CN103185824B - A kind of digital oscilloscope that can show mathematical operation result - Google Patents
A kind of digital oscilloscope that can show mathematical operation result Download PDFInfo
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Abstract
The invention discloses a kind of digital oscilloscope that can show mathematical operation result, including: the vertical gear of passage selects knob, for producing the vertical gear information of measured passage；Measurement channel, for gathering tested waveform according to vertical gear information, input block, for inputting mathematical operational formula；The vertical gear of mathematical operation selects knob, controls information for producing the vertical gear of computing waveform；Display unit, information is controlled for the vertical gear according to computing waveform, set the vertical gear of display window, and in display window, show the computing waveform corresponding with tested waveform and operational formula, always according to the vertical gear information of measured passage and the maximum perpendicular gear of mathematical operation formula setting display window and minimum vertical gear.Oscillograph of the present invention automatically determines the gear bands of high level operations function according to operational formula, compared with prior art, eliminates the most useless gear, and the gear bands automatically determined is more favorable for user and observes waveform.
Description
Technical field
The present invention relates to digital oscilloscope field, particularly to a kind of digital oscillography that can show mathematical operation result
Device.
Background technology
Mathematical operation function is the common function of one of digital oscilloscope, and this function can carry out plus-minus to tested waveform and take advantage of
Remove and wait mathematical operation, finally give the waveform after computing.Some high-end oscillographs also have senior fortune in the market
Calculate function, be possible not only to realize the simple mathematical operations such as addition subtraction multiplication and division, be also added into the high level operations such as integration, differential and logarithm
Function, and also motility and the practicality of this function can be enhanced by the form input operational formula of equation editing.
In order to observe details and the overall picture of waveform after computing, in addition it is also necessary to have the gear adjusting function of vertical direction, convenient
User observes waveform after computing in vertical gear bands.In prior art, the mathematical operation function of digital oscilloscope vertical
Gear bands is fixing, all of calculation function i.e. arranges a general gear bands, but because participates in the logical of computing
The gear in road and operational formula are uncertain, and the Observable scope also resulting in waveform after computing is also uncertain,
If so using fixing gear bands, the problem that gear is wasted or gear is not enough will be produced.And for senior
Calculation function, owing to operational formula is more complicated, it is easier to produces foregoing problems.
Summary of the invention
In order to solve problems of the prior art, the present invention proposes a kind of number that can show mathematical operation result
Word oscillograph.
Digital oscilloscope of the present invention, including: the vertical gear of passage selects knob, for producing measured passage
Vertical gear information；Measurement channel, for gathering tested waveform according to described vertical gear information,
One input block, for one mathematical operation formula of input；
One vertical gear of mathematical operation selects knob, controls information for producing the vertical gear of a computing waveform；
One display unit, controls information for the vertical gear according to described computing waveform, sets hanging down of display window
Straight gear, and in described display window, show the computing waveform corresponding with described tested waveform and described operational formula；
Described display unit, always according to vertical gear information and the described mathematical operation formula of described measured passage
Set maximum perpendicular gear and the minimum vertical gear of described display window.
In digital oscilloscope of the present invention, it is possible to have multiple described vertical gears of passage select knob,
Each described vertical gear selects knob correspondence respectively to produce the vertical gear information of different measured passage；
Described display unit, it is also possible to public according to the described vertical gear information of multiple passages and described mathematical operation
Formula, sets the maximum display gear of described display window and minimum display gear.
In digital oscilloscope of the present invention, it is also possible to be described maximum perpendicular shelves at described display window
During position, the maximum amplitude of measuring of described computing waveform is that corresponding described display window divides in the minimum of described maximum perpendicular gear
The amplitude of resolution.
In digital oscilloscope of the present invention, it is also possible to be described minimum vertical gear at described display window
Time, the I of described computing waveform is measured the corresponding described display window maximum when described minimum vertical gear of amplitude and is shown
Show amplitude.
In digital oscilloscope of the present invention, described display unit, it is also possible to first according to described display window
The intervening gears that maximum perpendicular gear and minimum vertical gear limit, initializes the current vertical gear of described display window, and
Showing described computing waveform in described display window, then the vertical gear further according to described computing waveform controls information,
Reset the current vertical gear of described display window, and in described display window, show described computing waveform.
In digital oscilloscope of the present invention, the vertical gear of described mathematical operation selects knob, generation vertical
Gear information can also include an increasing informatio and an information of successively decreasing；Described display unit, according to described increasing informatio, makes
The vertical gear of mathematical operation of described display window increases, and according to described information of successively decreasing, makes the vertical gear of described mathematical operation subtract
Few.
In digital oscilloscope of the present invention, the vertical gear of mathematical operation at described display window equal to described
During big vertical gear, described display unit, it is also possible to according to described increasing informatio, limit the current number student movement of described display window
Calculating vertical gear is described maximum perpendicular gear.
In digital oscilloscope of the present invention, the vertical gear of computing at the mathematics of described display window is equal to institute
When stating minimum vertical gear, described display unit, it is also possible to according to described logical information of successively decreasing, limit the current of described display window
The vertical gear of mathematical operation is described minimum vertical gear.
In digital oscilloscope of the present invention, it is also possible to the vertical gear of mathematical operation at described display window is
During described minimum vertical gear, the vertical gear of mathematical operation described in response selects knob to produce vertical gear to successively decrease information,
Described display unit produces corresponding super gear information；
When the vertical gear of mathematical operation at described display window is described maximum perpendicular gear, the number described in response
Student movement is calculated vertical gear and is selected knob to produce vertical gear increasing informatio, and described display unit can also produce the super shelves of correspondence
Position information.
Oscillograph of the present invention can automatically adjust the gear bands of calculation function according to operational formula, with existing skill
Art is compared, and eliminates the most useless gear, and the gear bands automatically determined is more favorable for user observes waveform.
Further, the special vertical gear of mathematical operation that oscillograph of the present invention also has on front panel selects rotation
Button, very convenient user's regulation stall, and also easy to operate.When oscillograph of the present invention have gear transfinite prompting time,
User can also be avoided to carry out useless operation.
Accompanying drawing explanation
Fig. 1 is the structural representation of digital oscilloscope 1 in embodiment.
Fig. 2 is the structural representation of the front panel 201 of digital oscilloscope 1 in embodiment.
Fig. 3 is the flow chart of the mathematical operation gear bands method to set up of digital oscilloscope 1 in embodiment.
Fig. 4 is the computing waveform display effect figure when maximum perpendicular gear in embodiment.
Fig. 5 is the computing waveform display effect figure when minimum vertical gear in embodiment.
Detailed description of the invention
Introduce a preferred embodiment of the present invention below in conjunction with the accompanying drawings.
With reference to Fig. 1, digital oscilloscope 1 of the present invention includes the first signal input part 1011, secondary signal input
1012, the first Measurement channel 1021, the second Measurement channel 1022, display unit 103 and input block 104.
Signal input part 1011,1012 is for receiving analogue signal S1 to be measured of outside, S2, and is respectively transmitted to measuring logical
Road 1021,1022.
Measurement channel 1021,1022 is used for receiving analogue signal S1 to be measured, the S2 that signal input part 1011,1012 transmits,
And it is decayed, amplifies and impedance matching etc. processes, then carry out digital sample by digital-to-analogue conversion parts, generate digital
Signal.
As an example, Measurement channel 1021,1022 can also include the processing units such as bandwidth restriction, analog digital conversion.
As an example, digital oscilloscope 1 can also include a signal input part, four signal input parts or more
Many signal input parts, and with each signal input part Measurement channel one to one.
In the present embodiment, input block 104 is for receiving the various configuration informations of user, and these information is sent
It is used for realizing oscillographic various control to display unit 103 to operate.
Display unit 103 is used for the digital signal receiving Measurement channel 1021,1022 output, and according to single from input
The information-setting by user of unit 104, carries out digital processing to it, in its display window 105, generates analogue signal S1 to be measured, S2
Display waveform.
In this example it is shown that unit 103 also includes display, described display can provide display window 105,
Display window 105 presents to user for the described display waveform generated by display unit 103.Described display can pass through example
As CRT, LCD or LED etc. have the display unit realization of display function.
As an example, display unit 103 also includes the various control processing units to Measurement channel, described control list
Unit can be consisted of the multiple device such as DSP, FPGA or CPLD.
In the present embodiment, in conjunction with reference to Fig. 1,2, digital oscilloscope 1 also has a front panel 201, on front panel 201
The display that can provide display window 105 is installed, a mathematical operation vertical gear adjusting knob 202, and respectively with survey
The passage vertical gear adjusting knob 203,204 that amount passage 1021,1022 is corresponding.
In the present embodiment, the vertical gear information that Measurement channel 1021,1022 is arranged according to adjusting knob 203,204,
Set the vertical gear of its signals collecting, corresponding signal input part 1011,1012 gather analogue signal S1 to be measured, S2；
In the present embodiment, input block 104 receives the mathematical operation formula of user's input, and is given display unit
103；
As an example, input block 104 can be realized by the physical keyboard on front panel 201, it is also possible to passes through
The dummy keyboard formed by software display interface realizes, or the method that can also be combined by described physical keyboard and dummy keyboard is real
Existing.
In this example it is shown that unit 103 can be according to described mathematical operation formula to analogue signal S1 to be measured, S2
Perform mathematical calculations, obtain computing waveform；
In the present embodiment, user can pass through input block 104 inputting mathematical operational formula, and makes digital oscilloscope 1
According to described mathematical operation formula, described analogue signal to be measured being performed multiple mathematical operation, analogue signal the most to be measured is permissible
It is from one of Measurement channel 1021,1022, or two Measurement channel 1021,1022.As an example, for having relatively
For the oscillograph of many Measurement channel, described analogue signal to be measured can be from more Measurement channel.
When digital oscilloscope 1 performs mathematical operation according to described mathematical operation formula to described analogue signal to be measured, number
Vertical gear adjusting knob 202 is calculated in student movement can produce the vertical gear control information of computing waveform, and display unit 103 is according to tune
The vertical gear that joint knob 202 produces controls information, sets the vertical gear of display window 105, and according to this vertical gear control
Information processed, sets described computing waveform display amplitude in display window 105.
In this example it is shown that unit 103 can according to Measurement channel 1021,1022 gather analogue signal S1 to be measured,
The vertical gear used during S2 and mathematical operation formula, automatically set display window 105 when showing described computing waveform
Big vertical gear and minimum vertical gear.
Below with instantiation and combine Fig. 1, Fig. 2 and Fig. 3, be discussed in detail the present invention digital oscilloscope 1 the most really
Determine the control process of the vertical gear bands of mathematical operation.
As a example by by input block 104 inputting mathematical operational formula CH1+CH2, when CH1 input is sinusoidal signal, corresponding
Measurement channel 1021, CH2 input is sinusoidal signal, and corresponding Measurement channel 1022, display window 105 is divided into 8 lattice (positive and negative each 4
Lattice), the resolution of ADC acquisition component is 256.
Digital oscilloscope 1 performs data acquisition and according to described mathematical operation formula CH1+ to analogue signal S1 to be measured, S2
When CH2 performs corresponding mathematical operation to analogue signal S1 to be measured, S2, comprise the steps:
301: the vertical gear of passage is set
It is respectively provided with the vertical gear of CH1 and CH2 by passage vertical gear adjusting knob 203,204, is the most all set to
5V, specifically, the information of the vertical gear of user setup is to be sent to by the adjusting knob 203,204 in input block 104
Measurement channel 1021,1022, then Measurement channel 1021,1022 is respectively according to described vertical gear information, gathers defeated by signal
Enter analogue signal S1 to be measured of end 1011,1012 input, S2.
302: inputting mathematical formula, perform mathematical calculations
User utilizes the mathematical operation functional keys being arranged on front panel 201 to enter mathematical operation function, then
Relend Formula Input Technology frame inputting mathematical operational formula CH1+CH2 helped in display window 105, click on after confirming, display unit 103
Just perform mathematical calculations according to operational formula analogue signal S1 to be measured to collecting, S2, obtain computing waveform.
303: determine gear bands according to mathematical formulae
According to the mathematical operation formula CH1+CH2 of user's input, display unit 103 determines mathematical operation vertical gear model
Enclose, in order to solve the problem that in prior art, mathematical operation gear is wasted or gear is not enough, the mathematical operation shelves of the present invention
The determination principle of position scope is: under maximum perpendicular gear, and computing waveform maximum measures amplitude correspondence display window 105
The amplitude of little resolution；Under minimum vertical gear, the I of computing waveform measures the maximum of amplitude correspondence display window 105
Display amplitude.
Explanation of nouns:
1) maximum measurement amplitude and the I measurement amplitude of computing waveform refers to the computing ripple that oscillograph can be measured
The maximum amplitude of shape and minimum amplitude.
2) amplitude of the distinguishable rate of the minimum of display window 105 is that the resolution of the numerical value according to vertical gear and ADC is true
Fixed value, in this example, the resolution of ADC is 256, i.e. display window 105 can show 256 points, again because of display window 105 altogether
It is divided into 8 lattice, so every lattice can show 32 points, it is assumed that vertical gear is D (the displayable voltage of every lattice), then display window
The amplitude of the distinguishable rate of minimum of 105 is D/32.
3) 4 lattice that maximum display amplitude is display window of display window 105.
Mathematical operation formula according to input determines that the method for the vertical gear bands of mathematical operation is as follows:
1) first basis is determined above the principle of gear bands, determines the gear bands of each operand in formula, at this
In example, the vertical gear of CH1 is 5V, so the maximum amplitude of measuring of CH1 is 5*4=20V, I measures amplitude is 5/32.
Under maximum perpendicular gear, maximum is measured amplitude and is shown as a point, the width of the minimum resolution of i.e. corresponding display window 105
Value, so obtaining maximum perpendicular gear is H1=5*4*32=5*128；Under minimum vertical gear, by the minimum of computing waveform
Amplitude can be measured and be shown as maximum display 4 lattice of amplitude, so obtaining minimum vertical gear is L1=5/ (32*4)=5/128.
In like manner, CH2 maximum perpendicular gear H2=5*128, minimum vertical gear L2=5/128 are obtained.
2) then by maximum perpendicular gear (H1, H2) and minimum vertical gear L1, the L2 of operand CH1 and CH2) generation respectively
Entering to operational formula CH1+CH2, the maximum perpendicular gear obtaining computing waveform is H1+H2=5*128+5*128=1280V,
Little vertical gear is L1+L2=5/128+5/128=78.125mV.
3) for the ease of controlling, the gear ultimate value obtained also needs to format, and uses 1-in the present embodiment
2-5 multilevel mode, namely the gear value of calculating is normalized to immediate meet 1-2-5 system bigger numerically.
After formatting, maximum perpendicular gear is 2000V, and minimum vertical gear is 100mV, with reference to Fig. 4 and Fig. 5, point
When the vertical gear of mathematical operation Wei be adjusted to maximum perpendicular gear and minimum vertical gear, the design sketch of computing waveform,
In fig. 4 it is shown that the lower left corner a of window 105 shows the vertical gear of mathematical operation, middle lower section b shows mathematical operation formula, MAX
Representing computing waveform, can be seen that from figure under maximum perpendicular gear, computing waveform MAX is almost shown as straight line, i.e.
It is shown as 1 point in vertical direction；In Figure 5, MIN represents computing waveform, it is seen that under minimum vertical gear, computing waveform
MIN display all over the screen.
As an example, the method for the heretofore described vertical gear bands of determination mathematical operation applies also for subtraction
Computing, multiplying, division arithmetic, integral operation, differentiate, logarithm operation, exponent arithmetic and extracting operation.
The computational methods of the minimum and maximum vertical gear of other high level operations in addition to additive operation, are referred to
The principle of the determination gear bands in face and derivation method, below as a example by integral operation, illustrate concrete derivation method:
In oscillograph, the Wave data collected is discrete point, and therefore integral operation is equivalent to the accumulative of dot-product: m
(n)=∑ f (n) dx
Being m (n)=∑ f (n)/Sa in Applied Digital oscillograph, wherein Sa is sample rate；
For base during digital oscilloscope one, its sample rate is fixed, so
M (n)=(∑ f (n))/Sa, wherein Sa=horidot/horiscale, horidot are counting of the every lattice of level,
Horiscale is horizontal timebase；
So m (n)=(∑ f (n)) * horiscale/horidot；
For a fixing Measurement channel vertical gear scale, the maximum that can show in display window 105 is
Vertdiv*scale, vertdiv are the lattice number of vertical half screen；
In display window 105, the integration maximum of data point is
MAXintg=vertdiv*scale*horidiv*horidot*horiscale/horidot
=vertdiv*scale*horidiv*horiscale
For a fixing gear scale, the minima that can show in display window 105 is scale/vertdot,
Vertdot is counting of vertical every lattice；
In display window 105, the integration minima of data point is
MINintg=(scale/vertdot) * horidiv*horidot* (horiscale/horidot)
=(scale/vertdot) * horidiv*horiscale
For MAXintgEffective maximum perpendicular gear is
Uintg=MAXintg* vertdot, now MAXintgIt is shown as an available point, is i.e. U at computing gearintgTime,
In vertical direction, the value representated by a point is exactly MAXintg；
For MINintgEffective minimum gear is
Lintg=MINintg/ vertdiv, now MINtg accounts for the vertdiv lattice of display window 105, at computing gear is
LintgTime, the value representated by vertdiv*vertdot point is exactly MINintg；
Maximum perpendicular gear H and the computing formula of minimum vertical gear L when therefore obtaining integral operation are respectively as follows:
L=scale*horiscale*horidiv/ (vertdot*vertdiv) (1)
H=scale*horiscale*horidiv*vertdiv*vertdot (2)
Assume CH1 is integrated computing, then need to substitute in above formula (1) the maximum perpendicular gear H1 of CH1
Scale, substitutes into the scale in above formula (2) by the minimum vertical gear L1 of CH1, and other parameters in formula are all normal
Amount, i.e. can obtain maximum perpendicular gear and the minimum vertical gear of this integral operation.
It is exemplified below:
The gear of CH1 is 1v, time base 1us, vertical direction half screen lattice number 4, horizontal direction 14 lattice, every lattice number of effective points 32.
Calculate the gear bands of Intg (CH1)
The maximum perpendicular computing gear of CH1 1V is 1*128=1*4*32
The minimum vertical computing gear of CH1 1V is 1/128=1/32/4
L=1v/128*1us*14/ (32*4)=14uv/ (128*128)=0.85n
H=1v*128*1us*14*4*32=14uv*128*128=229.3m
Obtaining gear bands after entering formatting is 1n～500m.
As an example, for complicated operational formula, the operand in formula may comprise multiple passage or often
Amount, now when determining the vertical gear bands of mathematical operation, display unit 103 needs are simultaneously according to the gear of each operand
Scope, the gear bands of constant and operational formula calculate.
As an example, can determine only with maximum perpendicular gear of the present invention according to practical situations
Principle, and minimum vertical gear uses conventional methods realization, or only with of the present invention or minimum vertical gear
Determine principle, and maximum perpendicular gear uses conventional methods realization, or use of the present invention minimum and maximum simultaneously
Vertical gear determines principle.
304: acquiescence gear display waveform
After computing completes, display unit 103 can automatically set the vertical gear of mathematical operation of display window 105 immediately and be
The intervening gears that maximum perpendicular gear and minimum vertical gear limit, and show described computing waveform according to this gear, in this example
In, display unit 103 first passes through gear 10V and shows described computing waveform.
As an example, according to reality application needs, display unit 103 can also be in maximum perpendicular gear and minimum
The gear gear by default choosing other between vertical gear shows described computing waveform.
305: regulation stall
User regulates vertical gear, mathematical operation by the mathematical operation vertical gear adjusting knob 202 on front panel 201
Vertical gear adjusting knob 202 can produce a gear increasing informatio or a gear successively decreases information, display unit 103
Make the vertical gear of mathematical operation increase according to described increasing informatio, make the vertical gear of mathematical operation reduce according to the information of successively decreasing.
As an example, mathematical operation vertical gear adjusting knob 202 can use the knob of fixing scale, or its
He produces gear increasing informatio or gear by sensing direction of rotation and the anglec of rotation and successively decreases the knob of information, passs the most to the left
Subtracting, be incremented by the right, the angular dimension according to rotating determines increment or decrement.
306: with the gear display waveform after regulation
The vertical gear information that display unit 103 produces according to adjusting knob 202, resets hanging down of display window 105
Straight gear, and show described computing waveform according to this gear.
307: limit gear
When the vertical gear of mathematical operation is equal to maximum perpendicular gear, if mathematical operation vertical gear adjusting knob 202
Producing again increasing informatio, now the current vertical gear of mathematical operation can be limited in maximum perpendicular gear by display unit 103, protects
Hold gear constant；Equally, when the vertical gear of mathematical operation is equal to minimum vertical gear, if the regulation of mathematical operation vertical gear
Knob 202 produces again information of successively decreasing, and now the current vertical gear of mathematical operation can be limited in minimum vertical by display unit 103
Gear, keeps gear constant.Thus ensure that the vertical gear of mathematical operation is always in its gear bands.
308: prompting of transfiniting
When the vertical gear of mathematical operation is equal to maximum perpendicular gear, if mathematical operation vertical gear adjusting knob 202
Producing again increasing informatio, now the current vertical gear of mathematical operation can be limited in maximum perpendicular gear by display unit 103, protects
Hold gear constant, and produce super gear information simultaneously；Equally, when the vertical gear of mathematical operation is equal to minimum vertical gear
Time, if mathematical operation vertical gear adjusting knob 202 produces again information of successively decreasing, now display unit 103 can be by current number
Student movement is calculated vertical gear and is limited in minimum vertical gear, keeps gear constant, and gives excess of export gear information simultaneously.
As an example, the information that transfinites can use and show text prompt information in display window 105, or
Employing audible alarm is pointed out.
The above-described specific embodiment being only the present invention, the protection domain being not intended to limit the present invention, all at this
Within the spirit of invention and principle, any modification, equivalent substitution and improvement etc. done, should be included in the protection model of the present invention
Within enclosing.
Claims (9)
1. can show a digital oscilloscope for mathematical operation result, including:
The vertical gear of passage selects knob, for producing the vertical gear information of Measurement channel；
Measurement channel, for gathering tested waveform according to described vertical gear information,
One input block, for one mathematical operation formula of input；
One vertical gear of mathematical operation selects knob, controls information for producing the vertical gear of a computing waveform；
One display unit, controls information for the vertical gear according to described computing waveform, sets the vertical shelves of display window
Position, and in described display window, show the computing waveform corresponding with described tested waveform and described mathematical operation formula；
It is characterized in that,
Described display unit, vertical gear information and described mathematical operation formula always according to described Measurement channel set automatically
The maximum perpendicular gear of fixed described display window and minimum vertical gear.
Oscillograph the most according to claim 1, it is characterised in that
Having multiple vertical gear of described passage and select knob, each vertical gear of described passage selects knob correspondence respectively to produce
The vertical gear information of different measuring passage；
Described display unit, according to vertical gear information and the described mathematical operation formula of multiple described Measurement channel, automatically
Set the maximum display gear of described display window and minimum display gear.
Oscillograph the most according to claim 1 and 2, it is characterised in that
When described display window is described maximum perpendicular gear, the maximum amplitude of measuring of described computing waveform corresponds to
The amplitude of described display window minimum resolution under described maximum perpendicular gear.
Oscillograph the most according to claim 3, it is characterised in that
When described display window is described minimum vertical gear, the I of described computing waveform is measured amplitude and is corresponded to
The described display window maximum display amplitude under described minimum vertical gear.
Oscillograph the most according to claim 4, it is characterised in that
Described display unit, the middle gear first limited according to maximum perpendicular gear and the minimum vertical gear of described display window
Position, initializes the vertical gear of described display window, and shows described computing waveform in described display window,
Then the vertical gear further according to described computing waveform controls information, resets the vertical gear of described display window,
And in described display window, show described computing waveform.
Oscillograph the most according to claim 5, it is characterised in that
The vertical gear of described mathematical operation selects knob, and the vertical gear of generation controls information and includes an increasing informatio and
Individual information of successively decreasing；
Described display unit, according to described increasing informatio, makes the vertical gear of described display window increase, according to the described letter that successively decreases
Breath, makes the vertical gear of described display window reduce.
Oscillograph the most according to claim 6, it is characterised in that
When the vertical gear of described display window is equal to described maximum perpendicular gear,
Described display unit, according to described increasing informatio, the current vertical gear limiting described display window hangs down as described maximum
Straight gear.
Oscillograph the most according to claim 7, it is characterised in that
When the vertical gear of described display window is equal to described minimum vertical gear,
Described display unit, according to described information of successively decreasing, the current vertical gear limiting described display window hangs down as described minimum
Straight gear.
9. according to the oscillograph described in claim 7 or 8, it is characterised in that
The vertical shelves of mathematical operation when vertical gear at described display window is described minimum vertical gear, described in response
Position selects knob to produce vertical gear to successively decrease information, and described display unit produces corresponding super gear information；
The vertical shelves of mathematical operation when vertical gear at described display window is described maximum perpendicular gear, described in response
Position selects knob to produce vertical gear increasing informatio, and described display unit produces corresponding super gear information.
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| CN103340605A (en) * | 2013-07-11 | 2013-10-09 | 深圳市科曼医疗设备有限公司 | Waveform data output method and system of self-regulating waveform scale and medical monitor |
| CN104374968B (en) * | 2013-08-17 | 2018-05-25 | 苏州普源精电科技有限公司 | A kind of mixing oscillograph with Multifunctional knob |
| CN104013397B (en) * | 2014-06-09 | 2016-03-09 | 宁波瑞诺医疗科技有限公司 | A kind of pulse detection control method |
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