CN104101761B - Potential difference meter - Google Patents
Potential difference meter Download PDFInfo
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- CN104101761B CN104101761B CN201410363533.6A CN201410363533A CN104101761B CN 104101761 B CN104101761 B CN 104101761B CN 201410363533 A CN201410363533 A CN 201410363533A CN 104101761 B CN104101761 B CN 104101761B
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- dish
- resistance
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- step disc
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Abstract
A kind of potential difference meter having four step discs for DC voltage measurement, its each step disc is made up of measurement dish and the replacement dish identical with measurement dish structure, its first step disc is welded with resistance between the contact of measurement dish and replacement dish, all without resistance on all the other step discs, it makes potential difference meter inner lead resistance, switch contact resistance and variation, thermoelectrical potential that potential difference meter impact can both be ignored.
Description
Technical field
The present invention relates to the instrument to DC voltage measurement.
Background technology
Currently for the potential difference meter having four step discs, in the connection between four step discs, the commonly used switch switching of telophragma, thus produce the variation of contact resistance, bring restriction to resolution.In order to overcome this problem, it is generally adopted big brush to increase contact area, and adopts silver-copper composite；Application number 200810120441.X discloses the potential difference meter of four step discs and solves the new method that switch contact resistance is deteriorated, its four step discs are all made up of measurement dish and replacement dish, without bracket panel, each measurement dish and replacement dish there is resistance, measurement dish on its four step discs and replacement dish constitute bridge circuit in circuit, its maximum defect is in that error is not independent, once measurement dish point indicating value is overproof, just cannot determining which resistance is overproof to cause, this makes troubles with maintenance to identifying.
Summary of the invention
It is an object of the invention to design a kind of potential difference meter having four 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 cost, reduces instrument volume.
Technical scheme is so taked: from the positive pole terminal of the external working power E of potential difference meter 10～11V through 100 Ω resistance RM, the adjustable resistance R that is made up of 21 4 Ω resistant seriesP1, the adjustable resistance R that is made up of 21 0.2 Ω resistant seriesP2, and range of accommodation adjustable resistance R between 0～0.22 ΩP3, through through four step discs, setting up resistance R to 91.7 ΩN, then through the adjustable resistance R of 0～0.1 Ω lockable sliding contactP4Return to the negative pole terminal composition potential difference meter performance loop of the external working power E of potential difference meter 10～11V；From unsaturated standard cell ENPositive pole is connected to double-point double-throw switch K to 91.7 Ω of galvanometer G between two normally-closed contacts and sets up resistance RNAnd range of accommodation adjustable resistance R of lockable sliding contact between 0～0.1 ΩP4, then through 200K Ω resistance R0To unsaturated standard cell ENNegative pole composition potential difference meter standard loop；For connecting measured " UX" two terminals, positive pole terminal, after four measurement disks, forms potential difference meter to negative pole terminal compensate loop then through being connected to the double-point double-throw switch K of galvanometer G between two normally-closed contacts；nullIt 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，The resistance one that resistance is 0.01 Ω it is connected between each shelves contact of measurement dish I and replacement dish I '，" 0th " contact of measurement dish I is circuit node A，" 10th " contact of replacement dish I ' is circuit node B，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，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，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，Each contact on measurement dish II and replacement dish II ' in second step disc，Each contact on measurement dish III and replacement dish III ' in 3rd step disc，Each contact on measurement dish IV and replacement dish IV ' in 4th step disc，It is connected with the contact corresponding to replacement dish I ' of measurement dish I in the first step disc，The metal contact ring of the first step disc measurement dish I contacts the resistance R of interannular 999.9 Ω with the metal of replacement dish I '1Connecting, the metal contact ring of the second step disc measurement dish II contacts the resistance R of interannular 10K Ω with the metal of replacement dish II '2Connecting, the metal contact ring of the 3rd step disc measurement dish III contacts the resistance R of interannular 100K Ω with the metal of replacement dish III '3Connecting, the metal contact ring of the 4th step disc measurement dish IV contacts the resistance R of interannular 1000K Ω with the metal of replacement dish IV '4Connecting, the brush on each step disc measurement dish is Tong Bu when rotating with the brush on replacement dish, and " 0th " contact of measurement dish I and node A connect adjustable resistance RP3Cold end, " 10th " contact of replacement dish I ' and node B connect and set up resistance RNHot end, be used for connecting measured " UX" two measure terminals, positive pole terminal is connected with " 0th " contact of measurement dish I, and negative pole terminal is connected with " 10th " 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, between the 4th step disc contact all without resistance, and four step disc errors are independent, the error of the rear three identical steppings of dish is consistent, and this brings convenience to debugging and maintenance, also makes potential difference meter simple in construction, volume-diminished, thus reducing production cost；When potential difference meter four measurement disks reset, 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 only small, the thermoelectrical potential of four several μ V of each branch road of step disc is all connected in the voltage drop in units of volt, and therefore thermoelectrical potential is to " UX" two measure terminals impact can ignore.
Accompanying drawing explanation
Fig. 1 is a kind of schematic circuit of the present invention.
In FIG, the adjustable resistance R of 21 × 4 ΩP1, represent adjustable resistance RP1On to have 21 resistances be the resistant series of 4 Ω, in like manner, the adjustable resistance R of 21 × 0.2 ΩP2, represent adjustable resistance RP2On to have 21 resistances be the resistant series of 0.2 Ω, 10 × 0.01 Ω on the first step disc measurement dish I and replacement dish I ', represent the resistant series having 10 resistances to be 0.01 Ω on measurement dish I and replacement dish I ',
In FIG, on step disc, heavy black bar represents metal contact ring, and hollow small circle represents hard contact, and four-headed arrow represents metallic brush.
Detailed description of the invention
Embodiment 1, in FIG, when between node A, node B, in four step discs, any one step disc rotates, the resistance that electric current flows through measurement dish and increases flows through, equal to electric current, the resistance that replacement dish reduces, vice versa, so, what indicating value no matter four step discs put, and this step disc resistance value between node A and node B is constant, and this can guarantee that what indicating value no matter four step discs put, each step disc resistance ratio is constant, also ensures that the electric current of each step disc is constant.
Each step disc resistance ratio: the first step disc: the second step disc: the 3rd step disc: the 4th step disc=1: 10: 102∶103, so, flow through each step disc current ratio: the first step disc: the second step disc: the 3rd step disc: the 4th step disc=103∶102∶10∶1.Potential difference meter standard operating current is designed to 11.11mA, then standard operating current flows through the first step disc 10mA, flows through the second step disc 1mA, flows through the 3rd step disc 0.1mA, and flowing through the 4th step disc is 0.01mA, and at this moment the first each stepping of step disc is 1 × 10-1MV, the second each stepping of step disc is 1 × 10-2MV, the 3rd each stepping of step disc is 1 × 10-3MV, the 4th each stepping of step disc is 1 × 10-4MV, first step disc resistance 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 contacts interannular connection with the metal of replacement dish is bigger, and the impact that switch contact resistance is deteriorated more can be ignored.
When, after operating current standardization, n thrown by I measurement dish1, n thrown by ii measurement dish2, n thrown by ii I measurement dish3, n thrown by iv measurement dish4, switch K throws to the left side, and being at this moment positioned between two terminals of measurement voltage is:
UX=10 × 0.01n1+1×0.01n2+0.1×0.01n3+0.01×0.01n4(mv)
UX=0.1n1+0.01n2+0.001n3+0.0001n4(mv)
Potential difference meter working power to adopt YJ49 type high stability regulated power supply, operating current 11.11mA is relatively larger, adopting A-battery is what not stablize, this potential difference meter adopts relatively larger operating current and this smaller resistance of 0.01 Ω, when being to measure small voltage, reduce the requirement to current detector sensitivity.
In standard loop, for avoiding loop current excessive, adopt 200K Ω resistance R0Carrying out current limliting, owing to the electromotive force of unsaturated standard cell is discrete, between 1.0188V～1.0196V, standardized operating current is 11.11mA, therefore sets up resistance RNTake 91.7 Ω, additional 0～0.1 lockable adjustable resistance R of ΩP4, it is possible to the excursion of coverage criteria cell emf.
The standard operating current of potential difference meter is obtained by: 1mV standard signal voltage by polarity and potential difference meter " Ux" two measure terminal and connect, the total indicating value of each step disc of potential difference meter is identical with standard signal magnitude of voltage, and double-point double-throw switch K throws to the left side, adjustment adjustable resistance RP1, adjustable resistance RP2And adjustable resistance RP3, make galvanometer G nulling；Again double-point double-throw switch K is thrown to the right, regulate adjustable resistance RP4, make galvanometer G nulling, repeat after once, adjustable resistance RP4Locking, at this moment the operating current of potential difference meter is with regard to standardization, when instrument uses, first proofreads standard, when reading dial will be carried out reading, reading again after check and correction standard.
Claims (1)
1. there is a potential difference meter for four measurement disks, pass through the adjustable resistance R being made up of 21 4 Ω resistant series from the positive pole terminal of the external working power E of potential difference meter 11～12VP1, the adjustable resistance R that is made up of 21 0.2 Ω resistant seriesP2, and range of accommodation adjustable resistance R between 0～0.22 ΩP3, through four step discs, to 91.7 Ω set up resistance RN, then through the adjustable resistance R of 0～0.1 Ω lockable sliding contactP4Return to the negative pole terminal composition potential difference meter performance loop of the external working power E of potential difference meter 11～12V；From unsaturated standard cell ENPositive pole is connected to double-point double-throw switch K to 91.7 Ω of galvanometer G between two normally-closed contacts and sets up resistance RNAnd range of accommodation adjustable resistance R of lockable sliding contact between 0～0.1 ΩP4, then through 200K Ω resistance R0To unsaturated standard cell ENNegative pole composition potential difference meter standard loop；For connecting measured " UX" two terminals, positive pole terminal, after four measurement disks, forms potential difference meter to negative pole terminal compensate loop then through being connected to the double-point double-throw switch K of galvanometer G between two normally-closed contacts；nullIt 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，The resistance one that resistance is 0.01 Ω it is connected between each shelves contact of measurement dish I and replacement dish I '，" 0th " contact of measurement dish I is circuit node A，" 10th " contact of replacement dish I ' is circuit node B，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，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，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，Each contact on measurement dish II and replacement dish II ' in second step disc，Each contact on measurement dish III and replacement dish III ' in 3rd step disc，Each contact on measurement dish IV and replacement dish IV ' in 4th step disc，It is connected with the contact corresponding to replacement dish I ' of measurement dish I in the first step disc，The metal contact ring of the first step disc measurement dish I contacts the resistance R of interannular 999.9 Ω with the metal of replacement dish I '1Connecting, the metal contact ring of the second step disc measurement dish II contacts the resistance R of interannular 10K Ω with the metal of replacement dish II '2Connecting, the metal contact ring of the 3rd step disc measurement dish III contacts the resistance R of interannular 100K Ω with the metal of replacement dish III '3Connecting, the metal contact ring of the 4th step disc measurement dish IV contacts the resistance R of interannular 1000K Ω with the metal of replacement dish IV '4Connecting, the brush on each step disc measurement dish is Tong Bu when rotating with the brush on replacement dish, and " 0th " contact of measurement dish I and node A connect adjustable resistance RP3Cold end, " 10th " contact of replacement dish I ' and node B connect and set up resistance RNHot end, be used for connecting measured " UX" two measure terminals, positive pole terminal is connected with " 0th " contact of measurement dish I, and negative pole terminal is connected with " 10th " 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 |
|---|---|---|---|
| CN201410363533.6A CN104101761B (en) | 2014-07-24 | 2014-07-24 | Potential difference meter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410363533.6A CN104101761B (en) | 2014-07-24 | 2014-07-24 | Potential difference meter |
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| CN104101761A CN104101761A (en) | 2014-10-15 |
| CN104101761B true CN104101761B (en) | 2016-07-06 |
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| CN201410363533.6A Withdrawn - After Issue CN104101761B (en) | 2014-07-24 | 2014-07-24 | Potential difference meter |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106226575A (en) * | 2016-08-17 | 2016-12-14 | 杭州戎密科技有限公司 | A kind of DC potentiometer |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3119342A1 (en) * | 1981-05-15 | 1982-12-23 | Novotechnik Kg Offterdinger Gmbh & Co, 7302 Ostfildern | Device for the highly accurate determination of an input voltage |
| TW271469B (en) * | 1994-08-19 | 1996-03-01 | Ind Tech Res Inst | By testing resistance ratio by segment |
| DE19738050A1 (en) * | 1997-09-01 | 1999-03-04 | Itt Mfg Enterprises Inc | Circuit to generate and evaluate measurement signal from position sensor in form of potentiometer |
| CN101769951A (en) * | 2009-12-30 | 2010-07-07 | 富阳精密仪器厂 | Two-measuring-range potential difference meter with four metering panels |
| CN101776705A (en) * | 2009-12-30 | 2010-07-14 | 骆洪亮 | Potentiometer with four step plates |
| CN101788590A (en) * | 2008-08-28 | 2010-07-28 | 骆晓英 | Voltage measuring device |
| CN101788588A (en) * | 2008-08-28 | 2010-07-28 | 骆晓英 | Potentiometer |
| CN101788585A (en) * | 2008-08-28 | 2010-07-28 | 骆晓英 | Voltage measuring instrument with resolution of 0.01 Mu V |
| CN201555882U (en) * | 2009-12-14 | 2010-08-18 | 骆小君 | Multi-range voltage measuring device |
| CN201569687U (en) * | 2009-12-30 | 2010-09-01 | 方宁妹 | Potentiometer with four measuring discs |
| CN201569689U (en) * | 2009-12-30 | 2010-09-01 | 方宁妹 | DC potentiometer with four measuring discs |
| DE102010004638B3 (en) * | 2010-01-13 | 2011-06-30 | Abb Ag, 68309 | Potentiometer with main adjustment range and special function range and control / evaluation for this |
| CN204065208U (en) * | 2014-07-24 | 2014-12-31 | 袁乐香 | Potential difference meter |
-
2014
- 2014-07-24 CN CN201410363533.6A patent/CN104101761B/en not_active Withdrawn - After Issue
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3119342A1 (en) * | 1981-05-15 | 1982-12-23 | Novotechnik Kg Offterdinger Gmbh & Co, 7302 Ostfildern | Device for the highly accurate determination of an input voltage |
| TW271469B (en) * | 1994-08-19 | 1996-03-01 | Ind Tech Res Inst | By testing resistance ratio by segment |
| DE19738050A1 (en) * | 1997-09-01 | 1999-03-04 | Itt Mfg Enterprises Inc | Circuit to generate and evaluate measurement signal from position sensor in form of potentiometer |
| CN101788585A (en) * | 2008-08-28 | 2010-07-28 | 骆晓英 | Voltage measuring instrument with resolution of 0.01 Mu V |
| CN101788590A (en) * | 2008-08-28 | 2010-07-28 | 骆晓英 | Voltage measuring device |
| CN101788588A (en) * | 2008-08-28 | 2010-07-28 | 骆晓英 | Potentiometer |
| CN201555882U (en) * | 2009-12-14 | 2010-08-18 | 骆小君 | Multi-range voltage measuring device |
| CN101769951A (en) * | 2009-12-30 | 2010-07-07 | 富阳精密仪器厂 | Two-measuring-range potential difference meter with four metering panels |
| CN101776705A (en) * | 2009-12-30 | 2010-07-14 | 骆洪亮 | Potentiometer with four step plates |
| CN201569687U (en) * | 2009-12-30 | 2010-09-01 | 方宁妹 | Potentiometer with four measuring discs |
| CN201569689U (en) * | 2009-12-30 | 2010-09-01 | 方宁妹 | DC potentiometer with four measuring discs |
| DE102010004638B3 (en) * | 2010-01-13 | 2011-06-30 | Abb Ag, 68309 | Potentiometer with main adjustment range and special function range and control / evaluation for this |
| CN204065208U (en) * | 2014-07-24 | 2014-12-31 | 袁乐香 | Potential difference meter |
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| CN104101761A (en) | 2014-10-15 |
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