CN202948043U - Open type Wheatstone bridge experimental instrument - Google Patents
Open type Wheatstone bridge experimental instrument Download PDFInfo
- Publication number
- CN202948043U CN202948043U CN 201220523350 CN201220523350U CN202948043U CN 202948043 U CN202948043 U CN 202948043U CN 201220523350 CN201220523350 CN 201220523350 CN 201220523350 U CN201220523350 U CN 201220523350U CN 202948043 U CN202948043 U CN 202948043U
- Authority
- CN
- China
- Prior art keywords
- wheatstone bridge
- open
- arm
- experiment instrument
- experimental instrument
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The utility model relates to a Wheatstone bridge experimental instrument, which belongs to the technical field of physics teaching instrumental equipments. The experimental instrument comprises a ratio arm R1, a ratio arm R2, a comparison arm R3, a resistor Rx to be measured, a direct current power source and a current meter. The ratio arm R1, the ratio arm R2, the comparison arm R3, the resistor Rx to be measured, the direct current power source, the current meter and connecting lines are all fixed on an open horizontal fixed panel. The ratio arm R1, the ratio arm R2, the comparison arm R3, the resistor Rx to be measured, the power source, and the current meter are connected to form the Wheatstone bridge experimental instrument circuit. The upper part of the open horizontal fixed panel is not covered. The open type Wheatstone bridge experimental instrument which adopts an open type structure for resistance measurement enables a visual experimental process and easy observation.
Description
Technical field
The utility model relates to a kind of Wheatstone bridge experiment instrument, and is especially a kind of for open Wheatstone bridge experiment instrument, belongs to physics teaching instrument and equipment technical field.
Background technology
Wheatstone bridge has four brachium pontis, R
1, R
2Be ratio arms (R
1/ R
2Be called multiplying power), R
3For comparing arm, R
xBe testing resistance, be connected into galvanometer in bridge circuit, as balance indicator.During measurement, regulate ratio arms and the numerical value that compares arm, make the galvanometer nulling, at this moment electric bridge reaches balance, and R is arranged during balance
x=R
1/ R
2R
3, formula is the equilibrium condition of Wheatstone bridge, according to multiplying power R
1/ R
2With comparison arm R
3Size, can calculate testing resistance R
xResistance.
Measurement mechanism is the important component part of Wheatstone bridge experiment instrument, and its function is with the physical quantity Measurement accuracy out, and the quality of measurement mechanism has determined the measurement effect of Wheatstone bridge experiment instrument.
At present, existing Wheatstone bridge experiment instrument is box experiment instrument, and the brachium pontis of electric bridge, galvanometer, power supply and connection line be can't see inner structure all in cabinet interior when the experimenter uses, and experimental principle and experimentation are not directly perceived.
Summary of the invention
The utility model is for the deficiencies in the prior art, the open Wheatstone bridge experiment instrument that provide a kind of novelty simple in structure, experimental result is accurate, experimental principle is directly perceived, is easy to observe.
The technical solution of the utility model is as follows:
A kind of open Wheatstone bridge experiment instrument comprises four brachium pontis, a direct supply and a galvanometer, and described four brachium pontis are respectively ratio arms R
1, R
2, arm R relatively
3With testing resistance R
x, ratio arms R wherein
1, R
2, arm R relatively
3, testing resistance R
x, direct supply, galvanometer and connection line all be fixed on open horizontal fixed panel and naked, formation Wheatstone bridge experiment instrument circuit after described brachium pontis, power supply and galvanometer are connected.
Described ratio arms R
1, R
2Numerical value is adjustable.
Described relatively arm R
3Numerical value is adjustable.
Described direct supply is the 4.5V direct supply.
This open Wheatstone bridge experiment instrument is arranged on open horizontal fixed panel.
Preferably, described open wheatstone bridge experiment instrument is fixed on open horizontal fixed panel and is naked, experimentation is simple, accurately, be easy to observe.
The beneficial effects of the utility model are: open Wheatstone bridge experiment instrument of the present utility model carries out resistance measurement by the open instruments may structure, and experimentation is directly perceived, and easily observation and result are obvious, sensitive, accurate.
The utility model is simple in structure, easy to make; Open Wheatstone bridge experiment instrument adopts open knot, if component wear in experiment, for ease of maintenaince and change.
Description of drawings
Fig. 1 is the structural representation of open Wheatstone bridge experiment instrument.
Wherein, 1, open horizontal fixed panel; 2, ratio arms R
13, ratio arms R
24, ratio arms point; 5, compare arm R
36, galvanometer; 7, current-limiting resistance; 8, direct supply; 9, power switch; 10, galvanometer switch; 11, testing resistance Rx.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further, but the utility model protection domain is not limited to this.
Embodiment 1: as shown in Figure 1, a kind of open Wheatstone bridge experiment instrument, this open Wheatstone bridge experiment instrument are arranged on open horizontal fixed panel 1, and fixed panel conveniently moves and observes for open horizontal fixed panel.
Open Wheatstone bridge experiment instrument comprises ratio arms R
1, R
2, arm R relatively
3, testing resistance R
x, direct supply, galvanometer and connection line, described all being fixed on open horizontal fixed panel.
R in ratio arms
1And R
2Four resistance are arranged respectively: 0.99 ohm, 8.902 ohm, 81.009 ohm and 409.09 ohm, R
1And R
2Ratio correspondence 0.001,0.01,0.1,1,10,100 and 1000, arm R relatively
3Four adjustable resistances (unit: ohm) are arranged: 9 * 1,9 * 10,9 * 100,9 * 1000, galvanometer is 0.5 grade of galvanometer.Connect A with wire and be connected connection C and power switch with current-limiting resistance, A is to D all-in resistance formation brachium pontis R
1, A consists of brachium pontis R to the B all-in resistance
2, C consists of brachium pontis R to the B all-in resistance
3, testing resistance access R
xThe place consists of brachium pontis R
xPower supply is the 4.5V direct supply.
Principle of work of the present utility model:
Connect DC power supply switch K
1With the galvanometer K switch
2, make the electric bridge energising, suitably choose multiplying power R
1/ R
2, change relatively arm R
3Resistance sizes, make galvanometer be designated as zero, electric bridge reaches balance, according to formula R
x=R
1/ R
2R
3, testing resistance value R
xNamely can calculate.
Only need to change multiplying power R on open Wheatstone bridge experiment instrument
1/ R
2With comparison arm R
3Resistance sizes, institute's measuring resistance value just can be intuitively, significantly be presented in face of the experimenter.
Claims (5)
1. an open Wheatstone bridge experiment instrument, comprise four brachium pontis, a direct supply and a galvanometer, it is characterized in that: described four brachium pontis are respectively ratio arms R
1, R
2, arm R relatively
3With testing resistance R
x, ratio arms R wherein
1, R
2, arm R relatively
3, testing resistance R
x, direct supply, galvanometer and connection line all be fixed on open horizontal fixed panel and naked, formation Wheatstone bridge experiment instrument circuit after described brachium pontis, power supply and galvanometer are connected.
2. open Wheatstone bridge experiment instrument according to claim 1, is characterized in that: described ratio arms R
1, R
2Numerical value is adjustable.
3. open Wheatstone bridge experiment instrument according to claim 1, is characterized in that: described relatively arm R
3Numerical value is adjustable.
4. open Wheatstone bridge experiment instrument according to claim 1, it is characterized in that: described power supply is the 4.5V direct supply.
5. open Wheatstone bridge experiment instrument according to claim 1, it is characterized in that: this open Wheatstone bridge experiment instrument is arranged on open horizontal fixed panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220523350 CN202948043U (en) | 2012-10-15 | 2012-10-15 | Open type Wheatstone bridge experimental instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220523350 CN202948043U (en) | 2012-10-15 | 2012-10-15 | Open type Wheatstone bridge experimental instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202948043U true CN202948043U (en) | 2013-05-22 |
Family
ID=48423739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220523350 Expired - Fee Related CN202948043U (en) | 2012-10-15 | 2012-10-15 | Open type Wheatstone bridge experimental instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202948043U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529302A (en) * | 2013-09-24 | 2014-01-22 | 国家电网公司 | Performance test circuit and test method for photovoltaic module |
| CN104865444A (en) * | 2015-06-02 | 2015-08-26 | 天津大学 | Teaching aid adopting resistance sorting measurement circuit and teaching method thereof |
| CN108957136A (en) * | 2018-06-27 | 2018-12-07 | 深圳探科技术有限公司 | Multi-grade measuring device and its bridge circuit for measurement |
| CN110441604A (en) * | 2019-07-17 | 2019-11-12 | 湖北工业大学 | The circuit and method of resistance are accurately measured in Wheatstone bridge using computer |
-
2012
- 2012-10-15 CN CN 201220523350 patent/CN202948043U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103529302A (en) * | 2013-09-24 | 2014-01-22 | 国家电网公司 | Performance test circuit and test method for photovoltaic module |
| CN103529302B (en) * | 2013-09-24 | 2017-12-12 | 国家电网公司 | The performance test circuit and method of testing of a kind of photovoltaic module |
| CN104865444A (en) * | 2015-06-02 | 2015-08-26 | 天津大学 | Teaching aid adopting resistance sorting measurement circuit and teaching method thereof |
| CN108957136A (en) * | 2018-06-27 | 2018-12-07 | 深圳探科技术有限公司 | Multi-grade measuring device and its bridge circuit for measurement |
| CN110441604A (en) * | 2019-07-17 | 2019-11-12 | 湖北工业大学 | The circuit and method of resistance are accurately measured in Wheatstone bridge using computer |
| CN110441604B (en) * | 2019-07-17 | 2021-10-29 | 湖北工业大学 | Circuit and method for accurately measuring resistance in Wheatstone bridge by using computer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130522 Termination date: 20131015 |