CN202453410U - Galvanometer - Google Patents
Galvanometer Download PDFInfo
- Publication number
- CN202453410U CN202453410U CN2012200359839U CN201220035983U CN202453410U CN 202453410 U CN202453410 U CN 202453410U CN 2012200359839 U CN2012200359839 U CN 2012200359839U CN 201220035983 U CN201220035983 U CN 201220035983U CN 202453410 U CN202453410 U CN 202453410U
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- China
- Prior art keywords
- circuit unit
- galvanometer
- circuit
- preamplifying
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- Expired - Fee Related
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- 238000012360 testing method Methods 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
The utility model discloses a galvanometer, which relates to the field of detecting apparatus, and is designed to improve the accuracy and sensitivity of measurement. The galvanometer comprises a former stage amplifying circuit unit which is used for improving the input impedance of the galvanometer and amplifying an input signal, a final stage amplifying circuit unit which is connected with the former stage amplifying circuit unit is used for improving the input impedance of the former stage amplifying circuit unit and amplifying the input signal further, and an indicating circuit unit which is connected with the final stage amplifying circuit unit and is used for outputting and displaying the current of the detected circuit. The galvanometer is suitable for the current detection of the detected circuit.
Description
Technical field
The utility model relates to the detecting instrument field, relates in particular to a kind of galvanometer.
Background technology
A lot of experimental projects all need use galvanometer in the College Physics, also have some experimental projects need use embedded galvanometric equipment, and galvanometric equipment also will have been used in other laboratory in the university.The galvanometric input internal resistance of tradition is lower, will produce bigger influence to measurement result.
The utility model content
The utility model technical matters to be solved is to provide a kind of can either improve the galvanometer that measuring accuracy has higher sensitivity again.
For solving the problems of the technologies described above, the technical scheme that the utility model galvanometer adopts is:
A kind of galvanometer comprises:
The preamplifying circuit unit is used to improve said galvanometric input impedance, and the signal of input is amplified;
Back level amplifier circuit unit links to each other with said preamplifying circuit unit, is used to improve the input impedance of said preamplifying circuit unit, and the signal of said input is done further amplification;
The indicating circuit unit links to each other with said back level amplifier circuit unit, is used for the size of current of detected circuit-under-test is exported demonstration.
Said preamplifying circuit unit is a constant-current source type FET differential amplifier circuit;
Said back level amplifier circuit unit is the two-stage calculation amplifying circuit.
Further, said indicating circuit unit comprises: indicating section, and with the holding circuit that links to each other with said indicating section.
Said holding circuit comprises: a resistance that is in series with gauge outfit; With a bi-directional voltage stabilizing pipe that installs additional at said gauge outfit and said resistance two ends.
Said galvanometer also comprises: power supply unit links to each other with said holding circuit with said preamplifying circuit unit, back level amplifier circuit unit respectively.
Said galvanometer also comprises: the zeroing circuit unit with said preamplifying circuit unit links to each other is used for galvanometer is returned to zero.
Compared with prior art, the utility model galvanometer has improved input impedance simultaneously owing to be provided with the prime amplification path to amplify feeble signal, has reduced the influence of testing circuit to circuit-under-test, has improved the precision of measuring; Simultaneously again owing to adopt back level amplifying circuit, both guaranteed that preamplifying circuit can stably work, improved the sensitivity of system again.
Description of drawings
Fig. 1 is the structural principle block diagram of the utility model;
Fig. 2 is the circuit theory diagrams of the utility model.
Embodiment
The utility model aims to provide and a kind ofly can either improve the galvanometer that measuring accuracy has higher sensitivity again.Below in conjunction with accompanying drawing and embodiment the utility model is elaborated.
The utility model galvanometer comprises:
Preamplifying circuit unit 10 is used to improve said galvanometric input impedance, and the signal of input is amplified;
Back level amplifier circuit unit 20 links to each other with said preamplifying circuit unit, is used to improve the input impedance of said preamplifying circuit unit, and the signal of said input is done further amplification;
Indicating circuit unit 30 links to each other with said back level amplifier circuit unit, is used for the size of current of detected circuit-under-test is exported demonstration.
The utility model galvanometer has improved input impedance simultaneously owing to be provided with the prime amplification path to amplify feeble signal, has reduced the influence of testing circuit to circuit-under-test, has improved the precision of measuring; Simultaneously again owing to adopt back level amplifying circuit, both guaranteed that preamplifying circuit can stably work, improved the sensitivity of system again.
Wherein, said preamplifying circuit unit is a constant-current source type FET differential amplifier circuit; Said back level amplifier circuit unit is the two-stage calculation amplifying circuit.
Said indicating circuit unit 30 comprises: indicating section 301, and with the holding circuit 302 that links to each other with said indicating section.Wherein, said holding circuit comprises: a resistance that is in series with gauge outfit; With a bi-directional voltage stabilizing pipe that installs additional at said gauge outfit and said resistance two ends.
Adopt gauge outfit to be connected in series a resistance and install a bi-directional voltage stabilizing pipe additional at two ends, gauge outfit reaches state completely partially when regulating resistance stabilivolt being punctured, and outrange never when so just having guaranteed the use galvanometer can effectively prevent the damage of indicator.Because voltage breakdown is less than the driving circuit output voltage, so the faint variation of power source voltage will can not influence the partially full of gauge outfit, and the sensitivity that has improved display module.
Further, said galvanometer also comprises: power supply unit 40 links to each other with said holding circuit with said preamplifying circuit unit, back level amplifier circuit unit respectively.The utility model galvanometer itself adds feed circuit, thereby makes galvanometer possess characteristics such as easy to use.
Further, said galvanometer also comprises: the zeroing circuit unit 50 with said preamplifying circuit unit links to each other is used for galvanometer is returned to zero.Preset zero resistance R5 accurately regulates the earlier rough balance adjustment of circuit by zero-regulator resistor R1 then.
The utility model galvanometer, said each circuit is made on the circuit board, and power supply adopts battery.Be fixed on gauge outfit inside to circuit board and battery, effectively utilized the inner space and kept the original structure of gauge outfit.
The above; Be merely the preferred embodiments of the utility model, but the protection domain of the utility model is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within the protection domain of the utility model.Therefore, the protection domain of the utility model should be as the criterion by said protection domain with claim.
Claims (6)
1. a galvanometer is characterized in that, comprising:
The preamplifying circuit unit is used to improve said galvanometric input impedance, and the signal of input is amplified;
Back level amplifier circuit unit links to each other with said preamplifying circuit unit, is used to improve the input impedance of said preamplifying circuit unit, and the signal of said input is done further amplification;
The indicating circuit unit links to each other with said back level amplifier circuit unit, is used for the size of current of detected circuit-under-test is exported demonstration.
2. galvanometer according to claim 1 is characterized in that, said preamplifying circuit unit is a constant-current source type FET differential amplifier circuit;
Said back level amplifier circuit unit is the two-stage calculation amplifying circuit.
3. galvanometer according to claim 1 and 2 is characterized in that, said indicating circuit unit comprises: indicating section, and with the holding circuit that links to each other with said indicating section.
4. galvanometer according to claim 3 is characterized in that, said holding circuit comprises: a resistance that is in series with gauge outfit; With
A bi-directional voltage stabilizing pipe that installs additional at said gauge outfit and said resistance two ends.
5. galvanometer according to claim 4 is characterized in that, said galvanometer also comprises: power supply unit links to each other with said holding circuit with said preamplifying circuit unit, back level amplifier circuit unit respectively.
6. galvanometer according to claim 1 is characterized in that, said galvanometer also comprises: the zeroing circuit unit with said preamplifying circuit unit links to each other is used for galvanometer is returned to zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200359839U CN202453410U (en) | 2012-01-30 | 2012-01-30 | Galvanometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200359839U CN202453410U (en) | 2012-01-30 | 2012-01-30 | Galvanometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202453410U true CN202453410U (en) | 2012-09-26 |
Family
ID=46869265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200359839U Expired - Fee Related CN202453410U (en) | 2012-01-30 | 2012-01-30 | Galvanometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202453410U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061818A (en) * | 2017-12-15 | 2018-05-22 | 云南电网有限责任公司曲靖供电局 | A kind of virtual potential discriminating gear |
-
2012
- 2012-01-30 CN CN2012200359839U patent/CN202453410U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061818A (en) * | 2017-12-15 | 2018-05-22 | 云南电网有限责任公司曲靖供电局 | A kind of virtual potential discriminating gear |
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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: 20120926 Termination date: 20140130 |