CN1793944A - Potential difference meter having five mensuring discs - Google Patents
Potential difference meter having five mensuring discs Download PDFInfo
- Publication number
- CN1793944A CN1793944A CN 200510062235 CN200510062235A CN1793944A CN 1793944 A CN1793944 A CN 1793944A CN 200510062235 CN200510062235 CN 200510062235 CN 200510062235 A CN200510062235 A CN 200510062235A CN 1793944 A CN1793944 A CN 1793944A
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- CN
- China
- Prior art keywords
- resistance
- measuring disk
- bracket panel
- dish
- iii
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Abstract
A potential difference meter with five measuring discs is prepared as using 20 x 20 omega as the first measuring disc, 9 x 4.4 omega as the second and the third discs, 10 x 0.044 omega as the fourth and the fifth measuring discs; using conductive wire to connect resistances on all measuring discs between two measuring end buttons to exclude influence of contact resistance variation and thermo voltage from measuring switch on measuring result.
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 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.
Technical scheme of the present invention is such: 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 and temperature compensation dish RP during to standard
4And five resistor networks of measuring on the step switch are connected in the potential difference meter work loop, and working current is 0.5mA when standardization; It is characterized in that first step dish is made up of I measuring disk and I ' replacement dish, 0～20 indicating value is provided, two resistance above the dish are 20 * 20 Ω, second step disc is by " 0 ", non-resistance between " 1 " two contacts, there is the II measuring disk of 9 * 4.4 Ω resistance 1～10 contact, II ' the replacement dish of 10 * 4.4 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 * 4.4 Ω resistance between 0～9 contact; III ' the replacement dish of 10 * 4.4 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 * 0.044 Ω resistance and IV ' replacement dish and resistance are the IV of 10 * 0.022 Ω " bracket panel forms; the 5th step disc is the V measuring disk of 10 * 0.044 Ω by resistance; V ' replacement dish and resistance are the V of 10 * 0.022 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 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 43.56 Ω resistance R
1Back and IV " replacement coils at the 10th and is connected, and another road connects II ' replacement and coils the 10th point, and II measuring disk the 1st o'clock is through 3.96 Ω resistance R
2Back IV measuring disk the 10th connection, 0 of 0 of II measuring disk and IV measuring disk all with 42.222 Ω resistance R
3Connect at one end resistance R
3The other end is connected with 0 of I measuring disk; 0 on I ' replacement dish connects 4222.2 Ω resistance R
4Back 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 ' bracket panel all the other each contacts except that the 10th contact, III " the bracket panel brush is divided into two branch roads, the one tunnel through 43.56 Ω resistance R
5The 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 3.96 Ω resistance R
6The 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; I measuring disk brush is connected potential difference meter and measures partly negative pole, and two terminals of measuring disk are anodal to be connected with the 10th of II measuring disk, and negative pole 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
2Resistance obtain revising, zero potential can increase between V measuring disk and the I measuring disk lead resistance to be revised, and Just because of this, has reduced the requirement to switch, adopt small-sized measurement step switch after, whole instrument overall dimensions reduce many.
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 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
2To setting up resistance R N and temperature compensation dish RP
1, be standard loop to the standard cell negative pole again.When five dishes are all thrown " 0 ", left side resistance equals 495 Ω between two brushes of first step disc, and the right resistance equals 4950 Ω, and total resistance is 450 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.
The potential difference meter working current is 0.5mA, left side electric current 5/11mA between two brushes of first step disc, the right electric current is 0.5/11mA, 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, n
4Though～0 ohmically electric current is exactly a left side electric current, can regard 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 2036 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 * 0.1 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 ℃, and after according to temperature value the temperature compensation dish being regulated, K switch is pointed to the right, regulates 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
5
Ux＝5/22×4.4n
2+5/22×0.044n
4+5/11×(40+2.2+0.022)+5/11×20n
1-0.5/11×(20-n
1×20-0.5/22×(10-n
5)×0.044-0.5/22×(10-n
3)×4.4(mv)
＝n
2+0.04n
4+200/11+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)
The potential difference meter operating voltage is 1.5V, gets fixed resistance RO=312 Ω, adjustable resistance RP for supply voltage is worked in 1.4V～1.65 scopes
1=20 * 25 Ω, adjustable resistance RP
2Be=20 * 1.4 Ω, RP
3=20 * 0.08 Ω.
Claims (1)
- A kind of potential difference meter that five measuring disk are arranged, 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 and temperature compensation dish RP during to standard 4And five resistor networks of measuring on the step switch are connected in the potential difference meter work loop, and working current is 0.5mA when standardization; It is characterized in that first step dish is made up of I measuring disk and I ' replacement dish, 0～20 indicating value is provided, two resistance above the dish are 20 * 20 Ω, second step disc is by " 0 ", non-resistance between " 1 " two contacts, there is the II measuring disk of 9 * 4.4 Ω resistance 1～10 contact, II ' the replacement dish of 10 * 4.4 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 * 4.4 Ω resistance between 0～9 contact; III ' the replacement dish of 10 * 4.4 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 * 0.044 Ω resistance and IV ' replacement dish and resistance are the IV of 10 * 0.022 Ω " bracket panel forms; the 5th step disc is the V measuring disk of 10 * 0.044 Ω by resistance; V ' replacement dish and resistance are the V of 10 * 0.022 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 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 43.56 Ω resistance R 1Back and IV " replacement coils at the 10th and is connected, and another road connects II ' replacement and coils the 10th point, and II measuring disk the 1st o'clock is through 3.96 Ω resistance R 2Back IV measuring disk the 10th connection, 0 of 0 of II measuring disk and IV measuring disk all with 42.222 Ω resistance R 3Connect at one end resistance R 3The other end is connected with 0 of I measuring disk; 0 on I ' replacement dish connects 4222.2 Ω resistance R 4Back 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 ' bracket panel all the other each contacts except that the 10th contact, III " the bracket panel brush is divided into two branch roads, the one tunnel through 43.56 Ω resistance R 5The 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 3.96 Ω resistance R 6The 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; I measuring disk brush is connected potential difference meter and measures partly negative pole, and two terminals of measuring disk are anodal to be connected with the 10th of II measuring disk, and negative pole is by galvanometer change-over switch K 2Be connected with 0 of III measuring disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510062235 CN1793944A (en) | 2005-12-27 | 2005-12-27 | Potential difference meter having five mensuring discs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510062235 CN1793944A (en) | 2005-12-27 | 2005-12-27 | Potential difference meter having five mensuring discs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1793944A true CN1793944A (en) | 2006-06-28 |
Family
ID=36805507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510062235 Withdrawn CN1793944A (en) | 2005-12-27 | 2005-12-27 | Potential difference meter having five mensuring discs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1793944A (en) |
-
2005
- 2005-12-27 CN CN 200510062235 patent/CN1793944A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C04 | Withdrawal of patent application after publication (patent law 2001) | ||
| WW01 | Invention patent application withdrawn after publication |