CN101718805B - Multi-range voltage-measuring instrument - Google Patents

Multi-range voltage-measuring instrument Download PDF

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CN101718805B
CN101718805B CN2009101554297A CN200910155429A CN101718805B CN 101718805 B CN101718805 B CN 101718805B CN 2009101554297 A CN2009101554297 A CN 2009101554297A CN 200910155429 A CN200910155429 A CN 200910155429A CN 101718805 B CN101718805 B CN 101718805B
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resistance
contact
node
range
measuring disk
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CN101718805A (en
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骆小君
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Abstract

The invention relates to a multi-range voltage-measuring instrument which is used for measuring a DC (Direct Current) voltage and provided with three measuring disks including two step disks and one double slide-wire disk. Two measuring disks in the voltage-measuring instrument are connected with measuring slide wires by leads to prevent the voltage-measuring instrument in measurement from being influenced by variation and thermoelectric power without using switch conversion. The positions of contact range conversion resistors are changed so that four ranges are obtained, the minimum resolution reaches 0.1 microvolt, and two auxiliary disks of a fist step disk are saved.

Description

Multirange voltage measuring instrument
Technical field
The present invention relates to instrument that DC voltage is measured.
Background technology
For the pressure measuring instrument that three measuring disk are arranged, telophragma generally adopts switch to switch, and so just produces the variation of contact resistance, brings restriction to resolution a few days ago.In order to overcome this problem, generally adopt big brush with the increase contact area, and adopt silver-carbon/carbon-copper composite material; The patent No. 200720107591.8 discloses has three four-range pressure measuring instruments of measuring disk to solve the variation new method of switch contact resistance, its first step disc is made up of a measuring disk and two bracket panels, two measuring disk connect the back and are connected between two measurement terminals with slide wire disc, brush on the step disc switch is got rid of outside the measurement loop, do not exist switch to switch between the resistance on three measuring disk, just do not produce variation yet; Because first step disc has three layers, make switch and apparatus structure become complicated, increased the height of instrument simultaneously.
Summary of the invention
The objective of the invention is to design a kind of multirange voltage measuring instrument, telophragma does not switch by switch in the connection of three measuring disk, and two bracket panels of first step disc cancellation.
Technical scheme of the present invention is taked like this: electric current is thrown range selector K through the resistance measurement network of two step discs between node F, the B, two slide wire disc and range transfer resistance to hilted broadsword four from the positive pole of pressure measuring instrument 4.5V working power 1And 441 Ω set up resistance R NWith range of adjustment at the lockable adjustable resistance R of 0～0.6 Ω P3, again to the resistance R of 330 Ω 0, through the adjustable resistance R that forms by 21 15 Ω resistance P1And the adjustable resistance R of range of adjustment between 0～18 Ω P2Get back to the working power negative pole and form the work loop of pressure measuring instrument; Standard cell E NAnodal through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2To setting up resistance R NAnd lockable adjustable resistance R P3, process 100K Ω current-limiting resistance R is to standard cell E again NNegative pole is formed the pressure measuring instrument standard loop; Pressure measuring instrument is used to connect measured " U x" two terminals, anodal terminal through the two slide wire discs of two measuring disk and after, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2Form the pressure measuring instrument equalizing network to the negative pole terminal; It is characterized in that first step disc has measuring disk I, it has 0,1,2 ... 22 totally 23 gears connect one of 100 Ω resistance between each gear contact; The 3rd dish is two slide wire discs, two slip thickness materials are identical, resistance all is 100 Ω, wherein one is measurement slip III, another root is auxiliary slip III ', and the index dial of two slide wire discs divides 10 big lattice, and the resistance of every big lattice correspondence is 10 Ω, every big lattice divide 10 little lattice, and the brush on two slide wire resistances is with a slice metallic brush sheet; 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 have the resistance of 11 110 Ω, the 1st resistance R above 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 200 Ω resistance with the 1st contact 2With resistance R 3Tie point be connected resistance R through 120 Ω resistance with the 2nd contact 3With resistance R 4Tie point be connected resistance R through 60 Ω resistance with the 3rd contact 4With resistance R 5Tie point be connected resistance R through 20 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 20 Ω resistance with the 7th contact 8With resistance R 9Tie point be connected resistance R through 60 Ω resistance with the 8th contact 9With resistance R 10Tie point be connected resistance R through 120 Ω resistance with the 9th contact 10With resistance R 11Tie point be circuit node A, node A is connected resistance R through 200 Ω resistance with the 10th contact 1With resistance R 11The point that connects is a Node B, and Node B is connected with the 0th contact through 300 Ω resistance, is the resistance of 10 5 Ω on the bracket panel II ' of second step disc, passes through 2000 Ω resistance R between the brush of the second step disc measuring disk II and the brush of bracket panel II ' 12Connect, the brush of bracket panel II ' connects the 22nd contact of measuring disk I, the 0th contact connecting circuit node A of measuring disk I, bracket panel II ' the 10th contact and 23000 Ω resistance R 13An end tie point be node C, node C is through 50/7 Ω resistance R 15Back and 11.5 Ω range transfer resistance r 1One end is connected in parallel on node F, and node F connects the positive pole of pressure measuring instrument working power; Resistance R 13The other end connect to measure the 0th contact, top of slip III, end the 10th contact of measuring slip III is through 900 Ω resistance R 14Back connecting circuit Node B; Node B and 10350 Ω range transfer resistance r 4One end is connected in parallel on hilted broadsword four and throws range selector K 1* 10 range contacts, range transfer resistance r 4The other end and 1035 Ω range transfer resistance r 3One end is connected in parallel on hilted broadsword four and throws range selector K 1* 1 range contact, range transfer resistance r 3The other end and 103.5 Ω range transfer resistance r 2After one end connects, through 931.5 Ω resistance r 6Connect hilted broadsword four and throw range selector K 1* 0.1 range contact, range transfer resistance r 2The other end and range transfer resistance r 1The other end connect after, through 1033.965 Ω resistance r 5Connect hilted broadsword four and throw range selector K 1* 0.01 range contact, hilted broadsword four is thrown range selector K 1Normally closed contact connect to set up resistance R NThe high potential end; Pressure measuring instrument is used to connect measured " U X" two terminals, anodal terminal is connected with measuring disk I brush, the negative pole terminal is through double-point double-throw switch K 2The back is connected with auxiliary slip III '.
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 a principle of the invention circuit.
In Fig. 1, the measuring disk I of 22 * 100 Ω, expression measuring disk I is made up of the resistance of 22 100 Ω; In like manner, the bracket panel II ' of 10 * 5 Ω, expression bracket panel II ' is made of the adjustable resistance R of 21 * 15 Ω the resistance of 10 5 Ω P1, expression adjustable resistance R P1Form by 21 15 Ω resistance.Resistance R in the resistance ring network of expression measuring disk II is arranged in the resistance ring network of measuring disk II " 10 * 110 Ω " 1～resistance R 10Ten resistances all are 110 Ω.
Embodiment
In Fig. 1, measuring disk II is 11 the 110 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 5 110 Ω resistance are in parallel with 6 110 Ω resistance between the Node B, back in parallel resistance is 300 Ω to the maximum, other contact of measuring disk II all is connected to 300 Ω to the resistance value between the Node B and is as the criterion, and corresponding point directly are connected on the 5th, 6 contacts and the resistance ring; When measuring disk II put " 4 " or puts " 7 ", the brush of measuring disk II was to being that 4 110 Ω resistance are in parallel with 7 110 Ω resistance between the Node B, and back in parallel resistance is 280 Ω, so the 4th, 7 contacts are connected with corresponding point on the resistance ring through 20 Ω resistance; When measuring disk II put " 3 " or puts " 8 ", the brush of measuring disk II was to being that 3 110 Ω resistance are in parallel with 8 110 Ω resistance between the Node B, and back in parallel resistance is 240 Ω, so the 3rd, 8 contacts are connected with corresponding point on the resistance ring through 60 Ω resistance; When measuring disk II put " 2 " or puts " 9 ", the brush of measuring disk II was to being that 2 110 Ω resistance are in parallel with 9 110 Ω resistance between the Node B, and back in parallel resistance is 180 Ω, so the 2nd, 9 contacts are connected with corresponding point on the resistance ring through 120 Ω resistance; When measuring disk II set or when putting " 10 ", the brush of measuring disk II is to being that 1 110 Ω resistance is in parallel with 10 110 Ω resistance between the Node B, and back in parallel resistance is 100 Ω, so the 1st, 10 contacts are connected with corresponding point on the resistance ring through 200 Ω resistance; When measuring disk II reset, the 0th contact of measuring disk II is between the Node B being the connections of 300 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 2300 Ω are in parallel with resistance value between the Node B, is 1150 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 * 110 * 110/ (11 * 110) Ω=90 Ω
r 1’＝R 1×R 11/(R 1+R 2+…+R 10+R 11)＝110×110/(11×110)Ω＝10Ω
r 1”＝(R 2+R 3+…+R 9+R 10)×R 1/(R 1+R 2+…+R 10+R 11)＝9×110×110/(11×110)Ω＝90Ω
Resistance value equals (2200 Ω+r between the brush of bracket panel II ' and the Node B 1) * (2000 Ω+200 Ω+r 1")/
(2×2290)Ω+r 1’＝2290Ω/2+10Ω＝1145Ω+10Ω＝1155Ω
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=80 Ω r 2'=20 Ω r 2"=160 Ω
Resistance value equals (2200 Ω+r between the brush of bracket panel II ' and the Node B 2) * (2000 Ω+120 Ω+r 2")/
(2×2280)Ω+r 2’＝2280Ω/2+20Ω＝1140Ω+20Ω＝1160Ω。
In like manner, when second step disc was put " 3 ", resistance value was 1165 Ω between the brush of bracket panel II ' and the Node B,
When second step disc was put " 4 ", resistance value was 1170 Ω between the brush of bracket panel II ' and the Node B,
When second step disc was put " 5 ", resistance value was 1175 Ω between the brush of bracket panel II ' and the Node B,
……
When second step disc was put " 10 ", resistance value was 1200 Ω between the brush of bracket panel II ' and the Node B.Increase by 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 5 Ω, it is constant that circuit is always hindered.
Node C is 1200 Ω through two step discs to the resistance of Node B, node C process slide wire disc is 24000 Ω to the resistance of Node B, is 2.1mA during the standardization of voltage-measuring equipment working current, when * 10 ranges, electric current is 2mA on the 1200 Ω resistance, and electric current is 0.1mA on the 24000 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 2000 Ω resistance R 12To intersection point Q nResistance equate, so flow through measuring disk I and 2000 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 2000 Ω resistance R 12Resistance to node A all equals 2200 Ω, so flow through measuring disk I and 2000 Ω resistance R 12Electric current also respectively be 1mA.
Node F is through resistance R 15Arrive Node B totally 1150 Ω again to measuring disk, node F is through resistance r 1, resistance r 2, resistance r 3Also 1150 Ω, * 10, * during 1 range, resistance r 4Changed the position, the circuit resistance is constant; When * 0.1 range, node F is through resistance R 15Add resistance r to Node B again to measuring disk 4Resistance r 3Sum is 12535 Ω and resistance r 1Resistance r 2Sum 115 Ω parallel connections, the resistance that circuit reduces is by sealing in 931.5 Ω resistance r 6The holding circuit resistance is constant; When * 0.01 range, node F is through resistance R 15To measuring disk again to the Node B resistance r that connected 4, resistance r 3, resistance r 2With resistance r 1Parallel connection, the resistance that back in parallel circuit reduces is by sealing in 1033.965 Ω resistance r 5The holding circuit resistance is constant;
When * 10 ranges, node F is through resistance R 15Arrive Node B totally 1150 Ω, resistance r again to measuring disk 4, resistance r 3, resistance r 2With resistance r 1Be 11500 Ω after the series connection, the electric current the during standardization of pressure measuring instrument working current is 2.31mA, and the 2.1mA electric current flows through the 10th the process Node B of bracket panel II ' to range selector K 1* 10 range contacts, 0.21mA flows through resistance r 1, resistance r 2, resistance r 3With resistance r 4To range selector K 1* 10 range contacts; Measuring disk II put " n " (n=1,2,3 ... 9) time, I is to being equivalent to resistance r for the brush of bracket panel I ' process measuring disk n, r n', r n" intersection point Q n(n=1,2,3 ... 9) with through 2000 Ω resistance R 12To intersection point Q nResistance value is equal, when measuring disk II puts " 10 ", and 2000 Ω resistance R 12Add 200 Ω resistance and equate with the resistance value of measuring disk I, so flow through measuring disk I and 2000 Ω resistance R to the resistance value of node A 12Electric current also respectively be 1mA.
For ten one the 110 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 110 Ω resistance in parallel with 10 resistances, when * 10 ranges, flows through resistance R 11Electric current be 1/11mA, the voltage U between node A and the Node B AB=1/11 * 110mV=10mV; Resistance (R when measuring disk II puts " 2 " 1+ R 2) to be all 110 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 * 110mV=20mV; When in like manner, measuring disk II puts " n " (n=1,2,3 ... 10) voltage U between resistance nodes A and the Node B AB=(10 * 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, flow through the voltage U of electric current between node A and Node B of measuring disk I ABOn 100mV 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＝1×100n 1+1×100+n 2/11×110-0.1×900-0.1×10×(10-n 3)(mV)
＝100n 1+1×100+10n 2-90-10+n 3 (mV)
＝100n 1+10n 2+n 3 (mV)
During * 1 range, node F is through resistance R 15To measuring disk again to the Node B resistance r that connected 4Sum is 11500 Ω and its parallel resistor r 1, resistance r 2, resistance r 3Sum is 1150 Ω, so 0.21mA current flowing resistance R 15Arrive Node B again to measuring disk, when 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+1n 2+0.1n 3 (mV)
During * 0.1 range, node F is through resistance R 15To measuring disk again to the Node B resistance r that connected 4And resistance r 3Sum is 12535 Ω and its parallel resistor r 1, resistance r 2Sum is 115 Ω, and resistance value ratio is 109 times, flows through resistance r 1, resistance r 2Electric current with flow through node F through resistance R 15Also be 109 times to the current ratio of Node B again to measuring disk, therefore, flow through node F through resistance R 15Electric current to measuring disk is 1/110 of the electric current of always working, and flows through node F through resistance R 15Electric current to measuring disk is 0.021mA, when 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＝n 1+0.1n 2+0.01n 3 (mV)
During * 0.01 range, node F is through resistance R 15To measuring disk again to the Node B resistance r that connected 4, resistance r 3And resistance r 2Sum is 12638.5 Ω and its parallel resistor r 1Be 11.5 Ω, resistance value ratio is 1099 times, therefore, flows through node F through resistance R 15Electric current to measuring disk is 1/1100 of the electric current of always working, and flows through node F through resistance R 15Electric current to measuring disk is 0.0021mA, when 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＝0.1n 1+0.01n 2+0.001n 3 (mV)
The 3rd dish n 31 μ V be 1 big scale value, every little lattice are 0.1 μ V.
The electromotive force of every series-produced standard cell disperses, and between 1.0188V～1.0196V, standardized working current is 2.31mA, therefore sets up resistance R NGet 441 Ω, add the lockable adjustable resistance R of 0～0.6 Ω P3, variation range that can the coverage criteria cell emf.
Pressure measuring instrument adopts 3 groups of dry cell power supplies, and 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 pressure measuring instrument be adjusted to standardization in order to make dry cell under new, former affection condition, for this reason resistance R with old 0Get 330 Ω.Get adjustable resistance R P1Be 22 * 15 Ω, adjustable resistance R P2Be 0～16 Ω.
Normalized current is to determine like this: 2V standard signal voltage is pressed polarity and pressure measuring instrument " U x" two measure terminal and connect, it is identical with the standard signal magnitude of voltage that pressure measuring instrument respectively coils total indicating value, double-point double-throw switch K 2Throw to the left side, regulate adjustable resistance R P1And adjustable resistance R P2, make galvanometer G nulling; Again with double-point double-throw switch K 2Throw to the right, regulate adjustable resistance R P3, make galvanometer G nulling, at this moment adjustable resistance R P3Locking; When using from now on, pressure measuring instrument is standard according to this.

Claims (1)

1. multirange voltage measuring instrument, electric current is thrown range selector K through the resistance measurement network of two step discs between node F, the B, two slide wire disc and range transfer resistance to hilted broadsword four from the positive pole of pressure measuring instrument 4.5V working power 1And 441 Ω set up resistance R NWith range of adjustment at the lockable adjustable resistance R of 0～0.6 Ω P3, again to the resistance R of 330 Ω 0, through the adjustable resistance R that forms by 21 15 Ω resistance P1And the adjustable resistance R of range of adjustment between 0～18 Ω P2Get back to the working power negative pole and form the work loop of pressure measuring instrument; Standard cell E NAnodal through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2To setting up resistance R NAnd lockable adjustable resistance R P3, process 100K Ω current-limiting resistance R is to standard cell E again NNegative pole is formed the pressure measuring instrument standard loop; Pressure measuring instrument is used to connect measured " U X" two terminals, anodal terminal through the two slide wire discs of two measuring disk and after, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2Form the pressure measuring instrument equalizing network to the negative pole terminal; It is characterized in that first step disc has measuring disk I, it has 0,1,2 ... 22 totally 23 gears connect one of 100 Ω resistance between each gear contact; The 3rd dish is two slide wire discs, two slip thickness materials are identical, resistance all is 100 Ω, wherein one is measurement slip III, another root is auxiliary slip III ', and the index dial of two slide wire discs divides 10 big lattice, and the resistance of every big lattice correspondence is 10 Ω, every big lattice divide 10 little lattice, and the brush on two slide wire resistances is with a slice metallic brush sheet; 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 have the resistance of 11 110 Ω, the 1st resistance R above 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 200 Ω resistance with the 1st contact 2With resistance R 3Tie point be connected resistance R through 120 Ω resistance with the 2nd contact 3With resistance R 4Tie point be connected resistance R through 60 Ω resistance with the 3rd contact 4With resistance R 5Tie point be connected resistance R through 20 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 20 Ω resistance with the 7th contact 8With resistance R 9Tie point be connected resistance R through 60 Ω resistance with the 8th contact 9With resistance R 10Tie point be connected resistance R through 120 Ω resistance with the 9th contact 10With resistance R 11Tie point be circuit node A, node A is connected resistance R through 200 Ω resistance with the 10th contact 1With resistance R 11The point that connects is a Node B, and Node B is connected with the 0th contact through 300 Ω resistance, is the resistance of 10 5 Ω on the bracket panel II ' of second step disc, passes through 2000 Ω resistance R between the brush of the second step disc measuring disk II and the brush of bracket panel II ' 12Connect, the brush of bracket panel II ' connects the 22nd contact of measuring disk I, the 0th contact connecting circuit node A of measuring disk I, bracket panel II ' the 10th contact and 23000 Ω resistance R 13An end tie point be node C, node C is through 50/7 Ω resistance R 15Back and 11.5 Ω range transfer resistance r 1One end is connected in parallel on node F, and node F connects the positive pole of pressure measuring instrument working power; Resistance R 13The other end connect to measure the 0th contact, top of slip III, end the 10th contact of measuring slip III is through 900 Ω resistance R 14Back connecting circuit Node B; Node B and 10350 Ω range transfer resistance r 4One end is connected in parallel on hilted broadsword four and throws range selector K 1* 10 range contacts, range transfer resistance r 4The other end and 1035 Ω range transfer resistance r 3One end is connected in parallel on hilted broadsword four and throws range selector K 1* 1 range contact, range transfer resistance r 3The other end and 103.5 Ω range transfer resistance r 2After one end connects, through 931.5 Ω resistance r 6Connect hilted broadsword four and throw range selector K 1* 0.1 range contact, range transfer resistance r 2The other end and range transfer resistance r 1The other end connect after, through 1033.965 Ω resistance r 5Connect hilted broadsword four and throw range selector K 1* 0.01 range contact, hilted broadsword four is thrown range selector K 1Normally closed contact connect to set up resistance R NThe high potential end; Pressure measuring instrument is used to connect measured " U X" two terminals, anodal terminal is connected with measuring disk I brush, the negative pole terminal is through double-point double-throw switch K 2The back is connected with auxiliary slip III '.
CN2009101554297A 2009-12-14 2009-12-14 Multi-range voltage-measuring instrument Expired - Fee Related CN101718805B (en)

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Application Number Priority Date Filing Date Title
CN2009101554297A CN101718805B (en) 2009-12-14 2009-12-14 Multi-range voltage-measuring instrument

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CN101718805B true CN101718805B (en) 2011-04-06

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