CN104101757B - Voltage measuring apparatus with temperature compensation plate - Google Patents
Voltage measuring apparatus with temperature compensation plate Download PDFInfo
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- CN104101757B CN104101757B CN201410363534.0A CN201410363534A CN104101757B CN 104101757 B CN104101757 B CN 104101757B CN 201410363534 A CN201410363534 A CN 201410363534A CN 104101757 B CN104101757 B CN 104101757B
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- dish
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- replacement
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Abstract
The invention discloses a voltage measuring apparatus with a temperature compensation plate for measuring a direct current voltage. Each of four rear stepping plates of the voltage measuring apparatus with the temperature compensation plate is composed of a measuring plate and a replacing plate which is structurally identical to the measuring plate, and after the corresponding contacts on the measuring plates and the replacing plates of the four rear stepping plates are connected with each other, three stepping plates do not have resistance. By means of the voltage measuring apparatus with the temperature compensation plate, the influence of the lead resistance in the voltage measuring apparatus, the switch contact resistance and variation, and the thermal electromotive force on the voltage measuring apparatus can be neglected.
Description
Technical field
The present invention relates to the instrument that DC voltage is measured.
Background technology
Currently for there being the pressure measuring instrument of five step discs, in the connection between five step discs, telophragma is commonly used to be opened
Close switching, thus produce the variation of contact resistance, bring restriction to resolution.In order to overcome this problem, the big electricity of general employing
Brush is to increase contact area, and uses silver-copper composite；Application number 200810121911.4 has disclosed five step discs
Pressure measuring instrument solve switch contact resistance be deteriorated new method, its five step discs are all made up of measurement dish and replacement dish,
Without bracket panel, each measurement dish and replacement dish having resistance, the measurement dish on its five step discs and replacement dish are at circuit
In constitute bridge circuit, the defect of its maximum is that error is independent, and once measurement dish point indicating value is overproof, just cannot determine
Being which resistance is overproof to cause, this makes troubles with maintenance to identifying.
Summary of the invention
It is an object of the invention to design a kind of pressure measuring instrument having five step discs, it does not use bridge circuit, and such error can
With independence, and not having resistance between rear three step disc contacts, this can reduce cost, reduces instrument volume.
Technical scheme is so taked: pressure measuring instrument from range of accommodation between 10.2～11V external work electricity
Source E positive pole terminal is through the adjustable resistance R being made up of 22 4 Ω resistant seriesP1, be made up of 22 0.2 Ω resistant series
Adjustable resistance RP2, and range of accommodation adjustable resistance R between 0～0.22 ΩP3, through five step discs, adjust to 101.8 Ω
Determine resistance RN, then have the temperature-compensating dish W of 18 × 0.05 Ω series resistances to return to range of accommodation 10.2～11V through above
Between external working power E negative pole terminal composition pressure measuring instrument performance loop；From external saturated standard cell ENPositive pole terminal
The double-point double-throw switch K of galvanometer G it is connected between two normally-closed contacts2Resistance R is set up to 101.8 ΩNHave through above again
The temperature-compensating dish W of 18 × 0.05 Ω series resistances returns to external saturated standard cell ENNegative pole terminal composition pressure measuring instrument standard
Loop；For connecting measured " UX" two terminals, positive pole terminal after five measurement dishes, then through two normally closed touch
The double-point double-throw switch K of galvanometer G it is connected between point2Loop is compensated to negative pole terminal composition pressure measuring instrument；It is characterized in that it
Have 0,1, the temperature-compensating dish W of 2 ... 18 totally 19 gears, weld 0.05 between temperature-compensating dish W each two adjacent contacts
Ω resistance one, temperature-compensating dish W " 0th " contact 0.1 Ω resistance R in parallel with " 18th " two ends, contact9；It separately has five
Step disc, the first step disc be have 0,1, the measurement dish I of 2 ... 20 totally 21 gears, each two phase on measurement dish I
Weld 0.1 Ω resistance one between adjacent contact, the second step disc by having 0,1, the measurement dish II of 2 ... 10 totally 11 gears with
Have 0,1, the replacement dish II ' composition of 2 ... 10 totally 11 gears, the upper each two of measurement dish II and replacement dish II ' is adjacent
Welding the resistance one that resistance is 0.1111 Ω between contact, " 0th " contact of measurement dish II is circuit node A, replacement dish II '
" 10th " contact be circuit node B, the 3rd step disc by having 0,1, the measurement dish III of 2 ... 10 totally 11 gears with
Have 0,1, the replacement dish III ' composition of 2 ... 10 totally 11 gears, the 4th step disc by having 0,1,2 ... 10 altogether
The measurement dish IV of 11 gears with have 0,1, the replacement dish IV ' composition of 2 ... 10 totally 11 gears, the 5th step disc by
Have 0,1, the measurement dish V of 2 ... 10 totally 11 gears with have 0,1, the replacement dish V ' of 2 ... 10 totally 11 gears
Composition, measurement dish IV and replacement dish in each contact on measurement dish III and replacement dish III ', the 4th step disc in the 3rd step disc
Each contact on IV ', the 5th step disc are measured in each contact on measurement dish V and replacement dish V ' and the second step disc
The corresponding contact of dish II and replacement dish II ' connects, and the metal contact ring of the second step disc measurement dish II connects with the metal of replacement dish II '
Touch the interannular resistance R of 999.89 Ω1Connect, the metal contact ring of the 3rd step disc measurement dish III and the metal of replacement dish III '
The contact interannular resistance R of 9999.89 Ω2Connect, the metal contact ring of the 4th step disc measurement dish IV and the gold of replacement dish IV '
Belong to the contact interannular resistance R of 100K Ω3Connect, the metal contact ring of the 5th step disc measurement dish V and the gold of replacement dish V '
Belong to the contact interannular resistance R of 1000K Ω4Connect, when the brush on each step disc measurement dish rotates with the brush on replacement dish
Synchronizing, the i.e. node A in " 0th " contact of measurement dish II connects measurement dish I " 0th " contact, measurement dish I " 20th " contact
Resistance R through 6.91 Ω8Adjustable resistance R is reconnected after connecting node CP3Cold end, another road of node C is through 101
Ω resistance R6Connect double-point double-throw switch K1Middle K1-1Layer × 0.1 range contact, double-point double-throw switch K1Middle K1-1Layer and K1-2
The normally-closed contact of layer wire connects, and the i.e. node B in " 10th " contact of replacement dish II ' connects double-point double-throw switch K1Middle K1-1
Layer × 1 range contact and K1-2Layer × 0.1 range contact, double-point double-throw switch K1Middle K1-2Layer × 0.1 range contact warp
Cross 818.1 Ω resistance R7With K1-2Layer × 1 range contact connection, then set up resistance R through 101.8 ΩNRear connection temperature-compensating
Dish W " 0th " contact temperature compensation dish W " 18th " contact connects pressure measuring instrument external working power E negative pole terminal；With
In connecting measured " UX" two measurement terminals, positive pole terminal is connected with the metal contact ring of measurement dish I, negative pole terminal
The double-point double-throw switch K of galvanometer G it is connected between two normally-closed contacts2" 10th " contact with measurement dish II is connected afterwards.
By above technical scheme, between the three, the four, the 5th step disc contacts, all there is no resistance, and five step disc errors
Independent, the error of the rear four identical steppings of dish is consistent, and this brings convenience to debugging with maintenance, also makes pressure measuring instrument simple in construction,
Volume-diminished, thus reduce production cost；When five measurement dish resets of pressure measuring instrument, the inside of pressure measuring instrument
Circuit combined potential is A point current potential, and some current potentials are " 0 ", so the zero potential of this pressure measuring instrument is the least, five step discs are each
The thermoelectrical potential of individual branch road several μ V is all connected in the voltage drop in units of volt, and therefore thermoelectrical potential is to " UX" two measurements
Terminal impact can be ignored.
Accompanying drawing explanation
Fig. 1 is a kind of schematic circuit of the present invention.
Detailed description of the invention
In FIG, the adjustable resistance R of 22 × 4 ΩP1, represent adjustable resistance RP1On to have 22 resistances be the resistant series of 4 Ω,
In like manner, the adjustable resistance R of 22 × 0.2 ΩP2, represent adjustable resistance RP2On to have 22 resistances be the resistant series of 0.2 Ω, first
20 × 0.1 Ω on step disc measurement dish I represent that measurement dish I has 20 resistances to be the resistant series of 0.1 Ω,
10 × 0.01111 Ω on second step disc measurement dish II and replacement dish II ', represent on measurement dish II and replacement dish II '
Having 10 resistances is the resistant series of 0.01111 Ω.
In FIG, on step disc, heavy black bar represents that metal contact ring, hollow small circle represent hard contact, four-headed arrow table
Show metallic brush.
Embodiment 1, in FIG, when in rear four step discs between node A, node B, any one step disc rotates, electricity
The resistance that stream flows through measurement dish and increases flows through, equal to electric current, the resistance that replacement dish reduces, vice versa, so, rear four step discs
No matter putting what indicating value, this step disc resistance value between node A and node B is constant, and this can guarantee that no matter rear four step discs are put
What indicating value, each step disc resistance ratio is basically unchanged, and also ensures that the electric current flowing through each step disc is basically unchanged.
Pressure measuring instrument standard operating current is designed to 10mA, when × 0.1 range, from node C through 6.91 Ω resistance R8、
Five step discs are 909 Ω to node B resistance, are connected to double-point double-throw switch K1Middle K1-2Layer × 0.1 range contact time,
With 101 Ω resistance R6Parallel connection, 909 Ω resistances are 101 Ω resistance R69 times of resistance, so flowing through 101 Ω resistance R6Electricity
Stream is 9mA, and the electric current flowing through five step discs is 1mA, with 101 Ω resistance R6The resistance that circuit reduces is made, by string after parallel connection
Join 818.1 Ω resistance R7Carry out holding circuit and always hinder constant.
When × 1 range, flow through between node A and node B for total working electric current 10mA.Pressure measuring instrument 10mA works electricity
Flow after node A, be divided into four tunnels: a road measured dish II, a road measured dish III, a road measured dish IV, then
One tunnel measured dish V, four road electric currents meet at node B.Each branch resistance ratio between node A, node B: the 5th stepping
Dish: the 4th stepping: the 3rd step disc: the second step disc=1000: 100: 10: 1, so, flow through node A, node B
Between each branch current ratio be: the 5th step disc: the 4th stepping: the 3rd step disc: the second step disc=1: 10: 100:
1000,
When pressure measuring instrument 10mA electric current all flows through some resistance on measurement dish II, i.e. measurement dish II, measurement dish III, survey
Brush on amount dish IV, measurement dish V is all put after this resistance, and this resistance is connecting measured " UX" two surveys
Magnitude of voltage between amount terminal is 0.1111mV, at measured " UX" two two ends measuring terminal, the second every stepping of step disc
Voltage value added be 1 × 10-1MV, the voltage value added of the 3rd every stepping of step disc is 1 × 10-2MV, the 4th step disc often walks
The voltage value added entered is 1 × 10-3MV, the voltage value added of the 5th every stepping of step disc is 1 × 10-4mV.First step disc is every
Individual stepping is 1mV.When × 0.1 range, the electric current flowing through five step discs is little to 1/10 when × 1 range, so working as
After operating current standardization, the first each stepping of step disc is 1 × 10-1MV, the voltage value added of the second every stepping of step disc is 1
×10-2MV, the voltage value added of the 3rd every stepping of step disc is 1 × 10-3MV, the voltage value added of the 4th every stepping of step disc is
1×10-4MV, the voltage value added of the 5th every stepping of step disc is 1 × 10-5mV。
In standard loop, the electromotive force of saturated standard cell is 1.0186V when room temperature 20 DEG C, and ambient temperature often raises 1 DEG C,
The electromotive force of saturated standard cell reduces about 40 μ V, determines full by the thermometer of on saturated standard cell 0.1 DEG C of resolution
The electromotive force instant with normal cell.Temperature is compensated by this pressure measuring instrument temperature-compensating dish of every stepping 50 μ V.
Pressure measuring instrument working power YJ49 to be used type high stability adjustable stabilized voltage supply, adjustable resistance RP1, adjustable resistance RP2、
Adjustable resistance RP3For regulating operating current, adjustable resistance RP3All the resistance value of range of accommodation is more than adjustable resistance RP2One
Step value, adjustable resistance RP2All the resistance value of range of accommodation is more than adjustable resistance RP1A step value, as long as YJ49 type
High stability adjustable stabilized voltage supply output voltage is adjusted between 10.2～11V, it is possible to convenient by regulation adjustable resistance RP1、
Adjustable resistance RP2, adjustable resistance RP3Pressure measuring instrument operating current is adjusted to standard state.
Claims (1)
1. having a pressure measuring instrument for temperature-compensating dish, pressure measuring instrument is from the range of accommodation external work between 10.2～11V
Make power supply E positive pole terminal through the adjustable resistance R being made up of 22 4 Ω resistant seriesP1, by 22 0.2 Ω resistant series structures
The adjustable resistance R becomeP2, and range of accommodation adjustable resistance R between 0～0.22 ΩP3, through five step discs, to 101.8
Ω sets up resistance RN, then through have above the temperature-compensating dish W of 18 × 0.05 Ω series resistances return to range of accommodation 10.2～
External working power E negative pole terminal composition pressure measuring instrument performance loop between 11V；From external saturated standard cell ENPositive pole
Terminal is connected to the double-point double-throw switch K of galvanometer G between two normally-closed contacts2Resistance R is set up to 101.8 ΩNPass through again
The temperature-compensating dish W having 18 × 0.05 Ω series resistances above returns to external saturated standard cell ENNegative pole terminal composition voltage is surveyed
Amount instrument standard loop；For connecting measured " UX" two terminals, positive pole terminal is after five measurement dishes, then through two
The double-point double-throw switch K of galvanometer G it is connected between individual normally-closed contact2Loop is compensated to negative pole terminal composition pressure measuring instrument；It is special
Levy be it have 0,1, the temperature-compensating dish W of 2 ... 18 totally 19 gears, temperature-compensating dish W each two adjacent contacts
Between weld 0.05 Ω resistance one, temperature-compensating dish W " 0th " contact 0.1 Ω resistance R in parallel with " 18th " two ends, contact9；
In five described step discs, the first step disc be have 0,1, the measurement dish I of 2 ... 20 totally 21 gears, measurement dish I
Weld 0.1 Ω resistance one between upper each two adjacent contacts, the second step disc by having 0,1,2 ... 10 totally 11 gears
Measurement dish II with have 0,1, the replacement dish II ' composition of 2 ... 10 totally 11 gears, measurement dish II and replacement dish II ' is upper every
Welding the resistance one that resistance is 0.1111 Ω between two adjacent contacts, " 0th " contact of measurement dish II is circuit node A, generation
" 10th " contact changing dish II ' is circuit node B, the 3rd step disc by having 0,1, the measurement of 2 ... 10 totally 11 gears
Dish III with have 0,1, the replacement dish III ' composition of 2 ... 10 totally 11 gears, the 4th step disc by having 0,1,2 ...
10 totally 11 gears measurement dish IV with have 0,1, the replacement dish IV ' composition of 2 ... 10 totally 11 gears, the 5th stepping
Dish by having 0,1, the measurement dish V of 2 ... 10 totally 11 gears with have 0,1, the replacement of 2 ... 10 totally 11 gears
Dish V ' composition, each contact on measurement dish III and replacement dish III ' in the 3rd step disc, in the 4th step disc measurement dish IV with
Each contact on replacement dish IV ', each contact on measurement dish V and replacement dish V ' in the 5th step disc, with the second stepping
In dish, the corresponding contact of measurement dish II and replacement dish II ' connects, the metal contact ring of the second step disc measurement dish II and replacement dish II '
Metal contact the interannular resistance R of 999.89 Ω1Connect, the metal contact ring of the 3rd step disc measurement dish III and replacement dish III '
Metal contact the interannular resistance R of 9999.89 Ω2Connect, the metal contact ring of the 4th step disc measurement dish IV and replacement dish IV '
Metal contact the interannular resistance R of 100K Ω3Connect, the metal contact ring of the 5th step disc measurement dish V and replacement dish V '
Metal contact the interannular resistance R of 1000K Ω4Connecting, the brush on each step disc measurement dish turns with the brush on replacement dish
Synchronizing time dynamic, the i.e. node A in " 0th " contact of measurement dish II connects measurement dish I " 0th " contact, measurement dish I " 20th "
Contact is through the resistance R of 6.91 Ω8Adjustable resistance R is reconnected after connecting node CP3Cold end, another road warp of node C
Cross 101 Ω resistance R6Connect double-point double-throw switch K1Middle K1-1Layer × 0.1 range contact, double-point double-throw switch K1Middle K1-1
Layer and K1-2The normally-closed contact of layer wire connects, and the i.e. node B in " 10th " contact of replacement dish II ' connects double-point double-throw switch
K1Middle K1-1Layer × 1 range contact and K1-2Layer × 0.1 range contact, double-point double-throw switch K1Middle K1-2Layer × 0.1
Range contact is through 818.1 Ω resistance R7With K1-2Layer × 1 range contact connection, then set up resistance R through 101.8 ΩNRear company
Jointing temp compensation dish W " 0th " contact temperature compensation dish W " 18th " contact connects external working power E of pressure measuring instrument and bears
Extreme button；For connecting measured " UX" two measurement terminals, positive pole terminal is connected with the metal contact ring of measurement dish I,
Negative pole terminal is connected to the double-point double-throw switch K of galvanometer G between two normally-closed contacts2With measurement dish II " 10th " is touched afterwards
Point connects；Described working power E uses YJ49 type high stability adjustable stabilized voltage supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410363534.0A CN104101757B (en) | 2014-07-24 | 2014-07-24 | Voltage measuring apparatus with temperature compensation plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410363534.0A CN104101757B (en) | 2014-07-24 | 2014-07-24 | Voltage measuring apparatus with temperature compensation plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104101757A CN104101757A (en) | 2014-10-15 |
| CN104101757B true CN104101757B (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410363534.0A Withdrawn - After Issue CN104101757B (en) | 2014-07-24 | 2014-07-24 | Voltage measuring apparatus with temperature compensation plate |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105548649A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | Potentiometer with six stepping discs |
| CN105548647A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | Potentiometer with seven stepping discs |
| CN105548648A (en) * | 2015-12-29 | 2016-05-04 | 富阳精密仪器厂 | DC potentiometer with seven stepping discs |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1447670A1 (en) * | 2003-02-12 | 2004-08-18 | Dialog Semiconductor GmbH | Sensor read out |
| CN1793957A (en) * | 2005-12-28 | 2006-06-28 | 骆乃光 | Bimeasuring range direct current potontial difference meter having four measuring discs using conversion branch |
| CN201576040U (en) * | 2009-12-30 | 2010-09-08 | 方宁妹 | Potential difference meter |
| CN201622298U (en) * | 2009-12-30 | 2010-11-03 | 程军 | Two-range potential difference meter |
| CN202443049U (en) * | 2011-12-30 | 2012-09-19 | 孙笑声 | Voltage measuring instrument with three measuring ranges |
| CN103777051A (en) * | 2011-12-30 | 2014-05-07 | 孙笑声 | Voltage measuring instrument |
| CN204008799U (en) * | 2014-07-24 | 2014-12-10 | 袁乐香 | There is the pressure measuring instrument of temperature compensation dish |
-
2014
- 2014-07-24 CN CN201410363534.0A patent/CN104101757B/en not_active Withdrawn - After Issue
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1447670A1 (en) * | 2003-02-12 | 2004-08-18 | Dialog Semiconductor GmbH | Sensor read out |
| CN1793957A (en) * | 2005-12-28 | 2006-06-28 | 骆乃光 | Bimeasuring range direct current potontial difference meter having four measuring discs using conversion branch |
| CN201576040U (en) * | 2009-12-30 | 2010-09-08 | 方宁妹 | Potential difference meter |
| CN201622298U (en) * | 2009-12-30 | 2010-11-03 | 程军 | Two-range potential difference meter |
| CN202443049U (en) * | 2011-12-30 | 2012-09-19 | 孙笑声 | Voltage measuring instrument with three measuring ranges |
| CN103777051A (en) * | 2011-12-30 | 2014-05-07 | 孙笑声 | Voltage measuring instrument |
| CN204008799U (en) * | 2014-07-24 | 2014-12-10 | 袁乐香 | There is the pressure measuring instrument of temperature compensation dish |
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| Publication number | Publication date |
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| CN104101757A (en) | 2014-10-15 |
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Granted publication date: 20170111 Effective date of abandoning: 20181128 |