CN1991387A - Direct current potentiometer having five scale readings - Google Patents
Direct current potentiometer having five scale readings Download PDFInfo
- Publication number
- CN1991387A CN1991387A CN 200510062356 CN200510062356A CN1991387A CN 1991387 A CN1991387 A CN 1991387A CN 200510062356 CN200510062356 CN 200510062356 CN 200510062356 A CN200510062356 A CN 200510062356A CN 1991387 A CN1991387 A CN 1991387A
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- CN
- China
- Prior art keywords
- resistance
- measuring disk
- iii
- replacement
- dish
- 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.)
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention provides a DC potentiometer with five-digit reading for DC voltage measurement, and comprises three measuring discs of 20X8 Omega, 9X1.76 Omega, 10X0.176 Omega and a 0-0.968 Omega slide discs for providing five-digit reading system, all the resistors for measurement are connected directly with wires, thereby eliminating the contact resistance and variation difference of the step switch from the measurement 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 being used for measure portion in the potential difference meter three step discs and a slide wire disc 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: 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 1.25mA; It is characterized in that first step disc is made up of I measuring disk that 20 * 8 Ω are respectively arranged and the I ' replacement dish, second step disc is by non-resistance between 0 and 1, these two contacts disconnect, all the other contacts are by the II measuring disk of 9 * 1.76 Ω of resistance connection, the II ' replacement the dish of 10 * 1.76 Ω is arranged and be not welded with resistance, 0 independence, the II that all the other contacts connect " form; " form by bracket panel by being all III measuring disk and the III ' replacement dish that 10 * 0.176 Ω resistance form and the III that 10 * 0.088 Ω resistance are arranged for the 3rd step disc by bracket panel, the 4th dish is two slide wire discs, two slide wire resistance resistances all are 0～0.968 Ω, wherein one is IV measuring disk slip, another root is an IV ' replacement dish slip, the index dial of slip indicates 10 big lattice of 0～100 one indicating value, every big lattice have 10 little lattice, 0 indicating value has 5 little lattice to show forward, also be equivalent to " 1 " more forward to slide wire disc top and 5 little lattice resistance arranged backward in slide wire disc inside, the resistance value of every big lattice correspondence is 0.088 Ω, 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; All the other are put and are connected except that 0 o'clock for the I ' replacement is coiled at the 20th and connected III " bracket panel the 10th point; III " 0 of bracket panel connects II " 0 connection of bracket panel; this coil brush and II " bracket panel, " bracket panel brush one tunnel connects the II ' replacement and coils the 10th point II, and another road is by 15.84 Ω resistance R
1Coil at the 10th with the III ' replacement and be connected, the 1st of II measuring disk connects III measuring disk the 10th point, and it is 16.088 Ω resistance R that 0 of II measurement is connected resistance jointly with 0 of III measuring disk
2The back is connected with 0 of I measuring disk, and the 20th of I measuring disk connects IV measuring disk the 10th point, and the IV ' replacement dish top connects 1696.712 Ω resistance R
3The back is connected with 0 on the I ' replacement dish; The I ' replacement dish brush is connected the metering circuit positive pole, I measuring disk brush is connected potential difference meter and measures partly negative pole, two terminals of measuring junction are anodal to be connected with the 10th of II measuring disk, and negative pole is connected with IV measuring disk line top by galvanometer change-over switch K.
By above technical scheme, the measuring disk that three step discs and slide wire disc are used for measure portion connects with lead, measure step switch 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 obtain revising by adjusting the slide wire disc zero-bit, or increases between IV measuring disk and the I measuring disk lead resistance and revise, and can 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 are all thrown " 0 ", 185.768 Ω such as left side resistance between two brushes of first step disc, the right resistance equals 1857.68 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 second dish threw at 0, second dish equated that with the 3rd dish partly resistance in parallel when the 3rd dish was thrown different indicating value, the circuit resistance was constant.When second dish is not thrown 0 the time, the 3rd dish is thrown different indicating values, the circuit resistance is not having III " resistance changes during bracket panel; the 3rd dish every increase stepping, circuit resistance can increase half resistance of each stepping resistance, for the total resistance of holding circuit constant; each stepping reduces same resistance in the 3rd bracket panel; resistance minimum when second step disc throws 0, and " bracket panel resistance all seals in circuit, makes the circuit resistance constant at this moment to allow III.Because first dish and the 4th dish are formed by resistance identical measuring disk and replacement dish, so what indicating value no matter four dishes throw, circuit always hinders constant.
The potential difference meter working current is 1.25mA, left side electric current 12.5/11mA between two brushes of first step disc, the right electric current is 1.25/11mA, left side electric current flows through II " is divided into two equal branch roads; when second dish throws at 0; two branch roads that flow through II measuring disk and III measuring disk separate; when the II measuring disk does not throw 0; flow through II measuring disk branch current and all flow through III measuring disk resistance; 10 resistance of III measuring disk play the effect of the 1st resistance of II measuring disk, when the III measuring disk is thrown n behind the bracket panel brush
3The time, n
3Though～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;
1.25mA working 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 815 Ω with the resistance of setting up resistance R N, 0～1 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, when * 1 range, 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＝12.5/22×1.76n
2+12.5/22×0.176n
3+12.5/11×(16+0.088)+12.5/11
×8n
1-1.25/11×(20-n
1)×8-1.25/11×(10-n
4)×0.088(mv)
＝n
2+0.1n
3+200/11+0.1+100n
1/11-200/11+10n
1/11-0.1+0.01n
4(mv)
＝10n
1+n
2+0.1n
3+0.01n
4(mv)
Top n
4Calculate by big lattice resistance, every little lattice resolution is 1 μ v.
The potential difference meter operating voltage is 1.5v, gets fixed resistance R for supply voltage is worked in 1.4v～1.65v scope
0=124 Ω, adjustable resistance RP
1=20 * 10 Ω, adjustable resistance RP
2Be 0～11 Ω.
Claims (1)
- A kind of DC potentiometer of five digit reading, 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 1.25mA; It is characterized in that first step disc is made up of I measuring disk that 20 * 8 Ω are respectively arranged and the I ' replacement dish, second step disc is by non-resistance between 0 and 1, these two contacts disconnect, all the other contacts are by the II measuring disk of 9 * 1.76 Ω of resistance connection, the II ' replacement the dish of 10 * 1.76 Ω is arranged and be not welded with resistance, 0 independence, the II that all the other contacts connect " form; " form by bracket panel by being all III measuring disk and the III ' replacement dish that 10 * 0.176 Ω resistance form and the III that 10 * 0.088 Ω resistance are arranged for the 3rd step disc by bracket panel, the 4th dish is two slide wire discs, two slide wire resistance resistances all are 0～0.968 Ω, wherein one is IV measuring disk slip, another root is an IV ' replacement dish slip, the index dial of slip indicates 10 big lattice of 0～100 one indicating value, every big lattice have 10 little lattice, 0 indicating value has 5 little lattice to show forward, also be equivalent to " 1 " more forward to slide wire disc top and 5 little lattice resistance arranged backward in slide wire disc inside, the resistance value of every big lattice correspondence is 0.088 Ω, 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; All the other are put and are connected except that 0 o'clock for the I ' replacement is coiled at the 20th and connected III " bracket panel the 10th point; III " 0 of bracket panel connects II " 0 connection of bracket panel; this coil brush and II " bracket panel, " bracket panel brush one tunnel connects the II ' replacement and coils the 10th point II, and another road is by 15.84 Ω resistance R 1Coil at the 10th with the III ' replacement and be connected, the 1st of II measuring disk connects III measuring disk the 10th point, and it is 16.088 Ω resistance R that 0 of II measurement is connected resistance jointly with 0 of III measuring disk 2The back is connected with 0 of I measuring disk, and the 20th of I measuring disk connects IV measuring disk the 10th point, and the IV ' replacement dish top connects 1696.712 Ω resistance R 3The back is connected with 0 on the I ' replacement dish; The I ' replacement dish brush is connected the metering circuit positive pole, I measuring disk brush is connected potential difference meter and measures partly negative pole, two terminals of measuring junction are anodal to be connected with the 10th of II measuring disk, and negative pole is connected with IV measuring disk line top by galvanometer change-over switch K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510062356 CN1991387A (en) | 2005-12-30 | 2005-12-30 | Direct current potentiometer having five scale readings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510062356 CN1991387A (en) | 2005-12-30 | 2005-12-30 | Direct current potentiometer having five scale readings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1991387A true CN1991387A (en) | 2007-07-04 |
Family
ID=38213789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510062356 Withdrawn CN1991387A (en) | 2005-12-30 | 2005-12-30 | Direct current potentiometer having five scale readings |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1991387A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354410B (en) * | 2008-08-28 | 2010-12-08 | 骆晓英 | DC potential difference meter using slide wire tray |
| CN101788587B (en) * | 2008-08-28 | 2011-10-05 | 骆晓英 | Voltage measuring instrument |
| CN101788590B (en) * | 2008-08-28 | 2011-10-05 | 骆晓英 | Voltage measuring device |
| CN104215811B (en) * | 2014-09-22 | 2017-01-18 | 富阳精密仪器厂 | Single arm electric bridge and potentiometer dual purpose meter |
-
2005
- 2005-12-30 CN CN 200510062356 patent/CN1991387A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101354410B (en) * | 2008-08-28 | 2010-12-08 | 骆晓英 | DC potential difference meter using slide wire tray |
| CN101788587B (en) * | 2008-08-28 | 2011-10-05 | 骆晓英 | Voltage measuring instrument |
| CN101788590B (en) * | 2008-08-28 | 2011-10-05 | 骆晓英 | Voltage measuring device |
| CN104215811B (en) * | 2014-09-22 | 2017-01-18 | 富阳精密仪器厂 | Single arm electric bridge and potentiometer dual purpose meter |
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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 |