CN204044220U - Small voltage measurement mechanism - Google Patents
Small voltage measurement mechanism Download PDFInfo
- Publication number
- CN204044220U CN204044220U CN201420419585.6U CN201420419585U CN204044220U CN 204044220 U CN204044220 U CN 204044220U CN 201420419585 U CN201420419585 U CN 201420419585U CN 204044220 U CN204044220 U CN 204044220U
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- Prior art keywords
- dish
- resistance
- measurement
- contact
- step disc
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Abstract
A kind of small voltage measurement mechanism for DC voltage measurement, its each step disc is coiled by measurement and the replacement dish identical with measurement dish structure forms, on its first step disc measurement dish and replacement dish contact between be welded with resistance, all the other step discs all do not have resistance, it make small voltage measurement mechanism inner lead resistance, switch contact resistance and variation, thermoelectrical potential on small voltage measurement mechanism impact can both ignore.
Description
Technical field
The utility model relates to the instrument measured DC voltage.
Background technology
The current small voltage measurement mechanism 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 small voltage measurement mechanism 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 small voltage measurement mechanism 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: small voltage measurement mechanism is from the external working power E positive pole terminal adjustable resistance R through 21 5 Ω resistant series be made up of of range of adjustment between 11.2 ~ 12V
p1, the adjustable resistance R to be made up of 21 0.25 Ω resistant series
p2, and the adjustable resistance R of range of adjustment between 0 ~ 0.27 Ω
p3, again through five step discs, to temperature compensation dish w
1, 1018 Ω set up resistance R
n, temperature compensation dish w
2get back to the external working power E negative pole terminal composition small voltage measurement mechanism performance loop of small voltage measurement mechanism range of adjustment between 11.2 ~ 12V, from external saturated standard cell E
npositive pole terminal is connected to the double-point double-throw switch K of galvanometer G to arriving temperature compensation dish w between two normally closed contacts
1, 1018 Ω set up resistance R
n, temperature compensation dish w
2to external saturated standard cell E
nnegative pole terminal composition small voltage measurement mechanism standard loop, for connecting measured " U
x" two terminals, positive pole terminal is after five measurement dishes, then the double-point double-throw switch K being connected to galvanometer G between two normally closed contacts is to negative pole terminal composition small voltage measurement mechanism equalizing network, it is characterized in that the first temperature compensation dish W
1have 0,1,2 ... 10 totally 11 gears, connect the resistance one that resistance is 0.1 Ω, the second temperature compensation dish W between each shelves contact
2have 0,1,2 ... 10 totally 16 gears, connect the resistance one that resistance is 0.01 Ω, compensating disc W between each shelves contact
1" 10 " contact and 100.7972 Ω resistance R
8one end sys node D, compensating disc W
2" 16 " contact and 100.7972 Ω resistance R
8other end sys node E, compensating disc W
1" 0 " contact and compensating disc W
2" 0 " contact set up resistance R by 1018 Ω
nconnect, first step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish I with have 0, 1, 2, the replacement dish I ' composition of 10 totally 11 gears, the resistance one that resistance is 0.01 Ω is connected between measurement dish I with each shelves contact of replacement dish I ', " 0 " contact of measurement dish I is circuit node A, and " 10 " contact of replacement dish I ' is circuit node B, 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 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 second step disc on measurement dish II and replacement dish II ', 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 I ' with measurement dish I in the first step disc, the Metal Contact ring of the first step disc measurement dish I and the Metal Contact interannular of the replacement dish I ' resistance R of 999.9 Ω
1connect, 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 10K Ω
2connect, 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 100K Ω
3connect, 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 1M Ω
4connect, 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 10M Ω
5connect, synchronous when the brush on each step disc measurement dish rotates with the brush on replacement dish, " 0 " contact of measurement dish I and node A connect adjustable resistance R
p3cold end, " 10 " contact of replacement dish I ' and Node B connected node D, node E connects external working power E negative pole terminal, for connecting measured " U
x" two measure terminals, positive pole terminal is connected with " 0 " contact of measurement dish I, and negative pole terminal is connected with " 10 " contact of measurement dish I after being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts.
By above technical scheme, second, third, the 4th, all there is no resistance between the 5th step disc contact, five step disc errors are independent, and five step disc errors are consistent, this brings convenience to debugging and maintenance, also make small voltage measurement mechanism structure simple, volume-diminished, thus reduce production cost; When five the measurement dish resets of small voltage measurement mechanism, the internal wiring combined potential of small voltage measurement mechanism is A point current potential, some current potentials are " 0 ", so the zero potential of this small voltage measurement mechanism is very little, the thermoelectrical potential of 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 21 × 5 Ω
p1, represent adjustable resistance R
p1on have 21 resistances to be resistant series of 5 Ω, in like manner, the adjustable resistance R of 21 × 0.25 Ω
p2, represent adjustable resistance R
p2on have 21 resistances to be resistant series of 0.25 Ω, 10 × 0.1 Ω on the first step disc measurement dish I and replacement dish I ', represent and measurement dish I and replacement dish I ' have 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.
In the accompanying drawings, when between node A, Node B, in five step discs, 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 five step discs put, this step disc resistance value between node A and Node B is constant, this can ensure what indicating value no matter five step discs put, and each step disc resistance ratio is substantially constant, also ensures that the electric current flowing through each step disc is substantially constant.
Each step disc resistance ratio: the first step disc: the second step disc: the 3rd step disc: the 4th step disc: the 5th step disc=1: 10: 10
2: 10
3: 10
4, so, flow through each step disc electric current ratio: the first step disc: the second step disc: the 3rd step disc: the 4th step disc: the 5th step disc=10
4: 10
3: 10
2: 10: 1.Small voltage measurement mechanism standard operation current design becomes 11.111mA, then standard operation electric current flows through the first step disc 10mA, flows through the second step disc 1mA, flow through the 3rd step disc 0.1mA, flowing through the 4th step disc is 0.01mA, and flowing through the 5th step disc is 0.001mA
At this moment each stepping of the first step disc is 1mV, and each stepping of the second step disc is 1 × 10
-1mV, each stepping of the 3rd step disc is 1 × 10
-2mV, each stepping of the 4th step disc is 1 × 10
-3mV, each stepping of the 5th step disc is 1 × 10
-4mV, the resistance of the first step disc between node A, B is 1000 Ω, and the switch contact resistance of measurement dish and replacement dish is deteriorated and is generally less than 2 × 10
-4Ω, is deteriorated and causes error to ignore, the second step disc three step discs backward, and the resistance that measurement dish Metal Contact ring is connected with the Metal Contact interannular of replacement dish is larger, and the impact that switch contact resistance is deteriorated more can be ignored.
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
4(mv)
U
X＝1n
1+0.1n
2+0.01n
3+0.001n
4+0.0001n
5(mv)
This small voltage measurement mechanism adopts larger working current and this smaller resistance of 0.01 Ω, when being to measure small voltage, reduces the requirement to current detector sensitivity.
In standard loop, the electromotive force of saturated standard cell is 1.0186V 20 DEG C time, environment temperature often raises 1 DEG C, the electromotive force of saturated standard cell reduces about 40 μ V, according to 0.1 DEG C of resolution thermometer on saturated standard cell, the electromotive force of saturated standard cell can be determined, this small voltage measurement mechanism temperature compensation dish w of every stepping 100 μ V
1comparatively large compensation is carried out to temperature, with the temperature compensation dish w of every stepping 10 μ V
2trickle compensation being carried out to temperature, flowing through temperature compensation dish w to allow 1mA electric current
1, 1018 Ω set up resistance R
n, temperature compensation dish w
2, 100.7972 Ω resistance R in parallel between node D with node E
8make its shunting 10.111mA electric current.
Small voltage measurement mechanism 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 11.2 ~ 12V, just can conveniently by regulating adjustable resistance R
p1, adjustable resistance R
p2, adjustable resistance R
p3small voltage measurement mechanism working current is adjusted to standard state.
Claims (1)
1. have a small voltage measurement mechanism for five measurement dishes, small voltage measurement mechanism is from the external working power E positive pole terminal adjustable resistance R through 21 5 Ω resistant series be made up of of range of adjustment between 11.2 ~ 12V
p1, the adjustable resistance R to be made up of 21 0.25 Ω resistant series
p2, and the adjustable resistance R of range of adjustment between 0 ~ 0.27 Ω
p3, again through five step discs, to temperature compensation dish w
1, 1018 Ω set up resistance R
n, temperature compensation dish w
2get back to the external working power E negative pole terminal composition small voltage measurement mechanism performance loop of small voltage measurement mechanism range of adjustment between 11.2 ~ 12V, from external saturated standard cell E
npositive pole terminal is connected to the double-point double-throw switch K of galvanometer G to arriving temperature compensation dish w between two normally closed contacts
1, 1018 Ω set up resistance R
n, temperature compensation dish w
2to external saturated standard cell E
nnegative pole terminal composition small voltage measurement mechanism standard loop, for connecting measured " U
x" two terminals, positive pole terminal is after five measurement dishes, then the double-point double-throw switch K being connected to galvanometer G between two normally closed contacts is to negative pole terminal composition small voltage measurement mechanism equalizing network, it is characterized in that the first temperature compensation dish W
1have 0,1,2 ... 10 totally 11 gears, connect the resistance one that resistance is 0.1 Ω, the second temperature compensation dish W between each shelves contact
2have 0,1,2 ... 10 totally 16 gears, connect the resistance one that resistance is 0.01 Ω, compensating disc W between each shelves contact
1" 10 " contact and 100.7972 Ω resistance R
8one end sys node D, compensating disc W
2" 16 " contact and 100.7972 Ω resistance R
8other end sys node E, compensating disc W
1" 0 " contact and compensating disc W
2" 0 " contact set up resistance R by 1018 Ω
nconnect, first step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish I with have 0, 1, 2, the replacement dish I ' composition of 10 totally 11 gears, the resistance one that resistance is 0.01 Ω is connected between measurement dish I with each shelves contact of replacement dish I ', " 0 " contact of measurement dish I is circuit node A, and " 10 " contact of replacement dish I ' is circuit node B, 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 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 second step disc on measurement dish II and replacement dish II ', 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 I ' with measurement dish I in the first step disc, the Metal Contact ring of the first step disc measurement dish I and the Metal Contact interannular of the replacement dish I ' resistance R of 999.9 Ω
1connect, 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 10K Ω
2connect, 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 100K Ω
3connect, 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 1M Ω
4connect, 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 10M Ω
5connect, synchronous when the brush on each step disc measurement dish rotates with the brush on replacement dish, " 0 " contact of measurement dish I and node A connect adjustable resistance R
p3cold end, " 10 " contact of replacement dish I ' and Node B connected node D, node E connects external working power E negative pole terminal, for connecting measured " U
x" two measure terminals, positive pole terminal is connected with " 0 " contact of measurement dish I, and negative pole terminal is connected with " 10 " contact of measurement dish I 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 |
|---|---|---|---|
| CN201420419585.6U CN204044220U (en) | 2014-07-24 | 2014-07-24 | Small voltage measurement mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420419585.6U CN204044220U (en) | 2014-07-24 | 2014-07-24 | Small voltage measurement mechanism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204044220U true CN204044220U (en) | 2014-12-24 |
Family
ID=52244870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420419585.6U Withdrawn - After Issue CN204044220U (en) | 2014-07-24 | 2014-07-24 | Small voltage measurement mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204044220U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122429A (en) * | 2014-07-24 | 2014-10-29 | 富阳兴远仪器仪表经营部 | Micro-voltage measuring device |
-
2014
- 2014-07-24 CN CN201420419585.6U patent/CN204044220U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122429A (en) * | 2014-07-24 | 2014-10-29 | 富阳兴远仪器仪表经营部 | Micro-voltage measuring device |
| CN104122429B (en) * | 2014-07-24 | 2016-09-21 | 富阳兴远仪器仪表经营部 | Small voltage measurement apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141224 Effective date of abandoning: 20160921 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |