CN107102283A - A kind of oscilloscope calibrator square wave amplitude measuring system and method - Google Patents
A kind of oscilloscope calibrator square wave amplitude measuring system and method Download PDFInfo
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- CN107102283A CN107102283A CN201710395842.5A CN201710395842A CN107102283A CN 107102283 A CN107102283 A CN 107102283A CN 201710395842 A CN201710395842 A CN 201710395842A CN 107102283 A CN107102283 A CN 107102283A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
A kind of oscilloscope calibrator square wave amplitude measuring system, adapts to include itself measurement without synchronous triggering signal function oscilloscope calibrator, including digital voltmeter, in addition to frequency meter, generator and program control computer；The present invention is proposed, the square-wave signal of function signal generator is utilized, the concept of synchronous triggering signal function is simulated so that itself oscilloscope calibrator without synchronous triggering signal function, also the method that similar high-speed sampling digital voltmeter method can be utilized, carries out square wave amplitude measurement.This method is compared with existing two kinds of method of testings, its uncertainty of measurement component, much smaller than impulse amplitude comparator method, as the uncertainty of measurement component size of high-speed sampling digital voltmeter method, but suitable for any kind of oscilloscope calibrator, whether do not limited by itself with synchronous triggering signal function.
Description
Technical field
The present invention relates to fields of measurement, more particularly to a kind of oscilloscope calibrator square wave amplitude measuring system and method.
Background technology
Referring to Fig. 1, it is a kind of common schematic diagram of existing Oscilloscope Calibration square wave amplitude measuring method.This method
It is high-speed sampling digital voltmeter method, and prover is set to " square wave calibration voltage " function, and frequency is put " 1kHz ".Sampling numeral
Multimeter puts " DC voltage, sampled measurements " function, and range is put " automatic ".Integration period (NPLC) puts " 0.01 ", sets gradually
The corresponding sampling delay time (0.0012s, 0.0007s), the top and bottom magnitude of voltage of square wave calibration voltage is measured respectively, and
Ceiling voltage is subtracted into floors voltage, its difference is square wave amplitude.This method is only applicable to itself band synchronous triggering signal work(
The oscilloscope calibrator of energy.
For itself oscilloscope calibrator without synchronous triggering signal function, Oscilloscope Calibration square wave amplitude measuring method
It is general to use impulse amplitude comparator method.As shown in Fig. 2 it is the basic circuit diagram of impulse amplitude comparator method.Prover is put
For " square wave calibration voltage " function, frequency is put " 1kHz ".Impulse amplitude comparator voltage puts tested magnitude of voltage.Digital multimeter is put
" DC voltage " measures function, and range is put " automatic ".The decay of high sensitivity oscilloscope Y-axis is corresponding to being tested voltage amplitude, sweeps speed
Put " 5ms/div ".By specification requires the balance of the Y-axis " sensitivity ", Y-axis " displacement " and comparator of regulation high-sensitive oscillograph
Voltage, makes oscilloscope display chopping voltage and tested wave crest (bottom) portion voltage equal, and the magnitude of voltage of digital multimeter is read respectively.
Ceiling voltage is subtracted into floors voltage, its value is square wave amplitude.
Although this method is to itself oscilloscope calibrator oscilloscope measurement prover side without synchronous triggering signal function
Wave amplitude is measured, still, due to the uncertainties of measurement such as digital multimeter, impulse amplitude comparator, high sensitivity oscilloscope point
Amount source is more, causes uncertainty of measurement component big, it is impossible to carries out whether qualified differentiation to the signal of small-range, deposits simultaneously
Measuring the problems such as precision is inadequate.
How to any species oscillograph regulator, particularly whether synchronous triggering signal function restriction is not carried by itself
Regulator, square wave amplitude measurement can also be carried out, and solve that accuracy of measurement is high, uncertainty of measurement component is few, can
Can also carry out whether qualified differentiation to small-range signal, this exactly the present invention need solve the problem of.
The content of the invention
The present invention proposes a kind of oscilloscope calibrator square wave amplitude measuring system and method, utilizes function signal generator
Square-wave signal, simulate the concept of synchronous triggering signal function so that itself oscillograph school without synchronous triggering signal function
Quasi- instrument, the method that can also utilize similar high-speed sampling digital voltmeter method, carries out square wave amplitude measurement.
A kind of oscilloscope calibrator square wave amplitude measuring system, adaptation includes itself and shown without synchronous triggering signal function
The measurement of ripple device prover, including digital voltmeter, in addition to frequency meter, generator and program control computer；
Frequency meter：The oscilloscope calibrator, program control computer are connected respectively, for receiving oscilloscope calibrator amplitude letter
Breath, reads its current frequency information, and it is sent into program control computer；
Generator：Difference rate of connections meter, program control computer and digital voltmeter, the control for receiving program control computer are produced
The Signal averaging to frequency meter is submitted to the program control computer by signal after reading the frequency signal through the frequency meter；
And the final signal that it is exported after program control computer accreditation synchronously triggers information transmission extremely as oscilloscope calibrator
The digital voltmeter；
Program control computer：The oscillograph is gathered for controlling generator adjustment to produce the frequency of signal, and in frequency meter
The frequency and the frequency of generator generation signal that prover currently produces signal are recognized as in locking range default, are permitted
Perhaps described generator exports its final signal；
Digital voltmeter, its external trigger port connection generator, the square-wave signal of oscilloscope calibrator adds sampling numeral
The measurement input port of multimeter；Complete the square wave measurement.
A kind of oscilloscope calibrator square wave amplitude measuring method, adaptation includes itself and shown without synchronous triggering signal function
The measurement of ripple device prover, comprises the following steps：
Frequency meter receives oscilloscope calibrator amplitude information, reads its current frequency information, and it is sent into program-controlled electric
Brain；
The control that generator receives program control computer produces signal by the Signal averaging to frequency meter, is read through the frequency meter
Take and the program control computer is submitted to after the frequency signal；
Program control computer contrasts the frequency and generator generation signal that the oscilloscope calibrator currently produces signal
Whether frequency is in synchronous regime, if, it is allowed to generator exports final signal as oscilloscope calibrator and synchronously triggers information
The digital voltmeter is transferred to, the signal frequency that generator is produced otherwise is adjusted, frequency meter is superimposed to again；
Digital voltmeter sets " DC voltage, sampled measurements " function, and range puts " automatic ", sets gradually corresponding sampling
Time delay, complete the square wave measurement.
This method is compared with existing two kinds of method of testings, and its uncertainty of measurement component compares much smaller than impulse amplitude
Instrument method, as the uncertainty of measurement component size of high-speed sampling digital voltmeter method, but suitable for any kind of oscillography
Whether device prover, do not limited by itself with synchronous triggering signal function.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of common oscilloscope calibrator square wave amplitude measuring system in the prior art；
Fig. 2 is a kind of principle of the oscilloscope calibrator square wave amplitude measuring system without synchronizing signal in the prior art
Figure；
Fig. 3 is a kind of schematic diagram of the oscilloscope calibrator square wave amplitude measuring system without synchronizing signal of the present invention.
Embodiment
For the oscilloscope calibrator square wave amplitude signal without synchronous Trigger Function, by such as Fig. 3 devices by function signal
The signal that generator is finally produced, digital voltmeter is passed to as oscilloscope calibrator square wave amplitude synchronous triggering signal, is risen
To external trigger function.
A kind of oscilloscope calibrator square wave amplitude measuring system, adaptation includes itself and shown without synchronous triggering signal function
The measurement of ripple device prover, including digital voltmeter, it is characterised in that also including frequency meter, generator and program control computer；
Frequency meter：The oscilloscope calibrator, program control computer are connected respectively, for receiving oscilloscope calibrator amplitude letter
Breath, reads its current frequency information, and it is sent into program control computer；
Generator：Difference rate of connections meter, program control computer and digital voltmeter, the control for receiving program control computer are produced
The Signal averaging to frequency meter is submitted to the program control computer by signal after reading the frequency signal through the frequency meter；
And the final signal that it is exported after program control computer accreditation synchronously triggers information transmission extremely as oscilloscope calibrator
The digital voltmeter；
Program control computer：The oscillograph is gathered for controlling generator adjustment to produce the frequency of signal, and in frequency meter
The frequency and the frequency of generator generation signal that prover currently produces signal are recognized as in locking range default, are permitted
Perhaps described generator exports its final signal；
Digital voltmeter, its external trigger port connection generator, the square-wave signal of oscilloscope calibrator adds sampling numeral
The measurement input port of multimeter；Complete the square wave measurement.
The program control computer sets accreditation instruction and does not approve instruction,
Frequency meter gathers the frequency and the frequency of generator generation signal that the oscilloscope calibrator currently produces signal
Rate is in the state of both difference on the frequency≤1mHz, and program control computer sends accreditation instruction, and the generator exports final signal；
Frequency meter gathers the frequency and the frequency of generator generation signal that the oscilloscope calibrator currently produces signal
Rate is in the state of both difference on the frequency ＞ 1mHz, and program control computer, which is sent, does not approve instruction, after the difference on the frequency for subtracting both
Frequency information is committed to generator, and the signals of equal frequencies is sent to the frequency meter by generator.
Illustrated subsequently so that generator is the function signal generator for sending square-wave signal as an example.
Its idiographic flow is as follows：Oscilloscope calibrator is set to " square wave calibration voltage " function, and frequency puts " 1kHz ", by oscillography
Device prover square wave amplitude signal adds to frequency meter, reads out its frequency information, and number of significant digit retains to 0.1mHz.By program control
Computer, function signal generator is submitted to by the information.Then by function signal generator, the equal frequencies that amplitude is 2V are sent
Square-wave signal.The signal is equally superimposed to frequency meter, and frequency meter reads out the frequency information of function signal generator, carries again
Give program control computer.
And program control computer is compared to twice frequency signal, as both difference on the frequency≤1mHz, then PASS is judged to, by
Function signal generator exports the signal to the external trigger of digital voltmeter.As both difference on the frequency ＞ 1mHz, then it is judged to
FAIL.At this moment by the frequency information of pulse amplitude signal, both difference on the frequencies are subtracted.Again through program control computer, two will be subtracted
Frequency information after the difference on the frequency of person submits to function signal generator.Then again by function signal generator, send equal
The signal of frequency.Repeat above step, until program control computer is compared to twice frequency signal, both difference on the frequency≤1mHz
Untill.
Finally, by external trigger of the function signal generator to digital voltmeter, the signal is exported as synchronous triggering signal.
Although this method can not realize it is the same with oscilloscope calibrator square wave amplitude signal synchronous, due to both
Difference on the frequency≤1mHz so that within the time needed for measurement, realize synchronous with pulse amplitude signal, reached accurate survey
The purpose of amount.Certainly, the synchronous condition of this part can be both difference on the frequency≤1mHz or other settings it is same
Step condition.
In this example, why both difference on the frequency need≤1mHzApplicant thinks：Due to oscilloscope calibrator square wave width
Spend the signal frequency of frequency and function signal generator, it is impossible to completely the same, when when originating measurement with terminating to measure, both
Waveform, has regular hour displacement difference, but as long as time shifting difference does not influence measurement result, we are to think that both are same
Step.
Assuming that oscilloscope calibrator square wave amplitude frequency is just 1kHz, then its cycle time is 1ms, and function signal is sent out
The square-wave signal and oscilloscope calibrator square wave amplitude difference on the frequency of raw device output, are just limiting value 1mHz, are 999.999Hz,
Then its cycle time is 1.000001ms.
In actual test, oscilloscope calibrator square wave amplitude cycle and the letter as synchronizing signal of first measurement point
Number signal generator square-wave signal periodic inequality is 1ns (0.000001ms).
And the time of measuring of a prescription wave amplitude is completed about between 3~5s.Our values are larger, use 10s conducts
Time of measuring, relative to starting point, at final time of measuring point (10s points), it is seen that be oscilloscope calibrator output the
10000 square wave amplitude waveforms, its cycle is 10000ns with the function signal generator signal period difference as synchronizing signal
(0.01ms)。
At the top and bottom of measurement during magnitude of voltage, because wave top width and bottom width are respectively 0.5ms, and it is actual
Because the influence that periodic inequality is brought is only 0.01ms during measurement, it is had no effect.Therefore both difference on the frequency≤1mHz, i.e.,
It may be such that within the time needed for measurement, realize function signal generator signal and oscilloscope calibrator square wave amplitude signal
It is synchronous)
In this example, have after synchronizing signal, subsequently measure.
Specific measurement process is as follows：The synchronizing signal that function signal generator is produced adds the outer of sampling digital multimeter
Port is triggered, the square-wave signal of oscilloscope calibrator adds the measurement input port of sampling digital multimeter.
Sampling digital multimeter puts " DC voltage, sampled measurements " function, and range is put " automatic ".Integration period (NPLC) is put
" 0.005 ", set gradually the corresponding sampling delay time for 0.0005s, 0.0006s, 0.0007s, 0.0008s, 0.0009s,
0.0010s, 0.0011s, 0.0012s, 0.0013s, 0.0014s. measure magnitude of voltage respectively.By this 10 numerical value carry out from it is small to
The difference of big sequence, its 8th numerical value and the 3rd numerical value, as square wave amplitude.
Explain why the difference of the 8th numerical value and the 3rd numerical value, as square wave amplitude：(the week of setting digital multimeter
Phase is 50Hz, then when integration period (NPLC) is 1, the time of integration is 0.02s, when integration period (NPLC) puts " 0.005 ",
The time of integration is 0.0001s, thus when the sampling delay time taking 0.0005s, its DC voltage value measured, exactly
DC voltage value between 0.0005s to 0.0006s.
When we choose the sampling delay time for 0.0005s, 0.0006s, 0.0007s, 0.0008s, 0.0009s,
When 0.0010s, 0.0011s, 0.0012s, 0.0013s, 0.0014s, a complete 0.001s is just measured at this ten
10 magnitudes of voltage of (1ms) in the time.
Because oscilloscope calibrator square-wave voltage frequency is 1kHz, then 1ms measurement has just corresponded to the complete of square wave
Complete cycle.
Due to itself oscilloscope calibrator with synchronous triggering signal function, prolonging between its trigger signal and square-wave signal
Slow time relationship be it is fixed, so existing calibrating standard could from fixed sampling delay time (0.0012s,
0.0007s)
And we are due to being synchronizing signal that artificial " manufacture " one matches with oscilloscope calibrator square wave amplitude signal,
Its time delay relation between square-wave signal is uncertain certainly.But it is changeless to have a bit, that is, one
In the individual complete square-wave signal cycle, we divide 10 points equally, and this 10 points include 5 high level and 5 low levels certainly.
In view of that in high level, may there is overshoot, cause top voltage value it is bigger than normal, the numerical value should be given up.Low
During level, may have sagging, cause bottom voltage value less than normal, the numerical value should also be as giving up.When integration period just falls in height
Level transitions to low level (or being transitioned into high level from low level) between the two when, the voltage value be in transition stage,
It should give up.
Then to 10 numerical value sorted from small to large, eliminate incredible maximum, minimum value and intermediate form it
Afterwards, the 8th numerical value left, is top magnitude of voltage, the 3rd numerical value, as bottom magnitude of voltage, as both differences, side
Wave amplitude.
Certainly, the present invention can also use the signals such as the triangular wave, sine wave, impulse wave of other generators, alternative functions letter
The square-wave signal of number generator.8th numerical value after this example will sort, as top magnitude of voltage, other schemes may be by the 9th
Individual numerical value or the 7th numerical value, are used as top magnitude of voltage.3rd numerical value after this example will sort, as bottom magnitude of voltage, its
Its scheme may regard the 4th numerical value or second numerical value as bottom magnitude of voltage.
A kind of oscilloscope calibrator square wave amplitude measuring method, adaptation includes itself and shown without synchronous triggering signal function
The measurement of ripple device prover, comprises the following steps：
Frequency meter receives oscilloscope calibrator amplitude information, reads its current frequency information, and it is sent into program-controlled electric
Brain；
The control that generator receives program control computer produces signal by the Signal averaging to frequency meter, is read through the frequency meter
Take and the program control computer is submitted to after the frequency signal；
Program control computer contrasts the frequency and generator generation signal that the oscilloscope calibrator currently produces signal
Whether frequency is in synchronous regime, if, it is allowed to generator exports final signal as oscilloscope calibrator and synchronously triggers information
The digital voltmeter is transferred to, the signal frequency that generator is produced otherwise is adjusted, frequency meter is superimposed to again；
Digital voltmeter sets " DC voltage, sampled measurements " function, and range puts " automatic ", sets gradually corresponding sampling
Time delay, complete the square wave measurement.
When the generator is the function signal generator that sends square-wave signal,
Sampling digital multimeter puts " DC voltage, sampled measurements " function, and range is put " automatic "；Integration period (NPLC) is put
" 0.005 ", set gradually the corresponding sampling delay time for 0.0005s, 0.0006s, 0.0007s, 0.0008s, 0.0009s,
0.0010s, 0.0011s, 0.0012s, 0.0013s, 0.0014s, measure magnitude of voltage respectively；By this 10 numerical value carry out from it is small to
The difference of big sequence, its 8th numerical value and the 3rd numerical value, as square wave amplitude.
When the generator to produce the generator including triangular wave, sine wave, impulse wave, sampling digital multimeter is put
" DC voltage, sampled measurements " function, range is put " automatic ".Integration period (NPLC) puts " 0.005 ", sets gradually and adopts accordingly
Sample time delay be 0.0005s, 0.0006s, 0.0007s, 0.0008s, 0.0009s, 0.0010s, 0.0011s, 0.0012s,
0.0013s, 0.0014s, measure magnitude of voltage respectively；Using the 9th numerical value or the 7th numerical value as top magnitude of voltage by the 4th
Numerical value or second numerical value, as bottom magnitude of voltage, its difference is square wave amplitude.
It the above is only example explanation, those skilled in the art should be understood that the present invention can be with many other specific
Form is implemented without departing from the spirit or scope of the present invention.Although also have been described embodiments of the invention, it should be understood that the present invention
Should not be limited to these embodiments, present invention spirit that those skilled in the art can define such as appended claims and
Within the scope of make and changing and modifications.
Claims (8)
1. a kind of oscilloscope calibrator square wave amplitude measuring system, adaptation includes itself without synchronous triggering signal function oscillography
The measurement of device prover, including digital voltmeter, it is characterised in that also including frequency meter, generator and program control computer；
Frequency meter：The oscilloscope calibrator, program control computer are connected respectively, for receiving oscilloscope calibrator amplitude information, are read
Its current frequency information is taken, and it is sent to program control computer；
Generator：Difference rate of connections meter, program control computer and digital voltmeter, the control for receiving program control computer produce signal
By the Signal averaging to frequency meter, the program control computer is submitted to after reading the frequency signal through the frequency meter；And
The final signal that it is exported after program control computer accreditation as oscilloscope calibrator synchronously triggering information transmission to described
Digital voltmeter；
Program control computer：The Oscilloscope Calibration is gathered for controlling generator adjustment to produce the frequency of signal, and in frequency meter
The frequency and the frequency of generator generation signal that instrument currently produces signal are recognized as in locking range default, it is allowed to institute
State generator and export its final signal；
Digital voltmeter, its external trigger port connection generator, the square-wave signal of oscilloscope calibrator adds sampling digital versatile
The measurement input port of table；Complete the square wave measurement.
2. the system as claimed in claim 1, it is characterised in that
The program control computer sets accreditation instruction and does not approve instruction,
Frequency meter gathers the oscilloscope calibrator and currently produced at the frequency of signal and the frequency of generator generation signal
In the state of both difference on the frequency≤1mHz, program control computer sends accreditation instruction, and the generator exports final signal；
Frequency meter gathers the oscilloscope calibrator and currently produced at the frequency of signal and the frequency of generator generation signal
In the state of both difference on the frequency ＞ 1mHz, program control computer, which is sent, does not approve instruction, subtracts the frequency after both difference on the frequencies
Information is committed to generator, and the signals of equal frequencies is sent to the frequency meter by generator.
3. system as claimed in claim 1 or 2, it is characterised in that the generator is the function signal for sending square-wave signal
Generator,
Sampling digital multimeter puts " DC voltage, sampled measurements " function, and range is put " automatic "；Integration period (NPLC) is put
" 0.005 ", set gradually the corresponding sampling delay time for 0.0005s, 0.0006s, 0.0007s, 0.0008s, 0.0009s,
0.0010s, 0.0011s, 0.0012s, 0.0013s, 0.0014s, measure magnitude of voltage respectively；By this 10 numerical value carry out from it is small to
The difference of big sequence, its 8th numerical value and the 3rd numerical value, as square wave amplitude.
4. system as claimed in claim 1 or 2, it is characterised in that the generator is generation triangular wave, sine wave, pulse
Generator including ripple,
Sampling digital multimeter puts " DC voltage, sampled measurements " function, and range is put " automatic ".Integration period (NPLC) is put
" 0.005 ", set gradually the corresponding sampling delay time for 0.0005s, 0.0006s, 0.0007s, 0.0008s, 0.0009s,
0.0010s, 0.0011s, 0.0012s, 0.0013s, 0.0014s, measure magnitude of voltage respectively；By the 9th numerical value or the 7th number
Value is as top magnitude of voltage by the 4th numerical value or second numerical value, and as bottom magnitude of voltage, its difference is square wave amplitude.
5. a kind of oscilloscope calibrator square wave amplitude measuring method, adaptation includes itself without synchronous triggering signal function oscillography
The measurement of device prover, it is characterised in that comprise the following steps：
Frequency meter receives oscilloscope calibrator amplitude information, reads its current frequency information, and it is sent into program control computer；
The control that generator receives program control computer produces signal by the Signal averaging to frequency meter, and institute is read through the frequency meter
State and the program control computer is submitted to after frequency signal；
Program control computer contrasts the frequency and the frequency of generator generation signal that the oscilloscope calibrator currently produces signal
Whether synchronous regime is in, if, it is allowed to generator exports final signal as oscilloscope calibrator and synchronously triggers information transmission
To the digital voltmeter, the signal frequency that generator is produced otherwise is adjusted, frequency meter is superimposed to again；
Digital voltmeter sets " DC voltage, sampled measurements " function, and range puts " automatic ", sets gradually corresponding sampling delay
Time, complete the square wave measurement.
6. method as claimed in claim 5, it is characterised in that
The generator is the function signal generator for sending square-wave signal,
Sampling digital multimeter puts " DC voltage, sampled measurements " function, and range is put " automatic "；Integration period (NPLC) is put
" 0.005 ", set gradually the corresponding sampling delay time for 0.0005s, 0.0006s, 0.0007s, 0.0008s, 0.0009s,
0.0010s, 0.0011s, 0.0012s, 0.0013s, 0.0014s, measure magnitude of voltage respectively；By this 10 numerical value carry out from it is small to
The difference of big sequence, its 8th numerical value and the 3rd numerical value, as square wave amplitude.
7. method as claimed in claim 5, it is characterised in that the generator exists to produce triangular wave, sine wave, impulse wave
Interior generator,
Sampling digital multimeter puts " DC voltage, sampled measurements " function, and range is put " automatic ".Integration period (NPLC) is put
" 0.005 ", set gradually the corresponding sampling delay time for 0.0005s, 0.0006s, 0.0007s, 0.0008s, 0.0009s,
0.0010s, 0.0011s, 0.0012s, 0.0013s, 0.0014s, measure magnitude of voltage respectively；By the 9th numerical value or the 7th number
Value is as top magnitude of voltage by the 4th numerical value or second numerical value, and as bottom magnitude of voltage, its difference is square wave amplitude.
8. method as claimed in claim 7 is characterized in that, program control computer is compared to twice frequency signal, when both
During difference on the frequency≤1mHz, then PASS is judged to, the signal is exported to the external trigger of digital voltmeter by function signal generator.When two
During the difference on the frequency ＞ 1mHz of person, then FAIL is judged to；At this moment by the frequency information of pulse amplitude signal, both difference on the frequencies are subtracted.
Again through program control computer, the frequency information after the difference on the frequency for subtracting both is submitted into function signal generator.Then again
By function signal generator, the signal of equal frequencies is sent；Above step is repeated, until program control computer enters to twice frequency signal
Row compares, untill both difference on the frequency≤1mHz.
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| CN116312308A (en) * | 2023-04-27 | 2023-06-23 | 海的电子科技(苏州)有限公司 | Output voltage calibration method and device for shortening Bar and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114859281A (en) * | 2022-05-31 | 2022-08-05 | 深圳天通信息科技有限公司 | Calibration device and method for function generator |
| CN116312308A (en) * | 2023-04-27 | 2023-06-23 | 海的电子科技(苏州)有限公司 | Output voltage calibration method and device for shortening Bar and storage medium |
| CN116312308B (en) * | 2023-04-27 | 2023-10-13 | 海的电子科技(苏州)有限公司 | Output voltage calibration method and device for shortening Bar and storage medium |
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