CN105510665B - A kind of online digital oscilloscope device based on controller of diesel generator set - Google Patents
A kind of online digital oscilloscope device based on controller of diesel generator set Download PDFInfo
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- CN105510665B CN105510665B CN201510851490.0A CN201510851490A CN105510665B CN 105510665 B CN105510665 B CN 105510665B CN 201510851490 A CN201510851490 A CN 201510851490A CN 105510665 B CN105510665 B CN 105510665B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
- G01R13/02—Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
- G01R13/02—Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
- G01R13/0218—Circuits therefor
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Abstract
The present invention provides a kind of online digital oscilloscope device based on controller of diesel generator set, which includes signal input unit, signal conditioning circuit, A/D converting unit, data processing unit and waveform display unit.Signal input unit by from controller ac voltage signal and ac current signal input signal conditioning circuit handle, the signal input A/D converting unit after signal and alternating current conditioning after obtained alternating voltage conditioning carries out A/D conversion, it obtains voltage sampling signal and current sampling signal and input data processing unit carries out conversion process and obtains voltage value and current value, waveform display unit carries out waveform to voltage value and current value and shows.The arrangement achieves digital oscilloscope function is integrated on controller of diesel generator set, can real-time online detection alternating voltage and electric current waveform, propose foundation to evaluate the quality of power supply.The equipment safety, reliable, cost is relatively low, is easily achieved.
Description
Technical field
The present invention relates to the Waveform display apparatus of controller of diesel generator set, in particular to a kind of to be based on diesel-driven generator
The online digital oscilloscope device of group controller.
Background technique
Diesel generating set is a kind of small-sized generating equipment, means using diesel oil as fuel, using diesel engine as prime mover band
The motive power machine device of dynamic electrical power generators.Diesel generating set is convenient for since its light and flexible, integrated level are high, easy to operate
The features such as maintenance, is widely used in ship, railway, mine, military affairs, communication, field construction and enterprises and institutions, administrative machine
The important places such as pass, use as common, spare or emergency power supply.
Controller of diesel generator set can provide intelligentized control method and safeguard protection for generating set, can detect and aobvious
Show every operating parameter, there are the control functions such as machine and shutdown, and automatic disposition in the event of a failure, protects equipment in time
With the safety of personnel.
Currently there are controller of diesel generator set, either foreign brand name home brands, although all
Three-phase voltage and electric current can be measured, be shown, but these parameters are all by original AC signal by true root mean square
It is that operation obtains as a result, the original waveform of these parameters does not provide.For paying close attention to the user of power quality, it usually needs make
Actual waveform is checked with electric power analysis instrument, however electric power analysis instrument price is expensive, wiring is complicated, and what is accessed is to hand over
High pressure is flowed, it is both inconvenient, it is also dangerous.
Summary of the invention
The purpose of the present invention is to provide a kind of online digital oscilloscope device based on controller of diesel generator set with
Solve the problems, such as that existing controller of diesel generator set can not directly display waveform.
To achieve the above object, the present invention provides a kind of online digital oscilloscope based on controller of diesel generator set
Device, comprising:
Signal input unit, signal conditioning circuit, A/D converting unit, data processing unit and waveform display unit；
The signal input unit is connected with the connecting terminal of the controller of diesel generating set, and receives and come from the control
The ac voltage signal and ac current signal of device processed；The ac voltage signal and ac current signal input the signal tune
It manages circuit and carries out signal processing, the signal after signal and alternating current conditioning after obtaining alternating voltage conditioning；The alternating current
The signal after signal and alternating current conditioning after pressure conditioning inputs the A/D converting unit and carries out A/D conversion, obtains voltage and adopts
Sample signal and current sampling signal；The voltage sampling signal and current sampling signal input the data processing unit, carry out
Conversion process obtains voltage value and current value；It is aobvious that the voltage value and current value input the waveform display unit progress waveform
Show.
Preferably, the controller is connected with diesel-driven generator, three-phase alternating voltage output line, the three-phase of diesel-driven generator
Alternating current output line, electric current common end and voltage N phase are held to be connect with 8 connecting terminals of controller respectively, and diesel oil is sent out
3 road ac voltage signals of motor and 3 road ac current signals input the controller.
Preferably, the signal conditioning circuit includes voltage signal conditioning circuit and current signal conditioning circuit, the electricity
Pressure signal conditioning circuit includes operational amplifier A1, resistance R1, resistance R2, resistance R3, resistance R4, capacitor C1, the resistance R3,
Capacitor C1 is in parallel, and one end of resistance R3, capacitor C1 in parallel are connected with the reverse input end of the operational amplifier A1, the other end
It is connected with the output end of the operational amplifier A1, the reverse input end of one end of the resistance R2 and the operational amplifier A1
It is connected, the other end is connected with resistance R1, and the ac voltage signal is inputted from the common end of resistance R1, resistance R2, through the fortune
Calculate the signal after amplifier A1 reduces after the resistance R4 exports the alternating voltage conditioning；
The current signal conditioning circuit includes that operational amplifier A2, operational amplifier A3, operational amplifier A4, operation are put
Big device A5, inductance L1 that the operational amplifier A2, operational amplifier A3 noninverting input are sequentially connected in series through one, resistance R5, electricity
Feel L2 to be connected, the operational amplifier A2, operational amplifier A3 reverse input end pass through one group of inductance and electricity in parallel respectively
Appearance connect with output end, the operational amplifier A2, operational amplifier A3 output end pass through a resistance and operation amplifier respectively
Device A4 reverse input end and noninverting input connection, the output end of the operational amplifier A5 is through inductance and resistance in parallel and fortune
The noninverting input connection of amplifier A4 is calculated, ac current signal is inputted through the common end of inductance L1, resistance R5, electric current common end
The signal of output is inputted by the common end of resistance R5, inductance L2, and the ac current signal is sampled by the resistance R5, is converted
For ac voltage signal, then by the operation amplifier after operational amplifier A2, operational amplifier A3, operational amplifier A4 amplification
The output end of device A4 exports the signal after the alternating current conditioning；
The signal after signal and alternating current conditioning after the alternating voltage conditioning inputs the A/D converting unit and carries out
A/D conversion, obtains the digital signal of voltage and the digital signal of electric current.
Preferably, the A/D converting unit is a single-chip microcontroller, the single-chip microcontroller is in a manner of DMA to the simulation shape of input
The signal after signal and alternating current conditioning after the alternating voltage conditioning of formula is scanned conversion to respectively obtain the voltage
Sampled signal and current sampling signal.
Preferably, having timer in the single-chip microcontroller, the timer is used to control sampling week when DMA scan transformation
Phase.
Preferably, the sampling period is 5kHz~8kHz.
Preferably, the first data buffer zone and the second data buffer zone are equipped in the A/D converting unit, first number
According to buffer area and the second data buffer zone for successively in turn write-in data and wherein a buffer area write expire after carry out data
Processing.
One of data buffer zone continues that data are written in another data buffer zone after writing completely, in another data
The data being written in full data buffer zone are write in processing while data are written in buffer area.
Preferably, the data processing unit includes a signal digital filtering module and signals revivification module, the signal
Digital filtering module is used to by median filtering algorithm carry out the voltage sampling signal and current sampling signal at digital filtering
Reason, obtains the voltage data and current data of digital filtering, and the signals revivification module is used for according to proven data, institute
The attenuation multiple for stating signal input unit and signal conditioning circuit calculates the voltage data of digital filtering and current data
Obtain the voltage value and current value.
Preferably, the waveform display unit is LCD display, the voltage value and current value input the LCD and show
Device carries out waveform and shows, wherein the voltage value and current value in a manner of mobile refresh from left to right mobile update in institute
State the actual waveform that voltage or electric current are shown on LCD display.
Preferably, the resolution ratio of the LCD display is 320*240 or more, what the LCD display transverse shifting refreshed
Between be divided into 10ms or less.
Online digital oscilloscope device provided by the invention based on controller of diesel generator set passes through setting signal tune
Circuit, A/D converting unit, data processing unit and waveform display unit are managed, realizes and digital oscilloscope function is integrated in bavin
On oily generator set controller, and the device is directed to the characteristic of diesel generating set, and data processing can be completed using single-chip microcontroller
And it is shown by LCD.
Generator waveform is shown by the device, is not necessarily to external other electric power oscilloscope apparatus, it can real-time online detection
The waveform of alternating voltage and electric current proposes foundation to evaluate the quality of power supply.The device of the invention is safe and reliable, cost is relatively low, easily
In realization, added value can be increased for controller of diesel generator set.
Detailed description of the invention
Fig. 1 is the online digital oscilloscope apparatus structure signal provided by the invention based on controller of diesel generator set
Figure；
Fig. 2 is the diesel generator controller and generator connection schematic diagram of the preferred embodiment of the present invention；
Fig. 3 is that the voltage signal conditioning circuit of the preferred embodiment of the present invention forms figure；
Fig. 4 is that the current signal conditioning circuit of the preferred embodiment of the present invention forms figure；
Fig. 5 is local data's display renderings of the preferred embodiment of the present invention.
Specific embodiment
In order to better illustrate the present invention, hereby with a preferred embodiment, and attached drawing is cooperated to elaborate the present invention, specifically
It is as follows:
As shown in Figure 1, the present invention provides a kind of online digital oscilloscope device based on controller of diesel generator set,
The device includes: that signal input unit 10, signal conditioning circuit 20, A/D converting unit 30, data processing unit 40 and waveform are aobvious
Show unit 50.
Signal input unit 10 is connected with the connecting terminal of the controller of diesel generating set, and receives from controller
Ac voltage signal and ac current signal；Ac voltage signal and ac current signal input signal conditioning circuit 20 are adopted
Sample processing, the signal after signal and alternating current conditioning after obtaining alternating voltage conditioning；Alternating voltage conditioning after signal and
Signal input A/D converting unit 30 after alternating current conditioning carries out A/D conversion, obtains voltage sampling signal and current sample letter
Number；Voltage sampling signal and current sampling signal input data processing unit 40 carry out conversion process and obtain voltage value and electric current
Value；Voltage value and current value input waveform display unit 50 carry out waveform and show.
As shown in Fig. 2, the controller in the present embodiment is UGC300 type controller, the controller and diesel-driven generator phase
Even, the signal input unit 10 in the present embodiment include 3 mutual inductors, 3 cartridge fuses (be typically mounted in control cabinet, can
According to power match) and its attached conducting wire composition.Three-phase alternating voltage output line L1, L2, L3 and voltage N of the diesel-driven generator
It is mutually connected by switch GB and load, for load supplying.When carrying out the number display of voltage, electric current, in the present invention, diesel oil
Three-phase alternating voltage output line L1, L2, L3 of generator export L1 phase current, L2 phase current, L3 phase current respectively, specifically lead to
It crosses L1 phase current to be connected by a mutual inductor with 54 feet of controller, L2 phase current passes through 55 foot phases of a mutual inductor and controller
Even, L3 phase current is connected by a mutual inductor with 56 feet of controller, so that mutual inductor exports three-phase alternating current；Diesel oil hair
The three-phase alternating voltage output line of motor passes through 3 cartridge fuses respectively and exports 3 ac voltage signals, specifically, this 3 friendships
Stream voltage signal passes through three-phase alternating voltage output line L1, L2, L3 respectively and is connected with 46 feet of controller, 47 feet and 48 feet；Electricity
Stream common end is connected with 58 feet of controller；Voltage N phase is held to be connect with 49 foot of controller, and 3 tunnels of diesel-driven generator are exchanged
Voltage signal and 3 road ac current signals input UGC300 type controller.
Signal input unit 10 is connected with the connecting terminal of the controller of diesel generating set, and receives from controller
Ac voltage signal and ac current signal are simultaneously inputted signal conditioning circuit 20.Wherein, signal conditioning circuit 20 includes electricity
Press signal conditioning circuit and current signal conditioning circuit.
As shown in figure 3, voltage signal conditioning circuit includes operational amplifier U55B, two concatenated 150 Ω resistance R282,
R283 can be considered that the resistance R1, four concatenated 1M Ω resistance R286, R287, R288, R289 of 300 Ω can be considered the resistance of 4M Ω
R2, resistance R290 is in parallel with capacitor C201C, one end and the operational amplifier of resistance R290 in parallel and capacitor C201C
The reverse input end 6 of U55B is connected, and the other end is connected with the output end 7 of operational amplifier U55B, one end of resistance R2 with state fortune
The reverse input end 6 for calculating amplifier U55B is connected, and the other end is connected with resistance R1；The output end 7 and electricity of operational amplifier U55B
It hinders R291 to be connected, resistance R291 is grounded by capacitor C200A；Ac voltage signal is inputted from the common end of resistance R1, resistance R2,
Signal after operational amplifier U55B diminution after the conditioning of the common end output AC voltage of resistance R291 and capacitor C200A.
In the present embodiment, operational amplifier U55B passes through resistance after the voltage of the ac voltage signal all the way of input is reduced 400 times
The half (1.65V) that R291 is biased to reference voltage exports the signal after improving for alternating voltage afterwards, for subsequent sampling.
As shown in figure 4, current signal conditioning circuit include 4 operational amplifiers be respectively operational amplifier U47D, U47C,
U49C, U49D, inductance RP18B, resistance of the noninverting input through being sequentially connected in series of operational amplifier U47D, operational amplifier U47C
R257, inductance RP18C are connected；The reverse input end 13 of operational amplifier U47D respectively by one group of inductance RP18A in parallel and
Capacitor C159A is connect with output end 14；The reverse input end 9 of operational amplifier U47C is respectively by one group of inductance in parallel
RP18D and capacitor C159B are connect with output end 8；The output end 14 of operational amplifier U47D is put by a resistance R251 with operation
The reverse input end 13 of big device U49D connects, and the output end 8 of operational amplifier U47C passes through a resistance R262 and operational amplifier
U49D noninverting input 12 connects；The output end 8 of operational amplifier U49C is through inductance C158B and resistance R261 in parallel and operation
The noninverting input 12 of amplifier U49D connects.In the circuit, ac current signal is through inductance RP18B, resistance R257 all the way
Common end input, and the signal of electric current common end output is by the common end input of resistance R257, inductance RP18C, resistance R257
Resistance value be 20m Ω, the alternating current of 0~5A is converted to 0~0.1V by the resistance sampling of the 20m Ω by ac current signal
Ac voltage signal, then after operational amplifier U47D, operational amplifier U47C, operational amplifier U49D amplification by 0~
The alternating voltage of 0.1V amplifies about 50 times, then reduces 3 times.And exported by the output end of operational amplifier U49D, wherein this implementation
In example, alternating voltage is biased to after 1.65V as the letter after alternating current conditioning by operational amplifier U49D by resistance R253
Number, it is sampled for subsequent.
Above-mentioned voltage signal conditioning circuit only handles the ac voltage signal all the way in 3 road voltage signals, similarly, above-mentioned
Current signal conditioning circuit only handles the ac current signal all the way in 3 road current signals.It will be appreciated by those skilled in the art that
Processing to 3 road ac voltage signal signals and to 3 road ac current signals to realize the present invention, signal provided by the invention
Conditioning circuit 20 includes 3 identical voltage signal conditioning circuits as shown in Figure 3 and 3 identical electricity as shown in Figure 4
Flow signal conditioning circuit.
A/D converting unit 30 in the present embodiment is a single-chip microcontroller, and single-chip microcontroller is preferably the LPC1788 chip of NXP company,
The chip is the microcontroller based on ARM Cortex-M3, highest frequency 120MHz, for processing requirement high integration and
The Embedded Application of low-power consumption.The chip has sdram interface and LCD interface, and 12 ADC with 8 channels, allows
With the polydispersity index of 400kHz.In the present invention, LPC1788 chip is in a manner of DMA to the alternating voltage of the analog form of input
The signal after signal and alternating current conditioning after conditioning is scanned conversion and is adopted with respectively obtaining voltage sampling signal and electric current
Sample signal, specifically, LPC1788 chip are scanned conversion to 6 channels AD in a manner of DMA, after above-mentioned voltage conditioning
Signal and alternating current conditioning after signal input the single-chip microcontroller by 6 channels AD.If in addition, having in the single-chip microcontroller
A timer is done, controls sampling period when DMA scan transformation in the present embodiment using one of timer.The present embodiment
In sampling period be 5kHz, i.e., every 200us is primary to the acquisition of 6 channels.
In other preferred embodiments, the sampling period can be 5kHz~8kHz, the available lesser electricity of the distortion factor
Press signal and current signal.
In addition, being equipped with the first data buffer zone and second in LPC1788 chip in order to avoid the read/write conflict of sampled data
Data buffer zone, the first data buffer zone and the second data buffer zone for being successively written data and wherein a buffering in turn
Area carries out data processing (reading) after writing completely.
Specifically, continue that data are written in another data buffer zone after one of data buffer zone is write completely,
The data write and be written in full data buffer zone are handled while data are written in another data buffer zone, successively
The data write-in and processing recycled in turn.
Data processing unit 40 includes a signal digital filtering module and signals revivification module, and signal digital filtering module is used
In voltage sampling signal and current sampling signal are carried out digital filtering processing by median filtering algorithm, the electricity of digital filtering is obtained
Press data and current data；Signals revivification module is used for basis, and (nominal data is surveyed in apparatus of the present invention to proven data
Before amount (before exfactory inspection), has the linear amendment data that Actual measurement obtains by reference signal generator, be used to thermal compensation signal
The difference of conditioning circuit, to achieve the purpose that eliminate systematic error), the signal input unit of the present apparatus and signal conditioning circuit
Attenuation multiple carries out the voltage data of digital filtering and current data that voltage value and current value is calculated.In the present embodiment,
For 12 AD, the data area of sampling is 0-0xFFF, therefore each sampled value needs 2 bytes to indicate.The number of acquisition
According to the conversion for needing to carry out voltage and current before display, by signal digital filtering module and signals revivification module by source code
Value is converted to actual voltage value and current value.
Waveform display unit in the present embodiment is LCD display, and voltage value and current value input LCD display carry out wave
Shape is shown, wherein voltage value and current value in a manner of mobile refresh from left to right mobile update to show on an lcd display
The actual waveform of voltage or electric current.
The resolution ratio of LCD display is 320*240 or more, the interval that LCD display transverse shifting refreshes in the present embodiment
For 10ms or less.Data always carry out mobile update from left to right, and the indication range of whole screen data is adjustable, as shown in following table one:
Table one: the whole screen of LCD display shows time range under different situations
| Time/lattice | The time range that whole screen is shown |
| 20ms/div | 0.16 second |
| 50ms/div | 0.4 second |
| 100ms/div | 0.8 second |
| 200ms/div | 1.6 the second |
| 500ms/div | 4 seconds |
| 1000ms/div | 8 seconds |
For final local display effect as shown in figure 5, in example shown in the figure, the resolution ratio of LCD display is 800*
480, the display area of waveform is laterally using 800 pixels, is divided into 8 lattice, and 100 pixels of every lattice are divided between mobile refreshing
0.1s.The data of sampling are handled by display, it will be able to be directly viewable power supply by the apparatus of the present invention being arranged on controller
Actual waveform.It, can also be further to transient overvoltage, voltage surge, voltage sag, voltage pause, electricity by Wave data
Pressure harmonic wave etc. carries out calculating analysis.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those skilled in the art in the technical scope disclosed by the present invention, to deformation or replacement that the present invention is done, should be covered
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the scope of protection of the claims.
Claims (8)
1. a kind of online digital oscilloscope device based on controller of diesel generator set characterized by comprising signal input
Unit, signal conditioning circuit, A/D converting unit, data processing unit and waveform display unit；
The signal input unit is connected with the connecting terminal of the controller of diesel generating set, and receives and come from the controller
Ac voltage signal and ac current signal；The ac voltage signal and ac current signal input the signal condition electricity
Road carries out signal processing, the signal after signal and alternating current conditioning after obtaining alternating voltage conditioning；The alternating voltage tune
The signal after signal and alternating current conditioning after reason inputs the A/D converting unit and carries out A/D conversion, obtains voltage sample letter
Number and current sampling signal；The voltage sampling signal and current sampling signal input the data processing unit, are converted
Processing obtains voltage value and current value；The voltage value and current value input the waveform display unit progress waveform and show；Institute
It states controller to be connected with diesel-driven generator, three-phase alternating voltage output line, the three-phase alternating current output line, electricity of diesel-driven generator
Stream common end and voltage N phase are held and are connect respectively with 8 connecting terminals of controller, by 3 road alternating voltages of diesel-driven generator
Signal and 3 road ac current signals input the controller；The signal conditioning circuit includes voltage signal conditioning circuit and electricity
Signal conditioning circuit is flowed, the voltage signal conditioning circuit includes operational amplifier A1, resistance R1, resistance R2, resistance R3, resistance
R4, capacitor C1, the resistance R3, capacitor C1 are in parallel, and one end of resistance R3, capacitor C1 in parallel are with the operational amplifier A1's
Reverse input end is connected, and the other end is connected with the output end of the operational amplifier A1, one end of the resistance R2 and the fortune
The reverse input end for calculating amplifier A1 is connected, and the other end is connected with resistance R1, and the ac voltage signal is from resistance R1, resistance R2
Common end input, the letter after operational amplifier A1 diminution after the resistance R4 exports alternating voltage conditioning
Number；
The current signal conditioning circuit includes operational amplifier A2, operational amplifier A3, operational amplifier A4, operational amplifier
A5, inductance L1 that the operational amplifier A2, operational amplifier A3 noninverting input are sequentially connected in series through one, resistance R5, inductance L2
Be connected, the operational amplifier A2, operational amplifier A3 reverse input end pass through respectively one group of in parallel inductance and capacitor with
Output end connection, the operational amplifier A2, operational amplifier A3 output end pass through a resistance and operational amplifier A4 respectively
The output end of reverse input end and noninverting input connection, the operational amplifier A5 is put through inductance and resistance in parallel with operation
The noninverting input connection of big device A4, ac current signal are inputted through the common end of inductance L1, resistance R5, the output of electric current common end
Signal by the common end input of resistance R5, inductance L2, the ac current signal samples by the resistance R5, is converted to friendship
Voltage signal is flowed, then by the operational amplifier A4 after operational amplifier A2, operational amplifier A3, operational amplifier A4 amplification
Output end export the signal after alternating current conditioning；
The signal after signal and alternating current conditioning after the alternating voltage conditioning inputs the A/D converting unit and carries out A/D
Conversion, obtains the digital signal of voltage and the digital signal of electric current.
2. the online digital oscilloscope device according to claim 1 based on controller of diesel generator set, feature exist
In the A/D converting unit is a single-chip microcontroller, and the single-chip microcontroller is in a manner of DMA to the alternating voltage of the analog form of input
The signal after signal and alternating current conditioning after conditioning is scanned conversion to respectively obtain the voltage sampling signal and electricity
Flow sampled signal.
3. the online digital oscilloscope device according to claim 2 based on controller of diesel generator set, feature exist
In with timer in the single-chip microcontroller, the timer is for controlling sampling period when DMA scan transformation.
4. the online digital oscilloscope device according to claim 3 based on controller of diesel generator set, feature exist
In the sampling period is 5kHz~8kHz.
5. the online digital oscilloscope device according to claim 1 or 2 based on controller of diesel generator set, feature
Be, be equipped with the first data buffer zone and the second data buffer zone in the A/D converting unit, first data buffer zone and
Second data buffer zone is used to that data to be successively written in turn and a buffer area carries out data processing after writing completely wherein.
6. the online digital oscilloscope device according to claim 1 based on controller of diesel generator set, feature exist
In the data processing unit includes a signal digital filtering module and signals revivification module, the signal digital filtering module
For the voltage sampling signal and current sampling signal to be carried out digital filtering processing by median filtering algorithm, digital filter is obtained
The voltage data and current data of wave, the signals revivification module are used for single according to proven data, signal input
The attenuation multiple of member and signal conditioning circuit carries out the voltage data of digital filtering and current data that the voltage is calculated
Value and current value.
7. the online digital oscilloscope device according to claim 1 based on controller of diesel generator set, feature exist
In the waveform display unit is LCD display, and it is aobvious that the voltage value and current value input the LCD display progress waveform
Show, wherein the voltage value and current value in a manner of mobile refresh from left to right mobile update on the LCD display
Show the actual waveform of voltage or electric current.
8. the online digital oscilloscope device according to claim 7 based on controller of diesel generator set, feature exist
In the resolution ratio of, the LCD display be 320*240 or more, the LCD display transverse shifting be divided between refreshing 10ms with
Under.
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