CN201054007Y - Voltage measuring instrument with multiple ranges - Google Patents
Voltage measuring instrument with multiple ranges Download PDFInfo
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- CN201054007Y CN201054007Y CNU2007201097940U CN200720109794U CN201054007Y CN 201054007 Y CN201054007 Y CN 201054007Y CN U2007201097940 U CNU2007201097940 U CN U2007201097940U CN 200720109794 U CN200720109794 U CN 200720109794U CN 201054007 Y CN201054007 Y CN 201054007Y
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Abstract
The utility model relates to a multi-range voltage-measuring instrument, and consists of a first step disc composed of twenty-one 100 Ohms measuring discs, an auxiliary disc I1 containing no resistance and an auxiliary disc I, a second step disc consisting of a measuring disc composed of nine 90 Ohms resistance rings and two 10 Ohms resistors as well as an auxiliary disc composed of ten 5 Ohms resistors, a third step disc composed of ten 10 Ohms measuring discs and replacing discs as well as a fourth step disc. All contact points of the fourth step disc are connected with the corresponding contact points on the measuring disc of the third step disc, the measuring discs are connected with a lead and switched not through a switch, thereby the voltage-measuring instrument can ignore the influence of deviations and thermoemfs while conducting a measurement. The voltage-measuring instrument has four measuring ranges of *10, *1, *0.1 and *0.01, a maximum measured voltage of 2.31 volts and a minimum resolution of 0.1 microvolt.
Description
Technical field
The utility model relates to the instrument that DC voltage is measured.
Background technology
Current for the potential difference meter that four measurement disks is arranged, in the connection between the four measurement disks, 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; Application number 200510062369.6 discloses the new method that the potential difference meter that four measurement disks is arranged solves the switch contact resistance variation, its first, each is made up of second step disc measuring disk and replacement dish, 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, its the 3rd, the 4th step disc respectively has measuring disk, replacement dish and bracket panel are formed, because the 3rd step disc was declined at 10 o'clock, the total resistance of circuit changed when the 4th step disc was put different indicating value, the 3rd step disc was put at 10 o'clock, the total resistance of circuit was constant when the 4th step disc was put different indicating value, the 3rd step disc removes for this reason measuring disk, outside the replacement dish, increased bracket panel distinguish step disc put 10 and the circuit of declining 10 two kinds of situations connect, the 4th 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.Four measurement disks is connected two and measures between terminal, and the brush on the step disc switch is got rid of outside the measurement loop, does not exist switch to switch between the resistance on the four measurement disks, does not also just produce variation; Because 15 ° of angles are rotated in each stepping of potential difference meter step disc switch, every layer of 24 contact that can distribute, the measuring disk of first step disc and replacement dish are 21 contacts, two-layer inside and outside needing, every layer all has resistance, and internal layer resistance is overproof makes troubles to maintenance, the measuring disk of the 4th step disc, replacement dish and each half storey of bracket panel, the step disc switch also needs inside and outside two-layer, and internal layer also has resistance, and maintenance is also inconvenient.
The utility model content
The purpose of this utility model is a kind of voltage-measuring equipment that a plurality of ranges are arranged of design, in the connection of four measurement disks, do not switch by switch, and first step disc cancellation replacement dish, and make four resistance on the step disc can both be contained in one deck.
The technical solution of the utility model is taked like this: from the positive pole of external 15V working power through the resistance measurement network formed by four step discs, range transfer resistance and range selector setting resistance R to 463 Ω
NAnd the lockable adjustable resistance R of 0～1 Ω
P3Again through 0～70 Ω adjustable resistance R
P2And 20 * 68 Ω adjustable resistance R
P1Get back to the negative pole of external 15V working power and form voltage-measuring equipment 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 75K Ω current-limiting resistance R to standard cell E
NNegative pole is formed the voltage-measuring equipment standard loop; Be used to connect measured " U
X" two terminals, anodal terminal is through behind the four measurement disks, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Form the voltage-measuring equipment 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, 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; 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 9 90 Ω to connect into ring-type: the 1st resistance R above 0～8 gear
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end ... welding successively, 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
1Being connected of measuring disk 0 contact of the other end and the 3rd step disc, measuring disk 0 contact of the 3rd step disc 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; The 3rd step disc is made up of measuring disk III that is both 10 * 10 Ω and replacement dish III ', and the brush of the brush of measuring disk III and replacement dish III ' is with a slice metallic brush sheet; The 4th step disc has only measuring disk IV, and the corresponding contact on its each contact and the measuring disk III connects; Bracket panel II ' the 10th contact and 62 Ω range transfer resistance R
20An end be parallel to node A, node A connects the positive pole of voltage-measuring equipment 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, the brush series connection 1000k Ω resistance R of measuring disk IV
15Back and 47.25 Ω resistance R
16An end tie point be circuit node E, the 10th of replacement dish III ' series connection 99950 Ω resistance R
14Back connected node E, 5293.92 Ω resistance R
13One end connected node D, other end connected node E, 47.25 Ω resistance R
16The other end and 55800 Ω resistance R
17An end be connected in range selector K
1* 10 range contacts, 55800 Ω resistance R
17The other end and 5580 Ω resistance R
18An end be connected in range selector K
1* 1 range contact, 5580 Ω resistance R
18The other end and 558 Ω resistance R
19An end connect after through 5022 Ω resistance R
21With range selector K
1* 0.1 range contact connects range transfer resistance R
19The other end and 62 Ω range transfer resistance R
20The other end connect after through 5574.42 Ω resistance R
22With 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 the 10th contact of measuring disk 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, each 11 contact of the bracket panel II ' of second step disc and measuring disk II are distributed in same one deck of switch, resistance is contained in the switch skin, three, the 4th step disc does not all have bracket panel, resistance can be contained in the switch skin, unloads when resistance is overproof and loads onto easily, and this brings convenience for debugging and maintenance; This makes voltage-measuring equipment simple in structure, and volume-diminished has also reduced production cost; On the total circuit partly in voltage-measuring equipment internal compensation loop and work loop, there is not switch, so there is not variation influence, when the reset of voltage-measuring equipment four measurement disks, the zero potential of voltage-measuring equipment is the zero potential that D is ordered, in equalizing network, do not exist working current to flow through lead resistance, so this voltage-measuring equipment zero potential is very little, owing on the total circuit partly in voltage-measuring equipment internal compensation loop and work loop, do not have switch to switch, so this voltage-measuring equipment thermoelectrical potential and variable thermoelectrical potential are also very little.
Description of drawings
Accompanying drawing is the utility model schematic 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, Node B 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, Node B 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 Node B 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 Node B 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 Node B 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 Node B 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 Node B and the node D,
When second step disc was put " 4 ", resistance value was 1120 Ω between Node B and the node D,
When second step disc was put " 5 ", resistance value was 1125 Ω between Node B and the node D,
……
When second step disc was put " 9 ", resistance value was (2110/2+90) Ω=1145 Ω between Node B and the node D, and when second step disc was put " 10 ", resistance value was (2100/2+100) Ω=1150 Ω between Node B and the node D.
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 resistance value between Node B 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.
When three, the 4th step disc was put different indicating value, the resistance between node D and node E changed between 5002.728 Ω～5002.780 Ω, and node E connects 47.25 Ω resistance R
16After, pass through node D to K switch from node A
1* resistance value between 10 range contacts is 6200 Ω, the change in resistance of 0.05 Ω, to the relative variation of 6200 Ω less than 100,000/, influence can be ignored.
Electric current is 2.2mA during the standardization of voltage-measuring equipment working current, when * 10 ranges, passes through node D to K switch from node A
1* 6200 Ω resistance values between 10 range contacts and the resistance R of 62000 Ω
17, resistance R
18, resistance R
19And resistance R
20The sum parallel connection, the electric current that therefore flows through bracket panel II ' is 2mA, flows through resistance R
17, resistance R
18, resistance R
19And resistance R
20Electric current be 0.2mA; When * 1 range, resistance R
17Changed the position, the circuit resistance is constant, and node A arrives range selector K through measuring disk
1* 1 range contact totally 62000 Ω, node A is through resistance R
20, resistance R
19, resistance R
18To range selector K
1* 1 range contact is 6200 Ω, therefore flows through bracket panel II ' process measuring disk to range selector K
1* electric current of 1 range contact is 0.2mA, flows through resistance R
20, resistance R
19And resistance R
18Electric current be 2mA; When * 0.1 range, node A arrives range selector K through Node B
1* 0.1 range contact between, the 6200 Ω resistance resistance R of having connected
17And resistance R
18Sum is 67580 Ω and its parallel resistor R
20And resistance R
19Sum is 620 Ω, and resistance value ratio is 109 times, flows through resistance R
20, resistance R
19Electric current also be 109 times with the current ratio that flows through Node B, so 2.18mA current flowing resistance R
20, resistance R
19, the 0.02mA electric current flows through the 10th the process Node B of bracket panel II ' to range selector K
1* 0.1 range contact, the resistance that back in parallel circuit reduces is by sealing in 5022 Ω resistance R
21The holding circuit resistance is constant; During * 0.01 range, node A arrives range selector K through Node B
1* 0.01 range contact, the 6200 Ω resistance resistance R of having connected
17, resistance R
18And resistance R
19Sum is 68138 Ω and its parallel resistor R
20Be 62 Ω, resistance value ratio is 1099 times, so 2.198mA current flowing resistance R
20, the 0.002mA electric current flows through node A and arrives range selector K through Node B
1* 0.01 range contact, the resistance that back in parallel circuit reduces is by sealing in 5574.42 Ω resistance R
22The holding circuit resistance is constant.
When * 10 ranges, measuring disk II puts " n " [n=1,2,3 ... 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 1m A, 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 1m A.It is 100mV that 1m A electric current flows through the ohmically voltage of 100 Ω, and the every stepping of measuring disk I is 100mV.
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, flows through resistance R
9Electric current be 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, the resistance between 0,1 contact of replacement measuring disk I.
The 2mA working current is divided into three the tunnel: the one tunnel through measuring disk IV through first, second step disc behind node D, another road is through replacement dish III ', and one the tunnel through 5293.92 Ω resistance R again
13, three road electric currents meet at node E.When three, the 4th step disc is put different indicating value between node D and the node E resistance change, three, resistance minimum between node D and node E during the 4th step disc reset indicating value, resistance maximum between node D and node E when three, the 4th step disc is put " 10 " indicating value, get intermediate value, resistance is not having resistance R between node D and the node E when the 3rd, the 4th step disc is put " 5 " indicating value for this reason
13When in parallel is (10
6÷ 11+50) Ω is 0.11mA in order to make the total current that flows through the 3rd, the 4th step disc, with 5293.92 Ω resistance R
13The electric current of shunting 1.89mA; Three, during the 4th step disc reset indicating value, the total current that flows through the 3rd, the 4th step disc is 0.11001mA, and when the 3rd, the 4th step disc was put " 10 " indicating value, the total current that flows through the 3rd, the 4th step disc was 0.10999mA, error is ten thousand/, influence can be ignored; Flow through resistance R
14With resistance R
15The current ratio exact value be 10, when the 3rd, the 4th step disc reset indicating value, flow through resistance R
14With resistance R
15Current ratio be 9.995, when the 3rd, the 4th step disc is put " 10 " indicating value, flow through resistance R
14With resistance R
15Current ratio be 10.005, error is 5/10000ths owing to be last two dishes, influence also can be ignored; The 3rd step disc is got the 0.1mA electric current on the resistance of measuring disk III, and the 4th step disc is got the 0.01mA electric current, and the resistance on the measuring disk III is 10 Ω, and the every stepping of the 3rd step disc is 1mV, and the every stepping of the 4th step disc is 0.1mV.
When * 10 range working current standardization, first step disc is put n
1, second step disc puts n
2, the 3rd step disc puts n
3, the 4th step disc puts n
4, " U at this moment
x" two measure that voltage is between terminal:
U
x＝100n
1+10n
2+1n
3+0.1n
4 (mV)
When * 1 range working current standardization, first step disc is put n
1, second step disc puts n
2, the 3rd step disc puts n
3, the 4th step disc puts n
4, " U at this moment
x" two measure that voltage is between terminal:
U
x＝10n
1+n
2+0.1n
3+0.01n
4 (mV)
When * 0.1 range, first step disc is put n
1, second step disc puts n
2, the 3rd step disc puts n
3, the 4th step disc puts n
4, " U
x" two measure that voltage is between terminal:
U
x＝1n
1+0.1n
2+0.01n
3+0.001n
4 (mV)
During * 0.01 range, when first step disc is put n
1, second step disc puts n
2, the 3rd dish puts n
3, the 4th step disc is put n
4, " U at this moment
x" two measure that voltage is between terminal:
U
x＝0.1n
1+0.01n
2+0.001n
3+0.0001n
4 (mV)
At this moment resolution reaches 0.1 μ V.
Because the electromotive force of standard cell disperses, 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.
Node A is to range selector K
1Normally closed contact between the resistance of four ranges all be 62000/11 Ω, the setting resistance R of 463 Ω
NWith 0～1 Ω adjustable resistance R
P3Be 464 Ω, amount to 6100 Ω, bear about 13.42V voltage; The voltage-measuring equipment external power supply is as adopting dry cell power supply, will ten groups of dry cells series connection, and under new, former affection condition, can both make the working current of voltage-measuring equipment be adjusted to standardization in order to make dry cell, for this reason, get adjustable resistance R
P1Be 20 * 68 Ω, adjustable resistance R
P2Be 0～70 Ω, dry cell voltage usable range is between 13.42V～16.57V, and the suggestion of this voltage-measuring equipment external power supply adopts Xinxin Electronic Instrument Factory, Shanghai to produce YJ49b type stabilized voltage supply, and it has many grades of high stability voltage outputs.
The normalized current of voltage-measuring equipment is such acquisition: 200mV standard signal voltage is pressed polarity and voltage-measuring equipment " U
x" two measure terminal and connect, the total indicating value of each step disc of voltage-measuring equipment is identical with the standard signal magnitude of voltage, 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, repeat once again after, adjustable resistance R
P3Locking, at this moment the working current of voltage-measuring equipment is with regard to standardization.
Claims (1)
1. voltage-measuring equipment that a plurality of ranges are arranged, from the positive pole of external 15V working power through the resistance measurement network formed by four step discs, range transfer resistance and range selector setting resistance R to 463 Ω
NAnd the lockable adjustable resistance R of 0～1 Ω
P3Again through 0～70 Ω adjustable resistance R
P2And 20 * 68 Ω adjustable resistance R
P1Get back to the negative pole of external 15V working power and form voltage-measuring equipment 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 75K Ω current-limiting resistance R to standard cell E
NNegative pole is formed the voltage-measuring equipment standard loop; Be used to connect measured " U
X" two terminals, anodal terminal is through behind the four measurement disks, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Form the voltage-measuring equipment 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, 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; 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 9 90 Ω to connect into ring-type: the 1st resistance R above 0～8 gear
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end ... welding successively, 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
1Being connected of measuring disk 0 contact of the other end and the 3rd step disc, measuring disk 0 contact of the 3rd step disc 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; The 3rd step disc is made up of measuring disk III that is both 10 * 10 Ω and replacement dish III ', and the brush of the brush of measuring disk III and replacement dish III ' is with a slice metallic brush sheet; The 4th step disc has only measuring disk IV, and the corresponding contact on its each contact and the measuring disk III connects; Bracket panel II ' the 10th contact and 62 Ω range transfer resistance R
20An end be parallel to node A, node A connects the positive pole of voltage-measuring equipment 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, the brush series connection 1000k Ω resistance R of measuring disk IV
15Back and 47.25 Ω resistance R
16An end tie point be circuit node E, the 10th of replacement dish III ' series connection 99950 Ω resistance R
14Back connected node E, 5293.92 Ω resistance R
13One end connected node D, other end connected node E, 47.25 Ω resistance R
16The other end and 55800 Ω resistance R
17An end be connected in range selector K
1* 10 range contacts, 55800 Ω resistance R
17The other end and 5580 Ω resistance R
18An end be connected in range selector K
1* 1 range contact, 5580 Ω resistance R
18The other end and 558 Ω resistance R
19An end connect after through 5022 Ω resistance R
21With range selector K
1* 0.1 range contact connects range transfer resistance R
19The other end and 62 Ω range transfer resistance R
20The other end connect after through 5574.42 Ω resistance R
22With 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 the 10th contact of measuring disk III.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201097940U CN201054007Y (en) | 2007-05-29 | 2007-05-29 | Voltage measuring instrument with multiple ranges |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201097940U CN201054007Y (en) | 2007-05-29 | 2007-05-29 | Voltage measuring instrument with multiple ranges |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201054007Y true CN201054007Y (en) | 2008-04-30 |
Family
ID=39393669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201097940U Expired - Lifetime CN201054007Y (en) | 2007-05-29 | 2007-05-29 | Voltage measuring instrument with multiple ranges |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201054007Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710145B (en) * | 2009-12-14 | 2011-04-13 | 骆小君 | Multi-range voltage measuring device |
| CN101710146B (en) * | 2009-12-14 | 2011-08-24 | 骆晓英 | Voltage measurement apparatus |
-
2007
- 2007-05-29 CN CNU2007201097940U patent/CN201054007Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710145B (en) * | 2009-12-14 | 2011-04-13 | 骆小君 | Multi-range voltage measuring device |
| CN101710146B (en) * | 2009-12-14 | 2011-08-24 | 骆晓英 | Voltage measurement apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20070529 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |