CN101034112A - Four measuring ranges potentiometer - Google Patents

Four measuring ranges potentiometer Download PDF

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Publication number
CN101034112A
CN101034112A CN 200710067809 CN200710067809A CN101034112A CN 101034112 A CN101034112 A CN 101034112A CN 200710067809 CN200710067809 CN 200710067809 CN 200710067809 A CN200710067809 A CN 200710067809A CN 101034112 A CN101034112 A CN 101034112A
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resistance
contact
bracket panel
node
range
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CN 200710067809
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CN101034112B (en
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程军
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Abstract

This invention relates to a four range potential meter with three measuring tray used for constant voltage measuring. The initiative input tray composed by measuring tray and assistant tray; the second step input tray has measuring tray composed by 10X110 omega annular resistance net, and assistant tray composed by ten 5 omega resistance; the third tray is double slide wire tray, two measuring tray connect with measuring slide wire by wire, not use switch for switching, remove the impact of variation and thermoelectric force while potential meter measuring, the distinguish ability can reach 0.1 mu V; this invention omits the substitution tray of first and second input trays.

Description

Four-range potentiometer
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 ,-as adopt big brush increasing 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 variation new method of switch contact resistance, 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 a kind of four-range potentiometer that three measuring disk are arranged, 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: electric current from the positive pole of potential difference meter 4.5V working power through the setting resistance R of the resistance measurement network on two step discs and the two slide wire disc to 463 Ω NAnd the lockable adjustable resistance R of 0～0.7 Ω P3Again through 350 Ω adjustable 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 potential difference meter 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 P3, process 100K Ω current-limiting resistance R is to standard cell E again NNegative pole is formed the potential difference meter standard loop; Be used to connect measured " U X" two terminals, behind the resistor network of anodal terminal through two measuring disk and two slide wire discs, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts 2Form potential difference meter to the negative pole terminal and measure the loop; First step disc has measuring disk I, it has 0,1,2 ... 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 " brush be connected bracket panel I ' and bracket panel I with lead " 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 ', 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 ... welding successively, the 10th resistance R 10The other end and the 11st resistance R 11An end connects is circuit node A, the 11st resistance R 11The other end and the 1st resistance R 1The other end be connected in 0 point of measuring slip III, 0 that measures slip III is circuit node B, 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 4Resistance 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 connected resistance R through 200 Ω resistance with the 10th contact 1With resistance R 11The Node B that connects o'clock is connected with 0 contact through 300 Ω resistance, is the resistance of 10 * 5 Ω on the bracket panel II ' of second step disc; The 10th of bracket panel II ' and 12 Ω range transfer resistance R 14An end be parallel to node C, node C connects the positive pole of potential difference meter 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 connects the brush and bracket panel I of bracket panel I ' after through 1900 Ω resistance " the tie point that is connected of brush; other contacts connection measuring disk I 22nd contact of bracket panel I ' except that 0 contact; measuring disk I the 0th; 1 contact is connected with node A; 0 contact of bracket panel I ' is connected with Node B after through 2200 Ω resistance, measurement slip III the 10th o'clock is through 45 Ω resistance R 13Back and 10800 Ω range transfer resistance R 17End connected node D, node D and a 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, 15 ° of angles are rotated in each stepping of switch, 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 potential difference meter simple in structure like this, volume-diminished has also reduced production cost; On the total circuit partly in potential difference meter internal measurement loop and work loop, there is not switch, so there is not variation influence, when three measuring disk resets of potential difference meter, the potential difference meter working current converges at the B point, the zero potential of potential difference meter is a B point current potential, in measuring the loop, do not exist working current to flow through lead resistance, so this potential difference meter zero potential is very little; Two slide wire resistance thickness materials are identical, and the thermoelectrical potential equal and opposite in direction of generation, direction are opposite, so this potential difference meter thermoelectrical potential is also very little, therefore, when * 0.01 range, resolution were 0.1 μ V, this potential difference meter 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 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 5,6 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 4,7 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 3,8 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 2,9 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 1,10 contacts are connected with corresponding point on the resistance ring through 200 Ω resistance; When measuring disk II reset, the brush of measuring disk II is between the Node B being the connections of 300 Ω resistance.
The first step disc reset, second step disc are put " n " (n=0,1,2,3 ... 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 B, 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 B, is 1100 Ω therefore.
When first, second step disc during not reset, except that second step disc was put " 10 ", the brush of bracket panel I ' and the calculating of the resistance value between the Node B need be carried 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 B: establish 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)＝110×110/11×110Ω＝10Ω
r 1”＝(R 2+R 3+…+R 9+R 10)×R 1/(R 1+R 2+…+R 10+R 11)＝9×110×110/11×110Ω＝90Ω
Resistance value equals (2100 Ω+r between the brush of bracket panel I ' and the Node B 1) * (1900 Ω ++ 200 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 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 (2100 Ω+r between the brush of bracket panel I ' and the Node B 2) * (1900 Ω+120 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 B,
When second step disc was put " 4 ", resistance value was 1120 Ω between the brush of bracket panel I ' and the Node B,
When second step disc was put " 5 ", resistance value was 1125 Ω between the brush of bracket panel I ' and the Node B,
……
When second step disc was put " 10 ", resistance value was 1150 Ω between the brush of bracket panel I ' and the Node B.Because the every stepping of measuring disk II increases by 5 Ω, so the every stepping of bracket panel II ' reduces by 5 Ω, makes the total resistance of circuit constant; When the first or second step disc reset, the brush of bracket panel I ' and the resistance value between the Node B are 1100 Ω, and 10 * 5 Ω resistance of bracket panel II ' all enter circuit.
Node C arrives node D totally 1200 Ω through measuring disk, and node C 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 C and the node D 14Resistance R 15Sum and 13080 Ω parallel resistor values, 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 14With 13188 Ω parallel resistor values, the resistance that circuit reduces is by sealing in 1078.92 Ω resistance R 18The holding circuit resistance is constant;
When * 10 ranges, node C is 1155 Ω through Node B to the resistance between the 10th of the measurement slip III, adds 45 Ω resistance R 13Arrive node D totally 1200 Ω, node C is through resistance R 14, resistance R 15To resistance R 16To node D is 12000 Ω, and the electric current the during standardization of potential difference meter working current is 2.2mA, and the 2mA electric current flows through the 10th the process Node B of bracket panel II ' to range selector K 1* 10 range contacts, 0.2mA flows through resistance R 14, resistance R 15, resistance R 16To range selector K 1* 10 range contacts; Measuring disk II puts " 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 1900 Ω resistance R 12To intersection point Q nResistance value is equal, when measuring disk II puts " 10 ", and 1900 Ω resistance R 12Add 200 Ω resistance and equate with the resistance value of measuring disk I, so flow through measuring disk I and 1900 Ω resistance R to the resistance value of node C 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, 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; (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 * 10mV; When measuring disk I and measuring disk II reset, electric current is without resistance R 11, U AB=0mV; When not reset of measuring disk I, the electric current that flows through measuring disk I is superimposed upon on the measuring disk II at the 100mV voltage between node A, the B, replaces the resistance between 0,1 contact, and 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×n 2/11×110+2×0.5n 3(mV)
＝100n 1+10n 2+1n 3 (mV)
During * 1 range, node C 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 C 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 15Be 120 Ω, 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 C 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 0～0.7 Ω P3, variation range that can the coverage criteria cell emf.
Potential difference meter 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 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 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 potential difference meter " U x" two measure terminal and connect, it is identical with the standard signal magnitude of voltage that potential difference meter 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, potential difference meter is standard according to this.

Claims (1)

  1. A kind of four-range potentiometer that three measuring disk are arranged, electric current from the positive pole of potential difference meter 4.5V working power through the resistance measurement network formed by two step discs, two slide wire disc and range transfer resistance setting resistance R to 463 Ω NAnd the lockable adjustable resistance R of 0～0.7 Ω P3Again through 350 Ω adjustable 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 potential difference meter 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 P2Sliding contact, again through 100K Ω current-limiting resistance R to standard cell E NNegative pole is formed the potential difference meter 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 potential difference meter to the negative pole terminal and measure the loop; It is characterized in that first step disc has measuring disk I, it has 0,1,2 ... 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 " brush be connected bracket panel I ' and bracket panel I with lead " 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 ', 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 ... welding successively, the 10th resistance R 10The other end and the 11st resistance R 11An end connects is circuit node A, the 11st resistance R 11The other end and the 1st resistance R 1The other end be connected in 0 point of measuring slip III, 0 that measures slip III is circuit node B, 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 connected resistance R through 200 Ω resistance with the 10th contact 1With resistance R 11The Node B that connects o'clock is connected with 0 contact through 300 Ω resistance, is the resistance of 10 * 5 Ω on the bracket panel II ' of second step disc; The 10th of bracket panel II ' and 12 Ω range transfer resistance R 14An end be parallel to node C, node C connects the positive pole of potential difference meter 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 connects the brush and bracket panel I of bracket panel I ' after through 1900 Ω resistance " the tie point that is connected of brush; other contacts connection measuring disk I 22nd contact of bracket panel I ' except that 0 contact; measuring disk I the 0th; 1 contact is connected with node A; 0 contact of bracket panel I ' is connected with Node B after through 2200 Ω resistance, measurement slip III the 10th o'clock is through 45 Ω resistance R 13Back and 10800 Ω range transfer resistance R 17End connected node D, node D and a 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 '.
CN200710067809A 2007-04-03 2007-04-03 Four measuring ranges potentiometer Expired - Fee Related CN101034112B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2530071B1 (en) * 1982-07-09 1985-10-25 Commissariat Energie Atomique HIGH INSULATION AND LOW CONSUMPTION AUTOMATIC SWITCH
CN100394200C (en) * 2004-10-28 2008-06-11 圆创科技股份有限公司 Current detection circuit
CN100410668C (en) * 2005-12-30 2008-08-13 骆乃光 Four-measuring range potential difference meter with four measurng disks and reversing branch
CN201053991Y (en) * 2007-04-03 2008-04-30 程军 Four-range potentiometer

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