CN102297703A - Data collection equipment and method thereof - Google Patents
Data collection equipment and method thereof Download PDFInfo
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- CN102297703A CN102297703A CN2011101318427A CN201110131842A CN102297703A CN 102297703 A CN102297703 A CN 102297703A CN 2011101318427 A CN2011101318427 A CN 2011101318427A CN 201110131842 A CN201110131842 A CN 201110131842A CN 102297703 A CN102297703 A CN 102297703A
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Abstract
The invention discloses data collection equipment. The equipment comprises: an input terminal, which is used for receiving measuring signals; a plurality of amplifiers, wherein each of the amplifier has different amplification factors and is coupled to the input terminal to receive the measuring signals; a plurality of analog-to-digital converters, wherein each the analog-to-digital converter is coupled with the corresponding amplifier so as to carry out analog-to-digital conversion on amplification signals output by the amplifiers to obtain digital amplification signals; and a controller, wherein the controller is coupled with each the analog-to-digital converter and is used for selecting one digital amplification signal from one amplifier among the plurality of ones as an output signal according to sizes of the measuring signals and input voltage ranges of the corresponding analog-to-digital converters. Besides, the invention also discloses a data collection method that is suitable for being utilized by the data collection equipment.
Description
Technical field
The present invention relates to the data acquisition technology of measuring-signal size, relate in particular to by analog to digital conversion and come data acquisition equipment and collecting method that Dynamic Signal is measured.
Background technology
Existing data acquisition equipment with multiple range generally comprises an amplifier and an analog to digital converter, wherein amplifier amplifies measuring-signal, analog to digital converter will be a digital signal through the analog signal conversion of amplifier amplification subsequently, to realize signals collecting.Because the input voltage range and the precision of analog to digital converter are certain, the size of measuring-signal then may alter a great deal in practice, for guaranteeing the precision (mainly showing as signal to noise ratio (S/N ratio)) of signal measurement, need measure under different ranges.
In data acquisition equipment, in order to adapt to the size of measuring-signal, generally can suitable amplifier magnification ratio be set, thereby can realize the signal measurement (range=analog to digital converter input voltage range/enlargement factor) of different ranges according to the size of measured signal.Therefore in data acquisition equipment,,, thereby guarantee that signal can not transship for amplifier is provided with less enlargement factor with the bigger range of acquisition for bigger signal; And for less signal, then for the bigger enlargement factor of amplifier setting obtaining less range, thereby guarantee that signal can underload (being not the signal to noise ratio (S/N ratio) deficiency).
Yet, in existing data acquisition equipment, need the enlargement factor of artificially resonance-amplifier usually and can not automatically switch to suitable enlargement factor and range according to signal magnitude.Therefore, before the enlargement factor of amplifier is set, usually need rule of thumb, the size of method precognition measuring-signals such as preliminary experiment, simulation calculation, by the manual knob mode enlargement factor is set then.This mode causes data acquisition equipment can't carry out work automatically.
In addition, in existing data acquisition equipment, adopted modes such as software program control that enlargement factor is set.Though this control mode has reduced manual operation, still can't realize automatic range, all the more so for fast-changing Dynamic Signal.This is because amplifier belongs to electronic devices and components, all must just can reach stable through after a while after changing parameter.So in continuously real-time measuring process, if change the enlargement factor of amplifier, then reach in a period of time before stablizing, its measurement data is insecure.Therefore this control mode can't provide the signals collecting result with enough accuracy.
Therefore, needed be a kind of can be according to the signal magnitude automatic switching range, and can also guarantee the new data collection equipment and the collecting method of signal measurement precision.
Summary of the invention
In view of the above problems, the present invention has been proposed so that a kind of data acquisition equipment and collecting method that overcomes the problems referred to above or solve or slow down the problems referred to above at least in part is provided.
According to an aspect of the present invention, provide a kind of data acquisition equipment, comprised input end, be used to receive measuring-signal; A plurality of amplifiers, wherein each amplifier have different enlargement factors and be couple to the input bring in the reception measuring-signal, each amplifier amplifies the amplifying signal that has different amplification with output to the measuring-signal that is received respectively; A plurality of analog to digital converters, each analog to digital converter is couple to corresponding amplifier, so that the amplifying signal of respective amplifier output is carried out analog to digital conversion to obtain the digital amplifying signal through conversion; And controller, be couple to each analog to digital converter in a plurality of analog to digital converters receiving the digital amplifying signal from respective amplifier, its middle controller selects digital amplifying signal from one of a plurality of amplifiers as output signal according to the input voltage range of the size of measuring-signal and respective mode number converter.
Alternatively, in data acquisition equipment according to the present invention, the digital amplifying signal that the amplifier that controller selects to have size maximum, that can not cause measuring-signal and enlargement factor in the middle of a plurality of amplifiers product exceeds the enlargement factor of input voltage range is exported and changed via the respective mode number converter is as output signal.
Alternatively, in data acquisition equipment according to the present invention, a plurality of amplifiers comprise the single times of amplifier that measuring-signal is not amplified.
Alternatively, in data acquisition equipment according to the present invention, a plurality of amplifiers comprise 2 amplifiers, 3 amplifiers or 4 amplifiers, and a plurality of amplifier also comprises in 100 times of amplifiers, 10000 times of amplifiers and the 1000000 times of amplifiers one or more.
Alternatively, in data acquisition equipment according to the present invention, a plurality of analog to digital converters are 12,16 or 24 analog to digital converters.
According to another aspect of the present invention, a kind of collecting method that is suitable for acquired signal in data acquisition equipment is provided, this data acquisition equipment comprises input end, be couple to input end a plurality ofly have the amplifier of different amplification, a plurality of analog to digital converter and a controller, each analog to digital converter in wherein a plurality of analog to digital converters is coupled between one of described a plurality of amplifiers and the controller, and this collecting method comprises step: receive measuring-signal via described input end; By each amplifier in a plurality of amplifiers this measuring-signal is amplified simultaneously, and carry out analog to digital conversion, and amplifying signal after conversion, that have different amplification is input in the controller by corresponding analog to digital converter; And the product of selecting to have size maximum, that can not cause described measuring-signal and enlargement factor in described controller exceeds the digital amplifying signal of enlargement factor of input voltage range of respective mode number converter as output signal.
Break the thinking constraint of only gathering for a drive test amount signal originally according to data acquisition equipment of the present invention and method with an AD analog to digital converter, but use a plurality of AD analog to digital converters to sample synchronously to every drive test amount signal, and before each AD analog to digital converter, use to have difference but the amplifier of fixing enlargement factor amplifies, like this digital signal with regard to having obtained simultaneously under a plurality of ranges, measuring.Subsequently, the signal of the amplifier output of the maximum multiple of suitable this measuring-signal size of controller selection is as final acquired signal.Because controller only relates to the processing of carrying out at digital signal, and the components and parts in the analog signal transmission is not carried out any parameter change, so the present invention can select suitable range in real time, the data acquisition of realization automatic range when signal changes.
Description of drawings
By reading hereinafter detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing only is used to illustrate the purpose of preferred implementation, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts with identical reference symbol.In the accompanying drawings:
Fig. 1 shows the block diagram of data acquisition equipment according to an embodiment of the invention;
Fig. 2 shows the block diagram of the controller in the data acquisition equipment according to an embodiment of the invention; And
The collecting method that Fig. 3 shows according to an embodiment of the invention, is suitable for implementing in data acquisition equipment.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and concrete embodiment.Fig. 1 shows the block diagram of data acquisition equipment 100 according to an embodiment of the invention.As shown in Figure 1, data acquisition equipment 100 comprises input end 110, is used to receive measuring-signal.Measuring-signal is generally simulating signal.In the embodiment shown in fig. 1, show data acquisition equipment 100 and only receive a drive test amount signal, yet in practice, this data acquisition equipment 100 can receive the multichannel measurement signal.Because for every drive test amount signal, data acquisition equipment 100 has adopted similar treatment circuit to handle,, only show a drive test amount signal among Fig. 1 therefore for for purpose of brevity.But the present invention is not limited to this, but goes for handling simultaneously the multichannel measurement signal.
The present invention is not limited to the type of analog to digital converter, but the analog to digital converter of selecting to have higher figure place can obtain bigger automatic range scope.Usually analog to digital converter has types such as 12,16 and 24, be approximately 60dB, 80dB and 120dB respectively with the corresponding scope of measuring Dynamic Signal of these types, this is equivalent to about 1E3(1000 respectively) doubly, 1E4(10000) doubly and 1E6(1000000) doubly scope.Therefore select 24 analog to digital converters can be than the range ability of 1000 times of other two kinds of analog to digital converters acquisitions of Duo and 100 times.
Particularly, controller 140 at first selects tentatively to determine from the digital amplifying signal of the amplifier with minimum enlargement factor the size of measuring-signal, and the digital amplifying signal that the amplifier of enlargement factor that the product of selecting to have size maximum, that can not cause measuring-signal and enlargement factor then in the middle of a plurality of amplifiers exceeds the input voltage range of analog to digital converter is exported and changed via the respective mode number converter is as output signal.
As mentioned above, range=analog to digital converter input voltage range/enlargement factor.Owing to the analog to digital converter that adopts on every amplification path generally is identical, and the input voltage range of analog to digital converter is also corresponding to the output voltage range of data acquisition equipment 100, therefore, the selection that controller 140 is carried out also can be to use the amplifying signal of maximum range tentatively to determine the size of measuring-signal, the amplifying signal of minimum range of selecting to satisfy the measuring-signal size then is as output signal, promptly as final image data.
Fig. 2 shows the block diagram of the controller 140 in the data acquisition equipment 100 according to an embodiment of the invention.Controller 140 shown in Figure 2 is suitable for using in data acquisition equipment shown in Figure 1 100.As shown in Figure 2, controller 140 has three way word amplifying signals input 141
1, 141
2With 141
3, correspond respectively to single times of amplifier, 100 times of amplifiers and 10000 times of amplifying signals that amplifier is exported.Controller 140 comprises that also being coupled in three the tunnel respectively imports 141
1, 141
2With 141
3And the gating circuit 143 between the controller output 144
1, 143
2With 143
3Gating circuit 143
1, 143
2With 143
3Controlled by control module 142, particularly, respectively by gating signal 145 from control unit 142
1, 145
2With 145
3Gating is so that export 144 with corresponding amplifying signal input and output to controller.
On the contrary, if digital signal 141
1Greater than with 10000 times of corresponding ranges of amplifier, then then by second judging unit 142
2Judge this digital signal 141
1Whether less than with 100 times of corresponding ranges of amplifier, if then enable gating signal 145
2So that gating circuit 143
2By gating, thereby will output to output terminal 144 from the digital amplifying signal after analog to digital conversion of 100 times of amplifiers.
On the contrary, if digital signal 141
1Greater than with 100 times of corresponding ranges of amplifier, then enable gating signal 145
1So that gating circuit 143
1By gating, thereby will output to output terminal 144 from the digital amplifying signal after analog to digital conversion of single times of amplifier.
Though Fig. 2 is that example is illustrated with the controller 140 that is suitable for three amplifiers, but those skilled in the art can be expressly understood that according to example shown in Figure 2 can make amendment to this controller 140 can not exceed scope of the present invention so that be suitable for the controller of different numbers and enlargement factor.
Particularly, controller 140 is according to the enlargement factor order from high to low of a plurality of amplifiers, judge successively whether the product of the size of measuring-signal and this enlargement factor exceeds the output voltage range of data acquisition equipment, if do not exceed, then select from the corresponding amplifier of this enlargement factor and via the digital amplifying signal of respective mode number converter conversion as output signal.
Fig. 3 shows according to an embodiment of the invention, is suitable for the collecting method 300 of enforcement in data acquisition equipment according to the present invention (data acquisition equipment for example shown in Figure 1).This method is suitable for step S310, wherein receives measuring-signal via described input end.Subsequently, in step S320, utilize many amplification paths that this measuring-signal is handled simultaneously.Because every the amplification path comprises amplifier and corresponding analog to digital converter, therefore in step S320, by corresponding amplifier measuring-signal is amplified, and carry out analog to digital conversion, and digital amplifying signal after conversion, that have different amplification is input in the controller by corresponding analog to digital converter.At last in step S340, the product of selecting to have size maximum, that can not cause measuring-signal and enlargement factor in controller exceeds the digital amplifying signal of enlargement factor of input voltage range of respective mode number converter as output signal, promptly in controller, selection can be satisfied the digital amplifying signal of minimum range of measuring-signal size as output signal, promptly as final image data.
Can be automatically switch on the suitable range according to data acquisition equipment of the present invention and collecting method, and can satisfy signal dynamics variation range up to 160dB, 200dB or 240dB according to the size of measured signal.By when the very big signal of dynamic change especially variation range is measured, need not to consider signal magnitude and range problem, just can guarantee the fiduciary level and the precision of signal measurement.
Should be noted that, in each parts of controller of the present invention especially control module, according to its function that will realize and wherein parts have been carried out logical partitioning, but, the present invention is not subject to this, can repartition or make up each parts as required, for example, can be single parts with some unit constructions, perhaps some parts further can be decomposed into more subassembly.
Each controller embodiment of the present invention can realize with hardware, perhaps realizes with the software module of moving on one or more processor, and perhaps the combination with them realizes.It will be understood by those of skill in the art that and to use microprocessor or digital signal processor (DSP) or FPGA to realize in practice according to some or all some or repertoire of parts in the controller of the embodiment of the invention.
It should be noted the foregoing description the present invention will be described rather than limit the invention, and those skilled in the art can design alternative embodiment under the situation of the scope that does not break away from claims.In the claims, any reference symbol between bracket should be configured to restriction to claim.Word " comprises " not to be got rid of existence and is not listed in element or step in the claim.Being positioned at word " " before the element or " one " does not get rid of and has a plurality of such elements.The present invention can realize by means of the hardware that includes some different elements and by means of the computing machine of suitably programming.In having enumerated the unit claim of some devices, several in these devices can be to come imbody by same hardware branch.Any order is not represented in the use of word first, second and C grade.Can be title with these word explanations.
Claims (9)
1. data acquisition equipment comprises:
Input end is used to receive measuring-signal;
A plurality of amplifiers, wherein each amplifier have different enlargement factors and be couple to the input bring in the reception measuring-signal, each amplifier amplifies the amplifying signal that has different amplification with output to the measuring-signal that is received respectively;
A plurality of analog to digital converters, each analog to digital converter are couple to the respective amplifier in described a plurality of amplifier, so that the amplifying signal of respective amplifier output is carried out analog to digital conversion to obtain the digital amplifying signal through conversion; And
Controller, be couple to each analog to digital converter in described a plurality of analog to digital converter receiving digital amplifying signal from respective amplifier output, wherein said controller according to the input voltage range of the size of described measuring-signal and respective mode number converter select from the output of one of described a plurality of amplifiers and via the digital amplifying signal of respective mode number converter conversion as output signal.
2. data acquisition equipment as claimed in claim 1, wherein said controller select to have size maximum, that can not cause described measuring-signal and enlargement factor in the middle of described a plurality of amplifiers product exceed described input voltage range enlargement factor amplifier output and via the digital amplifying signal of respective mode number converter conversion as output signal.
3. data acquisition equipment as claimed in claim 2, wherein said controller is according to the enlargement factor order from high to low of described a plurality of amplifiers, judge successively whether the size of described measuring-signal and the product of this enlargement factor exceed described input voltage range, if do not exceed, then select with the corresponding amplifier output of this enlargement factor and via the digital amplifying signal of respective mode number converter conversion as output signal.
4. as any described data acquisition equipment among the claim 1-3, wherein said a plurality of amplifiers comprise the single times of amplifier that described measuring-signal is not amplified.
5. data acquisition equipment as claimed in claim 4, wherein said a plurality of amplifiers comprise 2 amplifiers, 3 amplifiers and 4 amplifiers.
6. data acquisition equipment as claimed in claim 4, wherein said a plurality of amplifiers also comprise one or more in 100 times of amplifiers, 10000 times of amplifiers and the 1000000 times of amplifiers.
7. as any described data acquisition equipment among the claim 1-3, wherein said a plurality of analog to digital converters are 12,16 or 24 analog to digital converters.
8. data acquisition equipment as claimed in claim 7, wherein said a plurality of analog to digital converters have identical type.
9. collecting method that is suitable for acquired signal in data acquisition equipment, this data acquisition equipment comprises input end, be couple to input end a plurality ofly have the amplifier of different amplification, a plurality of analog to digital converter and a controller, each analog to digital converter in wherein a plurality of analog to digital converters is coupled between one of described a plurality of amplifiers and the controller, and this collecting method comprises step:
Receive measuring-signal via described input end;
By each amplifier in a plurality of amplifiers this measuring-signal is amplified simultaneously, and carry out analog to digital conversion, and digital amplifying signal after conversion, that have different amplification is input in the controller by corresponding analog to digital converter; And
The product of selecting to have size maximum, that can not cause described measuring-signal and enlargement factor in described controller exceeds the digital amplifying signal of enlargement factor of input voltage range of described respective mode number converter as output signal.
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| CN2011101318427A CN102297703A (en) | 2011-05-20 | 2011-05-20 | Data collection equipment and method thereof |
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| CN2011101318427A CN102297703A (en) | 2011-05-20 | 2011-05-20 | Data collection equipment and method thereof |
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Cited By (5)
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| CN106712774A (en) * | 2016-09-30 | 2017-05-24 | 珠海思创电气有限公司 | High-precision analog signal sampling circuit |
| CN107942170A (en) * | 2017-11-30 | 2018-04-20 | 深圳市新国都支付技术有限公司 | One kind charging detection device |
| CN108120498A (en) * | 2017-12-21 | 2018-06-05 | 威胜电气有限公司 | The binary channels input signal synthetic method of for transformer acoustics on-line monitoring |
| CN108306645A (en) * | 2018-01-19 | 2018-07-20 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Sensor digital collection capacity acquisition methods, apparatus and system |
| CN112269083A (en) * | 2020-10-20 | 2021-01-26 | 江苏新安电器股份有限公司 | Control panel voltage detection and conversion device for automatic test equipment |
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| CN112269083A (en) * | 2020-10-20 | 2021-01-26 | 江苏新安电器股份有限公司 | Control panel voltage detection and conversion device for automatic test equipment |
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Application publication date: 20111228 |