CN105548647A - Potentiometer with seven stepping discs - Google Patents
Potentiometer with seven stepping discs Download PDFInfo
- Publication number
- CN105548647A CN105548647A CN201511034246.1A CN201511034246A CN105548647A CN 105548647 A CN105548647 A CN 105548647A CN 201511034246 A CN201511034246 A CN 201511034246A CN 105548647 A CN105548647 A CN 105548647A
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- China
- Prior art keywords
- dish
- resistance
- measurement
- step disc
- replacement
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
- G01R17/20—AC or DC potentiometric measuring arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/44—Modifications of instruments for temperature compensation
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a potentiometer with seven stepping discs. The front two discs employ a special line of both replacement discs and shunt discs, the third disc employs a substitution disc, four stepping discs after the third disc are composed of measurement discs and substitution discs in the same structure as the measurement discs, corresponding contacts on the rear four stepping disc measurement discs and substitution discs are connected, there are no resistors on the rear three stepping discs, and thus the influences of lead resistance inside the potentiometer, switch contact resistance and variation, and thermoelectric potential on the potentiometer can be neglected.
Description
Technical field
The present invention relates to the instrument that DC voltage is measured.
Background technology
The current potential difference meter for there being multiple step disc, in connection between multiple step disc, telophragma generally adopts replacement dish structure, as the first step disc adopts 1000 Ω measurement dishes and replacement dish, the second step disc just adopts 100 Ω measurement dishes and replacement dish, and the 3rd step disc just adopts 10 Ω measurement dishes and replacement dish, by that analogy, this configuration switches contact resistance and variation greatly, so only coil with three in the middle of general, make the potential difference meter of five step discs; Mostly the measurement dish on step disc and replacement dish are constituted bridge circuit in circuit for there being the potential difference meter of seven step discs, 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.
Summary of the invention
The object of the invention is to design a kind of potential difference meter having seven step discs, 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.
Technical scheme of the present invention is taked like this: from the adjustable resistance R of positive pole terminal through being made up of 22 2.1 Ω resistance of the external 3V working power E of potential difference meter
p1, the adjustable resistance R that forms of 22 0.1 Ω resistance
p2, the adjustable resistance R of range of adjustment between 0 ~ 0.11 Ω
p3, then form temperature compensation dish W through seven step discs and by 10 0.1 Ω resistance
1, 1018 Ω set up resistance R
8, 16 0.01 Ω resistance form temperature compensation dish W
2get back to the negative pole terminal composition potential difference meter performance loop of the external 3V working power E of potential difference meter, from external saturated standard cell E
npositive pole terminal between two normally closed contacts, be connected to the double-point double-throw switch K of galvanometer G, form temperature compensation dish W to 10 0.1 Ω resistance
1, 1018 Ω set up resistance R
8, again through forming temperature compensation dish W by 16 0.01 Ω resistance
2get back to external saturated standard cell E
nnegative pole terminal composition potential difference meter standard loop, temperature compensation dish W
110th gear contact, temperature compensation dish W
2113.24 Ω resistance R in parallel between the 16th gear contact
8, for connecting measured " U
x" two terminals, positive pole terminal is after seven 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 potential difference meter equalizing network, it is characterized in that: the first step disc by respectively having 0,1,2 ... 10 totally 11 gear measurement dish I and replacement dish I ' compositions, measurement dish I and replacement dish I ' is welded with 10 Ω resistance one between each gear contact, measurement dish I the 0th gear contact and adjustable resistance R
p3connect, this tie point be circuit node C, measurement dish I the 10th gear contact is connected with replacement dish I ' the 0th gear contact, replacement dish I ' the 10th gear contact and temperature compensation dish W
110th gear contact connects, second step disc by respectively having 0,1,2 ... 10 totally 11 gear measurement dish II and replacement dish II ' compositions, measurement dish II and replacement dish II ' is welded with 5 Ω resistance one between each gear contact, measurement dish II the 0th gear contact connects the Metal Contact ring of measurement dish I, and measurement dish II the 10th gear contact is through 60 Ω resistance R
6be connected with replacement dish II ' the 0th gear contact afterwards, replacement dish II ' the 10th gear contact is through 295 Ω resistance R
7rear connection replacement dish I ' Metal Contact ring, the 3rd step disc is by respectively having 0, 1, 2, 10 totally 11 gear measurement dish III and replacement dish III ' compositions, measurement dish III and replacement dish III ' is welded with 1 Ω resistance one between each gear contact, and the 4th step disc is by respectively having 0, 1, 2, 10 totally 11 gear measurement dish IV and replacement dish IV ' compositions, measurement dish IV and replacement dish IV ' is welded with 1 Ω resistance one between each gear contact, on 4th step disc, measurement dish IV the 0th gear contact is circuit node A, on 4th step disc, replacement dish IV ' the 10th gear contact is circuit node B, and the 5th step disc is by respectively having 0, 1, 2, 10 totally 11 gear measurement dish V and replacement dish V ' compositions, the 6th step disc is by respectively having 0, 1, 2, 10 totally 11 gear measurement dish VI and replacement dish VI ' compositions, the 7th step disc is by respectively having 0, 1, 2, 10 totally 11 gear measurement dish VII and replacement dish VII ' compositions, each contact on the 5th step disc measurement dish V and replacement dish V ', each contact on 6th step disc measurement dish VI and replacement dish VI ', 7th step disc measurement dish VII is connected with the corresponding contact on replacement dish IV ' with each contact on replacement dish VII ' and the 4th step disc measurement dish IV, 3rd step disc measurement dish III the 0th gear contact connecting circuit node A, the Metal Contact ring of the 3rd step disc measurement dish III connects the Metal Contact ring of the second step disc measurement dish II, 3rd step disc replacement dish III ' the 10th gear contact connecting circuit Node B, with 112.4986 Ω resistance R between circuit node A and circuit node B
5connect, the Metal Contact ring of the 3rd step disc replacement dish III ' connects the Metal Contact ring of the second step disc replacement dish II ', the Metal Contact ring of the 4th step disc measurement dish IV and the Metal Contact interannular 990 Ω resistance R of replacement dish IV '
1connect, the Metal Contact ring of the 5th step disc measurement dish V and the Metal Contact interannular 9990 Ω resistance R of replacement dish V '
2connect, the Metal Contact ring of the 6th step disc measurement dish VI and the Metal Contact ring 99990 Ω resistance R of replacement dish VI '
3connect, the Metal Contact ring of the 7th step disc measurement dish VII and the Metal Contact ring 1000K Ω resistance R of replacement dish VII '
4connect, for connecting measured " U
x" two measure terminals, positive pole terminal is connected to circuit node C, and negative pole terminal is connected with " 10 " the gear contact of measurement dish IV after being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts.
By above technical scheme, seven step disc constructions of switch of equalizing network are identical, and resistance kind is few, and all there is no resistance between the 5th, the 6th, the 7th step disc contact, this gives to produce and brings convenience with maintenance, also makes potential difference meter structure simple, volume-diminished, thus reduce production cost.
Accompanying drawing explanation
Fig. 1 is schematic circuit of the present invention.
In FIG, the adjustable resistance R of 22 × 2.1 Ω
p1, represent adjustable resistance R
p1on have 22 resistances to be resistant series of 2.1 Ω, in like manner, the adjustable resistance R of 22 × 0.1 Ω
p2, represent adjustable resistance R
p2on have 22 resistances to be resistant series of 0.1 Ω, 10 × 10 Ω on first step disc, represent and measurement dish and replacement dish have 10 resistances to be resistant series of 10 Ω, in FIG, on step disc, thick black line represents Metal Contact ring, hollow small circle represents hard contact, and four-headed arrow represents metallic brush.
Embodiment
In FIG, 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 step disc is in rotation process, circuit always hinders constant, vice versa, so no matter what indicating value three step discs put, and this step disc in circuit resistance value is constant.Between node A and Node B, resistance value is 100 Ω, adds resistance totally 110 Ω of the 3rd step disc 10 Ω, except ten 5 Ω resistance between the second step disc measurement dish brush and replacement dish brush, and the resistance R of 60 Ω that also connected
6, like this, the resistor coupled in parallel of two 110 Ω is known, and between the second step disc measurement dish brush and replacement dish brush, resistance value is 55 Ω, is ten 5 Ω resistance, as series connection 295 Ω resistance R outside the second step disc measurement dish brush and replacement dish brush
7with 400 Ω resistance values and between the first step disc measurement dish brush and replacement dish brush during 100 Ω resistor coupled in parallel, resistance is 4: 1, the electric current flow through is exactly 1: 4, when potential difference meter working current is designed to 10mA, 8mA electric current flows through the first step disc, 2mA electric current flows through the second step disc, and wherein 1mA electric current flows through the resistance R of 60 Ω
6, another 1mA electric current flows through the 3rd step disc; 1mA working current is divided into four tunnels after node A: a road is through measurement dish IV, and a road is through measurement dish V, and a road is through measurement dish VI, and a road is through measurement dish VII, and four road electric currents meet at Node B; Each branch resistance ratio between node A, Node B: the 7th step disc: the 6th step disc: the 5th step disc: the 4th step disc=1000: 100: 10: 1, so, flowing through each branch current ratio between node A, Node B is: the 7th step disc: the 6th step disc: the 5th step disc: the 4th stepping=1: 10: 100: 1000, if allow 0.8889mA flow through resistance R
5, that just has 0.1111mA to flow through four step discs after potential difference meter, and rear four step discs always hinder for 1000K Ω/1111, resistance R
5resistance be 100 Ω/0.8889=112.4986 Ω.
When the double-point double-throw switch K being connected to galvanometer G between two normally closed contacts puts on the left side, 1mA electric current all flows through some resistance on measurement dish VI, 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 4th step disc contribution is 1 × 10
-1mV, the magnitude of voltage of the 5th step disc contribution is 1 × 10
-2mV, the magnitude of voltage of the 6th step disc contribution is 1 × 10
-3mV, the magnitude of voltage of the 7th step disc contribution is 1 × 10
-4mV; The each stepping of potential difference meter first step disc is 10 × 10mV, and each stepping of the second step disc is 2 × 5mV, and each stepping of the 3rd step disc is 1 × 1mV.
Be 100 Ω resistance and 400 Ω resistor coupled in parallel between the first step disc measurement dish brush and replacement dish brush, the resistance after parallel connection is 80 Ω, and outer between the first step disc measurement dish brush and replacement dish brush is 100 Ω resistance, so circuit node C is to temperature compensation dish W
1the 10th gear contact between resistance be 180 Ω.
Saturated standard cell electromotive force 20 DEG C time is 1.0186V, and temperature often raises 1 DEG C of electromotive force decline about 40 μ V, just compensates with temperature compensation dish, 10mA electric current all flows through the resistance on temperature compensation dish, resistance will do very little, difficult, therefore uses the resistance R of 113.24 Ω
8divide the 9mA electric current that pours off; Like this, temperature compensation dish W
2every stepping compensates 10 μ V, temperature compensation dish W
1every stepping compensates 100 μ V, temperature compensation dish W
1the 10th gear contact to resistance about 102 Ω of power supply E negative pole terminal, so, negative pole terminal resistance value about 282 Ω from node C to power supply E, about 2.8V power supply can obtain 10mA electric current.
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 2.6 ~ 3.3V, 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. there is a potential difference meter for seven step discs, from the adjustable resistance R of positive pole terminal through being made up of 22 2.1 Ω resistance of the external 3V working power E of potential difference meter
p1, the adjustable resistance R that forms of 22 0.1 Ω resistance
p2, the adjustable resistance R of range of adjustment between 0 ~ 0.11 Ω
p3, then form temperature compensation dish W through seven step discs and by 10 0.1 Ω resistance
1, 1018 Ω set up resistance R
8, 16 0.01 Ω resistance form temperature compensation dish W
2get back to the negative pole terminal composition potential difference meter performance loop of the external 3V working power E of potential difference meter, from external saturated standard cell E
nthe positive pole terminal double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts set up resistance R to 1018 Ω
8, then through forming temperature compensation dish W by 10 0.1 Ω resistance
1, 1018 Ω set up resistance R
8, 16 0.01 Ω resistance form temperature compensation dish W
2get back to external saturated standard cell E
nnegative pole terminal composition potential difference meter standard loop, temperature compensation dish W
110th gear contact, temperature compensation dish W
2113.24 Ω resistance R in parallel between the 16th gear contact
8, for connecting measured " U
x" two terminals, positive pole terminal is after seven 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 potential difference meter equalizing network, it is characterized in that: the first step disc by respectively having 0,1,2 ... 10 totally 11 gear measurement dish I and replacement dish I ' compositions, measurement dish I and replacement dish I ' is welded with 10 Ω resistance one between each gear contact, measurement dish I the 0th gear contact and adjustable resistance R
p3connect, this tie point be circuit node C, measurement dish I the 10th gear contact is connected with replacement dish I ' the 0th gear contact, replacement dish I ' the 10th gear contact and temperature compensation dish W
110th gear contact connects, second step disc by respectively having 0,1,2 ... 10 totally 11 gear measurement dish II and replacement dish II ' compositions, measurement dish II and replacement dish II ' is welded with 5 Ω resistance one between each gear contact, measurement dish II the 0th gear contact connects the Metal Contact ring of measurement dish I, and measurement dish II the 10th gear contact is through 60 Ω resistance R
6be connected with replacement dish II ' the 0th gear contact afterwards, replacement dish II ' the 10th gear contact is through 295 Ω resistance R
7rear connection replacement dish I ' Metal Contact ring, the 3rd step disc is by respectively having 0, 1, 2, 10 totally 11 gear measurement dish III and replacement dish III ' compositions, measurement dish III and replacement dish III ' is welded with 1 Ω resistance one between each gear contact, and the 4th step disc is by respectively having 0, 1, 2, 10 totally 11 gear measurement dish IV and replacement dish IV ' compositions, measurement dish IV and replacement dish IV ' is welded with 1 Ω resistance one between each gear contact, on 4th step disc, measurement dish IV the 0th gear contact is circuit node A, on 4th step disc, replacement dish IV ' the 10th gear contact is circuit node B, and the 5th step disc is by respectively having 0, 1, 2, 10 totally 11 gear measurement dish V and replacement dish V ' compositions, the 6th step disc is by respectively having 0, 1, 2, 10 totally 11 gear measurement dish VI and replacement dish VI ' compositions, the 7th step disc is by respectively having 0, 1, 2, 10 totally 11 gear measurement dish VII and replacement dish VII ' compositions, each contact on the 5th step disc measurement dish V and replacement dish V ', each contact on 6th step disc measurement dish VI and replacement dish VI ', 7th step disc measurement dish VII is connected with the corresponding contact on replacement dish IV ' with each contact on replacement dish VII ' and the 4th step disc measurement dish IV, 3rd step disc measurement dish III the 0th gear contact connecting circuit node A, the Metal Contact ring of the 3rd step disc measurement dish III connects the Metal Contact ring of the second step disc measurement dish II, 3rd step disc replacement dish III ' the 10th gear contact connecting circuit Node B, with 112.4986 Ω resistance R between circuit node A and circuit node B
5connect, the Metal Contact ring of the 3rd step disc replacement dish III ' connects the Metal Contact ring of the second step disc replacement dish II ', the Metal Contact ring of the 4th step disc measurement dish IV and the Metal Contact interannular 990 Ω resistance R of replacement dish IV '
1connect, the Metal Contact ring of the 5th step disc measurement dish V and the Metal Contact interannular 9990 Ω resistance R of replacement dish V '
2connect, the Metal Contact ring of the 6th step disc measurement dish VI and the Metal Contact ring 99990 Ω resistance R of replacement dish VI '
3connect, the Metal Contact ring of the 7th step disc measurement dish VII and the Metal Contact ring 1000K Ω resistance R of replacement dish VII '
4connect, for connecting measured " U
x" two measure terminals, positive pole terminal is connected to circuit node C, and negative pole terminal is connected with " 10 " the gear contact of measurement dish IV 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 |
|---|---|---|---|
| CN201511034246.1A CN105548647A (en) | 2015-12-29 | 2015-12-29 | Potentiometer with seven stepping discs |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511034246.1A CN105548647A (en) | 2015-12-29 | 2015-12-29 | Potentiometer with seven stepping discs |
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| Publication Number | Publication Date |
|---|---|
| CN105548647A true CN105548647A (en) | 2016-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511034246.1A Pending CN105548647A (en) | 2015-12-29 | 2015-12-29 | Potentiometer with seven stepping discs |
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| CN (1) | CN105548647A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199128A (en) * | 2016-08-17 | 2016-12-07 | 杭州戎密科技有限公司 | There is the potential difference meter of seven step discs |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101757A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Voltage measuring apparatus with temperature compensation plate |
| CN104101756A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Voltage measuring apparatus with five stepping plates |
| CN204044219U (en) * | 2014-07-24 | 2014-12-24 | 骆孝峰 | Voltage-measuring equipment |
-
2015
- 2015-12-29 CN CN201511034246.1A patent/CN105548647A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101757A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Voltage measuring apparatus with temperature compensation plate |
| CN104101756A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Voltage measuring apparatus with five stepping plates |
| CN204044219U (en) * | 2014-07-24 | 2014-12-24 | 骆孝峰 | Voltage-measuring equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106199128A (en) * | 2016-08-17 | 2016-12-07 | 杭州戎密科技有限公司 | There is the potential difference meter of seven step discs |
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Application publication date: 20160504 |