CN201555876U - Potential difference meter with three measuring discs - Google Patents
Potential difference meter with three measuring discs Download PDFInfo
- Publication number
- CN201555876U CN201555876U CN2009202022758U CN200920202275U CN201555876U CN 201555876 U CN201555876 U CN 201555876U CN 2009202022758 U CN2009202022758 U CN 2009202022758U CN 200920202275 U CN200920202275 U CN 200920202275U CN 201555876 U CN201555876 U CN 201555876U
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- Prior art keywords
- resistance
- contact
- measuring disk
- node
- potential difference
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Abstract
The utility model relates to a potential difference meter with three measuring discs, which is used for direct voltage measurement, a first stepping disc of the potential difference meter consists of the 22*10 omega measuring disc, a second stepping disc constitutes the measuring disc by a 11*11 omega annular resistance net and constitutes an auxiliary disc by 0.5 omega resistors, the third disc is a dual-slide line disc, and the two measuring discs are connected with the measuring slide lines by using conductive wires and not switched through a switch, thereby avoiding the impacts caused by variation and thermal potential when measuring by using the potential difference meter, and further omitting the two auxiliary discs of the first stepping disc.
Description
Technical field
The utility model relates to the instrument that DC voltage is measured.
Background technology
Current for the potential difference meter that three measuring disk are arranged, in the connection between three measuring disk, telophragma generally adopts switch to switch, and so just produces the variation of contact resistance, brings restriction to resolution.In order to overcome this problem, generally adopt big brush with the increase contact area, and adopt silver-carbon/carbon-copper composite material; Patent No. ZL200720107587.1, ZL200720109901.X, and application number 200710067805.8 has announced that the potential difference meter that three measuring disk are arranged solves the variation new method of switch contact resistance, its first step disc is made up of a measuring disk and two bracket panels, because first step disc was declined at 0 o'clock, the total resistance of circuit changed when second step disc was put different indicating value, first step disc was put at 0 o'clock, the total resistance of circuit was constant when second step disc was put different indicating value, for this reason first step disc increased by two bracket panels distinguish step disc put 0 and the circuit of declining 0 two kinds of situations connect, thereby increased the volume of instrument, also made switch and apparatus structure become complicated.
The utility model content
The purpose of this utility model is a kind of potential difference meter that three measuring disk are arranged of design, and telophragma does not switch by switch in the connection of three measuring disk, and first step disc cancellation bracket panel.
The technical solution of the utility model is to take like this:
Electric current from the positive pole of potential difference meter 1.5V working power through the resistance measurement network formed by two step discs and two slide wire disc setting resistance R to 485 Ω
NAnd the lockable adjustable resistance R of 0～1 Ω
P2, again to 66 Ω resistance R
0, through 0～120 Ω adjustable resistance R
P1Get back to the negative pole of working power and form potential difference meter work loop; Standard cell E
NAnodal arriving through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts set up resistance R
NAnd lockable adjustable resistance R
P2Sliding contact, again through 100K Ω current-limiting resistance R to standard cell E
NNegative pole is formed the potential difference meter standard loop; Potential difference meter is used to connect measured " U
X" two terminals, anodal terminal through the resistor network of the two slide wire discs of two measuring disk and through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts to negative pole terminal composition potential difference meter equalizing network; It is characterized in that first step disc has only measuring disk I, it has 0,1,2 ... 22 totally 23 gears, connect one of 10 Ω resistance between each grade contact, second step disc is made up of measuring disk II and bracket panel II ', measuring disk II has 0,1,2 ... 10 totally 11 gears, the resistance that 11 11 Ω are arranged above, the 1st resistance R
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end, resistance R
3The other end welds the 4th resistance R
4One end, resistance R
4The other end welds the 5th resistance R
5One end, resistance R
5The other end welds the 6th resistance R
6One end, resistance R
6The other end welds the 7th resistance R
7One end, resistance R
7The other end welds the 8th resistance R
8One end, resistance R
8The other end welds the 9th resistance R
9One end, resistance R
9The other end welds the 10th resistance R
10One end, resistance R
10The other end welds the 11st resistance R
11One end, the 11st resistance R
11The other end and the 1st resistance R
1The other end connect resistance R
1With resistance R
2Tie point be connected resistance R through 20 Ω resistance with the 1st contact
2With resistance R
3Tie point be connected resistance R through 12 Ω resistance with the 2nd contact
3With resistance R
4Tie point be connected resistance R through 6 Ω resistance with the 3rd contact
4With resistance R
5Tie point be connected resistance R through 2 Ω resistance with the 4th contact
5With resistance R
6Tie point be connected resistance R with the 5th contact
6With resistance R
7Tie point be connected resistance R with the 6th contact
7With resistance R
8Tie point be connected resistance R through 2 Ω resistance with the 7th contact
8With resistance R
9Tie point be connected resistance R through 6 Ω resistance with the 8th contact
9With resistance R
10Tie point be connected resistance R through 12 Ω resistance with the 9th contact
10With resistance R
11Tie point be connected resistance R through 20 Ω resistance with the 10th contact
10With resistance R
11Tie point be node A, resistance R
1With resistance R
11The point that connects is a Node B, and Node B is connected with 0 contact through 30 Ω resistance, is the resistance of 10 0.5 Ω on the bracket panel II ' of second step disc, passes through 200 Ω resistance R between the brush of the second step disc measuring disk II and the brush of bracket panel II '
12Connect, the 3rd dish is two slide wire discs, two slip thickness materials are identical, resistance all is 10 Ω, wherein one is measuring disk slip III, another root is bracket panel slip III ', the index dial of two slide wire discs indicates 0,1,2,10 big lattice of 100 one indicating value points, every big lattice are not marked numeral equally distributed 10 little lattice, the corresponding resistance of every big lattice is 1 Ω, " 0 " indicating value of two slide wire disc index dials, just replacement dish slip III ' reaches measuring disk slip III the 0th contact, i.e. top on the brush of the two slide wire discs contact slide wire resistance, " 10 " indicating value of two slide wire disc index dials, just replacement dish slip III ' and measuring disk slip III the 10th contact, i.e. brush on the end on the brush of the two slide wire discs contact slide wire resistance, two slide wire resistances is with a slice metallic brush sheet; Bracket panel II ' the 10th contact and 2300 Ω resistance R
13End point in parallel be node C, node C is connected with the positive pole of potential difference meter working power, the 22nd contact connection of brush connection measuring disk I of bracket panel II ', the 0 contact connected node A of measuring disk I, resistance R
13The other end connect to measure the top " 0 " of slip III, the end " 10 " of measuring slip III is through 90 Ω resistance R
14Back connecting circuit Node B, Node B connect sets up resistance R
NNoble potential one end; Potential difference meter is used to connect measured " U
X" two terminals, anodal terminal is connected with measuring disk I brush, the negative pole terminal is connected with auxiliary slip III ' through behind the double-point double-throw switch K.
By above technical scheme, first step disc has saved two bracket panels, makes potential difference meter simple in structure, volume-diminished, also reduced production cost, in equalizing network, do not passed through switch on the circuit of three measuring disk connections simultaneously, so do not have variation and thermoelectric potential influence; The brush of first step disc and two slide wire discs switches and causes that change in resistance does not influence measurement numerical value, only influences the galvanometer damping, and compares brush with the resistance variations of whole equalizing network and switch and cause that change in resistance can ignore.
Description of drawings
Fig. 1 is the utility model schematic circuit.
In Fig. 1, the measuring disk I of 22 * 10 Ω, expression measuring disk I is made up of the resistance of 22 10 Ω; In like manner, the bracket panel II ' of 10 * 0.5 Ω, expression bracket panel II ' is made up of the resistance of 10 0.5 Ω, and resistance R in the resistance ring network of expression measuring disk II is arranged in the resistance ring network of measuring disk II " 10 * 11 Ω "
1～resistance R
10Ten resistances all are 11 Ω.
Embodiment
In Fig. 1, measuring disk II is 11 the 11 end to end resistance rings of Ω between node A and Node B, when measuring disk II puts " 5 " or puts " 6 ", the brush of measuring disk II is to being that 5 11 Ω resistance are in parallel with 6 11 Ω resistance between the Node B, back in parallel resistance is 30 Ω to the maximum, so 5th, corresponding point directly are connected on 6 contacts and the resistance ring, other contact of measuring disk II all is connected to 30 Ω to the resistance value between the Node B; When measuring disk II put " 4 " or puts " 7 ", the brush of measuring disk II was to being that 4 11 Ω resistance are in parallel with 7 11 Ω resistance between the Node B, and back in parallel resistance is 28 Ω, so the 4th, 7 contacts are connected with corresponding point on the resistance ring through 2 Ω resistance; When measuring disk II put " 3 " or puts " 8 ", the brush of measuring disk II was to being that 3 11 Ω resistance are in parallel with 8 11 Ω resistance between the Node B, and back in parallel resistance is 24 Ω, so the 3rd, 8 contacts are connected with corresponding point on the resistance ring through 6 Ω resistance; When measuring disk II put " 2 " or puts " 9 ", the brush of measuring disk II was to being that 2 11 Ω resistance are in parallel with 9 11 Ω resistance between the Node B, and back in parallel resistance is 18 Ω, so the 2nd, 9 contacts are connected with corresponding point on the resistance ring through 12 Ω resistance; When measuring disk II set or when putting " 10 ", the brush of measuring disk II is to being that 1 11 Ω resistance is in parallel with 10 11 Ω resistance between the Node B, and back in parallel resistance is 10 Ω, so the 1st, 10 contacts are connected with corresponding point on the resistance ring through 20 Ω resistance; When measuring disk II reset, the 0th contact of measuring disk II is between the Node B being the connections of 30 Ω resistance.
The brush of the brush of the measuring disk II of second step disc and bracket panel II ' is synchronous, and during the second step disc reset, the brush of bracket panel II ' is that two resistance that are both 230 Ω are in parallel with resistance value between the Node B, is 115 Ω therefore.
During the second step disc set, the calculating of resistance value need be carried out triangle-star conversion between the brush of bracket panel II ' and the Node B, establishes resistance (R
2+ R
3+ ... + R
9+ R
10) and resistance R
11The both sides resistance is equivalent to resistance r
1, resistance R
11With resistance R
1The both sides resistance is equivalent to resistance r
1' resistance (R
2+ R
3+ ... + R
9+ R
10) and resistance R
1The both sides resistance is equivalent to resistance r
1", be equivalent to resistance r
1, r
1', r
1" intersection point is Q
1:
R then
1=(R
2+ R
3+ ... + R
9+ R
10) * R
11/ (R
1+ R
2+ ... + R
10+ R
11)=9 * 11 * 11/11 * 11 Ω=9 Ω
r
1’＝R
1×R
11/(R
1+R
2+…+R
10+R
11)＝11×11/11×11Ω＝1Ω
r
1”＝(R
2+R
3+…+R
9+R
10)×R
1/(R
1+R
2+…+R
10+R
11)＝9×11×11/11×11Ω＝9Ω
Resistance value equals (220 Ω+r between the brush of bracket panel II ' and the Node B
1) * (200 Ω+20 Ω+r
1")/(2 * 229) Ω+r
1'=229 Ω/2+1 Ω=114.5 Ω+1 Ω=115.5 Ω
When second step disc is put " 2 ", the calculating of resistance value between the brush of bracket panel II ' and the Node B: establish resistance (R
3+ R
4+ ... + R
9+ R
10) and resistance R
11The both sides resistance is equivalent to resistance r
2, resistance R
11With resistance (R
1+ R
2) the both sides resistance is equivalent to resistance r
2' resistance (R
3+ R
4+ ... + R
9+ R
10) and resistance (R
1+ R
2) the both sides resistance is equivalent to resistance r
2", be equivalent to resistance r
2, r
2', r
2" intersection point is Q
2:
R then
2=8 Ω r
2'=2 Ω r
2"=16 Ω
Resistance value equals (220 Ω+r between the brush of bracket panel II ' and the Node B
2) * (200 Ω+12 Ω+r
2")/(2 * 228) Ω+r
2'=228 Ω/2+2 Ω=114 Ω+2 Ω=116 Ω.
In like manner, when second step disc was put " 3 ", resistance value was 116.5 Ω between the brush of bracket panel II ' and the Node B,
When second step disc was put " 4 ", resistance value was 117 Ω between the brush of bracket panel II ' and the Node B,
When second step disc was put " 5 ", resistance value was 117.5 Ω between the brush of bracket panel II ' and the Node B,
……
When second step disc was put " 10 ", resistance value was 120 Ω between the brush of bracket panel II ' and the Node B.
Increase by 0.5 Ω because measuring disk II is connected the every stepping in back with measuring disk I, so the every stepping of bracket panel II ' reduces by 0.5 Ω, it is constant that circuit is always hindered.
Node C is 120 Ω through two step discs to the resistance of Node B, and node C is 2400 Ω through slide wire disc to the resistance of Node B, is 2.1mA during the standardization of potential difference meter working current, and electric current is 2mA on the 120 Ω resistance, and electric current is 0.1mA on the 2400 Ω resistance; According to triangle-star conversion, I is to equivalent resistance r for bracket panel II ' brush process measuring disk
n, r
n', r
n" intersection point Q
n(n=1,2,3 ... 9) resistance and bracket panel II ' brush are through 200 Ω resistance R
12To intersection point Q
nResistance equate, so flow through measuring disk I and 200 Ω resistance R
12Electric current respectively be 1mA; When measuring disk II puts " 10 ", bracket panel II ' brush through measuring disk I to the resistance of node A and bracket panel II ' brush through 200 Ω resistance R
12Resistance to node A all equals 220 Ω, so flow through measuring disk I and 200 Ω resistance R
12Electric current also respectively be 1mA.
For ten one the 11 Ω end to end resistance rings of measuring disk II between node A and Node B, resistance R during measuring disk II set
1To be all 11 Ω resistance in parallel with 10 resistances, flows through resistance R
11Electric current be 1/11mA, the voltage U between node A and the Node B
AB=1/11 * 11mV=1mV; Resistance (R when measuring disk II puts " 2 "
1+ R
2) to be all 11 Ω resistance in parallel with 9 resistances, flows through resistance R
11Electric current be 2/11mA, the voltage U between node A and the Node B
AB=2/11 * 11mV=2mV; (n=1,2,3 when in like manner, measuring disk II puts " n " ... 10) voltage U between resistance nodes A and the Node B
AB=n mV; During measuring disk II reset, electric current is without resistance R
11, U
AB=0mV.
Measuring disk I, measuring disk II, measure slip III all during reset, U
ABOn 10mV voltage equal to measure 0 voltage of order of slip III to B, so measure and the node A equipotential of slip III at 0.
During the working current standardization, first step disc is put n
1, second step disc puts n
2, the 3rd dish puts n
3(n
3Represent big lattice indicating value) " U at this moment
x" two measure that voltage is between terminal:
U
x＝×10n
1+1×10+n
2/11×11-0.1×90-0.1×1×(10-n
3) (mV)
＝10n
1+10+n
2-9-1+0.1n
3 (mV)
＝10n
1+n
2+0.1n
3 (mV)
Standard cell disperses, and between 1.0188V～1.0196V, standardized working current is 2.1mA, therefore sets up resistance R
NGet 485 Ω, add the lockable adjustable resistance R of 0～1 Ω
P2, variation range that can the coverage criteria battery.
Electromotive force was about 1.65V when dry cell was new, and to 1.4V when following, the electric current shakiness can both make the working current of potential difference meter be adjusted to standardization in order to make dry cell under new, former affection condition, for this reason resistance R with old
0Get 66 Ω.Get adjustable resistance R
P1Be 0～120 Ω.
2.1mA normalized current is to determine like this: 200mV standard signal voltage is pressed polarity and potential difference meter " U
x" two measure terminal and connect, potential difference meter coils respectively that total indicating value is identical with the standard signal magnitude of voltage, double-point double-throw switch K throws to the left side, adjusting adjustable resistance R
P1, make galvanometer G nulling; Again double-point double-throw switch K is thrown to the right, regulate adjustable resistance R
P2, make galvanometer G nulling, at this moment adjustable resistance R
P2Locking; When using from now on, potential difference meter is standard according to this.
Claims (1)
1. potential difference meter that three measuring disk are arranged, electric current from the positive pole of potential difference meter 1.5V working power through the resistance measurement network formed by two step discs and two slide wire disc setting resistance R to 485 Ω
NAnd the lockable adjustable resistance R of 0～1 Ω
P2, again to 66 Ω resistance R
0, through 0～120 Ω adjustable resistance R
P1Get back to the negative pole of working power and form potential difference meter work loop; Standard cell E
NAnodal arriving through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts set up resistance R
NAnd lockable adjustable resistance R
P2Sliding contact, again through 100K Ω current-limiting resistance R to standard cell E
NNegative pole is formed the potential difference meter standard loop; Potential difference meter is used to connect measured " U
X" two terminals, anodal terminal through the resistor network of the two slide wire discs of two measuring disk and through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts to negative pole terminal composition potential difference meter equalizing network; It is characterized in that first step disc has only measuring disk I, it has 0,1,2 ... 22 totally 23 gears, connect one of 10 Ω resistance between each grade contact, second step disc is made up of measuring disk II and bracket panel II ', measuring disk II has 0,1,2 ... 10 totally 11 gears, the resistance that 11 11 Ω are arranged above, the 1st resistance R
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end, resistance R
3The other end welds the 4th resistance R
4One end, resistance R
4The other end welds the 5th resistance R
5One end, resistance R
5The other end welds the 6th resistance R
6One end, resistance R
6The other end welds the 7th resistance R
7One end, resistance R
7The other end welds the 8th resistance R
8One end, resistance R
8The other end welds the 9th resistance R
9One end, resistance R
9The other end welds the 10th resistance R
10One end, resistance R
10The other end welds the 11st resistance R
11One end, the 11st resistance R
11The other end and the 1st resistance R
1The other end connect resistance R
1With resistance R
2Tie point be connected resistance R through 20 Ω resistance with the 1st contact
2With resistance R
3Tie point be connected resistance R through 12 Ω resistance with the 2nd contact
3With resistance R
4Tie point be connected resistance R through 6 Ω resistance with the 3rd contact
4With resistance R
5Tie point be connected resistance R through 2 Ω resistance with the 4th contact
5With resistance R
6Tie point be connected resistance R with the 5th contact
6With resistance R
7Tie point be connected resistance R with the 6th contact
7With resistance R
8Tie point be connected resistance R through 2 Ω resistance with the 7th contact
8With resistance R
9Tie point be connected resistance R through 6 Ω resistance with the 8th contact
9With resistance R
10Tie point be connected resistance R through 12 Ω resistance with the 9th contact
10With resistance R
11Tie point be connected resistance R through 20 Ω resistance with the 10th contact
10With resistance R
11Tie point be node A, resistance R
1With resistance R
11The point that connects is a Node B, and Node B is connected with 0 contact through 30 Ω resistance, is the resistance of 10 0.5 Ω on the bracket panel II ' of second step disc, passes through 200 Ω resistance R between the brush of the second step disc measuring disk II and the brush of bracket panel II '
12Connect, the 3rd dish is two slide wire discs, two slip thickness materials are identical, resistance all is 10 Ω, wherein one is measuring disk slip III, another root is bracket panel slip III ', the index dial of two slide wire discs indicates 0,1,2,10 big lattice of 100 one indicating value points, every big lattice are not marked numeral equally distributed 10 little lattice, the corresponding resistance of every big lattice is 1 Ω, " 0 " indicating value of two slide wire disc index dials, just replacement dish slip III ' reaches measuring disk slip III the 0th contact, i.e. top on the brush of the two slide wire discs contact slide wire resistance, " 10 " indicating value of two slide wire disc index dials, just replacement dish slip III ' and measuring disk slip III the 10th contact, i.e. brush on the end on the brush of the two slide wire discs contact slide wire resistance, two slide wire resistances is with a slice metallic brush sheet; Bracket panel II ' the 10th contact and 2300 Ω resistance R
13End point in parallel be node C, node C is connected with the positive pole of potential difference meter working power, the 22nd contact connection of brush connection measuring disk I of bracket panel II ', the 0 contact connected node A of measuring disk I, resistance R
13The other end connect to measure the top " 0 " of slip III, the end " 10 " of measuring slip III is through 90 Ω resistance R
14Back connecting circuit Node B, Node B connect sets up resistance R
NNoble potential one end; Potential difference meter is used to connect measured " U
X" two terminals, anodal terminal is connected with measuring disk I brush, the negative pole terminal is connected with auxiliary slip III ' through behind the double-point double-throw switch K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202022758U CN201555876U (en) | 2009-12-14 | 2009-12-14 | Potential difference meter with three measuring discs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202022758U CN201555876U (en) | 2009-12-14 | 2009-12-14 | Potential difference meter with three measuring discs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201555876U true CN201555876U (en) | 2010-08-18 |
Family
ID=42615564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202022758U Expired - Lifetime CN201555876U (en) | 2009-12-14 | 2009-12-14 | Potential difference meter with three measuring discs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201555876U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710141B (en) * | 2009-12-14 | 2011-04-13 | 骆晓英 | Potential difference meter with three measuring panels |
-
2009
- 2009-12-14 CN CN2009202022758U patent/CN201555876U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710141B (en) * | 2009-12-14 | 2011-04-13 | 骆晓英 | Potential difference meter with three measuring panels |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20100818 Effective date of abandoning: 20091214 |