CN202720291U - Capacitance tester - Google Patents
Capacitance tester Download PDFInfo
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- CN202720291U CN202720291U CN 201220406967 CN201220406967U CN202720291U CN 202720291 U CN202720291 U CN 202720291U CN 201220406967 CN201220406967 CN 201220406967 CN 201220406967 U CN201220406967 U CN 201220406967U CN 202720291 U CN202720291 U CN 202720291U
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- triode
- led
- measuring set
- connector lug
- capacity measuring
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Abstract
The utility model discloses a capacitance tester. The capacitance tester comprises a capacitance tester shell, a mainboard circuit arranged in the capacitance tester shell and a connector lug arranged on a sidewall of the capacitance tester shell. The mainboard circuit comprises a direct-current power supply V1, a Darlington composite amplifier tube circuit and a light emitting diode LED1. An anode of the direct-current power supply V1 is connected with the light emitting diode LED1 and then is connected with the connector lug. A cathode is connected with the Darlington composite amplifier tube circuit. And the Darlington composite amplifier tube circuit is connected with the connector lug and simultaneously is connected with the light emitting diode LED1. The structure of the tester is simple and cost is low. The tester possesses a rapid detection function to a small capacitance.
Description
Technical field
The utility model relates to the proving installation of electric capacity, namely specifically be utilize multistage amplification characteristic with capacitor charging after again discharge examination, i.e. capacity measuring set.
Background technology
Electric capacity (Capacitance) also is called " electric capacity ", refers to the electric charge reserves under given potential difference (PD), is designated as C, and international unit is farad (F).In general, electric charge can be stressed in electric field and move, and medium has been arranged between conductor, hindered then that electric charge moves and so that charge accumulation on conductor, causes the accumulation storage of electric charge, the quantity of electric charge of storage then is called electric capacity.Because electric capacity is one of a large amount of electronic components that use in the electronic equipment, so be widely used in every aspects such as straight, coupling, bypass, filtering, resonant tank, energy conversion, control circuits.
The classification of electric capacity has a lot; amount of capacity according to electric capacity; can be divided into large electric capacity and little electric capacity; because the size of little electric capacity is small-sized; in detection, be not easy very much operation; and no matter be how electric capacity manufacturer or circuit board making merchant be where; or in the later period maintenance operation; whether Detection capacitance can work is a very important job, and the application of electric capacity in circuit usually can cause punch through damage; will change whole circuit board iff the damage because of an electric capacity; that cost will increase greatly, and be seldom as the equipment of the quality of Detection capacitance, and the detection of little electric capacity then is the most difficult detection.
The utility model content
The purpose of this utility model is to provide capacity measuring set, and this apparatus structure is simple, and cost is low, possesses the fast detecting function to little electric capacity.
Implementation of the present utility model is as follows: capacity measuring set, comprise the capacity measuring set housing, and the motherboard circuit that is arranged on the capacity measuring set enclosure interior, and the connector lug that is arranged on the capacity measuring set housing sidewall, described motherboard circuit comprises direct supply V1, and Darlington compositing amplification tube circuit, and LED 1, after being connected with LED 1, the positive pole of described direct supply V1 is connected with connector lug, its negative pole is connected with Darlington compositing amplification tube circuit, and Darlington compositing amplification tube circuit also is connected with LED 1 when being connected with connector lug.
Described Darlington compositing amplification tube circuit is made of triode Q1 and the triode Q2 of series connection, the E utmost point of described triode Q2 is connected with the negative pole of direct supply V1, the B utmost point of triode Q1 is connected with connector lug, and the C utmost point of triode Q1 is connected C and extremely all is connected with LED 1 with triode Q2.
Described connector lug is connected with red test pencil and black meter pen.
Dry cell or lithium battery that described direct supply V1 is 3V.
Triode Q1 selects 9014 type silicon NPN triodes, requires its enlargement factor B 〉=220, and triode Q2 selects 9013 type silicon NPN triodes, requires its enlargement factor B 〉=100.
Circuit working principle of the present utility model is: utilize lumination of light emitting diode whether to judge the quality of small capacitor.
Triode Q1 and triode Q2 form Darlington compositing amplification tube circuit, and it has high enlargement factor.When red, black two test pencils of tester contact the small capacitor two ends, the one charging current testing capacitor of flowing through is just arranged, although this charging current is very small, amplifies metapedes through the Darlington compositing amplification tube circuit of high-amplification-factor and can drive luminotron LED and light luminous.If LED is not luminous, the expression capacitor illustrates that without charging ability inner broken string damages.
It is better little that triode pipe Q1 and triode Q2 two pipes all require penetrating current to heal.The LED red light emitting diodes is if can use high brightness LED then better.
The test pencil that red, black two test pencils can adopt common universal electric meter to use.
Because this tester when not using, is not consume electric energy, so tester needn't arrange power switch.
During use, only need the two ends with red, black two test pencils while contact measured capacitor, luminotron LED should be once glittering, then extinguishes, and the expression capacitor is intact.
If LED is not glittering, expression capacitor internal broken string damages; If the glittering rear luminosity of LED only is dimmed rather than extinguishes, expression capacitor internal existence electric leakage; If LED Chang Liang does not put out, the expression capacitor internal is Damage by Short Circuit.
Because this tester has higher measurement sensitivity, it is suitable for test capacity below 0.1 μ F, the various little electric capacity that tens methods (pF) are above.When test, the staff two ends do not contact metal part red, black meter pen simultaneously, otherwise the affiliation that adds of human body resistance makes LED send out all the time the low light level, makes you think that capacitor has electric leakage by mistake.
This tester can also as logical table, can check the break-make situation of circuit according to the luminous situation of LED except the quality of differentiating small capacitor, also can differentiate the quality of PN junction in diode, the triode.
The utility model has the advantage of: this apparatus structure is simple, and cost is low, possesses the fast detecting function to little electric capacity.
Description of drawings
Fig. 1 is the utility model structural representation.
Embodiment
Embodiment one
As shown in Figure 1.
Capacity measuring set, comprise capacity measuring set housing and the connector lug that is arranged on the motherboard circuit of capacity measuring set enclosure interior and is arranged on the capacity measuring set housing sidewall, described motherboard circuit comprises direct supply V1 and Darlington compositing amplification tube circuit and LED 1, after being connected with LED 1, the positive pole of described direct supply V1 is connected with connector lug, its negative pole is connected with Darlington compositing amplification tube circuit, and Darlington compositing amplification tube circuit also is connected with LED 1 when being connected with connector lug.
Described Darlington compositing amplification tube circuit is made of triode Q1 and the triode Q2 of series connection, the E utmost point of described triode Q2 is connected with the negative pole of direct supply V1, the B utmost point of triode Q1 is connected with connector lug, and the C utmost point of triode Q1 is connected C and extremely all is connected with LED 1 with triode Q2.
Described connector lug is connected with red test pencil and black meter pen.
Dry cell or lithium battery that described direct supply V1 is 3V.
Triode Q1 selects 9014 type silicon NPN triodes, requires its enlargement factor B 〉=220, and triode Q2 selects 9013 type silicon NPN triodes, requires its enlargement factor B 〉=100.
Circuit working principle of the present utility model is: utilize lumination of light emitting diode whether to judge the quality of small capacitor.
Triode Q1 and triode Q2 form Darlington compositing amplification tube circuit, and it has high enlargement factor.When red, black two test pencils of tester contact the small capacitor two ends, the one charging current testing capacitor of flowing through is just arranged, although this charging current is very small, amplifies metapedes through the Darlington compositing amplification tube circuit of high-amplification-factor and can drive luminotron LED and light luminous.If LED is not luminous, the expression capacitor illustrates that without charging ability inner broken string damages.
It is better little that triode pipe Q1 and triode Q2 two pipes all require penetrating current to heal.The LED red light emitting diodes is if can use high brightness LED then better.
The test pencil that red, black two test pencils can adopt common universal electric meter to use.
Because this tester when not using, is not consume electric energy, so tester needn't arrange power switch.
During use, only need the two ends with red, black two test pencils while contact measured capacitor, luminotron LED should be once glittering, then extinguishes, and the expression capacitor is intact.
If LED is not glittering, the inner broken string of expression capacitor C1 damages; If the glittering rear luminosity of LED only is dimmed rather than extinguishes, expression capacitor internal existence electric leakage; If LED Chang Liang does not put out, the expression capacitor internal is Damage by Short Circuit.
Because this tester has higher measurement sensitivity, it is suitable for test capacity greater than tens pF, less than 0.1 μ F.When test, the staff two ends do not contact metal part red, black meter pen simultaneously, otherwise the affiliation that adds of human body resistance makes LED send out all the time the low light level, makes you think that capacitor has electric leakage by mistake.
This tester can also as logical table, can check the break-make situation of circuit according to the luminous situation of LED except the quality of differentiating small capacitor, also can differentiate the quality of PN junction in diode, the triode.
As mentioned above, then can well realize the utility model.
Claims (5)
1. capacity measuring set, it is characterized in that: comprise the capacity measuring set housing, and the motherboard circuit that is arranged on the capacity measuring set enclosure interior, and the connector lug that is arranged on the capacity measuring set housing sidewall, described motherboard circuit comprises direct supply V1, and Darlington compositing amplification tube circuit, and LED 1, after being connected with LED 1, the positive pole of described direct supply V1 is connected with connector lug, its negative pole is connected with Darlington compositing amplification tube circuit, and Darlington compositing amplification tube circuit also is connected with LED 1 when being connected with connector lug.
2. capacity measuring set according to claim 1, it is characterized in that: described Darlington compositing amplification tube circuit is made of triode Q1 and the triode Q2 of series connection, the E utmost point of described triode Q2 is connected with the negative pole of direct supply V1, the B utmost point of triode Q1 is connected with connector lug, and the C utmost point of triode Q1 is connected C and extremely all is connected with LED 1 with triode Q2.
3. capacity measuring set according to claim 2, it is characterized in that: described connector lug is connected with red test pencil and black meter pen.
4. capacity measuring set according to claim 2 is characterized in that: dry cell or lithium battery that described direct supply V1 is 3V.
5. the described capacity measuring set of any one according to claim 2-4 is characterized in that: triode Q1 selects 9014 type silicon NPN triodes, requires its enlargement factor B 〉=220, and triode Q2 selects 9013 type silicon NPN triodes, requires its enlargement factor B 〉=100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220406967 CN202720291U (en) | 2012-08-17 | 2012-08-17 | Capacitance tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220406967 CN202720291U (en) | 2012-08-17 | 2012-08-17 | Capacitance tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202720291U true CN202720291U (en) | 2013-02-06 |
Family
ID=47622113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220406967 Expired - Fee Related CN202720291U (en) | 2012-08-17 | 2012-08-17 | Capacitance tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202720291U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439618A (en) * | 2013-09-09 | 2013-12-11 | 黄月华 | Low-capacity capacitor tester |
-
2012
- 2012-08-17 CN CN 201220406967 patent/CN202720291U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103439618A (en) * | 2013-09-09 | 2013-12-11 | 黄月华 | Low-capacity capacitor tester |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130206 Termination date: 20130817 |