CN102466745A - Digital universal meter for displaying measurement result by using waveform - Google Patents
Digital universal meter for displaying measurement result by using waveform Download PDFInfo
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- CN102466745A CN102466745A CN201010534702XA CN201010534702A CN102466745A CN 102466745 A CN102466745 A CN 102466745A CN 201010534702X A CN201010534702X A CN 201010534702XA CN 201010534702 A CN201010534702 A CN 201010534702A CN 102466745 A CN102466745 A CN 102466745A
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Abstract
The invention discloses a digital universal meter for displaying a measurement result by using a waveform. The digital universal meter is provided with a measurement unit, a display unit and a control unit, wherein the display unit comprises a tendency waveform display unit (11) and a real-time waveform display unit (13) which are arranged transversely and adjacent with each other closely. When a compression condition of real-time waveform displayed data is met, the real-time waveform displayed data is converted to be a part of tendency waveform displayed data by using a dynamic compression ratio; and when a compression condition of the tendency waveform displayed data is met, the tendency waveform displayed data is compressed by using a fixed compression ratio, so the dynamic compression ratio is increased. The digital universal meter can execute a large number of measurement tasks for long time; furthermore, the waveform of a current measurement signal can be displayed in real time by using a real-time waveform curve (L), and a blind area is avoided; moreover, a user can learn about the change tendency of the current measurement signal through a tendency waveform curve (E) to forecast a future measurement result.
Description
Technical field
A kind of digital versatile with waveform demonstration measurement result of the present invention relates to electric variable measurement device field, particularly relates to the digital multimeter field that can show measured value with waveform.
Background technology
As everyone knows; Digital multimeter is mainly used in carries out voltage measurement, current measurement and resistance measurement; The digital multimeter that has can also be used for electric capacity, inductance, diode measurement, or also comprises the measurement of physical quantitys such as temperature, pressure, humidity, speed or acceleration, the digital multimeter that has even can also be as the data acquisition system (DAS) of using always; Can regularly carry out measuring task, as, regularly collect and show the measurement data that is collected.
Digital multimeter shows that the method for measurement result has multiple; Wherein to use method that digital form representes measurement result for the most common; But this method is only applicable to show instant measurement data, promptly shows current measured value, or the calculated value of measurement result; Like mean value, maximal value, minimum value, mean square deviation etc., can not represent the change procedure that measured value experiences.Such as, when utilizing multimeter to carry out the fixed time temperature measuring task, when obtaining hundreds of temperature measuring data, or when utilizing multimeter in very short time, to accomplish repeatedly voltage measurement, all can't clearly demonstrate each measurement result with digital form.As everyone knows, the best way that shows such cumulative measurement result is to adopt the waveform display mode, but the conventional waveform display mode can't well be applied to digital multimeter.
Title Method of displaying continuously acquired data as multiple traces on afixed length display; Patent No. US5684508; Be the United States Patent (USP) of U.S. Fiuke Co., Ltd application, it has just disclosed a kind of measurement mechanism and method for displaying waveform thereof that utilizes waveform to show measuring-signal.
The content that is disclosed according to this patent US5684508; As shown in Figure 1; This measurement mechanism can corresponding each measuring-signal that collects; Light the pixel of a correspondence on the display screen, thereby after collecting one group of measuring-signal, can on display screen, form one and the corresponding waveform M1 of described one group of measuring-signal.Waveform M1 on display screen reaches extension position T all over the screen, and when forming display frame p1, waveform M1 half-and-half is compressed into waveform L1, and L1 is presented on the display frame p2.
After this, when collecting new measuring-signal once more, this measurement mechanism can at first carry out 2 to measuring-signal and select 1 decimation operation, or to be called compressibility be 2 to 1 squeeze operation, and last, the measuring-signal correspondence that will select out again is shown as waveform M2.When the waveform M2 on the display screen arrives extension position T all over the screen once more, again waveform L1 on the display screen and M2 are carried out double compression,, on display frame P3, form new waveform L2.
After this, when collecting new measuring-signal once more, measurement mechanism can carry out 4 to measuring-signal at first and select 1 decimation operation, and the measuring-signal correspondence that will select out again is shown as waveform M3.Constantly repeat the construction process of this waveform then.
Above-mentioned method for displaying waveform relatively is fit to be applied to have the digital oscilloscope of large screen display ability, not too is suitable for digital multimeter.Because the characteristics of multimeter are that the data volume of measuring-signal is big, Measuring Time is longer, and display screen is less relatively.If show the waveform of measuring-signal in real time with the method for the compression ratio that strengthens measuring-signal; Such as; Very big one section measurement data is only extracted and shows the method for 1 measurement data,, can make the user simultaneously in very long one section measuring process though can show the overall variation trend of these measuring-signals; Can't understand the situation of change of up-to-date measuring-signal, the sensation that is in " blind area " is arranged.
In order to remedy above-mentioned defective, above-mentioned method for displaying waveform has been set the upper limit to the compressibility of measuring-signal, in case this compressibility reaches in limited time, just makes one section waveform of the current real-time measurement situation of reflection on the display screen get into the roll display mode.No longer increase the compressibility of this section waveform.But in fact, waveform roll display mode also can be introduced new problem, such as, it can cause loss of data, makes the user can't observe the waveform of the variation tendency that can reflect whole measurement data situation.
Summary of the invention
The objective of the invention is to, solve the problem that prior art exists, a kind of digital multimeter that shows measurement result with waveform is provided.
A kind of digital multimeter that shows measurement result with waveform of the present invention; Have measuring unit, display unit and control module; Described measuring unit is used to produce measurement data; Described control module is used for producing a real-time waveform video data and a trend waveform video data according to described measurement data
Described display unit comprises the trend waveform display unit and the real-time waveform display unit that is used for waveform mode showing real-time wave video data that are used for showing with the waveform mode trend waveform video data, described trend waveform display unit and real-time waveform display unit horizontally set and next-door neighbour;
Described control module also is used to judge whether to satisfy the contractive condition of a real-time waveform video data; When satisfying the contractive condition of described real-time waveform video data; Utilize a ram ratio, described real-time waveform video data is converted into the part of described trend waveform video data;
Described control module also is used to judge whether to satisfy the contractive condition of a trend waveform video data; When satisfying the contractive condition of described trend waveform video data; Utilize a fixedly ratio of compression, compress described trend waveform video data and increase described ram ratio.
According to one embodiment of present invention, the contractive condition of the real-time waveform video data of digital multimeter of the present invention can be that the data volume of described real-time waveform video data reaches one first predetermined value;
The contractive condition of described trend waveform video data is that the data volume of described real-time waveform video data reaches one second predetermined value, and the data volume of described trend waveform video data is when reaching one the 3rd predetermined value.
According to one embodiment of present invention, described second predetermined value can be for greater than 1, and less than described first predetermined value.
According to one embodiment of present invention, described fixedly ratio of compression can be for 2 to 1.
According to one embodiment of present invention, the initial value of described ram ratio can be for 2 to 1.
According to still another embodiment of the invention; Described control module also is used to calculate the amplitude range of described measurement data; When the amplitude of a new measurement data surpasses original amplitude range; Described control module is confirmed a new amplitude range again according to described new measurement data, and to refreshing described real-time waveform video data and trend waveform video data by new amplitude range.
Utilize digital multimeter of the present invention; The user can observe more Useful Informations at one time; Directly grasp current measured value; Be of value to the user current measurement data is compared with historical data, understand the variation tendency of current measured value, help the user measurement result in future is predicted with respect to the measured value in past.And even under the situation of a large amount of measuring task of long-time execution, the user still can pass through the real-time waveform display unit, understands the waveform state of current signal of catching in real time, " blind area " can not occur.
The present invention has simplicity of design, is convenient to the characteristics that the user observes, and can be widely used in various types of digital multimeter.
Description of drawings
Shown in Figure 1 is the key diagram of method for displaying waveform of the prior art.
The circuit structure block diagram of the digital multimeter of selecting for use for preferred embodiment of the present invention 1 shown in Figure 2.
Shown in Figure 3 is the display unit 11 and display unit 12 key diagrams of digital multimeter 1.
The process flow diagram of selecting waveform demonstration controlled step 100 for 1 of digital multimeter for use shown in Figure 4.
Shown in Figure 5 is the key diagram that calculates the horizontal ordinate position of Waveform display signal A.
Shown in Figure 6 is the step key diagram that calculates the ordinate position of described Waveform display signal A.
Fig. 7 a, 7b----7h are depicted as waveform and show when controlled step 100 is moved continuously the show state key diagram of display unit 11 and display unit 12.
Embodiment
In order to further specify a kind of digital multimeter of the present invention,, specify the preferred embodiment that the present invention selected for use below in conjunction with accompanying drawing with waveform demonstration measurement result.
In the present embodiment, digital multimeter 1 can be used for measuring DC voltage, DC current, alternating voltage, alternating current, resistance and electric capacity.
As illustrating, in this enforcement, multimeter 1 also can be selected the digital multimeter with less measurement function for use, such as the multimeter that only has the voltage and current measurement function.
Illustrate as another, multimeter 1 also can be selected for use has more measurement function digital multimeter, such as having " on off test ", diode test function, inductance measurement function etc.
Illustrate as another; When utilizing temperature sensor to change temperature signal into electric signal or resistance value; Multimeter 1 can also be accomplished temperature signal measurement by the measurement capability of electric signal or resistance signal of self, and described sensor can be thermistor or thermopair.When connecting sensors of various types for multimeter 1, multimeter 1 can also be used to accomplishing tests such as pressure, speed and acceleration.
In the present embodiment; Metering circuit 2 is used to insert measured signal Vi and the measured signal Vi that imports is carried out signal condition; So that meet the measurement range of analog to digital conversion circuit 3; Described signal arrangement can also comprise the part of operations such as signal amplification, denoising, decay, filtering, frequency compensation, amplitude compensation, over-voltage over-current protection, calibration, conversion of signals or all, wherein said conversion of signals operation comprises the map function of alternating current-direct current signal.
In the present embodiment, analog to digital conversion circuit 3 is made up of the A/D device, and being used for the analog signal conversion that receives is digital signal.
In the present embodiment, for the ease of high speed, high bandwidth or high-precision signal measurement, analog to digital conversion circuit 3 also can be to be connected and composed by multi-disc A/D device.
In the present embodiment, control circuit 4 can also be used for its measuring-signal of catching and described video data are kept at storer 5, is used to consult or data processing.
In the present embodiment, control circuit 4 can also be connected with user's input block, and control circuit 4 also is used for the steering order through described input block input according to the user, makes multimeter 1 carry out corresponding operation.Described user's input block can be the input equipment of button, mouse, touch-screen or other types.
In the present embodiment; Control module 4 is carried out has one to measure controlled step, is used to make metering circuit 2 to carry out regularly measuring task, such as; Make metering circuit 2 every interval 50ms carry out a voltage measurement or temperature survey; And make analog to digital conversion circuit 3 carry out data translation tasks, the analog signal conversion of metering circuit 2 outputs is digital signal after, be kept in the storer 5.
In the present embodiment, have two display units on the display screen 6 of multimeter 1, referring to Fig. 3, one is that 11, one of trend waveform display units that are used to appear the trend waveform are the real-time waveform display units 12 that is used for showing real-time wave.The transverse axis X of two display units 11,12 is all identical with the pixel of longitudinal axis Y direction, and two display units 11,12 are tightly continuous.
In the present embodiment, the transverse axis X of described display screen 6 and the pixel of longitudinal axis Y are 256*64, and display unit 11,12 sizes are identical, and the pixel of its transverse axis X and longitudinal axis Y is 128*54 respectively.
Illustrate as another, the transverse axis X of described display screen 6 and the pixel of longitudinal axis Y also can be greater or lesser.
The display screen 6 of present embodiment adopts monochromatic LCD material, and as illustrating, display screen 6 also can be selected monochromatic LCD or the color LCD with gray scale display capabilities for use, and display screen 6 also can select for use other materials to make.
In the present embodiment, in conjunction with referring to Fig. 2,3,4, control module 4 is also carried out a waveform and is shown controlled step 100.Should, waveform shows that controlled step 100 is used to catch the measuring-signal of analog to digital conversion circuit 3 outputs and on display screen 6, present this measuring-signal with the waveform display mode.
In the present embodiment, described measurement controlled step and waveform show that controlled step 100 is two and independently controls thread, can be under the control of control module 4, and the difference independent operating.
As illustrating; For measuring speed is not under the very fast situation; Described measurement controlled step and waveform show that controlled step 100 also can not adopt the mode of separate threads, such as whenever after the measurement controlled step collects a measurement data, just to waveform demonstration controlled step 100 these measurement data of transmission; Waveform shows controlled step 100 whenever after having shown a pairing Waveform display signal of measurement data, with regard to etc. the new measurement data of controlled step transmission to be measured.
In the present embodiment, waveform shows that controlled step 100 comprises controlled step successively:
Real time data receiving step 101:
In this step, control module 4 at first receives a new measuring-signal from described analog to digital conversion circuit 3, then, converts this measuring-signal into Waveform display signal, and is last, makes display unit 12 present the Waveform display signal that all have obtained.After executing described real time data receiving step 101, carry out determining step 102.
As illustrating,, when converting measuring-signal into Waveform display signal, can also comprise and carry out following signal Processing step in control module 4 executive real-time Data Receiving steps 101:
1, step of calculating the horizontal ordinate position of Waveform display signal.Referring to Fig. 5, promptly, the step of the location of pixels of the horizontal ordinate x direction of calculating and the described new corresponding Waveform display signal A of measuring-signal, by way of example; If; On display unit 12, there is the Waveform display signal B in a Geju City, when the location of pixels of its horizontal ordinate x direction is M; Then, the location of pixels of setting the horizontal ordinate x direction of the pairing Waveform display signal A of this new measuring-signal is M+1.
If when this new measuring-signal was first measuring-signal, promptly on display unit 12, when not having old Waveform display signal, the location of pixels of the pairing Waveform display signal of this new measuring-signal was exactly the position S at first pixel place of horizontal ordinate x direction.
2, step of calculating the ordinate position of Waveform display signal.
When to new measuring-signal; When having a Geju City measuring-signal; Then also will this new measuring-signal and the maximal value and the minimum value of other measuring-signals that formerly show compare; In the time of in described new measuring-signal drops on described maximal value and minimum value scope; With regard to first pixel on the ordinate Y direction that accordings to the corresponding display unit 12 of described minimum value, the corresponding relation of the maximum pixel on the ordinate Y direction of the corresponding display unit 12 of maximal value, the pixel position of the ordinate direction of calculating and this Waveform display signal.
In the time of beyond described new measuring-signal is in described maximal value and minimum value institute restricted portion; Just utilize described new measuring-signal to revise described maximal value and minimum value; Such as; When described new measuring-signal during, just make described maximal value equal described new measuring-signal greater than described maximal value.Again such as, when described new measuring-signal during, just make described minimum value equal described new measuring-signal less than described minimum value.Then; Utilize first pixel on the ordinate direction of the corresponding display unit 12 of described minimum value again; The corresponding relation of the maximum pixel on the ordinate direction of the corresponding display unit 12 of maximal value; Recomputate the location of pixels of all whole Waveform display signals, the whole Waveform display signals of described here all comprise the pairing shows signal of this new measuring-signal and other all Waveform display signals that formerly show.
As illustrating, in conjunction with reference to figure 2,3,6, real time data receiving step 101 also can comprise following concrete treatment step,
Step 201: control module 4 at first receives a new measuring-signal from described analog to digital conversion circuit 3.
Step 202: according to the sequencing of measuring-signal, in display unit 12, for the corresponding Waveform display signal of said measuring-signal is set the horizontal ordinate position.
In originally illustrating; The horizontal ordinate x direction of display unit 12 corresponding the sequencing of measuring-signal; Therefore; The horizontal ordinate x axle of described display unit 12 can be called time shaft again, when calculating the horizontal ordinate x of the pairing Waveform display signal of each measuring-signal, as long as number just passable according to the sequencing of measurement point.
In originally illustrating, the pairing Waveform display signal of first measuring-signal begins picture from first pixel of display unit 12, and order adds 1 and shows the pairing Waveform display signal of other measuring-signals that obtain then.
Step 203: according to described new measuring-signal, the maximal value MAX of cumulative calculation measuring-signal and minimum value MIN promptly, are carried out statistical calculation to the whole measuring-signals that obtain, and obtain wherein maximal value MAX and minimum value MIN.
Step 204: judge, judge that current maximal value MAX and minimum value MIN are than changing in the past? When maximal value MAX and the minimum value MIN of accumulative total measuring-signal do not change, the direct execution in step 206 of next step; When; Because described new measuring-signal is when changing described maximal value MAX and minimum value MIN, then; Elder generation's execution in step 205, execution in step 206 again
Step 205: structure STEP value
Maximum pixel according to the short transverse of maximal value MAX and the minimum value MIN and the display unit 12 of accumulative total measuring-signal is counted STEP value of HIGHT calculating.Make STEP=(MAX-MIN)/HIGHT.
When measuring-signal is first measuring-signal, can preestablish a maximal value or minimum value, such as when described first measuring-signal be on the occasion of the time, can this measuring-signal be made as maximal value, zero voltage value is set at minimum value.When being negative value such as measuring-signal again, can this measuring-signal be made as minimum value, zero voltage value is set at maximal value, thereby calculates the STEP value.
Step 206: utilize formula (MAX-VALUE)/STEP, calculate the ordinate value of the pairing Waveform display signal of measured value VALUE of all measuring-signals.
In the present embodiment, 0 on the coordinate of the coordinate system that is adopted is on the upper left side of display unit 12, can utilize formula (MAX-MAX)/STEP to calculate the corresponding ordinate of maximal value MAX of measuring-signal, and its coordinate=0 is same; Also can utilize formula (MAX-MIN)/STEP to obtain the pairing ordinate of minimum value MIN, the maximum pixel of the short transverse of this ordinate=display unit 12 is counted HIGHT.
In this step, when, when described maximal value and minimum value do not change, then, directly utilize formula (MAX-VALUE)/STEP to calculate the ordinate value of the pairing Waveform display signal of measured value VALUE of described new measuring-signal.When described maximal value and minimum value change, and display unit 12 then, recomputate the ordinate value of all Waveform display signals according to this formula (MAX-VALUE)/STEP with 11 pairs of display units other Waveform display signals should be arranged the time.
Illustrate as another, when adopting the different coordinate systems system,, also can adopt other formula to calculate the ordinate value of the pairing Waveform display signal of each measuring-signal under the prerequisite of spirit of the present invention.In the situation of lower left, can utilize the difference of measured value VALUE of minimum M IX and the measuring-signal of measured value to calculate the ordinate value of described Waveform display signal such as, true origin.
Step 207: with the coordinate figure of each Waveform display signal, comprise that ordinate value and abscissa value deposit among the memory buffer BUFFER of display screen 6, be used for presenting the pairing Waveform display signal of described new measuring-signal at display unit 12.
In the present embodiment, when display unit 12 presents the pairing Waveform display signal of described new measuring-signal, can also at first carry out a cls operation at every turn, then, show described all whole Waveform display signals again.
In the present embodiment, when display unit 12 presents the pairing Waveform display signal of described new measuring-signal, also discrete shows signal is connected into squiggle with connection mode at every turn.Described connection mode has multiple, in the present embodiment, is to utilize the default function GUI_DrawLine (intx0, int y0, int x1, int y1) among the software ucGUI that discrete shows signal is connected into squiggle.
Determining step 102:
Determining step 102 is carried out following operation, in conjunction with reference to figure 2,3,4:
1, judges in the display unit that whether the Waveform display signal in 12 has arrived last row locations of pixels T, judges promptly whether display unit 12 has drawn full real-time waveform curve L.
2, judge in the display unit whether the Waveform display signal in 11 has arrived last row locations of pixels K; And; Whether the Waveform display signal in the display unit in 12 has arrived a predetermined location of pixels D; Promptly, judge whether drawn full trend squiggle E in the display unit 11, and the real-time waveform curve L in the display unit 12 has also arrived predetermined location of pixels D.
During any Rule of judgment in not satisfying above-mentioned two Rule of judgment, waveform shows that controlled step 100 returns executive real-time Data Receiving step 101.
Otherwise,
When; Waveform display signal in the display unit in 12 has arrived last row locations of pixels T, promptly judges when display unit 12 has been drawn full squiggle L, then; Think the contractive condition that satisfies the real-time waveform video data, control module 4 beginning executive real-time data compression steps 103.
In real time data compression step 103, control module 4 utilizes a ram ratio, with the Waveform display signal boil down to trend Waveform display signal in the display unit 12, and these trend Waveform display signals is presented in the trend waveform display unit 11.After executing described real time data compression step 103, waveform demonstration controlled step 100 is returned executive real-time Data Receiving step 101.
When the Waveform display signal in 11 in the display unit has arrived last row locations of pixels K, and the Waveform display signal in the display unit 12 has arrived a predetermined location of pixels D; Promptly; Drawn full trend squiggle E in the display unit 11, and the real-time waveform curve L in the display unit 12 has also arrived predetermined location of pixels D; Then think the contractive condition that satisfies a compressed waveform video data, control module 4 begins to carry out packed data compression step 104.
In packed data compression step 104, control module 4 utilizes a fixedly ratio of compression, the trend Waveform display signal that shows in the display unit 11 is compressed, and replace original trend Waveform display signal with the trend Waveform display signal after the compression.Simultaneously, also, described ram ratio is adjusted, increased described ram ratio according to described fixedly ratio of compression.
After executing described packed data compression step 104, waveform demonstration controlled step 100 is returned executive real-time Data Receiving step 101.
In the present embodiment, when display unit 11 presents described trend Waveform display signal, can also at first carry out a cls operation at every turn, then, show described all whole trend Waveform display signals again.
In the present embodiment, when display unit 11 presents the pairing Waveform display signal of described new measuring-signal, also discrete shows signal is connected into squiggle with connection mode at every turn.Described connection mode has multiple, in the present embodiment, is to utilize the default function GUI DrawLine (intx0, int y0, int x1, int y1) among the software ucGUI that discrete shows signal is connected into squiggle.
Embodiment for a better understanding of the present invention shows controlled step 100 situation of operation continuously below in conjunction with the careful waveform that illustrates of Fig. 7 a, 7b-7h:
With reference to figure 2,4,7a; When beginning executive real-time Data Receiving step 101; Control module 4 can constantly receive new measuring-signal from analog to digital conversion circuit 3, and converts the measuring-signal that receives into Waveform display signal, and L1 is presented in the display unit 12 with the real-time waveform curve.
When display unit 12 has been drawn full real-time waveform curve L1, that is, when real-time waveform curve L1 arrived last row locations of pixels T of display unit 12, control module 4 can be according to the judged result of determining step 102, executive real-time data compression step 103.
In real time data compression step 103; Control module 4 utilizes described ram ratio; The pairing Waveform display signal boil down to of real-time waveform curve L1 trend Waveform display signal with in the display unit 12 is presented on described trend Waveform display signal in the trend waveform display unit 11 with trend squiggle E1.
Because in the present embodiment; The initial value of this ram ratio was set to 2: 1; Therefore; When for the first time the compression of the real-time waveform curve L1 in the display unit 12 being shown as in the display unit 11 trend squiggle E1, the length of trend squiggle E1 be real-time waveform curve L1 length 1/2.
With reference to figure 2,4,7b, after executing above-mentioned real time data compression step 103, waveform demonstration controlled step 100 will be returned executive real-time Data Receiving step 101.Control module 4 can receive new measuring-signal from analog to digital conversion circuit 3 with keeping, and converts the measuring-signal that receives into Waveform display signal, and L2 is presented in the display unit 12 with the real-time waveform curve.
When display unit 12 is drawn full real-time waveform curve L2 once more; Promptly; When real-time waveform curve L2 arrives last row locations of pixels T of display unit 12 once more, control module 4 can be once more according to the judged result of determining step 102, executive real-time data compression step 103.
In real time data compression step 103; Control module 4 utilizes above-mentioned ram ratio; The pairing Waveform display signal boil down to of real-time waveform curve L2 trend Waveform display signal with in the display unit 12 is presented on described trend Waveform display signal in the trend waveform display unit 11 with trend squiggle E2.
Because in the present embodiment; At this moment ram ratio is 2: 1; Therefore, when the real-time waveform curve L2 in the display unit 12 compression is shown as in the display unit 11 trend squiggle E2, the length of trend squiggle E2 be real-time waveform curve L2 length 1/2.
Waveform is to be connected to form in regular turn by trend squiggle E1 and trend squiggle E2 in the display unit 11; And; The waveform of being made up of trend squiggle E1 and trend squiggle E2 has been full of display unit 11; That is the waveform that, trend squiggle E1 in 11 and trend squiggle E2 form in the display unit has arrived last row locations of pixels K of display unit 11.
With reference to figure 2,4,7c, after executing above-mentioned real time data compression step 103, waveform demonstration controlled step 100 will be returned executive real-time Data Receiving step 101 once more.Control module 4 can receive new measuring-signal from analog to digital conversion circuit 3 with keeping, and converts the measuring-signal that receives into Waveform display signal, and L3 is presented in the display unit 12 with the real-time waveform curve.
Waveform display signal in display unit 12 arrives predetermined location of pixels D; Promptly, picture has been expired the waveform that is made up of trend squiggle E1 and trend squiggle E2 in the display unit 11; And; When real-time waveform curve L3 arrived location of pixels D, control module 4 can be carried out packed data compression step 104 according to the judged result of determining step 102.
In packed data compression step 104; Control module 4 utilizes a fixedly ratio of compression; Trend Waveform display signal to showing in the display unit 11 compresses, and the waveform that is made up of trend squiggle E1 and trend squiggle E2 in the display unit 11 is compressed is shown as trend squiggle E3.
Because in the present embodiment, fixedly ratio of compression is elected 2: 1 as, therefore, the length of compressing the trend squiggle E3 of back formation is the half the of the preceding waveform length of compression.
In packed data compression step 104, control module 4 also doubles the present dynamic ratio of compression, forms new ram ratio.That is, make described ram ratio, be adjusted into 4: 1 by initial value 2: 1.
With reference to figure 2,4,7d, after executing above-mentioned packed data compression step 104, waveform demonstration controlled step 100 will be returned executive real-time Data Receiving step 101.Control module 4 can receive new measuring-signal from analog to digital conversion circuit 3 with keeping, and converts the measuring-signal that receives into Waveform display signal, continues with real-time waveform curve L3 described Waveform display signal to be presented in the display unit 12.
When display unit 12 is drawn full real-time waveform curve L3 once more, that is, when real-time waveform curve L3 arrives last row locations of pixels T of display unit 12, control module 4 can be once more according to the judged result of determining step 102, executive real-time data compression step 103.
In real time data compression step 103; Control module 4 utilizes adjusted ram ratio; The pairing Waveform display signal boil down to of real-time waveform curve L3 trend Waveform display signal with in the display unit 12 is presented on described trend Waveform display signal in the trend waveform display unit 11 with trend squiggle E4.
Because in the present embodiment; This ram ratio was adjusted to 4: 1; Therefore; When control module 4 is shown as in the display unit 11 trend squiggle E4 with the real-time waveform curve L3 in the display unit 12 compression, the length of trend squiggle E4 be real-time waveform curve L3 length 1/4.At this moment, the waveform in the display unit 11 is to be connected to form in regular turn by trend squiggle E3 and trend squiggle E4.
With reference to figure 2,4,7e, after executing real time data compression step 103, waveform demonstration controlled step 100 will be returned executive real-time Data Receiving step 101 once more.Control module 4 can receive new measuring-signal from analog to digital conversion circuit 3 with keeping, and converts the measuring-signal that receives into Waveform display signal, and L4 is presented in the display unit 12 with the real-time waveform curve.
When display unit 12 is drawn full real-time waveform curve L4 once more, that is, when real-time waveform curve L4 arrives last row locations of pixels T of display unit 12, control module 4 can be once more according to the judged result of determining step 102, executive real-time data compression step 103.
In real time data compression step 103; Control module 4 utilizes above-mentioned adjusted ram ratio; The pairing Waveform display signal boil down to of real-time waveform curve L4 trend Waveform display signal with in the display unit 12 is presented on it in trend waveform display unit 11 with trend squiggle E5.
Because in the present embodiment; This ram ratio was adjusted to 4: 1; Therefore; When control module 4 is shown as in the display unit 11 trend squiggle E5 with the real-time waveform curve L4 in the display unit 12 compression, the length of trend squiggle E5 be real-time waveform curve L4 length 1/4.At this moment, the waveform in the display unit 11 is to be connected to form in regular turn by trend squiggle E3, trend squiggle E4 and trend squiggle E5.And; The waveform that is connected to form in regular turn by trend squiggle E3, trend squiggle E4 and trend squiggle E5 has been full of display unit 11; That is, the waveform that is connected to form in regular turn by trend squiggle E3, trend squiggle E4 and trend squiggle E5 in 11 has arrived last row locations of pixels K of display unit 11 in the display unit.
With reference to figure 2,4,7f, after executing above-mentioned real time data compression step 103, waveform demonstration controlled step 100 will be returned executive real-time Data Receiving step 101 once more.Control module 4 can receive new measuring-signal from analog to digital conversion circuit 3 with keeping, and converts the measuring-signal that receives into Waveform display signal, and L5 is presented in the display unit 12 with the real-time waveform curve.
Waveform display signal in display unit 12 arrives predetermined location of pixels D; Promptly, picture has been expired the waveform that is connected to form in regular turn by trend squiggle E3, trend squiggle E4 and trend squiggle E5 in the display unit 11; And; When real-time waveform curve L5 arrived location of pixels D, control module 4 can be carried out packed data compression step 104 according to the judged result of determining step 102.
In packed data compression step 104; Control module 4 utilizes the described fixedly ratio of compression of present embodiment; Trend Waveform display signal to showing in the display unit 11 compresses, and the waveform that is connected to form in regular turn by trend squiggle E3, trend squiggle E4 and trend squiggle E5 in the display unit 11 is compressed is shown as trend squiggle E6.
Because in the present embodiment, fixedly ratio of compression is elected 2: 1 as, therefore, the length of compressing the trend squiggle E6 of back formation is the half the of the preceding waveform length of compression.
In packed data compression step 104, control module 4 doubles present dynamic ratio of compression and described fixedly ratio of compression once more, forms new ram ratio.That is, make described ram ratio be adjusted into 8: 1 by current 4: 1.
With reference to figure 2,4,7g, after executing described packed data compression step 104, waveform demonstration controlled step 100 will be returned executive real-time Data Receiving step 101.Control module 4 can receive new measuring-signal from analog to digital conversion circuit 3 with keeping, and converts the measuring-signal that receives into Waveform display signal, continues with real-time waveform curve L5 it to be presented in the display unit 12.
When display unit 12 is drawn full real-time waveform curve L5 once more, that is, when real-time waveform curve L5 arrives last row locations of pixels T of display unit 12, control module 4 can be once more according to the judged result of determining step 102, executive real-time data compression step 103.
In real time data compression step 103; Control module 4 utilizes adjusted ram ratio; The pairing Waveform display signal boil down to of real-time waveform curve L5 trend Waveform display signal with in the display unit 12 is presented on it in trend waveform display unit 11 with trend squiggle E7.
Because in the present embodiment; This ram ratio was adjusted to 8: 1; Therefore; When control module 4 is shown as in the display unit 11 trend squiggle E7 with the real-time waveform curve L5 in the display unit 12 compression, the length of trend squiggle E7 be real-time waveform curve L5 length 1/8.At this moment, the waveform in the display unit 11 is to be connected to form in regular turn by trend squiggle E6 and trend squiggle E7.
With reference to figure 2,4,7h, after executing real time data compression step 103, waveform demonstration controlled step 100 will be returned executive real-time Data Receiving step 101 once more.Control module 4 can receive new measuring-signal from analog to digital conversion circuit 3 with keeping, and converts the measuring-signal that receives into Waveform display signal, and L6 is presented in the display unit 12 with the real-time waveform curve.
When display unit 12 is drawn full real-time waveform curve L6 once more, that is, when real-time waveform curve L6 arrives last row locations of pixels T of display unit 12, control module 4 can be once more according to the judged result of determining step 102, executive real-time data compression step 103.
In real time data compression step 103; Control module 4 utilizes above-mentioned adjusted ram ratio; The pairing Waveform display signal boil down to of real-time waveform curve L6 trend Waveform display signal with in the display unit 12 is presented on it in trend waveform display unit 11 with trend squiggle E8.
Because in the present embodiment; This ram ratio was adjusted to 8: 1; Therefore; When control module 4 is shown as in the display unit 11 trend squiggle E8 with the real-time waveform curve L6 in the display unit 12 compression, the length of trend squiggle E8 be real-time waveform curve L6 length 1/8.At this moment, the waveform in the display unit 11 is to be connected to form in regular turn by trend squiggle E6, trend squiggle E7 and trend squiggle E8.
Top illustrates, and only uses illustrational method, has introduced the initial several steps of operation waveform demonstration controlled step 100.In embodiment of the present invention; Described control module 4 can be continuous the described demonstration controlled step 100 of long-play; Multimeter 1 not only can pass through display unit 12; Real-time its measuring-signal that captures of demonstration of mode with waveform shows makes the user understand the changes in amplitude situation of measuring-signal timely, but also can pass through display unit 11; With the situation of its measurement data that captures in the past of waveform display mode demonstration, particularly can demonstrate the change procedure of the measurement data that captures before it.
In the present embodiment, after the compression of the real-time waveform curve in the display unit 12 is shown as the trend squiggle.Also display unit 12 is carried out cls operation,, can in display unit 12, show the Waveform display signal of the measurement data that newly captures again so that once more during executive real-time Data Receiving step 101.
In the present embodiment, the 10th locations of pixels of the abscissa axis x direction that described location of pixels D is a display unit 12 is in conjunction with reference to figure 3; For different application, also can select other location of pixels, such as the 25th locations of pixels of the abscissa axis x direction of selecting display unit 12 as location of pixels D; Certainly; As required, location of pixels D is elected as the 1st pixel of the abscissa axis x direction of display unit 12, even 0 location of pixels is fine also.
According to spirit of the present invention, the ram ratio described in the present embodiment also can be chosen other numerical value, such as, the initial value of ram ratio is chosen for 4: 1.
According to spirit of the present invention, the fixedly ratio of compression described in the present embodiment also can be chosen other numerical value, such as, can fixing ratio of compression be chosen for 4: 1.But, need to prove: when fixedly ratio of compression is chosen for 4: 1, when in step 104, changing described ram ratio, will described ram ratio be strengthened 4 times according to described fixedly ratio of compression at every turn.So that all the elements that in display unit 11, show all have identical ratio of compression.
In the present embodiment; No matter be in real time data compression step 103, to utilize ram ratio that the compression of real-time waveform curve is shown as the trend squiggle; Still in packed data compression step 104, utilize fixedly ratio of compression compression to show original trend squiggle; The method of its data compression can be diversified, selects method, mean value and selects method etc. and realize data compression such as adopting random selection method, maximal value to select method, minimum value.For the more characteristic that keeps legacy data, also can be simultaneously and with above-mentioned compressive display method, such as the method that shows maximal value and two groups of data of minimum value simultaneously etc.
In the present embodiment, control circuit 4 is to be made up of DSP, and DSP carries out described measurement controlled step and waveform and shows controlled step 100 under software control.
As illustrating; For different application; Control circuit 4 also can be to have DSP and programming device to mix to constitute; As utilize overhead control that DSP realizes digital multimeter 1 and Control on Communication etc., and utilize programming device to accomplish the measurement control of measuring equipment, data access control, show and control etc.In this case, described measurement controlled step or waveform show that controlled step 100 can be realized through logical circuit by programming device.
As illustrating; The control circuit 4 of digital multimeter 1 can be made up of 1 DSP and 1 programming device; In the face of large display screen, special display effect, special input and output effect, higher measuring speed, measuring accuracy or other more high performance situation the time, control circuit 4 also can be made up of multi-disc DSP and programming device.
In above-mentioned illustrating, described programming device is to be made up of FPGA, under different application environments, also can select the CPLD device for use.
Illustrate as another, control circuit 4 also can be made up of DSP and other control circuits, as being connected and composed by a DSP and an ASIC custom circuit, or two DSP devices formations is arranged.
The described multimeter 1 of present embodiment has following characteristics:
1) when a large amount of measuring task of multimeter 1 long-time execution; Make that described ram ratio is higher; When the trend wave form varies that display unit 11 shows is very slow; The user still can understand the waveform state of current signal of catching through the real-time waveform of observing in the display unit 12, and " blind area " can not occur;
2) owing to there is not the restriction of limit compressibility, the described multimeter 1 of present embodiment can utilize the trend squiggle of its display unit 11 demonstrations, on the whole the magnitude scope of reflected measurement data when carrying out a large amount of measuring task for a long time;
3) the described multimeter 1 of present embodiment shows trend waveform and real-time waveform simultaneously along the X axle; Not only make the user can observe more Useful Informations at one time; Directly grasp current measured value; And be of value to the user current measurement data is compared with historical data, help the user and understand the variation tendency of current measured value with respect to the measured value in past, help the user measurement result in future is predicted;
Claims (9)
1. one kind shows the digital multimeter of measurement result with waveform,
Have measuring unit, display unit and control module,
Described measuring unit is used to produce measurement data,
Described control module is used for producing a real-time waveform video data and a trend waveform video data according to described measurement data,
Described display unit comprises the trend waveform display unit and the real-time waveform display unit that is used for waveform mode showing real-time wave video data that are used for showing with the waveform mode trend waveform video data; Described trend waveform display unit and real-time waveform display unit horizontally set and next-door neighbour
It is characterized in that:
Described control module also is used to judge whether to satisfy the contractive condition of a real-time waveform video data; When satisfying the contractive condition of described real-time waveform video data; Utilize a ram ratio, described real-time waveform video data is converted into the part of described trend waveform video data;
Described control module also is used to judge whether to satisfy the contractive condition of a trend waveform video data; When satisfying the contractive condition of described trend waveform video data; Utilize a fixedly ratio of compression, compress described trend waveform video data and increase described ram ratio.
2. digital multimeter according to claim 1 is characterized in that:
The contractive condition of described real-time waveform video data is that the data volume of described real-time waveform video data reaches one first predetermined value;
The contractive condition of described trend waveform video data is that the data volume of described real-time waveform video data reaches one second predetermined value, and the data volume of described trend waveform video data is when reaching one the 3rd predetermined value.
3. digital multimeter according to claim 2 is characterized in that:
Described second predetermined value is greater than 1, and less than described first predetermined value.
4. according to claim 1,2 or 3 described devices, it is characterized in that:
Described fixedly ratio of compression is 2 to 1.
5. according to claim 1,2 or 3 described digital multimeter, it is characterized in that:
The initial value of described ram ratio is 2 to 1.
6. digital multimeter according to claim 4 is characterized in that:
The initial value of described ram ratio is 2 to 1.
7. according to claim 1,2,3 or 6 described digital multimeter; It is characterized in that: described control module also is used to calculate the amplitude range of described measurement data; When the amplitude of a new measurement data surpasses original amplitude range; Described control module is confirmed a new amplitude range again according to described new measurement data, and to refreshing described real-time waveform video data and trend waveform video data by new amplitude range.
8. digital multimeter according to claim 4; It is characterized in that: described control module also is used to calculate the amplitude range of described measurement data; When the amplitude of a new measurement data surpasses original amplitude range; Described control module is confirmed a new amplitude range again according to described new measurement data, and to refreshing described real-time waveform video data and trend waveform video data by new amplitude range.
9. digital multimeter according to claim 5; It is characterized in that: described control module also is used to calculate the amplitude range of described measurement data; When the amplitude of a new measurement data surpasses original amplitude range; Described control module is confirmed a new amplitude range again according to described new measurement data, and to refreshing described real-time waveform video data and trend waveform video data by new amplitude range.
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