CN2652061Y - Digital TV-set intemediate frequency calibrating equipment - Google Patents
Digital TV-set intemediate frequency calibrating equipment Download PDFInfo
- Publication number
- CN2652061Y CN2652061Y CN 200320116540 CN200320116540U CN2652061Y CN 2652061 Y CN2652061 Y CN 2652061Y CN 200320116540 CN200320116540 CN 200320116540 CN 200320116540 U CN200320116540 U CN 200320116540U CN 2652061 Y CN2652061 Y CN 2652061Y
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- CN
- China
- Prior art keywords
- digital
- frequency
- signal
- intermediate frequency
- circuit
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- 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.)
- Expired - Fee Related
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- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
Abstract
The utility model relates to a digital TV intermediate frequency calibration instrument, which comprises an amplifying circuit, a filter circuit and a limiting amplifying circuit. The signal input terminal of the utility model is connected with the intermediate frequency output terminal of a TV high-frequency head, and the signal output terminal is connected with a digital frequency meter. An intermediate frequency signal is extracted from the intermediate frequency output terminal of the TV high-frequency head for amplifying, filtering and limiting processing. After being limited, the intermediate frequency signal is transmitted to the digital frequency meter for displaying. Therefore, maintenance staffs can adjust an intermediate frequency transformer according values displayed on the digital frequency meter until the values displayed on the digital frequency meter achieving standard values. The digital TV intermediate frequency calibration instrument has the advantages of accurate signal adjustment, convenient and quick maintenance, assured repair quality, small volume and great portability, and is a preferred signal monitoring instrument for household appliance maintenance staffs.
Description
Technical field
The utility model belongs to the electric appliances service signal processing apparatus, is specifically related to a kind of digital TV intermediate frequency prover that is used to keep in repair television set.
Background technology
Along with improving constantly of people's living standard, the market owning amount of Chinese Color TV has reached 500,000,000.If maintenance rate 1% calculates per year, about about 5,000,000 of the maintenance total amount in the whole nation.In maintenance work, the drift of colour TV intermediate frequency is the typical fault of a lot of types, and the ratio that accounts for the maintenance total amount is very big.Traditional method for maintaining rule of thumb carries out, on one side the maintenance personal transfers intermediate frequency transformer (middle week), Yi Bian watch picture quality, so just there are a lot of human factors, make that the colour TV technical indicator of being keeped in repair is inconsistent, do not reach standard value, inefficiency, repair quality can not get guaranteeing.
Summary of the invention
The technical problem that the utility model mainly solves provides a kind of digital TV intermediate frequency prover, by the instrument monitoring IF-FRE, to increase work efficiency, guarantees repair quality.
The utility model digital TV intermediate frequency prover comprises amplifying circuit, filter circuit and amplitude limiting amplifier circuit, wherein by triode BG
1Reach resistance R 2, R
3, R
4, R
5Form amplifying circuit; The signal input part Sin that links to each other with the medium frequency output end of television high frequency head passes through resistance R
1, capacitor C
1With triode BG
1Base stage link to each other; Triode BG
1Collector electrode pass through capacitor C
2, inductance L
1With filter X
1Input link to each other; Filtered signal passes through capacitor C
5, C
6Integrated circuit (IC) with amplitude limiting amplifier circuit
1Signal input part link to each other, the signal after amplitude limit amplifies is through by inductance L
2, L
3The output transformer of forming carries out after the level translation by the impedance matching capacitor C
13, resistance R
12Sout links to each other with signal output part, and signal output part links to each other with digital frequency meter.
The digital TV intermediate frequency prover that the utility model is provided with, its intermediate-freuqncy signal is extracted from the medium frequency output end of television high frequency head, by amplification, filtering, amplitude limiting processing, gives digital frequency meter with the intermediate-freuqncy signal behind the amplitude limit and shows.The maintenance personal can regulate intermediate frequency transformer by the numerical value that digital frequency meter shows, the numerical value that shows until digital frequency meter reaches standard value.
Adopt digital TV intermediate frequency prover, Signal Regulation is accurate, and is easy to maintenance quick, guaranteed repair quality.Its volume is little, and is easy to carry, is the signal monitoring apparatus of electric appliances service personnel first-selection.
Description of drawings
Accompanying drawing is digital TV intermediate frequency prover circuit theory diagrams.
Embodiment
The utility model is to overlap independently signal monitoring apparatus, and its signal input part links to each other with the medium frequency output end of television high frequency head, and signal output part links to each other with digital frequency meter.Power supply is taken from the 12V feeder ear of colour TV.
As shown in the figure, digital TV intermediate frequency prover comprises amplifying circuit, filter circuit and amplitude limiting amplifier circuit, and wherein amplifying circuit is by triode BG
1And resistance R
2, R
3, R
4, R
5Form, signal input part Sin passes through resistance R
1, capacitor C
1With triode BG
1Base stage link to each other; Triode BG
1Collector electrode by the impedance matching capacitor C
2And inductance L
1With filter X
1Input link to each other filter X
1Model be ZFC-H38MV270; Filtered signal passes through capacitor C
5, C
6Integrated circuit (IC) with amplitude limiting amplifier circuit
1Signal input part link to each other integrated circuit (IC)
1Model be AN5132; Signal process after amplitude limit amplifies is by inductance L
2, L
3The output transformer of forming carries out after the level translation by the impedance matching capacitor C
13, resistance R
12Sout links to each other with signal output part.
Be provided with the frequency deviation indication in the foregoing circuit and use gauge outfit, this gauge outfit is passed through resistance R
9Be attempted by integrated circuit (IC)
1The the 6th, the 7th pin.By the direction and the size of frequency deviation indication gauge outfit indication frequency shift (FS), the maintenance personal can carry out coarse adjustment according to offset direction and size that frequency deviation indicates gauge outfit to show.Because the gauge outfit intuitive display, the maintenance personal can put the intermediate frequency transformer coarse adjustment in place at short notice, and the numeral that shows according to digital frequency meter is carried out accurate adjustment again, and the numerical value that shows until digital frequency meter reaches standard value.
Claims (2)
1, a kind of digital TV intermediate frequency prover comprises amplifying circuit, filter circuit and amplitude limiting amplifier circuit, it is characterized in that by triode BG
1And resistance R
2, R
3, R
4, R
5Form amplifying circuit; The signal input part Sin that links to each other with the medium frequency output end of television high frequency head passes through resistance R
1, capacitor C
1With triode BG
1Base stage link to each other; Triode BG
1Collector electrode pass through capacitor C
2, inductance L
1With filter X
1Input link to each other; Filtered signal passes through capacitor C
5, C
6Integrated circuit (IC) with amplitude limiting amplifier circuit
1Signal input part link to each other, the signal after amplitude limit amplifies is through by inductance L
2, L
3The output transformer of forming carries out after the level translation by the impedance matching capacitor C
13, resistance R
12Sout links to each other with signal output part, and signal output part links to each other with digital frequency meter.
2, digital TV intermediate frequency prover according to claim 1 is characterized in that being provided with in the foregoing circuit frequency deviation indication and uses gauge outfit, and this gauge outfit is passed through resistance R
9Be attempted by integrated circuit (IC)
1The the 6th, the 7th pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320116540 CN2652061Y (en) | 2003-10-31 | 2003-10-31 | Digital TV-set intemediate frequency calibrating equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320116540 CN2652061Y (en) | 2003-10-31 | 2003-10-31 | Digital TV-set intemediate frequency calibrating equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2652061Y true CN2652061Y (en) | 2004-10-27 |
Family
ID=34346295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320116540 Expired - Fee Related CN2652061Y (en) | 2003-10-31 | 2003-10-31 | Digital TV-set intemediate frequency calibrating equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2652061Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207835B (en) * | 2006-12-22 | 2010-12-01 | 康佳集团股份有限公司 | Monitor for monitoring video signal power level |
-
2003
- 2003-10-31 CN CN 200320116540 patent/CN2652061Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207835B (en) * | 2006-12-22 | 2010-12-01 | 康佳集团股份有限公司 | Monitor for monitoring video signal power level |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |