CN202453403U - Voltage gauge of 0.1muV resolution - Google Patents
Voltage gauge of 0.1muV resolution Download PDFInfo
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- CN202453403U CN202453403U CN2011205738023U CN201120573802U CN202453403U CN 202453403 U CN202453403 U CN 202453403U CN 2011205738023 U CN2011205738023 U CN 2011205738023U CN 201120573802 U CN201120573802 U CN 201120573802U CN 202453403 U CN202453403 U CN 202453403U
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- resistance
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- measuring disk
- disk
- measuring
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Abstract
The utility model discloses a voltage gauge of the 0.1muV resolution, which is used for voltage direct current voltage measurement. A first stepping plate of the voltage gauge consists of a measuring disk I consisting of twenty-three 1-omega resistors; a second stepping plate of voltage gauge respectively consists of a measuring disk II and a replacement disk II', wherein the measuring disk II consists of ten 0.1-omega resistors; a third stepping disk of the voltage gauge also consists of a measuring disk III and a replacement disk III', wherein the measuring disk III consists of ten 0.1-omega resistors; each contact of a fourth stepping disk and a fifth stepping disk is connected with a corresponding contact on the measuring disk III in the third stepping disk; and the fourth stepping disk and the fifth stepping disk do not need resistors. The voltage gauge is provided with two ranges and has a minimum resolution of 0.1muV. The second stepping disk adopts special wiring, voltage drop on an internal lead resistor of the voltage gauge is almost zero, and the influence of zero potential and thermoelectric potential can be ignored when the voltage gauge is used for measuring.
Description
Technical field
The utility model relates to the instrument that DC voltage is measured.
Background technology
Current for the pressure measuring instrument that five step discs are arranged, during rotary step switch, for the holding circuit resistance constant; Its five step discs all are made up of measuring disk and replacement dish; The stepping of some a pressure measuring instrument dish has also been used bracket panel, because bracket panel has been arranged, has increased the switch number of plies of step disc; Thereby increased the volume of instrument; Also make switch and apparatus structure become complicated, if particularly find that the step disc measurement data is overproof in the instrument verification process, the switch internal layer resistance that revise step disc bothers very much.Application number 200810121910.X discloses the pressure measuring instrument that five step discs are arranged and has separated the new method that never adopts bracket panel; Its five step discs all are made up of measuring disk and replacement dish; Do not contain bracket panel, on each measuring disk and the replacement dish resistance is arranged all, measuring disk and replacement dish on its five step discs have been formed bridge circuit in circuit; Its maximum defect is that error is not independent; In case the measuring disk point error of indication surpasses allowed band, just can't problem identificatioin come from which resistance, this makes troubles to identifying with maintenance.
The utility model content
The purpose of the utility model is a kind of pressure measuring instrument that five step discs are arranged of design, and it does not adopt bridge circuit, and error can be independent like this, and latter two step disc has only measuring disk, do not have resistance on the measuring disk, and this can reduce cost, and reduces the instrument volume.And adopt two ranges, make resolution reach 0.1 μ V.
The technical scheme of the utility model is taked like this: from pressure measuring instrument 3V working power positive pole through 40 Ω resistance R
0, the adjustable resistance R that constitutes by 21 2.5 Ω resistance
P1, the adjustable resistance R of range of adjustment between 0～2.7 Ω
P2, the adjustable resistance R of range of adjustment between 0～0.15 Ω
P3, get back to the negative pole composition pressure measuring instrument work loop of working power again through five step discs; Standard cell E
NAnodal through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Set up resistance R to 92.6 Ω
NAnd the adjustable resistance R of range of adjustment lockable sliding contact between 0～0.2 Ω
P4, pass through 150K Ω resistance R again
3To standard cell E
NNegative pole is formed the pressure measuring instrument standard loop; Be used to connect measured " U
X" two terminals, anodal terminal through five measuring disk after, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Form the pressure measuring instrument equalizing network to the negative pole terminal; It is characterized in that first step disc has measuring disk I; It has 0,1,2 ... 23 totally 24 gears; Except that the 0th, the 1st contact; All the other respectively keep off between the contact and to connect one of 1 Ω resistance, second step disc by have 0,1,2 ... 10 totally 11 gears measuring disk II with have 0,1,2 ... The 10 replacement dish II ' compositions of totally 11 gears, measuring disk II is except that the 0th, the 1st contact; Measuring disk II respectively keeps off with replacement dish II ' and is connected one of 0.1 Ω resistance between the contact; Measuring disk III that the 3rd step disc is made up of 10 0.1 Ω resistance and the replacement dish III ' that is made up of 10 0.1 Ω resistance form, the corresponding contact connection in each contact on the measuring disk V of the measuring disk IV of the 4th step disc, the 5th step disc and the 3rd step disc on the measuring disk, adjustable resistance R
P3Electronegative potential one end be circuit node C; Be divided into two-way behind the electric current process node C: the one tunnel connects the Metal Contact ring of replacement dish II ' in second step disc; Replacement dish II ' the 10th contact connects the 23rd contact of measuring disk I; The 1st contact of measuring disk I is through connecting the Metal Contact ring of measuring disk II behind one 1 Ω resistance, the 0th contact of measuring disk I connects the 10th contact of measuring disk II, and the 0th contact tie point of the 0th contact of measuring disk II and measuring disk III is circuit node A; The 1st contact of measuring disk II is through CC node A behind one 0.1 Ω resistance, and the Metal Contact ring of the measuring disk V of the 5th step disc is through 100K Ω resistance R
4The Metal Contact ring of back and measuring disk IV is through 10K Ω resistance R
5After be connected in circuit node B, the 10th contact of replacement dish III ' is through 999 Ω resistance R
6B is connected with circuit node, and circuit node A is through 112.486 Ω resistance R
3The CC Node B; Another road is through 124 Ω resistance R
1With 1116 Ω resistance R
2An end and single-pole double-throw switch (SPDT) K
1* 0.1 range contact connects 1116 Ω resistance R
2The other end be connected single-pole double-throw switch (SPDT) K with Node B
1* 1 range contact; Single-pole double-throw switch (SPDT) K
1Normally closed contact set up resistance R through 92.6 Ω
NWith adjustable resistance R
P4The back is connected with the negative pole of pressure measuring instrument working power; Be used to connect measured " U
X" two measure terminals, anodal terminal is connected with the Metal Contact ring of measuring disk I, the negative pole terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2The back is connected with the 10th contact of measuring disk III.
Through above technical scheme, first step disc need not the replacement dish, and the 4th, the 5th step disc is replacement dish not all; And four, all there is not resistance on the measuring disk of the 5th step disc; Five step disc errors are independent, and the error that back two dish synchronised forward (FWD)s come is consistent, and this brings convenience for debugging and maintenance; Also make pressure measuring instrument simple in structure, volume-diminished, thus reduced production cost; When five measuring disk resets of pressure measuring instrument, the internal wiring combined potential of pressure measuring instrument is an A point current potential, and some current potentials are " 0 ", so the zero potential of this pressure measuring instrument is very little.
Description of drawings
Accompanying drawing is the utility model schematic circuit.
In Fig. 1; The resistance of measuring disk II and last 10 * 0.1 Ω of replacement dish II ' in second step disc, each is made up of expression measuring disk II and replacement dish II ' the resistance of 10 0.1 Ω, in like manner last 23 * 1 Ω of measuring disk I; Expression measuring disk I form adjustable resistance R by 23 1 Ω resistance
P1The expression adjustable resistance R of last 21 * 2.5 Ω
P1Constitute by 21 2.5 Ω resistance.
In Fig. 1, thick black line is represented the Metal Contact ring on step disc and the temperature compensation dish, and hollow small circle is represented hard contact, and four-headed arrow is represented metallic brush.
Embodiment
Among Fig. 1, measuring disk II is identical with the resistance value of each stepping of replacement dish II ' in second step disc, all is 0.1 Ω, and the measuring disk II resistance that every stepping increases in circuit equals the resistance that the every stepping of replacement dish II ' reduces, so total resistance is constant in the circuit; The 3rd step disc comes holding circuit always to hinder invariance principle with second step disc with measuring disk III and replacement dish III '.
Being designed to 11mA during the standardization of pressure measuring instrument working current, when * 1 range, is 124 Ωs through five step discs to the Node B resistance from node C, from node C process resistance R
2The Node B resistance is 1240 Ω, five step discs so the 10mA working current is flowed through, the 1mA working current resistance R of flowing through
1, resistance R
2When * 0.1 range, be 124 Ωs through five step discs to the Node B resistance from node C, the 1116 Ω resistance R of connecting
2After resistance be 1240 Ω, five step discs so the 1mA working current is flowed through, the 10mA working current resistance R of flowing through
1
When * 1 range, pressure measuring instrument 10mA working current is divided into four the tunnel: the one tunnel through measuring disk IV through first, second step disc behind node A, and one the tunnel through measuring disk V, and another road is through the 3rd step disc, and one the tunnel through 112.486 Ω resistance R again
3, four road electric currents meet at Node B.Remove through resistance R
3Outside the branch road, each branch road resistance ratio: measuring disk V: measuring disk IV between node A, the Node B: the 3rd step disc=100: 10: 1, so, remove and flow through resistance R
3Outside the branch road, flow through that each branch current ratio is between node A, the Node B: measuring disk V: measuring disk IV: the 3rd step disc=1: 10: 100, remove resistance R
3Outside the branch road, resistance is 100K Ω/111 between node A, the Node B, lets the total current that flows through measuring disk V, measuring disk IV and the 3rd step disc be 1.11mA, flows through resistance R
3Electric current be 8.89mA, then 8.89mA * R
3=100K Ω/111 * 1.11mA, resistance R
3=112.486 Ω.Pressure measuring instrument 10mA working current is through resistance R
3Shunting makes that flowing through measuring disk V electric current is 0.01mA, and measuring disk IV electric current is 0.1mA, and the 3rd step disc electric current is 1mA; When each step disc is put different indicating value between node A and the Node B resistance change, resistance is used resistance R between node A and the Node B
ABExpression, each step disc resistance variable is X, then 1/R
AB=1/ (100K Ω+and X)+1/ (10K Ω+X)+1/1K Ω+889/100K Ω both sides differentiate: (1/R
AB{ 1/ (100K+X)+1/ (10K+X)+1/ (1000)+889/100K} ' of) '=
-R
AB′/R
AB 2＝{-1/(100K+X)
2-1/(10K+X)
2+0+0}
R
AB′＝{1/(100K+X)
2+1/(10K+X)
2}R
AB 2
R
ABDerivative be on the occasion of, so when the 3rd step disc resistance variable increases, total resistance R between node A and the Node B
ABIncrease.Resistance minimum between node A and Node B during each step disc reset indicating value, at this moment resistance is 100 Ω between node A, the B, resistance R between node A and Node B when each step disc is put " 10 " indicating value
ABMaximum, at this moment resistance R between node A, the B
ABBe about 100.002 Ω, than minimum indicating value big 2/100000ths, therefore, when the pressure measuring instrument precision was not higher than 2/10000ths, no matter what indicating value each step disc put, change in resistance can be ignored between node A, the B.
In standard loop, excessive for avoiding loop current, adopt 150K Ω resistance R
3Come current limliting, because the electromotive force of unsaturated standard cell disperses, between 1.0188V～1.0196V, standardized working current is 11mA, therefore sets up resistance R
NGet 92.6 Ω, add the lockable adjustable resistance R of 0～0.2 Ω
P4, variation range that can the coverage criteria cell emf.
The standard operation electric current of pressure measuring instrument is such acquisition: press polarity and pressure measuring instrument " U to 200mV standard signal voltage
x" two measure terminal and connect, the total indicating value of each step disc of pressure measuring instrument is identical with the standard signal magnitude of voltage, double-point double-throw switch K
2Throw to the left side, regulate adjustable resistance R
P1, R
P2And adjustable resistance R
P3, make galvanometer G nulling; Again with double-point double-throw switch K
2Throw to the right, regulate adjustable resistance R
P4, make galvanometer G nulling, repeat once again after, adjustable resistance R
P4Locking, at this moment the working current of pressure measuring instrument is with regard to standardization.
Electromotive force was about 1.65V when A-battery was new, and to 1.4V when following, the electric current shakiness can both make the working current of voltage-measuring equipment be adjusted to standardization in order to make A-battery under new, former affection condition, for this reason resistance R with old
0Get 40 Ω, the adjustable resistance R of coarse adjustment
P1Constitute the adjustable resistance R of middle accent by 21 2.5 Ω resistance
P2Get range of adjustment between 0～2.7 Ω, the adjustable resistance R of fine tuning
P3Get range of adjustment between 0～0.15 Ω, like this, when working power voltage during at 2.7～3.3V, can be adjusted in 11mA to working current through regulating adjustable resistance, working power can adopt two groups of A-battery series-feds, also can external power supply.
Claims (1)
1. the pressure measuring instrument of a μ V resolution, from pressure measuring instrument 3V working power positive pole through 40 Ω resistance R
0, the adjustable resistance R that constitutes by 21 2.5 Ω resistance
P1, the adjustable resistance R of range of adjustment between 0～2.7 Ω
P2, the adjustable resistance R of range of adjustment between 0～0.15 Ω
P3, get back to the negative pole composition pressure measuring instrument work loop of working power again through five step discs; Standard cell E
NAnodal through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Set up resistance R to 92.6 Ω
NAnd the adjustable resistance R of range of adjustment lockable sliding contact between 0～0.2 Ω
P4, pass through 150K Ω resistance R again
3To standard cell E
NNegative pole is formed the pressure measuring instrument standard loop; Be used to connect measured " U
X" two terminals, anodal terminal through five measuring disk after, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Form the pressure measuring instrument equalizing network to the negative pole terminal; It is characterized in that first step disc has measuring disk I; It has 0,1,2 ... 23 totally 24 gears; Except that the 0th, the 1st contact; All the other respectively keep off between the contact and to connect one of 1 Ω resistance, second step disc by have 0,1,2 ... 10 totally 11 gears measuring disk II with have 0,1,2 ... The 10 replacement dish II ' compositions of totally 11 gears, measuring disk II is except that the 0th, the 1st contact; Measuring disk II respectively keeps off with replacement dish II ' and is connected one of 0.1 Ω resistance between the contact; Measuring disk III that the 3rd step disc is made up of 10 0.1 Ω resistance and the replacement dish III ' that is made up of 10 0.1 Ω resistance form, the corresponding contact connection in each contact on the measuring disk V of the measuring disk IV of the 4th step disc, the 5th step disc and the 3rd step disc on the measuring disk, adjustable resistance R
P3Electronegative potential one end be circuit node C; Be divided into two-way behind the electric current process node C: the one tunnel connects the Metal Contact ring of replacement dish II ' in second step disc; Replacement dish II ' the 10th contact connects the 23rd contact of measuring disk I; The 1st contact of measuring disk I is through connecting the Metal Contact ring of measuring disk II behind one 1 Ω resistance, the 0th contact of measuring disk I connects the 10th contact of measuring disk II, and the 0th contact tie point of the 0th contact of measuring disk II and measuring disk III is circuit node A; The 1st contact of measuring disk II is through CC node A behind one 0.1 Ω resistance, and the Metal Contact ring of the measuring disk V of the 5th step disc is through 100K Ω resistance R
4The Metal Contact ring of back and measuring disk IV is through 10K Ω resistance R
5After be connected in circuit node B, the 10th contact of replacement dish III ' is through 999 Ω resistance R
6B is connected with circuit node, and circuit node A is through 112.486 Ω resistance R
3The CC Node B; Another road is through 124 Ω resistance R
1With 1116 Ω resistance R
2An end and single-pole double-throw switch (SPDT) K
1* 0.1 range contact connects 1116 Ω resistance R
2The other end be connected single-pole double-throw switch (SPDT) K with Node B
1* 1 range contact; Single-pole double-throw switch (SPDT) K
1Normally closed contact set up resistance R through 92.6 Ω
NWith adjustable resistance R
P4The back is connected with the negative pole of pressure measuring instrument working power; Be used to connect measured " U
X" two measure terminals, anodal terminal is connected with the Metal Contact ring of measuring disk I, the negative pole terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2The back is connected with the 10th contact of measuring disk III.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205738023U CN202453403U (en) | 2011-12-30 | 2011-12-30 | Voltage gauge of 0.1muV resolution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205738023U CN202453403U (en) | 2011-12-30 | 2011-12-30 | Voltage gauge of 0.1muV resolution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202453403U true CN202453403U (en) | 2012-09-26 |
Family
ID=46869258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205738023U Expired - Fee Related CN202453403U (en) | 2011-12-30 | 2011-12-30 | Voltage gauge of 0.1muV resolution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202453403U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967743A (en) * | 2012-12-07 | 2013-03-13 | 浙江工商大学 | Direct-current potentiometer beneficial to management of instrument production enterprise |
| CN102998504A (en) * | 2012-12-07 | 2013-03-27 | 浙江工商大学 | Potentiometer beneficial to management of instrument manufacturing enterprises |
| CN103760398A (en) * | 2011-12-30 | 2014-04-30 | 孙笑声 | 0.1 micro V-resolution voltage measuring instrument |
-
2011
- 2011-12-30 CN CN2011205738023U patent/CN202453403U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103760398A (en) * | 2011-12-30 | 2014-04-30 | 孙笑声 | 0.1 micro V-resolution voltage measuring instrument |
| CN102967743A (en) * | 2012-12-07 | 2013-03-13 | 浙江工商大学 | Direct-current potentiometer beneficial to management of instrument production enterprise |
| CN102998504A (en) * | 2012-12-07 | 2013-03-27 | 浙江工商大学 | Potentiometer beneficial to management of instrument manufacturing enterprises |
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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: 20120926 Termination date: 20141230 |
|
| EXPY | Termination of patent right or utility model |