CN104111363A - Potentiometer with temperature compensation table - Google Patents
Potentiometer with temperature compensation table Download PDFInfo
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- CN104111363A CN104111363A CN201410363572.6A CN201410363572A CN104111363A CN 104111363 A CN104111363 A CN 104111363A CN 201410363572 A CN201410363572 A CN 201410363572A CN 104111363 A CN104111363 A CN 104111363A
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- dish
- resistance
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- measurement
- step disc
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Abstract
The invention provides a potentiometer with a temperature compensation table. The potentiometer with the temperature compensation table is used for measuring DC voltage. The potentiometer comprises five step panels; the four rear step panels are all composed of measuring panels, and replacement panels that are structured the same as the measuring panels. According to the potentiometer with the temperature compensation table, the measuring panels of the four rear step panels are connected with corresponding contacts on the replacement panels, and thereby,, the influence of the resistance of an internal lead of the potentiometer, switch contact resistance and variation, and thermoelectric potential on the potentiometer can be ignored.
Description
Technical field
The instrument that the present invention relates to DC voltage to measure.
Background technology
The current potential difference meter for there being five step discs, in the connection between five step discs, telophragma generally adopts switching over, so just produces the variation of contact resistance, brings restriction to resolution.In order to overcome this problem, generally adopt large brush with enlarge active surface, and adopt silver-carbon/carbon-copper composite material; Application number 200810121911.4 discloses the new method that has the potential difference meter of five step discs to solve switch contact resistance variation, its five step discs are all coiled by measurement and replacement dish forms, not containing bracket panel, on each measurement dish and replacement dish, there is resistance, measurement dish and replacement dish on its five step discs have formed bridge circuit in circuit, the defect of its maximum is that error is not independent, once it is overproof that certain some indicating value is coiled in measurement, just cannot determine which resistance is overproof causes, this makes troubles to qualification and maintenance.
Summary of the invention
The object of the invention is to design a kind of potential difference meter that has five step discs, it does not adopt bridge circuit, and error can be independent like this, and there is no resistance between rear three step disc contacts, and this can reduce costs, and reduces instrument volume.
Technical scheme of the present invention is taked like this: from range of adjustment, the anodal terminal of the external working power E between 2.2～3V passes through by 22 adjustable resistance R that 4 Ω resistance are in series potential difference meter
p1, by 22 adjustable resistance R that 0.2 Ω resistance is in series
p2, and the adjustable resistance R of range of adjustment between 0～0.22 Ω
p3, through five step discs, to 101.8 Ω set up resistance R
n, then through there being the temperature compensation dish W of 18 × 0.05 Ω resistance in seriess to get back to the external working power E negative pole terminal composition potential difference meter work loop of range of adjustment between 2.2～3V above, from external saturated standard cell E
nanodal terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2set up resistance R to 101.8 Ω
nget back to external saturated standard cell E through the temperature compensation dish W that has 18 × 0.05 Ω resistance in seriess above again
nnegative pole terminal composition potential difference meter standard loop, be used for connecting measured " U
x" two terminals, anodal terminal is after five measurement dishes, then through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2to negative pole terminal composition potential difference meter equalizing network, it is characterized in that the first step disc is to have 0, 1, 2, the 20 measurement dish I of totally 21 gears, weld one of 0.1 Ω resistance between upper every two adjacent contacts of measurement dish I, and the second step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish II with have 0, 1, 2, the 10 replacement dish II ' compositions of totally 11 gears, between upper every two adjacent contacts of measurement dish II and replacement dish II ', weld resistance and be one of the resistance of 0.1 Ω, " 0 " contact of measurement dish II is circuit node A, " 10 " contact of replacement dish II ' is circuit node B, and the 3rd step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish III with have 0, 1, 2, the 10 replacement dish III ' compositions of totally 11 gears, the 4th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish IV with have 0, 1, 2, the 10 replacement dish IV ' compositions of totally 11 gears, the 5th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish V with have 0, 1, 2, the 10 replacement dish V ' compositions of totally 11 gears, each contact in the 3rd step disc on measurement dish III and replacement dish III ', each contact in the 4th step disc on measurement dish IV and replacement dish IV ', each contact in the 5th step disc on measurement dish V and replacement dish V ', be connected the resistance R of 999 Ω for the second Metal Contact ring of step disc measurement dish II and the Metal Contact interannular of replacement dish II ' with the corresponding contact of replacement dish II ' with measurement dish II in the second step disc
1connect the resistance R of 9999 Ω for the 3rd Metal Contact ring of step disc measurement dish III and the Metal Contact interannular of replacement dish III '
2connect the resistance R of 100K Ω for the 4th Metal Contact ring of step disc measurement dish IV and the Metal Contact interannular of replacement dish IV '
3connect the resistance R of 1000K Ω for the 5th Metal Contact ring of step disc measurement dish V and the Metal Contact interannular of replacement dish V '
4connect, when the brush on each step disc measurement dish rotates with the brush on replacement dish, synchronize, " 0 " contact of measurement dish II is that node A connects measurement dish I " 0 " contact, and measurement dish I " 20 " contact is through the resistance R of 6 Ω
8after connected node C, connect again adjustable resistance R
p3cold end, another road of node C is through 12 Ω resistance R
6connect double-point double-throw switch K
1middle K
1-1layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-1layer and K
1-2the normally closed contact of layer connects with wire, and " 10 " contact of replacement dish I ' is that Node B connects double-point double-throw switch K
1middle K
1-1layer × 1 range contact and K
1-2layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-2layer × 0.1 range contact is through 97.2 Ω resistance R
7with K
1-2layer × 1 range contact connects, then sets up resistance R through 101.8 Ω
nabove rear connection, there is the temperature compensation dish W of 18 × 0.05 Ω resistance in seriess, temperature compensation dish W two ends 0.1 Ω resistance R in parallel
9the external working power E negative pole of rear connection potential difference meter terminal, be used for connecting measured " U
x" two measure terminals, anodal terminal is connected with the Metal Contact ring of measurement dish I, negative pole terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2be connected with " 10 " contact of measurement dish II afterwards.
By above technical scheme, between the 3rd, the 4th, the 5th step disc contact, all there is no resistance, and five step disc errors are independent, the error of the identical stepping of rear four dish is consistent, and this brings convenience to debugging and maintenance, also makes potential difference meter simple in structure, volume-diminished, thus production cost reduced; In the time of five measurement dish resets of potential difference meter, the internal wiring combined potential of potential difference meter is A point current potential, some current potentials are " 0 ", so the zero potential of this potential difference meter is very little, it is that in the voltage drop of unit, therefore thermoelectrical potential is to " U that the thermoelectrical potential of rear five several μ V of each branch road of step disc is all connected on to lie prostrate
x" two measure terminals impacts and can ignore.
Brief description of the drawings
Fig. 1 is a kind of schematic circuit of the present invention.
In Fig. 1, the adjustable resistance R of 22 × 4 Ω
p1, represent adjustable resistance R
p1on have the series connection of resistance that 22 resistances are 4 Ω, in like manner, the adjustable resistance R of 22 × 0.2 Ω
p2, represent adjustable resistance R
p2on have the series connection of resistance that 22 resistances are 0.2 Ω, 20 × 0.1 Ω on the first step disc measurement dish I represent that measurement dish I has the resistance series connection that 20 resistances are 0.1 Ω, 10 × 0.1 Ω on the second step disc measurement dish II and replacement dish II ', represent that measurement dish II has the resistance that 10 resistances are 0.1 Ω to connect with on replacement dish II ', in Fig. 1, on step disc, thick black line represents Metal Contact ring, and hollow small circle represents hard contact, and four-headed arrow represents metallic brush.
Embodiment
Embodiment 1, in Fig. 1, when in rear four step discs between node A, Node B, any one step disc rotates, the resistance that electric current flows through measurement dish to be increased equals electric current and flows through the resistance that replacement dish reduces, vice versa, so, what indicating value rear four step discs no matter put, and this step disc resistance value between node A and Node B is constant, and this can ensure rear four step discs no matter put what indicating value, each step disc resistance ratio is substantially constant, and the electric current of each step disc of also ensureing to flow through is substantially constant.
Potential difference meter standard operation current design becomes 10mA, in the time of × 0.1 range, from node C through 6 Ω resistance R
8, five step discs are 108 Ω to Node B resistance, are connected to double-point double-throw switch K
1middle K
1-2layer × when 0.1 range contact, with 12 Ω resistance R
6parallel connection, 108 Ω resistances are 12 Ω resistance R
69 times of resistance, so flow through 12 Ω resistance R
6electric current be 9mA, the electric current that flows through five step discs is 1mA, with 12 Ω resistance R
6the resistance that makes circuit reduce after parallel connection, by the 97.2 Ω resistance R of connecting
7carry out the total resistance of holding circuit constant.
In the time of × 1 range, flowing through between node A and Node B is total working electric current 10mA.Potential difference meter 10mA working current is divided into five tunnels after node A: a road is through measurement dish II, and a road is through measurement dish III, and a road is through measurement dish IV, and a road is through measurement dish V, and Zai Yi road is through 112.4986 Ω resistance R
5, five road electric currents meet at Node B.Except process resistance R
5outside branch road, each branch road resistance ratio between node A, Node B: the 5th step disc: the 4th stepping: the 3rd step disc: the second step disc=1000: 100: 10: 1, so, except flowing through resistance R
5outside branch road, flow through each branch current ratio between node A, Node B and be: the 5th step disc: the 4th stepping: the 3rd step disc: the second step disc=1: 10: 100: 1000, except resistance R
5outside branch road, between node A, Node B, resistance is 1000K Ω/1111, allows the total current that flows through measurement dish V, measurement dish IV, measurement dish III and measurement dish II be 1.111mA, flows through resistance R
5electric current be 8.889mA, 8.889mA × R
5=1000K Ω/1111 × 1.111mA, resistance R
5≈ 112.4986 Ω.Potential difference meter 10mA working current is through resistance R
5shunting, making to flow through measurement dish V electric current is 0.001mA, and measurement dish IV electric current is 0.01mA, and measurement dish III is 0.1mA, and measurement dish II electric current is 1mA; At this moment the each stepping of the first step disc is 1mV, and the each stepping of the second step disc is 0.1mV, and the each stepping of the 3rd step disc is 0.01mV, and the each stepping of the 4th step disc is 0.001mV, and the each stepping of the 5th step disc is 0.0001mV.
When after working current standardization, I measurement dish is thrown n
1, II measurement dish is thrown n
2, III measurement dish is thrown n
3, IV measurement dish is thrown n
4, V measurement dish is thrown n
5, K switch is thrown to the left side, is at this moment positioned at voltage between two terminals of measurement to be:
U
X＝10×0.1n
1+1×0.1n
2+0.1×0.1n
3+0.01×0.1n
4+0.001×0.1n
5(mV)
U
X＝1n
1+0.1n
2+0.01n
3+0.001n
4+0.0001n
5(mV)
U
X＝1000n
1+100n
2+10n
3+1n
4+0.1n
5(μV)
In the time of × 0.1 range, the electric current of five the measurement dishes of flowing through be reduced in the time of × 1 range 1/10, so when after working current standardization, I measurement dish is thrown n
1, II measurement dish is thrown n
2, III measurement dish is thrown n
3, IV measurement dish is thrown n
4, V measurement dish is thrown n
5, K switch is thrown to the left side, is at this moment positioned at voltage between two terminals of measurement to be:
U
X＝1×0.1n
1+0.1×0.1n
2+0.01×0.1n
3+0.001×0.1n
4+0.0001×0.1n
5(mV)
U
X＝100n
1+10n
2+1n
3+0.1n
4+0.01n
5(μV)
In standard loop, the electromotive force of saturated standard cell is 1.0186V in the time of 20 DEG C of room temperatures, 1 DEG C of the every rising of environment temperature, the electromotive force of saturated standard cell reduces approximately 40 μ V, determines by the thermometer of 0.1 DEG C of resolution on saturated standard cell the electromotive force that saturated standard cell is instant.
This potential difference meter flows through temperature compensation dish with 1mA electric current, and on temperature compensation dish, every stepping 0.05 Ω resistance obtains the temperature compensation of every stepping 50 μ V.
Potential difference meter working power will adopt YJ49 type high stability adjustable stabilized voltage supply, adjustable resistance R
p1, adjustable resistance R
p2, adjustable resistance R
p3be used for regulating working current, adjustable resistance R
p3all the resistance value of range of adjustment is greater than adjustable resistance R
p2a step value, adjustable resistance R
p2all the resistance value of range of adjustment is greater than adjustable resistance R
p1a step value, as long as YJ49 type high stability adjustable stabilized voltage supply output voltage is adjusted between 2.2～3V, just can conveniently pass through adjusting adjustable resistance R
p1, adjustable resistance R
p2, adjustable resistance R
p3potential difference meter working current is adjusted to standard state.
Claims (1)
1. have a potential difference meter for a temperature compensation dish, from range of adjustment, the anodal terminal of the external working power E between 2.2～3V passes through by 22 adjustable resistance R that 4 Ω resistance are in series potential difference meter
p1, by 22 adjustable resistance R that 0.2 Ω resistance is in series
p2, and the adjustable resistance R of range of adjustment between 0～0.22 Ω
p3, through five step discs, to 101.8 Ω set up resistance R
n, then through there being the temperature compensation dish W of 18 × 0.05 Ω resistance in seriess to get back to the external working power E negative pole terminal composition potential difference meter work loop of range of adjustment between 2.2～3V above, from external saturated standard cell E
nanodal terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2set up resistance R to 101.8 Ω
nget back to external saturated standard cell E through the temperature compensation dish W that has 18 × 0.05 Ω resistance in seriess above again
nnegative pole terminal composition potential difference meter standard loop, be used for connecting measured " U
x" two terminals, anodal terminal is after five measurement dishes, then through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2to negative pole terminal composition potential difference meter equalizing network, it is characterized in that the first step disc is to have 0, 1, 2, the 20 measurement dish I of totally 21 gears, weld one of 0.1 Ω resistance between upper every two adjacent contacts of measurement dish I, and the second step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish II with have 0, 1, 2, the 10 replacement dish II ' compositions of totally 11 gears, between upper every two adjacent contacts of measurement dish II and replacement dish II ', weld resistance and be one of the resistance of 0.1 Ω, " 0 " contact of measurement dish II is circuit node A, " 10 " contact of replacement dish II ' is circuit node B, and the 3rd step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish III with have 0, 1, 2, the 10 replacement dish III ' compositions of totally 11 gears, the 4th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish IV with have 0, 1, 2, the 10 replacement dish IV ' compositions of totally 11 gears, the 5th step disc is by having 0, 1, 2, 10 totally 11 gears measurement dish V with have 0, 1, 2, the 10 replacement dish V ' compositions of totally 11 gears, each contact in the 3rd step disc on measurement dish III and replacement dish III ', each contact in the 4th step disc on measurement dish IV and replacement dish IV ', each contact in the 5th step disc on measurement dish V and replacement dish V ', be connected the resistance R of 999 Ω for the second Metal Contact ring of step disc measurement dish II and the Metal Contact interannular of replacement dish II ' with the corresponding contact of replacement dish II ' with measurement dish II in the second step disc
1connect the resistance R of 9999 Ω for the 3rd Metal Contact ring of step disc measurement dish III and the Metal Contact interannular of replacement dish III '
2connect the resistance R of 100K Ω for the 4th Metal Contact ring of step disc measurement dish IV and the Metal Contact interannular of replacement dish IV '
3connect the resistance R of 1000K Ω for the 5th Metal Contact ring of step disc measurement dish V and the Metal Contact interannular of replacement dish V '
4connect, when the brush on each step disc measurement dish rotates with the brush on replacement dish, synchronize, " 0 " contact of measurement dish II is that node A connects measurement dish I " 0 " contact, and measurement dish I " 20 " contact is through the resistance R of 6 Ω
8after connected node C, connect again adjustable resistance R
p3cold end, another road of node C is through 12 Ω resistance R
6connect double-point double-throw switch K
1middle K
1-1layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-1layer and K
1-2the normally closed contact of layer connects with wire, and " 10 " contact of replacement dish I ' is that Node B connects double-point double-throw switch K
1middle K
1-1layer × 1 range contact and K
1-2layer × 0.1 range contact, double-point double-throw switch K
1middle K
1-2layer × 0.1 range contact is through 97.2 Ω resistance R
7with K
1-2layer × 1 range contact connects, then sets up resistance R through 101.8 Ω
nabove rear connection, there is the temperature compensation dish W of 18 × 0.05 Ω resistance in seriess, temperature compensation dish W two ends 0.1 Ω resistance R in parallel
9the external working power E negative pole of rear connection potential difference meter terminal, be used for connecting measured " U
x" two measure terminals, anodal terminal is connected with the Metal Contact ring of measurement dish I, negative pole terminal is through being connected to the double-point double-throw switch K of galvanometer G between two normally closed contacts
2be connected with " 10 " contact of measurement dish II afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410363572.6A CN104111363A (en) | 2014-07-24 | 2014-07-24 | Potentiometer with temperature compensation table |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410363572.6A CN104111363A (en) | 2014-07-24 | 2014-07-24 | Potentiometer with temperature compensation table |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104111363A true CN104111363A (en) | 2014-10-22 |
Family
ID=51708227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410363572.6A Pending CN104111363A (en) | 2014-07-24 | 2014-07-24 | Potentiometer with temperature compensation table |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104111363A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53133067A (en) * | 1977-04-26 | 1978-11-20 | Agency Of Ind Science & Technol | Potential difference measuring device |
| EP1447670A1 (en) * | 2003-02-12 | 2004-08-18 | Dialog Semiconductor GmbH | Sensor read out |
| CN1793942A (en) * | 2005-12-27 | 2006-06-28 | 骆乃光 | Direct current potential difference meter having using conversion branch three-range conversion five measuring discs |
| CN101710145A (en) * | 2009-12-14 | 2010-05-19 | 骆小君 | Multi-range voltage measuring device |
| CN103760397A (en) * | 2011-12-30 | 2014-04-30 | 孙笑声 | Two-measuring range voltage measuring instrument |
| CN204044217U (en) * | 2014-07-24 | 2014-12-24 | 骆孝峰 | There is the potential difference meter of a temperature compensation dish |
-
2014
- 2014-07-24 CN CN201410363572.6A patent/CN104111363A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53133067A (en) * | 1977-04-26 | 1978-11-20 | Agency Of Ind Science & Technol | Potential difference measuring device |
| EP1447670A1 (en) * | 2003-02-12 | 2004-08-18 | Dialog Semiconductor GmbH | Sensor read out |
| CN1793942A (en) * | 2005-12-27 | 2006-06-28 | 骆乃光 | Direct current potential difference meter having using conversion branch three-range conversion five measuring discs |
| CN101710145A (en) * | 2009-12-14 | 2010-05-19 | 骆小君 | Multi-range voltage measuring device |
| CN103760397A (en) * | 2011-12-30 | 2014-04-30 | 孙笑声 | Two-measuring range voltage measuring instrument |
| CN204044217U (en) * | 2014-07-24 | 2014-12-24 | 骆孝峰 | There is the potential difference meter of a temperature compensation dish |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141022 |
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| RJ01 | Rejection of invention patent application after publication |