CN103439578A - Impedance measurement circuit - Google Patents
Impedance measurement circuit Download PDFInfo
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- CN103439578A CN103439578A CN201310384621XA CN201310384621A CN103439578A CN 103439578 A CN103439578 A CN 103439578A CN 201310384621X A CN201310384621X A CN 201310384621XA CN 201310384621 A CN201310384621 A CN 201310384621A CN 103439578 A CN103439578 A CN 103439578A
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- China
- Prior art keywords
- amplifier
- measurement circuit
- impedance measurement
- impedance
- signal source
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses an impedance measurement circuit which comprises a signal source, a main measurement circuit, a millivoltmeter and an amplifier, wherein the input end of the amplifier is connected with the output end of the signal source, the output end of the amplifier is connected with the input end of the main measurement circuit, and the output end of the main measurement circuit is connected with the millivoltmeter. Materials needed by the impedance measurement circuit are easy to obtain, the manufacturing method is simple, and cost is low. The impedance measurement circuit is suitable for being used by people who do not have high requirements for accuracy of impedance measurement but need to compare impedance, and especially suitable for student users. The impedance measurement circuit is stable in performance.
Description
Technical field
The present invention relates to a kind of metering circuit, particularly for measuring the circuit of impedance.
Background technology
At present, the multiple range impedance measuring Instrument of multi-usage, can be in order to characteristic impedance of effective parallel connection of the high-frequency dielectric loss of the electric capacity of the inductance value of the Q value of measuring high-frequency inductor or resonant tank, inductor and distributed electrical capacity, capacitor and loss angle, electrical material, radio circuit and resistance in series, transmission line etc.Although, but current impedance measuring Instrument Q table precision is high, it is expensive, applicable crowd is narrower, and popularity rate is low, and particularly for students, when being tested, needed surveying instrument accuracy requirement is not high, unable the bearing but dutiable value is expensive.
Therefore need a kind of new technical scheme to solve the problems referred to above.
Summary of the invention
Goal of the invention: the problem and shortage existed for above-mentioned prior art, the purpose of this invention is to provide a kind of impedance measuring circuit, its cost is low, stable performance.
Technical scheme: the technical solution used in the present invention is a kind of impedance measuring circuit, comprise: signal source, measuring circuit and milivoltmeter, also comprise amplifier, the input end of this amplifier is connected with the output terminal of signal source, the output terminal of amplifier is connected with the input end of measuring circuit, and the output terminal of described measuring circuit is connected with milivoltmeter.
Output terminal in signal source connects a homophase amplifier, and good amplification input signal can easier starting of oscillation at measuring circuit electric capacity and inductance and make, and simultaneously, its input impedance of in-phase amplifier is large, little on the loop impact.
Preferably, amplifier is in-phase amplifier.
Preferably, signal source adopts digital function generator.
Preferably, in-phase amplifier comprises: the amplifier chip, described amplifier chip adopts TLO82.
Beneficial effect: compared with prior art, its advantage is that material required for the present invention can be looked for everywhere in the present invention, and makes simple, cost is low, applicable accurately little to impedance measurement, but needs the relatively crowd of impedance magnitude to use, User particularly, stable performance of the present invention.
The accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the in-phase amplifier circuit diagram of invention;
Fig. 3 is integrated circuit figure of the present invention.
Embodiment
As shown in Figure 1, the present invention includes: signal source, measuring circuit, milivoltmeter and amplifier, the input end of this amplifier is connected with the output terminal of signal source, and the output terminal of amplifier is connected with the input end of measuring circuit, and the output terminal of described measuring circuit is connected with milivoltmeter.This amplifier adopts in-phase amplifier, and signal source adopts digital function generator, and in-phase amplifier comprises: the amplifier chip, this amplifier chip adopts TLO82.
As shown in Figure 2, the input end of signal source is added to the normal phase input end of amplifier chip, and its inverting input is by the first resistance R
1ground connection, output voltage is by the first resistance R
1with the second resistance R
2the dividing potential drop effect, act on inverting input.
As described in Figure 3, the output terminal of in-phase amplifier of the present invention and the 3rd resistance R
3an end be connected, the 3rd resistance R
3the other end and the 4th resistance R
4an end be connected, the 4th resistance R
4other end ground connection, the 3rd resistance R
3the other end access tested inductance L
xan end, tested inductance L
xthe other end with an end of variable capacitance, be connected, the other end ground connection of variable capacitance, measured capacitance C
xin parallel with variable capacitance.
The output voltage of in-phase amplifier is by the 3rd resistance R
3with the 4th resistance R
4the dividing potential drop effect, act on metering circuit, for the impedance that reduces signal source and the in-phase amplifier impact on metering circuit.When the tested inductance L of access
xthe time, measured capacitance C
xplace in circuit not, to measured capacitance C
xin like manner.
Output same frequency in fixed signal source is with the sinusoidal signal of amplitude, and milivoltmeter can be converted by voltage table.
Claims (4)
1. an impedance measuring circuit, comprise: signal source, measuring circuit and milivoltmeter, it is characterized in that: this circuit also comprises amplifier, the input end of described amplifier is connected with the output terminal of signal source, the output terminal of this amplifier is connected with the input end of measuring circuit, and the output terminal of described measuring circuit is connected with milivoltmeter.
2. a kind of impedance measurement according to claim 1 loop, it is characterized in that: described amplifier is in-phase amplifier.
3. a kind of impedance measurement according to claim 1 loop, it is characterized in that: signal source is function generator.
4. according to claim 1 or 2 described a kind of impedance measurement loops, it is characterized in that: in-phase amplifier comprises: the amplifier chip, described amplifier chip adopts TLO82.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310384621XA CN103439578A (en) | 2013-08-30 | 2013-08-30 | Impedance measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310384621XA CN103439578A (en) | 2013-08-30 | 2013-08-30 | Impedance measurement circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103439578A true CN103439578A (en) | 2013-12-11 |
Family
ID=49693283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310384621XA Pending CN103439578A (en) | 2013-08-30 | 2013-08-30 | Impedance measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103439578A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422192A (en) * | 2017-08-02 | 2017-12-01 | 广州市锐丰音响科技股份有限公司 | Audio frequency apparatus input impedance measuring method and device, measurement method of calibration and device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2229698Y (en) * | 1995-04-03 | 1996-06-19 | 天津师范大学 | Multi-function experimental teaching apparatus for electronic technique |
| CN1150248A (en) * | 1995-10-30 | 1997-05-21 | 中国航空工业总公司第014中心 | On-line measuring method and apparatus for resistance, capacity and inductance |
| CN1310342A (en) * | 2000-02-22 | 2001-08-29 | 梅忠恕 | Network resistor virtual separating test techn and its application |
| WO2003023422A1 (en) * | 2001-09-06 | 2003-03-20 | Sumitomo Metal Industries, Ltd. | Capacitance measuring circuit, capacitance measuring instrument, and microphone device |
| CN101726638A (en) * | 2008-10-10 | 2010-06-09 | 英业达股份有限公司 | Isolating circuit and impedance detecting circuit having the same |
| CN202066910U (en) * | 2011-05-20 | 2011-12-07 | 湖州师范学院 | Device for measuring resistance, inductance and capacitance |
| CN202393855U (en) * | 2012-01-16 | 2012-08-22 | 东莞理工学院 | LCR tester |
| CN102944744A (en) * | 2012-11-06 | 2013-02-27 | 昆山北极光电子科技有限公司 | Low-drift online impedance measurement circuit |
-
2013
- 2013-08-30 CN CN201310384621XA patent/CN103439578A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2229698Y (en) * | 1995-04-03 | 1996-06-19 | 天津师范大学 | Multi-function experimental teaching apparatus for electronic technique |
| CN1150248A (en) * | 1995-10-30 | 1997-05-21 | 中国航空工业总公司第014中心 | On-line measuring method and apparatus for resistance, capacity and inductance |
| CN1310342A (en) * | 2000-02-22 | 2001-08-29 | 梅忠恕 | Network resistor virtual separating test techn and its application |
| WO2003023422A1 (en) * | 2001-09-06 | 2003-03-20 | Sumitomo Metal Industries, Ltd. | Capacitance measuring circuit, capacitance measuring instrument, and microphone device |
| CN101726638A (en) * | 2008-10-10 | 2010-06-09 | 英业达股份有限公司 | Isolating circuit and impedance detecting circuit having the same |
| CN202066910U (en) * | 2011-05-20 | 2011-12-07 | 湖州师范学院 | Device for measuring resistance, inductance and capacitance |
| CN202393855U (en) * | 2012-01-16 | 2012-08-22 | 东莞理工学院 | LCR tester |
| CN102944744A (en) * | 2012-11-06 | 2013-02-27 | 昆山北极光电子科技有限公司 | Low-drift online impedance measurement circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422192A (en) * | 2017-08-02 | 2017-12-01 | 广州市锐丰音响科技股份有限公司 | Audio frequency apparatus input impedance measuring method and device, measurement method of calibration and device |
| CN107422192B (en) * | 2017-08-02 | 2020-05-08 | 广州市锐丰音响科技股份有限公司 | Audio equipment input impedance measuring method and device and measurement and verification method and device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20131211 |