CN86206128U - In-circuit capacitance testor - Google Patents
In-circuit capacitance testor Download PDFInfo
- Publication number
- CN86206128U CN86206128U CN 86206128 CN86206128U CN86206128U CN 86206128 U CN86206128 U CN 86206128U CN 86206128 CN86206128 CN 86206128 CN 86206128 U CN86206128 U CN 86206128U CN 86206128 U CN86206128 U CN 86206128U
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- CN
- China
- Prior art keywords
- microfarad
- capacitance
- amplifier
- shelves
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model belongs to a capacitance tester; the purpose is to provide a tester which can conveniently test the capacitance on line to enhance speed determination of the capacitance failure. The utility model comprises an oscillator [1], a constant voltage amplifier [2], a testing proportional amplifier [4], and an AC voltmeter indicating device [5]. The testing range is from 1 microfarad to 500 microfarad; changing correction point can expand the measuring range to 2500 microfarad. The utility model has the advantages of simple structure, low cost, small size, and accuracy.
Description
The utility model belongs to the measuring instrument of electric capacity.
Existing capacitance meter instruments and meters though be that precision is higher when surveying capacity cell separately, when electric capacity connects, has the influence of the elements such as diode, triode and resistance that are connected with capacitor in circuit, can not measure capacitance value truly.Because the large percentage that capacitor is occupied in circuit, and failure rate is higher, if adopt common instrument detecting, just can't get rid of and the influencing each other of electric capacity associated components, can not judge the fault of capacitor, have to check judgement, burn-on under the weldering like this under the condenser welding, artificial lines that cause wiring board and element damage in various degree, and the serviceable life that has prolonged servicing time and reduced equipment.
The purpose of this utility model provides a kind ofly can carry out the electric capacity on-line measurement easily, improves the detecting instrument of electric capacity fault judgement speed.
Description of drawings:
Fig. 1 is the circuitry block scheme of electric capacity on-line testing device.
(1) is oscillator among the figure, and (2) are constant-voltage amplifier, and (3) are measured capacitance CX, and (4) are the measurement scale amplifier, and (5) are the A.C. voltmeter indicator.
Fig. 2 is the circuitry schematic diagram of electric capacity on-line testing device.
IC among the figure
1~IC
4Be integrated amplifier, μ A is a reometer, BG
3, BG
7Be field effect transistor, BG
1, BG
2, BG
4~BG
6Be diode, C
23~C
25Be standard capacitance, R
22~R
24For adjusting resistance.
The utility model is made up of four parts such as oscillator (1), constant-voltage amplifier (2), measurement scale amplifier (4), A.C. voltmeter indicators (5). Measured capacitance CXAs input capacitance, one terminates at the output of constant-voltage amplifier (2), and the other end is connected on the IC of measurement scale amplifier (4)3Inverting input, standard capacitance C23(or C24、C
25) as IC3Negative-feedback electric capacity consist of measurement scale amplifier (4), the ac voltage signal of its output detections and measured capacitance CXCapacitance be directly proportional, this signal is delivered to the IC of A.C. voltmeter indicator (5)4Input, its output is presented on the indicator by 1:1 by ammeter. Measurement category is divided third gear in 1 microfarad~500 microfarads, each is measured shelves and has selected respectively different frequency, the selected of its frequency determined by RC frequency-selective network in the oscillator (1), and when 500 microfarad shelves are that 60 hertz, 100 microfarad shelves are 200 hertz, 10 microfarad shelves are 1300 hertz. But change the check point expanded range to 2500(1~2500) microfarad. The IC of measurement scale amplifier (4)3Output is connected to and measures corresponding three the adjusting resistance (R of class22~R
24), to (4) three three standard capacitance (C that measure class of measurement scale amplifier23~C
24), compensate adjustment. Measured capacitance CXA, B two point measurement voltages far below the valve voltage of diode, be 75~80 millivolts, in order to guarantee thoroughly to get rid of be parallel to the measured capacitance two ends the elements such as diode to measuring the impact that causes.
The obtained effect of the utility model compared with prior art, can make things convenient for online rapidly open circuit, short circuit and the volume change situation of measuring electric capacity, have simultaneously simple in structure, cost is low, volume is little, advantage such as accurate, use on-line testing device can improve the maintenance efficiency of equipment, prolongs the serviceable life of equipment.Can find in time that by checking some had lost efficacy but also do not reach the obvious rotten capacity cell that influences the line work performance, and to get rid of these potential failure factors, to make owing to the capacity cell equipment failure rate that causes that goes wrong reduces greatly.
Specific embodiment of the utility model is as follows: referring to Fig. 2.Among the figure with IC
1For main element constitutes oscillator (1), wherein C
5, C
6, R
6, R
7The RC circuit of decision oscillation frequency when being 500 microfarad shelves, the corresponding C that is respectively of 100 microfarad shelves with 10 microfarad shelves
7, C
8, R
9, R
10And C
9, C
10, R
12, R
13, resistance R
8, R
11, R
14Be respectively the adjustment resistance of each grade leveling oscillating voltage.K among the figure
10, K
20, K
30, K
40The position, the state when being 500 microfarads and measuring shelves.During oscillator work, by C
5, C
6, R
6, R
7The oscillation frequency voltage of decision is through R
8, K
11, K
10, C
4, R
3Be connected to IC
1In-phase input end feeds back to C again through output terminal 8 after amplifying
5, C
6, R
6, R
7The RC circuit of forming forms the positive feedback vibration, and the vibration output voltage has one the tunnel in addition through IC
18 ends, C
2To BG
1, BG
2Be that a negative dc pulse voltage adds to R after the rectification
1, C
1After two ends filter Alternating Component, arrive BG again
3Grid, make BG
3Working current reduce, internal resistance strengthens, because BG
3Source (S) leak (D) the two poles of the earth through C
3Be connected to IC
1Inverting input 13, BG
3Source-drain electrode between the result that strengthens of resistance, make IC
1Vibration can infinitely not raise, and only can be stabilized on the suitable value, make IC
1Stable low-distortion sine wave signal of 8 ends output.IC
1Ac output voltage after full scale is adjusted potentiometer W dividing potential drop, be added to IC
2In-phase input end 1.
With IC
2Be the constant-voltage amplifier (2) of main element formation, because IC
2Output terminal 8 directly be linked to be full negative-feedback circuit, IC with inverting input 13
2Output voltage identical with input voltage, and output impedance is lower, has adopted like this to have to do to measure than the AC signal of low output impedance and has used signal source.IC
2The constant voltage AC signal one road to K of 8 ends output
42Usefulness during as the alignment full scale, another road is to external measurement terminal A, through measured capacitance C
XTo external pelivimetry connection terminal B is entered IC again
3Inverting input 13.
With IC
3What constitute for main element is measurement scale amplifier (4), and its output terminal 8 is through C
23(or C
24, C
25), K
21(or K
22, K
23), K
20To inverting input 13, constitute negative-feedback amplifier, IC like this
2The alternating voltage of output terminal 8 is through measured capacitance C
XTo IC
3Input end 13, formed electric current is through C
23(or C
24, C
25) by IC
38 ends absorb, make IC
3The output end voltage signal is directly proportional with the capacity of CX.
With IC
4Be the A.C. voltmeter indicator (5) that main element constitutes, its input end is connected on IC
3Output terminal 8, measurement result is reflected on the gauge outfit indicator, pointed numerical value is the capability value of Cx, the K in this circuit part
40With K
41Join and be measurement state, K
40With K
42Joining is correcting state, and tested voltage is by K
40Through R
25, C
31Enter IC
4In-phase input end 3 is exaggerated the back from output terminal 6 outputs, through C
33C
34, BG
4, BG
6Arrive the microampere meter gauge outfit after the rectification, and to IC
4Inverting input 2, form negative feedback, when the DC voltage after the rectification during much larger than gauge outfit full scale voltage, BG
5The conducting shunting is with the anti-tamper microampere meter.During operate as normal, BG
5Be open-circuit condition, do not influence indicated value.R
26Be the negative feedback divider resistance, change R
26Can adjust the sensitivity of electronic alternating-current voltmeter.BG is set
7Be to constitute current source loads.
This tester is nonpolarity measurement, only connects arbitrarily the measured capacitance two ends namely with two slotted lines Readable. Compare with the electric capacity nominal value when very little when the measured capacitance reading value, measured capacitance lost efficacy, on the contrary exceed nominal value so that each grade all beyond full scale, and external circuit is not when having other short trouble, measured capacitance is punch through damage.
IC among the figure1~IC
3Model is BH7331, IC4Model is 8FC7, BG1、BG
2、BG
4、BG
6Model is 2AK10, BG5Model is 2CP9, BG3、BG
7Model is 3DJ6E, and gauge outfit is 59C5 type 50 μ A, and W is potentiometer, and R is resistance, and C is electric capacity, and K switch adopts the KZJ-5 type.
Claims (4)
1, a kind of electric capacity on-line testing device is characterized in that it is by oscillator [1], constant-voltage amplifier [2], measurement scale amplifier [4], the quaternaries such as [5] of A.C. voltmeter indicator; Measured capacitance Cx is as input capacitance, and one terminates at the output terminal of constant-voltage amplifier [2], and the other end is connected on the IC of measurement scale amplifier [4]
3Inverting input, standard capacitance C
23(or C
24, C
25) as IC
3Negative feedback electric capacity constitute measurement scale amplifier [4], ac voltage signal that its output detects and the electric capacity of measured capacitance Cx were presented on the indicator by 1: 1.
2, according to the described tester of claim 1, it is characterized in that measurement range is at 1 microfarad~500 microfarad steppings, each is measured shelves and has selected different frequency respectively for use, the selected of its frequency determined by RC frequency selection network in the oscillator (1), 500 microfarad shelves are 60 hertz, 100 microfarad shelves are 200 hertz, and 10 microfarad shelves are 1300 hertz, but change the check point expanded range to 2500 microfarads.
3,, it is characterized in that the IC of measurement scale amplifier (4) according to the described tester of claim 1
3Output terminal is connected to and measures corresponding three of class and adjusts resistance (R
22-R
24), to (4) three three standard capacitance (C that measure class of measurement scale amplifier
23~C
25) compensate adjustment.
4, according to the described tester of claim 1, it is characterized in that the A, B two point measurement voltages of measured capacitance CX valve voltage far below diode, be 75~80 millivolts.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 86206128 CN86206128U (en) | 1986-08-19 | 1986-08-19 | In-circuit capacitance testor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 86206128 CN86206128U (en) | 1986-08-19 | 1986-08-19 | In-circuit capacitance testor |
Publications (1)
Publication Number | Publication Date |
---|---|
CN86206128U true CN86206128U (en) | 1987-05-27 |
Family
ID=4808833
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 86206128 Ceased CN86206128U (en) | 1986-08-19 | 1986-08-19 | In-circuit capacitance testor |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN86206128U (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102023260A (en) * | 2009-09-18 | 2011-04-20 | Abb技术有限公司 | Method, capacitance meter, computer program and computer program product for improved capacitance measurement |
CN102023261A (en) * | 2009-09-18 | 2011-04-20 | Abb技术有限公司 | Capacitance meter, method, and computer program product for improved capacitance measurement |
CN101714821B (en) * | 2009-12-18 | 2011-09-28 | 哈尔滨工业大学 | Excitation power circuit of rotary transformer |
CN102263539A (en) * | 2010-05-28 | 2011-11-30 | 洛克威尔自动控制技术股份有限公司 | Variable frequency drive and methods for filter capacitor fault detection |
CN102495308A (en) * | 2011-11-28 | 2012-06-13 | 苏州科技学院 | Farad capacitor driving capability detection apparatus |
CN104515968A (en) * | 2014-12-25 | 2015-04-15 | 贵州航天计量测试技术研究所 | Calibration device for capacitor instant open/short circuit tester and calibration method |
CN106885948A (en) * | 2017-03-02 | 2017-06-23 | 广东工业大学 | A kind of laser Height-adjusting device capacitance measuring device |
CN109342823A (en) * | 2018-09-29 | 2019-02-15 | 北京长城华冠汽车科技股份有限公司 | Measuring circuit, control method and the electric car of Y capacitance |
CN110865107A (en) * | 2019-12-25 | 2020-03-06 | 广州商辉仪业智能科技股份有限公司 | Expander for redox electrode range |
CN113125926A (en) * | 2021-04-08 | 2021-07-16 | 中山大学 | Synchronous measurement system and method for array precision capacitor with adjustable bias voltage |
-
1986
- 1986-08-19 CN CN 86206128 patent/CN86206128U/en not_active Ceased
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8917102B2 (en) | 2009-09-18 | 2014-12-23 | Abb Technology Ag | Method, capacitance meter, computer program and computer program product for improved capacitance measurement |
CN102023261A (en) * | 2009-09-18 | 2011-04-20 | Abb技术有限公司 | Capacitance meter, method, and computer program product for improved capacitance measurement |
CN102023260A (en) * | 2009-09-18 | 2011-04-20 | Abb技术有限公司 | Method, capacitance meter, computer program and computer program product for improved capacitance measurement |
CN101714821B (en) * | 2009-12-18 | 2011-09-28 | 哈尔滨工业大学 | Excitation power circuit of rotary transformer |
CN102263539A (en) * | 2010-05-28 | 2011-11-30 | 洛克威尔自动控制技术股份有限公司 | Variable frequency drive and methods for filter capacitor fault detection |
CN102263539B (en) * | 2010-05-28 | 2014-09-10 | 洛克威尔自动控制技术股份有限公司 | Variable frequency drive and methods for filter capacitor fault detection |
CN102495308A (en) * | 2011-11-28 | 2012-06-13 | 苏州科技学院 | Farad capacitor driving capability detection apparatus |
CN104515968A (en) * | 2014-12-25 | 2015-04-15 | 贵州航天计量测试技术研究所 | Calibration device for capacitor instant open/short circuit tester and calibration method |
CN104515968B (en) * | 2014-12-25 | 2017-08-01 | 贵州航天计量测试技术研究所 | A kind of capacitor moment open-short circuit tester calibrating installation and calibration method |
CN106885948A (en) * | 2017-03-02 | 2017-06-23 | 广东工业大学 | A kind of laser Height-adjusting device capacitance measuring device |
CN106885948B (en) * | 2017-03-02 | 2019-05-07 | 广东工业大学 | A kind of laser Height-adjusting device capacitance measuring device |
CN109342823A (en) * | 2018-09-29 | 2019-02-15 | 北京长城华冠汽车科技股份有限公司 | Measuring circuit, control method and the electric car of Y capacitance |
CN109342823B (en) * | 2018-09-29 | 2020-12-01 | 北京长城华冠汽车科技股份有限公司 | Measuring circuit and control method of Y capacitor and electric automobile |
CN110865107A (en) * | 2019-12-25 | 2020-03-06 | 广州商辉仪业智能科技股份有限公司 | Expander for redox electrode range |
CN113125926A (en) * | 2021-04-08 | 2021-07-16 | 中山大学 | Synchronous measurement system and method for array precision capacitor with adjustable bias voltage |
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C06 | Publication | ||
PB01 | Publication | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C17 | Cessation of patent right | ||
CE01 | Termination of patent right |