CN203069676U - High-accuracy capacitance tester - Google Patents
High-accuracy capacitance tester Download PDFInfo
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- CN203069676U CN203069676U CN 201320097594 CN201320097594U CN203069676U CN 203069676 U CN203069676 U CN 203069676U CN 201320097594 CN201320097594 CN 201320097594 CN 201320097594 U CN201320097594 U CN 201320097594U CN 203069676 U CN203069676 U CN 203069676U
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- 239000004973 liquid crystal related substance Substances 0.000 claims abstract 2
- 238000005259 measurement Methods 0.000 abstract description 12
- 239000003990 capacitor Substances 0.000 description 18
- 238000010586 diagram Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000003534 oscillatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012353 t test Methods 0.000 description 1
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Abstract
本实用新型公开了一种高精度电容测试仪，包括换挡控制电路、多谐振荡器、比较器、单片机、显示电路和量程选择电路；所述换挡控制电路、多谐振荡器和比较器依次连接，所述比较器还与所述单片机相连接，所述换挡控制电路也与所述单片机相连接；所述单片机还与所述显示电路和量程选择电路相连接。所述量程选择电路包括多个按键；所述换挡控制电路包括三个继电器；多谐振荡器由运放构成的滞回比较器结合RC延迟网络构成；比较器由包括电压比较器LM311；显示电路包括液晶显示器LCD1602。本实用新型的高精度电容测试仪，具有电容的测量精度高、测量范围大且显示直观等优点。
The utility model discloses a high-precision capacitance tester, which comprises a shift control circuit, a multivibrator, a comparator, a single-chip microcomputer, a display circuit and a range selection circuit; the shift control circuit, the multivibrator and the comparator connected in turn, the comparator is also connected with the single-chip microcomputer, and the shift control circuit is also connected with the single-chip microcomputer; the single-chip microcomputer is also connected with the display circuit and the range selection circuit. The range selection circuit includes a plurality of buttons; the shift control circuit includes three relays; the multivibrator is composed of a hysteresis comparator composed of an operational amplifier combined with an RC delay network; the comparator includes a voltage comparator LM311; the display The circuit includes a liquid crystal display LCD1602. The high-precision capacitance tester of the utility model has the advantages of high capacitance measurement precision, large measurement range, intuitive display, and the like.
Description
Technical field
The utility model relates to a kind of high-accuracy capacitor tester.
Background technology
Electric capacity is a kind of very important and very commonly used electronic component.Along with The application of new technique, the application of electric capacity more and more widely.But the test difficult problem of capacitor production unit is not only in the test of the capacitance of electric capacity, also is one of work difficult problem of electric capacity applying unit simultaneously.In the prior art, generally adopt multimeter to come the capacitance of testing capacitor, adopt the mode of multimeter testing capacitor to have following shortcoming: 1) to be subjected to the measurement range restriction of multimeter easily; Can't test for the electric capacity in measurement range not; The capacitance of the measurement of general digital multimeter greatly about 2000pF between 20 microfarads, the electric capacity that exceeds this scope can't be measured, the narrow range of measurement; 2) digimer can be measured the numerical value of electric capacity in its range ability, but its measuring accuracy is less.
The utility model content
The utility model is the weak point that exists in the above-mentioned prior art for avoiding, and a kind of high-accuracy capacitor tester is provided, with the measuring accuracy that improves electric capacity and enlarge measurement range.
The utility model be the technical solution problem by the following technical solutions.
High-accuracy capacitor tester, its design feature are to comprise gearshift control circuit, multivibrator, comparer, single-chip microcomputer, display circuit and selective circuit of measuring range; Described gearshift control circuit, multivibrator are connected successively with comparer, and described comparer also is connected with described single-chip microcomputer, and described gearshift control circuit also is connected with described single-chip microcomputer; Described single-chip microcomputer also is connected with selective circuit of measuring range with described display circuit.
High-accuracy capacitor tester of the present utility model also has following technical characterstic.
Described selective circuit of measuring range comprises a plurality of buttons; Described gearshift control circuit comprises three relays; Multivibrator is made of in conjunction with the RC delay network the hysteresis loop comparator that amplifier constitutes; Comparer is by comprising voltage comparator LM311; Display circuit comprises LCD LCD1602.
Compared with the prior art, the utility model beneficial effect is embodied in:
High-accuracy capacitor tester of the present utility model can freely be selected range by selective circuit of measuring range, and can shift gears by the gearshift control circuit and adjust the output of oscillator, measures capacitance range and is: 100p ± 10%; F～10000 pF, big more than the measurement range of general multimeter, its measuring accuracy is ± 10%.Adopt LCD to show measurement result, intuitive display.
High-accuracy capacitor tester of the present utility model has advantages such as the big and intuitive display of the measuring accuracy height, measurement range of electric capacity.
Description of drawings
Fig. 1 is the structured flowchart of high-accuracy capacitor tester of the present utility model.
Fig. 2 is the circuit diagram of the selective circuit of measuring range of high-accuracy capacitor tester of the present utility model.
Fig. 3 is the circuit diagram of the gearshift control circuit of high-accuracy capacitor tester of the present utility model.
Fig. 4 is the circuit diagram of the multivibrator of high-accuracy capacitor tester of the present utility model.
Fig. 5 is the circuit diagram of the comparer of high-accuracy capacitor tester of the present utility model.
Fig. 6 is the single-chip microcomputer of high-accuracy capacitor tester of the present utility model and the circuit diagram of display circuit.
Below pass through embodiment, and the utility model is described in further detail by reference to the accompanying drawings.
Embodiment
Referring to Fig. 1, the high-accuracy capacitor tester comprises gearshift control circuit, multivibrator, comparer, single-chip microcomputer, display circuit and selective circuit of measuring range; Described gearshift control circuit, multivibrator are connected successively with comparer, and described comparer also is connected with described single-chip microcomputer, and described gearshift control circuit also is connected with described single-chip microcomputer; Described single-chip microcomputer also is connected with selective circuit of measuring range with described display circuit.
Pass through selective circuit of measuring range, can be under a plurality of ranges, select under the situation of a suitable range, range by the single-chip microcomputer identification selection, and control gearshift control circuit, corresponding resistance is inserted multivibrator circuit, the output of generation square wave, this square wave changes into the square wave that single-chip microcomputer can be identified by single limit comparer, input/output port by single-chip microcomputer is counted it, obtains the square wave cycle, exports square wave computation of Period formula according to the cycle in conjunction with concrete multivibrator and draws the capacitance that connects, and send into the display circuit demonstration, finish the capacitance numeral and show.
Described selective circuit of measuring range comprises a plurality of buttons; Described gearshift control circuit comprises three relays; Multivibrator is made of in conjunction with the RC delay network the hysteresis loop comparator that amplifier constitutes; Comparer is by comprising voltage comparator LM311; Display circuit comprises LCD LCD1602.
As Fig. 2, selective circuit of measuring range is realized by button, is provided with six press keys, and each button is representing different ranges, is respectively: 100PF, 1nF, 10nF, 100nF, 1uF and 10uF.One end ground connection of button, the other end connects the input/output port of single-chip microcomputer, and single-chip microcomputer can be determined selected range value, and carry out corresponding operating by selected range by identification input/output port level value.As Fig. 3, the gearshift control circuit is realized by relay, comprise three relays combinations driving circuit separately, the circuit structure of three relays is the same, relay drive circuit is realized by the on-off circuit that triode S9012 constitutes, the base potential of Single-chip Controlling triode, during low level, transistor turns, during high level, transistor ends, respectively in both cases, can select different paths by relay, three group relaies can be realized the selection of six paths, just in time the selection of corresponding six ranges.
As Fig. 4, multivibrator is made of in conjunction with the RC delay network the hysteresis loop comparator that amplifier constitutes, the structure of the hysteresis loop comparator that constitutes of amplifier, R1, R2, R3 and two stabilivolts wherein, and threshold voltage is determined by R1, R2 and stabilivolt voltage stabilizing value.C1 is testing capacitance, resistance R 4 to R9 is measured six required resistance values for gearshift, have six values altogether from 100 Europe to 10M, resistance value must determine to consider the restriction in single-chip microcomputer identification square wave cycle, and under different ranges, the square wave frequency of input single-chip microcomputer is all at thousand orders of magnitude, be fit to the single-chip microcomputer counting, and more accurate, this circuit is in order to reduce amplifier to the influence of delay network, and having adopted input stage is the amplifier OPA2132 of field effect transistor.
As Fig. 5, comparer is made of LM311, output outer meeting resistance R10, be pull-up resistor, this circuit significant feature is that the square wave of input is changed into the square wave that single-chip microcomputer can be identified, at the incoming wave instantaneous value greater than zero the time, be output as 5V, input square wave instantaneous value is output as 0 less than zero the time.
Be single-chip microcomputer and display circuit as Fig. 6, single-chip microcomputer adopts general AT89S52 to realize that the minimum system circuit comprises oscillatory circuit, and reset circuit and storer are selected three parts.Oscillatory circuit provides reference frequency for internal circuit, is made of C1, C2 and crystal oscillator.Reset circuit adopts the mode of electrification reset, is made of R1 and C3.Storer selects port EA to connect high level, adopts internal storage.Display circuit is realized that by LCD1602 this display element can show 32 letter or numbers of two row etc., can be used to show concrete capacitance in the design, and is convenient, simple and practical.
High-accuracy capacitor tester of the present utility model can freely be selected range by selective circuit of measuring range, and can shift gears by the gearshift control circuit and adjust the output of oscillator, measures capacitance range and is: 100p ± 10%; F～10000 pF, big more than the measurement range of general multimeter, its measuring accuracy is ± 10%.Adopt LCD to show measurement result, intuitive display.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320097594 CN203069676U (en) | 2013-03-04 | 2013-03-04 | High-accuracy capacitance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320097594 CN203069676U (en) | 2013-03-04 | 2013-03-04 | High-accuracy capacitance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203069676U true CN203069676U (en) | 2013-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320097594 Expired - Fee Related CN203069676U (en) | 2013-03-04 | 2013-03-04 | High-accuracy capacitance tester |
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| Country | Link |
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| CN (1) | CN203069676U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103743420A (en) * | 2013-11-21 | 2014-04-23 | 成都市宏山科技有限公司 | Measuring circuit for capacitance sensor |
| CN115267349A (en) * | 2022-08-05 | 2022-11-01 | 浙江大学 | Multi-channel weak capacitance detection system and method based on LabVIEW |
-
2013
- 2013-03-04 CN CN 201320097594 patent/CN203069676U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103743420A (en) * | 2013-11-21 | 2014-04-23 | 成都市宏山科技有限公司 | Measuring circuit for capacitance sensor |
| CN115267349A (en) * | 2022-08-05 | 2022-11-01 | 浙江大学 | Multi-channel weak capacitance detection system and method based on LabVIEW |
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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: 20130717 Termination date: 20150304 |
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| EXPY | Termination of patent right or utility model |