CN106093567A - A kind of high-precision wide frequency-domain frequency measures system and frequency measurement method - Google Patents
A kind of high-precision wide frequency-domain frequency measures system and frequency measurement method Download PDFInfo
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- CN106093567A CN106093567A CN201610383554.3A CN201610383554A CN106093567A CN 106093567 A CN106093567 A CN 106093567A CN 201610383554 A CN201610383554 A CN 201610383554A CN 106093567 A CN106093567 A CN 106093567A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/10—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into a train of pulses, which are then counted, i.e. converting the signal into a square wave
Abstract
The invention discloses a kind of high-precision wide frequency-domain frequency and measure system, it includes: a waveform shaping circuit, its input is connected to signal source；One gate control module, described gate control module is for performing control instruction and controlling the on/off of described square-wave signal；One frequency divider, described frequency divider for carrying out output pulse signal after scaling down processing by described square-wave signal；One microcontroller, described microcontroller is for gate control module transmission control instruction, and the pulse count signal exporting frequency divider also converses signal frequency data, and calibrate signal frequency data according to frequency measurement corrected parameter；One host computer, it is connected to microcontroller, for sending frequency measurement corrected parameter to microcontroller, and receives the signal frequency data after the calibration uploaded by microcontroller.The present invention can realize high-precision wide frequency-domain frequency measure, and simple in construction, easy to operate, with low cost, be prone to extension, reliable and stable.
Description
Technical field
The present invention relates to signal measurement technique field, particularly relate to a kind of high-precision wide frequency-domain frequency and measure system and frequency
Measuring method.
Background technology
In signal measurement technique field, frequency measurement is the most common concept, and frequency is the inverse of signal period, frequency
Meter is also called frequency counter, is a kind of electronic measuring instrument measured measured signal frequency specially.Cymometer is main
It is made up of four parts: time base circuit, input circuit, counting display circuit and control circuit.In traditional manufacturing enterprise
In industry, cymometer is widely used in the production test producing line.It is defeated that cymometer can quickly capture crystal oscillator
Going out the change of frequency, user can find out of order crystal oscillator product rapidly by using cymometer, it is ensured that product quality,
In Measurement Laboratory, cymometer is used to calibrate the local oscillator of various electronic metering equipments, surveys in wireless telecommunications
In examination, cymometer both can be used to calibrate the master clock of wireless communication base station, it is also possible to is used to radio set
Frequency Hopping Signal and frequency modulated signal be analyzed.
Chinese patent CN204347131U discloses a kind of intelligent frequency meter, comprising: microprocessor, signal condition shaping
Module, frequency division module, channel selector switch, data storage, range flat display module, numerical value display module, serial communication
Interface, the output signal of described signal condition Shaping Module is divided into two parts, a part export after frequency division module divides to
Channel selector switch, a part is directly output to channel selector switch, and microprocessor stores with channel selector switch, data respectively
Device, range flat display module, numerical value display module, serial communication interface, frequency division module are connected.Microprocessor can be according to measurement
The size of signal frequency value, it is achieved measure after whether dividing and gear adjusts automatically, it is possible to will by serial communication interface
The frequency values measuring signal is uploaded to PC, and with the demand of satisfied different occasions, the program is not shown in detail in the parameter of frequency measurement
With circuit realiration process, therefore the precision of frequency measurement, measurement scope, stability and the reliability of frequency have no way of learning.
Under normal circumstances, owing to components and parts are affected by aging, temperature, operating frequency, running voltage, frequency input signal
Too high or the precision and stability of the too low output that all can have influence on waveform shaping circuit, frequency dividing circuit, then frequency counting
By producing certain error, directly influencing the frequency-measurement accuracy of cymometer, overwhelming majority cymometer does not accounts for surveying at present yet
The dynamic parameter of frequency compensates, and thus causes cymometer different to the degree of accuracy of the measurement of high and low frequency signal.Realize
The frequency measurement of conventional periodic signal, it is necessary first to shaping circuit is by signal source (the such as triangular wave, sawtooth of non-rectangle ripple
Ripple, sine wave etc.) it is transformed into rectangular pulse, general integrated chip, the shaping circuit that such as 555 intervalometers, 74LS14 are constituted
Shaping for low frequency signal is the most competent, but is often difficult in adapt to the shaping of high-frequency signal, and the frequency for MHZ rank is whole
Shape poor effect, because waveform Severe distortion can not get the square wave of standard, thus affects the precision of follow-up frequency measurement.China
Patent CN103472300A describes a kind of easy technique cymometer, including the logic circuit being made up of integrated circuit CD4017,
Time base circuit, CD40110 integrated circuit and the charactron of 555 intervalometer compositions, this frequency measurement scheme is all realized by hardware, it is not necessary to
Microprocessor carries out software control, and cost is relatively low, but is because not having waveform shaping circuit, (such as sinusoidal for non-rectangle ripple
Ripple, triangular wave etc.) frequency cannot measure.The cymometer mentioned in Chinese patent CN103499738A all includes shaping electricity
Road, frequency dividing circuit, microprocessor module and other, but program frequency measurement scope is only 0HZ-9999HZ, frequency band is the narrowest, stability and
Precision is also difficult to ensure.
For realizing High Precision Frequency, generally require processor at a high speed provide high-precision intervalometer as time base letter
Number and high-precision enumerator pulse is counted, but corresponding processor cost and power consumption are the highest, and
And high-frequency signal is still difficult to measure without suitable frequency dividing circuit, Chinese patent CN102749508A describes frequency
Rate measurement apparatus and method, device includes CPU and the filter circuit connected with CPU and timing
Device；Filter circuit for being converted to the sinusoidal wave signal of telecommunication synperiodic square wave signal of telecommunication by the sine wave signal of telecommunication；Intervalometer is used for
The generation moment of record square wave signal of telecommunication upset；CPU, for the square wave signal of telecommunication of wave reception filtering circuit output, is read
Take moment occurring and determining the upset cycle of the square wave signal of telecommunication of intervalometer record, determine the sinusoidal wave signal of telecommunication according to the upset cycle
Frequency, but this system is not because have frequency dividing circuit, therefore cannot measure high-frequency signal.
Summary of the invention
The technical problem to be solved in the present invention is, for the deficiencies in the prior art, it is provided that one can realize high-precision wide
Frequency-domain frequency measure, and simple in construction, easy to operate, with low cost, be prone to extension, reliable and stable frequency measuring system and
Frequency measurement method.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that.
A kind of high-precision wide frequency-domain frequency measures system, and it includes: a waveform shaping circuit, its input is connected to letter
Number source, described waveform shaping circuit is for being transformed to square-wave signal by the waveshape signal shaping that signal source exports；One gate control
Molding block, its input is connected to the outfan of waveform shaping circuit, described gate control module be used for performing control instruction and
Control the on/off of described square-wave signal；One frequency divider, its input is connected to the outfan of gate control module, described point
Frequently device for carrying out output pulse signal after scaling down processing by described square-wave signal；One microcontroller, is connected to frequency dividing
The outfan of device and the control end of gate control module, described microcontroller refers to for sending control to gate control module
Order, the pulse count signal exporting frequency divider also converses signal frequency data, and according to frequency measurement corrected parameter to signal
Frequency data are calibrated；One host computer, it is connected to microcontroller, for sending frequency measurement corrected parameter to microcontroller, with
And receive the signal frequency data after the calibration uploaded by microcontroller.
Preferably, described waveform shaping circuit includes the first phase inverter, the second phase inverter, potentiometer and divider resistance,
The front end of described potentiometer is used for connecting signal source, and the sliding end of described potentiometer is connected to the input of the first phase inverter, institute
The input stating the second phase inverter is connected to the outfan of the first phase inverter, and described divider resistance is connected to the defeated of the first phase inverter
Entering between end and the outfan of the second phase inverter, the outfan of described second phase inverter is used for exporting square-wave signal.
Preferably, described gate control module includes the first NAND gate, an input of described first NAND gate with
The outfan of the second phase inverter is connected, and another input of described first NAND gate is for receiving the control that microcontroller sends
Instruction, and when described control instruction is 1, described square-wave signal is connected, when described control instruction is 0 by described rectangle
Ripple signal disconnects.
Preferably, described first phase inverter, the second phase inverter and the first NAND gate are integrated in a model is 74HC00N's
Within chip, the NAND gate of input short circuit is constituted by described first phase inverter by one, and described second phase inverter is by another
The NAND gate of input short circuit is constituted.
Preferably, described frequency divider is made up of 8 binary adders.
Preferably, described microcontroller is made up of STC89S52 single-chip microcomputer and peripheral circuit thereof.
Preferably, it is connected by level switch module between described host computer and microcontroller, described level switch module
It it is the serial communication circuit being made up of MAX232 chip and peripheral circuit thereof.
Preferably, also include power module, described power module for waveform shaping circuit, gate control module,
Frequency divider and microcontroller are powered.
A kind of high-precision wide frequency-domain frequency measuring method, realizes based on frequency measuring system, and this frequency measuring system includes
Having waveform shaping circuit, gate control module, frequency divider and microcontroller, this frequency measurement method comprises the steps: step
S1, system initialization, the waveshape signal shaping that signal source is exported by waveform shaping circuit is transformed to square-wave signal, and gate controls
Module is closed；Step S2, microcontroller judges whether to produce timer interruption, if then performing step S3, if not
Then repeat this step S2；Step S3, described microcontroller sends control instruction to gate control module, to make gate control module
Described square-wave signal is transmitted to frequency divider；Step S4, described frequency divider exports after square-wave signal carries out scaling down processing
Pulse signal is to microcontroller；Step S5, the pulse count signal that frequency divider is exported by described microcontroller；Step S6, regularly
Device arrives presets timing, and timeing closing device and gate control module, described microcontroller is according to pulse signal number and determines
Time the time converse signal frequency data；Step S7, the frequency measurement corrected parameter that described microcontroller provides according to host computer is to letter
Number frequency data carry out frequency calibration, and the signal frequency data after calibration are uploaded to host computer.
Preferably, in described step S1, system initialization includes that intervalometer initializes and serial ports initializes；Described step S6
In, the timing of intervalometer is 1S.
In high-precision wide frequency-domain frequency measurement system disclosed by the invention, utilize waveform shaping circuit by non-rectangle wave conversion
For square wave, utilize gate control module to control to be sent to the input break-make of the square wave of frequency divider, utilize frequency divider by after shaping
Square wave carry out dividing and count cumulative, the pulse signal exported frequency divider by microcontroller counted, processes, defeated
Going out measurement result, frequency measurement is mail to host computer and shows by microcontroller afterwards, in order to teledata is shared, and goes up simultaneously
Corresponding frequency measurement corrected parameter can be mail to microcontroller according to the height of signal frequency and carry out dynamic frequency measurement by position machine automatically
Calibration.Based on above-mentioned characteristic, the present invention not only ensure that the measurement accuracy of different frequency scope, and this system structure is simple
Single, easy to operate, with low cost, especially under different application scene, the present invention is more easily extensible application, reliable and stable.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of frequency measuring system of the present invention；
Fig. 2 is the partial circuit diagram of frequency measuring system of the present invention；
Fig. 3 is the main program flow chart of frequency measurement method of the present invention；
Fig. 4 is the flow chart that frequency calibration and frequency calculate process；
Detailed description of the invention
With embodiment, the present invention is described in more detail below in conjunction with the accompanying drawings.
The invention discloses a kind of high-precision wide frequency-domain frequency and measure system, as it is shown in figure 1, it includes:
One waveform shaping circuit 1, its input is connected to signal source 8, and described waveform shaping circuit 1 is for by signal source 8
The waveshape signal shaping of output is transformed to square-wave signal；
One gate control module 2, its input is connected to the outfan of waveform shaping circuit 2, described gate control module 2
The on/off of described square-wave signal is controlled for performing control instruction；
One frequency divider 3, its input is connected to the outfan of gate control module 2, and described frequency divider 3 is for by described square
Shape ripple signal carries out output pulse signal after scaling down processing；
One microcontroller 4, is connected to the outfan of frequency divider 3 and the control end of gate control module 2, described micro-
Controller 4 is for sending control instruction to gate control module 2, to the pulse count signal of frequency divider 3 output and converse letter
Number frequency data, and according to frequency measurement corrected parameter, signal frequency data are calibrated；
One host computer 5, it is connected to microcontroller 4, for sending frequency measurement corrected parameter to microcontroller 4, and receives
Signal frequency data after the calibration uploaded by microcontroller 4.
In said frequencies measurement system, utilize waveform shaping circuit by non-rectangle ripple (triangular wave, sine wave, sawtooth waveforms etc.)
It is transformed to square wave, utilizes gate control module to control to be sent to the input break-make of the square wave of frequency divider, utilize frequency divider by whole
Square wave after shape carries out dividing and count cumulative, and the pulse signal exported frequency divider by microcontroller is counted, locates
Reason, output measurement result, frequency measurement is mail to host computer and show by microcontroller afterwards, in order to teledata is shared,
Corresponding frequency measurement corrected parameter can be mail to microcontroller according to the height of signal frequency and moves by host computer automatically simultaneously
State frequency measurement is calibrated.Based on above-mentioned characteristic, the present invention not only ensure that the measurement accuracy of different frequency scope, and this system is tied
Structure is simple and convenient to operate, with low cost, especially under different application scene, the present invention is more easily extensible application, reliable and stable.
About particular circuit configurations, shown in Fig. 1 and Fig. 2, described waveform shaping circuit 1 includes the first phase inverter
RAA, the second phase inverter RBA, potentiometer R1 and divider resistance R2, the front end of described potentiometer R1 is used for connecting signal source 8, described
The sliding end of potentiometer R1 is connected to the input of the first phase inverter RAA, and the input of described second phase inverter RBA is connected to
The outfan of one phase inverter RAA, described divider resistance R2 is connected to input and the second phase inverter RBA of the first phase inverter RAA
Outfan between, the outfan of described second phase inverter RBA is used for exporting square-wave signal.
Further, described gate control module 2 includes the first NAND gate RCA, of described first NAND gate RCA
The outfan of input and the second phase inverter RBA is connected, and another input GATE of described first NAND gate RCA is used for receiving
The control instruction that microcontroller 4 sends, and when described control instruction is 1, described square-wave signal is connected, when described control
When instruction is 0, described square-wave signal is disconnected.
In order to save number of elements, described first phase inverter RAA, the second phase inverter RBA and the first NAND gate RCA are integrated in
Within one model is the chip of 74HC00N, the NAND gate of input short circuit is constituted by described first phase inverter RAA by one,
The NAND gate of input short circuit is made up of by described second phase inverter RBA another.
In the present embodiment, using Schmidt trigger to constitute waveform shaping circuit, this waveform shaping circuit can be by limit
It is shaped to, along changing non-pulse square wave slowly, the Pulse High Voltage that edge is the steepest, thus realizes the shaping of waveform, refer to
Fig. 2, two inputs of NAND gate 74HC00N are coupled together composition phase inverter by the present embodiment, are then concatenated by two-stage phase inverter
Get up, simultaneously by divider resistance R2 by the Voltage Feedback of outfan to input, just constitute Schmidt trigger in the same direction, two
Individual phase inverter is cmos circuit, their threshold voltage vt h=1/2Vdd, and wherein Vdd is the running voltage of 74HC00N, due to
Two-stage phase inverter has been connected into positive-feedback circuit, so when Signal-in (signal source) voltage gradually rises to A point voltage Va from 0V
During equal to Vth, a positive feedback process can be produced, make B point (signal output part) voltage Vb be rapidly converted into Vb=Vdd.Equally,
When Va is gradually reduced and makes the A point voltage Va threshold voltage vt h equal to phase inverter from high level Vdd, the most also have one
The process of positive feedback so that Vb is changed into rapidly 0.During two above, input correspond to two threshold voltages respectively: just
To threshold voltage vt h+, reverse threshold voltage vt h-, the value of the two is different.Vth+=1+R1/R2Vth, Vth-=1-R1/
R2Vth, so positive and negative threshold voltage can be regulated by slide rheostat R1.It is noted herein that the resistance of potentiometer R1
Value is necessarily less than the resistance of divider resistance R2, and otherwise circuit will cause self-locking state, Schmidt trigger cisco unity malfunction.
Through above-mentioned principle analysis, the non-rectangle signal of Signal-in (signal source) is transformed into after waveform shaping circuit processes
Square-wave signal, is exported by B point.
In the present embodiment, using NAND gate 74HC00N as gate control module, the T2 intervalometer of microcontroller is as control
The time-base signal of door trip processed, GATE end is connected to microcontroller STC89C52, when intervalometer starts timing when, makes GATE
Put 1, namely open gate, allow B point signal can enter into the step-by-step counting input of frequency divider, when 1S timing arrives it
After, STC89C52 allows again GATE drag down, and then adds up pulse number, allows GATE put 1 the most again, repeat the above steps.
As a kind of optimal way, described frequency divider 3 is made up of 8 binary adders.Described microcontroller 4 by
STC89S52 single-chip microcomputer and peripheral circuit thereof are constituted.Between described host computer 5 and microcontroller 4 by level switch module 6 even
Connecing, described level switch module 6 is the serial communication circuit being made up of MAX232 chip and peripheral circuit thereof.Additionally, this system
Also including power module 7, described power module 7 is for waveform shaping circuit 1, gate control module 2, frequency divider 3 and micro-
Controller 4 is powered.
The present embodiment uses 8 binary adders to constitute frequency divider, and 8 binary adders are entered by two 4 two
Adder chip 74HC393 processed is constituted.Wherein, the highest order of first four adder is received second four adder
Lowest order, then two clear terminal Clear are picked up and just constitute 8 adders, this Clear is control signal, connect
To the P1.0 of STC89C52, D0～D7 of frequency divider as data port, it is connected to the P2 mouth of STC89S52.In the present embodiment, adopt
With STC89S52 as microcontroller, this chip is that a cost is than relatively low processor, it is possible to meets the frequency measurement in system and wants
Ask, there are 8k bytes Flash, 512 bytes RAM, 3 16 bit timing devices/enumerators, 4 external interrupt, there is universal asynchronous string
Row mouth.
On this basis, invention additionally discloses a kind of high-precision wide frequency-domain frequency measuring method, the method is surveyed based on frequency
Amount system realizes, and frequency measuring system includes waveform shaping circuit 1, gate control module 2, frequency divider 3 and microcontroller 4,
In conjunction with shown in Fig. 1 to Fig. 4, this frequency measurement method comprises the steps:
Step S1, system initialization, initializes including intervalometer and serial ports initializes, and waveform shaping circuit 1 is by signal source 8
The waveshape signal shaping of output is transformed to square-wave signal, and gate control module 2 is closed；
Step S2, microcontroller judges whether to produce timer interruption, if then performing step S3, if otherwise repeating this step
Rapid S2；
Step S3, described microcontroller 4 sends control instruction to gate control module 2, to make gate control module 2 by institute
State square-wave signal to transmit to frequency divider 3；
Step S4, described frequency divider 3 square-wave signal is carried out scaling down processing after output pulse signal to microcontroller 4；
Step S5, the pulse count signal that frequency divider 3 is exported by described microcontroller 4；
Step S6, intervalometer arrives presets timing, and the timing of this intervalometer is preferably 1S, timeing closing device and
Gate control module 2, described microcontroller 4 converses signal frequency data according to pulse signal number and timing；
Step S7, signal frequency data are carried out frequently by the frequency measurement corrected parameter that described microcontroller 4 provides according to host computer 5
Rate is calibrated, and the signal frequency data after calibration are uploaded to host computer 5.
In said process, frequency measurement uses direct frequency measurement, with opening for gate for 1 second of the T2 of STC89C52 timing
The time-base signal closed, T0 and P2 mouth is as pulse data input, when starting T2 intervalometer, also starts T0 enumerator and starts meter
Rapid pulse rushes, and frequency divider often receives 256 pulses just D7 end in frequency divider 74HC393 chip and produces a carry signal,
Then carry signal is delivered to the P3.2 mouth (T0 external pulse input T0-INT) of microcontroller, when timing arrives, micro-control
Device processed reads the value of T0 intervalometer, represents with Nt0, then Nt0=(T0H*256+T0L), and T0H, T0L therein are respectively the height of T0
8 and the value of least-significant byte, value Np2 of P2 represents, then in the 1S time, the pulse number N=Nt0*256+Np2, N of statistics are exactly institute
Survey the frequency of signal.Frequency measurement data, after having calculated frequency, can be mail to host computer by microcontroller, and host computer can be according to letter
The magnitude range of number frequency, is sent to microcontroller by corresponding frequency measurement correction value by serial ports, and microcontroller can basis
Correction value carries out the correction of software dynamically to raw measurement results, thus ensure that either high-frequency signal or low frequency letter
Number, frequency-measurement accuracy is the highest.
About system main flow, when, after system electrification, first serial ports and intervalometer being initialized, follow subsequently into main
Ring waiting timer T2 interrupts occurring, and enters T2 interrupt processing function every time, it will be timed counting cumulative to calculate timing
Interval time, when timed interval reaches 1 second, frequency measurement control and the function of frequency calculating can be carried out by calling, enter letter
After number body, it is first shut off T0, T2, is then shut off gate, read the numerical value of T0 and P2 mouth, calculate frequency, repairing according to host computer
Original measurement value is modified by positive coefficient, is then dealt into host computer by serial ports, finally reopens T0, T2 intervalometer and lock
Door, continues to measure frequency.
The present embodiment, through experiment test, achieves good test result, refers to following table.
Wherein, correction value is the value estimated by the statistics relative error organizing frequency measurement array more, and can pass through
Program is adjusted by host computer during running, until frequency-measurement accuracy reaches requirement, in the frequency that 1HZ-16.7MHZ is wide
In the range of measurement, minimum error is close to 0.00%, and maximum error is less than 0.02%.
The above is preferred embodiment of the present invention, is not limited to the present invention, all technology models in the present invention
Enclose interior done amendment, equivalent or improvement etc., should be included in the range of the present invention protected.
Claims (10)
1. a high-precision wide frequency-domain frequency measures system, it is characterised in that include:
One waveform shaping circuit, its input is connected to signal source, and described waveform shaping circuit is for ripple signal source exported
Shape signal shaping is transformed to square-wave signal；
One gate control module, its input is connected to the outfan of waveform shaping circuit, and described gate control module is used for holding
Row control instruction and control the on/off of described square-wave signal；
One frequency divider, its input is connected to the outfan of gate control module, and described frequency divider is for believing described square wave
Number carry out output pulse signal after scaling down processing；
One microcontroller, is connected to the outfan of frequency divider and the control end of gate control module, described microcontroller
For to gate control module transmission control instruction, the pulse count signal exporting frequency divider also converses signal frequency number
According to, and according to frequency measurement corrected parameter, signal frequency data are calibrated；
One host computer, it is connected to microcontroller, for sending frequency measurement corrected parameter to microcontroller, and receives by microcontroller
Signal frequency data after the calibration that device is uploaded.
2. high-precision wide frequency-domain frequency as claimed in claim 1 measures system, it is characterised in that described waveform shaping circuit bag
Having included the first phase inverter, the second phase inverter, potentiometer and divider resistance, the front end of described potentiometer is used for connecting signal source, institute
The sliding end stating potentiometer is connected to the input of the first phase inverter, and it is anti-phase that the input of described second phase inverter is connected to first
The outfan of device, described divider resistance is connected between the input of the first phase inverter and the outfan of the second phase inverter, described
The outfan of the second phase inverter is used for exporting square-wave signal.
3. high-precision wide frequency-domain frequency as claimed in claim 2 measures system, it is characterised in that described gate control module bag
Having included the first NAND gate, an input of described first NAND gate and the outfan of the second phase inverter are connected, and described first
Another input of NAND gate is used for receiving the control instruction that microcontroller sends, and when described control instruction is 1 by described
Square-wave signal is connected, and described square-wave signal is disconnected when described control instruction is 0.
4. high-precision wide frequency-domain frequency as claimed in claim 3 measures system, it is characterised in that described first phase inverter, the
Within two phase inverters and the first NAND gate are integrated in the chip that model is 74HC00N, described first phase inverter will by one
The NAND gate of input short circuit is constituted, and the NAND gate of input short circuit is made up of by described second phase inverter another.
5. high-precision wide frequency-domain frequency as claimed in claim 3 measures system, it is characterised in that described frequency divider is by 8 two
System adder is constituted.
6. high-precision wide frequency-domain frequency as claimed in claim 1 measures system, it is characterised in that described microcontroller by
STC89S52 single-chip microcomputer and peripheral circuit thereof are constituted.
7. high-precision wide frequency-domain frequency as claimed in claim 1 measures system, it is characterised in that described host computer and microcontroller
Being connected by level switch module between device, described level switch module is the string being made up of MAX232 chip and peripheral circuit thereof
Port communications circuit.
8. high-precision wide frequency-domain frequency as claimed in claim 1 measures system, it is characterised in that also include power module,
Described power module is for powering to waveform shaping circuit, gate control module, frequency divider and microcontroller.
9. a high-precision wide frequency-domain frequency measuring method, it is characterised in that realize based on frequency measuring system, frequency measurement system
System includes waveform shaping circuit, gate control module, frequency divider and microcontroller, and this frequency measurement method includes walking as follows
Rapid:
Step S1, system initialization, the waveshape signal shaping that signal source is exported by waveform shaping circuit is transformed to square-wave signal,
Gate control module is closed；
Step S2, microcontroller judges whether to produce timer interruption, if then performing step S3, if otherwise repeating this step
S2；
Step S3, described microcontroller sends control instruction to gate control module, to make gate control module by described rectangle
Ripple signal transmits to frequency divider；
Step S4, described frequency divider square-wave signal is carried out scaling down processing after output pulse signal to microcontroller；
Step S5, the pulse count signal that frequency divider is exported by described microcontroller；
Step S6, intervalometer arrives presets timing, and timeing closing device and gate control module, described microcontroller is according to arteries and veins
Rush signal number and timing converses signal frequency data；
Step S7, the frequency measurement corrected parameter that described microcontroller provides according to host computer carries out frequency school to signal frequency data
Signal frequency data after calibration are uploaded to host computer by standard.
10. high-precision wide frequency-domain frequency measuring method as claimed in claim 9, it is characterised in that in described step S1, system
Initialization includes that intervalometer initializes and serial ports initializes；In described step S6, the timing of intervalometer is 1S.
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| CN108387778A (en) * | 2018-01-25 | 2018-08-10 | 周元忠 | A kind of Multifunctional frequency counter integrated circuit chip |
| CN109030939A (en) * | 2018-06-01 | 2018-12-18 | 中国人民解放军陆军工程大学石家庄校区 | A kind of multi-channel synchronous frequency measuring device |
| CN110441597A (en) * | 2019-06-21 | 2019-11-12 | 武汉玉航科技有限公司 | A kind of instantaneous wideband High-accuracy frequency measurement system |
| CN110489292A (en) * | 2019-08-22 | 2019-11-22 | 东莞铭普光磁股份有限公司 | The method and device of time-ordered measurement |
| CN110837000A (en) * | 2019-10-31 | 2020-02-25 | 电子科技大学 | Frequency measurement system based on FPGA |
| CN110836992A (en) * | 2019-10-31 | 2020-02-25 | 电子科技大学 | Oscillography power meter acquisition system based on FPGA |
| CN112611913A (en) * | 2020-12-24 | 2021-04-06 | 哈尔滨工业大学 | Time and frequency measuring device for teaching |
| CN112857401A (en) * | 2021-02-15 | 2021-05-28 | 北京瑞尔天天科技有限公司 | High-precision and high-stability frequency scale circuit |
| CN113589035A (en) * | 2021-09-11 | 2021-11-02 | 北京芯同汇科技有限公司 | Frequency measuring device and measuring method |
| WO2023201797A1 (en) * | 2022-04-22 | 2023-10-26 | 长鑫存储技术有限公司 | Frequency domain characteristic measurement method, apparatus and system, and storage medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61223662A (en) * | 1985-03-29 | 1986-10-04 | Fujitsu Ltd | Frequency measuring system |
| CN2060232U (en) * | 1988-09-02 | 1990-08-08 | 谢文梁 | High-precision intelligence cycle counter |
| CN201780332U (en) * | 2010-04-08 | 2011-03-30 | 上海第二工业大学 | Frequency meter |
| CN103063917A (en) * | 2012-12-26 | 2013-04-24 | 北京遥测技术研究所 | High-precision phase and frequence measuring system |
| CN204347131U (en) * | 2015-01-04 | 2015-05-20 | 皖西学院 | Intelligent frequency meter |
-
2016
- 2016-06-01 CN CN201610383554.3A patent/CN106093567A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61223662A (en) * | 1985-03-29 | 1986-10-04 | Fujitsu Ltd | Frequency measuring system |
| CN2060232U (en) * | 1988-09-02 | 1990-08-08 | 谢文梁 | High-precision intelligence cycle counter |
| CN201780332U (en) * | 2010-04-08 | 2011-03-30 | 上海第二工业大学 | Frequency meter |
| CN103063917A (en) * | 2012-12-26 | 2013-04-24 | 北京遥测技术研究所 | High-precision phase and frequence measuring system |
| CN204347131U (en) * | 2015-01-04 | 2015-05-20 | 皖西学院 | Intelligent frequency meter |
Non-Patent Citations (2)
| Title |
|---|
| 153893706: "《接口实验报告 基于VC++与C51的虚拟示波器和16MHz频率计》", 《豆丁网》 * |
| 康裕荣等: "《论施密特触发器》", 《赣南师范学院学报》 * |
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| CN108387778A (en) * | 2018-01-25 | 2018-08-10 | 周元忠 | A kind of Multifunctional frequency counter integrated circuit chip |
| CN109030939B (en) * | 2018-06-01 | 2020-08-28 | 中国人民解放军陆军工程大学石家庄校区 | Multichannel synchronous frequency measurement device |
| CN109030939A (en) * | 2018-06-01 | 2018-12-18 | 中国人民解放军陆军工程大学石家庄校区 | A kind of multi-channel synchronous frequency measuring device |
| CN110441597A (en) * | 2019-06-21 | 2019-11-12 | 武汉玉航科技有限公司 | A kind of instantaneous wideband High-accuracy frequency measurement system |
| CN110489292A (en) * | 2019-08-22 | 2019-11-22 | 东莞铭普光磁股份有限公司 | The method and device of time-ordered measurement |
| CN110489292B (en) * | 2019-08-22 | 2023-04-25 | 东莞铭普光磁股份有限公司 | Time sequence measurement method and device |
| CN110836992B (en) * | 2019-10-31 | 2020-12-01 | 电子科技大学 | Oscillography power meter acquisition system based on FPGA |
| CN110837000B (en) * | 2019-10-31 | 2020-12-01 | 电子科技大学 | Frequency measurement system based on FPGA |
| CN110836992A (en) * | 2019-10-31 | 2020-02-25 | 电子科技大学 | Oscillography power meter acquisition system based on FPGA |
| CN110837000A (en) * | 2019-10-31 | 2020-02-25 | 电子科技大学 | Frequency measurement system based on FPGA |
| CN112611913A (en) * | 2020-12-24 | 2021-04-06 | 哈尔滨工业大学 | Time and frequency measuring device for teaching |
| CN112611913B (en) * | 2020-12-24 | 2024-01-30 | 哈尔滨工业大学 | Time and frequency measuring device for teaching |
| CN112857401A (en) * | 2021-02-15 | 2021-05-28 | 北京瑞尔天天科技有限公司 | High-precision and high-stability frequency scale circuit |
| CN112857401B (en) * | 2021-02-15 | 2023-03-31 | 北京瑞尔天天科技有限公司 | High-precision and high-stability frequency scale circuit |
| CN113589035A (en) * | 2021-09-11 | 2021-11-02 | 北京芯同汇科技有限公司 | Frequency measuring device and measuring method |
| WO2023201797A1 (en) * | 2022-04-22 | 2023-10-26 | 长鑫存储技术有限公司 | Frequency domain characteristic measurement method, apparatus and system, and storage medium |
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