CN204044219U - Voltage-measuring equipment - Google Patents
Voltage-measuring equipment Download PDFInfo
- Publication number
- CN204044219U CN204044219U CN201420419582.2U CN201420419582U CN204044219U CN 204044219 U CN204044219 U CN 204044219U CN 201420419582 U CN201420419582 U CN 201420419582U CN 204044219 U CN204044219 U CN 204044219U
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- Prior art keywords
- dish
- measurement
- resistance
- contact
- replacement
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Abstract
A kind of voltage-measuring equipment for DC voltage measurement, six step discs are all coiled by measurement and the replacement dish identical with measurement dish structure forms, 1 Ω resistance one is welded between the measurement dish of two step discs and the adjacent contacts of replacement dish before it, three step disc measurement dishes next are connected with the corresponding contact on replacement dish with the 3rd step disc measurement dish with the contact on replacement dish, and it makes the switch contact resistance of pressure measuring instrument and variation, thermoelectrical potential all very little on voltage-measuring equipment impact.
Description
Technical field
The utility model relates to the instrument measured DC voltage.
Background technology
The current voltage-measuring equipment for there being five step discs, in connection between five step discs, telophragma generally adopts the current voltage measuring apparatus for there being multiple step disc of switch, in connection between multiple step disc, telophragma generally adopts switching over, so just produce the variation of contact resistance, bring 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 voltage measuring apparatus solution switch contact resistance that the utility model patents such as application number 200510062236.9,200810121910.X disclose multiple step disc is deteriorated, its multiple step discs are all coiled by measurement and replacement dish forms, each measurement dish and replacement dish there is resistance, measurement dish on its multiple 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 voltage-measuring equipment having six 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: voltage-measuring equipment is from the external working power E positive pole terminal adjustable resistance R through 20 5 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 21 0.25 Ω resistant series
p2, and the adjustable resistance R of range of adjustment between 0 ~ 0.26 Ω
p3, through six step discs, set up resistance R to 101.8 Ω
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 voltage-measuring equipment performance loop of range of adjustment between 2.2 ~ 3V, from unsaturated standard cell E
nthe double-point double-throw switch K that positive pole is connected to galvanometer G between two normally closed contacts sets up resistance R to 101.8 Ω
nand the adjustable resistance R of range of adjustment lockable sliding contact between 0 ~ 0.2 Ω
p4, then through 200K Ω resistance R
0to unsaturated standard cell E
nnegative pole composition voltage-measuring equipment standard loop, for connecting measured " U
x" two terminals, positive pole terminal is after six 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 voltage-measuring equipment 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 replacement dish I ' composition of 10 totally 11 gears, weld 1 Ω resistance one between upper every two adjacent contacts of measurement dish I and replacement dish I ', 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, weld 1 Ω resistance one between upper every two adjacent contacts of measurement dish II and replacement dish II ', 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, 0.1111 Ω resistance one is welded between measurement dish III with upper every two adjacent contacts of replacement dish III ', " 0 " contact of measurement dish III is circuit node A, " 10 " contact of replacement dish III ' is circuit node B, and 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, the 6th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish VI with have 0, 1, 2, the replacement dish VI ' composition of 10 totally 11 gears, 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 ', each contact in 5th step disc on measurement dish V and replacement dish V ', each contact in 6th step disc on measurement dish VI and replacement dish VI ', be connected with the corresponding contact of replacement dish III ' with measurement dish III in the 3rd step disc, 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 998.89 Ω
1connect, 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 9999 Ω
2connect, 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 100K Ω
3connect, the Metal Contact ring of the 6th step disc measurement dish VI and the Metal Contact interannular of the replacement dish VI ' resistance R of 1000K Ω
4connect, it is synchronous when brush on each step disc measurement dish rotates with the brush on replacement dish, " 0 " contact of measurement dish III and node A connect " 0 " contact of 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 ' and Node B connect " 10 " contact of replacement dish II ', and the Metal Contact ring of replacement dish II ' is through the resistance R of 79.91 Ω
5connect the Metal Contact ring of replacement dish I ', " 10 " contact of measurement dish I is by 100 Ω resistance R
6connect " 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, positive pole terminal is connected with " 0 " contact of measurement dish I, and negative pole terminal is 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, resistance is identical, and all there is no resistance between the 4th, the 5th, the 6th step disc contact, this gives to produce and brings convenience with maintenance, also make voltage-measuring equipment structure simple, volume-diminished, thus reduce production cost.
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 20 × 5 Ω
p1, represent adjustable resistance R
p1on have 20 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 × 1 Ω on first step disc, the second step disc, represent and measurement dish and replacement dish have 10 resistances to be resistant series of 1 Ω, in the accompanying drawings, on step disc, thick black line represents Metal Contact ring, hollow small circle represents hard contact, and four-headed arrow represents metallic brush.
In the accompanying drawings, the resistance that every stepping is coiled in first, second, third step disc measurement to be increased equals the resistance that every stepping minimizing is coiled in replacement, so measurement dish is 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 the resistance that electric current flows through the minimizing of replacement dish, vice versa, so, what indicating value no matter rear three 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 three 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.
Voltage-measuring equipment standard operation current design becomes 10mA, between the brush of the first step disc measurement dish I and the brush of replacement dish I ' through 100 Ω resistance R
6resistance be 110 Ω, the resistance through node A, Node B between the brush of the first step disc measurement dish I and the brush of replacement dish I ' is 990 Ω, so there is 9mA current flowing resistance R
6, have 1mA electric current to flow through node A to Node B.
Voltage-measuring equipment 1mA 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 a road is through measurement dish VI, and four road electric currents meet at Node B; Each branch resistance ratio between node A, Node B: the 6th step disc: the 5th step disc: the 4th stepping: the 3rd step disc=1000: 100: 10: 1, so, flowing through each branch current ratio between node A, Node B is: the 6th step disc: the 5th step disc: the 4th stepping: the 3rd step disc=1: 10: 100: 1000, when the double-point double-throw switch K being connected to galvanometer G between two normally closed contacts puts on the left side, voltage-measuring equipment 1mA electric current all flows through some resistance on measurement dish III, and this resistance is at the measured " U of connection
x" two to measure the magnitude of voltage shown between terminals be 0.1111mV, the magnitude of voltage of the 3rd step disc contribution is 1 × 10
-1mV, the magnitude of voltage of the 4th step disc contribution is 1 × 10
-2mV, the magnitude of voltage of the 5th step disc contribution is 1 × 10
-3mV, the magnitude of voltage of the 6th step disc contribution is 1 × 10
-4mV, therefore, each stepping of the first step disc is 10mV, the each stepping of second step disc is 1mV, and each stepping of the 3rd step disc is 0.1mV, and each stepping of the 4th step disc is 0.01mV, the each stepping of 5th step disc is 0.001mV, and each stepping of the 6th step disc is 0.1 μ V.
Voltage-measuring equipment 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
p3voltage-measuring equipment working current is adjusted to standard state.
The standard operation electric current of voltage-measuring equipment is such acquisition: 100mV standard signal voltage by polarity and voltage-measuring equipment " U
x" two measure terminal and connect, the total indicating value of each step disc of voltage-measuring equipment is identical with standard signal magnitude of voltage, and double-point double-throw switch K throws to the left side, adjustment 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 repeat once, adjustable resistance R
p4locking, at this moment the working current of voltage-measuring equipment is with regard to standardization, when instrument uses, first proofreads standard, when will carry out reading to reading dial, reading again after check and correction standard.In standard loop, for avoiding loop current excessive, adopt 200K Ω resistance R
0carry out current limliting, the electromotive force due to unsaturated standard cell is discrete, and 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, can the variation range of coverage criteria cell emf.
Claims (1)
1. a voltage-measuring equipment, voltage-measuring equipment is from the external working power E positive pole terminal adjustable resistance R through 20 5 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 21 0.25 Ω resistant series
p2, and the adjustable resistance R of range of adjustment between 0 ~ 0.26 Ω
p3, through six step discs, set up resistance R to 101.8 Ω
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 voltage-measuring equipment performance loop of range of adjustment between 2.2 ~ 3V, from unsaturated standard cell E
nthe double-point double-throw switch K that positive pole is connected to galvanometer G between two normally closed contacts sets up resistance R to 101.8 Ω
nand the adjustable resistance R of range of adjustment lockable sliding contact between 0 ~ 0.2 Ω
p4, then through 200K Ω resistance R
0to unsaturated standard cell E
nnegative pole composition voltage-measuring equipment standard loop, for connecting measured " U
x" two terminals, positive pole terminal is after six 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 voltage-measuring equipment 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 replacement dish I ' composition of 10 totally 11 gears, weld 1 Ω resistance one between upper every two adjacent contacts of measurement dish I and replacement dish I ', 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, weld 1 Ω resistance one between upper every two adjacent contacts of measurement dish II and replacement dish II ', 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, 0.1111 Ω resistance one is welded between measurement dish III with upper every two adjacent contacts of replacement dish III ', " 0 " contact of measurement dish III is circuit node A, " 10 " contact of replacement dish III ' is circuit node B, and 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, the 6th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish VI with have 0, 1, 2, the replacement dish VI ' composition of 10 totally 11 gears, 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 ', each contact in 5th step disc on measurement dish V and replacement dish V ', each contact in 6th step disc on measurement dish VI and replacement dish VI ', be connected with the corresponding contact of replacement dish III ' with measurement dish III in the 3rd step disc, 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 998.89 Ω
1connect, 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 9999 Ω
2connect, 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 100K Ω
3connect, the Metal Contact ring of the 6th step disc measurement dish VI and the Metal Contact interannular of the replacement dish VI ' resistance R of 1000K Ω
4connect, it is synchronous when brush on each step disc measurement dish rotates with the brush on replacement dish, " 0 " contact of measurement dish III and node A connect " 0 " contact of 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 ' and Node B connect " 10 " contact of replacement dish II ', and the Metal Contact ring of replacement dish II ' is through the resistance R of 79.91 Ω
5connect the Metal Contact ring of replacement dish I ', " 10 " contact of measurement dish I is by 100 Ω resistance R
6connect " 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, positive pole terminal is connected with " 0 " contact of measurement dish I, and negative pole terminal is 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 |
|---|---|---|---|
| CN201420419582.2U CN204044219U (en) | 2014-07-24 | 2014-07-24 | Voltage-measuring equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420419582.2U CN204044219U (en) | 2014-07-24 | 2014-07-24 | Voltage-measuring equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204044219U true CN204044219U (en) | 2014-12-24 |
Family
ID=52244869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420419582.2U Expired - Fee Related CN204044219U (en) | 2014-07-24 | 2014-07-24 | Voltage-measuring equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204044219U (en) |
Cited By (4)
| 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 |
| CN105548648A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | DC potentiometer with seven stepping discs |
| CN105548647A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | Potentiometer with seven stepping discs |
| CN104101758B (en) * | 2014-07-24 | 2017-01-25 | 富阳兴远仪器仪表经营部 | Voltage measuring instrument |
-
2014
- 2014-07-24 CN CN201420419582.2U patent/CN204044219U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101758B (en) * | 2014-07-24 | 2017-01-25 | 富阳兴远仪器仪表经营部 | Voltage measuring instrument |
| CN105548649A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | Potentiometer with six stepping discs |
| CN105548648A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | DC potentiometer with seven stepping discs |
| CN105548647A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | Potentiometer with seven 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: 20141224 Termination date: 20160724 |