CN1818675B - Two-measuring range potential difference meter by split branch - Google Patents
Two-measuring range potential difference meter by split branch Download PDFInfo
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- CN1818675B CN1818675B CN 200510062370 CN200510062370A CN1818675B CN 1818675 B CN1818675 B CN 1818675B CN 200510062370 CN200510062370 CN 200510062370 CN 200510062370 A CN200510062370 A CN 200510062370A CN 1818675 B CN1818675 B CN 1818675B
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- resistance
- measuring disk
- range
- replacement
- brush
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Abstract
A two-range potential difference meter of distributary branch type consists of the first measuring plate of 20*10omega, the second measuring plate of 10*1.1 omega, the third measuring plate of 0-12.1omega in slide-wire form .It features that two measuring ends of said meter are directly connected to three plates by wires except conversion switch and two resistances of 30 omega and 243 omega as well as distributary branch method are applied to carry out range conversion.
Description
Technical field
The present invention relates to measure the instrument of DC voltage.
Background technology
The potential difference meter of current production, when measuring disk has three when above, measure between terminal for two and have switch contact resistance and variation, therefore, even working current is little of 0.1mA, the silver-bearing copper compound substance is not only adopted in the brush of switch and contact, contact area is also done very greatly, variation is brought influence when reducing the measuring switch stepping and switching, and this just makes the instrument volume become big, the thermoelectrical potential that also has switch in addition with contact variable thermoelectric potential influence.
Summary of the invention
The problem to be solved in the present invention is, when being used for measure portion in the potential difference meter two step discs, a slide wire disc arranged, contact resistance and variation that the measuring switch stepping is switched, the switch thermoelectrical potential does not influence measurement result, when range was changed, range conversion was the resistance that one digit number is taken advantage of 10 integral number power with resistance.
Technical scheme of the present invention is such: it has working current to regulate resistance R P
1, RP
2, reduce the fixed resistance R of supply voltage
0, 1018 Ω of sampling usefulness set up resistance R N and the adjustable resistance RP of range of adjustment between 0～2 Ω during to standard
3, and metering circuit is connected in the potential difference meter work loop; It is characterized in that metering circuit has two step discs and a two slide wire disc, first step disc is by respectively having 20 * 10 Ω I measuring disk and the I ' replacement dish to form, second step disc is made up of II measuring disk that 10 * 1.1 Ω are respectively arranged and the II ' replacement dish, the measuring disk brush of second step disc and replacement dish brush are connected to each other, the 3rd dish is two slide wire discs, two slide wire resistance silk resistances are identical: top is all 0 Ω, end is all 12.1 Ω, the indicating value index dial of two slide wire discs has 11 big lattice, the corresponding resistance of every big lattice is 1.1 Ω, and 110 little lattice are arranged; Make III measuring disk slip for one in two slips, another root is made the III ' replacement dish slip, and the brush on two slide wire resistances of two slide wire discs is from the interconnected brush that gets off with a slice metal upper punch; The I ' replacement is coiled at the 20th and is connected 64.9 Ω resistance R
1The back is coiled at the 10th with the II ' replacement and is connected, and the 0th of II measuring disk connects 21.1 Ω resistance R
2The back is connected with the 0th of I measuring disk, and the 20th of I measuring disk connects III measuring disk slip end, and it is 2757.9 Ω resistance R that the III ' replacement dish slip top connects a resistance
3The back is coiled at the 0th with the I ' replacement and is connected; The I ' replacement dish brush and 30 Ω resistance r
1Be connected in parallel on potential difference meter metering circuit positive pole, resistance r
1The other end connect triac device K
1-1* 0.1 range contact, K
1-1* 1 range contact connects I measuring disk brush, K
1-1* 1 range contact and K
1-2* 0.1 range contact short circuit, K
1-2* 243 Ω resistance r are passed through in 0.1 range contact
2Back and K
1-2* 1 range contact connects K
1-2* 1 range contact is connected triac device K with the hot end of setting up resistance R N
1-1, K
1-2Two normally closed contact short circuits; Potential difference meter is used to connect measured U
xTwo terminals, anodal terminal is connected with the 10th of II measuring disk, and the negative pole terminal is by galvanometer change-over switch K
2Be connected with III measuring disk slip top.
By above technical scheme, the measuring disk that two step discs and slide wire disc are used for measure portion connects with lead, contact resistance and variation be not in measuring the loop, 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, supply voltage is a volt, and how many μ V are thermoelectrical potential be, both differ 10 the 6 power orders of magnitude, therefore influence can be ignored, even so, even contact resistance variation and thermoelectric potential influence are big to the degree of can not ignore, can be by standard be adjusted RP
2Resistance obtain revising, zero potential can increase between slide wire disc and the I measuring disk lead resistance to be revised, Just because of this, reduced requirement to switch, after adopting small-sized measurement step switch, it is many that whole instrument overall dimensions reduce, and makes the measurement data of instrument obtain good repeatability.Because the range conversion is that one digit number is taken advantage of 10 integral number power with resistance, available standards resistance is revised with the resistance resistance the range conversion, has improved the accuracy of potential difference meter range ratio.
Description of drawings
Accompanying drawing is a principle of the invention circuit.
Embodiment
In the drawings, by " U
x" anodal through each measuring disk, pass through change-over switch K again
2To " U
x" negative pole is to measure the loop, by positive source through measuring step switch to setting resistance R N and adjustable resistance RP
3, arrive resistance R then
0, adjustable resistance RP
2And RP
1After, getting back to power cathode is the work loop, anodal through change-over switch K from standard cell EN
2, to setting up resistance R N and adjustable resistance RP
3, be standard loop to the standard cell negative pole again.When three dishes are all thrown " 0 ", left side resistance equals 297 Ω between two brushes of first step disc, and the right resistance equals 2970 Ω, and total resistance is 270 Ω between two brushes of first step disc, therefore 10/11 on the left side of total current flows between two brushes of first dish, and 1/11 flows on the right.
When * 0.1 range, be connected in parallel on the resistance r between two brushes of first step disc
1Resistance be between two brushes of first dish resistance 1/9, so flow through the electric current of measuring disk and be * the 1st, 1/10 of range, therefore the amount limit be reduced to * 1 range 1/10, parallel resistance r
1After, the metering circuit resistance is reduced, resistance r has just connected in circuit
2, make the total resistance of potentiometer circuit constant.
The 1mA working current is to determine like this, at " U
x" two of two ends measure terminals and connect normal voltage near full scale, K switch by polarity
2Throw to the left side, the measuring disk indicating value is identical with standard voltage value, regulates resistance R P by regulating working current
1And RP
2, make the galvanometer nulling, again with K switch
2Throw to the right, sampling is 1018 Ω with the resistance of setting up resistance R N, and 0～2 Ω adjustable resistance RP has connected
3, regulate RP
3, make galvanometer nulling once more, again with K switch
2Throw to the left side, regulate RP
2Make the galvanometer nulling, again with K switch
2Throw to the right and regulate RP
3Make the galvanometer nulling, when switch points to the left side and the right and do not regulate the equal nulling of galvanometer, the standardization of potential difference meter working current is described, promptly set up ohmically pressure drop and equate, at this moment with RP with the electromotive force of unsaturated standard cell EN
3Locking, this potential difference meter is from now on just as standard.After the working current standardization, the I measuring disk is thrown n when * 1 range
1, the II measuring disk is thrown n
2, the III measuring disk is thrown n
3, K switch
2Throw to the left side, be positioned at this moment that voltage is between two terminals of measurement
Ux＝10/11+1.1n
2+10/11×(20+1.1)+10/11×10n
1-1/11×10×(20-n
1)-1/11
×1.1(10-n
3)(mv)
＝n
2+200/11+1+100n
1/11-200/11+10n
1/11-1+0.1n
3(mv)
＝10n
1+n
2+0.1n
3(mv)
More than the resistance of III dish calculate n by big lattice
3Be expressed as an integer and add the radix point back and have one-bit digital to refer to little lattice in the big lattice, little lattice indicating value unit is 10 μ V during * 1 range, is 1 μ V when * 0.1 range.
Convenient in order to measure, the III dish has a big lattice negative potential.
Circuit work power is 1.5V, can work in the 1.4V-1.65V scope in order to make operating supply voltage, gets fixed resistance R
0Equal 110 Ω, adjustable resistance PR
1=20 * 12 Ω, PR
2Be to regulate in 0～13 Ω scope.
Triac device K
1-3To resistance R
4And resistance R
5Switch in difference amount limit, purpose is to mate in different range input impedance for galvanometer G.
Claims (1)
1. two-range potentiometer that adopts diverter branch, it has working current to regulate resistance R P
1, RP
2, reduce the fixed resistance R of supply voltage
0, 1018 Ω of sampling usefulness set up resistance R N and the adjustable resistance RP of range of adjustment between 0～2 Ω during to standard
3, and metering circuit is connected in the potential difference meter work loop; It is characterized in that metering circuit has two step discs and a two slide wire disc, first step disc is by respectively having 20 * 10 Ω I measuring disk and the I ' replacement dish to form, second step disc is made up of II measuring disk that 10 * 1.1 Ω are respectively arranged and the II ' replacement dish, the measuring disk brush of second step disc and replacement dish brush are connected to each other, the 3rd dish is two slide wire discs, two slide wire resistance silk resistances are identical: top is all 0 Ω, end is all 12.1 Ω, the indicating value index dial of two slide wire discs has 11 big lattice, the corresponding resistance of every big lattice is 1.1 Ω, and 110 little lattice are arranged; Make III measuring disk slip for one in two slips, another root is made the III ' replacement dish slip, and the brush on two slide wire resistances of two slide wire discs is from the interconnected brush that gets off with a slice metal upper punch; The I ' replacement is coiled at the 20th and is connected 64.9 Ω resistance R
1The back is coiled at the 10th with the II ' replacement and is connected, and the 0th of II measuring disk connects 21.1 Ω resistance R
2The back is connected with the 0th of I measuring disk, and the 20th of I measuring disk connects III measuring disk slip end, and it is 2757.9 Ω resistance R that the III ' replacement dish slip top connects a resistance
3The back is coiled at the 0th with the I ' replacement and is connected; The I ' replacement dish brush and 30 Ω resistance r
1Be connected in parallel on potential difference meter metering circuit positive pole, resistance r
1The other end connect triac device K
1-1* 0.1 range contact, K
1-1* 1 range contact connects I measuring disk brush, K
1-1* 1 range contact and K
1-2* 0.1 range contact short circuit, K
1-2* 243 Ω resistance r are passed through in 0.1 range contact
3Back and K
1-2* 1 range contact connects K
1-2* 1 range contact is connected triac device K with the hot end of setting up resistance R N
1-1, K
1-3Two normally closed contact short circuits; Potential difference meter is used to connect measured U
XTwo terminals, anodal terminal is connected with the 10th of II measuring disk, and the negative pole terminal is by galvanometer change-over switch K
2Be connected with III measuring disk slip top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510062370 CN1818675B (en) | 2005-12-30 | 2005-12-30 | Two-measuring range potential difference meter by split branch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510062370 CN1818675B (en) | 2005-12-30 | 2005-12-30 | Two-measuring range potential difference meter by split branch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1818675A CN1818675A (en) | 2006-08-16 |
| CN1818675B true CN1818675B (en) | 2010-04-07 |
Family
ID=36918769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510062370 Expired - Fee Related CN1818675B (en) | 2005-12-30 | 2005-12-30 | Two-measuring range potential difference meter by split branch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1818675B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4476540A (en) * | 1981-05-27 | 1984-10-09 | Snecma | Non-linear function generator |
| CN1425923A (en) * | 2001-12-08 | 2003-06-25 | 骆乃光 | Multiple measuring range DC potential difference meter |
| CN1673755A (en) * | 2005-04-22 | 2005-09-28 | 骆乃光 | Potential difference meter with seven bit reading |
-
2005
- 2005-12-30 CN CN 200510062370 patent/CN1818675B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4476540A (en) * | 1981-05-27 | 1984-10-09 | Snecma | Non-linear function generator |
| CN1425923A (en) * | 2001-12-08 | 2003-06-25 | 骆乃光 | Multiple measuring range DC potential difference meter |
| CN1673755A (en) * | 2005-04-22 | 2005-09-28 | 骆乃光 | Potential difference meter with seven bit reading |
Non-Patent Citations (2)
| Title |
|---|
| 刘浙华.高精度双量程桥式电位差计.实用测试技术 3.1995,(3),39-42. * |
| 李德亨.直流电位差计的三个回路.计量与测试技术 1.2000,(1),25-26. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1818675A (en) | 2006-08-16 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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Granted publication date: 20100407 Termination date: 20101230 |