CN101393236B - Potential difference meter - Google Patents
Potential difference meter Download PDFInfo
- Publication number
- CN101393236B CN101393236B CN2008101219114A CN200810121911A CN101393236B CN 101393236 B CN101393236 B CN 101393236B CN 2008101219114 A CN2008101219114 A CN 2008101219114A CN 200810121911 A CN200810121911 A CN 200810121911A CN 101393236 B CN101393236 B CN 101393236B
- Authority
- CN
- China
- Prior art keywords
- measuring disk
- resistance
- replacement
- brush
- step disc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention provides a potentiometer for measuring direct current voltage. The potentiometer comprises four step panels and a double wire sliding panel, the five panels consist of a measurement panel and a substitution panel with the same resistance value, working current is divided into two branches with the ration of ten to one between two electric brushes in the first step panel, and two panels of each branch are in parallel connection and have the same current; except the first step panel, electric brushes of measurement panels of other four step panels and the electric brush of the substitution panel are connected by resistors or conducting wires, neither each step panel nor the double wire sliding panel is provided with a bracket panel, thus the size of the instrument is reduced and the production cost is reduced. Meanwhile, the five measurement panels are connected through conducting wires, so the influence from deviation and thermoelectricity is eliminated.
Description
Technical field
The present invention relates to instrument that DC voltage is measured.
Background technology
Application number 2005100623569,2005100622373,2005100622585 etc. discloses the potential difference meter that five step discs is arranged or two slide wire discs are arranged; Each is made up of its second, third step disc measuring disk, replacement dish and bracket panel; Measuring disk is identical with resistance on the replacement dish, resistance of the every increase of measuring disk, and the replacement dish just reduces same resistance; When second step disc puts at the 0th; Second step disc equates that with the 3rd step disc parallel connection part resistance when the 3rd step disc was put different indicating value, the circuit resistance was constant.Decline when " 0 " when second step disc, the 3rd step disc is put different indicating values, and the circuit resistance is not having III " resistance changes during bracket panel; stepping of the every increase of the 3rd step disc, circuit resistance can increase the half the resistance of each stepping resistance, for the total resistance of holding circuit constant; at III " each stepping of bracket panel reduces same resistance; Resistance is minimum when second step disc puts at the 0th, at this moment lets III " bracket panel resistance all seals in circuit, makes the circuit resistance constant.Because first step disc and two slide wire disc are formed by resistance identical measuring disk and replacement dish, so what indicating value no matter four dishes put, circuit always hinders constant.Second step disc is except that having measuring disk, replacement dish for this reason; Having increased bracket panel distinguishes step disc and puts the 0th and the circuit of declining the 0 0th. two kind of situation and connect; The 3rd step disc has also increased bracket panel, has 10 resistance to come to insert respectively or cut out several resistance above and makes the total resistance of circuit constant.Four, the 5th dish has also in like manner had bracket panel.
Because second, third, the 4th, the 5th step disc all has bracket panel; Increased the number of plies of switch; Thereby increased the volume of instrument; Also make switch and apparatus structure become complicated, if particularly find second, third in the instrument verification process, the 4th, the 5th step disc measurement data is overproof, revise second, third, the internal layer resistance of the 4th, the 5th step disc switch bothers very much.
Summary of the invention
The objective of the invention is to design a kind of potential difference meter that four step discs, two slide wire discs are arranged; In the connection of a measuring disk slip of four measurement disks, do not switch through switch; Four step discs, two slide wire discs are all cancelled bracket panel, and the volume that this can reduce instrument reduces production costs.
Technical scheme of the present invention is to take like this:
Its 4.5V working power anodal with first step disc on replacement dish brush is connected, the measuring disk brush on first step disc is through 1018 Ω setting resistance R N and range of adjustment 1058 Ω resistance R through connecting successively together again behind the adjustable resistance RP3 of 0～2 Ω
0, 0～35 Ω adjustable resistance R
P2, 22 * 33 Ω adjustable resistance R
P1The back is connected with the 4.5V working power negative pole of potential difference meter, and standard cell EN positive pole is through being connected to the double-point double-throw switch K of galvanometer G, to setting up resistance R N and lockable adjustable resistance R between two normally closed contacts
P3, arrive the standard loop that the standard cell negative pole is formed potential difference meter again, be used to connect " the U of measuring junction
X" two terminals, anodal terminal is through measuring disk, the measuring disk on the 3rd step disc, 191.31 Ω resistance R on second step disc of series connection successively
3, behind the measuring disk slip on the measuring disk on first step disc, the measuring disk on the 4th step disc, the 5th dish, again through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts equalizing network to negative pole terminal composition potential difference meter; It is characterized in that between the replacement dish brush and the measuring disk brush on first step disc on first step disc except that first, second, third, fourth step disc is arranged, also having the promptly two slide wire discs of the 5th dish; First step disc is made up of I measuring disk that 20 * 100 Ω are respectively arranged and the I ' replacement dish; Second step disc is made up of II measuring disk that 10 * 22 Ω are respectively arranged and the II ' replacement dish; The brush of measuring disk is connected through lead with the brush of replacement dish on second step disc; The 3rd step disc is made up of III measuring disk that 10 * 2.2 Ω are respectively arranged and the III ' replacement dish, and the brush of the brush of measuring disk and replacement dish is through 242 Ω resistance R on the 3rd step disc
1Connect, the 4th step disc is made up of IV measuring disk that 10 * 2.2 Ω are respectively arranged and the IV ' replacement dish, and the brush of the brush of measuring disk and replacement dish is through 24.2 Ω resistance R on the 4th step disc
2Connect, the 5th dish is two slide wire discs, and two slide wire resistance Standard resistance ranges all are 0～2.2 Ω; Be that top is 0 Ω, end is 2.2 Ω, and wherein one is V measuring disk slip; Another root is a V ' replacement dish slip, and the index dial of two slide wire discs indicates 0,1,2 ... 10 big lattice of 100 one indicating value points, every big lattice are not marked numeral equally distributed 10 little lattice; The corresponding resistance of every big lattice is 0.22 Ω, " 0 " indicating value of two slide wire disc index dials, dish slip of the V ' replacement just and V measuring disk slip the 0th point; Top on the i.e. brush of the two slide wire discs contact slide wire resistance; The index dial of two slide wire discs " 10 " indicating value, dish slip of the V ' replacement just and V measuring disk slip the 10th point, i.e. end on the brush of the two slide wire discs contact slide wire resistance; Brush on two slide wire resistances is with a slice sheet metal; The I ' replacement is coiled at the 20th and is connected the III ' replacement and coil the 10th point, and the III ' replacement is coiled at the 0th and connected the II ' replacement and coil the 10th point, and the 0th of II measuring disk connects III measuring disk the 10th point, and III measuring disk the 0th o'clock is through one 191.31 Ω resistance R
3The back is connected with the 0th of I measuring disk, and the I ' replacement coils at the 0th o'clock through one 21309 Ω resistance R
4The back is coiled at the 0th with the IV ' replacement and is connected, and the IV ' replacement is coiled at the 10th and connected the V ' replacement dish slip the 0th point, the 10th connection of V measuring disk slip IV measuring disk the 0th point, and the 10th of IV measuring disk is connected with the 20th of I measuring disk; It is anodal that the I ' replacement dish brush connects the potential difference meter working power, and I measuring disk brush connects sets up resistance R N hot end; Connect measured " U
X" two terminals, anodal terminal connects II measuring disk the 10th point, and the negative pole terminal is connected with the 0th of V measuring disk slip after through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts.
Through above technical scheme, four step discs and two slide wire discs are all without bracket panel, and this makes potential difference meter simple in structure, and volume-diminished, whole instrument overall dimensions reduce many, have also reduced production cost; The measuring disk that instrument is used for measure portion connects with lead; Contact resistance and variation be not in equalizing network, and the just potential difference meter work loop of influence always hinders, because total resistance resistance is very big; So variation can be ignored; The thermoelectric potential influence of several μ V be supply voltage, therefore influence can be ignored, zero potential can increase between slide wire disc and the I measuring disk lead resistance and revise.
Description of drawings
Fig. 1 is a kind of schematic circuit of the present invention.
Embodiment
In Fig. 1, when two slide wire discs of four step discs and all during reset, left side resistance value equals 2334.31 Ω between two brushes of first step disc; The right resistance value equals 23343.1 Ω; Therefore, between two brushes of first step disc flow in 10/11 left side of total current, flows in 1/11 the right.When each step disc was put other contact, the resistance that measuring disk increases in each step disc equaled the resistance that the replacement dish reduces, so what indicating value no matter four step discs, two slide wire discs put, left and right limit resistance value is constant between two brushes of first step disc.
Potential difference meter standard operation electric current is 1mA; Left side electric current 10/11mA between two brushes of first step disc; The right electric current 1/11mA; Left side electric current is divided into two branch roads that electric current equates after flowing to the contact that contacts with the III ' replacement dish brush, and one the tunnel through the III ' replacement dish brush, resistance 242 Ω resistance R
1, to the contact that contact with III measuring disk brush, the contact that contacts with III measuring disk brush is arrived after through second step disc in another road, two branch road resistance values all are 242 Ω, therefore, the electric current on two branch roads all is 5/11mA.The right electric current also is divided into two branch roads that electric current equates after flowing to the contact that contacts with the IV ' replacement dish brush, and one the tunnel through the IV ' replacement dish brush, resistance 24.2 Ω resistance R
2, to the contact that contact with IV measuring disk brush, the contact that contacts with IV measuring disk brush is arrived after through two slide wire discs in another road, two branch road resistance values all are 24.2 Ω, therefore, the electric current on two branch roads all is 0.5/11mA.
After the working current standardization, the I measuring disk is thrown n
1, the II measuring disk is thrown n
2, the III measuring disk is thrown n
3, the IV measuring disk is thrown n
4, two slide wire discs are thrown n
5(n is certain big lattice indicating value), K switch is thrown to the left side, is positioned at this moment that voltage is between two terminals of measurement:
U
X＝5/11×22n
2+5/11×(10×2.2)+5/11×2.2n
3+10/11×191.31+10/11×100n
1-1/11×(20-n
1)
×100-1/11×(10-n
4)×2.2-0.5/11×2.2n
4-0.5/11×(10-n
5)×0.22(mv)
＝10n
2+10+n
3+10/11×191.31+1000n
1/11-2000/11+100n
1/11-2+0.2n
4-0.1n
4-0.1+0.01n
5(mv)
＝+100n
1+10n
2+n
3+0.1n
4+0.01n
5+10/11×191.31-2000/11-2-0.1+10(mv)
＝100n
1+10n
2+n
3+0.1n
4+0.01n
5 (mv)
Internal attachment standard is calibration like this: at " U
x" two of two ends measure terminals and connect 2V normal voltage signal by polarity, K switch is thrown to the left side, the measuring disk indicating value is identical with standard voltage value, through regulating working current adjusting resistance R
P1And R
P2, make the galvanometer nulling, again K switch to be thrown to the right, sampling is 1018 Ω with the resistance of setting up resistance R N, 0～2 Ω adjustable resistance R has connected
P3, regulate adjustable resistance R
P3, make galvanometer nulling once more, again K switch is thrown to the left side, regulate adjustable resistance R
P2, make the galvanometer nulling, again K switch is thrown to the right, regulate adjustable resistance R
P3Make the galvanometer nulling, throw to the left side and throw when the equal nulling of galvanometer is not regulated on the right when K switch, the working current that potential difference meter is described is with regard to standardization; Promptly set up ohmically pressure drop and equate, at this moment with adjustable resistance R with the electromotive force of unsaturated standard cell EN
P3Locking, this potential difference meter is from now on just as standard.
The DC potentiometer WV is 1.5V; Because the every joint stable electrical of dry cell kinetic potential is between 1.4V～1.65V; Adopt three groups of dry cell series connection, all can adjust to standard state to the DC potentiometer working current at 4.2V～4.95V, get fixed resistance R for realizing supply voltage
0=1058 Ω, adjustable resistance R
P1=22 * 33 Ω, adjustable resistance R
P2Range of adjustment is between 0～35 Ω.
Claims (1)
1. potential difference meter, its 4.5V working power anodal with first step disc on replacement dish brush be connected, the measuring disk brush on first step disc is through 1018 Ω setting resistance R N and the range of adjustment adjustable resistance RP at 0～2 Ω
3After again through together 1058 Ω resistance R of series connection successively
0, 0～35 Ω adjustable resistance R
P2, 22 * 33 Ω adjustable resistance R
P1The back is connected with the 4.5V working power negative pole of potential difference meter, and standard cell EN positive pole is through being connected to the double-point double-throw switch K of galvanometer G, to setting up resistance R N and lockable adjustable resistance R between two normally closed contacts
P3, arrive the standard loop that the standard cell negative pole is formed potential difference meter again, be used to connect " the U of measuring junction
X" two terminals, anodal terminal is through measuring disk, the measuring disk on the 3rd step disc, 191.31 Ω resistance R on second step disc of series connection successively
3, behind the measuring disk slip on the measuring disk on first step disc, the measuring disk on the 4th step disc, the 5th dish, again through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts equalizing network to negative pole terminal composition potential difference meter; It is characterized in that between the replacement dish brush and the measuring disk brush on first step disc on first step disc except that first, second, third, fourth step disc is arranged, also having the promptly two slide wire discs of the 5th dish; First step disc is made up of I measuring disk that 20 * 100 Ω are respectively arranged and the I ' replacement dish; Second step disc is made up of II measuring disk that 10 * 22 Ω are respectively arranged and the II ' replacement dish; The brush of measuring disk is connected through lead with the brush of replacement dish on second step disc; The 3rd step disc is made up of III measuring disk that 10 * 2.2 Ω are respectively arranged and the III ' replacement dish, and the brush of the brush of measuring disk and replacement dish is through 242 Ω resistance R on the 3rd step disc
1Connect, the 4th step disc is made up of IV measuring disk that 10 * 2.2 Ω are respectively arranged and the IV ' replacement dish, and the brush of the brush of measuring disk and replacement dish is through 24.2 Ω resistance R on the 4th step disc
2Connect, the 5th dish is two slide wire discs, and two slide wire resistance Standard resistance ranges all are 0～2.2 Ω; Be that top is 0 Ω, end is 2.2 Ω, and wherein one is V measuring disk slip; Another root is a V ' replacement dish slip, and the index dial of two slide wire discs indicates 0,1,2 ... 10 big lattice of 100 one indicating value points, every big lattice are not marked numeral equally distributed 10 little lattice; The corresponding resistance of every big lattice is 0.22 Ω, " 0 " indicating value of two slide wire disc index dials, dish slip of the V ' replacement just and V measuring disk slip the 0th point; Top on the i.e. brush of the two slide wire discs contact slide wire resistance; The index dial of two slide wire discs " 10 " indicating value, dish slip of the V ' replacement just and V measuring disk slip the 10th point, i.e. end on the brush of the two slide wire discs contact slide wire resistance; Brush on two slide wire resistances is with a slice sheet metal; The I ' replacement is coiled at the 20th and is connected the III ' replacement and coil the 10th point, and the III ' replacement is coiled at the 0th and connected the II ' replacement and coil the 10th point, and the 0th of II measuring disk connects III measuring disk the 10th point, and III measuring disk the 0th o'clock is through one 191.31 Ω resistance R
3The back is connected with the 0th of I measuring disk, and the I ' replacement coils at the 0th o'clock through one 21309 Ω resistance R
4The back is coiled at the 0th with the IV ' replacement and is connected, and the IV ' replacement is coiled at the 10th and connected the V ' replacement dish slip the 0th point, the 10th connection of V measuring disk slip IV measuring disk the 0th point, and the 10th of IV measuring disk is connected with the 20th of I measuring disk; It is anodal that the I ' replacement dish brush connects the potential difference meter working power, and I measuring disk brush connects sets up resistance R N hot end; Connect measured " U
X" two terminals, anodal terminal connects II measuring disk the 10th point, and the negative pole terminal is connected with the 0th of V measuring disk slip after through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101219114A CN101393236B (en) | 2008-10-22 | 2008-10-22 | Potential difference meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101219114A CN101393236B (en) | 2008-10-22 | 2008-10-22 | Potential difference meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101393236A CN101393236A (en) | 2009-03-25 |
| CN101393236B true CN101393236B (en) | 2012-05-30 |
Family
ID=40493627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101219114A Expired - Fee Related CN101393236B (en) | 2008-10-22 | 2008-10-22 | Potential difference meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101393236B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101759B (en) * | 2014-07-24 | 2017-02-01 | 富阳兴远仪器仪表经营部 | Potentiometer with five stepping plates |
| CN108132368B (en) * | 2017-12-22 | 2021-02-05 | 广电计量检测（成都）有限公司 | Pure resistive load system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4810950A (en) * | 1986-07-17 | 1989-03-07 | Ob Products, Inc. | Load resistance measuring technique |
| CN1769912A (en) * | 2005-09-09 | 2006-05-10 | 骆乃光 | Three range DC potentiometer |
| CN1793981A (en) * | 2005-12-28 | 2006-06-28 | 骆乃光 | Three measuring range potential difference meter using divided branch |
| CN2833616Y (en) * | 2005-09-09 | 2006-11-01 | 骆乃光 | Three range transforming portable potentiometer |
-
2008
- 2008-10-22 CN CN2008101219114A patent/CN101393236B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4810950A (en) * | 1986-07-17 | 1989-03-07 | Ob Products, Inc. | Load resistance measuring technique |
| CN1769912A (en) * | 2005-09-09 | 2006-05-10 | 骆乃光 | Three range DC potentiometer |
| CN2833616Y (en) * | 2005-09-09 | 2006-11-01 | 骆乃光 | Three range transforming portable potentiometer |
| CN1793981A (en) * | 2005-12-28 | 2006-06-28 | 骆乃光 | Three measuring range potential difference meter using divided branch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101393236A (en) | 2009-03-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101393235B (en) | DC potentiometer | |
| CN101359002B (en) | Potential difference meter using sliding disk | |
| CN101354410B (en) | DC potential difference meter using slide wire tray | |
| CN101393236B (en) | Potential difference meter | |
| CN1818676B (en) | Single-measuring range potential difference meter with five reading digits | |
| CN201255748Y (en) | DC potential difference meter | |
| CN101813721B (en) | Pressure measuring instrument | |
| CN101788585B (en) | Voltage measuring instrument with resolution of 0.01 Mu V | |
| CN201247275Y (en) | Dc potential difference meter employing slide wire disk | |
| CN101788590B (en) | Voltage measuring device | |
| CN101788588B (en) | Potentiometer | |
| CN201247274Y (en) | Potential difference meter employing slide wire disk | |
| CN1991375A (en) | DC potentiometer employing sliding drum | |
| CN1991387A (en) | Direct current potentiometer having five scale readings | |
| CN101788589B (en) | Second-range DC potentiometer adopting slide wire disc | |
| CN101788586B (en) | DC potentiometer | |
| CN101813722B (en) | Three-range potential difference meter | |
| CN201269899Y (en) | Potential difference meter | |
| CN101788587B (en) | Voltage measuring instrument | |
| CN101788591B (en) | Three-range DC potentiometer adopting slide wire disc | |
| CN100386632C (en) | Three-measuring range DC potential difference meter with fiver reading digits and sliding wire disk | |
| CN100375901C (en) | Three-measuring range DC potential difference meter with five's place reading utilizing, shunt branch | |
| CN201569685U (en) | Voltage measuring apparatus | |
| CN201569694U (en) | Voltage measurement device | |
| CN201622297U (en) | DC voltage measuring instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120530 Termination date: 20131022 |