CN100523828C - Voltage measurer with wide measuring range - Google Patents

Voltage measurer with wide measuring range Download PDF

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Publication number
CN100523828C
CN100523828C CNB2007100689527A CN200710068952A CN100523828C CN 100523828 C CN100523828 C CN 100523828C CN B2007100689527 A CNB2007100689527 A CN B2007100689527A CN 200710068952 A CN200710068952 A CN 200710068952A CN 100523828 C CN100523828 C CN 100523828C
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resistance
contact
node
bracket panel
range
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CN101055292A (en
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张春雷
方李
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Abstract

A wide-range voltage measuring instrument for DC voltage measurement includes a first stepping panel composed of a measuring panel having 21x100 ohm and bracket panel I' and I'' without resistance, a second stepping panel comprising a measuring panel formed of a ring resistance of 9x90 ohm and two 10 ohm resistances meshwork, a bracket panel formed by a 10x5 ohm, a third stepping panel which is a dual-sliding panel. The two measuring panels and measuring sliding are connected by conductors without on-off switch, which is capable of non-existing variation and thermal potential effect when measuring by voltage measuring instrument, and omitting substitution panel of the first stepping panel and the second stepping panel. The voltage measuring instrument is provided with four extended ranges of x10, x1, x0.1 and x0.01 with the maximum measuring voltage of 2.31V, the minimum resolution of 0.1muV.

Description

The voltage measuring apparatus that measurement range is very wide
Technical field
The present invention relates to 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. ZL200520101772.0 has announced that the potential difference meter that three measuring disk are arranged solves the new method of switch contact resistance variation, its first, second step disc respectively has measuring disk, replacement dish and bracket panel are formed, measuring disk is identical with resistance on the replacement dish, resistance of the every increase of measuring disk, the replacement dish just reduces same resistance, 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, first step disc removes for this reason measuring disk, outside the replacement dish, increased bracket panel distinguish step disc put 0 and the circuit of declining 0 two kinds of situations connect, second step disc has also increased bracket panel, has 10 resistance to insert or cut out several resistance respectively above and makes the total resistance of circuit constant.Two measuring disk connect the back and are connected two with slide wire disc and measure between terminals, brush on the step disc switch is got rid of measured outside the loop, do not exist switch to switch between the resistance on three measuring disk, also just do not produce variation; Because first, second step disc all has the replacement dish, has increased first, second step disc switch and has been welded with the number of plies of resistance, thereby increased the volume of instrument, also make switch and apparatus structure become complicated.
Summary of the invention
The objective of the invention is to design the very wide voltage measuring apparatus of a kind of measurement range, telophragma does not switch by switch in the connection of three measuring disk, first, second step disc cancellation replacement dish, and four range conversions are arranged, make resolution reach 0.1 μ V.
Technical scheme of the present invention is taked like this: from the positive pole of voltage measuring apparatus 4.5V working power through the resistance measurement network formed by two step discs, two slide wire disc, range transfer resistance and a range selector setting resistance R to 463 Ω NAnd the lockable adjustable resistance R of 0～1 Ω P3Again through 350 Ω resistance R 0, 0～16 Ω adjustable resistance R P2And 22 * 15 Ω adjustable resistance R P1Get back to the negative pole of working power and form voltage measuring apparatus work loop; 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 P3Sliding contact, again through 100K Ω current-limiting resistance R to standard cell E NNegative pole is formed the voltage measuring apparatus standard loop; Be used to connect measured " U X" two terminals, anodal terminal through two measuring disk and two slide wire disc after, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2Form the voltage measuring apparatus equalizing network to the negative pole terminal; It is characterized in that first step disc has measuring disk I, it has 0～22 totally 23 gears, except that between 0,1 contact, directly connecting, connect one of 100 Ω resistance between all the other each grade contacts, other has bracket panel I ' and bracket panel I "; the brush of bracket panel I ' and bracket panel I " the tie point that is connected with lead of brush be circuit node B, bracket panel I ' and bracket panel I " 0 contact isolated, all the other all contacts connect with lead; The 3rd dish is two slide wire discs, two slip thickness materials are identical, resistance all is 5 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 0.5 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 ', and measuring disk II has 0～10 totally 11 gears, has the resistance of 9 90 Ω to connect into ring-type above 0～8 gear: 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, the 8th resistance R 8The other end and the 9th resistance R 9An end tie point be circuit node H, the 9th resistance R 9The other end and the 1st resistance R 1The other end and the 3rd dish measure 0 of slip III being connected, 0 that measures slip III is circuit node D, resistance R 1With resistance R 2Tie point be connected resistance R through 120 Ω resistance with the 1st contact 2With resistance R 3Tie point be connected resistance R through 60 Ω resistance with the 2nd contact 3With resistance R 4Tie point be connected resistance R through 20 Ω resistance with the 3rd contact 4With resistance R 5Tie point be connected resistance R 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 through 20 Ω resistance with the 6th contact 7With resistance R 8Tie point be connected resistance R through 60 Ω resistance with the 7th contact 8With resistance R 9Tie point be that node H one tunnel is connected with the 8th contact through 120 Ω resistance, another road is connected with the 9th contact through 110 Ω resistance to node F after through 10 Ω resistance again, node F through 10 Ω resistance to node C, node C is connected with the 10th contact through 100 Ω resistance, " 0 " contact of measuring disk II is connected with node D through 200 Ω resistance, is the resistance of 10 5 Ω on the bracket panel II ' of second step disc; Bracket panel II ' the 10th contact and 12 Ω range transfer resistance R 14An end be parallel to node A, node A connects the positive pole of voltage measuring apparatus working power, 0 contact of bracket panel II ' connects bracket panel I " 0 contact, the brush of bracket panel II ' connects bracket panel I " other contact except that 0 contact, the brush of measuring disk II is through 2000 Ω resistance R 12Back connected node B, bracket panel I ' other contacts except that 0 contact connect measuring disk I the 22nd contact, measuring disk I the 0th, 1 contact is connected with node C, and 0 contact of bracket panel I ' is connected with node D after through 2200 Ω resistance, measures slip III the 10th o'clock through 45 Ω resistance R 13Back and 10800 Ω range transfer resistance R 17The tie point of one end is node E, node E and range selector K 1* 10 range contacts connect range transfer resistance R 17The other end and 1080 Ω range transfer resistance R 16An end connect range selector K 1* 1 range contact, range transfer resistance R 16The other end and 108 Ω range transfer resistance R 15An end connect after through 972 Ω resistance R 19With range selector K 1* 0.1 range contact connects range transfer resistance R 15The other end and 12 Ω range transfer resistance R 14The other end connect after through 1078.92 Ω resistance R 18With range selector K 1* 0.01 range contact connects range selector K 1Normally closed contact connect to set up resistance R NNoble potential one end; Be used to connect measured " U X" two measure terminal, anodally be connected with measuring disk I brush, negative pole passes through double-point double-throw switch K 2The back is connected with auxiliary slip III '.
By above technical scheme, first step disc need not the replacement dish, does not all have resistance on the two-layer bracket panel, can be contained in the switch nexine, and measuring disk I is contained in the switch skin; Second step disc need not the replacement dish, and each stepping of switch rotates 15 0The angle, every layer of 24 contact that distributes deduct two grades of location, each 11 contact of the bracket panel II ' of second step disc and measuring disk II just in time are distributed in same one deck of switch, respectively account for half cycle, and resistance is contained in the switch skin, unload when resistance is overproof and load onto easily, this brings convenience for debugging and maintenance; Make voltage measuring apparatus simple in structure like this, volume-diminished has also reduced production cost; On the total circuit partly in voltage measuring apparatus internal measurement loop and work loop, there is not switch, so there is not variation influence, when three measuring disk resets of voltage measuring apparatus, the voltage measuring apparatus working current converges at the D point, the zero potential of voltage measuring apparatus is exactly the zero potential that D is ordered, in measuring the loop, do not exist working current to flow through lead resistance, so this voltage measuring apparatus zero potential is very little; Two slide wire resistance thickness materials are identical, the thermoelectrical potential equal and opposite in direction, the direction that produce are opposite, so this voltage measuring apparatus thermoelectrical potential is also very little, therefore, when * 0.01 range, resolution were 0.1 μ V, this voltage measuring apparatus is measured also can obtain good repeatability.
Description of drawings
Accompanying drawing is a principle of the invention circuit.
Embodiment
Among the figure, measuring disk II has 9 the 90 end to end resistance rings of Ω between 1～8 contact, when measuring disk II puts " 4 ", " 5 ", the brush of measuring disk II is to being that 5 90 Ω resistance are in parallel with 4 90 Ω resistance between the node D, back in parallel resistance is 200 Ω to the maximum, other contact of measuring disk II all will be connected to 200 Ω to the resistance between the node D, and corresponding point directly are connected on " 4 ", " 5 " contact and the resistance ring; When measuring disk II put " 3 " or puts " 6 ", the brush of measuring disk II was to being that 3 90 Ω resistance are in parallel with 6 90 Ω resistance between the node D, and back in parallel resistance is 180 Ω, so 3,6 contacts are connected with corresponding point on the resistance ring through 20 Ω resistance; When measuring disk II put " 2 " or puts " 7 ", the brush of measuring disk II was to being that 2 90 Ω resistance are in parallel with 7 90 Ω resistance between the node D, and back in parallel resistance is 140 Ω, so 2,7 contacts are connected with corresponding point on the resistance ring through 60 Ω resistance; When measuring disk II set or when putting " 8 ", the brush of measuring disk II is to being that 1 90 Ω resistance is in parallel with 8 90 Ω resistance between the node D, and back in parallel resistance is 80 Ω, so 1,8 contacts are connected with corresponding point on the resistance ring through 120 Ω resistance; When measuring disk II puts " 9 ", the brush of measuring disk II is to being that 110 Ω resistance add 10 Ω resistance and add that 80 Ω connect into 200 Ω resistance on the resistance ring again between the node D, when measuring disk II put " 10 ", the brush of measuring disk II was to being that 100 Ω resistance add 20 Ω resistance and add that 80 Ω connect into 200 Ω resistance on the resistance ring again between the node D.When measuring disk II reset, the brush of measuring disk II is to being that 200 Ω resistance connect between the node D,
The first step disc reset, second step disc are put " n " (n=0,1,2,3 ... 9,10) time, the brush of bracket panel I ' is that two resistance that are both 2200 Ω are in parallel with resistance value between the node D, is 1100 Ω therefore.
First step disc is put " n " (n=0,1,2,3 ... 22), during the second step disc reset, the brush of bracket panel I ' is that two resistance that are both 2200 Ω are in parallel with resistance value between the node D, is 1100 Ω therefore.
When first, second step disc during not reset, the calculating of the resistance value between the brush of bracket panel I ' and the node D removes second step disc and puts outside " 8,9,10 ", all needs to carry out triangle-star conversion.
During the second step disc set, the calculating of resistance value between the brush of bracket panel I ' and the node D: establish resistance (R 2+ R 3+ ... + R 8) and resistance R 9The both sides resistance is equivalent to resistance r 1, resistance R 9With resistance R 1The both sides resistance is equivalent to resistance r 1' resistance (R 2+ R 3+ ... + R 8) 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 8) * R 9/ (R 1+ R 2+ ... + R 9)=7 * 90 * 90/9 * 90 Ω=70 Ω
r 1’＝R 1×R 9/(R 1+R 2+…+R 9)＝90×90/9×90Ω＝10Ω
r 1”＝(R 2+R 3+…+R 9)×R 1/(R 1+R 2+…+R 9)＝7×90×90/9×90Ω＝70Ω
Resistance value equals (2120 Ω+r between the brush of bracket panel I ' and the node D 1) * (2120 Ω+r 1")/(2 * 2190) Ω+r 1'=2190 Ω/2+10 Ω=1095 Ω+10 Ω=1105 Ω
When second step disc is put " 2 ", the calculating of resistance value between the brush of bracket panel I ' and the node D: establish resistance (R 3+ R 4+ ... + R 8) and resistance R 9The both sides resistance is equivalent to resistance r 2, resistance R 9With resistance (R 1+ R 2) the both sides resistance is equivalent to resistance r 2' resistance (R 3+ R 4+ ... + R 8) 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=60 Ω r 2'=20 Ω r 2"=120 Ω
Resistance value equals (2120 Ω+r between the brush of bracket panel II ' and the node D 2) * (2000 Ω+60 Ω+r 2")/(2 * 2180) Ω+r 2'=2180 Ω/2+20 Ω=1090 Ω+20 Ω=1110 Ω.
In like manner, when second step disc was put " 3 ", resistance value was 1115 Ω between the brush of bracket panel I ' and the node D,
When second step disc was put " 4 ", resistance value was 1120 Ω between the brush of bracket panel I ' and the node D,
When second step disc was put " 5 ", resistance value was 1125 Ω between the brush of bracket panel I ' and the node D,
......
When second step disc was put " 9 ", resistance value was (2110/2+90) Ω=1145 Ω between the brush of bracket panel I ' and the node D,
When second step disc was put " 10 ", resistance value was (2100/2+100) Ω=1150 Ω between the brush of bracket panel I ' and the node D.Increase by 5 Ω in the every stepping of measuring disk II, so the every stepping of bracket panel II ' reduces by 5 Ω, make the total resistance of circuit constant.
When the first or second step disc reset, the resistance value between the brush of bracket panel I ' and the node D is 1100 Ω, and 10 * 5 Ω resistance of bracket panel II ' all enter circuit, and making the resistance value between node A and the node D is that 1150 Ω remain unchanged.
Node A arrives node E totally 1200 Ω through measuring disk, and node A is through resistance R 14, resistance R 15, resistance R 16Also 1200 Ω, * 10, * during 1 range, resistance R 17Changed the position, the circuit resistance is constant; When * 0.1 range, be the resistance R of 120 Ω between node A and the node E 14Resistance R 15Sum is in parallel with 13080 Ω resistance, and the resistance that circuit reduces is by sealing in 972 Ω resistance R 19The holding circuit resistance is constant; When * 0.01 range, be the resistance R of 12 Ω between node C and the node D 14In parallel with 13188 Ω resistance, the resistance that circuit reduces is by sealing in 1078.92 Ω resistance R 18The holding circuit resistance is constant;
When * 10 ranges, node A is 1155 Ω through node D to the resistance between the 10th of the measurement slip III, adds 45 Ω resistance R 13Arrive node E totally 1200 Ω, node A is through resistance R 14, resistance R 15To resistance R 16To node E is 12000 Ω, and the electric current the during standardization of voltage measuring apparatus working current is 2.2mA, and 0.2mA flows through resistance R 14, resistance R 15, resistance R 16To range selector K 1* 10 range contacts, to measuring slip III the 10th point, measuring disk II puts " n " [n=1,2,3 to 2m A electric current from node A process node D ... 8 (r 8=0) in the time of], I is to being equivalent to resistance r for Node B process measuring disk n, r n', r n" intersection point Q n(n=1,2,3 ... 8) with through 2000 Ω resistance R 12To intersection point Q nResistance value equates that when measuring disk II put " 9 ", I was to the resistance value of node F and through 2000 Ω resistance R for Node B process measuring disk 12Resistance value to node F all equals 2110 Ω, so flow through measuring disk I and 2000 Ω resistance R 12Electric current respectively be 1mA, when measuring disk II puts " 10 ", Node B through measuring disk I to the resistance value of node C and through 2000 Ω resistance R 12Resistance value to node C all equals 2100 Ω, so flow through measuring disk I and 2000 Ω resistance R 12Electric current also respectively be 1mA.
For 9 the 90 Ω end to end resistance rings of measuring disk II between 1～8 contact, resistance R during measuring disk II set 1To be all 90 Ω resistance in parallel with 8 resistances, and the electric current that flows through resistance R 9 is 1/9mA, the voltage U between node H and the node D HD=1/9 * 90mV=10mV; Resistance (R when measuring disk II puts " 2 " 1+ R 2) to be all 90 Ω resistance in parallel with 7 resistances, flows through resistance R 9Electric current be 2/9mA, the voltage U between node H and the node D HD=2/9 * 90mV=20mV; (n=1,2,3 when in like manner, measuring disk II puts " n " ... 8) voltage U between resistance nodes H and the node D HD=n * 10mV; When measuring disk II puts " 9 ", the voltage U between node F and the node D on the 80 Ω resistance rings HD=80mV adds 10 Ω resistance R 10Last 10mV, 90mV altogether; When measuring disk II puts " 10 ", the voltage U between node C and the node D on the 80 Ω resistance rings HD=80mV adds 10 Ω resistance R 10Last 10mV and 10 Ω resistance R 11Last 10mV, 100mV altogether; When measuring disk I and measuring disk II reset, electric current is without resistance R 9, U CD=0mV; The electric current that flows through measuring disk I when not reset of measuring disk I is superimposed upon on the measuring disk II at the 100mV voltage between node C, the D, resistance between 0,1 contact of replacement measuring disk I, during the working current standardization, the every stepping of first step disc is 100mV, the every stepping of second step disc is 10mV, and the electric current on the 3rd dish is 2mA, and every big lattice resistance is 0.5 Ω, voltage on every big lattice is 2 * 0.5 Ω=1mV, and therefore every little lattice are 100 μ V; Measure terminals and connect measured when two of voltage measuring apparatus, when rotation voltage measuring apparatus measuring disk makes the galvanometer nulling, voltage measuring apparatus equates with measured voltage that at two voltages of measuring between terminal at this moment the indicating value on the voltage measuring apparatus measuring disk is measured magnitude of voltage.This voltage measuring apparatus is 2.30V at * 10 range highest measurement voltages, and minimum resolution is 100 μ V.
During * 1 range, node A through Node B to the resistance R of having connected of 1155 Ω resistance between the 10th of the measurement slip III 13, resistance R 17Sum is 12000 Ω and its parallel resistor R 14, resistance R 15, resistance R 16Sum is 1200 Ω, and the 0.2mA electric current flows through the 10th the process Node B of bracket panel II ' to measuring slip III the 10th point, 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 A through Node B to the resistance R of having connected of resistance between the 10th of the measurement slip III 13, resistance R 17And resistance R 16Sum is 13080 Ω and its parallel resistor R 14, resistance R 15Sum is 120 Ω, and resistance value ratio is 109 times, flows through resistance R 14, resistance R 15Electric current also be 109 times with the current ratio that flows through Node B, so 2.18mA current flowing resistance R 14, resistance R 15, the 0.02mA electric current flows through the 10th the process Node B of bracket panel II ' to measuring slip III the 10th point, 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 A through Node B to the resistance R of having connected of resistance between the 10th of the measurement slip III 13, resistance R 17, resistance R 16And resistance R 15Sum is 13188 Ω and its parallel resistor R 14Be 12 Ω, resistance value ratio is 1099 times, so 2.198mA current flowing resistance R 14, the 0.02mA electric current flows through the 10th the process Node B of bracket panel II ' to measuring slip III the 10th point, 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 2.2mA, therefore sets up resistance R NGet 463 Ω, add the lockable adjustable resistance R of 0～1 Ω P3, variation range that can the coverage criteria cell emf.
Voltage measuring apparatus adopts 3 groups of dry cell power supplies, electromotive force was about 1.65V when dry cell was new, with old to 1.4V when following, the electric current shakiness, in order to make dry cell under new, former affection condition, can both make the working current of voltage measuring apparatus be adjusted to standardization, resistance R for this reason 0Get 350 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 voltage measuring apparatus " U x" two measure terminal and connect, it is identical with the standard signal magnitude of voltage that voltage measuring apparatus 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, voltage measuring apparatus is standard according to this.

Claims (1)

1, the voltage measuring apparatus that a kind of measurement range is very wide, from the positive pole of voltage measuring apparatus 4.5V working power through the resistance measurement network formed by two step discs, two slide wire disc, range transfer resistance and a range selector setting resistance R to 463 Ω NAnd the lockable adjustable resistance R of 0～1 Ω P3Again through 350 Ω resistance R 0, 0～16 Ω adjustable resistance R P2And 22 * 15 Ω adjustable resistance R P1Get back to the negative pole of working power and form voltage measuring apparatus work loop; 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 P3Sliding contact, again through 100K Ω current-limiting resistance R to standard cell E NNegative pole is formed the voltage measuring apparatus standard loop; Be used to connect measured " U X" two terminals, anodal terminal through two measuring disk and two slide wire disc after, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2Form the voltage measuring apparatus equalizing network to the negative pole terminal; It is characterized in that first step disc has measuring disk I, it has 0～22 totally 23 gears, except that between 0,1 contact, directly connecting, connect one of 100 Ω resistance between all the other each grade contacts, other has bracket panel I ' and bracket panel I "; the brush of bracket panel I ' and bracket panel I " the tie point that is connected with lead of brush be circuit node B, bracket panel I ' and bracket panel I " 0 contact isolated, all the other all contacts connect with lead; The 3rd dish is two slide wire discs, two slip thickness materials are identical, resistance all is 5 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 0.5 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 ', and measuring disk II has 0～10 totally 11 gears, has the resistance of 9 90 Ω to connect into ring-type above 0～8 gear: 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, the 8th resistance R 8The other end and the 9th resistance R 9An end tie point be circuit node H, the 9th resistance R 9The other end and the 1st resistance R 1The other end and the 3rd dish measure 0 of slip III being connected, 0 that measures slip III is circuit node D, resistance R 1With resistance R 2Tie point be connected resistance R through 120 Ω resistance with the 1st contact 2With resistance R 3Tie point be connected resistance R through 60 Ω resistance with the 2nd contact 3With resistance R 4Tie point be connected resistance R through 20 Ω resistance with the 3rd contact 4With resistance R 5Tie point be connected resistance R 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 through 20 Ω resistance with the 6th contact 7With resistance R 8Tie point be connected resistance R through 60 Ω resistance with the 7th contact 8With resistance R 9Tie point be that node H one tunnel is connected with the 8th contact through 120 Ω resistance, another road is connected with the 9th contact through 110 Ω resistance to node F after through 10 Ω resistance again, node F through 10 Ω resistance to node C, node C is connected with the 10th contact through 100 Ω resistance, " 0 " contact of measuring disk II is connected with node D through 200 Ω resistance, is the resistance of 10 5 Ω on the bracket panel II ' of second step disc; Bracket panel II ' the 10th contact and 12 Ω range transfer resistance R 14An end be parallel to node A, node A connects the positive pole of voltage measuring apparatus working power, 0 contact of bracket panel II ' connects bracket panel I " 0 contact, the brush of bracket panel II ' connects bracket panel I " other contact except that 0 contact, the brush of measuring disk II is through 2000 Ω resistance R 12Back connected node B, bracket panel I ' other contacts except that 0 contact connect measuring disk I the 22nd contact, measuring disk I the 0th, 1 contact is connected with node C, and 0 contact of bracket panel I ' is connected with node D after through 2200 Ω resistance, measures slip III the 10th o'clock through 45 Ω resistance R 13Back and 10800 Ω range transfer resistance R 17The tie point of one end is node E, node E and range selector K 1* 10 range contacts connect range transfer resistance R 17The other end and 1080 Ω range transfer resistance R 16An end connect range selector K 1* 1 range contact, range transfer resistance R 16The other end and 108 Ω range transfer resistance R 15An end connect after through 972 Ω resistance R 19With range selector K 1* 0.1 range contact connects range transfer resistance R 15The other end and 12 Ω range transfer resistance R 14The other end connect after through 1078.92 Ω resistance R 18With range selector K 1* 0.01 range contact connects range selector K 1Normally closed contact connect to set up resistance R NNoble potential one end; Be used to connect measured " U X" two measure terminal, anodally be connected with measuring disk I brush, negative pole passes through double-point double-throw switch K 2The back is connected with auxiliary slip III '.
CNB2007100689527A 2007-05-29 2007-05-29 Voltage measurer with wide measuring range Expired - Fee Related CN100523828C (en)

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Application Number Priority Date Filing Date Title
CNB2007100689527A CN100523828C (en) 2007-05-29 2007-05-29 Voltage measurer with wide measuring range

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CN101055292A CN101055292A (en) 2007-10-17
CN100523828C true CN100523828C (en) 2009-08-05

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