CN101055279B - Portable potentiometer - Google Patents
Portable potentiometer Download PDFInfo
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- CN101055279B CN101055279B CN200710068938A CN200710068938A CN101055279B CN 101055279 B CN101055279 B CN 101055279B CN 200710068938 A CN200710068938 A CN 200710068938A CN 200710068938 A CN200710068938 A CN 200710068938A CN 101055279 B CN101055279 B CN 101055279B
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Abstract
A portable potential difference meter for DC voltage measurement includes a first stepping panel composed of a measuring panel and two bracket panels without welding resistance, a second stepping panel comprising a measuring panel formed of a 10x10 ohm ring resistance meshwork and a 1 ohm resistance, a bracket panel formed by a ten 0.5 ohm resistances, a third stepping panel comprising of a measuring panel of 10x1 ohm and a substitution panel. Each contact of the fourth stepping panel is connected with the corresponding contact of the measuring panel of the third stepping panel, and the brush of the fourth stepping panel series connected with a 100 kilo ohm resistance, the substitution panel of the third stepping panel series connected with a 9995 ohm resistance are parallel together with a 529.392 ohm resistance in the circuit, the measuring panels are connected by conductors without on-off switch, which is capable of ignoring variation and potential effect when measuring by potential difference meter.
Description
Technical field
The present invention relates to 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 200510062365.8 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.
Summary of the invention
The objective of the invention is to design a kind of portable potentiometer, in the connection of four measurement disks, do not switch by switch, first step disc cancellation replacement dish, and make four resistance on the step disc can both be contained in one deck.
Technical scheme of the present invention is taked like this: pass through by the setting resistance R of the resistance measurement network on four step discs to 509 Ω from the positive pole of potential difference meter 3V working power
NAnd the lockable adjustable resistance R of 0～1 Ω
P3, again to 250 Ω resistance R
0, through the adjustable resistance R of 10 * 25 Ω
P1And 0～27 Ω adjustable resistance R
P2Get back to the negative pole of working power and form potential difference meter work loop; Standard cell E
NAnodal arriving through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts set up resistance R
NAnd lockable adjustable resistance R
P3, process 75K 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, anodal terminal is through behind the resistor network of four measurement disks, again through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts to negative pole terminal composition potential difference meter equalizing network; It is characterized in that first step disc has measuring disk I, it has 0～22 totally 23 gears, except that between 0,1 contact, directly connecting, connect one of 10 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, 0 contact of 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 ', and measuring disk II has 0～10 totally 11 gears, the resistance of 10 10 Ω is arranged, the 1st resistance R above 0～9 gear
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end, resistance R
3The other end welds the 4th resistance R
4One end, resistance R
4The other end welds the 5th resistance R
5One end, resistance R
5The other end welds the 6th resistance R
6One end, resistance R
6The other end welds the 7th resistance R
7One end, resistance R
7The other end welds the 8th resistance R
8One end, resistance R
8The other end welds the 9th resistance R
9One end, the 9th resistance R
9The other end and the 10th resistance R
10The tie point that connects of an end be circuit node F, the 10th resistance R
10The other end and the 1st resistance R
1The other end be connected in 0 contact of measuring disk in 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 16 Ω resistance with the 1st contact
2With resistance R
3Tie point be connected resistance R through 9 Ω resistance with the 2nd contact
3With resistance R
4Tie point be connected resistance R through 4 Ω resistance with the 3rd contact
4With resistance R
5Tie point be connected resistance R through 1 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 through 1 Ω resistance with the 6th contact
7With resistance R
8Tie point be connected resistance R through 4 Ω resistance with the 7th contact
8With resistance R
9Tie point be connected resistance R through 9 Ω resistance with the 8th contact
9With resistance R
10Tie point be connected resistance R through 16 Ω resistance with the 9th contact
10With resistance R
9The node F that connects through 1 Ω resistance after to node C, node C is connected with the 10th contact after through 15 Ω resistance, " 0 " contact of measuring disk II is connected with node D through 25 Ω resistance, is the resistance of 10 0.5 Ω on the bracket panel II ' of second step disc; The 3rd step disc is made up of measuring disk III and replacement dish III ', is the resistance of 10 1 Ω on the measuring disk III, is 10 1 Ω resistance on the 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; The positive pole of bracket panel II ' the 10th contact and potential difference meter working power is connected in the A point, 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 195 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 220 Ω resistance, the brush series connection 100k Ω resistance R of measuring disk IV
15Back and setting resistance R
NThe tie point that noble potential one end connects is circuit node E, the 10th contact of replacement dish III ' the 9995 Ω resistance R of connecting
14Back connected node E, 529.392 Ω resistance R
13One end connected node D, other end connected node E; Be used to connect measured " U
X" two terminals, anodal be connected with measuring disk I brush, negative pole is connected with the 10th contact of measuring disk III after passing through double-point double-throw switch K.
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 potential difference meter simple in structure, and volume-diminished has also reduced production cost; On the total circuit partly in potential difference meter internal compensation loop and work loop, there is not switch, so there is not variation influence, when the reset of potential difference meter four measurement disks, the zero potential of potential difference meter is the zero potential that D is ordered, in equalizing network, do not exist working current to flow through lead resistance, so this potential difference meter zero potential is very little, owing on the total circuit partly in potential difference meter internal compensation loop and work loop, do not have switch to switch, so this potential difference meter thermoelectrical potential and variable thermoelectrical potential are also very little.
Description of drawings
Fig. 1 is a principle of the invention circuit.
Embodiment
In Fig. 1, measuring disk II has ten the 10 end to end resistance rings of Ω between 1～9 contact, when measuring disk II puts " 5 ", the brush of measuring disk II is to being that 5 10 Ω resistance are in parallel with 5 10 Ω resistance between the node D, back in parallel resistance maximum, be 25 Ω, so corresponding point directly are connected on 5 contacts and the resistance ring, resistance all connects into 25 Ω and is as the criterion between all the other contacts of measuring disk II and the node D; When measuring disk II put " 4 " or puts " 6 ", the brush of measuring disk II was to being that 4 10 Ω resistance are in parallel with 6 10 Ω resistance between the node D, and back in parallel resistance is 24 Ω, so 4,6 contacts are connected with corresponding point on the resistance ring through 1 Ω resistance; When measuring disk II put " 3 " or puts " 7 ", the brush of measuring disk II was to being that 3 10 Ω resistance are in parallel with 7 10 Ω resistance between the node D, and back in parallel resistance is 21 Ω, so 3,7 contacts are connected with corresponding point on the resistance ring through 4 Ω resistance; When measuring disk II put " 2 " or puts " 8 ", the brush of measuring disk II was to being that 2 10 Ω resistance are in parallel with 8 10 Ω resistance between the node D, and back in parallel resistance is 16 Ω, so 2,8 contacts are connected with corresponding point on the resistance ring through 9 Ω resistance; When measuring disk II set or when putting " 9 ", the brush of measuring disk II is to being that 1 10 Ω resistance is in parallel with 9 10 Ω resistance between the node D, and back in parallel resistance is 9 Ω, so 1,9 contacts are connected with corresponding point on the resistance ring through 16 Ω resistance; When measuring disk II reset, the brush of measuring disk II is to being that 25 Ω resistance connect between the node D, and when measuring disk II puts " 10 ", the brush of measuring disk II is to being that 16 Ω resistance add 9 Ω resistance rings and connect into 25 Ω resistance 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 220 Ω are in parallel with resistance value between the node D, is 110 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 220 Ω are in parallel with resistance value between the node D, is 110 Ω therefore.
When first, second step disc during not reset, the calculating of the resistance value between Node B and the node D except that second step disc is put " 9,10 ", all needs to carry out triangle one 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
9) and resistance R
10The both sides resistance is equivalent to resistance r
1, resistance R
10With resistance R
1The both sides resistance is equivalent to resistance r
1' resistance (R
2+ R
3+ ... + R
9) 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
1+ R
2+ ... + R
10)=80 * 10/100 Ω=8 Ω
r
1’＝R
1×R
10/(R
1+R
2+…+R
10)＝10×10/10×10Ω＝1Ω
r
1”＝(R
2+R
3+…+R
9)×R
1/(R
1+R
2+…+R
10)＝80×10/100Ω＝8Ω
Resistance value equals (211 Ω+r between Node B and the node D
1) * (211 Ω+r
1")/(2 * 219) Ω+r
1'=219 Ω/2+1 Ω=109.5 Ω+1 Ω=110.5 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
9) and resistance R
10The both sides resistance is equivalent to resistance r
2, resistance R
10With resistance (R
1+ R
2) the both sides resistance is equivalent to resistance r
2' resistance (R
3+ R
4+ ... + R
9) 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=7 Ω r
2'=2 Ω r
2"=14 Ω
Resistance value equals (211 Ω+r between Node B and the node D
2) * (195 Ω+9 Ω+r
2")/(2 * 218) Ω+r
2'=218 Ω/2+2 Ω=109 Ω+2 Ω=111 Ω.
In like manner, when second step disc was put " 3 ", resistance value was 111.5 Ω between Node B and the node D,
When second step disc was put " 4 ", resistance value was 112 Ω between Node B and the node D,
When second step disc was put " 5 ", resistance value was 112.5 Ω between Node B and the node D,
……
When second step disc was put " 9 ", resistance value was that (211/2+9) Ω=when 114.5 Ω, second step disc was put " 10 ", resistance value was (210/2+10) Ω=115 Ω between Node B and the node D between Node B and the node D.Because the every stepping of measuring disk II increases by 0.5 Ω, so the every stepping of bracket panel II ' reduces by 0.5 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 110 Ω, and 10 * 0.5 Ω resistance of bracket panel II ' all enter circuit, makes to keep 115 Ω resistance values between node A and the node D.
Electric current is 2mA during the standardization of potential difference meter working current, and 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 ... 9) resistance value and Node B are through 195 Ω resistance R
12To intersection point Q
nResistance value equate, so flow through measuring disk I and 195 Ω resistance R
12Electric current respectively be 1mA; When measuring disk II puts " 9 ", 195 Ω resistance R
12Add 16 Ω resistance and equate to the resistance value of node F with measuring disk I to the resistance value of node F, when measuring disk II puts " 10 ", 195 Ω resistance R
12Add 15 Ω resistance and equate with the resistance value of measuring disk I, so flow through measuring disk I and 195 Ω resistance R to the resistance value of node C
12Electric current also respectively be 1mA.
When not considering measuring disk I, ten the 10 Ω end to end resistance rings of measuring disk II between 1～9 contact, resistance R during measuring disk II set
1To be all 10 Ω resistance in parallel with 9 resistances, flows through resistance R
10Electric current be 1/10mA, the voltage U between node F and the node D
FD=1/10 * 10mV=1mV; Resistance (R when measuring disk II puts " 2 "
1+ R
2) to be all 10 Ω resistance in parallel with 8 resistances, flows through resistance R
10Electric current be 2/10mA, the voltage U between node F and the node D
FD=2/10 * 10mV=2mV; (n=1,2,3 when in like manner, measuring disk II puts " n " ... 9) voltage U between resistance nodes F and the node D
FD=nmV; Measuring disk II puts 10 " time, voltage U on the 9 Ω resistance between node F and the node D
FD=9mV adds 1 Ω resistance R
11Last 1mV, 10mV altogether; When measuring disk I and measuring disk II reset, electric current is without resistance R
10, U
FD=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 10mV voltage between node C, the D, the resistance between 0,1 contact of replacement measuring disk I.
Potential difference meter 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 529.392 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
5÷ 11+5) Ω is 0.11mA in order to make the total current that flows through the 3rd, the 4th step disc, with 529.392 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; Three, during the 4th step disc reset indicating value and the 3rd, the 4th step disc when putting " 10 " indicating value between node D and the node E change in resistance be 5m Ω, to the total resistance of potentiometer circuit the variation of hour 1375 Ω resistances are parts per million (ppm), influence can be ignored equally.
During the 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＝1×10n
1+1×n
2/11×11+0.1×n
3+0.01×n
4 (mV)
＝10n
1+n
2+0.1n
3+0.01n
4 (mV)
Because the electromotive force of standard cell disperses, between 1.0188V～1.0196V, standardized working current is 2mA, therefore sets up resistance R
NGet 509 Ω, add the lockable adjustable resistance R of 0～1 Ω
P3, variation range that can the coverage criteria cell emf.
Resistance between node A and the node D is 115 Ω, and the resistance between node D and the node E is 500 Ω, the setting resistance R of 509 Ω
NWith 0～1 Ω adjustable resistance R
P3Be 510 Ω, add 250 Ω resistance R
0, amount to 1375 Ω, bear 2.75V voltage; Potential difference meter adopts two groups of dry cell power supplies, and electromotive force was about 1.65V when dry cell was new, with old to 1.35V when following, the electric current shakiness, in order to make dry cell under new, former affection condition, can both make the working current of potential difference meter be adjusted to standardization, for this reason, get adjustable resistance R
P1Be 10 * 25 Ω, adjustable resistance R
P2Be 0～27 Ω, dry cell voltage usable range is between 2.75V～3.3V.
The normalized current of potential difference meter is such acquisition: 200mV standard signal voltage is pressed polarity and potential difference meter " U
x" two measure terminal and connect, the total indicating value of each step disc of potential difference meter is identical with the standard signal magnitude of voltage, double-point double-throw switch K throws to the left side, adjusting adjustable resistance R
P1And adjustable resistance R
P2, make galvanometer G nulling; Again double-point double-throw switch K is thrown 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 potential difference meter is with regard to standardization.
Claims (1)
1. portable potentiometer, from the positive pole of potential difference meter 3V working power through by the setting resistance R of the resistance measurement network on four step discs to 509 Ω
NAnd the lockable adjustable resistance R of 0～1 Ω
P3, again to 250 Ω resistance R
0, through the adjustable resistance R of 10 * 25 Ω
P1And 0～27 Ω adjustable resistance R
P2Get back to the negative pole of working power and form potential difference meter work loop; Standard cell E
NAnodal arriving through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts set up resistance R
NAnd lockable adjustable resistance R
P3, process 75K 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, anodal terminal is through behind the resistor network of four measurement disks, again through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts to negative pole terminal composition potential difference meter equalizing network; It is characterized in that first step disc has measuring disk I, it has 0～22 totally 23 gears, except that between 0,1 contact, directly connecting, connect one of 10 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, 0 contact of 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 ', and measuring disk II has 0～10 totally 11 gears, the resistance of 10 10 Ω is arranged, the 1st resistance R above 0～9 gear
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end, resistance R
3The other end welds the 4th resistance R
4One end, resistance R
4The other end welds the 5th resistance R
5One end, resistance R
5The other end welds the 6th resistance R
6One end, resistance R
6The other end welds the 7th resistance R
7One end, resistance R
7The other end welds the 8th resistance R
8One end, resistance R
8The other end welds the 9th resistance R
9One end, the 9th resistance R
9The other end and the 10th resistance R
10The tie point that connects of an end be circuit node F, the 10th resistance R
10The other end and the 1st resistance R
1The other end be connected in 0 contact of measuring disk in 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 16 Ω resistance with the 1st contact
2With resistance R
3Tie point be connected resistance R through 9 Ω resistance with the 2nd contact
3With resistance R
4Tie point be connected resistance R through 4 Ω resistance with the 3rd contact
4With resistance R
5Tie point be connected resistance R through 1 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 through 1 Ω resistance with the 6th contact
7With resistance R
8Tie point be connected resistance R through 4 Ω resistance with the 7th contact
8With resistance R
9Tie point be connected resistance R through 9 Ω resistance with the 8th contact
9With resistance R
10Tie point be connected resistance R through 16 Ω resistance with the 9th contact
10With resistance R
9The node F that connects through 1 Ω resistance after to node C, node C is connected with the 10th contact after through 15 Ω resistance, " 0 " contact of measuring disk II is connected with node D through 25 Ω resistance, is the resistance of 10 0.5 Ω on the bracket panel II ' of second step disc; The 3rd step disc is made up of measuring disk III and replacement dish III ', is the resistance of 10 1 Ω on the measuring disk III, is 10 1 Ω resistance on the 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; The positive pole of bracket panel II ' the 10th contact and potential difference meter working power is connected in the A point, 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 195 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 220 Ω resistance, the brush series connection 100k Ω resistance R of measuring disk IV
15Back and setting resistance R
NThe tie point that noble potential one end connects is circuit node E, the 10th contact of replacement dish III ' the 9995 Ω resistance R of connecting
14Back connected node E, 529.392 Ω resistance R
13One end connected node D, other end connected node E; Be used to connect measured " U
X" two terminals, anodal be connected with measuring disk I brush, negative pole is connected with the 10th contact of measuring disk III after passing through double-point double-throw switch K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710068938A CN101055279B (en) | 2007-05-29 | 2007-05-29 | Portable potentiometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710068938A CN101055279B (en) | 2007-05-29 | 2007-05-29 | Portable potentiometer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101055279A CN101055279A (en) | 2007-10-17 |
| CN101055279B true CN101055279B (en) | 2010-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710068938A Expired - Fee Related CN101055279B (en) | 2007-05-29 | 2007-05-29 | Portable potentiometer |
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|---|---|
| CN (1) | CN101055279B (en) |
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|---|---|---|---|---|
| CN103777049A (en) * | 2011-12-30 | 2014-05-07 | 孙笑声 | Voltage measuring instrument |
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-
2007
- 2007-05-29 CN CN200710068938A patent/CN101055279B/en not_active Expired - Fee Related
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|---|---|---|---|---|
| US5920196A (en) * | 1997-04-10 | 1999-07-06 | Schaffer; Larry | Rapid low voltage testing apparatus |
| EP0903585B1 (en) * | 1997-09-18 | 2002-12-11 | Fluke Corporation | Input ranging circuit for an electronic instrument |
| CN2833614Y (en) * | 2005-09-09 | 2006-11-01 | 骆乃光 | Three range portable potentiometer |
| CN1818672A (en) * | 2005-12-30 | 2006-08-16 | 骆乃光 | DC potential difference meter with four measuring disks |
| CN201053996Y (en) * | 2007-05-29 | 2008-04-30 | 方李 | Portable potentiometer |
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| Title |
|---|
| JP昭63-284474A 1988.11.21 |
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| Publication number | Publication date |
|---|---|
| CN101055279A (en) | 2007-10-17 |
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