CN201837683U - High-precision alternating-current impedance testing device - Google Patents
High-precision alternating-current impedance testing device Download PDFInfo
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- CN201837683U CN201837683U CN2010205976883U CN201020597688U CN201837683U CN 201837683 U CN201837683 U CN 201837683U CN 2010205976883 U CN2010205976883 U CN 2010205976883U CN 201020597688 U CN201020597688 U CN 201020597688U CN 201837683 U CN201837683 U CN 201837683U
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Abstract
A high-precision alternating-current impedance testing device comprises a microprocessor which is connected with a sine-wave generator, a man-machine interactive device, a display device, an external communication interface, a standard resistance output circuit and a tested resistance output circuit; the standard resistance output circuit comprises a standard alternating-current resistor, a first program-control alternating-current amplifier, a first phase sensitive detector and a first A/D (analog to digital) converter; a tested resistance output circuit comprises a tested alternating-current resistor, a second program-control alternating-current amplifier, a second phase sensitive detector and a second A/D converter; the microprocessor controls the standard resistor and the tested resistor by two program-control switches, and controls the two program-control alternating-current amplifiers and the two phase sensitive detectors; the standard resistor is connected with the tested resistor in series, and the output ends of the two A/D converters are respectively output to the microprocessor. In the high-precision alternating-current impedance testing device, the high-precision alternating-current impedance testing device utilizes the phase shift principle, and has the advantages that the precision is high, the measuring speed is fast, the operation is convenient, and four-line measurement and communication output can be conducted.
Description
Technical field
The utility model relates to the measurement applied technical field, specifically is a kind of high-precision AC impedance test device.
Background technology
At present, existing AC impedance automatic measuring equipment has many models and classification in the domestic and international market, and its ultimate principle can be divided into program controlled inductive potential divider formula automatic bridge, two sinusoidal ratio power supply formula automatic bridge, voltage vector rule of three RLC digital electric bridge etc.The equipment characteristic difference of these three kinds of principles respectively has drawback.
Program controlled inductive potential divider formula automatic bridge belongs to the traditional mode measuring bridge, and its principle is the same with transformer ratio arms electrical bridge principle, has just adopted automatic technology at zero indicator and ratio adjusting part.This kind electric bridge is applicable to the comparison of similar impedance, and to the comparison of heterogeneity impedance, its circuit is comparatively complicated, owing to adopt induction coupling spare, the spuious magnetic-coupled influence of electric bridge is bigger, is difficult for carrying out precision control.
The characteristics of two sinusoidal ratio power supply formula automatic bridges are that test speed is fast, but used device is more, the cost height.Because its equilibrium point has only one, the two ends test that suitable impedance is bigger can not realize the four terminal impedances measurement that impedance is less simultaneously.
The advantage of voltage vector rule of three RLC digital electric bridge is that automatic test speed is fast, basically there is not equilibrium process, but the momentary fluctuation meeting of power supply amplitude influences measurement result, and because biproduct somatotype A/D generally is three, four and half, the highest by five and half, so the AC impedance full accuracy is generally 2/10000ths.
Summary of the invention
At the problems referred to above, the utility model provides the novel ac impedance measurement device that a kind of precision height, measuring speed that utilizes the phase-shifting method principle to realize is fast, easy to operate, can carry out measurement of four lines and communication output.
A kind of high-precision AC impedance test device, utilize sinusoidal wave synthetic technology, digit phase authentication technique, AC amplifier technology, adopt phase-shifting method to measure AC resistance, comprise: a microprocessor, microprocessor are connected with sine-wave generator, human-computer interaction device, display device, external communication interface, measuring resistance output circuit and measured resistance output circuit; The measuring resistance output circuit comprises standard electric alternating current resistance device, the first program control AC amplifier, first phase-sensitive detector (PSD), first A/D converter that connects successively; The measured resistance output circuit comprises tested AC resistance, the second program control AC amplifier, second phase-sensitive detector (PSD), second A/D converter that connects successively; Microprocessor is respectively by two programmed switch control criterion resistors and measured resistance, microprocessor is controlled two program control AC amplifier and two phase-sensitive detector (PSD)s respectively, calibration resistor and measured resistance are connected in series, and the output terminal of two A/D converters outputs to microprocessor respectively.Microprocessor control sine-wave generator is set clock frequency and phase increment data, it is zero low noise sine wave AC voltage that sine-wave generator produces initial phase, this alternating voltage produces standard electric alternating current stream, produces tested alternating current by tested AC resistance by standard electric alternating current resistance device, needs microprocessor to select the enlargement factor of suitable standard electric alternating current resistance and suitable AC amplifier in advance by programmed switch; By measuring resistance output circuit and measured resistance output circuit independent processing two paths of data, finally be transferred to microprocessor by A/D converter respectively, microprocessor carries out data operation and processing, finally shows measurement result.Realize functions such as self-poise, automatic control, calculating automatically, numeral demonstration and automated communications, reached the purpose of high-acruracy survey.
Preferably, above-mentioned phase-sensitive detector (PSD) comprises first phase-sensitive detector (PSD) and second phase-sensitive detector (PSD), and this is the division on the function, and actually can adopt one or more phase-sensitive detector (PSD)s, is to realize easily for present digit phase authentication technique; Above-mentioned A/D converter comprises first A/D converter and second A/D converter, and this is the division on the function, and actually can adopt one or more A/D converters, and this is to realize easily for existing A/D switch technology.
Preferably, between described first phase-sensitive detector (PSD) and first A/D converter, be respectively arranged with direct current amplifier between second phase-sensitive detector (PSD) and second A/D converter.Direct current amplifier makes the direct current signal of phase-sensitive detector (PSD) output arrive A/D converter through amplifying the back.
Preferably, described sine-wave generator and A/D converter are connected with the DC reference voltage source respectively.Described sine-wave generator is a low noise digital synthesis sine generator.
Preferably, described human-computer interaction device is a keyboard.External communication interface is existing common interfaces such as serial ports, parallel port, is convenient to communication.
Preferably, between the described standard electric alternating current resistance device and the first program control AC amplifier, be respectively arranged with the shielding equipotential between the tested AC resistance and the second program control AC amplifier and produce circuit.
The high-precision AC impedance test device that the utility model provides has following advantage: utilize the sinusoidal wave synthetic technology of low noise digital, digit phase authentication technique, low noise to exchange realizations such as amplifying technique, A/D switch technology, be not subject to external interference, measuring accuracy height, speed are fast, can carry out multi-thread measurement, be provided with communication interface, be convenient to carry out communication.
Description of drawings
Fig. 1 is an electrical schematic diagram of the present utility model.
Embodiment
Embodiment with indefiniteness further explains, illustrates the technical program below.
A kind of high-precision AC impedance test device, as shown in Figure 1, comprise: a microprocessor, microprocessor is set to comprise CPU1 and CPU2, CPU1 is connected to the DDS sine-wave generator by photoelectric isolation module, CPU1 is connected respectively to external communication interface, display device, button, and CPU1 also is connected to measuring resistance output circuit and measured resistance output circuit by photoelectric isolation module respectively.The measuring resistance output circuit comprises that the standard electric alternating current resistance Zn, low loss switching matrix, the shielding equipotential that connect successively produce circuit, programmable amplifier, phase-sensitive detector (PSD), A/D converter; The measured resistance output circuit comprises that the tested AC resistance Zx, the shielding equipotential that connect successively produce circuit, programmable amplifier, phase-sensitive detector (PSD), A/D converter; CPU1 is respectively by two programmed switch control criterion resistance Zn and measured resistance Zx, CPU1 also controls the work of two program control AC amplifier and two phase-sensitive detector (PSD)s respectively, calibration resistor and measured resistance are connected in series, and the output terminal of two A/D converters outputs to CPU2 by photoelectric isolation module respectively.
CPU1 sets range, and control low loss switching matrix selects to settle the standard AC resistance Zn, selects the input and the enlargement factor of programmable amplifier; CPU1 sets test frequency, control DDS produces the sine voltage Un of corresponding frequencies, it is applied in Zn and the Zx series loop, by programmable amplifier, phase-sensitive detector (PSD) and A/D converter two independent metering circuit, the alternating voltage at difference measurement standard AC resistance and tested AC resistance two ends.And the CPU2 automatically-controlled continuous and the data of gathering two A/D converters, and giving CPU1 by internal interface, CPU1 carries out data operation and processing, shows measurement result in display device.Realize functions such as self-poise, automatic control, calculating automatically, numeral demonstration and automated communications, reached the purpose of high-acruracy survey.
Claims (6)
1. high-precision AC impedance test device, it is characterized in that comprising: a microprocessor, microprocessor are connected with sine-wave generator, human-computer interaction device, display device, external communication interface, measuring resistance output circuit and measured resistance output circuit; The measuring resistance output circuit comprises standard electric alternating current resistance device, the first program control AC amplifier, first phase-sensitive detector (PSD), first A/D converter that connects successively; The measured resistance output circuit comprises tested AC resistance, the second program control AC amplifier, second phase-sensitive detector (PSD), second A/D converter that connects successively; Microprocessor is respectively by two programmed switch control criterion resistors and measured resistance, microprocessor is controlled two program control AC amplifier and two phase-sensitive detector (PSD)s respectively, calibration resistor and measured resistance are connected in series, and the output terminal of two A/D converters outputs to microprocessor respectively.
2. high-precision AC impedance test device according to claim 1 is characterized in that: between described first phase-sensitive detector (PSD) and first A/D converter, be respectively arranged with direct current amplifier between second phase-sensitive detector (PSD) and second A/D converter.
3. high-precision AC impedance test device according to claim 1 and 2 is characterized in that: described sine-wave generator and A/D converter are connected with the DC reference voltage source respectively.
4. high-precision AC impedance test device according to claim 1 is characterized in that: described human-computer interaction device is a keyboard.
5. high-precision AC impedance test device according to claim 1 is characterized in that: between the described standard electric alternating current resistance device and the first program control AC amplifier, be respectively arranged with the shielding equipotential between tested AC resistance and the second program control AC amplifier and produce circuit.
6. high-precision AC impedance test device according to claim 1 is characterized in that: described sine-wave generator is a low noise digital synthesis sine generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205976883U CN201837683U (en) | 2010-11-09 | 2010-11-09 | High-precision alternating-current impedance testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205976883U CN201837683U (en) | 2010-11-09 | 2010-11-09 | High-precision alternating-current impedance testing device |
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| CN201837683U true CN201837683U (en) | 2011-05-18 |
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| CN2010205976883U Expired - Fee Related CN201837683U (en) | 2010-11-09 | 2010-11-09 | High-precision alternating-current impedance testing device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608425A (en) * | 2012-03-26 | 2012-07-25 | 中国科学院物理研究所 | Broadband impedance measuring system and broadband impedance measuring method |
| CN103439557A (en) * | 2013-09-09 | 2013-12-11 | 哈尔滨天华宏达能源技术开发有限公司 | Bridge arm digital bridge with variable phase difference |
| CN103809028A (en) * | 2012-11-14 | 2014-05-21 | 罗伯特·博世有限公司 | Measuring circuit for determining resistance value of sensor resistor element |
| CN105044465A (en) * | 2015-07-10 | 2015-11-11 | 厦门大学 | Automatic balance bridge based on synchronous clock DDS and method for measuring impedance of DUT (Device Under Test) |
| CN108627701A (en) * | 2017-03-15 | 2018-10-09 | 上海骐宏电驱动科技有限公司 | Resistance measurement system and resistance measuring equipment |
| CN109061311A (en) * | 2018-09-10 | 2018-12-21 | 哈尔滨理工大学 | A kind of conductor AC resistance automatic testing equipment based on FPGA with stream than device electric bridge |
| CN109342820A (en) * | 2018-11-23 | 2019-02-15 | 南京理工大学 | A kind of contact impedance test macro |
| CN109581067A (en) * | 2018-11-09 | 2019-04-05 | 电子科技大学 | A kind of capacitance measuring device based on FPGA speed receiver |
| CN113075456A (en) * | 2021-03-18 | 2021-07-06 | 常州同惠电子股份有限公司 | High-precision alternating-current impedance testing system and testing method thereof |
-
2010
- 2010-11-09 CN CN2010205976883U patent/CN201837683U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608425A (en) * | 2012-03-26 | 2012-07-25 | 中国科学院物理研究所 | Broadband impedance measuring system and broadband impedance measuring method |
| CN102608425B (en) * | 2012-03-26 | 2015-04-22 | 中国科学院物理研究所 | Broadband impedance measuring system and broadband impedance measuring method |
| CN103809028A (en) * | 2012-11-14 | 2014-05-21 | 罗伯特·博世有限公司 | Measuring circuit for determining resistance value of sensor resistor element |
| CN103439557A (en) * | 2013-09-09 | 2013-12-11 | 哈尔滨天华宏达能源技术开发有限公司 | Bridge arm digital bridge with variable phase difference |
| CN105044465A (en) * | 2015-07-10 | 2015-11-11 | 厦门大学 | Automatic balance bridge based on synchronous clock DDS and method for measuring impedance of DUT (Device Under Test) |
| CN105044465B (en) * | 2015-07-10 | 2018-01-02 | 厦门大学 | The method of autobalance bridge and measurement DUT impedances based on the double DDS of synchronised clock |
| CN108627701A (en) * | 2017-03-15 | 2018-10-09 | 上海骐宏电驱动科技有限公司 | Resistance measurement system and resistance measuring equipment |
| CN109061311A (en) * | 2018-09-10 | 2018-12-21 | 哈尔滨理工大学 | A kind of conductor AC resistance automatic testing equipment based on FPGA with stream than device electric bridge |
| CN109581067A (en) * | 2018-11-09 | 2019-04-05 | 电子科技大学 | A kind of capacitance measuring device based on FPGA speed receiver |
| CN109342820A (en) * | 2018-11-23 | 2019-02-15 | 南京理工大学 | A kind of contact impedance test macro |
| CN113075456A (en) * | 2021-03-18 | 2021-07-06 | 常州同惠电子股份有限公司 | High-precision alternating-current impedance testing system and testing method thereof |
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Legal Events
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110518 Termination date: 20161109 |