CN101710144B - Voltage measurement apparatus - Google Patents
Voltage measurement apparatus Download PDFInfo
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- CN101710144B CN101710144B CN2009101554282A CN200910155428A CN101710144B CN 101710144 B CN101710144 B CN 101710144B CN 2009101554282 A CN2009101554282 A CN 2009101554282A CN 200910155428 A CN200910155428 A CN 200910155428A CN 101710144 B CN101710144 B CN 101710144B
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Abstract
The invention relates to a three-range voltage measurement apparatus which is used for measuring direct current voltage and is provided with three measuring dials. A first stepping disk comprises a 22*10 Omega measurement dial, a second stepping disk comprises a measurement dial consisting of a 11*11Omega circular resistor net and an auxiliary disk consisting of 10 0.5 Omega resistors, a third stepping disk is a double slide wire disk, wherein the two measurement dials are connected with a measurement slide wire through a lead wire. The invention enables the voltage measurement apparatus not to have deviation and thermo electrical potential when in measurement without switching by a switch, and omits two auxiliary disks of the first stepping disk.
Description
Technical field
The present invention relates to instrument that DC voltage is measured.
Background technology
For the pressure measuring instrument that three measuring disk are arranged, telophragma generally adopts switch to switch, and so just produces the variation of contact resistance, brings restriction to resolution a few days ago.In order to overcome this problem, generally adopt big brush with the increase contact area, and adopt silver-carbon/carbon-copper composite material; The patent No. 200720107590.3,200720107582.9 discloses has three three-range pressure measuring instruments of measuring disk to solve the variation new method of switch contact resistance, its first step disc is made up of a measuring disk and two bracket panels, two measuring disk connect the back and are connected between two measurement terminals with slide wire disc, brush on the step disc switch is got rid of outside the measurement loop, do not exist switch to switch between the resistance on three measuring disk, just do not produce variation yet; Because first step disc has three layers, make switch and apparatus structure become complicated, increased the height of instrument simultaneously.
Summary of the invention
The objective of the invention is to design a kind of three range pressure measuring instruments, telophragma does not switch by switch in the connection of three measuring disk, and two bracket panels of first step disc cancellation.
Technical scheme of the present invention is taked like this:
Electric current from the positive pole of pressure measuring instrument 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 485 Ω
NAnd the lockable adjustable resistance R of 0～1 Ω
P2, again to 66 Ω resistance R
0, through 0～120 Ω adjustable resistance R
P1Get back to the negative pole of working power and form pressure measuring instrument 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
P2, process 100K Ω current-limiting resistance R is to standard cell E again
NNegative pole is formed the pressure measuring instrument standard loop; Pressure measuring instrument is used to connect measured " U
X" two terminals, behind the resistance measurement network of anodal terminal through the two slide wire discs of two measuring disk and, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Form the pressure measuring instrument equalizing network to the negative pole terminal; It is characterized in that first step disc has only measuring disk I, it has 0,1,2 ... 22 totally 23 gears, connect one of 10 Ω resistance between each grade contact, 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, the resistance that 11 11 Ω are arranged above, the 1st resistance R
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end, resistance R
3The other end welds the 4th resistance R
4One end, resistance R
4The other end welds the 5th resistance R
5One end, resistance R
5The other end welds the 6th resistance R
6One end, resistance R
6The other end welds the 7th resistance R
7One end, resistance R
7The other end welds the 8th resistance R
8One end, resistance R
8The other end welds the 9th resistance R
9One end, resistance R
9The other end welds the 10th resistance R
10One end, resistance R
10The other end welds the 11st resistance R
11One end, the 11st resistance R
11The other end and the 1st resistance R
1The other end connect 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 point that connects is a Node B, and Node B is connected with the 0th contact through 30 Ω resistance, is the resistance of 10 0.5 Ω on the bracket panel II ' of second step disc, passes through 200 Ω resistance R between the brush of the second step disc measuring disk II and the brush of bracket panel II '
12Connect, the 3rd dish is two slide wire discs, two slip thickness materials are identical, resistance all is 10 Ω, and wherein one is measurement slip III, and another root is auxiliary slip III ', the index dial of two slide wire discs divides 10 big lattice, the resistance of every big lattice correspondence is 1 Ω, and every big lattice divide 10 little lattice, and the brush on two slide wire resistances is with a slice metallic brush sheet; Bracket panel II ' the 10th contact and 2300 Ω resistance R
13End point in parallel be node C, the brush of bracket panel II ' connects measuring disk I the 22nd contact and connects the resistance R in the measuring disk II
10With resistance R
11The point that connects is circuit node A, the 0th contact connecting circuit node A of measuring disk I, 2300 Ω resistance R
13The other end connect to measure top " 0 " point of slip III, the end " 10 " of measuring slip III is o'clock through 90 Ω resistance R
14Back connecting circuit Node B; Node C is through 19/7 Ω resistance R
15Back and 13 Ω range transfer resistance R
16One end is connected in parallel on node D, and node D connects the positive pole of pressure measuring instrument working power, range transfer resistance R
16The other end connects range selector K
1-1* 0.1 and * 1 range contact, Node B and range selector K
1-2* 1 range contact and range selector K
1-1* 10 range contacts connect 105.3 Ω auxiliary resistance R
17An end and range selector K
1-3* 10 range contacts connect the other end and range selector K
1-3* 1 range contact connects 1170 Ω range transfer resistance R
18One end and range selector K
1-2* 1 range contact connects the other end and range selector K
1-2* 0.1 range contact connects 104.13 Ω auxiliary resistance R
17An end and range selector K
1-3* 10 range contacts connect the other end and range selector K
1-3* 0.1 range contact connects three cuttves, three throw switch K
1Three layers: range selector K
1-1, range selector K
1-2And range selector K
1-3Three normally closed contacts connect range selector K with lead
1-3* 10 range contacts connect the setting resistance R
NHot end, pressure measuring instrument connects measured " U
X" two terminals, anodal terminal is connected with measuring disk I brush, the negative pole terminal is through double-point double-throw switch K
2The back is connected with auxiliary slip III '.
By above technical scheme, first step disc has saved two bracket panels, makes potential difference meter simple in structure, volume-diminished, also reduced production cost, in equalizing network, do not passed through switch on the circuit of three measuring disk connections simultaneously, so do not have variation and thermoelectric potential influence; The brush of first step disc and two slide wire discs switches and causes that change in resistance does not influence measurement numerical value, only influences the galvanometer damping, and compares brush with the resistance variations of whole equalizing network and switch and cause that change in resistance can ignore.
Description of drawings
Fig. 1 is a principle of the invention circuit.
In Fig. 1, the measuring disk I of 22 * 10 Ω, expression measuring disk I is made up of the resistance of 22 10 Ω; In like manner, the bracket panel II ' of 10 * 0.5 Ω, expression bracket panel II ' is made up of the resistance of 10 0.5 Ω, and resistance R in the resistance ring network of expression measuring disk II is arranged in the resistance ring network of measuring disk II " 10 * 11 Ω "
1～resistance R
10Ten resistances all are 11 Ω.
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, other contact of measuring disk II all is connected to 30 Ω to the resistance value between the Node B and is as the criterion, and corresponding point directly are connected on the 5th, 6 contacts and the resistance ring; When measuring disk II put " 4 " or puts " 7 ", the brush of measuring disk II was to being that 4 11 Ω resistance are in parallel with 7 11 Ω resistance between the Node B, and back in parallel resistance is 28 Ω, so the 4th, 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 the 3rd, 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 the 2nd, 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 the 1st, 10 contacts are connected with corresponding point on the resistance ring through 20 Ω resistance; When measuring disk II reset, the 0th contact of measuring disk II is between the Node B being the connections of 30 Ω resistance.
The brush of the brush of the measuring disk II of second step disc and bracket panel II ' is synchronous, and during the second step disc reset, the brush of bracket panel II ' is that two resistance that are both 230 Ω are in parallel with resistance value between the Node B, is 115 Ω therefore.
During the second step disc set, the brush of bracket panel II ' need carry out triangle-star conversion to the calculating of resistance value between the Node B, establishes 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/(11×11)Ω＝1Ω
r
1”＝(R
2+R
3+…+R
9+R
10)×R
1/(R
1+R
2+…+R
10+R
11)＝9×11×11/(11×11)Ω＝9Ω
Resistance value equals (220 Ω+r between the brush of bracket panel II ' and the Node B
1) * (200 Ω+20 Ω+r
1")/
(2×229)Ω+r
1’＝229Ω/2+1Ω＝114.5Ω+1Ω＝115.5Ω
When second step disc was put " 2 ", the brush of bracket panel II ' was to the calculating of resistance value between 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 (220 Ω+r between the brush of bracket panel II ' and the Node B
2) * (200 Ω+12 Ω+r
2")/
(2×228)Ω+r
2’＝228Ω/2+2Ω＝114Ω+2Ω＝116Ω。
In like manner, when second step disc was put " 3 ", the brush of bracket panel II ' was 116.5 Ω to resistance value between the Node B,
When second step disc was put " 4 ", the brush of bracket panel II ' was 117 Ω to resistance value between the Node B,
When second step disc was put " 5 ", the brush of bracket panel II ' was 117.5 Ω to resistance value between the Node B,
……
When second step disc was put " 10 ", the brush of bracket panel II ' was 120 Ω to resistance value between the Node B.
Increase by 0.5 Ω because measuring disk II is connected the every stepping in back with measuring disk I, so the every stepping of bracket panel II ' reduces by 0.5 Ω, it is constant that circuit is always hindered.
Node C is 120 Ω through two step discs to the resistance of Node B, node C process slide wire disc is 2400 Ω to the resistance of Node B, is 2.1mA when pressure measuring instrument is made current standard, when * 10 ranges, electric current is 2mA on the 120 Ω resistance, and electric current is 0.1mA on the 2400 Ω resistance; According to triangle-star conversion, I is to equivalent resistance r for bracket panel II ' brush process measuring disk
n, r
n', r
n" intersection point Q
n(n=1,2,3 ... 9) resistance and bracket panel II ' brush are through 200 Ω resistance R
12To intersection point Q
nResistance equate, so flow through measuring disk I and 200 Ω resistance R
12Electric current respectively be 1mA; When measuring disk II puts " 10 ", bracket panel II ' brush through measuring disk I to the resistance of node A and bracket panel II ' brush through 200 Ω resistance R
12Resistance to node A all equals 220 Ω, so flow through measuring disk I and 200 Ω resistance R
12Electric current also 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; When in like manner, measuring disk II puts " n " (n=1,2,3 ... 10) voltage U between resistance nodes A and the Node B
AB=n mV; During measuring disk II reset, electric current is without resistance R
11, U
AB=0mV.Measuring disk I, measuring disk II, measure slip III all during reset, U
ABOn 10mV voltage equal to measure 0 voltage of order of slip III to B, so measure and the node A equipotential of slip III at 0.
During the working current standardization, first step disc is put n
1, second step disc puts n
2, the 3rd dish puts n
3(n
3Represent big lattice indicating value) " U at this moment
x" two measure that voltage is between terminal:
U
x＝1×10n
1+1×10+n
2/11×11-0.1×90-0.1×1×(10-n
3)(mV)
＝10n
1+10+n
2-9-1+0.1n
3(mV)
＝10n
1+n
2+0.1n
3(mV)
During * 1 range, the node D 19/7 Ω resistance R of having connected
15Process node C is 117 Ω and its parallel resistor R to the resistance sum of Node B
16Be 13 Ω, 117 Ω are 9 times of 13 Ω, and therefore, 1/10 working current is that the 0.2mA electric current flows through two step discs to Node B, and it is 0.01mA that electric current flows through the electric current of measuring slip III, and the resistance value that reduces after the parallel connection is advanced 105.3 Ω auxiliary resistance R by series connection
17Come the total resistance of holding circuit constant.When first step disc is put n
1, second step disc puts n
2, the 3rd dish puts n
3(n
3Represent big lattice indicating value) " U at this moment
x" two measure that voltage is between terminal:
U
x＝n
1+0.1n
2+0.01n
3 (mV)
During * 0.1 range, the node D resistance R of having connected
15Through node C to Node B, the 1170 Ω resistance R of having connected again
18Sum is 1287 Ω and its parallel resistor R
16Be 13 Ω, 1287 Ω are 99 times of 13 Ω, and therefore, 1/100 working current is that the 0.02mA electric current flows through two step discs to Node B, it is 0.001mA that electric current flows through the electric current of measuring slip III, and the resistance value that reduces after the parallel connection is advanced 104.13 Ω auxiliary resistance R by series connection
19Come the total resistance of holding circuit constant.When first step disc is put n
1, second step disc puts n
2, the 3rd dish puts n
3(n
3Represent big lattice indicating value) " U at this moment
x" two measure that voltage is between terminal:
U
x＝0.1n
1+0.01n
2+0.001n
3?(mV)
The 3rd dish n
31 μ V be 1 big scale value, every little lattice are 0.1 μ V.
The electromotive force of every series-produced standard cell disperses, and between 1.0188V～1.0196V, standardized working current is 2.1mA, therefore sets up resistance R
NGet 485 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 pressure measuring instrument be adjusted to standardization in order to make dry cell under new, former affection condition, for this reason resistance R with old
0Get 66 Ω.Get adjustable resistance R
P1Be 0～120 Ω.
Normalized current is to determine like this: 200mV standard signal voltage is pressed polarity and pressure measuring instrument " U
x" two measure terminal and connect, it is identical with the standard signal magnitude of voltage that pressure measuring instrument respectively coils total indicating value, double-point double-throw switch K
2Throw to the left side, regulate adjustable resistance R
P1, make galvanometer G nulling; Again with double-point double-throw switch K
2Throw to the right, regulate adjustable resistance P
R2, make galvanometer G nulling, at this moment adjustable resistance R
P2Locking; When using from now on, pressure measuring instrument is standard according to this.
Claims (1)
1. three range pressure measuring instruments that three measuring disk are arranged, electric current from the positive pole of pressure measuring instrument 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 485 Ω
NAnd the lockable adjustable resistance R of 0～1 Ω
P2, again to 66 Ω resistance R
0, through 0～120 Ω adjustable resistance R
P1Get back to the negative pole of working power and form pressure measuring instrument 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
P2, process 100K Ω current-limiting resistance R is to standard cell E again
NNegative pole is formed the pressure measuring instrument standard loop; Pressure measuring instrument is used to connect measured " U
X" two terminals, behind the resistance measurement network of anodal terminal through the two slide wire discs of two measuring disk and, again through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2Form the pressure measuring instrument equalizing network to the negative pole terminal; It is characterized in that first step disc has only measuring disk I, it has 0,1,2 ... 22 totally 23 gears, connect one of 10 Ω resistance between each grade contact, 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, the resistance that 11 11 Ω are arranged above, the 1st resistance R
1One end welds the 2nd resistance R
2One end, resistance R
2The other end welds the 3rd resistance R
3One end, resistance R
3The other end welds the 4th resistance R
4One end, resistance R
4The other end welds the 5th resistance R
5One end, resistance R
5The other end welds the 6th resistance R
6One end, resistance R
6The other end welds the 7th resistance R
7One end, resistance R
7The other end welds the 8th resistance R
8One end, resistance R
8The other end welds the 9th resistance R
9One end, resistance R
9The other end welds the 10th resistance R
10One end, resistance R
10The other end welds the 11st resistance R
11One end, the 11st resistance R
11The other end and the 1st resistance R
1The other end connect 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 point that connects is a Node B, and Node B is connected with the 0th contact through 30 Ω resistance, is the resistance of 10 0.5 Ω on the bracket panel II ' of second step disc, passes through 200 Ω resistance R between the brush of the second step disc measuring disk II and the brush of bracket panel II '
12Connect, the 3rd dish is two slide wire discs, two slip thickness materials are identical, resistance all is 10 Ω, and wherein one is measurement slip III, and another root is auxiliary slip III ', the index dial of two slide wire discs divides 10 big lattice, the resistance of every big lattice correspondence is 1 Ω, and every big lattice divide 10 little lattice, and the brush on two slide wire resistances is with a slice metallic brush sheet; Bracket panel II ' the 10th contact and 2300 Ω resistance R
13End point in parallel be node C, the brush of bracket panel II ' connects measuring disk I the 22nd contact and connects the resistance R in the measuring disk II
10With resistance R
11The point that connects is circuit node A, the 0th contact connecting circuit node A of measuring disk I, 2300 Ω resistance R
13The other end connect to measure top " 0 " point of slip III, the end " 10 " of measuring slip III is o'clock through 90 Ω resistance R
14Back connecting circuit Node B; Node C is through 19/7 Ω resistance R
15Back and 13 Ω range transfer resistance R
16One end is connected in parallel on node D, and node D connects the positive pole of pressure measuring instrument working power, range transfer resistance R
16The other end connects range selector K
1-1* 0.1 and * 1 range contact, Node B and range selector K
1-2* 1 range contact and range selector K
1-1* 10 range contacts connect 105.3 Ω auxiliary resistance R
17An end and range selector K
1-3* 10 range contacts connect the other end and range selector K
1-3* 1 range contact connects 1170 Ω range transfer resistance R
18One end and range selector K
1-2* 1 range contact connects the other end and range selector K
1-2* 0.1 range contact connects 104.13 Ω auxiliary resistance R
17An end and range selector K
1-3* 10 range contacts connect the other end and range selector K
1-3* 0.1 range contact connects three cuttves, three throw switch K
1Three layers: range selector K
1-1, range selector K
1-2And range selector K
1-3Three normally closed contacts connect range selector K with lead
1-3* 10 range contacts connect the setting resistance R
NHot end, pressure measuring instrument connects measured " U
X" two terminals, anodal terminal is connected with measuring disk I brush, the negative pole terminal is through double-point double-throw switch K
2The back is connected with auxiliary slip III '.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101554282A CN101710144B (en) | 2009-12-14 | 2009-12-14 | Voltage measurement apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101554282A CN101710144B (en) | 2009-12-14 | 2009-12-14 | Voltage measurement apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101710144A CN101710144A (en) | 2010-05-19 |
| CN101710144B true CN101710144B (en) | 2011-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101554282A Expired - Fee Related CN101710144B (en) | 2009-12-14 | 2009-12-14 | Voltage measurement apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103777051A (en) * | 2011-12-30 | 2014-05-07 | 孙笑声 | Voltage measuring instrument |
| CN103760397A (en) * | 2011-12-30 | 2014-04-30 | 孙笑声 | Two-measuring range voltage measuring instrument |
| CN103760398A (en) * | 2011-12-30 | 2014-04-30 | 孙笑声 | 0.1 micro V-resolution voltage measuring instrument |
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