CN106291042A - Use the potential difference meter of five step discs - Google Patents
Use the potential difference meter of five step discs Download PDFInfo
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- CN106291042A CN106291042A CN201610707784.0A CN201610707784A CN106291042A CN 106291042 A CN106291042 A CN 106291042A CN 201610707784 A CN201610707784 A CN 201610707784A CN 106291042 A CN106291042 A CN 106291042A
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- dish
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
- G01R17/20—AC or DC potentiometric measuring arrangements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
A kind of for DC voltage measurement, the potential difference meter of five step discs of employing, its each step disc is made up of with replacement dish measurement dish, five measurement dish wires connect, make to there is not contact resistance during step disc switch switching to be deteriorated, thermoelectrical potential nor affects on potential difference meter measurement result, it has two amount limits, and the measurement upper limit is 1V, and minimum resolution is 1 μ V.
Description
Technical field
The present invention relates to the instrument that DC voltage is measured.
Background technology
The impact of potential difference meter variation and thermoelectrical potential in order to solve contact resistance, the big brush of general employing is to increase contact
Area, and use silver-copper composite, which increases switch and also increase instrument volume, add instrument cost, use electricity
The method of stream superposition is only used for the resistance of each stepping and uses small resistor, and typically all 0.01 Ω, if each stepping is electric
The resistance one of resistance is big, and the ratio of electric current will be overproof, owing to the resistance of step disc resistance is little, the voltage that it can be measured the most also than
Relatively low.
Summary of the invention
It is an object of the invention to design a kind of potential difference meter having five step discs, it overcomes variation and the heat of contact resistance
The impact of electromotive force, it is not required that big switch, this can reduce cost, reduce instrument volume, and can measure 1V, and set
Having two amount limits, minimum resolution is 1 μ V.
Technical scheme is so taked: it has range of accommodation adjustable resistance R between 0～100 ΩP1, regulation
Scope adjustable resistance R between 0～1000 ΩP2, range of accommodation lockable adjustable resistance R between 0～1 ΩP3, regulation
Scope is lockable adjustable resistance R between 0～10 ΩP4, have two double-point double-throw switch, have five step discs, each stepping
By being respectively arranged with 0,1, the measurement dish of 2 ... 10 totally 11 gears and replacement dish composition, the measurement dish of each step disc and replacement on dish
Welding the identical resistance one of resistance on dish between two adjacent gear positions contacts, measurement dish and replacement dish are Tong Bu when rotating, measurement
Dish often increases a resistance, and replacement dish just reduces by a resistance, and the total resistance of holding circuit is constant；It is characterized in that: the first stepping
Dish is by being respectively arranged with 0,1, the measurement dish I of 2 ... 10 totally 11 gears and replacement dish I ' composition, each two on measurement dish and replacement dish
Welding 100 Ω resistance one between adjacent gear positions contact, the metal contact ring of the metal contact ring of measurement dish I and replacement dish I ' is with leading
Line connects, and the second step disc is by being respectively arranged with 0,1, the measurement dish II of 2 ... 10 totally 11 gears and replacement dish II ' composition, measurement dish
And on replacement dish, between each two adjacent gear positions contact, weld 10 Ω resistance one, the metal contact ring of measurement dish II and replacement dish
The metal contact ring of II ' passes through 1100 Ω resistance R1Connect, the 3rd step disc by being respectively arranged with 0,1,2 ... 10 totally 11 gears
Measurement dish III and replacement dish III ' composition, measurement dish and replacement dish weld between each two adjacent gear positions contact 1 Ω resistance one
Only, the metal contact ring of measurement dish III and the metal contact ring of replacement dish III ' are by 94 Ω resistance R2Connect, the 4th step disc
By being respectively arranged with 0,1, the measurement dish IV of 2 ... 10 totally 11 gears and replacement dish IV ' composition, each two on measurement dish and replacement dish
Welding 1 Ω resistance one between adjacent gear positions contact, the metal contact ring of measurement dish IV passes through with the metal contact ring of replacement dish IV '
900 Ω resistance R3Connecting, the 5th step disc is by being respectively arranged with 0,1, the measurement dish V of 2 ... 10 totally 11 gears and replacement dish V ' group
Become, measurement dish and replacement dish weld between each two adjacent gear positions contact 0.1 Ω resistance one, the metal contact ring of measurement dish V
889 Ω resistance R are passed through with the metal contact ring of replacement dish V '4Connect；Connect node A after current from working power E positive pole to be divided into
Two-way a: upwards road connects replacement dish II ' the 10th contact on the second step disc, replacement dish II ' the 0th contact connects the first step disc
Upper replacement dish I ' the 10th contact, on the first step disc, the 0th contact of measurement dish I connects on the second step disc measurement dish II the 10th and touches
Point, with double-point double-throw switch K after measurement dish II the 0th contact connection node B1K1-1Layer normally-closed contact connects, double-point double-throw switch
K1Put × 1 amount in limited time, electric current is through 318 Ω resistance R8, range of accommodation lockable adjustable resistance R between 0～1 ΩP3To double
Double-pole double throw switch K1K1-2Layer normally-closed contact, then through range of accommodation adjustable resistance R between 0～100 ΩP1To work electricity
Source E negative pole；Double-point double-throw switch K1Put × 0.1 amount in limited time, electric current is through 3180 Ω resistance R9, range of accommodation is between 0～10 Ω
Lockable adjustable resistance RP4To double-point double-throw switch K1K1-2Layer normally-closed contact, then through range of accommodation 0～1000 Ω it
Between adjustable resistance RP2, adjustable resistance RP1To working power E negative pole；Lead up to downwards 11081/12 Ω resistance R5Connect the 3rd
0th contact of replacement dish III ' on step disc, the 10th contact of replacement dish III ' connects the of replacement dish IV ' on the 4th step disc
0 contact, the 10th contact of replacement dish IV ' connects the 0th contact of replacement dish V ', measurement dish on the 5th step disc on the 5th step disc
10th contact of V connects the 0th contact of measurement dish IV on the 4th step disc, and the 10th contact of measurement dish IV connects the 3rd step disc
0th contact of upper measurement dish III, the 10th contact of measurement dish III is through 859/12 Ω resistance R11Connect node B, potential difference meter
For connecting measured " UX" two terminals, positive pole terminal connects measurement dish I the 10th contact, and negative pole terminal is normally closed through two
The double-point double-throw switch K of galvanometer G it is connected between contact2It is connected with measurement dish V the 0th contact afterwards, potential difference meter internal attachment standard electricity
Pond ENNegative pole is connected to the double-point double-throw switch K of galvanometer G between two normally-closed contacts2Connect 100K Ω resistance R7Afterwards with double
Double-pole double throw switch K1K1-2Layer normally-closed contact connects, internal attachment standard battery ENPositive pole connects double-point double-throw switch K1K1-1Layer is often
Closed contact.
By above technical scheme, with " UX" two measurement terminals connect five measurement dishes on resistance, in stepping
During dish switching, the resistance welded together is to produce change, and during step disc switching, switch contact resistance is deteriorated 0.1
～between 1m Ω, it only affects the ratio of electric current distribution, owing to it is connected in big resistance, such as the switch contact of the first step disc
Resistance is deteriorated and is connected in 1100 Ω circuit, and therefore the impact on current distributing can be ignored, the heat of switch during step disc switching
Electromotive force is owing to occurring the most in pairs, and size is identical, in opposite direction, can offset, and five step disc several μ of each branch road
The thermoelectrical potential of V is all directly or indirectly connected with both ends of power, and in the voltage drop in units of volt, the thermoelectrical potential of several μ V is to electricity
The impact of flow point stream can also be ignored, and therefore, uses technical scheme, and during the switching of potential difference meter step disc, switch contact resistance is deteriorated
And thermoelectrical potential is to " UX" two measurement terminals do not affect.
Accompanying drawing explanation
Fig. 1 is the schematic circuit of the present invention.
Detailed description of the invention
Embodiment 1, in FIG, 10 × 100 Ω on the first step disc measurement dish I and replacement dish I ', represent measurement dish I
And have 10 resistances to be the resistant series of 100 Ω on replacement dish I ', on step disc, heavy black bar represents metal contact ring, hollow
Small circle represents that hard contact, four-headed arrow represent metallic brush；When step disc rotates, the resistance that measurement dish I increases is equal to generation
Change the resistance that dish I ' reduces, constant with resistance total in holding circuit；Other four step discs are in like manner.
Limiting in × 1 amount, potential difference meter standard operating current is designed to 3.2mA, the electric current of lower section between node A and node B
Being designed to 1.2mA, between node A with node B, the current design of top becomes 2mA.
It is 1100 Ω resistance R between the second step disc two brush1The second step disc and the first step disc is flowed through with electric current
1100 Ω resistor coupled in parallel, therefore flow through the first step disc and flow through 1100 Ω resistance R1Electric current be all 1mA, node A and node B
Resistance above between is 1100/2 Ω+100 Ω=650 Ω, and therefore, between node A and node B, the resistance of lower section is:
650 Ω × 2mA ÷ 1.2mA=3250/3 Ω
Because resistance R3It is 900 Ω, between the 4th step disc two brush, flows through the 5th step disc, through 889 Ω resistance R4's
Resistance is also 900 Ω, disregards the 5th step disc and is superimposed upon electric current on the 4th dish, and the electric current that the four, the 5th step discs flow through is all
0.1mA, between the 4th step disc two brush, resistance is 450 Ω, flows through the four, the 5th step discs between the 3rd step disc two brush
Resistance is 470 Ω, 94 Ω resistance R2Resistance be 470 Ω 1/5th, then flow through resistance R2Electric current is 1mA.For meeting node A
And between node B, the electric current of lower section is 1.2mA, it is necessary to make:
Resistance R11+ resistance R10Resistance=3250/3 Ω-(470/6 Ω+10 Ω)=995 Ω, wherein resistance R11Must be
859/12 Ω, therefore resistance R10Resistance is 11081/12 Ω.
Owing to the electromotive force of unsaturated standard cell is discrete, between 1.0188V～1.0196V, standardized work
Make current flowing resistance R8For 3.2mA, therefore resistance R8Take 318 Ω, additional 0～1 Ω lockable adjustable resistance RP3, can cover
The excursion of lid standard electromotive force of the cell.
Potential difference meter working power uses YJ49 type high stability adjustable stabilized voltage supply, and its zonal cooling is adjustable, in × 1 amount
Limit, this potential difference meter all-in resistance about 725 Ω, voltage about 2.3V under 3.2mA electric current, YJ49 type high stability can be used adjustable surely
The power supply regulation power supply of that section, the 1～3V of voltage source, and pass through the range of accommodation adjustable resistance R at 0～100 ΩP1Potential difference meter
3.2mA state in standard operating current can be fine-tuned.
Limiting in × 0.1 amount, standardized operating current flows through resistance R9For 0.32mA, therefore resistance R9Take 3180 Ω, additional
0～10 Ω lockable adjustable resistance RP4, can be with the excursion of coverage criteria cell emf.By regulation resistance 0～
Adjustable resistance R between 1000 ΩP2Allow potential difference meter can be adjusted to the 0.32mA state of standard operating current.
When, after operating current standardization, n put by I measurement dish1, n put by ii measurement dish2, n put by ii I measurement dish3, iv is surveyed
N put by amount dish4, n put by V measurement dish5, switch K throws the left side, at this moment connects measured " UX" voltage is between two terminals:
UX=1 × 100n1+1×10×10+10n2-1.2×859/12-1×1(10-n3)-0.1×1(10-n4)-0.1×
10-0.1×0.1(10-n5)-0.1×20(mV)
UX=100n1+10n2+100-85.9-10+n3-1+0.1n4-1-0.1+0.01n5-2(mV)
UX=100n1+10n2+n3+0.1n4+0.01n5(mV)。
The standard operating current of potential difference meter is obtained by: limit in × 1 amount, 1V standard signal voltage by polarity and electricity
Tentiometer " Ux" two measure terminal and connect, the total indicating value of each step disc of potential difference meter is identical with standard signal magnitude of voltage, double-pole pair
Throw switch K2Throw to the left side, regulate adjustable resistance RP1, make galvanometer G nulling；Again by double-point double-throw switch K2Throw to the right, regulation
Adjustable resistance RP3, make galvanometer G nulling, after repeating once, adjustable resistance RP3Locking；Limit in × 0.1 amount, 0.1V is marked
Calibration signal voltage is by polarity and potential difference meter " Ux" two measure terminal and connect, the total indicating value of each step disc of potential difference meter is believed with standard
Number magnitude of voltage is identical, double-point double-throw switch K2Throw to the left side, regulate adjustable resistance RP1, regulation adjustable resistance RP2Galvanometer G is made to refer to
Zero；Again by double-point double-throw switch K2Throw to the right, regulate adjustable resistance RP4, make galvanometer G nulling, after repeating once, can
Adjust resistance RP4Locking, at this moment the operating current of potential difference meter is with regard to standardization, when instrument uses, first proofreads standard, be to reading dial
When carrying out reading, reading again after check and correction standard.
Claims (1)
1. using a potential difference meter for five step discs, it has range of accommodation adjustable resistance R between 0～100 ΩP1, adjust
Adjusting range adjustable resistance R between 0～1000 ΩP2, range of accommodation lockable adjustable resistance R between 0～1 ΩP3, adjust
Adjusting range is lockable adjustable resistance R between 0～10 ΩP4, have two double-point double-throw switch, have five step discs, Mei Gebu
Enter on dish by being respectively arranged with 0,1, the measurement dish of 2 ... 10 totally 11 gears and replacement dish composition, the measurement dish of each step disc and generation
Changing on dish and to weld the resistance one that resistance is identical between two adjacent gear positions contacts, measurement dish and replacement dish are Tong Bu when rotating, survey
Amount dish often increases a resistance, and replacement dish just reduces by a resistance, and the total resistance of holding circuit is constant；It is characterized in that: the first step
Enter dish by being respectively arranged with 0,1, measurement dish I and the replacement dish I ' composition of 2 ... 10 totally 11 gears, on measurement dish and replacement dish every two
The metal contact ring welding 100 Ω resistance one, the metal contact ring of measurement dish I and replacement dish I ' between individual adjacent gear positions contact is used
Wire connects, and the second step disc, by being respectively arranged with 0,1, the measurement dish II of 2 ... 10,11 gears and replacement dish II ' composition, is measured totally
10 Ω resistance one, the metal contact ring of measurement dish II and replacement dish is welded between each two adjacent gear positions contact on dish and replacement dish
The metal contact ring of II ' passes through 1100 Ω resistance R1Connect, the 3rd step disc by being respectively arranged with 0,1,2 ... 10 totally 11 gears
Measurement dish III and replacement dish III ' composition, measurement dish and replacement dish weld between each two adjacent gear positions contact 1 Ω resistance one
Only, the metal contact ring of measurement dish III and the metal contact ring of replacement dish III ' are by 94 Ω resistance R2Connect, the 4th step disc
By being respectively arranged with 0,1, the measurement dish IV of 2 ... 10 totally 11 gears and replacement dish IV ' composition, each two on measurement dish and replacement dish
Welding 1 Ω resistance one between adjacent gear positions contact, the metal contact ring of measurement dish IV passes through with the metal contact ring of replacement dish IV '
900 Ω resistance R3Connecting, the 5th step disc is by being respectively arranged with 0,1, the measurement dish V of 2 ... 10 totally 11 gears and replacement dish V ' group
Become, measurement dish and replacement dish weld between each two adjacent gear positions contact 0.1 Ω resistance one, the metal contact ring of measurement dish V
889 Ω resistance R are passed through with the metal contact ring of replacement dish V '4Connect；Connect node A after current from working power E positive pole to be divided into
Two-way a: upwards road connects replacement dish II ' the 10th contact on the second step disc, replacement dish II ' the 0th contact connects the first step disc
Upper replacement dish I ' the 10th contact, on the first step disc, the 0th contact of measurement dish I connects on the second step disc measurement dish II the 10th and touches
Point, with double-point double-throw switch K after measurement dish II the 0th contact connection node B1K1-1Layer normally-closed contact connects, double-point double-throw switch
K1Put × 1 amount in limited time, electric current is through 318 Ω resistance R8, range of accommodation lockable adjustable resistance R between 0～1 ΩP3To double
Double-pole double throw switch K1K1-2Layer normally-closed contact, then through range of accommodation adjustable resistance R between 0～100 ΩP1To work electricity
Source E negative pole；Double-point double-throw switch K1Put × 0.1 amount in limited time, electric current is through 3180 Ω resistance R9, range of accommodation is between 0～10 Ω
Lockable adjustable resistance RP4To double-point double-throw switch K1K1-2Layer normally-closed contact, then through range of accommodation 0～1000 Ω it
Between adjustable resistance RP2, adjustable resistance RP1To working power E negative pole；Lead up to downwards 11081/12 Ω resistance R5Connect the 3rd
0th contact of replacement dish III ' on step disc, the 10th contact of replacement dish III ' connects the of replacement dish IV ' on the 4th step disc
0 contact, the 10th contact of replacement dish IV ' connects the 0th contact of replacement dish V ', measurement dish on the 5th step disc on the 5th step disc
10th contact of V connects the 0th contact of measurement dish IV on the 4th step disc, and the 10th contact of measurement dish IV connects the 3rd step disc
0th contact of upper measurement dish III, the 10th contact of measurement dish III is through 859/12 Ω resistance R11Connect node B, potential difference meter
For connecting measured " UX" two terminals, positive pole terminal connects measurement dish I the 10th contact, and negative pole terminal is normally closed through two
The double-point double-throw switch K of galvanometer G it is connected between contact2It is connected with measurement dish V the 0th contact afterwards, potential difference meter internal attachment standard electricity
Pond ENNegative pole is connected to the double-point double-throw switch K of galvanometer G between two normally-closed contacts2Connect 100K Ω resistance R7Afterwards with double
Double-pole double throw switch K1K1-2Layer normally-closed contact connects, internal attachment standard battery ENPositive pole connects double-point double-throw switch K1K1-1Layer is often
Closed contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610707784.0A CN106291042A (en) | 2016-08-17 | 2016-08-17 | Use the potential difference meter of five step discs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610707784.0A CN106291042A (en) | 2016-08-17 | 2016-08-17 | Use the potential difference meter of five step discs |
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| Publication Number | Publication Date |
|---|---|
| CN106291042A true CN106291042A (en) | 2017-01-04 |
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ID=57615560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610707784.0A Pending CN106291042A (en) | 2016-08-17 | 2016-08-17 | Use the potential difference meter of five step discs |
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| CN (1) | CN106291042A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU941903A1 (en) * | 1980-06-30 | 1982-07-07 | Предприятие П/Я В-2539 | Multi-limit step dc potentiometer |
| CN101769951A (en) * | 2009-12-30 | 2010-07-07 | 富阳精密仪器厂 | Two-measuring-range potential difference meter with four metering panels |
| CN201576040U (en) * | 2009-12-30 | 2010-09-08 | 方宁妹 | Potential difference meter |
| CN104101754A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Micro-electric potential measurement instrument |
| CN104101759A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Potentiometer with five stepping plates |
| CN104101756A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Voltage measuring apparatus with five stepping plates |
| CN104133102A (en) * | 2014-07-24 | 2014-11-05 | 富阳兴远仪器仪表经营部 | Voltage measurement instrument capable of increasing measurement range by changing work current |
| CN204008797U (en) * | 2014-07-24 | 2014-12-10 | 袁乐香 | There is the potential difference meter of five step discs |
-
2016
- 2016-08-17 CN CN201610707784.0A patent/CN106291042A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU941903A1 (en) * | 1980-06-30 | 1982-07-07 | Предприятие П/Я В-2539 | Multi-limit step dc potentiometer |
| CN101769951A (en) * | 2009-12-30 | 2010-07-07 | 富阳精密仪器厂 | Two-measuring-range potential difference meter with four metering panels |
| CN201576040U (en) * | 2009-12-30 | 2010-09-08 | 方宁妹 | Potential difference meter |
| CN104101754A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Micro-electric potential measurement instrument |
| CN104101759A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Potentiometer with five stepping plates |
| CN104101756A (en) * | 2014-07-24 | 2014-10-15 | 富阳兴远仪器仪表经营部 | Voltage measuring apparatus with five stepping plates |
| CN104133102A (en) * | 2014-07-24 | 2014-11-05 | 富阳兴远仪器仪表经营部 | Voltage measurement instrument capable of increasing measurement range by changing work current |
| CN204008797U (en) * | 2014-07-24 | 2014-12-10 | 袁乐香 | There is the potential difference meter of five step discs |
Non-Patent Citations (1)
| Title |
|---|
| 苗延霞 等: "UJ25型及其它几种六盘代换式直流电位差计线路简析", 《计量与测试技术》 * |
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