CN100575961C - The potential difference meter that three measuring disk are arranged - Google Patents
The potential difference meter that three measuring disk are arranged Download PDFInfo
- Publication number
- CN100575961C CN100575961C CN200710067805A CN200710067805A CN100575961C CN 100575961 C CN100575961 C CN 100575961C CN 200710067805 A CN200710067805 A CN 200710067805A CN 200710067805 A CN200710067805 A CN 200710067805A CN 100575961 C CN100575961 C CN 100575961C
- Authority
- CN
- China
- Prior art keywords
- resistance
- contact
- bracket panel
- measuring disk
- brush
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
A kind ofly be used for the potential difference meter that dc voltage measurement has three measuring disk, its first step disc is made up of measuring disk and bracket panel, second step disc constitutes measuring disk by 11 * 11 Ω ring resistance nets, constitute bracket panel by 10 0.5 Ω resistance, the 3rd dish is two slide wire discs, is connected with lead between two measuring disk and measurement slip, does not switch by switch, there are not variation and thermoelectric potential influence when potential difference meter is measured, and saved the replacement dish of first and second step disc.
Description
Technical field
The present invention relates to instrument that DC voltage is measured.
Background technology
Current for the potential difference meter that three measuring disk are arranged, in the connection between three measuring disk, telophragma generally adopts switch to switch, and so just produces the variation of contact resistance, brings restriction to resolution.In order to overcome this problem, generally adopt big brush with the increase contact area, and adopt silver-carbon/carbon-copper composite material; Patent No. ZL200520101772.0 has announced that the potential difference meter that three measuring disk are arranged solves the 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 contained the number of plies of resistance, thereby increased the volume of instrument, also make switch and apparatus structure become complicated, maintenance is also made troubles.
Summary of the invention
The objective of the invention is to design a kind of potential difference meter that three measuring disk are arranged, telophragma does not switch by switch in the connection of three measuring disk, and first, second step disc cancellation replacement dish.
Technical scheme of the present invention is taked like this: electric current from the positive pole of potential difference meter 1.5V working power through the setting resistance R of the resistance measurement network on two step discs and the two slide wire disc to 509 Ω
NAnd the lockable adjustable resistance R of 0～1 Ω
P2, again to 75 Ω resistance R
0, through 0～125 Ω adjustable resistance R
P1Get 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
P2, 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, form potential difference meter measurement loop through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts to the negative pole terminal again; 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 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 " 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 0.5 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 0.05 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 11 Ω, the 1st resistance R on the measuring disk II
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end, resistance R
3The other end welds the 4th resistance R
4One end, resistance R
4The other end welds the 5th resistance R
5One end, resistance R
5The other end welds the 6th resistance R
6One end, resistance R
6The other end welds the 7th resistance R
7One end, resistance R
7The other end welds the 8th resistance R
8One end, resistance R
8The other end welds the 9th resistance R
9One end, resistance R
9The other end welds the 10th resistance R
10One end, 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 is connected with 0 contact of measuring slip III, 0 contact of measurement slip III is circuit node B, resistance R
1With resistance R
2Tie point be connected resistance R through 20 Ω resistance with the 1st contact
2With resistance R
3Tie point be connected resistance R through 12 Ω resistance with the 2nd contact
3With resistance R
4Tie point be connected resistance R through 6 Ω resistance with the 3rd contact
4With resistance R
5Tie point be connected resistance R through 2 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 2 Ω resistance with the 7th contact
8With resistance R
9Tie point be connected resistance R through 6 Ω resistance with the 8th contact
9With resistance R
10Tie point be connected resistance R through 12 Ω resistance with the 9th contact
10With resistance R
11Tie point be connected resistance R through 20 Ω resistance with the 10th contact
1With resistance R
11The Node B that connects o'clock is connected with 0 contact through 30 Ω resistance, is the resistance of 10 0.5 Ω on the bracket panel II ' of second step disc; Bracket panel II ' the 10th contact is connected with 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 190 Ω resistance " the tie point that is connected of brush; bracket panel I ' other series connection backs, contacts except that 0 contact connect measuring disk I the 22nd contact; measuring disk I the 0th; 1 contact is connected with node A; 0 contact of bracket panel I ' is connected measurement slip III the 10th contact connection setting resistance R after through 220 Ω resistance with Node B
NNoble potential one end; Be used to connect measured " U
X" two measure terminal, anodally be connected with measuring disk I brush, negative pole is connected with auxiliary slip 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, 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, in measuring the loop, do not exist working current to flow through lead resistance, the zero potential of potential difference meter is that B point current potential produces, 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.
Description of drawings
Fig. 1 is a principle of the invention circuit.
Embodiment
In Fig. 1, measuring disk II is 11 the 11 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 11 Ω resistance are in parallel with 6 11 Ω resistance between the Node B, back in parallel resistance is 30 Ω to the maximum, so corresponding point directly are connected on 5,6 contacts and the resistance ring; All be connected to 30 Ω between other contact of measuring disk II and the Node B; When measuring disk II put " 4 " or puts " 7 ", the brush of measuring disk II was to being that 4 11 Ω resistance are in parallel with 7 11 Ω resistance between the Node B, and back in parallel resistance is 28 Ω, so 4,7 contacts are connected with corresponding point on the resistance ring through 2 Ω resistance; When measuring disk II put " 3 " or puts " 8 ", the brush of measuring disk II was to being that 3 11 Ω resistance are in parallel with 8 11 Ω resistance between the Node B, and back in parallel resistance is 24 Ω, so 3,8 contacts are connected with corresponding point on the resistance ring through 6 Ω resistance; When measuring disk II put " 2 " or puts " 9 ", the brush of measuring disk II was to being that 2 11 Ω resistance are in parallel with 9 11 Ω resistance between the Node B, and back in parallel resistance is 18 Ω, so 2,9 contacts are connected with corresponding point on the resistance ring through 12 Ω resistance; When measuring disk II set or when putting " 10 ", the brush of measuring disk II is to being that 1 11 Ω resistance is in parallel with 10 11 Ω resistance between the Node B, and back in parallel resistance is 10 Ω, so 1,10 contacts are connected with corresponding point on the resistance ring through 20 Ω resistance; When measuring disk II reset, the brush of measuring disk II is between the Node B being the connections of 30 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 220 Ω are in parallel with resistance value between the Node B, is 110 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 220 Ω are in parallel with resistance value between the Node B, is 110 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 * 11 * 11/11 * 11 Ω=9 Ω
r
1’＝R
1×R
11/(R
1+R
2+…+R
10+R
11)＝11×11/11×11Ω＝1Ω
r
1”＝(R
2+R
3+…+R
9+R
10)×R
1/(R
1+R
2+…+R
10+R
11)＝9×11×11/11×11Ω＝9Ω
Resistance value equals (210 Ω+r between the brush of bracket panel I ' and the Node B
1) * (190 Ω+20 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 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=8 Ω r
2'=2 Ω r
2"=16 Ω
Resistance value equals (210 Ω+r between the brush of bracket panel II ' and the Node B
2) * (190 Ω+12 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 the brush of bracket panel I ' and the Node B,
When second step disc was put " 4 ", resistance value was 112 Ω between the brush of bracket panel I ' and the Node B,
When second step disc was put " 5 ", resistance value was 112.5 Ω between the brush of bracket panel I ' and the Node B, and when second step disc was put " 10 ", resistance value was 115 Ω between the brush of bracket panel I ' and the Node B.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 brush of bracket panel I ' and the resistance value between the Node B are 110 Ω, and 10 * 0.5 Ω resistance of bracket panel II ' all enter circuit.
Electric current is 2mA during the standardization of potential difference meter working current, and I is to being equivalent to resistance r for bracket panel I ' brush process measuring disk
n, r
n', r
n" intersection point Q
n(n=1,2,3 ... 10) with through 190 Ω resistance R
12To intersection point Q
nResistance equates, so flow through measuring disk I and 190 Ω resistance R
12Electric current respectively be 1mA.
For ten one the 11 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 11 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 * 11mV=1mV; Resistance (R when measuring disk II puts " 2 "
1+ R
2) to be all 11 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 * 11mV=2mV; (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 mV; 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 10mV 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 step disc puts n
3(n
3Represent big lattice indicating value) " U at this moment
x" two measure that voltage is between terminal:
U
x＝1×10n
1+1×n
2/11×11+2×0.05n
3 (mV)
＝10n
1+n
2+0.1n
3 (mV)
The electromotive force of every series-produced standard cell disperses, and 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
P2, variation range that can the coverage criteria cell emf.
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 75 Ω.Get adjustable resistance R
P1Be 0～125 Ω.
Normalized current is to determine like this: 200mV standard signal voltage is pressed polarity and potential difference meter " U
x" two measure terminal and connect, potential difference meter step disc indicating value is identical with the standard signal magnitude of voltage, double-point double-throw switch K throws to the left side, adjusting adjustable resistance R
P1, make galvanometer G nulling; Again double-point double-throw switch K is thrown to the right, regulate adjustable resistance R
P2, make galvanometer G nulling, at this moment adjustable resistance R
P2Locking; When using from now on, potential difference meter is standard according to this.
Claims (1)
1, a kind of potential difference meter that three measuring disk are arranged, electric current from the positive pole of potential difference meter 1.5V working power through the setting resistance R of the resistance measurement network on two step discs and the two slide wire disc to 509 Ω
NAnd the lockable adjustable resistance R of 0～1 Ω
P2, again to 75 Ω resistance R
0, through 0～125 Ω adjustable resistance R
P1Get 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
P2, 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, form potential difference meter measurement loop through the double-point double-throw switch K that is connected to galvanometer G between two normally closed contacts to the negative pole terminal again; 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 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 " 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 0.5 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 0.05 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 11 Ω, the 1st resistance R on the measuring disk II
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end, resistance R
3The other end welds the 4th resistance R
4One end, resistance R
4The other end welds the 5th resistance R
5One end, resistance R
5The other end welds the 6th resistance R
6One end, resistance R
6The other end welds the 7th resistance R
7One end, resistance R
7The other end welds the 8th resistance R
8One end, resistance R
8The other end welds the 9th resistance R
9One end, resistance R
9The other end welds the 10th resistance R
10One end, 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 is connected with 0 contact of measuring slip III, 0 contact of measurement slip III is circuit node B, resistance R
1With resistance R
2Tie point be connected resistance R through 20 Ω resistance with the 1st contact
2With resistance R
3Tie point be connected resistance R through 12 Ω resistance with the 2nd contact
3With resistance R
4Tie point be connected resistance R through 6 Ω resistance with the 3rd contact
4With resistance R
5Tie point be connected resistance R through 2 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 2 Ω resistance with the 7th contact
8With resistance R
9Tie point be connected resistance R through 6 Ω resistance with the 8th contact
9With resistance R
10Tie point be connected resistance R through 12 Ω resistance with the 9th contact
10With resistance R
11Tie point be connected resistance R through 20 Ω resistance with the 10th contact
1With resistance R
11The Node B that connects o'clock is connected with 0 contact through 30 Ω resistance, is the resistance of 10 0.5 Ω on the bracket panel II ' of second step disc; Bracket panel II ' the 10th contact is connected with 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 190 Ω resistance " the tie point that is connected of brush; bracket panel I ' other series connection backs, contacts except that 0 contact connect measuring disk I the 22nd contact; measuring disk I the 0th; 1 contact is connected with node A; 0 contact of bracket panel I ' is connected measurement slip III the 10th contact connection setting resistance R after through 220 Ω resistance with Node B
NNoble potential one end; Be used to connect measured " U
X" two measure terminal, anodally be connected with measuring disk I brush, negative pole is connected with auxiliary slip III ' after passing through double-point double-throw switch K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710067805A CN100575961C (en) | 2007-04-03 | 2007-04-03 | The potential difference meter that three measuring disk are arranged |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710067805A CN100575961C (en) | 2007-04-03 | 2007-04-03 | The potential difference meter that three measuring disk are arranged |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101034109A CN101034109A (en) | 2007-09-12 |
| CN100575961C true CN100575961C (en) | 2009-12-30 |
Family
ID=38730759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710067805A Expired - Fee Related CN100575961C (en) | 2007-04-03 | 2007-04-03 | The potential difference meter that three measuring disk are arranged |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100575961C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710141B (en) * | 2009-12-14 | 2011-04-13 | 骆晓英 | Potential difference meter with three measuring panels |
| CN101710144B (en) * | 2009-12-14 | 2011-07-20 | 骆小君 | Voltage measurement apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3781679A (en) * | 1973-02-05 | 1973-12-25 | T Matsumoto | Logarithmic recording system |
-
2007
- 2007-04-03 CN CN200710067805A patent/CN100575961C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3781679A (en) * | 1973-02-05 | 1973-12-25 | T Matsumoto | Logarithmic recording system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101034109A (en) | 2007-09-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100587498C (en) | Portable two-measurement range potentiometer | |
| CN101034107B (en) | Three measuring ranges DC potentiometer | |
| CN100547409C (en) | Two-measuring range DC potential difference meter | |
| CN100516891C (en) | Two-range DC potentiometer | |
| CN100587499C (en) | Three-range portable potentiometer | |
| CN100529768C (en) | Voltage measuring instrument with minimum stepping 0.1uV | |
| CN100575961C (en) | The potential difference meter that three measuring disk are arranged | |
| CN201035067Y (en) | Three range portable potential difference meter | |
| CN201035069Y (en) | Four-range portable potential difference meter | |
| CN201017005Y (en) | Four-range portable potentiometer | |
| CN201035068Y (en) | Double range potential difference meter | |
| CN201017007Y (en) | Three range DC potential difference meter | |
| CN101063691B (en) | Three range DC potential difference meter | |
| CN100561235C (en) | Two-range potentiometer | |
| CN101059535B (en) | Two-range portable potentiometer | |
| CN201017006Y (en) | Portable potentiometer | |
| CN100445755C (en) | DC four-measurement range potential difference meter | |
| CN100587500C (en) | Potentiometer with four measuring dish | |
| CN201017003Y (en) | Two-range direct current potentiometer | |
| CN201035070Y (en) | Potential difference meter with three measurement disks | |
| CN101055279B (en) | Portable potentiometer | |
| CN101089633B (en) | Voltage measuring instrument without variation | |
| CN201053989Y (en) | Four-range DC potentiometer | |
| CN201053996Y (en) | Portable potentiometer | |
| CN201053991Y (en) | Four-range potentiometer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091230 Termination date: 20110403 |