CN103439579A - Economical impedance measurement circuit - Google Patents
Economical impedance measurement circuit Download PDFInfo
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- CN103439579A CN103439579A CN2013103848075A CN201310384807A CN103439579A CN 103439579 A CN103439579 A CN 103439579A CN 2013103848075 A CN2013103848075 A CN 2013103848075A CN 201310384807 A CN201310384807 A CN 201310384807A CN 103439579 A CN103439579 A CN 103439579A
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- triode
- follower
- economical
- impedance measurement
- output terminal
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Abstract
The invention discloses an economical impedance measurement circuit. The economical impedance measurement circuit comprises a signal source, a main measurement circuit, a millivoltmeter and a follower, wherein the input end of the follower is connected with the output end of the signal source, the output end of the follower 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. The economical impedance measurement circuit has the advantages that needed materials can be obtained easily, manufacturing is simple, and cost is low. The economical impedance measurement circuit is applicable to people with low impedance measurement accuracy requirements and impedance comparison needed, and is particularly suitable for students. The performance of the economical impedance measurement circuit is stable.
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 economical impedance measurement loop, its cost is low, stable performance.
Technical scheme: the technical solution used in the present invention is a kind of economical impedance measurement loop, comprise signal source, measuring circuit and milivoltmeter, this circuit also comprises follower, the input end of follower is connected with the output terminal of signal source, the output terminal of this follower is connected with the input end of measuring circuit, and the output terminal of measuring circuit is connected with milivoltmeter; Follower comprises triode, the base stage of the first triode is connected with the output terminal of signal source, the emitter of this first triode is connected with the base stage of the second triode, and the collector of two triodes all connects positive voltage, the base stage of the 3rd triode is connected with the emitter of the second triode, the 3rd triode is as the output terminal of follower, the collector of the 3rd triode is by the 4th resistance access positive voltage, the emitter of the first triode is by the first resistance access negative voltage, and the 3rd triode is the access negative voltage of connecting with the 3rd resistance by the second resistance.
Output terminal in signal source adds follower, transfer overvoltage signal preferably, and simultaneously, follower of the present invention has certain amplification, by signal source is amplified, makes the easy starting of oscillation of measuring circuit.
Preferably, also include the second electric capacity, an end of described the second electric capacity is connected with the collector of the 3rd triode, the output terminal that its other end is follower.
Preferably, also comprise the first electric capacity, described the first electric capacity is in parallel with the 3rd resistance.
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 follower circuit figure of invention;
Fig. 3 is integrated circuit figure of the present invention.
Embodiment
As shown in Figure 1, the present invention includes economical impedance measurement loop, comprise signal source, measuring circuit and milivoltmeter, this circuit also comprises follower, the input end of follower is connected with the output terminal of signal source, the output terminal of this follower is connected with the input end of measuring circuit, and the output terminal of measuring circuit is connected with milivoltmeter;
As shown in Figure 2, follower comprises triode, described the first triode T
1base stage with the output terminal of signal source, be connected, this first triode T
1emitter and the second triode T
2base stage be connected, and the collector of two triodes all connects positive voltage, described the 3rd triode T
3base stage and the second triode T
2emitter be connected, the 3rd triode T
3as the output terminal of follower, the 3rd triode T
3collector by the 4th resistance access positive voltage, the first triode T
1emitter by the first resistance R
1the access negative voltage, the 3rd triode T
3by the second resistance R
2with the 3rd resistance R
3series connection access negative voltage.Also include the first capacitor C
1,the second capacitor C
2, the first capacitor C
1, the first capacitor C
1with the 3rd resistance R
3parallel connection, the second capacitor C
2an end and the 3rd triode T
3collector be connected, the output terminal that its other end is follower.
As shown in Figure 3, the output terminal of follower of the present invention and the 5th resistance R
5an end be connected, the 5th resistance R
5the other end and the 6th resistance R
6an end be connected, the 6th resistance R
6other end ground connection, the 5th resistance R
5the 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.
Output same frequency in fixed signal source is with the sinusoidal signal of amplitude, and milivoltmeter can be converted by voltage table, and resistance value is output voltage and input voltage ratio.
Material required for the present invention can be looked for everywhere, and making is simple, and cost is low, applicable accurately little to impedance measurement, but needs relatively the crowd use, particularly User of impedance magnitude, stable performance of the present invention.
Claims (3)
1. an economical impedance measurement loop, comprise signal source, measuring circuit and milivoltmeter, it is characterized in that: this circuit also comprises follower, the input end of described follower is connected with the output terminal of signal source, the output terminal of this follower is connected with the input end of measuring circuit, and the output terminal of described measuring circuit is connected with milivoltmeter; Described follower comprises triode, described the first triode (T
1) base stage with the output terminal of signal source, be connected, this first triode (T
1) emitter and the second triode (T
2) base stage be connected, and the collector of two triodes all connects positive voltage, described the 3rd triode (T
3) base stage and the second triode (T
2) emitter be connected, the 3rd triode (T
3) as the output terminal of follower, the 3rd triode (T
3) collector by the 4th resistance (R
4) the access positive voltage, the first triode (T
1) emitter by the first resistance (R
1) the access negative voltage, the 3rd triode (T
3) by the second resistance (R
2) and the 3rd resistance (R
3) series connection access negative voltage.
2. a kind of economical impedance measurement according to claim 1 loop, is characterized in that: also include the second electric capacity (C
2), described the second electric capacity (C
2) an end and the 3rd triode (T
3) collector be connected, the output terminal that its other end is follower.
3. a kind of economical impedance measurement according to claim 1 loop, it is characterized in that: described circuit also comprises the first electric capacity (C
1), described the first electric capacity (C
1) and the 3rd resistance (R
3) parallel connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103848075A CN103439579A (en) | 2013-08-30 | 2013-08-30 | Economical impedance measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103848075A CN103439579A (en) | 2013-08-30 | 2013-08-30 | Economical impedance measurement circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103439579A true CN103439579A (en) | 2013-12-11 |
Family
ID=49693284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013103848075A Pending CN103439579A (en) | 2013-08-30 | 2013-08-30 | Economical impedance measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103439579A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86210516U (en) * | 1986-12-22 | 1987-12-12 | 北京自动测试技术研究所 | Resistance measuring device with large measuring range |
| CN2229698Y (en) * | 1995-04-03 | 1996-06-19 | 天津师范大学 | Multi-function experimental teaching apparatus for electronic technique |
| WO2003023422A1 (en) * | 2001-09-06 | 2003-03-20 | Sumitomo Metal Industries, Ltd. | Capacitance measuring circuit, capacitance measuring instrument, and microphone device |
| CN1419222A (en) * | 2001-11-13 | 2003-05-21 | 骆乃光 | Modularized experiment equipment for teaching experiment |
| CN1749763A (en) * | 2005-11-03 | 2006-03-22 | 北京科技大学 | Method and device for detecting resistance |
| CN201166682Y (en) * | 2008-01-18 | 2008-12-17 | 王强 | Test circuit special for multimeter adaptive voltage cascade low-resistance |
| CN102147989A (en) * | 2011-03-30 | 2011-08-10 | 汪建 | Experimental apparatus for giant magneto-impedance (GMI) of amorphous wires |
| CN102842257A (en) * | 2012-08-03 | 2012-12-26 | 湖州文思必得科教仪器有限公司 | Demonstrating device for frequency-conversion sine alternating current characteristics |
| CN203134228U (en) * | 2013-04-07 | 2013-08-14 | 熊建云 | Electronic technology comprehensive experiment box |
-
2013
- 2013-08-30 CN CN2013103848075A patent/CN103439579A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86210516U (en) * | 1986-12-22 | 1987-12-12 | 北京自动测试技术研究所 | Resistance measuring device with large measuring range |
| CN2229698Y (en) * | 1995-04-03 | 1996-06-19 | 天津师范大学 | Multi-function experimental teaching apparatus for electronic technique |
| WO2003023422A1 (en) * | 2001-09-06 | 2003-03-20 | Sumitomo Metal Industries, Ltd. | Capacitance measuring circuit, capacitance measuring instrument, and microphone device |
| CN1419222A (en) * | 2001-11-13 | 2003-05-21 | 骆乃光 | Modularized experiment equipment for teaching experiment |
| CN1749763A (en) * | 2005-11-03 | 2006-03-22 | 北京科技大学 | Method and device for detecting resistance |
| CN201166682Y (en) * | 2008-01-18 | 2008-12-17 | 王强 | Test circuit special for multimeter adaptive voltage cascade low-resistance |
| CN102147989A (en) * | 2011-03-30 | 2011-08-10 | 汪建 | Experimental apparatus for giant magneto-impedance (GMI) of amorphous wires |
| CN102842257A (en) * | 2012-08-03 | 2012-12-26 | 湖州文思必得科教仪器有限公司 | Demonstrating device for frequency-conversion sine alternating current characteristics |
| CN203134228U (en) * | 2013-04-07 | 2013-08-14 | 熊建云 | Electronic technology comprehensive experiment box |
Non-Patent Citations (3)
| Title |
|---|
| 佚名: "实验九 阻抗的测量", 《百度文库HTTP://WENKU.BAIDU.COM/VIEW/87A10FE4AEAAD1F346933F79.HTML》 * |
| 沈珮等: "超宽带SiGe HBT低噪声放大器的设计和分析", 《高技术通讯》 * |
| 陈杰: "LCR测量仪在阻抗测量中的应用", 《电子产品可靠性与环境试验》 * |
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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 |