ω for the 3rd Metal Contact ring of step disc measurement dish III and the Metal Contact interannular of replacement dish III '
2connect the resistance R of 100K Ω for the 4th Metal Contact ring of step disc measurement dish IV and the Metal Contact interannular of replacement dish IV '
3connect the resistance R of 1000K Ω for the 5th Metal Contact ring of step disc measurement dish V and the Metal Contact interannular of replacement dish V '
4connect, when the brush on each step disc measurement dish rotates with the brush on replacement dish, synchronize, " 0 " contact of measurement dish II is that node A connects measurement dish I " 0 " contact, and measurement dish I " 20 " contact connects adjustable resistance R
p3cold end, " 10 " contact of replacement dish II ' be Node B connect set up resistance R
nhot end, between node A and Node B by 112.4986 Ω resistance R
5connect, for connecting measured " U
x" two measure terminals, anodal terminal is connected with the Metal Contact ring of measurement dish I, negative pole terminal is through being connected with " 10 " contact of measurement dish II 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 |
|---|---|---|---|
| CN201420419380.8U CN204008797U (en) | 2014-07-24 | 2014-07-24 | There is the potential difference meter of five step discs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420419380.8U CN204008797U (en) | 2014-07-24 | 2014-07-24 | There is the potential difference meter of five step discs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204008797U true CN204008797U (en) | 2014-12-10 |
Family
ID=52048776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420419380.8U Expired - Fee Related CN204008797U (en) | 2014-07-24 | 2014-07-24 | There is the potential difference meter of five step discs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204008797U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101759A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Potentiometer with five stepping plates |
| 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 |
| CN106353555A (en) * | 2016-08-17 | 2017-01-25 | 杭州戎密科技有限公司 | Potentiometer using six step dials |
| CN106405190A (en) * | 2016-08-17 | 2017-02-15 | 杭州戎密科技有限公司 | A potential difference meter having six stepping panels |
-
2014
- 2014-07-24 CN CN201420419380.8U patent/CN204008797U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101759A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Potentiometer with five stepping plates |
| CN104101759B (en) * | 2014-07-24 | 2017-02-01 | 富阳兴远仪器仪表经营部 | Potentiometer with five stepping plates |
| 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 |
| CN106353555A (en) * | 2016-08-17 | 2017-01-25 | 杭州戎密科技有限公司 | Potentiometer using six step dials |
| CN106405190A (en) * | 2016-08-17 | 2017-02-15 | 杭州戎密科技有限公司 | A potential difference meter having six stepping panels |
| 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 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20160724 |