CN100386630C - Bimeasuring range pitantial difference mater using divided branch having five measuring discs - Google Patents
Bimeasuring range pitantial difference mater using divided branch having five measuring discs Download PDFInfo
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- CN100386630C CN100386630C CNB2005100622763A CN200510062276A CN100386630C CN 100386630 C CN100386630 C CN 100386630C CN B2005100622763 A CNB2005100622763 A CN B2005100622763A CN 200510062276 A CN200510062276 A CN 200510062276A CN 100386630 C CN100386630 C CN 100386630C
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Abstract
The present invention relates to a potential difference meter which has two measuring ranges, adopts a shunting branch circuit and five measuring discs, and is used for measuring the DC voltage. The potential difference meter is provided with a first measuring discs of 20*10 omega, a second measuring disc and a third measuring disc of 9*2.2 omega, and a fourth measuring disc and a fifth measuring disc of 10*0.022 omega, wherein resistors arranged on all measuring discs between two measuring end buttons are connected by conducting wires. When a measuring switch is switched in a stepping mode, the influence on a measuring result by the variation and the thermoelectrical potential of a contact resistor is eliminated. Therefore, the good repeatability can be achieved when the resolution is 0.1 muV. A resistance value adopted by a resistor used for converting the measuring ranges is the integer power of a one-digit number multiplied with ten, which is good for the accuracy of the measuring range ratio of the potentiometer.
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 measuring switch stepping switching, this just makes the instrument volume become big, nonetheless, can not make potential difference meter resolution little to 0.1 μ v, 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 the step switch that is used for measure portion in the potential difference meter has five, and contact resistance and variation that the measuring switch stepping is switched, the switch thermoelectrical potential does not influence measurement result, makes instrumental resolution reach 0.1 μ v.When range was changed, range conversion was the resistance that one digit number is taken advantage of 10 integral number power with resistance.
The employing technical scheme is: working current is regulated resistance R P
1, RP
2, RP
3And be used to reduce the fixed resistance R of supply voltage
0, sampling is with setting up resistance R N 1018 Ω and temperature compensation dish RP during to standard
420 * 0.05 Ω, and by first, second, third and fourth, resistance is formed on five, five step discs network is connected in the potential difference meter work loop, working current is 1mA when standardization; It is characterized in that first step disc is made up of I measuring disk and I ' replacement dish, 0～20 indicating value is provided, two resistance above the dish are 20 * 10 Ω, second step disc is by " 0 ", non-resistance between " 1 " two contacts, there is the II measuring disk of 9 * 2.2 Ω resistance 1～10 contact, II ' the replacement dish of 10 * 2.2 Ω reaches and is not connected to resistance, 0 contact is independent, the II that all the other contacts link to each other " the bracket panel composition; the 3rd step disc is by " 9 "; non-resistance between " 10 " two contacts; be the III measuring disk of 9 * 2.2 Ω resistance between 0～9 contact; III ' the replacement dish of 10 * 2.2 Ω and the 10th III that all the other each points of independence connect " the bracket panel composition, the 4th step disc is by all being that the IV measuring disk of 10 * 0.022 Ω resistance and IV ' replacement dish and resistance are the IV of 10 * 0.011 Ω " bracket panel forms; the 5th step disc is the V measuring disk of 10 * 0.022 Ω by resistance; V ' replacement dish and resistance are the V of 10 * 0.011 Ω " bracket panel forms, except that first step disc, the replacement dish of all the other four step discs and the brush of measuring disk are connected to each other; I ' replacement dish brush is connected in the metering circuit positive pole, and I ' replacement is coiled at the 20th and connected 64.779 Ω resistance R
1The back connects IV " bracket panel the 10th point, IV " 0 connection of bracket panel II " bracket panel 0 point; IV " the bracket panel brush connects II " contact of bracket panel except that 0 o'clock, II " the bracket panel brush is divided into two-way, and one the tunnel through 21.78 Ω resistance R
2The back is coiled at the 10th with IV ' replacement and is connected, and another road connects II ' replacement and coils the 10th point, and II measuring disk the 1st o'clock is through 1.98 Ω resistance R
3Be connected with the 10th of IV measuring disk, 0 of 0 of II measuring disk and IV measuring disk all with 21.111 Ω resistance R
4Connect at one end resistance R
4The other end is connected with 0 of I measuring disk; 0 on I ' replacement dish connects 2758.89 Ω resistance R
5Back and V " 0 of bracket panel is connected; V " the 10th connection of bracket panel III " bracket panel the 10th point; V " the bracket panel brush connects III " and bracket panel all the other each contacts except that the 10th contact, III " the bracket panel brush is divided into two branch roads, and one the tunnel through 21.78 Ω resistance R
6The back connects 0 point of V ' replacement dish, and another road connects III ' replacement and coils 0 point, and the 9th of III measuring disk connects 1.98 Ω resistance R
7The back is connected with 0 of V measuring disk, and the 10th of III measuring disk measured at the 10th with the V dish and all be connected with the 20th of I measuring disk; The I ' replacement dish brush and 30 Ω resistance r
1Be connected in parallel on potential difference meter measure portion positive pole, resistance r
1The other end connects two dpdt double-pole double-throw (DPDT) range selector K
1-1* 0.1 range contact, K
1-2* 0.1 range contact and I measuring disk brush all with two double-pole double throw switch K
1-1* 1 range contact connects 243 Ω resistance r
2One end connects K
1-2* 0.1 range contact, the other end connects K
1-2* 1 range contact, this contact is connected potential difference meter and measures partly negative pole, two double-pole double throw switch K
1-1With K
1-2Two normally closed contact short circuits.
Potential difference meter is used to connect two measured terminals, and anodal terminal connects II measuring disk the 10th point, and the negative pole terminal is by galvanometer change-over switch K
2Be connected with 0 of III measuring disk.
By above technical scheme, the measuring disk that five step discs are used for measure portion connects with lead, contact resistance and variation, 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 be the volt, how many μ V are thermoelectrical potential be, both differ 10 the 6 power orders of magnitude, and therefore influence can be ignored, even so, even contact resistance variation and thermoelectrical potential are big to the degree of can not ignore, can be by standard is adjusted RP
3Resistance obtain revising, zero potential can increase between V measuring disk and the I measuring disk lead resistance and revise, 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 this instrumental resolution can obtain good repeatability when being 0.1 μ V.Because the range conversion is that one digit number or double figures are taken advantage of 10 integral number power with resistance, available interim standard resistance is revised with resistance range conversion, has improved the accuracy of potential difference meter range ratio.
Description of drawings
Accompanying drawing is a principle of the invention circuit.
Among the figure, K
1-1, K
1-2Be two double-pole double throw switch K
1In two-layer, K
1-1Connect contact, the left side, K
1-2Connect contact, the right.
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 temperature compensation dish RP
4, arrive resistance R then
0, adjustable resistance RP
3, 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 temperature compensation dish RP
4, be standard loop to the standard cell negative pole again.When five 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 second dish threw at 0, second dish equated that with the 4th dish partly resistance in parallel when the 4th dish was thrown different indicating value, the circuit resistance was constant.When second dish is not thrown 0 the time, the 4th dish is thrown different indicating values, the circuit resistance is not having IV " resistance changes during bracket panel; stepping of the 4th every increase of dish; the circuit resistance can increase half resistance of each stepping resistance; for the total resistance of holding circuit constant; at IV " in the bracket panel each stepping reduce same resistance, when second step disc throws 0, the resistance minimum, at this moment allow IV " bracket panel resistance all seals in circuit, makes the circuit resistance constant, in like manner; the right circuit is provided with III " bracket panel and V " bracket panel is that to switch to the total resistance of any indicating value holding circuit constant for the 3rd step disc and the 5th step disc switch; because first dish is made up of resistance identical measuring disk and replacement dish, so what indicating value no matter five dishes throw, circuit always hinders constant.
When * 0.1 range, resistance is 1/9 resistance r of resistance between two brushes of first step disc
1In parallel with two brushes, the electric current that flows through between two brushes of first step disc is reduced to * 1/10 during 1 range, the amount of making limit is reduced to 1/10, resistance r
1With resistance value is reduced after two brushes are in parallel, so seal in resistance r in the potentiometer circuit
2Keep total resistance value constant.
The potential difference meter working current is 1mA, left side electric current 10/11mA between two brushes of first step disc, the right electric current is 1/11mA, left side electric current flows through II " is divided into two equal branch roads; when second dish threw at 0, two branch roads that flow through II measuring disk and IV measuring disk separated, when the II measuring disk does not throw 0; flow through II measuring disk branch current and all flow through IV measuring disk resistance, and 10 resistance of IV measuring disk add resistance R behind the bracket panel brush
3Play the effect of the 1st resistance of II measuring disk, when the IV measuring disk is thrown n
4The time, though the ohmically electric current in n4～0 is exactly a left side electric current, can regards two branch currents as and be formed by stacking, can be when therefore calculating with separate computations; In like manner, the right electric current is thrown n at the 5th dish between two brushes of first step disc
5The time, 10～n
5Electric current regard the stack of two branch currents as, take separate computations during calculating.Sampling is 1018 Ω with setting up resistance R N resistance, when the working current standardization, setting up ohmically pressure drop is 1.018V, the potential difference meter calibrating is carried out in constant temperature enclosure, standard electromotive force of the cell is 1.0186V in the time of 20 ℃, during 20 ℃ of temperature departures, every degree can compensate by-40 μ V, temperature compensation dish RP
4Be 20 * 0.05 Ω, satisfy the national standard of each step value compensation 50 μ V of 0.02 grade of potential difference meter.
The minimum calibration of thermometer on the standard cell EN is 0.1 ℃, after according to temperature value the temperature compensation dish being regulated, and K switch
2Point to the right, regulate adjustable resistance RP
1, RP
2And PR
3After, make galvanometer G nulling, potential difference meter working current standardization at this moment, at this moment, the I measuring disk is thrown n
1, the I measuring disk is thrown n
1, the II measuring disk is thrown n
2, the III measuring disk is thrown n
3The IV measuring disk is thrown n
4, the V measuring disk throws n
5At this moment voltage is between two of measuring junction terminals:
Ux＝5/11×2.2n
2+5/11+0.022n
4+10/11×21.111Ω+10/11×10n
1-1/11×(20-n
1)×10-1/22(10-n
5)×0.022-1/22×(10-n
3)×2.2(mv)
＝n
2+0.01n4+200/11+1+0.01+100n
1/11-200/11+10n
1/11-0.01+0.001n
5-1+0.1n
3(mv)
＝10n
1+n
2+0.1n
3+0.01n
4+0.001n
5(mv)
More than be * during 1 range, five measuring disk indicating values, when * 0.1 range, five measuring disk indicating values are expressed as n
1+ 0.1n
2+ 0.01n
3+ 0.001n
4+ 0.0001n
5(mv)
The potential difference meter operating voltage is 1.5V, gets fixed resistance for supply voltage is worked in 1.4V～1.65 scopes
R
0=111 Ω, adjustable resistance RP
1=20 * 12.5 Ω, adjustable resistance RP
2Be=20 * 0.65 Ω, RP
3=20 * 0.035 Ω.
Claims (1)
1. two-range potentiometer that has five measuring disk to adopt diverter branchs, it has working current to regulate resistance R P
1, RP
2, RP
3And be used to reduce the fixed resistance R of supply voltage
0, sampling is with setting up resistance R N 1018 Ω and temperature compensation dish RP during to standard
420 * 0.05 Ω, and be connected in the potential difference meter work loop by the network that resistance on first step disc, second step disc, the 3rd step disc, the 4th step disc, the 5th step disc is formed, working current is 1mA when standardization; It is characterized in that first step disc is made up of I measuring disk and the I ' replacement dish, 0～20 indicating value is provided, two resistance above the dish are 20 * 10 Ω, second step disc is by " 0 ", non-resistance between " 1 " two contacts, there is the II measuring disk of 9 * 2.2 Ω resistance 1～10 contact, II ' the replacement dish of 10 * 2.2 Ω reaches and is not connected to resistance, 0 contact is independent, the II that all the other contacts link to each other " the bracket panel composition; the 3rd step disc is by " 9 "; non-resistance between " 10 " two contacts; be the III measuring disk of 9 * 2.2 Ω resistance between 0～9 contact; III ' the replacement dish of 10 * 2.2 Ω and the 10th III that all the other each points of independence connect " the bracket panel composition, the 4th step disc is by all being that the IV measuring disk of 10 * 0.022 Ω resistance and IV ' replacement dish and resistance are the IV of 10 * 0.011 Ω " bracket panel forms; the 5th step disc is the V measuring disk of 10 * 0.022 Ω by resistance; V ' replacement dish and resistance are the V of 10 * 0.011 Ω " bracket panel forms, except that first step disc, the replacement dish of all the other four step discs and the brush of measuring disk are connected to each other; I ' replacement dish brush is connected in the metering circuit positive pole, and I ' replacement is coiled at the 20th and connected 64.779 Ω resistance R
1The back connects IV " bracket panel the 10th point, IV " 0 connection of bracket panel II " bracket panel 0 point; IV " the bracket panel brush connects II " contact of bracket panel except that 0 o'clock, II " the bracket panel brush is divided into two-way, and one the tunnel through 21.78 Ω resistance R
2The back is coiled at the 10th with IV ' replacement and is connected, and another road connects II ' replacement and coils the 10th point, and II measuring disk the 1st o'clock is through 1.98 Ω resistance R
3Be connected with the 10th of IV measuring disk, 0 of 0 of II measuring disk and IV measuring disk all with 21.111 Ω resistance R
4Connect at one end resistance R
4The other end is connected with 0 of I measuring disk; 0 on I ' replacement dish connects 2758.89 Ω resistance R
5Back and V " 0 of bracket panel is connected; V " the 10th connection of bracket panel III " bracket panel the 10th point; V " the bracket panel brush connects III " and bracket panel all the other each contacts except that the 10th contact, III " the bracket panel brush is divided into two branch roads, and one the tunnel through 21.78 Ω resistance R
6The back connects 0 point of V ' replacement dish, and another road connects III ' replacement and coils 0 point, and the 9th of III measuring disk connects 1.98 Ω resistance R
7The back is connected with 0 of V measuring disk, and the 10th of III measuring disk measured at the 10th with the V dish and all be connected with the 20th of I measuring disk; The I ' replacement dish brush and 30 Ω resistance r
1Be connected in parallel on potential difference meter measure portion positive pole, resistance r
1The other end connects two dpdt double-pole double-throw (DPDT) range selector K
1-1* 0.1 range contact, K
1-2* 0.1 range contact and I measuring disk brush all with two double-pole double throw switch K
1-1* 1 range contact connects 243 Ω resistance r
2One end connects K
1-2* 0.1 range contact, the other end connects K
1-2* 1 range contact, this contact is connected potential difference meter and measures partly negative pole, two double-pole double throw switch K
1-1With K
1-2Two normally closed contact short circuits; Potential difference meter is used to connect two measured terminals, and anodal terminal connects II measuring disk the 10th point, and the negative pole terminal is by galvanometer change-over switch K
2X is connected with 0 of III measuring disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100622763A CN100386630C (en) | 2005-12-28 | 2005-12-28 | Bimeasuring range pitantial difference mater using divided branch having five measuring discs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100622763A CN100386630C (en) | 2005-12-28 | 2005-12-28 | Bimeasuring range pitantial difference mater using divided branch having five measuring discs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1793969A CN1793969A (en) | 2006-06-28 |
| CN100386630C true CN100386630C (en) | 2008-05-07 |
Family
ID=36805532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100622763A Expired - Fee Related CN100386630C (en) | 2005-12-28 | 2005-12-28 | Bimeasuring range pitantial difference mater using divided branch having five measuring discs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100386630C (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0280303A2 (en) * | 1987-02-26 | 1988-08-31 | Veb Kombinat Wolle Und Seide | Method and circuit for the automatic measuring of direct currents |
| CN1673753A (en) * | 2005-04-22 | 2005-09-28 | 骆乃光 | Portable potential difference meter with high resolution ratio |
| CN1673754A (en) * | 2005-04-22 | 2005-09-28 | 骆乃光 | Portable potential difference meter |
| CN1673755A (en) * | 2005-04-22 | 2005-09-28 | 骆乃光 | Potential difference meter with seven bit reading |
-
2005
- 2005-12-28 CN CNB2005100622763A patent/CN100386630C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0280303A2 (en) * | 1987-02-26 | 1988-08-31 | Veb Kombinat Wolle Und Seide | Method and circuit for the automatic measuring of direct currents |
| CN1673753A (en) * | 2005-04-22 | 2005-09-28 | 骆乃光 | Portable potential difference meter with high resolution ratio |
| CN1673754A (en) * | 2005-04-22 | 2005-09-28 | 骆乃光 | Portable potential difference meter |
| CN1673755A (en) * | 2005-04-22 | 2005-09-28 | 骆乃光 | Potential difference meter with seven bit reading |
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| Publication number | Publication date |
|---|---|
| CN1793969A (en) | 2006-06-28 |
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| PB01 | Publication | ||
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Granted publication date: 20080507 Termination date: 20101228 |