CN204347146U - Capacitance meter - Google Patents
Capacitance meter Download PDFInfo
- Publication number
- CN204347146U CN204347146U CN201520002008.1U CN201520002008U CN204347146U CN 204347146 U CN204347146 U CN 204347146U CN 201520002008 U CN201520002008 U CN 201520002008U CN 204347146 U CN204347146 U CN 204347146U
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- China
- Prior art keywords
- frequency division
- selector switch
- channel selector
- square
- capacitance
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- 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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Abstract
The utility model provides a kind of capacitance meter, comprise: microprocessor, multi-resonant oscillating circuit, frequency division module, channel selector switch, data-carrier store, LCD MODULE, serial communication interface, described microprocessor is electrically connected on frequency division module, channel selector switch, data-carrier store, LCD MODULE, serial communication interface, measured capacitance and 555 chips form multi-resonant oscillating circuit, the square-wave signal that measured capacitance values size is converted to certain frequency size by oscillatory circuit exports, the output square-wave signal of oscillatory circuit is divided into two parts, a part is directly connected with channel selector switch, another part is connected with channel selector switch after frequency division module frequency division again.The utility model capacitance meter introduces frequency division module and channel selector switch, then can realize being measure gear automatically to adjust; In addition, the utility model capacitance meter have that measuring accuracy is high, measurement range, the feature such as simple to operate.
Description
Technical field
The utility model relates to electronic surveying field, is specially a kind of capacitance meter.
Background technology
Along with the development of electronic industrial technology, observation and control technology, the surveying instrument demand of electronic devices and components is increasing, often need measure the capacitance size of components and parts in various application scenario.
When producing and keep in repair electronic devices and components, measured capacitance value is a vital link often.A good electronic product must be made up of qualified electronic devices and components, and wherein electric capacity is one of basic device, and the detection of capacitance is inevitable link for this reason.Equally, maintenance personal in the maintenance of electronic product, the detection of circuit is the most basic, and whether sometimes need all parts in testing circuit working properly, whether capacitor is working properly.Therefore, reliable design, safety, capacitance measuring tester has great real necessity easily.
Now be specifically designed to measured capacitance value instrument on the market few, the more common instrument of general use carrys out Detection capacitance, then common capacitance detection method has, multimeter detection method, fuse simple testing method, incandescent lamp bulb and capacitor Series detectors method, megohmmeter detection method etc., its ultimate principle is the charge-discharge characteristic utilizing electric capacity, magnitude of voltage is checked with instrument, capacitance size by calculating, inferring, lower, the complicated operation of measuring accuracy, the feature such as bothersome for this reason, not easily promote the use of, general only whether fine or not for Detection capacitance, and non-measured capacitance.Present stage, amount capacitance size common method had three kinds, and one is adopt bridge circuit measuring method, converts measured capacitance values size to voltage swing, after measuring voltage value again, instead release measured capacitance values size; Two is the square-wave signals utilizing oscillatory circuit method generation pulse width to be directly proportional to capacitance, and realize by measuring output voltage after filtering, the method hardware circuit is simple, but software simulating is relatively complicated; Three is utilize monostable trigger device to produce the door pulse signal that to be directly proportional to capacitance, rear control is by the break-make of the standard count pulse of counter, judge capacitance according to the discharge and recharge time, this measuring method hardware circuit is complicated, and cannot intuitively show capacitance size.
Utility model content
The technical matters that the utility model solves is to provide a kind of capacitance meter, to solve the problem proposed in above-mentioned background technology.
The technical matters that the utility model solves realizes by the following technical solutions: capacitance meter, comprise: microprocessor, multi-resonant oscillating circuit, frequency division module, channel selector switch, data-carrier store, LCD MODULE, serial communication interface, described microprocessor is electrically connected on frequency division module, channel selector switch, data-carrier store, LCD MODULE, serial communication interface, measured capacitance and 555 chips form multi-resonant oscillating circuit, the square-wave signal that measured capacitance values size is converted to certain frequency size by oscillatory circuit exports, the output square-wave signal of oscillatory circuit is divided into two parts, a part is directly connected with channel selector switch, another part is connected with channel selector switch after frequency division module frequency division again.
Described multi-resonant oscillating circuit comprises resistance R1, R2, ground connection after resistance R1, R2, measured capacitance Cx series connection, wherein another termination power of R1 5 volts of voltages, No. 6 pins of 555 chips, No. 2 pin short circuits in parallel with No. 7 pins and R2,555 No. 3, chip pins are as square-wave signal output terminal, square-wave output signal is connected with channel selector switch with frequency division module respectively, and wherein the pass of square-wave signal frequency size and electric capacity Cx is f=1.443/ (C
x* (R
1+ 2*R
2)).
Compared with prior art, the beneficial effects of the utility model are: microprocessor is introduced on the basis in the method that the utility model capacitance meter is measured at multi-harmonic-oscillations, multi-resonant oscillating circuit converts measured capacitance values size the square-wave signal of certain frequency to, microprocessor only need measure the size of square-wave signal frequency values, then can realize the measurement of electric capacity, the utility model capacitance meter introduces frequency division module and channel selector switch, then can realize being measure gear automatically to adjust, measurement capacitance can be uploaded to PC by reserved serial communication interface, with the demand of satisfied different occasion.The utility model capacitance meter has that measuring accuracy is high, measurement range, the feature such as simple to operate.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present utility model.
Fig. 2 is multi-resonant oscillating circuit circuit diagram of the present utility model.
Fig. 3 is frequency division module circuit diagram of the present utility model.
Fig. 4 is channel selector switch circuit diagram of the present utility model.
Fig. 5 is microcontroller circuit figure of the present utility model.
Fig. 6 is serial communication interface circuit figure of the present utility model.
Fig. 7 is data-carrier store circuit diagram of the present utility model.
Fig. 8 is LCD MODULE circuit diagram of the present utility model.
Embodiment
In order to make actualizing technology means of the present utility model, creation characteristic, reach object and effect is easy to understand, below in conjunction with concrete diagram, set forth the utility model further.
As shown in Figure 1, capacitance meter, comprise: microprocessor, multi-resonant oscillating circuit, frequency division module, channel selector switch, data-carrier store, LCD MODULE, serial communication interface, described microprocessor is electrically connected on frequency division module, channel selector switch, data-carrier store, LCD MODULE, serial communication interface, measured capacitance and 555 chips form multi-resonant oscillating circuit, the square-wave signal that measured capacitance values size is converted to certain frequency size by oscillatory circuit exports, the output square-wave signal of oscillatory circuit is divided into two parts, a part is directly connected with channel selector switch, another part is connected with channel selector switch after frequency division module frequency division again.
The first-selected embodiment of capacitance meter of the present utility model comprises microprocessor multi-resonant oscillating circuit frequency division module channel selector switch.Channel selector switch acquiescence gating multi-resonant oscillating circuit output terminal is connected with microprocessor, the square-wave signal frequency size that microprocessor inputs according to program computation, as after conversion, capacitance is excessive, then microprocessor starts frequency division module work automatically, and divider ratio size is set, and the communicating passage of switching channel selector switch, make the signal after the signal switching of input microprocessor to frequency division module frequency division, under can ensureing the prerequisite of precision like this, increase measurement range.The data that microprocessor calculates gained carry out buffer memory by data-carrier store, result of calculation is shown by LCD MODULE, described reserved serial communication interface by microprocessor driven, for measurement data is uploaded to PC, with the demand of satisfied different occasion.
Multi-resonant oscillating circuit as shown in Figure 2 in the present embodiment, ground connection after resistance R1, R2, measured capacitance Cx series connection, wherein another termination power of R1 5 volts of voltages, No. 6 pins of 555 chips, No. 2 pin short circuits in parallel with No. 7 pins and R2,555 No. 3, chip pins are as square-wave signal output terminal, square-wave output signal is connected with channel selector switch with frequency division module respectively, and wherein the pass of square-wave signal frequency size and electric capacity Cx is.
Channel selector switch acquiescence gating switch is that multi-resonant oscillating circuit output port is connected with microprocessor in the present embodiment, when microprocessor program calculating gained capacitance numerical value is excessive, then microprocessor starts frequency division module work by program automatically, and divide ratio size is set, then be the signal after frequency division module frequency division by programed channel selector switch switched input signal.
In the present embodiment, LCD MODULE is for the capacitance size that shows microprocessor and calculated and range unit value, microprocessor is according to divider ratio size and the capacitance calculating gained, calculated actual capacitance value magnitude numerical value and the range gear of current measured capacitance by algorithm, after range unit and numerical value are shown on numerical value display module.
Data-carrier store in the present embodiment can be located at microprocessor internal, also can be the standalone module being located at microprocessor outside.
In the present embodiment, serial communication interface is as spare interface, and its effect is that the capacitance values that microprocessor can be calculated gained is uploaded to PC, with the demand of satisfied different occasion.
More than show and describe ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.Claimed scope of the present utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. a capacitance meter, it is characterized in that: it comprises: microprocessor, multi-resonant oscillating circuit, frequency division module, channel selector switch, data-carrier store, LCD MODULE, serial communication interface, described microprocessor is electrically connected on frequency division module, channel selector switch, data-carrier store, LCD MODULE, serial communication interface, measured capacitance and 555 chips form multi-resonant oscillating circuit, the square-wave signal that measured capacitance values size is converted to certain frequency size by oscillatory circuit exports, the output square-wave signal of oscillatory circuit is divided into two parts, a part is directly connected with channel selector switch, another part is connected with channel selector switch after frequency division module frequency division again.
2. capacitance meter according to claim 1, it is characterized in that: described multi-resonant oscillating circuit comprises resistance R1, R2, ground connection after resistance R1, R2, measured capacitance Cx series connection, wherein another termination power of R1 5 volts of voltages, No. 6 pins of 555 chips, No. 2 pin short circuits in parallel with No. 7 pins and R2,555 No. 3, chip pins are as square-wave signal output terminal, square-wave output signal is connected with channel selector switch with frequency division module respectively, and wherein the pass of square-wave signal frequency size and electric capacity Cx is f=1.443/ (C
x* (R
1+ 2*R
2)).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520002008.1U CN204347146U (en) | 2015-01-04 | 2015-01-04 | Capacitance meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520002008.1U CN204347146U (en) | 2015-01-04 | 2015-01-04 | Capacitance meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204347146U true CN204347146U (en) | 2015-05-20 |
Family
ID=53230407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520002008.1U Expired - Fee Related CN204347146U (en) | 2015-01-04 | 2015-01-04 | Capacitance meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204347146U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158635A (en) * | 2015-09-30 | 2015-12-16 | 国家电网公司 | Partial-discharge sensor safety detection circuit and method |
| CN106841820A (en) * | 2017-03-24 | 2017-06-13 | 湖北工程学院 | Multrirange capacitance measurement circuit, device and method |
-
2015
- 2015-01-04 CN CN201520002008.1U patent/CN204347146U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158635A (en) * | 2015-09-30 | 2015-12-16 | 国家电网公司 | Partial-discharge sensor safety detection circuit and method |
| CN105158635B (en) * | 2015-09-30 | 2018-06-01 | 国家电网公司 | A kind of partial discharge sensor safe detection circuit and method |
| CN106841820A (en) * | 2017-03-24 | 2017-06-13 | 湖北工程学院 | Multrirange capacitance measurement circuit, device and method |
| CN106841820B (en) * | 2017-03-24 | 2023-10-03 | 湖北工程学院 | Multi-range capacitance measuring circuit, device and method |
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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: 20150520 Termination date: 20160104 |