CN1889697A - Method for realizing quantitative measurement in television high frequency electronic tuner tester - Google Patents
Method for realizing quantitative measurement in television high frequency electronic tuner tester Download PDFInfo
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- CN1889697A CN1889697A CN 200610013435 CN200610013435A CN1889697A CN 1889697 A CN1889697 A CN 1889697A CN 200610013435 CN200610013435 CN 200610013435 CN 200610013435 A CN200610013435 A CN 200610013435A CN 1889697 A CN1889697 A CN 1889697A
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Abstract
A method for realizing quantitative measurement in tester of TV high frequency electronic tuner includes applying standard signal source to carry out logarithm amplitude calibration on detector diode for obtaining revision table, obtaining relevant amplitude value or frequency response revision value from detecting signal measurement value and frequency value of tested signal source according to revision table then carrying out counter- logarithm conversion on test result and displaying test result in logarithm or in linear mode.
Description
Technical field
The present invention relates to the television high frequency electronic tuner tester field.
Background technology
TV is that television set is selected television channel with high-frequency electronic tuner (being commonly called as tuner), high-frequency TV signal is converted to the parts of intermediate-freuqncy signal.At present, the Regular History Frequency electronic tuner tester exist can only qualitative observation, the shortcoming of consistency difference.Display mode is a linear format, is that the detecting circuit with detector diode directly shows.But because the difference of detector diode, and the linearity that diode shows when different input signal strengths is also inconsistent, cause between the different testers measurement result inconsistent, the input signal amplitude not relative measurement index of a same simultaneously tester is also different, different detector diode detection curves are discreteness, as Fig. 1.The detection curve difference of corresponding diode as seen from Figure 2, fair curve are also different.
Summary of the invention
The invention provides a kind of method that the existing test result of high-frequency electronic tuner tester is difficult to the problem of quantification and consistency difference that solves.
Realize the method for quantitative measurment in the television high frequency electronic tuner tester of the present invention, it is characterized in that: with standard signal source detector diode is done the calibration calibration of logarithm amplitude, thereby obtain amplitude correction chart and frequency response correction table; By detector diode the rectified signal measured value in measured signal source and the frequency values in measured signal source are obtained corresponding range value and frequency response correction value according to correction chart again, calculate the range value in measured signal source, measurement result is a logarithm, test result is carried out the antilogarithm conversion, show test results with linearity.The different machines measured value all reaches consistent under logarithm or linear graduation demonstration when measuring tuner, and its relative measurement index is also consistent simultaneously at input signal amplitude to make same tester.Fig. 3 is the high-frequency electronic tuner tester fundamental diagram.
Television high frequency electronic tuner tester to the method for the amplitude measurement of television high frequency electronic tuner is:
A. standard signal source is set a fixed frequency in the working range frequency of detector diode, signal amplitude in the scope of detector diode work according to the descending variation of fixed amplitude, detecting circuit by the A/D sampling, writes down the detecting circuit value of unlike signal amplitude correspondence as correction chart by CPU then after programmable amplifier amplifies.
B. obtain after the correction chart, when carrying out the test of high-frequency electronic tuner, input measured signal source, CPU measures current detecting circuit X0, then by looking into correction chart, find the contiguous up and down some X1 in the correction chart interval that current magnitude of voltage is positioned at, (X1＜X0＜X2), X1, the range value of the standard signal source of X2 correspondence are Y1 and Y2 to X2, calculate the signal source range value Y0 of current magnitude of voltage correspondence by linear equation Y0=Y2-(Y2-Y1)/(X2-X1) * (X2-X0), as shown in Figure 4.
C. the logarithm measurement result of electronic tuning unit is carried out directly showing after the frequency response correction again or change into linear result and show.
The final curve of measuring in calibration calibration back of detector diode having been done the logarithm amplitude with standard signal source overlaps substantially as seen from Figure 4, and it is minimum that the measure error of different detector diodes is reduced to.
Modification method to the demodulation probe frequency response is:
A. standard signal source is set a fixed amplitude in the working range frequency of detector diode, the frequency of standard signal source is by the fixed frequency stepping, detecting circuit amplifies the back by the A/D sampling through programmable amplifier, writes down the difference of the demodulation probe measuring amplitude value of unlike signal frequency correspondence and standard value as correction chart by CPU then.
B. obtain after the correction chart, when carrying out the test of high-frequency electronic tuner, input measured signal source, CPU is according to work at present frequency F0, then by looking into correction chart, find the contiguous up and down some F1 in the correction chart interval that current frequency is positioned at, F2, the frequency response correction value of F1, F2 correspondence is Z1, Z2, calculates the frequency response correction value of current frequency values correspondence by linear equation Z0=Z2-(Z2-Z1)/(F2-F1) * (F2-F0).
C. the logarithm measurement result of electronic tuning unit is added that the correction value of frequency response directly shows or changes into linear the demonstration.
Fig. 5 overlaps substantially with the final curve of measuring in calibration calibration back that standard signal source has been done the logarithm amplitude to detector diode as can be seen, and it is minimum that the measure error of different detector diodes is reduced to.
It is to be dBuV with unit conversion that the logarithm measurement result of electronic tuning unit is changed into method that linear result shows, and corresponding relation is 1uV=0dBuV, passes through formula under the situation of known logarithm value x (dBuV)
X=20lg (y) calculates linear value y (uV).
Beneficial effect of the present invention:
1. realized the linear measurement index at different machines, the measurement consistency under the different input range situations has guaranteed the accuracy of measuring.
2. linear measurement is improved to quantitative measurment by observational measurement, is easy to debugging and observes waveform.
Description of drawings
Fig. 1 is different detector diode detection curve chart
Fig. 2 is the corresponding diode fair curve of Fig. 1 figure
Fig. 3 is the high-frequency electronic tuner tester fundamental diagram
Fig. 4 and Fig. 5 are the final curves of measuring in calibration calibration back of detector diode being made the logarithm amplitude of standard signal source
Embodiment
Embodiment 1
The method of testing of amplitude:
A. standard signal source is set a fixed frequency 300MHz in the working range frequency of detector diode, signal amplitude in the scope of detector diode work according to the descending variation of the amplitude of 1dB, detecting circuit by the A/D sampling, writes down the detecting circuit value of unlike signal amplitude correspondence as correction chart by CPU then after programmable amplifier amplifies.
B. obtain after the correction chart, when carrying out the test of high-frequency electronic tuner, input measured signal source, it is 81dBuV that CPU measures current detecting circuit X0, then by looking into correction chart, contiguous up and down some X1, the X2 that finds the correction chart interval that current magnitude of voltage is positioned at is respectively 80dBuV, 82dBuV, the range value of the standard signal source of X1, X2 correspondence is that Y1, Y2 are respectively 100dBuV, 101dBuV, and the signal source range value Y0 that calculates current magnitude of voltage correspondence by linear equation Y0=Y2-(Y2-Y1)/(X2-X1) * (X2-X0) is 100.5dBuV.
The final curve of measuring in calibration calibration back of detector diode having been done the logarithm amplitude with standard signal source overlaps substantially as seen from Figure 4, and it is minimum that the measure error of different detector diodes is reduced to.
C. the logarithm measurement result of electronic tuning unit is carried out directly showing after the frequency response correction again or change into linear result and show.
Concrete grammar is that amplitude units is converted into dBuV, and corresponding relation is 1uV=0dBuV, is that to calculate linear value y by formula x=20lg (y) under the situation of 100.5dBuV be that 105925uV is 105.925mV at known logarithm value x.
Embodiment 2
Modification method to the demodulation probe frequency response is:
A. standard signal source is set a fixed amplitude 107dBuV in the working range frequency of detector diode, the frequency of standard signal source is by fixed frequency 1MHz stepping, detecting circuit amplifies the back by the A/D sampling through programmable amplifier, writes down the difference of the detecting circuit value of unlike signal frequency correspondence and 107dBuV as correction chart by CPU then.
B. obtain after the correction chart, when carrying out the test of high-frequency electronic tuner, input measured signal source, CPU is 38.5MHz according to work at present frequency F0, then by looking into correction chart, contiguous up and down some F1, the F2 that finds the correction chart interval that current frequency is positioned at is respectively 38MHz, 39MHz, frequency response correction value Z1, the Z2 of F1, F2 correspondence are respectively 2dB, 2.2dB, the frequency response correction value Z0 that calculates current frequency values correspondence by linear equation Z0=Z2-(Z2-Z1)/(F2-F1) * (F2-F0) is 2.1dB, as shown in Figure 5.
Fig. 5 overlaps substantially with the final curve of measuring in calibration calibration back that standard signal source has been done the logarithm amplitude to detector diode as can be seen, and it is minimum that the measure error of different detector diodes is reduced to.
C. the logarithm measurement result of electronic tuning unit is added that the correction value of frequency response directly shows or changes into linear the demonstration.
The measuring-signal amplitude measurement is 100.5dBuV, and frequency is 38.9MHz, and correction value is 2.1dB, and last measured signal amplitude is 100.5-2.1=98.4dBuV.
Claims (4)
1, realizes the method for quantitative measurment in a kind of television high frequency electronic tuner tester, it is characterized in that: with standard signal source detector diode is done the calibration calibration of logarithm amplitude, thereby obtain amplitude correction chart and frequency response correction table; By detector diode the rectified signal measured value in measured signal source and the frequency values in measured signal source are obtained corresponding range value and frequency response correction value according to correction chart again, calculate the range value in measured signal source, measurement result is a logarithm, test result is carried out the antilogarithm conversion, show test results with linearity.
2, realize the method for quantitative measurment in a kind of television high frequency electronic tuner tester as claimed in claim 1, it is characterized in that: television high frequency electronic tuner tester to the method for the test of the amplitude of television high frequency electronic tuner is:
A. standard signal source is set a fixed frequency in the working range frequency of detector diode, signal amplitude in the scope of detector diode work according to the descending variation of fixed amplitude, detecting circuit by the A/D sampling, writes down the detecting circuit value of unlike signal amplitude correspondence as correction chart by CPU then after programmable amplifier amplifies;
B. obtain after the correction chart, when carrying out the test of high-frequency electronic tuner, input measured signal source, CPU measures current detecting circuit X0, then by looking into correction chart, (X1＜X0＜X2), the range value of the standard signal source of X1, X2 correspondence is Y1, Y2, calculates the signal source range value Y0 of current magnitude of voltage correspondence by linear equation Y0=Y2-(Y2-Y1)/(X2-X1) * (X2-X0) to find contiguous up and down some X1, the X2 in the correction chart interval that current magnitude of voltage is positioned at;
C. the logarithm measurement result of electronic tuning unit is carried out directly showing after the frequency response correction again or change into linear result and show.
3. realize the method for quantitative measurment in a kind of television high frequency electronic tuner tester as claimed in claim 1, it is characterized in that: television high frequency electronic tuner tester to the modification method of demodulation probe frequency response is:
A. standard signal source is set a fixed amplitude in the working range frequency of detector diode, the frequency of standard signal source is by the fixed frequency stepping, detecting circuit amplifies the back by the A/D sampling through programmable amplifier, writes down the difference of the demodulation probe measuring amplitude value of unlike signal frequency correspondence and standard value as correction chart by CPU then;
B. obtain after the correction chart, when carrying out the test of high-frequency electronic tuner, input measured signal source, CPU is according to work at present frequency F0, then by looking into correction chart, find the contiguous up and down some F1 in the correction chart interval that current frequency is positioned at, F2, the frequency response correction value of F1, F2 correspondence is Z1, Z2, calculates the frequency response correction value of current frequency values correspondence by linear equation Z0=Z2-(Z2-Z1)/(F2-F1) * (F2-F0);
C. the logarithm measurement result of electronic tuning unit is added that the correction value of frequency response directly shows or changes into linear the demonstration.
4. as realizing the method for quantitative measurment in claim 2 or the 3 described a kind of television high frequency electronic tuner testers, it is characterized in that:
It is to be dBuV with unit conversion that the logarithm measurement result of electronic tuning unit is changed into method that linear result shows, and corresponding relation is 1uV=0dBuV, calculates linear value y by formula x=201g (y) under the situation of known logarithm value x.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200610013435A CN1889697B (en) | 2006-04-04 | 2006-04-04 | Method for realizing quantitative measurement in television high frequency electronic tuner tester |
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| CN200610013435A CN1889697B (en) | 2006-04-04 | 2006-04-04 | Method for realizing quantitative measurement in television high frequency electronic tuner tester |
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| CN1889697A true CN1889697A (en) | 2007-01-03 |
| CN1889697B CN1889697B (en) | 2010-05-12 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437888A (en) * | 2011-12-16 | 2012-05-02 | 摩比天线技术（深圳）有限公司 | Calibration method and detection method for standing-wave ratio warning circuit |
| CN102857307A (en) * | 2011-06-30 | 2013-01-02 | 上海市计量测试技术研究院 | Calibration method and calibration device for digital mobile communication general-purpose tester |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2084696U (en) * | 1990-12-13 | 1991-09-11 | 岑志清 | Electronic tuning full channel tv field intensity multipurpose instrument |
| US5714876A (en) * | 1996-04-24 | 1998-02-03 | Tektronix, Inc. | In-service serial digital source signal-level and cable-length measurement |
| DE19957354A1 (en) * | 1999-11-29 | 2001-05-31 | Thomson Brandt Gmbh | Video frequency response adjustment |
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2006
- 2006-04-04 CN CN200610013435A patent/CN1889697B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102857307A (en) * | 2011-06-30 | 2013-01-02 | 上海市计量测试技术研究院 | Calibration method and calibration device for digital mobile communication general-purpose tester |
| CN102857307B (en) * | 2011-06-30 | 2015-06-24 | 上海市计量测试技术研究院 | Calibration method and calibration device for digital mobile communication general-purpose tester |
| CN102437888A (en) * | 2011-12-16 | 2012-05-02 | 摩比天线技术（深圳）有限公司 | Calibration method and detection method for standing-wave ratio warning circuit |
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| CN1889697B (en) | 2010-05-12 |
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