CN101614759A - Digital oscilloscope real-time sampling method - Google Patents
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Abstract
The present invention relates to a kind of digital oscilloscope real-time sampling method, comprising: the deviation delta t of the initial sampling instant of the trigger point of measuring-signal and the first analog to digital converter sampling clock; Judge the magnitude relationship of Δ t and 1/ (f*N), wherein f is the frequency of sampling clock, and N is the number of analog to digital converter; As Δ t during less than 1/ (f*N), the arrangement mode of data be data, second analog to digital converter of first analog to digital converter data ... the data of the data of the data of N analog to digital converter, first analog to digital converter, second analog to digital converter, When (n-1)/(f*N)＜Δ t＜n/ (f*N), the arrangement mode of data be data, the n+1 analog to digital converter of n analog to digital converter data ... the data of the data of the data of N analog to digital converter, first analog to digital converter, second analog to digital converter ..., 1≤n≤N wherein.The data ordering of described digital oscilloscope real-time sampling method is first sampling instant after the signal triggering in proper order, thereby has improved the triggering horizontal accuracy.
Description
Technical field
The present invention relates to a kind of digital oscilloscope real-time sampling method.
Background technology
There is a deviation in existing digital oscilloscope between trigger point and the initial sampling instant of first analog to digital converter under the real-time sampling mode, when deviation is very big, can reduce the triggering horizontal accuracy of digital oscilloscope.
Summary of the invention
In view of this, be necessary, provide a kind of and can improve the digital oscilloscope real-time sampling method that triggers horizontal accuracy at the not high problem of the oscillographic triggering horizontal accuracy of conventional digital.
A kind of digital oscilloscope real-time sampling method comprises: the deviation delta t of the initial sampling instant of the trigger point of measuring-signal and the first analog to digital converter sampling clock; Judge the magnitude relationship of Δ t and 1/ (f*N), wherein f is the frequency of sampling clock, and N is the number of analog to digital converter; As Δ t during less than 1/ (f*N), the arrangement mode of data be data, second analog to digital converter of first analog to digital converter data ... the data of the data of the data of N analog to digital converter, first analog to digital converter, second analog to digital converter, When (n-1)/(f*N)＜Δ t＜n/ (f*N), the arrangement mode of data be data, the n+1 analog to digital converter of n analog to digital converter data ... the data of the data of the data of N analog to digital converter, first analog to digital converter, second analog to digital converter ..., 1≤n≤N wherein.
Preferably, the deviation delta t of the initial sampling instant of the trigger point of described measuring-signal and the first analog to digital converter sampling clock is to realize by counter.
Preferably, described N equals 2.
The data ordering of above-mentioned digital oscilloscope real-time sampling method is first sampling instant after the signal triggering in proper order, thereby has improved the triggering horizontal accuracy.
Description of drawings
Fig. 1 is the schematic diagram of digital oscilloscope real-time sampling mode.
Fig. 2 is the synoptic diagram of the deviation of trigger point and the initial sampling instant of first analog to digital converter less than half sampling period.
Fig. 3 is the synoptic diagram of the deviation of trigger point and the initial sampling instant of first analog to digital converter greater than half sampling period.
Embodiment
Digital oscilloscope mainly contains data acquisition and data processing shows two parts composition.Part of data acquisition is used for gathering and storing the Wave data that will observe, after the processing that the data processing display part is used for Wave data is correlated with and show.
Part of data acquisition is the core of digital storage oscilloscope, also is the important difference place of it and analog oscilloscope, and it is finished by the conversion of simulating signal to digital signal.In the existing digital oscilloscope, although many different Sampling techniques are arranged, mainly adopt two kinds of basic sample modes: real-time sampling mode and equivalent sampling mode.Each sample mode all has separately advantage for the difference of measuring object: when measuring high-frequency signal, digital oscilloscope may not be collected enough sample values in single pass, and employing equivalent sampling mode can accurately be caught these signals; At the signal of the maximum sampling rate of digital oscilloscope below half, the real-time sampling mode is desirable mode for frequency range, and at this moment, by " scanning " waveform once, it is visual accurately that digital oscilloscope just can obtain abundant some reconstruct.
Existing digital oscilloscope is to adopt the data splicing mode to sample by a plurality of analog to digital converters (for example two analog to digital converters) under the real-time sampling mode, and sampling principle as shown in Figure 1.What Fig. 1 illustrated is the situation of two analog to digital converters.With second analog to digital converter passage output data dislocation half period, promptly two sampling clock deviations 180 are spent, and the data splicing mode can make the data of two passages effective at the rising edge of same clock; If same clock is provided, the data of the second analog to digital converter passage just and the phasic difference mutually 180 of the data of the first analog to digital converter passage spend.S0, S1, S2 among Fig. 1 ... be the data point that first analog to digital converter samples, S0 ', S1 ', S2 ' ... it is the data point that second analog to digital converter samples.When waveform reconstruct, press S0, S0 ', S1, S1 ', S2, S2 ' ... series arrangement is reappeared.After signal triggering, rising edge or negative edge at sampling clock begin signal is sampled, by " scanning " waveform once can obtain fast, the abundant point of monopulse and transient signal (signal frequency range the maximum sampling rate of oscillograph half below) is with reconfiguration waveform.Can obtain the exact image that enough multiple spots come reconfiguration waveform by this method.
Fig. 2 is the deviation of trigger point and the initial sampling instant of first analog to digital converter situation during less than half sampling period.Fig. 3 is the deviation of trigger point and the initial sampling instant of first analog to digital converter situation during greater than half sampling period.In Fig. 2 and Fig. 3, the trigger point is represented with A.Existing digital oscilloscope all is that initial sampling instant with first analog to digital converter is as first initial sampling instant at both of these case.That is to say, when adopting the data splicing mode to sample for two analog to digital converters, no matter the deviation What gives of trigger point A and initial sampling instant, the arrangement mode of data all is with S0, S0 ', S1, S1 ', S2, S2 ' ... series arrangement, the i.e. data of second analog to digital converter after the data of elder generation's first analog to digital converter.
This real-time sampling technology that existing digital oscilloscope adopts, the less situation of trigger point A and initial sampling instant deviation ratio really can be under the situation that does not influence the triggering horizontal accuracy exact image of reconfiguration waveform.But when trigger point A and initial sampling instant deviation ratio are big, will greatly reduce the triggering horizontal accuracy of digital oscilloscope.
Situation for the deviation of the initial sampling instant of the trigger point A and the first analog to digital converter sampling clock during greater than half sampling period, measure the deviation delta t of initial sampling instant of the trigger point A of signal and the first analog to digital converter sampling clock (counter is equivalent to a clock timer by counter, can be used for measuring Δ t), then by judging the Δ t and the size in half sampling clock cycle, when Δ t less than half sampling clock during the cycle, the arrangement mode of data is S0, S0 ', S1, S1 ', S2, S2 ' ... i.e. first data of second analog to digital converter after the data of first analog to digital converter; When Δ t greater than half sampling clock during the cycle, the arrangement mode of data is S0 ', S1, S1 ', S2, S2 ' ... i.e. first data of first analog to digital converter after the data of second analog to digital converter, the deviation of so just having dwindled first initial sampling instant of the trigger point A of signal and sampling clock.The situation that the data splicing mode of two analog to digital converters is sampled can make in this way and arrangement first sampling instant after the signal triggering of data trigger horizontal accuracy thereby improve.
When the number of analog to digital converter was N, the phase differential of two adjacent analog to digital converters was 360 °/N arbitrarily, and the frequency of sampling clock is f.The data splicing mode can make the data of N passage effective at the rising edge of same clock; If same clock is provided, the n*360 °/N of phasic difference mutually of the data of the data of n analog to digital converter passage and the first analog to digital converter passage.Measure the deviation delta t of the initial sampling instant of the trigger point of signal and the first analog to digital converter sampling clock by counter, judge the magnitude relationship of Δ t and 1/ (f*N), as Δ t during less than 1/ (f*N), the arrangement mode of data be data, second analog to digital converter of first analog to digital converter data ... the data of the data of the data of N analog to digital converter, first analog to digital converter, second analog to digital converter, When (n-1)/(f*N)＜Δ t＜n/ (f*N), the arrangement mode of data be data, the n+1 analog to digital converter of n analog to digital converter data ... the data of the data of the data of N analog to digital converter, first analog to digital converter, second analog to digital converter ..., 1≤n≤N wherein.First sampling instant that is data ordering after the signal triggering triggers horizontal accuracy thereby improve.
As shown in the above description, when adopting N analog to digital converter sampling, just can be so that the triggering horizontal accuracy of digital oscilloscope improves N doubly.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (3)
1, a kind of digital oscilloscope real-time sampling method is characterized in that: comprising:
The deviation delta t of the initial sampling instant of the trigger point of measuring-signal and the first analog to digital converter sampling clock;
Judge the magnitude relationship of Δ t and 1/ (f*N), wherein f is the frequency of sampling clock, and N is the number of analog to digital converter;
As Δ t during less than 1/ (f*N), the arrangement mode of data be data, second analog to digital converter of first analog to digital converter data ... the data of the data of the data of N analog to digital converter, first analog to digital converter, second analog to digital converter,
When (n-1)/(f*N)＜Δ t＜n/ (f*N), the arrangement mode of data be data, the n+1 analog to digital converter of n analog to digital converter data ... the data of the data of the data of N analog to digital converter, first analog to digital converter, second analog to digital converter ..., 1≤n≤N wherein.
2, digital oscilloscope real-time sampling method according to claim 1 is characterized in that: the deviation delta t of the initial sampling instant of the trigger point of described measuring-signal and the first analog to digital converter sampling clock is to realize by counter.
3, digital oscilloscope real-time sampling method according to claim 1 is characterized in that: described N equals 2.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467347A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Method and system for reading measurement information with status bit information from measurement instrument |
| CN102467347B (en) * | 2010-11-03 | 2016-12-14 | 北京普源精电科技有限公司 | The method and system of the measurement data with status bit message are read from measuring instrument |
| CN109085403A (en) * | 2017-06-14 | 2018-12-25 | 北京普源精电科技有限公司 | A kind of method of adjustment and digital oscilloscope of undulating path |
| CN111044863A (en) * | 2019-12-24 | 2020-04-21 | 迈射智能科技(上海)有限公司 | Method for detecting partial discharge phenomenon of high-voltage electrical equipment |
| CN114839414A (en) * | 2022-06-30 | 2022-08-02 | 深圳市鼎阳科技股份有限公司 | Sampling time interval monitoring device and method for oscilloscope and oscilloscope |
| CN114910680A (en) * | 2022-07-18 | 2022-08-16 | 深圳市鼎阳科技股份有限公司 | Interleaved sampling oscilloscope and waveform reconstruction compensation method thereof |
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2009
- 2009-07-21 CN CN2009101089420A patent/CN101614759B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467347A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Method and system for reading measurement information with status bit information from measurement instrument |
| CN102467347B (en) * | 2010-11-03 | 2016-12-14 | 北京普源精电科技有限公司 | The method and system of the measurement data with status bit message are read from measuring instrument |
| CN109085403A (en) * | 2017-06-14 | 2018-12-25 | 北京普源精电科技有限公司 | A kind of method of adjustment and digital oscilloscope of undulating path |
| CN109085403B (en) * | 2017-06-14 | 2021-07-30 | 北京普源精电科技有限公司 | Waveform channel adjusting method and digital oscilloscope |
| CN111044863A (en) * | 2019-12-24 | 2020-04-21 | 迈射智能科技(上海)有限公司 | Method for detecting partial discharge phenomenon of high-voltage electrical equipment |
| CN114839414A (en) * | 2022-06-30 | 2022-08-02 | 深圳市鼎阳科技股份有限公司 | Sampling time interval monitoring device and method for oscilloscope and oscilloscope |
| CN114839414B (en) * | 2022-06-30 | 2022-09-06 | 深圳市鼎阳科技股份有限公司 | Sampling time interval monitoring device and method for oscilloscope and oscilloscope |
| CN114910680A (en) * | 2022-07-18 | 2022-08-16 | 深圳市鼎阳科技股份有限公司 | Interleaved sampling oscilloscope and waveform reconstruction compensation method thereof |
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