CN203616374U - DC potentiometer experimental device adopting constant current source - Google Patents
DC potentiometer experimental device adopting constant current source Download PDFInfo
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- CN203616374U CN203616374U CN201320704002.XU CN201320704002U CN203616374U CN 203616374 U CN203616374 U CN 203616374U CN 201320704002 U CN201320704002 U CN 201320704002U CN 203616374 U CN203616374 U CN 203616374U
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- constant current
- current source
- gear
- galvanometer
- potentiometer
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Abstract
The utility model provides a DC potentiometer experimental device adopting a constant current source. The DC potentiometer experimental device adopts a precision digital constant current source which is connected with a gear adjustable measuring disc, an electromotive force to be measured is connected with the measuring disc in parallel, a high-sensitivity galvanometer and a galvanometer protecting resistor are connected in series, and the protecting resistor is provided with a short circuit switch. During experimental operations, an appropriate gear resistor is selected through a gear shifting knob according to a range of the electromotive force to be measured, current of the constant current source is changed through a constant current source rough adjusting knob, that is, voltage at two ends of the measuring disc is changed, indication of the galvanometer is enabled to be zero, then the protection resistor is enabled to get short circuit, indication of the galvanometer is enabled to be zero again through a constant current source fine adjusting knob, a current value displayed by the constant current source and a resistance value of the gear corresponding to the measuring disc of are read, and a value of the electromotive force to be measured can be calculated. The DC potentiometer experimental device adopting the constant current device is clear and understandable in principle and compact in structure, calibration is carried out without using a standard electromotive force, circuit connection is simple, the operation is easy, and an experiment effect can be effectively improved.
Description
Technical field
The utility model relates to a kind of Experiment of College Physics device, specifically relates to a kind of DC potentiometer experimental provision that adopts constant current source.
Background technology
Voltage table can be used for measuring roughly the electromotive force of power supply, but can not Accurate Measurement, because power supply forms loop with voltage table, power supply inside must have electric current to pass through, and power supply all has internal resistance, so the voltage that voltage table records must be less than electromotive force of source.In recent years, digital voltmeter easy to use is more universal, and its internal resistance is high, and accuracy of measurement also substantially exceeds needle dc voltmeter, but up to now still not as good as the most accurate potential difference meter.Potential difference meter is one of key instrument of accurately measuring electromotive force and potential difference (PD), because it has applied compensation principle and comparative measurement method, so measuring accuracy is higher.Be characterized in: not affecting in loop to be measured and work loop electric current in the situation that, known voltage on unknown voltage and potential difference meter is compared, thereby make measurement result depend on the higher standard cell of accuracy, resistance and the high galvanometer of sensitivity.Due to above-mentioned advantage, potential difference meter is one of most widely used instrument in precision measurement, be usually used in electrician and thermal measurement, not only be used for accurately measuring electromotive force, voltage, electric current and resistance etc., can also be used to calibrate the instrument such as various precision electrical meters and direct current bridge, in the electrical measuring method of non-electric parameter (as temperature, pressure, displacement and speed etc.), also occupy critical role.Potential meter experiment is a common experimental project in Experiment of College Physics, and at present, in Experiment of College Physics, potential meter experiment adopts slide wire type 11 line potential meters more.This experimental provision mainly has the following disadvantages:
One, all needs first connecting circuit before each measurement, utilizes standard eleotromotive force to calibrate, and then reconnects circuit and measure, connection more complicated, and complex operation, it is more difficult when student tests, generally to feel.
Its two, potential difference meter resistance wire is easily loosening, affects experimental precision.
Its three, the easy loose contact of contact on resistance wire, and be easy to damage.
Utility model content
In order to overcome the above-mentioned deficiency of prior art, the utility model proposes a kind of DC potentiometer experimental provision that adopts precision digital DC constant current power supply, this principle of device is clear understandable, simple and compact for structure, simple to operation.
The utility model solves the technical scheme that its technical matters adopts: adopt a precision digital DC constant current power supply to be connected with the adjustable measurement dish of a gear, according to the size of electromotive force to be measured, can select suitable gear resistance by gear shift knob, can change constant current source size of current by constant current source adjusting knob, thereby change the voltage at measurement dish two ends.Electromotive force to be measured is in parallel with measurement dish; and be in series with high sensitivity galvanometer; be used to refer to the electric current in circuit; be in series with galvanometer protective resistance; be used for protecting galvanometer, avoid the excessive damage galvanometer of electric current, protective resistance arranges short circuiting switch; short-circuit protection resistance when electric current is very little in circuit, to improve experiment measuring precision.When experimental implementation; first according to the magnitude range of electromotive force to be measured; select suitable gear resistance by gear shift knob, then change constant current source size of current by constant current source coarse adjustment knob, change the voltage at measurement dish two ends; make galvanometer be designated as zero; next the protective resistance of closing short circuiting switch, by constant current source fine tuning knob, makes galvanometer again be designated as zero; read the current value of now constant current source demonstration and the resistance value of measurement dish institute respective notch, just can calculate the value of electromotive force to be measured.
The beneficial effects of the utility model are, this principle of device is clear understandable, and compact conformation does not need to utilize standard eleotromotive force to calibrate, and connection is fairly simple, and processing ease can effectively improve experiment effect.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is structural representation of the present utility model.
The corresponding resistance R of 1. gear one in Fig. 1
1, the 2. corresponding resistance R of gear two
2, the 3. corresponding resistance R of gear three
3, the 4. corresponding resistance R of gear four
4, the 5. corresponding resistance R of gear five
5, the 6. corresponding resistance R of gear six
6, the 7. corresponding resistance R of gear seven
7, the 8. corresponding resistance R of gear eight
8, 9. gear shift knob, 10. high sensitivity galvanometer G, 11. electromotive force V to be measured
x, 12. galvanometer protective resistance R
sshort circuiting switch K, 13. galvanometer protective resistance R
s, 14. precision digital DC constant current power supplies, 15. constant current source coarse adjustment knobs, 16. constant current source fine tuning knobs, 17. constant current source switch keys, 18. constant current source electric current display screens, the adjustable measurement dish of 19. gear.
Embodiment
In Fig. 1, adopt a precision digital DC constant current power supply 14 to be connected with the adjustable measurement dish 19 of a gear, measurement dish is divided into eight grades, and corresponding different gear resistance, is respectively the corresponding resistance R of gear one respectively
11, the corresponding resistance R of gear two
22, the corresponding resistance R of gear three
33, the corresponding resistance R of gear four
44, the corresponding resistance R of gear five
55, the corresponding resistance R of gear six
66, the corresponding resistance R of gear seven
77, the corresponding resistance R of gear eight
88, according to electromotive force V to be measured
x11 size, can select suitable gear resistance by gear shift knob 9, can change roughly fast constant current source size of current by constant current source coarse adjustment knob 15, can further accurately regulate constant current source size of current by constant current source fine tuning knob 16, coil the voltage at 19 two ends thereby change measurement.Electromotive force V to be measured
x11 coil 19 in parallelly with measurement, and are in series with high sensitivity galvanometer G, are used to refer to the electric current in circuit, are in series with galvanometer protective resistance R
s13, be used for protecting galvanometer, avoid the excessive damage galvanometer of electric current, protective resistance arranges galvanometer protective resistance R
sshort circuiting switch K12, short-circuit protection resistance when electric current is very little in circuit, to improve experiment measuring precision.
Specific experiment operation steps is:
(1), according to Fig. 1, connection line, disconnects protective resistance R
sshort circuiting switch K12.
(2) according to electromotive force V to be measured
x11 magnitude range, selects gear resistance suitable on adjustable measurement dish 19 by gear shift knob 9, such as selecting the corresponding resistance R of gear three
33.
(3) open precision digital DC constant current power supply 14 by constant current source switch key 17, change roughly fast constant current source size of current by constant current source coarse adjustment knob 15, change the voltage at measurement dish two ends, make high sensitivity galvanometer G10 be designated as zero.
(4) the protective resistance R that next closes
sshort circuiting switch K12, by constant current source fine tuning knob 16, make high sensitivity galvanometer G10 again be designated as zero.
(5) read the current value I that now precision digital DC constant current power supply 14 shows
0, just can calculate the value V of electromotive force to be measured
x=I
0r
3.
Above structure of the present utility model is set forth, but the not conditional intention of the embodiment that the utility model is introduced, and not deviating from the scope of the utility model purport, the utility model can have multiple variation and modification.
Claims (3)
1. one kind adopts the DC potentiometer experimental provision of constant current source; comprise that a constant current source is connected with the adjustable measurement dish of a gear; electromotive force to be measured is in parallel with measurement dish; be in series with high sensitivity galvanometer and galvanometer protective resistance; it is characterized in that: the constant current source adopting is a precision digital DC constant current power supply; can change roughly fast constant current source size of current by constant current source coarse adjustment knob; can further accurately regulate constant current source size of current by constant current source fine tuning knob, thereby change the voltage at measurement dish two ends.
2. the DC potentiometer experimental provision of employing constant current source according to claim 1, is characterized in that: gear is adjustable, and measurement dish is divided into eight grades, respectively corresponding different gear resistance.
3. the DC potentiometer experimental provision of employing constant current source according to claim 1, is characterized in that: galvanometer protective resistance arranges short circuiting switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320704002.XU CN203616374U (en) | 2013-11-11 | 2013-11-11 | DC potentiometer experimental device adopting constant current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320704002.XU CN203616374U (en) | 2013-11-11 | 2013-11-11 | DC potentiometer experimental device adopting constant current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203616374U true CN203616374U (en) | 2014-05-28 |
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ID=50769005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320704002.XU Expired - Fee Related CN203616374U (en) | 2013-11-11 | 2013-11-11 | DC potentiometer experimental device adopting constant current source |
Country Status (1)
| Country | Link |
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| CN (1) | CN203616374U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108510856A (en) * | 2018-06-17 | 2018-09-07 | 承德石油高等专科学校 | A kind of Physical Experiment drum-type electro tentiometer teaching aid and its application method |
| CN108766148A (en) * | 2018-05-29 | 2018-11-06 | 西安电子科技大学 | Program-controlled potential difference meter experiment instrument |
| CN112648013A (en) * | 2020-12-25 | 2021-04-13 | 河北煤炭科学研究院有限公司 | Electrode conversion tool for direct current method instrument |
-
2013
- 2013-11-11 CN CN201320704002.XU patent/CN203616374U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108766148A (en) * | 2018-05-29 | 2018-11-06 | 西安电子科技大学 | Program-controlled potential difference meter experiment instrument |
| CN108766148B (en) * | 2018-05-29 | 2020-09-15 | 西安电子科技大学 | Program control potentiometer experimental instrument |
| CN108510856A (en) * | 2018-06-17 | 2018-09-07 | 承德石油高等专科学校 | A kind of Physical Experiment drum-type electro tentiometer teaching aid and its application method |
| CN108510856B (en) * | 2018-06-17 | 2023-11-24 | 承德石油高等专科学校 | Drum-type potentiometer teaching aid for physical experiment and application method thereof |
| CN112648013A (en) * | 2020-12-25 | 2021-04-13 | 河北煤炭科学研究院有限公司 | Electrode conversion tool for direct current method instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140528 Termination date: 20141111 |
|
| EXPY | Termination of patent right or utility model |