CN204044217U - There is the potential difference meter of a temperature compensation dish - Google Patents
There is the potential difference meter of a temperature compensation dish Download PDFInfo
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- CN204044217U CN204044217U CN201420419532.4U CN201420419532U CN204044217U CN 204044217 U CN204044217 U CN 204044217U CN 201420419532 U CN201420419532 U CN 201420419532U CN 204044217 U CN204044217 U CN 204044217U
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- Prior art keywords
- dish
- resistance
- measurement
- contact
- step disc
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Abstract
A kind of potential difference meter having a temperature compensation dish for DC voltage measurement, there are five step discs, after it, four step discs are all coiled by measurement and the replacement dish identical with measurement dish structure forms, four step disc measurement dishes next are connected to each other with the corresponding contact on replacement dish, and it makes potential difference meter inner lead resistance, switch contact resistance and variation, thermoelectrical potential can both be ignored potential difference meter impact.
Description
Technical field
The utility model relates to the instrument measured DC voltage.
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, the large brush of general employing with enlarge active surface, and adopts silver-carbon/carbon-copper composite material; The new method that the potential difference meter solution switch contact resistance that application number 200810121911.4 discloses five step discs is deteriorated, its five step discs are all coiled by measurement and replacement dish forms, not containing bracket panel, each measurement dish and replacement dish there is resistance, measurement dish on its five step discs and replacement dish constitute bridge circuit in circuit, its maximum defect is that error is not independent, once measurement coil certain some indicating value overproof, just cannot to determine which resistance is overproof to cause, this makes troubles to qualification and maintenance.
Utility model content
The purpose of this utility model is a kind of potential difference meter having five step discs of design, and it does not adopt bridge circuit, and such error can be independent, and does not have 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: potential difference meter is from the external working power E positive pole terminal adjustable resistance R through 22 4 Ω resistant series be made up of of range of adjustment between 2.2 ~ 3V
p1, the adjustable resistance R to be made up of 22 0.2 Ω resistant series
p2, and the adjustable resistance R of range of adjustment between 0 ~ 0.22 Ω
p3, through five step discs, set up resistance R to 101.8 Ω
n, then through having the temperature compensation dish W of 18 × 0.05 Ω resistance in seriess to get back to the external working power E negative pole terminal composition potential difference meter performance loop of range of adjustment between 2.2 ~ 3V above, from external saturated standard cell E
npositive pole terminal is connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2resistance R is set up to 101.8 Ω
nagain through having the temperature compensation dish W of 18 × 0.05 Ω resistance in seriess to get back to external saturated standard cell E above
nnegative pole terminal composition potential difference meter standard loop, for connecting measured " U
x" two terminals, positive pole terminal after five measurement dishes, then is connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2to negative pole terminal composition potential difference meter equalizing network, it is characterized in that the first step disc has 0, 1, 2, the measurement dish I of 20 totally 21 gears, measurement dish I welds 0.1 Ω resistance one between every two adjacent contacts, and the second step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish II with have 0, 1, 2, the replacement dish II ' composition of 10 totally 11 gears, the resistance one that resistance is 0.1 Ω is welded between measurement dish II with upper every two adjacent contacts of replacement dish II ', " 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 replacement dish III ' composition of 10 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 replacement dish IV ' composition of 10 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 replacement dish V ' composition of 10 totally 11 gears, each contact in 3rd step disc on measurement dish III and replacement dish III ', each contact in 4th step disc on measurement dish IV and replacement dish IV ', each contact in 5th step disc on measurement dish V and replacement dish V ', be connected with the corresponding contact of replacement dish II ' with measurement dish II in the second step disc, the Metal Contact ring of the second step disc measurement dish II and the Metal Contact interannular of the replacement dish II ' resistance R of 999 Ω
1connect, the Metal Contact ring of the 3rd step disc measurement dish III and the Metal Contact interannular of the replacement dish III ' resistance R of 9999 Ω
2connect, the Metal Contact ring of the 4th step disc measurement dish IV and the Metal Contact interannular of the replacement dish IV ' resistance R of 100K Ω
3connect, the Metal Contact ring of the 5th step disc measurement dish V and the Metal Contact interannular of the replacement dish V ' resistance R of 1000K Ω
4connect, synchronous when the brush on each step disc measurement dish rotates with the brush on replacement dish, " 0 " contact of measurement dish II and node A connect measurement dish I " 0 " contact, and measurement dish I " 20 " contact is through the resistance R of 6 Ω
8adjustable resistance R is connected again after connected node C
p3cold end, another road of node C is through 12 Ω resistance R
6connect double-point double-throw switch K
1middle K
1-1layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-1layer and K
1-2the normally closed contact of layer connects with wire, and " 10 " contact of replacement dish I ' and Node B connect double-point double-throw switch K
1middle K
1-1layer × 1 range contact and K
1-2layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-2layer × 0.1 range contact is through 97.2 Ω resistance R
7with K
1-2layer × 1 range contact connects, then sets up resistance R through 101.8 Ω
nthe temperature compensation dish W of 18 × 0.05 Ω resistance in seriess is had, temperature compensation dish W two ends 0.1 Ω resistance R in parallel above rear connection
9rear connection potential difference meter external working power E negative pole terminal, for connecting measured " U
x" two measure terminals, positive pole terminal is connected with the Metal Contact ring of measurement dish I, and negative pole terminal is connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2be connected with " 10 " contact of measurement dish II afterwards.
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 four dish is consistent, and this brings convenience to debugging and maintenance, also makes potential difference meter structure simple, volume-diminished, thus reduce production cost; When potential difference meter five measurement dish resets, 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, the thermoelectrical potential of rear five several μ V of each branch road of step disc is all connected in the voltage drop in units of lying prostrate, and therefore thermoelectrical potential is to " U
x" two measure terminals impact can ignore.
Accompanying drawing explanation
Accompanying drawing is a kind of schematic circuit of the present utility model.
Embodiment
In the accompanying drawings, the adjustable resistance R of 22 × 4 Ω
p1, represent adjustable resistance R
p1on have 22 resistances to be resistant series of 4 Ω, in like manner, the adjustable resistance R of 22 × 0.2 Ω
p2, represent adjustable resistance R
p2on have 22 resistances to be resistant series of 0.2 Ω, 20 × 0.1 Ω on first step disc measurement dish I represent that measurement dish I has 20 resistances to be resistant series of 0.1 Ω, 10 × 0.1 Ω on second step disc measurement dish II and replacement dish II ', represent and measurement dish II and replacement dish II ' has 10 resistances to be resistant series of 0.1 Ω, in the accompanying drawings, 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 1, in the accompanying drawings, 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 the resistance that electric current flows through the minimizing of replacement dish, vice versa, so, what indicating value no matter rear four step discs put, and this step disc resistance value between node A and Node B is constant, and this can ensure what indicating value no matter rear four step discs put, each step disc resistance ratio is substantially constant, also ensures that the electric current flowing through each step disc is substantially constant.
Potential difference meter standard operation current design becomes 10mA, when × 0.1 range, from node C through 6 Ω resistance R
8, five step discs are 108 Ω to Node B resistance, are connected to double-point double-throw switch K
1middle K
1-2layer × 0.1 range contact time, with 12 Ω resistance R
6parallel connection, 108 Ω resistances are 12 Ω resistance R
69 times of resistance, so flow through 12 Ω resistance R
6electric current be 9mA, the electric current flowing through five step discs is 1mA, with 12 Ω resistance R
6the resistance that circuit reduces is made, by the 97.2 Ω resistance R that connect after parallel connection
7carrying out holding circuit always hinders constant.
When × 1 range, flowing through between node A and Node B is total working electric current 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, and a road is through measurement dish V, then a road is through 112.4986 Ω resistance R
5, five road electric currents meet at Node B.Remove through resistance R
5outside branch road, each branch 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, flowing through each branch current ratio between node A, Node B is: 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, allow flow through measurement dish V, the total current of measurement dish IV, measurement dish III and measurement dish II is 1.111mA, flows through resistance R
5electric current be 8.889mA, then 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 each stepping of the first step disc is 1mV, and each stepping of the second step disc is 0.1mV, and each stepping of the 3rd step disc is 0.01mV, and each stepping of the 4th step disc is 0.001mV, and each stepping of the 5th step disc is 0.0001mV.
When after working current standardization, n thrown by I measurement dish
1, n thrown by II measurement dish
2, n thrown by III measurement dish
3, n thrown by IV measurement dish
4, n thrown by V measurement dish
5, K switch is thrown to the left side, and between two terminals being at this moment positioned at measurement, voltage is:
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＝1n
1+0.1n
2+0.01n
3+0.001n
4+0.0001n
5(mV)
U
X＝1000n
1+100n
2+10n
3+1n
4+0.1n
5(μV)
When × 0.1 range, the electric current flowing through five measurement dishes is reduced to when × 1 range 1/10, so when after working current standardization, n thrown by I measurement dish
1, n thrown by II measurement dish
2, n thrown by III measurement dish
3, n thrown by IV measurement dish
4, n thrown by V measurement dish
5, K switch is thrown to the left side, and between two terminals being at this moment positioned at measurement, voltage is:
U
X＝1×0.1n
1+0.1×0.1n
2+0.01×0.1n
3+0.001×0.1n
4+0.0001×0.1n
5(mV)
U
X＝100n
1+10n
2+1n
3+0.1n
4+0.01n
5(μV)
In standard loop, the electromotive force of saturated standard cell is 1.0186V when room temperature 20 DEG C, environment temperature often raises 1 DEG C, and the electromotive force of saturated standard cell reduces about 40 μ V, determines by the thermometer of 0.1 DEG C of resolution on saturated standard cell the electromotive force that saturated standard cell is instant.
This potential difference meter 1mA electric current flows through temperature compensation dish, and on temperature compensation dish, every stepping 0.05 Ω resistance obtains the temperature compensation of every stepping 50 μ V.
Potential difference meter working power will adopt YJ49 type high stability adjustable stabilized voltage supply, adjustable resistance R
p1, adjustable resistance R
p2, adjustable resistance R
p3for regulating working current, adjustable resistance R
p3the resistance value of whole range of adjustment is greater than adjustable resistance R
p2a step value, adjustable resistance R
p2the resistance value of whole range of adjustment is greater than adjustable resistance R
p1a step value, as long as YJ49 type high stability adjustable stabilized voltage supply output voltage is adjusted between 2.2 ~ 3V, just can conveniently by regulating adjustable resistance R
p1, adjustable resistance R
p2, adjustable resistance R
p3potential difference meter working current is adjusted to standard state.
Claims (1)
1. have a potential difference meter for a temperature compensation dish, potential difference meter is from the external working power E positive pole terminal adjustable resistance R through 22 4 Ω resistant series be made up of of range of adjustment between 2.2 ~ 3V
p1, the adjustable resistance R to be made up of 22 0.2 Ω resistant series
p2, and the adjustable resistance R of range of adjustment between 0 ~ 0.22 Ω
p3, through five step discs, set up resistance R to 101.8 Ω
n, then through having the temperature compensation dish W of 18 × 0.05 Ω resistance in seriess to get back to the external working power E negative pole terminal composition potential difference meter performance loop of range of adjustment between 2.2 ~ 3V above, from external saturated standard cell E
npositive pole terminal is connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2resistance R is set up to 101.8 Ω
nagain through having the temperature compensation dish W of 18 × 0.05 Ω resistance in seriess to get back to external saturated standard cell E above
nnegative pole terminal composition potential difference meter standard loop, for connecting measured " U
x" two terminals, positive pole terminal after five measurement dishes, then is connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2to negative pole terminal composition potential difference meter equalizing network, it is characterized in that the first step disc has 0, 1, 2, the measurement dish I of 20 totally 21 gears, measurement dish I welds 0.1 Ω resistance one between every two adjacent contacts, and the second step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish II with have 0, 1, 2, the replacement dish II ' composition of 10 totally 11 gears, the resistance one that resistance is 0.1 Ω is welded between measurement dish II with upper every two adjacent contacts of replacement dish II ', " 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 replacement dish III ' composition of 10 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 replacement dish IV ' composition of 10 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 replacement dish V ' composition of 10 totally 11 gears, each contact in 3rd step disc on measurement dish III and replacement dish III ', each contact in 4th step disc on measurement dish IV and replacement dish IV ', each contact in 5th step disc on measurement dish V and replacement dish V ', be connected with the corresponding contact of replacement dish II ' with measurement dish II in the second step disc, the Metal Contact ring of the second step disc measurement dish II and the Metal Contact interannular of the replacement dish II ' resistance R of 999 Ω
1connect, the Metal Contact ring of the 3rd step disc measurement dish III and the Metal Contact interannular of the replacement dish III ' resistance R of 9999 Ω
2connect, the Metal Contact ring of the 4th step disc measurement dish IV and the Metal Contact interannular of the replacement dish IV ' resistance R of 100K Ω
3connect, the Metal Contact ring of the 5th step disc measurement dish V and the Metal Contact interannular of the replacement dish V ' resistance R of 1000K Ω
4connect, synchronous when the brush on each step disc measurement dish rotates with the brush on replacement dish, " 0 " contact of measurement dish II and node A connect measurement dish I " 0 " contact, and measurement dish I " 20 " contact is through the resistance R of 6 Ω
8adjustable resistance R is connected again after connected node C
p3cold end, another road of node C is through 12 Ω resistance R
6connect double-point double-throw switch K
1middle K
1-1layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-1layer and K
1-2the normally closed contact of layer connects with wire, and " 10 " contact of replacement dish I ' and Node B connect double-point double-throw switch K
1middle K
1-1layer × 1 range contact and K
1-2layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-2layer × 0.1 range contact is through 97.2 Ω resistance R
7with K
1-2layer × 1 range contact connects, then sets up resistance R through 101.8 Ω
nthe temperature compensation dish W of 18 × 0.05 Ω resistance in seriess is had, temperature compensation dish W two ends 0.1 Ω resistance R in parallel above rear connection
9rear connection potential difference meter external working power E negative pole terminal, for connecting measured " U
x" two measure terminals, positive pole terminal is connected with the Metal Contact ring of measurement dish I, and negative pole terminal is connected with " 10 " contact of measurement dish II after being connected to the double-point double-throw switch K2 of galvanometer G between two normally closed contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420419532.4U CN204044217U (en) | 2014-07-24 | 2014-07-24 | There is the potential difference meter of a temperature compensation dish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420419532.4U CN204044217U (en) | 2014-07-24 | 2014-07-24 | There is the potential difference meter of a temperature compensation dish |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204044217U true CN204044217U (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420419532.4U Expired - Fee Related CN204044217U (en) | 2014-07-24 | 2014-07-24 | There is the potential difference meter of a temperature compensation dish |
Country Status (1)
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|---|---|
| CN (1) | CN204044217U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104111363A (en) * | 2014-07-24 | 2014-10-22 | 富阳兴远仪器仪表经营部 | Potentiometer with temperature compensation table |
-
2014
- 2014-07-24 CN CN201420419532.4U patent/CN204044217U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104111363A (en) * | 2014-07-24 | 2014-10-22 | 富阳兴远仪器仪表经营部 | Potentiometer with temperature compensation table |
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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 |
Granted publication date: 20141224 Termination date: 20160724 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |