CN1991379A - Four-range potentiometer utilizing branch line having four measuring plates - Google Patents
Four-range potentiometer utilizing branch line having four measuring plates Download PDFInfo
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- CN1991379A CN1991379A CN 200510062348 CN200510062348A CN1991379A CN 1991379 A CN1991379 A CN 1991379A CN 200510062348 CN200510062348 CN 200510062348 CN 200510062348 A CN200510062348 A CN 200510062348A CN 1991379 A CN1991379 A CN 1991379A
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- resistance
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Abstract
The invention provides a potentiometer with four measuring discs and diverting branch four range switching for voltage measurement, wherein 20X100 Omega is used as a No:1 measuring disc, 10X11 Omega is used as a No:2 measuring disc, 9-22 Omega is used as a No:3 measuring disc, 10X2.2 Omega is used as a No:2 measuring disc, wherein the on-off switch does not influence measurement result, the two measuring junction knobs and the four measuing discs are connected directly with cables, the contact resistance of the measurement step switch, the variable difference and thermoelectrical potential are eliminated outside the measurement result, and the zero potential can further raise negative potential for compensation, in X0.1 measuring range and X0.01measuring range, a common resistance is employed for dividing the current.
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 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, makes instrumental resolution reach 0.1 μ V.When range was changed, range conversion was the resistance that one digit number or two figure places are taken advantage of 10 integral number power with resistance.
Technical scheme of the present invention is such: working current is regulated resistance R P
1And RP
2, be used to reduce the fixed resistance R of supply voltage
0, sampling is associated in the potential difference meter work loop with the resistance string of setting up on resistance R N and the measurement step switch during to standard, sets up ohmically voltage drop when equating with the potential difference meter internal attachment standard, and its working current equals 1mA; It is waited to levy and is that 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 * 11 Ω are respectively arranged and the II ' replacement dish, the 3rd step disc is by non-resistance between 9 and 10, these two contacts disconnect, all the other contacts are by the III measuring disk of 9 * 22 Ω of resistance connection, the III ' replacement the dish of 10 * 22 Ω is arranged and be not welded with resistance, 10 independences, the III that all the other contacts connect " form; " form by bracket panel by being all IV measuring disk and the IV ' replacement dish that 10 * 2.2 Ω resistance form and the IV that 10 * 1.1 Ω resistance are arranged for the 4th step disc by bracket panel, except that first step disc, all the other respectively coil measuring disk and are communicated with in twos separately with the brush of replacement dish; The I ' replacement coils at the 20th by 647.9 Ω resistance R
1Connect the II ' replacement and coil the 10th point, 0 of II measuring disk connects one 212.1 Ω resistance R
2The back is connected with 0 of I measuring disk; 0 on the I ' replacement dish connects one 27579 Ω resistance R
3The back connects IV " bracket panel 0 point; IV " bracket panel the 10th with III " bracket panel the 10th contact is connected; IV " the bracket panel brush connects III " bracket panel all contacts except that the 10th contact; the III ' bracket panel brush one tunnel connects the III ' replacement and coils 0 point, and another road connects 198 Ω resistance R
4The back is connected with 0 on the IV ' replacement dish, and 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 0 point, and the 10th of IV measuring disk is connected with the 20th of I measuring disk; The I ' replacement dish brush and 300 Ω resistance r
1Be connected in parallel on potential difference meter and measure partly positive pole, resistance r
1The other end and three cuttves four are thrown range selector K
1-1* 1 range contact connects K in this range
1-2The K of contact and * 10 ranges
1-1The contact connects, K
1-3The contact is by 2430 Ω resistance r
2K with * 10 ranges
1-3The contact connects, and this contact is connected the negative pole of Measurement Network resistance; In * 0.1 range, K
1-1The K of contact and * 0.01 range
1-1The contact connection is also passed through 30 Ω resistance r
3Be connected K with the I ' replacement dish brush
1-2270 Ω resistance r are leaded up in the contact
4K with * 10 ranges
1-1The contact connects the back and is connected with I measuring disk brush, and another road is by 27000 Ω resistance r
5K with * 0.01 range
1-2The contact connects, K
1-3The contact is by 0.27 Ω resistance r
6Connect behind this layer * 0.01 range contact through 240.03 Ω resistance r
7Connect K
1-3* 1 range contact, the K of three cuttves, four throw switches
1-1, K
1-2, K
1-3Three layers of mutual short circuit of normally closed contact are measured the terminal positive pole for two and are connected with the 10th of II measuring disk, and negative pole passes through K switch
2Be connected with 0 of III measuring disk.
By above technical scheme, the measuring disk that four 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
2Resistance obtain revising, zero potential can be revised by increasing between IV measuring disk and the I measuring disk lead resistance, so 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.
Embodiment
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 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 RP
3, be standard loop to the standard cell negative pole again.When four dishes are all thrown " 0 ", left side resistance is 2970 Ω between two brushes of first step disc, and the right resistance equals 29700 Ω, and total resistance is 2700 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 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.
When * 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 10 ranges, 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.At * 0.1 range, total resistance resistance in series r between two brushes of first step disc
4After, with 99 times to resistance r
3Resistance and resistance r
3Parallel connection, make to flow through the measuring disk electric current and be reduced to * 10 ranges 1/100, the amount of making limit is reduced to * 10 ranges 1/100, parallel connection reduces resistance, advances resistance r by series connection in potentiometer circuit
6Add resistance r
7Keep total resistance constant, when * 0.01 range, the resistance resistance r that connected between two brushes of first step disc
4With resistance r
5After, with 999 times to r
3Resistance and resistance r
3Parallel connection is reduced to * per mille of 10 ranges the electric current that flows through measuring disk, makes circuit reduce resistance after the parallel connection, by seal in resistance r in circuit
7The holding circuit resistance is constant.
Basic range 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 is 1/11mA, 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, 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
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
2Throw to the left side, be positioned at this moment that voltage is between two terminals of measurement:
Ux＝10/11×11n
2+10/11×(200+11+1.1)+10/11×100n
1-1/11×(20-n
1)×100-1/22×
(10-n
4)×2.2-1/22×(10-n
3)×?22(mv)
＝10n
2+2000/11+10+1+1000n
1/11-2000/11+100n
1/11-1+0.1nn
4-10+1n
3(mv)
＝100n
1+10n
2+1n
3+0.1n
4(mv)
The potential difference meter operating voltage is 4.5V, 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 4.2V～4.95V, gets fixed resistance R
0=480 Ω, adjustable resistance RP
1=20 * 37 Ω, RP
2Be 0～41 Ω.
Claims (1)
- A kind of four-range potentiometer that has four measurement disks to adopt diverter branch, it has working current to regulate resistance R P 1And RP 2, be used to reduce the fixed resistance R of supply voltage 0, sampling is associated in the potential difference meter work loop with the resistance string of setting up on resistance R N and the measurement step switch during to standard, sets up ohmically voltage drop when equating with the potential difference meter internal attachment standard, and its working current equals 1mA; It is waited to levy and is that 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 * 11 Ω are respectively arranged and the II ' replacement dish, the 3rd step disc is by non-resistance between 9 and 10, these two contacts disconnect, all the other contacts are by the III measuring disk of 9 * 22 Ω of resistance connection, the III ' replacement the dish of 10 * 22 Ω is arranged and be not welded with resistance, 10 independences, the III that all the other contacts connect " form; " form by bracket panel by being all IV measuring disk and the IV ' replacement dish that 10 * 2.2 Ω resistance form and the IV that 10 * 1.1 Ω resistance are arranged for the 4th step disc by bracket panel, except that first step disc, all the other respectively coil measuring disk and are communicated with in twos separately with the brush of replacement dish; The I ' replacement coils at the 20th by 647.9 Ω resistance R 1Connect the II ' replacement and coil the 10th point, 0 of II measuring disk connects one 212.1 Ω resistance R 2The back is connected with 0 of I measuring disk; 0 on the I ' replacement dish connects one 27579 Ω resistance R 3The back connects IV " bracket panel 0 point; IV " bracket panel the 10th with III " bracket panel the 10th contact is connected; IV " the bracket panel brush connects III " bracket panel all contacts except that the 10th contact; the III ' bracket panel brush one tunnel connects the III ' replacement and coils 0 point, and another road connects 198 Ω resistance R 4The back is connected with 0 on the IV ' replacement dish, and 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 0 point, and the 10th of IV measuring disk is connected with the 20th of I measuring disk; The I ' replacement dish brush and 300 Ω resistance r 1Be connected in parallel on potential difference meter and measure partly positive pole, resistance r 1The other end and three cuttves four are thrown range selector K 1-1* 1 range contact connects K in this range 1-2The K of contact and * 10 ranges 1-1The contact connects, K 1-3The contact is by 2430 Ω resistance r 2K with * 10 ranges 1-3The contact connects, and this contact is connected the negative pole of Measurement Network resistance; In * 0.1 range, K 1-1The K of contact and * 0.01 range 1-1The contact connection is also passed through 30 Ω resistance r 1Be connected K with the I ' replacement dish brush 1-2270 Ω resistance r are leaded up in the contact 4K with * 10 ranges 1-1The contact connects the back and is connected with I measuring disk brush, and another road is by 27000 Ω resistance r 5K with * 0.01 range 1-2The contact connects, K 1-3The contact is by 0.27 Ω resistance r 6Connect behind this layer * 0.01 range contact through 240.03 Ω resistance r 7Connect K 1-3* 1 range contact, the K of three cuttves, four throw switches 1-1, K 1-2, K 1-3Three layers of mutual short circuit of normally closed contact are measured the terminal positive pole for two and are connected with the 10th of II measuring disk, and negative pole passes through K switch 2Be connected with 0 of III measuring disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100623484A CN1991379B (en) | 2005-12-30 | 2005-12-30 | Four-range potentiometer utilizing branch line having four measuring plates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100623484A CN1991379B (en) | 2005-12-30 | 2005-12-30 | Four-range potentiometer utilizing branch line having four measuring plates |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1991379A true CN1991379A (en) | 2007-07-04 |
| CN1991379B CN1991379B (en) | 2010-09-15 |
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ID=38213781
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005100623484A Expired - Fee Related CN1991379B (en) | 2005-12-30 | 2005-12-30 | Four-range potentiometer utilizing branch line having four measuring plates |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1991379B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101754A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Micro-electric potential measurement instrument |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3893026A (en) * | 1972-12-06 | 1975-07-01 | Vsevolod Ivanovich Glazkov | Method and apparatus for measuring electrochemical potential difference between a metallic structure and earth |
| CN88211574U (en) * | 1988-03-30 | 1988-12-28 | 上海电工仪器厂 | Multifunctional dc potentiometer |
| CN1330966C (en) * | 2005-04-22 | 2007-08-08 | 骆乃光 | Portable potential difference meter with high resolution ratio |
| CN100354633C (en) * | 2005-04-22 | 2007-12-12 | 骆乃光 | Potential difference meter with seven bit reading |
-
2005
- 2005-12-30 CN CN2005100623484A patent/CN1991379B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1991379B (en) | 2010-09-15 |
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|---|---|---|---|
| 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 | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100915 Termination date: 20121230 |