CN101603978A - Automatic range conversion method and device in the alternating-current measurement - Google Patents
Automatic range conversion method and device in the alternating-current measurement Download PDFInfo
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Abstract
The present invention relates to automatic range conversion method in a kind of alternating-current measurement, described alternating-current measurement comprises with certain sampling rate samples to tested AC signal and sampled signal is carried out analog to digital conversion, adopt during described analog to digital conversion with the different mining sample value amplitude that obtains in the different range of the binary number representation of one digit number, and will represent that directly the binary number of its amplitude of samples size and first setting value compare, according to described comparative result, select its range.The present invention has also disclosed a kind of device of automatic conversioning broad.Implement automatic range conversion method and device in the alternating-current measurement of the present invention, have following beneficial effect: can change range quickly and automatically.
Description
Technical field
The present invention relates to the alternating current parameter field tests, more particularly, relate to automatic range conversion method and device in a kind of alternating-current measurement.
Background technology
Because AC signal is the size and Orientation signal that changes of cycle in time, for example, a sine wave, when it was sampled, each sampling point value was all different, crest is arranged, also trough arranged.Generally with the signal amplitude of the effective value of its periodic signal, the size of reflected signal.Traditional way is: AC signal is become direct current signal through transmitter, direct current signal is sent AD sampling again, calculate and obtain effective value, perhaps direct AC sampling, signal calculated effective value.But when AC signal was tested, said method must be several all after dates, just can obtain the effective value of signal.Just, effective value can not reflect the variation of peak value fast.In the high-precision AC fields of measurement; usually can design the switching of range, for example, when equipment is located at little electric current (voltage) gear; electric current (voltage) becomes to change (mainly being to increase) suddenly; at this moment, if still adopt traditional way, the moment of switching gear will lag behind several cycles of actual signal; the assumption period number is 4; phase is 20ms weekly, and than the actual signal 80ms that lags behind at least, the hysteresis of 80ms will cause the accident in some occasion.Equipment can not be changed range fast and accurately, not only causes measurement result inaccurate, serious meeting damage equipment, causes the accident.
Summary of the invention
The technical problem to be solved in the present invention is, at prior art above-mentioned can not the tested AC signal of rapid reaction peak change, may cause the defective that the result is inaccurate even cause the accident, a kind of quick identification AC signal size is provided, can changes range conversion method and device quickly and automatically.
The technical solution adopted for the present invention to solve the technical problems is: construct automatic range conversion method in a kind of alternating-current measurement, described alternating-current measurement comprises with certain sampling rate samples to tested AC signal and sampled signal is carried out analog to digital conversion, adopt during described analog to digital conversion with the different mining sample value amplitude that obtains in the different range of the binary number representation of one digit number, and will represent that directly the binary number of its amplitude of samples size and first setting value compare, according to described comparative result, select its range.
In method of the present invention, also comprise the steps:
A) whether judge absolute value that this sampling carries out the binary number that obtains after the analog to digital conversion more than or equal to first setting value, in this way, execution in step B); As not, wait for the next sampled signal duplicate step of laying equal stress on;
B) wait for next sampled signal, whether the absolute value of judging the binary number that obtains after its analog to digital conversion greater than described first setting value, in this way, and execution in step C); As not, steps A is returned in first counter O reset);
C) first counter adds 1, and whether the value of judging described first counter greater than second setting value, in this way, and execution in step D); As not, return step B);
D) current range is transformed into than its big one grade range, steps A is returned in first counter O reset).
In method of the present invention, described first setting value comprises a binary number less than the maximum binary number that is used for representing the maximum amplitude of samples value of current range, and the difference between described maximum binary number and described first setting value is less than described second setting value.
In method of the present invention, described binary number comprises 16,32 or 64 bits.
In method of the present invention, described steps A) also comprises the steps: in
A1) whether judge the binary number that obtains after the described analog to digital conversion greater than the 3rd setting value, in this way, wait for beginning sampling next time, as not, execution in step A2);
A2) second counter adds 1;
A3) whether the value of judging described second counter greater than the 4th setting value, in this way, second counter O reset, the conversion range is to less one grade of more current range; As not, return and wait for beginning sampling next time.
In method of the present invention, described the 4th setting value is included in total sampling number in the described AC signal one-period.
In method of the present invention, when beginning to test, to all counter O resets and set each setting value.
The present invention has also disclosed a kind of device of automatic conversioning broad, the sampling module that comprises the memory module that is used to store data, the output signal of described input attenuation module is sampled and the signal that described sampling module is obtained carried out analog-to-digital analog-to-digital conversion module, it is characterized in that, also comprise and be used to judge the output valve of described analog-to-digital conversion module and the size between first setting value, and control the pad value of described input attenuation module according to described judged result, thereby obtain the automatic modular converter of range of different ranges.
In device of the present invention, the automatic modular converter of described range further comprises: first judging unit, second judging unit, first counter, the first counter judging unit and the first counter operating unit; Whether described first judging unit is used to judge the binary numeral of current sampled signal amplitude after analog to digital conversion more than or equal to first setting value, and whether its judged result decision starts second judge module; Whether described second judging unit is used to judge the binary numeral of sampled signal amplitude after analog to digital conversion of next sampling that is right after the handled sampling of above-mentioned first judging unit greater than first setting value, and its judged result determines the operation of first counter; Described first counter is used to count the number of times of amplitude of samples greater than first setting value; The described first counter judging unit is used to read described first Counter Value, and itself and second setting value are compared; The described first counter operating unit is used for described first counter is added 1 or zero clearing.
Also comprise the 3rd judging unit, second counter, the second counter judging unit and the second counter operating unit; Described the 3rd judging unit is used to judge that whether the binary number of the described amplitude of samples of expression is greater than the 3rd setting value; Described second counter is used to count sampling number; The described second counter judging unit is used to read described second Counter Value and itself and the 4th setting value is compared; The described second counter operating unit is used for described second counter is added 1 or zero clearing.
Implement automatic range conversion method and device in the alternating-current measurement of the present invention, has following beneficial effect: owing to adopt digital signal after the fixing binary number of figure place is represented analog to digital conversion in the current range, and with less than the binary number of expression this range peak value as first setting value, when the analogue signal amplitude value of sampling when repeatedly (its number of times more than first setting value to the sampling number of peak value) is greater than above-mentioned first setting value, can judge the sure maximal value of peak value of measured signal greater than current range, therefore, can change range quickly and automatically.
Description of drawings
Fig. 1 be in the alternating-current measurement of the present invention the automatic range conversion method and the device embodiment in method flow diagram;
Fig. 2 is the structural representation that installs among the described embodiment;
Fig. 3 is the automatic modular converter structural representation of the range in the described embodiment device.
Embodiment
Embodiments of the present invention is further illustrated below in conjunction with accompanying drawing.
As shown in Figure 1, among automatic range conversion method and the device embodiment, its range conversion method comprises the steps: in alternating-current measurement of the present invention
S11 obtains this sampled value: in this step, beginning as the automatic range conversion method in the alternating-current measurement, begin to obtain the sampled value to AC signal, this sampled value is that tested AC signal Direct Sampling is got, the amplitude of AC signal when its amplitude is exactly sampling.In the present embodiment, the sampling of AC signal just begun to test can not interrupt, the speed of its sampling also is prior setting, and for example, sampling is 1024 times in the one-period of AC signal.In this step, may be any position up-sampling in the AC signal one-period, the difference of sampling location can't influence test.In the present embodiment, when system powers on or begins this when test, all can be with the test macro initialization, in initialization procedure, will read in the system of being stored in each setting value and with each counter O reset.
S13 will obtain sampled value and carry out analog to digital conversion, with fixing its amplitude of samples of binary number representation of figure place: in this step, the sampled value that obtains is carried out analog to digital conversion, the binary number representation of its amplitude of samples with multidigit come out, in the present embodiment, above-mentioned binary number is a fixedly binary number of figure place, and the figure place of this binary number is constant in different ranges, for example, at range is 2 o'clock, this binary number is 16, is 20 o'clock at range, and this binary number is still 16.In the present embodiment promptly, when range is 2, the sampled value of the binary number 1111111111111111 expression peak values 2 that obtain after sampling and the analog to digital conversion; And be 20 o'clock at range, the sampled value of the binary number 1111111111111111 expression peak values 20 that obtain after sampling and the analog to digital conversion.Certainly, in other embodiments, also can be with the binary number representation of other figure places, for example, 32 or 64.
Is the described binary number absolute value of S14 more than or equal to first setting value? in this step, whether the absolute value of judging the binary number that obtains after this sampled value analog to digital conversion is greater than first setting value, if more than or equal to first setting value, execution in step S15; If not, execution in step S20.Certainly, first setting value equally also is a binary number, this binary number is less than in the above-mentioned expression range peaked 1111111111111111, and, difference between first setting value and the above-mentioned expression maximal value binary number is not more than second setting value, that is to say, if the maximal value of tested AC signal is just in current range, after the sampling of what range value in office more than or equal to first setting value, can not have immediately following the sampling of this sampling, continuous, its number greater than second setting value.Therefore, if the sampling greater than first setting value of second setting value just can be judged measured signal necessarily greater than current range, current range need be strengthened.
S15 waits for and obtains binary number after the analog to digital conversion of sampling next time: begun by this step, enter the step that judges whether to need to increase range, before this step, once amplitude of samples is equal to or greater than preset value (first setting value), and in this step, obtain the sampling of (being this sampling) after the last sampling exactly, and, obtain representing the binary number of its amplitude of samples its sampled value analog to digital conversion.
Is this binary number absolute value of S16 greater than first setting value? in this step, whether the binary number of judging above-mentioned this amplitude of samples of expression in this way, represents the amplitude of measured AC signal still rising execution in step S17 greater than first setting value; As not being, represent that the amplitude of measured AC signal is descending execution in step S24.
S17 first counter adds 1: in this step, the value in first counter is added 1, be illustrated in detect amplitude of samples and enter zone between first setting value and this range maximal value after, detect once amplitude of samples greater than first setting value.
Is S18 first Counter Value greater than second setting value? judge that whether value in first counter is greater than second setting value, if greater than, the maximal value (peak value) of the AC signal that expression is now tested is greater than the maximal value of current range, be not enough tested AC signal, the execution in step S19 of measuring of current range; If be not more than, then return step S15.
S19 increases range, and first counter please zero: in this step, increase range, and promptly on the basis of current range, range extension; For example, current range is 2, and the range on the range 2 is 20, expands range to 20 by 2 exactly in this step; Afterwards,, and jump to step S25, test of beginning next round and range adjustment with first counter O reset.
Is the described binary number absolute value of S20 more than or equal to the 3rd setting value? as shown in Figure 1, this step is in above-mentioned steps S14, the binary number of judging this amplitude of samples value of expression is not greater than or equal to after (promptly less than) first setting value, a back to back judgement, in this step, whether judge above-mentioned binary number more than or equal to the 3rd setting value, if, execution in step S25; If not, execution in step S21.What deserves to be mentioned is, in this step, above-mentioned the 3rd setting value and above-mentioned first setting value are similar, and difference is, the 3rd setting value residing position in AC signal is different with first setting value, and it is pairing that the pairing amplitude of the 3rd setting value is far smaller than first setting value.
S21 second Counter Value adds 1: in this step, the numerical value in second counter is added 1, expression detects the sampling of its amplitude less than the 3rd setting value.
Is S22 second Counter Value greater than the 4th setting value? judge that whether numerical value in second counter is greater than the 4th setting value, in the present embodiment, the 4th setting value is exactly the sampling number in the AC signal one-period, if the numerical value in second counter is greater than the 4th setting value, execution in step S23; Otherwise, execution in step S25.
S23 reduces range, second counter O reset: because the numerical value in above-mentioned second counter is greater than the 4th setting value, can be understood as after the sampling of finishing a signal period, in the binary number of expression amplitude of samples, all there not be discovery greater than the 3rd setting value, be in the whole cycle, the amplitude of measured signal is all less than the 3rd setting value, and the 3rd setting value only corresponding less than current range peaked half.Promptly for current range, therefore the maximal value of tested waveform can need not reduce range greater than half of range, empties second counter, and returns step S25.
S24 first counter O reset: in this step,, and return step S25 with the value zero clearing in first counter.
S25 begins next time sampling: waits for a period of time, and when to time of beginning sampling next time, beginning sampling next time, repetition above-mentioned steps.
In the present embodiment, above-mentioned steps is that a complete range is regulated, and both can automatically current range be become big when measured signal becomes big suddenly, also can hour current range be diminished in measured signal.Certainly, in other embodiments, also may not need function that current range is diminished, at this moment, S20 removes to S23 with step, directly returns step S25 under the situation that is not greater than or equal to first setting value among the step S14, that's all.That is to say that above-mentioned steps S20 is can be non-existent to S23, not excessive above-mentioned steps S20 is not when S23 exists, and the automatic adjusting of range can only be enlarged by current range, and can not dwindle.
As shown in Figure 2, also disclosed the device of automatic range conversion in a kind of alternating-current measurement in the present embodiment, comprise the memory module 4 that is used to store data, carry out analog-to-digital analog-to-digital conversion module 2 to the sampling module 1 of sampling with to the signal that sampling module 1 is obtained through the input signal (being tested AC signal) of overdamping, also comprise and be used to judge the output valve of analog-to-digital conversion module 2 and the size between first setting value, and control the pad value of described input attenuation, thereby obtain the automatic modular converter 3 of range of different ranges according to its judged result.In Fig. 2, sampling module 1 and analog-to-digital conversion module 2 are passed through in the input measured signal that is attenuated as can be seen successively, enter the automatic modular converter 3 of range.The automatic modular converter 3 of range is obtained each parameter that comprises first setting value by memory module 4 simultaneously, the output control range conversion equipment 5 of the automatic modular converter 3 of range, and the damping capacity of these range conversion equipment 5 control input signals has obtained different ranges.
As shown in Figure 3, the automatic modular converter 3 of range further comprises: first judging unit 31, second judging unit 32, first counter 33, the first counter judging unit 34 and the first counter operating unit 35; Wherein, whether first judging unit 31 is used to judge the binary numeral of current sampled signal amplitude after analog to digital conversion more than or equal to first setting value, and whether its output decision starts second judging unit 32; Whether second judging unit 32 is used to judge the binary numeral of current sampled signal amplitude after analog to digital conversion greater than first setting value, and its output determines the operation of first counter 33; First counter 33 is used to count the number of times of amplitude of samples greater than first setting value; The first counter judging unit 34 is used to read the value of first counter 33, and itself and second setting value are compared; The first counter operating unit 35 is used for first counter 33 is added 1 or zero clearing.
In Fig. 3, above dotted line is to be used to increase the needed assembly of range, and each unit below above-mentioned dotted line then is used to reduce range.
Also comprise the 3rd judging unit 36, second counter 37, the second counter judging unit 38 and the second counter operating unit 39 among Fig. 3; The 3rd judging unit 36 is used to judge that whether the binary number of expression amplitude of samples is greater than the 3rd setting value; Second counter 37 is used to count sampling number; The second counter judging unit 38 is used to read described second Counter Value and itself and the 4th setting value is compared; The second counter operating unit 39 is used for described second counter is added 1 or zero clearing.
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 (10)
1. automatic range conversion method in the alternating-current measurement, described alternating-current measurement comprises with certain sampling rate samples to tested AC signal and sampled signal is carried out analog to digital conversion, it is characterized in that, adopt during described analog to digital conversion with the different mining sample value amplitude that obtains in the different range of the binary number representation of one digit number, and will represent that directly the binary number of its amplitude of samples size and first setting value compare, according to described comparative result, select its range.
2. automatic range conversion method in the alternating-current measurement according to claim 1 is characterized in that, also comprises the steps:
A) whether judge absolute value that this sampling carries out the binary number that obtains after the analog to digital conversion more than or equal to first setting value, in this way, execution in step B); As not, wait for the next sampled signal duplicate step of laying equal stress on;
B) wait for next sampled signal, whether the absolute value of judging the binary number that obtains after its analog to digital conversion greater than described first setting value, in this way, and execution in step C); As not, steps A is returned in first counter O reset);
C) first counter adds 1, and whether the value of judging described first counter greater than second setting value, in this way, and execution in step D); As not, return step B);
D) current range is transformed into than its big one grade range, steps A is returned in first counter O reset).
3. automatic range conversion method in the alternating-current measurement according to claim 2, it is characterized in that, described first setting value comprises a binary number less than the maximum binary number that is used for representing the maximum amplitude of samples value of current range, and the difference between described maximum binary number and described first setting value is less than described second setting value.
4. automatic range conversion method in the alternating-current measurement according to claim 3 is characterized in that, described binary number comprises 16,32 or 64 bits.
5. automatic range conversion method in the alternating-current measurement according to claim 2 is characterized in that, described steps A) in also comprise the steps:
A1) whether judge the binary number that obtains after the described analog to digital conversion greater than the 3rd setting value, in this way, wait for beginning sampling next time, as not, execution in step A2);
A2) second counter adds 1;
A3) whether the value of judging described second counter greater than the 4th setting value, in this way, second counter O reset, the conversion range is to less one grade of more current range; As not, return and wait for beginning sampling next time.
6. automatic range conversion method in the alternating-current measurement according to claim 5 is characterized in that, described the 4th setting value is included in total sampling number in the described AC signal one-period.
7. according to automatic range conversion method in any described alternating-current measurement of claim 1-6, it is characterized in that, when beginning to test, to all counter O resets and set each setting value.
8. the device of automatic range conversion in the alternating-current measurement, the sampling module that comprises the memory module that is used to store data, the output signal of described input attenuation module is sampled and the signal that described sampling module is obtained carried out analog-to-digital analog-to-digital conversion module, it is characterized in that, also comprise and be used to judge the output valve of described analog-to-digital conversion module and the size between first setting value, and control the pad value of described input attenuation module according to described judged result, thereby obtain the automatic modular converter of range of different ranges.
9. device according to claim 8 is characterized in that, the automatic modular converter of described range further comprises: first judging unit, second judging unit, first counter, the first counter judging unit and the first counter operating unit; Whether described first judging unit is used to judge the binary numeral of current sampled signal amplitude after analog to digital conversion more than or equal to first setting value, and whether its judged result decision starts second judge module; Whether described second judging unit is used to judge the binary numeral of sampled signal amplitude after analog to digital conversion of next sampling that is right after the handled sampling of above-mentioned first judging unit greater than first setting value, and its judged result determines the operation of first counter; Described first counter is used to count the number of times of amplitude of samples greater than first setting value; The described first counter judging unit is used to read described first Counter Value, and itself and second setting value are compared; The described first counter operating unit is used for described first counter is added 1 or zero clearing.
10. device according to claim 9 is characterized in that, also comprises the 3rd judging unit, second counter, the second counter judging unit and the second counter operating unit; Described the 3rd judging unit is used to judge that whether the binary number of the described amplitude of samples of expression is greater than the 3rd setting value; Described second counter is used to count sampling number; The described second counter judging unit is used to read described second Counter Value and itself and the 4th setting value is compared; The described second counter operating unit is used for described second counter is added 1 or zero clearing.
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Cited By (8)
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| CN102466749A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Method for automatically determining appropriate measuring range and universal meter |
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| CN105486901A (en) * | 2015-11-24 | 2016-04-13 | 深圳市科陆电子科技股份有限公司 | AC signal measuring method, device and instrument |
| CN108918954A (en) * | 2018-04-17 | 2018-11-30 | 广东核电合营有限公司 | Range signal processing method and system among a kind of Nuclear Instrument measuring system |
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| CN102466749A (en) * | 2010-11-03 | 2012-05-23 | 北京普源精电科技有限公司 | Method for automatically determining appropriate measuring range and universal meter |
| CN102466749B (en) * | 2010-11-03 | 2015-12-09 | 北京普源精电科技有限公司 | A kind of method and multimeter automatically determining suitable range |
| CN103439569A (en) * | 2013-08-27 | 2013-12-11 | 江苏林洋电子股份有限公司 | Wide-range measuring range self-adaption voltage quality monitoring method |
| CN103439569B (en) * | 2013-08-27 | 2016-01-20 | 江苏林洋电子股份有限公司 | A kind of wide region range self-adapting voltage quality monitoring method |
| CN105486901A (en) * | 2015-11-24 | 2016-04-13 | 深圳市科陆电子科技股份有限公司 | AC signal measuring method, device and instrument |
| CN108918954A (en) * | 2018-04-17 | 2018-11-30 | 广东核电合营有限公司 | Range signal processing method and system among a kind of Nuclear Instrument measuring system |
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| CN112362960A (en) * | 2021-01-14 | 2021-02-12 | 武汉海奥电气有限公司 | High-speed high-precision large-dynamic-range electrical parameter measuring system and method |
| CN112903000A (en) * | 2021-03-26 | 2021-06-04 | 歌尔光学科技有限公司 | Sensor control method, sensor control device and storage medium |
| CN115575688A (en) * | 2022-09-29 | 2023-01-06 | 北京航天计量测试技术研究所 | Weak current detection circuit |
| CN115575688B (en) * | 2022-09-29 | 2023-11-07 | 北京航天计量测试技术研究所 | Weak current detection circuit |
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| CN101603978B (en) | 2012-05-30 |
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