CN100394198C - Potential difference meter with four measuring disks - Google Patents
Potential difference meter with four measuring disks Download PDFInfo
- Publication number
- CN100394198C CN100394198C CNB2005100623677A CN200510062367A CN100394198C CN 100394198 C CN100394198 C CN 100394198C CN B2005100623677 A CNB2005100623677 A CN B2005100623677A CN 200510062367 A CN200510062367 A CN 200510062367A CN 100394198 C CN100394198 C CN 100394198C
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- CN
- China
- Prior art keywords
- resistance
- measuring disk
- iii
- replacement
- potential difference
- 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.)
- Withdrawn - After Issue
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Abstract
The present invention relates to a potential difference meter with four measuring discs, and is used for measuring direct current voltage. The present invention is composed of four measuring discs as 20*10 omega, 10*1.1 omega, 9*2.2 omega and 10*0.22 omega. All measuring resistors are directly connected by conducting wires. Contact resistance and variation of a measuring stepping switch are excluded out of a measuring result. The minimum resolution is equal to 1 muV.
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 four step discs arranged, and contact resistance and variation that the measuring switch stepping is switched, the switch thermoelectrical potential does not influence measurement result.
Technical scheme of the present invention is such: a kind of potential difference meter that four measurement disks is arranged, it has working current to regulate resistance R P
1And RP
2, be used to reduce the fixed resistance R of supply voltage
0, the 10188 Ω setting resistance R N of sampling usefulness and range of adjustment are at the adjustable resistance RP of 0～12 Ω during to standard
3, and the resistor network on four step discs is connected in the potential difference meter work loop, sets up ohmically voltage drop when equating with the potential difference meter internal attachment standard, its working current equals 0.1mA; It is characterized in that first step disc is made up of I measuring disk that 20 * 10 Ω are respectively arranged and the I ' replacement dish, second step disc is made up of II measuring disk that 10 * 1.1 Ω are respectively arranged and the II ' replacement dish, the 3rd step disc is by " 9 ", non-resistance between " 10 " two contacts, these two contacts disconnect, all the other contacts are by the III measuring disk of 9 * 2.2 Ω resistance of resistance connection, 10 * 2.2 Ω the III ' replacement dishes are arranged and be not welded with resistance, the 10th independence, the III that all the other contacts connect " bracket panel forms; the 4th step disc is by being all IV measuring disk and the IV ' replacement dish that 10 * 0.22 Ω resistance form and the IV that 10 * 0.11 Ω resistance are arranged " bracket panel forms, except that first step disc, the brush of the measuring disk on all the other step discs oneself dish is connected with the brush of replacement dish; The I ' replacement is coiled the 20th connection the II ' replacement and is coiled the 10th point, and the 0th of II measuring disk connects one 21.21 Ω resistance R
1The back is connected with the 0th of I measuring disk, and the I ' replacement is coiled at the 0th and connected one 2110 Ω resistance R
2The back connects IV " bracket panel the 0th point; IV " the 10th of bracket panel and III " the 10th of bracket panel be connected; IV " the bracket panel brush connects III " bracket panel all contacts except that the 10th contact; and III " bracket panel brush one tunnel connects the III ' replacement and coils the 0th point, and 19.8 Ω resistance R are passed through on another road
3Coil at the 0th with the IV ' replacement and be connected, the 10th of III measuring disk directly is connected with the 20th of I measuring disk; The 9th of III measuring disk connects IV measuring disk the 0th point, and the 10th of IV measuring disk is connected with the 20th of I measuring disk; The I ' replacement dish brush connects potential difference meter measure portion positive pole, and I measuring disk brush connects potential difference meter measure portion negative pole, and 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 connected with the 0th of III measuring disk by galvanometer change-over switch K.
By above technical scheme, the measuring disk that four step discs 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, how many supply voltages is is lied prostrate, 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 thermoelectrical potential are big to the degree of can not ignore, can be by standard be adjusted RP
2Resistance obtain revising, zero potential can be revised by increasing between IV measuring disk and the I measuring disk lead resistance, has got rid of disturbing factor and has made the apparatus measures data obtain good repeatability.
Description of drawings
Accompanying drawing is a principle of the invention circuit.
Embodiment
By " U
x" anodal through each measuring disk, arrive " U through change-over switch K again
x" negative pole is to measure the loop, by positive source through measuring step switch to setting resistance R N and 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, to setting up resistance R N and RP
3, be standard loop to the standard cell negative pole again.When four dishes were all thrown " 0 ", left side resistance was 232.21 Ω between two brushes of first step disc, and the right resistance equals 2322.1 Ω, and 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 the 3rd dish threw at the 10th, the 4th dish equated that with the 3rd dish partly resistance in parallel when the 4th dish was thrown different indicating value, the circuit resistance was constant.When the 3rd dish is not thrown at the 10th, the 4th dish is thrown different indicating values, the circuit resistance is not having IV " resistance changes during bracket panel; the 4th dish every increase stepping, circuit resistance can reduce half resistance of each stepping resistance, for the total resistance of holding circuit constant; at IV " in the bracket panel each stepping increase same resistance, resistance minimum when the 3rd step disc throws at the 10th, " bracket panel resistance all seals in circuit, makes the circuit resistance constant at this moment to allow IV.Because second dish and first dish are formed by resistance identical measuring disk and replacement dish, so what indicating value no matter four dishes throw, circuit always hinders constant.
Basic range potential difference meter standard operation electric current is 0.1mA, left side electric current 1/11mA between two brushes of first step disc, the right electric current is 1/110mA, the right electric current flows through III " is divided into two equal branch roads; when the 3rd dish throws at the 10th; two branch roads that flow through III measuring disk and IV measuring disk separate; when the III measuring disk does not throw at the 10th; flow through III measuring disk branch current and all flow through IV measuring disk resistance; 10 resistance of IV measuring disk play the effect of the 10th resistance of III measuring disk, when the IV measuring disk is thrown n behind the bracket panel brush
4The time, n
4Though～10 ohmically electric currents are exactly the right electric current, can regard two branch currents as and be formed by stacking, can be with separate computations when therefore calculating;
The standard operation electric current is to determine like this, at " U
x" two of two ends measure terminals and connect normal voltage near full scale by polarity, K switch is thrown to the left side, the measuring disk indicating value is identical with standard voltage value, by regulating working current adjusting resistance R P
1And RP
2, make the galvanometer nulling, again K switch to be thrown to the right, sampling is 10188 Ω with the resistance of setting up resistance R N, 0～12 Ω adjustable resistance RP has connected
3, regulate RP
3, make galvanometer nulling once more, again K switch is thrown to the left side, regulate RP
2Make the galvanometer nulling, again K switch is thrown 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
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, K switch is thrown to the left side, is positioned at this moment that voltage is between two terminals of measurement:
ux＝1/11×1.1n
2+1/11(20+1.1+0.11)+1/11×10n
1-1/110(20-n
1)×10-1/220(10-n
4)
×0.22-1/220(10-n
3)×2.2 (mv)
＝0.1n
2+20/11+0.1+0.01+10n
1/11-20/11+1n
1/11-0.01+0.001n
4-0.1+0.01n
3(mv)
＝1n
1+0.1n
2+0.01n
3+0.001n
4(mv)
The potential difference meter operating voltage is 1.5V, because the every joint stable electrical of dry cell kinetic potential between 1.4V～1.65V, all can be adjusted to standard state to the potential difference meter working current for realizing supply voltage at 1.4V～1.65V, gets fixed resistance R
0=3590 Ω, adjustable resistance RP
1=20 * 125 Ω, RP
2Be 0～140 Ω.
Claims (1)
1. potential difference meter that four measurement disks is arranged, it has working current to regulate resistance R P
1And RP
2, be used to reduce the fixed resistance R of supply voltage
0, the 10188 Ω setting resistance R N of sampling usefulness and range of adjustment are at the adjustable resistance RP of 0～12 Ω during to standard
3, and the resistor network on four step discs is connected in the potential difference meter work loop, sets up ohmically voltage drop when equating with the potential difference meter internal attachment standard, its working current equals 0.1mA; It is characterized in that first step disc is made up of I measuring disk that 20 * 10 Ω are respectively arranged and the I ' replacement dish, second step disc is made up of II measuring disk that 10 * 1.1 Ω are respectively arranged and the II ' replacement dish, the 3rd step disc is by " 9 ", non-resistance between " 10 " two contacts, these two contacts disconnect, all the other contacts are by the III measuring disk of 9 * 2.2 Ω resistance of resistance connection, 10 * 2.2 Ω the III ' replacement dishes are arranged and be not welded with resistance, the 10th independence, the III that all the other contacts connect " bracket panel forms; the 4th step disc is by being all IV measuring disk and the IV ' replacement dish that 10 * 0.22 Ω resistance form and the IV that 10 * 0.11 Ω resistance are arranged " bracket panel forms, except that first step disc, the brush of the measuring disk on all the other step discs oneself dish is connected with the brush of replacement dish; The I ' replacement is coiled the 20th connection the II ' replacement and is coiled the 10th point, and the 0th of II measuring disk connects one 21.21 Ω resistance R
1The back is connected with the 0th of I measuring disk, and the I ' replacement is coiled at the 0th and connected one 2110 Ω resistance R
2The back connects IV " bracket panel the 0th point; IV " the 10th of bracket panel and III " the 10th of bracket panel be connected; IV " the bracket panel brush connects III " bracket panel all contacts except that the 10th contact; and III " bracket panel brush one tunnel connects the III ' replacement and coils the 0th point, and 19.8 Ω resistance R are passed through on another road
3Coil at the 0th with the IV ' replacement and be connected, the 10th of III measuring disk directly is connected with the 20th of I measuring disk; The 9th of III measuring disk connects IV measuring disk the 0th point, and the 10th of IV measuring disk is connected with the 20th of I measuring disk; The I ' replacement dish brush connects potential difference meter measure portion positive pole, and I measuring disk brush connects potential difference meter measure portion negative pole, and 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 connected with the 0th of III measuring disk by galvanometer change-over switch K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100623677A CN100394198C (en) | 2005-12-30 | 2005-12-30 | Potential difference meter with four measuring disks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100623677A CN100394198C (en) | 2005-12-30 | 2005-12-30 | Potential difference meter with four measuring disks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1818673A CN1818673A (en) | 2006-08-16 |
| CN100394198C true CN100394198C (en) | 2008-06-11 |
Family
ID=36918767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100623677A Withdrawn - After Issue CN100394198C (en) | 2005-12-30 | 2005-12-30 | Potential difference meter with four measuring disks |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100394198C (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
- 2005-12-30 CN CNB2005100623677A patent/CN100394198C/en not_active Withdrawn - After Issue
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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1818673A (en) | 2006-08-16 |
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| C14 | Grant of patent or utility model | ||
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| C20 | Patent right or utility model deemed to be abandoned or is abandoned |