CN102466749B - A kind of method and multimeter automatically determining suitable range - Google Patents
A kind of method and multimeter automatically determining suitable range Download PDFInfo
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- CN102466749B CN102466749B CN201010531064.6A CN201010531064A CN102466749B CN 102466749 B CN102466749 B CN 102466749B CN 201010531064 A CN201010531064 A CN 201010531064A CN 102466749 B CN102466749 B CN 102466749B
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Abstract
The embodiment of the present invention provides a kind of method and the multimeter of automatically determining suitable range, belong to electric parameter measurement technical field, wherein said method comprises: in the process measuring electrical quantity to be measured, when judging that current range is not minimum range, measured value corresponding for described electrical quantity to be measured is compared with the maximum range value of each range one by one; The maximum range value minimum according to numerical value in the maximum range value being greater than described measured value and be less than described measured value maximum range value in the numerical range of the maximum maximum range value composition of numerical value determine that the range corresponding to the maximum range value that described numerical value is minimum is suitable range; Current range is switched to described suitable range.The advantage of the embodiment of the present invention is to find most suitable range more fast and accurately, for user provides measured value the most accurately, improves the search efficiency of digital multimeter in automatic range.
Description
Technical field
The present invention relates to electric parameter measurement technical field, particularly relate to a kind of method and the multimeter of automatically determining suitable range.
Background technology
In electric parameter measurement technical field, multimeter is the testing tool generally used, and it has two very important attributes: measurement function and measurement range.Measurement function determines can measure, as DC voltage, DC current, alternating voltage, alternating current, resistance, electric capacity etc. for which type of physical quantity.Measure range then determine this measurement function under measured signal whether can be accurately, thus obtain measurement result the most accurately.In prior art, maximum range value corresponding with current range for the measured value of electrical quantity to be measured as shown in Figure 1, compares, if be greater than maximum range value, then range is added one by the measurement range determination way of multimeter; If be less than maximum range value, then corresponding with last range again maximum range value compares, if be still less than maximum range value corresponding to last range, then range subtracted one, constantly repeats such process, until find suitable range.
But of the prior artly thisly determine that the method for range needs frequent switching range, make the process determining range very loaded down with trivial details, determine that the efficiency of range is also lower.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of method and the multimeter of automatically determining suitable range, what provided by the embodiment of the present invention in the process determining range a kind ofly determines that the method for suitable range and multimeter do not need frequent switching range just can determine suitable range fast automatically, determine that Range efficiency is higher, very convenient.
In order to realize the object of foregoing invention embodiment, the embodiment of the present invention provides a kind of method automatically determining suitable range, and described method comprises:
In the process measuring electrical quantity to be measured, when judging that current range is not minimum range, measured value corresponding for described electrical quantity to be measured is compared with the maximum range value of each range one by one;
The maximum range value minimum according to numerical value in the maximum range value being greater than described measured value and be less than described measured value maximum range value in the numerical range of the maximum maximum range value composition of numerical value determine that the range corresponding to the maximum range value that described numerical value is minimum is suitable range;
Current range is switched to described suitable range.
In order to judge the range of larger electrical quantity fast, before judging that current range is not minimum range, described method also comprises:
When judging that initial range is not maximum range, initial range is switched to maximum range;
When judging that described electrical quantity to be measured is greater than maximum range, then described maximum range is suitable range.
In order to judge the range of electrical quantity fast, when described current range is maximum range, described in judge that current range is not that minimum range comprises:
Judge whether described electrical quantity to be measured is greater than maximum range, if described electrical quantity to be measured is less than maximum range, then judge whether described electrical quantity to be measured is less than the last range of maximum range, if described electrical quantity to be measured is less than the last range of maximum range, then judge that current range is not minimum range.If described electrical quantity to be measured is greater than the last range of maximum range, then determine that described current range is suitable range.
In order to realize foregoing invention object, the present embodiment also provides a kind of multimeter, and described multimeter comprises:
Comparing unit, in the process measuring electrical quantity to be measured, when judging that current range is not minimum range, compares measured value corresponding for described electrical quantity to be measured with the maximum range value of each range one by one;
Determining unit, for being greater than of comparing according to described comparing unit maximum range value that in the maximum range value of described measured value, numerical value is minimum and be less than described measured value maximum range value in the numerical range of the maximum maximum range value composition of numerical value determine that the range corresponding to the maximum range value that described numerical value is minimum is suitable range;
Switch unit, for switching to the suitable range that described determining unit is determined by current range.
In order to switch to maximum range fast, switch unit, also for when judging that initial range is not maximum range, switches to maximum range by initial range.
In order to judge the range of electrical quantity fast, described multimeter also comprises:
First judging unit, for when described current range is maximum range, judge whether described electrical quantity to be measured is greater than maximum range, if judge, described electrical quantity to be measured is less than maximum range, then send and judge signal to the second judging unit;
Second judging unit, for the judgement signal sent according to described first judging unit, judge whether described electrical quantity to be measured is less than the last range of maximum range, if judge, described electrical quantity to be measured is less than the last range of maximum range, then judge that current range is not minimum range.
Second judging unit, if also for judging that described electrical quantity to be measured is greater than the last range of maximum range, then determine that described current range is suitable range.
The advantage of the embodiment of the present invention is to find most suitable range more fast and accurately, for user provides measured value the most accurately, improves the search efficiency of digital multimeter in automatic range.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow diagram determining range method in prior art.
The schematic flow diagram automatically determining the method for suitable range that Fig. 2 provides for the embodiment of the present invention.
Fig. 3 is the process flow diagram of example in the embodiment of the present invention.
Fig. 4 is the functional block diagram of multimeter in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Schematic description and description of the present invention is for explaining the present invention; but it is not as a limitation of the invention; based on the embodiment in the present invention; those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of technology automatically determining suitable range, is suitable for using in multimeter, and this technology does not need frequent switching range just can determine suitable range fast, determines that Range efficiency is higher, very convenient.
Based on this, the present embodiment provides a kind of method automatically determining suitable range, as shown in Figure 2, the schematic flow diagram automatically determining the method for suitable range that Fig. 2 provides for the embodiment of the present invention, the difference of the method and prior art (as shown in Figure 1) is to comprise the steps:
101. when judging that initial range is not maximum range, and initial range is switched to maximum range;
Initial range in this step is that the range given tacit consent under original state when multimeter starts to measure at every turn, when judging that initial range is not maximum range according to existing step, this step is not add 1 to range as prior art herein, but directly initial range is switched to maximum range, under maximum range, judge the relation of electrical quantity to be measured and maximum range again.
102. judge whether described electrical quantity to be measured is greater than maximum range, and when judging that described electrical quantity to be measured is greater than maximum range, then described maximum range is suitable range; When judging that described electrical quantity to be measured is less than maximum range, then proceed to step 103;
This step judges the relation of electrical quantity to be measured and maximum range again under maximum range according to step 101, when judging that electrical quantity to be measured is greater than maximum range, illustrate that multimeter has not had larger range to switch, can only measure under this maximum range, so now maximum range is suitable range.When judging that electrical quantity to be measured is less than maximum range, then must judge the relation of electrical quantity to be measured and the last range of maximum range further, proceed to step 103.
103. judge whether described electrical quantity to be measured is less than the last range of maximum range, if described electrical quantity to be measured is less than the last range of maximum range, then proceed to step 104; If described electrical quantity to be measured is greater than the last range of maximum range, then determine that described current range is suitable range.
This step connects step 102, when judging that electrical quantity to be measured is less than maximum range, then must judge the relation of electrical quantity to be measured and the last range of maximum range further, described step judges whether electrical quantity to be measured is less than the last range of maximum range, if described electrical quantity to be measured is less than the last range of maximum range, then proceed to step 104 to continue to judge, if described electrical quantity to be measured is greater than the last range of maximum range, then determine that described current range is suitable range.This step is basic identical with step of the prior art, therefore exceeds and repeat.
104. when judging that current range is not minimum range, compared one by one by measured value corresponding for electrical quantity to be measured with the maximum range value of each range;
This step is being judged to carry out after current range is not minimum range, and such as step 103, the maximum range as current range can not be minimum range, so can judge that current range is not minimum range.According to Fig. 2, because current range has not been minimum range, electrical quantity to be measured is less than again the maximum range value of the last range of current range, so electrical quantity to be measured is not large especially, the suitable range of corresponding electrical quantity to be measured neither be very high, so measured value corresponding for electrical quantity to be measured compares with the maximum range value of each range by this step one by one herein, wish the range determining electrical quantity place to be measured as early as possible, such as when the measured value that electrical quantity to be measured is corresponding is 10v, multimeter range comprises 200v except maximum range, 20v, 2v and 200mv, now just by 10v one by one with 200v, 20v, 2v and 200mv compares.
It should be noted that, if electrical quantity to be measured is less than initial range, then both can judge to this step according to step of the prior art.
105. according to the minimum maximum range value of numerical value in the maximum range value being greater than this measured value and be less than measured value maximum range value in the numerical range of the maximum maximum range value composition of numerical value determine that the minimum range corresponding to maximum range value of described numerical value is suitable range;
This step is determined the exact value scope at the measured value place that electrical quantity to be measured is corresponding according to step 104 and then is determined the suitable range of corresponding electrical quantity to be measured.The maximum range value of the measured value corresponding according to electrical quantity to be measured and each range compares the exact value scope can determining measured value place, and namely the maximal value of this numerical range is the maximum range value that in the maximum range value being greater than this measured value, numerical value is minimum; Namely the minimum value of numerical range is the maximum range value that in the maximum range value being less than measured value, numerical value is maximum, after determining this numerical range, suitable range corresponding to this electrical quantity to be measured can be defined as according to the maximum range value that numerical value in the maximum range value being greater than this measured value in this numerical range is minimum.Such as when the numerical range determining 10v place is 2v ~ 20v, that 20v is suitable range corresponding to 10v.
Current range is switched to suitable range by 106..
The suitable range that this step is determined according to step 105, thus current range is switched to suitable range, realize the object of by suitable range, electrical quantity to be measured being carried out to Measurement accuracy.
Can be known by the present embodiment and find out, the method automatically determining suitable range described in the present embodiment only has at most twice switching can determine the suitable range of electrical quantity to be measured, without the need to repeatedly switching as prior art, therefore the method described in the present embodiment can find most suitable range more fast and accurately, for user provides measured value the most accurately, improve the search efficiency of digital multimeter in automatic range.
In order to make those skilled in the art know that the method automatically determining suitable range understood described in the present embodiment, be described in detail by an example at this, this example is for the voltage to be measured of 10v, the range of multimeter is respectively 1000v, 200v, 20v, 2v and 200mv, and the initial range of multimeter is 200mv.
As shown in Figure 3, Fig. 3 is the process flow diagram of this example, because the initial range of multimeter is 200mv, and voltage to be measured actual be 10v, so digital signal to be converted to the measured value-250mv under 200mV range by multimeter according to measured value conversion formula used, 250mV is greater than 200mV with the more known 250mV of initial range maximal value 200mV, and then judge that initial range 200mv is not maximum range, so initial range is switched to the maximum range of 1000V by multimeter, according to measured value conversion formula, by digital signal, the measured value be converted under 1000V range is 10v to such multimeter, now judge that voltage 10v to be measured is less than 1000V maximum range, continue to judge whether voltage to be measured is less than last range---the 200v of maximum range, judge that voltage to be measured is less than last range---the 200v of maximum range, range due to 1000v is not minimum range, so by voltage 10v and 200V to be measured, 20V, 2V, 200mV compares one by one, obtain appropriate value scope 2V ~ 20V, it is the maximum range value that in the maximum range value being greater than this measured value 10v, numerical value is minimum according to the known 20v of this scope, so 20v is suitable range corresponding to 10v.Now multimeter switches to 20v range, thus completes the whole process automatically determining suitable range.
In order to effectively realize the method described in above-described embodiment, the present embodiment provides a kind of multimeter, and as shown in Figure 4, Fig. 4 is the functional block diagram of multimeter in the embodiment of the present invention.This multimeter comprises:
First judging unit 401, for when current range is maximum range, judge whether electrical quantity to be measured is greater than maximum range, if judge, electrical quantity to be measured is less than maximum range, then send and judge signal to the second judging unit 402;
Second judging unit 402, for the judgement signal sent according to the first judging unit 401, judge whether described electrical quantity to be measured is less than the last range of maximum range, if judge, electrical quantity to be measured is less than the last range of maximum range, then judge that current range is not minimum range; If judge, electrical quantity to be measured is greater than the last range of maximum range, then determine that described current range is suitable range
Comparing unit 403, in the process measuring electrical quantity to be measured, when the second judging unit 402 judges that current range is not minimum range, compares measured value corresponding for electrical quantity to be measured with the maximum range value of each range one by one;
Determining unit 404, for being greater than of comparing according to comparing unit 403 maximum range value that in the maximum range value of described measured value, numerical value is minimum and be less than described measured value maximum range value in the numerical range of the maximum maximum range value composition of numerical value determine that the range corresponding to the maximum range value that described numerical value is minimum is suitable range;
Switch unit 405, for switching to the suitable range that determining unit 404 is determined by current range.Also for when judging that initial range is not maximum range, initial range is switched to maximum range.
It can thus be appreciated that the multimeter that the present embodiment provides only has at most twice switching can determine the suitable range of electrical quantity to be measured, without the need to repeatedly switching as prior art, therefore the method described in the present embodiment can find most suitable range more fast and accurately, for user provides measured value the most accurately, improve the search efficiency of digital multimeter in automatic range.
Certainly; above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention, the protection domain be not intended to limit the present invention, all within logic of the present invention and principle; any amendment of making, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. automatically determine a method for suitable range, it is characterized in that, described method comprises:
In the process measuring electrical quantity to be measured, when judging that current range is not minimum range, measured value corresponding for described electrical quantity to be measured is compared with the maximum range value of each range one by one;
The maximum range value minimum according to numerical value in the maximum range value being greater than described measured value and be less than described measured value maximum range value in the numerical range of the maximum maximum range value composition of numerical value determine that the range corresponding to the maximum range value that described numerical value is minimum is suitable range;
Current range is switched to described suitable range.
2. method according to claim 1, is characterized in that, before judging that current range is not minimum range, described method also comprises:
When judging that initial range is not maximum range, initial range is switched to maximum range;
When judging that described electrical quantity to be measured is greater than maximum range, then described maximum range is suitable range.
3. method according to claim 2, is characterized in that, when described current range is maximum range, described in judge that current range is not that minimum range comprises:
Judge whether described electrical quantity to be measured is greater than maximum range, if described electrical quantity to be measured is less than maximum range, then judge whether described electrical quantity to be measured is less than the last range of maximum range, if described electrical quantity to be measured is less than the last range of maximum range, then judge that current range is not minimum range.
4. method according to claim 3, is characterized in that, if described electrical quantity to be measured is greater than the last range of maximum range, then determines that described current range is suitable range.
5. a multimeter, is characterized in that, described multimeter comprises:
Comparing unit, in the process measuring electrical quantity to be measured, when judging that current range is not minimum range, compares measured value corresponding for described electrical quantity to be measured with the maximum range value of each range one by one;
Determining unit, for being greater than of comparing according to described comparing unit maximum range value that in the maximum range value of described measured value, numerical value is minimum and be less than described measured value maximum range value in the numerical range of the maximum maximum range value composition of numerical value determine that the range corresponding to the maximum range value that described numerical value is minimum is suitable range;
Switch unit, for switching to the suitable range that described determining unit is determined by current range.
6. multimeter according to claim 5, is characterized in that,
Switch unit, also for when judging that initial range is not maximum range, switches to maximum range by initial range.
7. multimeter according to claim 6, is characterized in that, described multimeter also comprises:
First judging unit, for when described current range is maximum range, judge whether described electrical quantity to be measured is greater than maximum range, if judge, described electrical quantity to be measured is less than maximum range, then send and judge signal to the second judging unit;
Second judging unit, for the judgement signal sent according to described first judging unit, judge whether described electrical quantity to be measured is less than the last range of maximum range, if judge, described electrical quantity to be measured is less than the last range of maximum range, then judge that current range is not minimum range.
8. multimeter according to claim 7, is characterized in that,
Second judging unit, if also for judging that described electrical quantity to be measured is greater than the last range of maximum range, then determine that described current range is suitable range.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102901864A (en) * | 2012-10-11 | 2013-01-30 | 阳光电源股份有限公司 | Voltage detecting device |
| CN103018517B (en) * | 2012-12-04 | 2014-12-03 | 宁波继明电器有限公司 | Wireless electrical measuring instrument |
| CN103163350A (en) * | 2013-03-26 | 2013-06-19 | 广东电网公司电力科学研究院 | Frequency-selecting universal meter for measuring voltage and current |
| CN108931336A (en) * | 2017-05-23 | 2018-12-04 | 北京航天计量测试技术研究所 | A kind of high stability pressure control algorithm |
| CN110286257A (en) * | 2019-06-20 | 2019-09-27 | 西安易朴通讯技术有限公司 | Electric current detecting method and device, electronic equipment and computer readable storage medium |
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