CN202870179U - LCR measuring instrument - Google Patents
LCR measuring instrument Download PDFInfo
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- CN202870179U CN202870179U CN 201220529506 CN201220529506U CN202870179U CN 202870179 U CN202870179 U CN 202870179U CN 201220529506 CN201220529506 CN 201220529506 CN 201220529506 U CN201220529506 U CN 201220529506U CN 202870179 U CN202870179 U CN 202870179U
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Abstract
The utility model discloses an LCR measuring instrument. The LCR measuring instrument comprises a measurement circuit, a control circuit, a channel selection circuit and a display circuit. The measurement circuit comprises a 555 multivibrator used for measuring capacitance and resistance and a capacitance three-point type oscillator used for measuring inductance, the control circuit comprises a one-chip microcomputer controller and a button selection circuit, the channel selection circuit comprises a selection analog switch, and the display circuit comprises three LED lamps of different colors and an LED display circuit. The LCR measuring instrument adopts the one-chip microcomputer, can improve the reliability and stability of a system, facilitating debugging and maintenance, and the LCR measuring instrument can realize automatic measurement of resistance, inductance and capacitance, and is practical and convenient.
Description
Technical field
The utility model relates to a kind of surveying instrument, belongs to automatic gauge and technical field of measurement and test, particularly a kind of LCR measuring instrument.
Background technology
At present, along with the development of electronics industry, electronic devices and components sharply increase, and the scope of application of electronic devices and components is also extensively got up gradually, and we usually will measure the size of resistance, electric capacity, inductance in application.Resistance measurement is divided into fall-of-potential method, scale operation device method and integrator computing unit method according to the method that produces constant current source.Scale operation device method measuring error is slightly large, and the integrator computing unit method is applicable to high-resistance measurement.Traditional measurement capacitive method has two kinds of resonance method and bridge methods.The former circuit is simple, and speed is fast, but precision is low; Latter's measuring accuracy is high, but speed is slow.Along with the development of Digital Measuring Technique, have greatly improved at measuring speed and precision, the digitized measurement of electric capacity often adopts constant flow method and relative method.Inductance measurement can be according to alternating current bridge method, although the equilibrium process of inductance measuring alternating current bridge is complicated more accurately for this measuring method, and also larger by the method error of measuring the definite inductance of Q value.Therefore, reliable design, safety, resistance, electric capacity, electric inductance measuring-testing instrument have very large real necessity easily.
The utility model content
The purpose of this utility model is in order to overcome the problems referred to above, a kind of LCR measuring instrument to be provided.
For achieving the above object, the method that the utility model adopts is: a kind of LCR measuring instrument, comprise metering circuit, control circuit, channel selection circuit and display circuit, described metering circuit comprises for 555 multivibrators of measuring electric capacity and resistance and is used for the capacitance connecting three point type oscillator of inductance measuring, described control circuit comprises singlechip controller and button selection circuit, described channel selecting comprises a selection analog switch, and described display circuit comprises LED lamp and the LED display circuit of 3 different colours.
As a kind of improvement of the present utility model, it is the single-chip microcomputer of AT89S52 that described singlechip controller adopts model.
As a kind of improvement of the present utility model, described 3 LED lamps connect in common anode utmost point mode.
As a kind of improvement of the present utility model, described LED display circuit comprises 1 74HC02,2 74LS573,1 2803 driving and 6 charactron, and adopts common anode utmost point mode to connect and compose.
As a kind of improvement of the present utility model, the model of described analog switch is CD4052.
The beneficial effects of the utility model are:
The utility model adopts single-chip microcomputer can improve the reliability and stability of system, is beneficial to debugging and maintenance.Adopt 555 oscillators to realize the frequency of measured resistance and measured capacitance parameter, Colpitts oscillation circuit has been realized the frequency of tested inductance parameters, sent into the single-chip microcomputer counting by measured frequency by the CD4052 analog switch, carry out the calculating measured parameter by scm software, show again the measured value of measured parameter through display circuit.Program can be used C language online programming, and control starts the corresponding executive routine of measured parameter as the case may be, can control flexibly the gear switch of measured parameter.This utility model can realize the automatic measurement to resistance, inductance and electric capacity, and is practical and convenient.
Description of drawings
Fig. 1 system architecture diagram
Fig. 2 resistance test circuit diagram
Fig. 3 capacitance test circuit figure
Fig. 4 inductance measurement circuit diagram.
Embodiment
Below in conjunction with accompanying drawing the utility model is done specific description.
A kind of LCR measuring instrument as described in Figure 1, comprise metering circuit, control circuit, channel selection circuit and display circuit, described metering circuit comprises 2 capacitance connecting three point type oscillators that are used for measuring 555 multivibrators of electric capacity and resistance and are used for inductance measuring, and the RC oscillating circuit is to utilize 555 oscillatory circuits to realize measured resistance and measured capacitance frequency.Colpitts oscillation circuit is to utilize Colpitts oscillation circuit to realize tested inductance parameters frequency.Automatically identify range by the IO mouth of single-chip microcomputer and switch, realize automatically measuring.
Described control circuit comprises singlechip controller and button selection circuit, it is the single-chip microcomputer of AT89S52 that singlechip controller adopts model, described button selects circuit to comprise a key board unit, be provided with Sr at key board unit, Sc, three buttons of SL can be controlled the switching of different measuring parameter flexibly, realize key measurement.
Described channel selecting comprises a selection analog switch, and the model of analog switch is CD4052, controls by the automatic selection of measured frequency by Single-chip Controlling CD4052 analog switch.
Described display circuit comprises LED lamp and the LED display circuit of 3 different colours.3 kinds of colors are respectively RGB, represent that respectively measuring instrument is in the measuring state of resistance, electric capacity or inductance.3 LED lamps connect in common anode utmost point mode, connect in common anode utmost point mode, and are visual and understandable, operate also simple.The LED display circuit comprises 1 74HC02,2 74LS573,1 2803 driving and 6 charactron, and adopts common anode utmost point mode to connect and compose, and adopts common anode utmost point mode to connect and compose dynamic display part, reduces power consumption.
P1.3 and P1.4 by single-chip microcomputer send two bit address signals to analog switch, obtain corresponding oscillation frequency, then judge whether to change range according to institute's measured frequency, or after data are processed, draw corresponding parameter value, then corresponding numerical value is presented in the display circuit.
The utility model is a kind of LCR automatic measuring instrument, and concrete methods of realizing is as follows:
1. measuring resistance
Timer 555 is a kind of integrated circuit of having many uses, and only needs external a small amount of R, C element, just can consist of multi resonant, monostable and Schmidt trigger." pulse counting method " adopted in the measurement of resistance, by the multi-resonant oscillating circuit that 555 circuit consist of, calculates the size of measured resistance by the frequency of calculating vibration output.As shown in Figure 2, oscillation frequency signal is from the P1.0 mouth of port 3 output access single-chip microcomputers.Single-chip microcomputer can be carried out following computation process by program:
555 are connected into the form of multivibrator, and be its oscillation period
Can be drawn by the computation of Period frequency
(2)
Be that measured resistance is
(3) circuit is divided into 2 grades:
1,100
Rx＜1000 Ω: press resistance test and build Srg, Closing Switch Srd, R2=330 Ω, C2=0.22uF:
(4)
2,1000
Rx＜1M Ω: press resistance test and build Srd, Closing Switch Srg, R1=20K Ω, C3=103pF:
Measurement result can be shown by the single-chip microcomputer display circuit.
2. measurement electric capacity
" pulse counting method " adopted in the measurement of electric capacity equally, by the multi-resonant oscillating circuit that 555 circuit consist of, calculates the size of measured capacitance by the frequency of calculating vibration output.As shown in Figure 3, oscillation frequency signal is from the P1.1 mouth of port 3 output access single-chip microcomputers.Single-chip microcomputer can be carried out following computation process by program:
555 are connected into the form of multivibrator, and be its oscillation period
Circuit arranges R1=R2, can be drawn by the computation of Period frequency
Be that measured capacitance is
(8)
Circuit is divided into 1 grade:
R4=510KΩ,R4=R6；
(9)
Measurement result can be shown by the single-chip microcomputer display circuit.
3. inductance measuring
The measurement of inductance adopts Colpitts oscillation circuit to realize.Colpitts oscillation circuit claims again colpitts oscillation circuit, the bikini oscillatory circuit refers to: two reactance components that link to each other with emitter in the LC loop must be connatural, the another one reactance component is necessary for heterogeneity, and two reactance components that link to each other with emitting stage are all capacitive bikini oscillatory circuit, and the constitution principle of namely " penetrating with base anti-" becomes Colpitts oscillation circuit.As shown in Figure 4, oscillation frequency signal is sinusoidal signal, and this signal is converted to the square wave of same frequency by the Schmidt circuit that is made of 555 chips, from the P1.2 mouth of port 3 output access single-chip microcomputers.Single-chip microcomputer can be carried out following computation process by program:
Its oscillation frequency is
Be that tested inductance is
(11)
Measurement result can be shown by the single-chip microcomputer display circuit.
The utility model adopts single-chip microcomputer can improve the reliability and stability of system, is beneficial to debugging and maintenance.Adopt 555 oscillators to realize the frequency of measured resistance and measured capacitance parameter, Colpitts oscillation circuit has been realized the frequency of tested inductance parameters, sent into the single-chip microcomputer counting by measured frequency by the CD4052 analog switch, carry out the calculating measured parameter by scm software, show again the measured value of measured parameter through display circuit.Program can be used C language online programming, and control starts the corresponding executive routine of measured parameter as the case may be, can control flexibly the gear switch of measured parameter.This utility model can realize the automatic measurement to resistance, inductance and electric capacity, and is practical and convenient.
The above; it only is preferred embodiment of the present utility model; be not to be the restriction of the utility model being made any other form, and according to any modification or equivalent variations that technical spirit of the present utility model is done, still belong to the utility model scope required for protection.
Claims (5)
1. LCR measuring instrument, it is characterized in that: comprise metering circuit, control circuit, channel selection circuit and display circuit, described metering circuit comprises for 555 multivibrators of measuring electric capacity and resistance and is used for the capacitance connecting three point type oscillator of inductance measuring, described control circuit comprises singlechip controller and button selection circuit, described channel selecting comprises a selection analog switch, and described display circuit comprises LED lamp and the LED display circuit of 3 different colours.
2. a kind of LCR measuring instrument according to claim 1 is characterized in that: it is the single-chip microcomputer of AT89S52 that described singlechip controller adopts model.
3. a kind of LCR measuring instrument according to claim 1, it is characterized in that: described 3 LED lamps connect in common anode utmost point mode.
4. a kind of LCR measuring instrument according to claim 1 is characterized in that: described LED display circuit comprises 1 74HC02,2 74LS573, drives and 6 charactrons, and adopt common anode utmost point mode to connect and compose for 1 2803.
5. a kind of LCR measuring instrument according to claim 1, it is characterized in that: the model of described analog switch is CD4052.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220529506 CN202870179U (en) | 2012-10-17 | 2012-10-17 | LCR measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220529506 CN202870179U (en) | 2012-10-17 | 2012-10-17 | LCR measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202870179U true CN202870179U (en) | 2013-04-10 |
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ID=48036888
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220529506 Expired - Fee Related CN202870179U (en) | 2012-10-17 | 2012-10-17 | LCR measuring instrument |
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| CN (1) | CN202870179U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424631A (en) * | 2013-07-12 | 2013-12-04 | 福建二菱电子有限公司 | Intelligent LC meter |
| CN103777082A (en) * | 2014-01-03 | 2014-05-07 | 浙江大学 | Digital display inductance parameter test device |
| CN103954846A (en) * | 2014-05-10 | 2014-07-30 | 张新安 | Wide-range digital capacitance meter |
| CN104007320A (en) * | 2014-06-18 | 2014-08-27 | 张新安 | Digital RLC tester |
| CN104049145A (en) * | 2014-06-28 | 2014-09-17 | 张新安 | Digital resistor-capacitor meter |
| CN104142429A (en) * | 2013-05-09 | 2014-11-12 | 海洋王（东莞）照明科技有限公司 | Resistor resistance value estimating device and control circuit thereof |
| CN104729541A (en) * | 2015-01-28 | 2015-06-24 | 上海兰宝传感科技股份有限公司 | Intelligent induction type sensor |
| CN106841819A (en) * | 2017-03-14 | 2017-06-13 | 南宁市高光信息技术有限公司 | A kind of capacitor and inductance measurement system |
| CN109444588A (en) * | 2018-11-15 | 2019-03-08 | 东南大学 | A kind of LCR measuring system based on FPGA+DDS+PLL |
| CN110308335A (en) * | 2019-07-08 | 2019-10-08 | 中国科学院合肥物质科学研究院 | It is a kind of to exchange the resistance sense parameter measuring apparatus of magnet coil, method and system |
-
2012
- 2012-10-17 CN CN 201220529506 patent/CN202870179U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142429A (en) * | 2013-05-09 | 2014-11-12 | 海洋王（东莞）照明科技有限公司 | Resistor resistance value estimating device and control circuit thereof |
| CN103424631A (en) * | 2013-07-12 | 2013-12-04 | 福建二菱电子有限公司 | Intelligent LC meter |
| CN103777082A (en) * | 2014-01-03 | 2014-05-07 | 浙江大学 | Digital display inductance parameter test device |
| CN103954846A (en) * | 2014-05-10 | 2014-07-30 | 张新安 | Wide-range digital capacitance meter |
| CN104007320A (en) * | 2014-06-18 | 2014-08-27 | 张新安 | Digital RLC tester |
| CN104049145A (en) * | 2014-06-28 | 2014-09-17 | 张新安 | Digital resistor-capacitor meter |
| CN104729541A (en) * | 2015-01-28 | 2015-06-24 | 上海兰宝传感科技股份有限公司 | Intelligent induction type sensor |
| CN106841819A (en) * | 2017-03-14 | 2017-06-13 | 南宁市高光信息技术有限公司 | A kind of capacitor and inductance measurement system |
| CN109444588A (en) * | 2018-11-15 | 2019-03-08 | 东南大学 | A kind of LCR measuring system based on FPGA+DDS+PLL |
| CN110308335A (en) * | 2019-07-08 | 2019-10-08 | 中国科学院合肥物质科学研究院 | It is a kind of to exchange the resistance sense parameter measuring apparatus of magnet coil, method and system |
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| 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: 20130410 Termination date: 20141017 |
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| EXPY | Termination of patent right or utility model |