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2.2 Modulation Waveform Setup

Press

to output modulated waveforms.

function signal generators can output

modulation waveforms of AM, FM, PM, ASK, FSK and PSK. Set different modulation
parameters according to different modulation types.



In amplitude modulation, internal modulation/external modulation, frequency, depth and

modulation waveforms can be set.



In frequency modulation, internal modulation/external modulation, frequency, frequency

deviation and modulation waveforms can be set.



In phase modulation, internal modulation/external modulation, frequency, phase deviation

and modulation waveforms can be set.



In ASK modulation, internal modulation/external modulation, frequency and modulation

amplitude can be set.



In FSK modulation, internal modulation/external modulation, frequency and

frequency-hopping can be set.



In PSK modulation, internal modulation/external modulation, frequency and modulation

phase can be set.

Settings of various modulation parameters will be introduced respectively in the following parts,
based on modulation types.

2.2.1 Amplitude Modulation (AM)

Modulated waveforms consist of carrier waves and modulation waveforms. In AM (Amplitude

Modulation), the amplitude of the carrier wave changes with the instantaneous voltage of the

modulation waveform.

The carrier wave for amplitude modulation can be set through the function keys

of

on the front panel.

Press

→ Type→ AM and enter the interface as shown in Figure 2-21.

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Summary of Contents for ET3325

Page 1: ...ET3325 Function Arbitrary Waveform Generator User Manual HANGZHOU ZHONGCHUANG ELECTRON CO LTD ...

Page 2: ...e 17 2 1 5 Set noise wave 19 2 1 6 Set arbitrary wave 20 2 2 Modulation Waveform Setup 28 2 2 1 Amplitude Modulation AM 28 2 2 2 Frequency Modulation FM 30 2 2 3 Phase Modulation PM 31 2 2 4 Amplitude Shift Keying ASK 33 2 2 5 Frequency Shift Keying FSK 34 2 2 6 Phase Shift Keying PSK 35 2 3 Frequency Sweep Waveform Setup 37 2 4 Burst Waveform Setup 39 2 5 Sync Output CH1 42 2 6 Frequency Meter 43...

Page 3: ...2 3 1 Product Technical Indicators 53 3 2 General Technical Specifications 59 4 Appendices 59 Appendix A Accessories 59 Appendix B Maintenance and Cleaning 60 ...

Page 4: ...ge ET3325 output with the highest output frequency is ET3310 Model is 10MHz ET3325 Model is 25MHz ET3340 Model is 40MHz ET3360 Model is 60MHz and ET 3370 Model is 70MHz Sampling rate 160MSa S vertical resolution 12 bit and storage depth 16k 5 basic waveforms and 32 arbitrary waveforms in built Pulse wave output set in edge time Internal external AM FM PM ASK FSK and PSK modulation function Output ...

Page 5: ...g of function and usage Front panel includes liquid crystal keys and output terminal and so on Keys include Function mode reusable keys numeric keys and direction keys knobs Figure 1 1 Front panel The rear panel consists of input terminal communication interface and power interface Figure 1 2 Rear Panel 1 2 Introduction to Interface ...

Page 6: ...ea will turn to sine signal and show Sine in the status area Sine waves of different parameter values are accessible through the setup of frequency cycle amplitude high level offset low level and phase 2 Press waveform display area will turn to square signal and show Square in the status area Square waves of different parameter values are accessible through the setup of frequency cycle amplitude h...

Page 7: ...n the status area Noise waves of different parameter values are accessible through the setup of amplitude high level and offset low level 6 Press waveform display area will turn to arbitrary signal and show Arb in the status area Arbitrary waves of different parameter values are accessible through the setup of frequency cycle amplitude high level offset low level and phase 7 Press to switch channe...

Page 8: ... and trigger is manual trigger outputs signal for once if pressing the trigger key For non manual trigger manual trigger would realized by pressing the trigger key 1 5 Modulation Frequency Sweep Burst Output Setup ET3340 keys on the right side of waveform are for the output of modulation frequency sweep and burst respectively which function is for Channel 1 only The following specifications will o...

Page 9: ...ts of keys are on the front panel which are numeric keypad left right direction keys and knobs and confirmation cancellation key The following specifications will offer you guidance on the use of digital input Figure 1 7 Numeric keypads direction keys and knobs and confirmation cancellation key Direction keys Switch of digits and system setup interface for menu selection The left key is applicable...

Page 10: ...and 2 buzzer switch language switch file storage interface information and system information execute instrument calibration and system update 3 Press to check assistance information list 2 Advanced Operation Instructions You have acquired preliminary knowledge on the functions of keys and knobs of all functional areas on the front panel of ET3340 and are able to make basic operation on function a...

Page 11: ...or will be in the location of frequency parameter in the parameter display area in which user could alter the frequency value of sine wave through numeric keypad direction keys or knobs Figure 2 1 Display Interface of Setup of Sine Wave Parameters Table 2 1 Sine Waveform Menu Description Functional menu Setup Description Frequency cycle Set waveform frequency or cycle Amplitude high level Set wave...

Page 12: ... keypad use left direction key for backspace to delete previous digit press the cancellation key to cancel digit input for misoperation To input value through knobs use direction keys to alter the digit with the subscript of horizontal bar for tracking Then turn the knob to alter the digit to obtain the desired value Set output amplitude 1 Press amplitude to set the parameter value of amplitude Th...

Page 13: ... The displayed offset voltage is either the power on default value or the offset previously selected Use the current value if the offset is valid for the new waveform when changing parameters 2 Enter the desired amplitude Use numeric keypad or knobs to enter the desired parameter value Select the unit desired by offset and press the softkey corresponding to the desired unit Figure 2 4 Setup Parame...

Page 14: ... Initial Phase 2 1 2 Square wave setup Press and the operation menu of square wave will be displayed at the bottom of the screen Use operation menu of square wave to set its output waveform parameters Major parameters of square wave include frequency cycle amplitude high level offset low level duty cycle and phase Different square waves are obtained by altering these parameters As shown in Figure ...

Page 15: ...ave high level in the whole cycle 100kHz 1 99 100 kHz 5MHz 20 80 5MHz 10MHz 40 60 Set duty cycle 1 Press duty cycle to set the parameter value of duty cycle The displayed duty cycle is either the power on default value or the value previously selected Use the current value if it is valid for the new waveform when changing parameters 2 Enter the desired duty cycle Use numeric keypad or knobs to ent...

Page 16: ...veform parameters Major parameters of ramp wave include frequency cycle amplitude high level offset low level symmetry and phase Different ramp waves are obtained by altering these parameters As shown in Figure 2 8 select Symmetry in the menu of softkey and the parameter value corresponding to symmetry will be selected in the parameter display area in which users could alter the value of symmetry ...

Page 17: ...y the percentage of setup ramp waveform in rise in the whole cycle Range 0 100 Set symmetry 1 Press symmetry to set parameter value of symmetry The displayed symmetry is either the power on value or the percentage previously selected Use the current value if it is valid for the new waveform when changing parameters 2 Enter the desired symmetry Use numeric keypad or knobs to enter the desired param...

Page 18: ...n menu of pulse wave to set its output waveform parameters Major parameters of pulse wave include frequency cycle amplitude high level offset low level pulse width duty cycle and rising edge falling edge Different pulse waves are obtained by altering these parameters Specific interface is shown in Figure 2 10 Figure 2 10 Interface for Setup of Pulse Waveform Parameters ...

Page 19: ...sing edge and to the 50 threshold value in the range of next falling edge Set pulse width 1 Press duty cycle pulse width pulse width The displayed pulse width on screen is either the power on default value or the pulse width previously selected Use the current value if it is valid for the new waveform when changing parameters 2 Enter the desired pulse width Use numeric keypad or knobs to enter the...

Page 20: ...le is 1ms pulse is 500us and duty cycle is 50 duty cycle will turn to 20 after pulse width is set to 200us Set rising falling edge 1 Press leading edge 2 Enter the desired pulse rising edge 3 Press rising falling edge falling edge 4 Enter the desired pulse falling edge 2 1 5 Set noise wave Press and the operation menu of noise wave will be displayed at the bottom of the screen Use operation menu o...

Page 21: ...wave to set its output waveform parameters Major parameter of arbitrary waveform include frequency period amplitude high level offset low level and phase Different arbitrary waves are obtained by altering these parameters Specific interface is shown in Figure 2 13 Figure 2 13 Display Interface for Setup of Parameter Values of Arbitrary Waveform Table 2 6 Arb Waveform Menu Description Functional me...

Page 22: ...14 Arbitrary Wave Loading Table 2 7 Loading Arbitrary Wave Selection Menu Description Functional menu Setup Description Built in Select ET3310 of the 32 kinds of arbitrary waves built in Storage Select arbitrary waveforms stored in the nonvolatile storage Volatile wave Select arbitrary waveforms stored in the volatile storage and the old wave will be overwritten when a new ET3310 stored in Cancel ...

Page 23: ...22 1 Press Waveforms Loading Built in and enter the following interface 2 Position the desired waveform by the knobs or direction keys 3 Select the waveform ...

Page 24: ...irUD StairDn PPluse Select common waveforms Mathematics ExpRise ExpFall Tan Cot Sqrt Arb_X2 Sinc Gauss Select common mathematical functions Window functions Boxcar Barlett Triang Blackman Hamming Hanning Kaiser Select common window functions Others DC Composite Tanh Coth Gamma Legendre chebyshev Bessel StepResp Select other waveforms Selection Select the selected waveform ...

Page 25: ...ctional menu Setup Description Mode Local U disk Switch storage mode Read Read the stored arbitrary waveform Storage Store the arbitrary waveforms stored in the volatile storage Delete Delete the stored arbitrary waveform desired Cancel Cancel stored arbitrary wave reading Create user defined waveforms Signal generator can edit arbitrary waveform and users can create any new waveforms by point ini...

Page 26: ...rm editor Storage Store the user defined arbitrary waves edited Interpolation linearity ON OFF Enable or disable linear interpolation between defined points of the waveforms Point edit Define waveforms by specifying voltage value for each waveform point Select point edit and enter the interface as shown in Figure 2 18 First edit the first point Press Voltage to edit the voltage value of the curren...

Page 27: ...gure 2 19 and store the waveform in nonvolatile memory or external memory Figure 2 19 Store Edited Arbitrary Waveforms Note In the nonvolatile storage only ET3310 waveform can be stored in each waveform storage location and the old wave will be overwritten when a new ET3310 stored in Edit waveforms Press Waveform Edit to enter edit interface ...

Page 28: ...ct arbitrary waveforms need to be edited which can be built in arbitrary waveforms arbitrary waveforms or volatile waveforms stored in the volatile storage Upper limit Set create point voltage upper limit Lower limit Set create point voltage lower limit Point Edit Start waveform editor Storage Store the user defined arbitrary waves edited ...

Page 29: ...odulation internal modulation external modulation frequency and modulation amplitude can be set In FSK modulation internal modulation external modulation frequency and frequency hopping can be set In PSK modulation internal modulation external modulation frequency and modulation phase can be set Settings of various modulation parameters will be introduced respectively in the following parts based ...

Page 30: ...Sine Square Triangle UpRamp DnRamp External modulation Depth When selecting external modulation the modulation signal can be input by the Modulation In on the rear panel and only Depth needs to be set here Note Modulation depth refers to amplitude variation range also called Percentage Modulation settings Modulation depth can vary from 0 to 120 Modulation at 0 the output amplitude is half of the s...

Page 31: ...he frequency of the carrier wave changes with the instantaneous voltage of the modulation waveform The carrier wave for frequency modulation can be set with the function keys of on the front panel Press Type FM and enter the interface as shown in Figure 2 22 Figure 2 22 FM Waveform Parameter Setup Interface Table 2 13 FM Parameter Setup Menu Description Functional menu Setup Description Types FM S...

Page 32: ...on waveforms In PM Phase Modulation the phase of the carrier wave changes with the instantaneous voltage of the modulation waveform The carrier wave for phase modulation can be set with the function keys of on the front panel Press Type PM and enter the interface as shown in Figure 2 23 Internal modulation Frequency Set modulation wave frequency 2mHz 20kHz Frequency offset Set the offset between t...

Page 33: ...menu Setup Description Types PM Select PM Signal source Internal external Select internal external modulation Internal modulation Frequency Set modulation wave frequency 2mHz 20kHz Phase offset Set the offset between the phase of modulation and the carrier Modulation wave Select internal modulation signal Sine Square Triangle UpRamp DnRamp External modulation Phase offset When external modulation ...

Page 34: ...hifts between carrier amplitude and modulation amplitude is determined by the specified ASK frequency When the external modulation is selected ASK frequency cannot be adjusted and is determined by the signal level on the rear panel Ext Trig connector When a logic high level is present the larger value between carrier amplitude and modulation amplitude is output With a logic low level the smaller v...

Page 35: ... Hop Frequency The frequency at which the output shifts between carrier frequency and hop frequency is called FSK frequency The frequency at which the output shifts between these ET3325 frequencies is determined by the internal frequency generator or the signal level on the rear panel Ext Trig connector When the internal modulation is selected the frequency at which the output shifts between carri...

Page 36: ...ion Hop frequency When the external modulation is selected the modulation signal is input by the FSK on the rear panel Only Hop Frequency parameters need to be set 2 2 6 Phase Shift Keying PSK PSK modulation is to shift its output phase between ET3325 preset values Carrier Phase and the Modulation Phase The phase at which the output shifts between carrier phase and modulation phase is called PSK p...

Page 37: ... logic low level the modulation phase is output The carrier wave for PSK modulation can be set with the function keys of on the front panel Press Type PSK and enter the interface as shown in Figure 2 26 Figure 2 26 PSK Waveform Parameter Value Setup Interface Table 2 17 PSK Parameter Setup Menu Description Functional menu Setup Description Types PSK Select PSK Signal source Internal external Selec...

Page 38: ...40 outputs variously from the start frequency to the stop frequency in specified time Sweep waveform can be produced with sine square ramp pulse or arbitrary waveforms noise and DC are not allowed to be scanned Press and the system will display the operation menu as shown in Figure 2 27 Set the output waveform parameters of the sweep wave by operating the sweep menu Figure 2 27 Sweep Mode Paramete...

Page 39: ...p will start and a continuous press of the key will trigger the signal generator once again Time Set the number of seconds needed from the start frequency to the stop frequency Start Set the start frequency Stop Set the stop frequency Note To sweep up in frequency set the start frequency the stop frequency To sweep down in frequency set the start frequency the stop frequency In manual trigger mode...

Page 40: ...28 Figure 2 28 N cycle Burst Setup Interface Table 2 19 N cycle Burst Parameter Setup Menu Description Functional menu Setup Description Types N cycle infinite g ated Select burst output type N cycle Signal source Internal external ma nual Select Trigger Source Internal select internal trigger source External select external trigger source use Ext Trig connector on rear panel Manual select manual ...

Page 41: ...from 0 to 360 with default of 0 For arbitrary waveforms 0 is the first waveform point Period Set time from the start of an N cycle burst to the start of next burst If necessary the burst period will increase to allow a specified number of cycles of each burst Period single waveform period the number of burst Set infinite burst Press Type Infinite and enter the interface as shown in Figure 2 29 Fig...

Page 42: ...ual select manual trigger and each time you press Trig a burst will output and a continuous press of the key will trigger the signal generator once again Phase Set the burst initial phase Set gated burst Press Type Gated and enter the interface as shown in Figure 2 30 Figure 2 30 Gated Burst Setup Interface Table 2 21 Infinite Burst Parameter Setup Menu Description Functional menu Setup Descriptio...

Page 43: ...quare waves of 50 duty cycle During the first half modulation waveform period the sync signal is a TTL High level For external modulated AM FM and PM the sync signal takes carriers not modulation wave as references and the sync signal is square waves of 50 duty cycle For ASK the sync signal takes the modulation amplitude as a reference and the sync signal is square waves of 50 duty cycle For the m...

Page 44: ... frequency values measured is shown in the central screen The external signal is input by the Counter interface on the rear panel Figure 2 31 Frequency Meter Interface Note When there is an external frequency signal input the screen value will refresh regularly if the external frequency signal is disconnected the refresh stops and the screen retains the last frequency value ...

Page 45: ...nd read the state files inside the function signal generator and also support the creating and deleting operations to the state and data files on the USB storage device Interface information provides USB PID and VID information inquiry and RS232 interface information inquiries Calibration provides the amplitude and offset calibration of the machine itself System upgrades include front panel upgrad...

Page 46: ...c interface being shown below Figure 2 33 Channel 1 Output Parameter Setup To set the output impedance as 50Ω press 50Ω to set high impedance press High Z 2 Press CH1 Select and enter Channel 2 output impedance setup interface 2 7 2 System setup Press System Select and enter the following interface Figure 2 34 System Setup Interface ...

Page 47: ...guage displayed by the OS System Select Language and adjust language types in screen operation 2 7 3 File storage Press File Storage Select the screen displays file storage interface as shown below by which you can store and read the state files inside the function signal generator and also support creating and deleting operations to the state and data files on the USB storage device The file name...

Page 48: ...embers the selected function including arbitrary waveform frequency amplitude offset voltage duty cycle symmetry phase and any other modulation parameters used Specific operations of instrument state storage are as follows 1 Select the state file type press type state contents and enter the instrument state storage interface 2 Select the file storage location There are 10 local storage locations s...

Page 49: ...file After input completed press Finish and the file is stored Figure 2 37Arb Data Storage Interface U disk storage usage As shown in the figure the interface mode is divided into local and U disk The left side of the front panel is equipped with a USB interface when the USB storage is inserted the upper right corner of the interface will show 1 Install the Removable Storage Insert the removable s...

Page 50: ...igure 2 38 USB Storage Usage File name Input The file name input supports only English characters and in U disk storage the input characters will be automatically converted to capital letters Specific interface is shown in Figure 2 39 Figure 2 39 File Name Input Interface 1 Use the knob to adjust the left and right positions of the input keyboard cursor when the letter is selected press the Select...

Page 51: ...l generator has been calibrated when leaving the factory We do not recommend users to calibrate individually Contact the local dealer for calibration services 2 7 6 System upgrade System upgrades contains THREE 40MHZ modules software module communication module and logic module The system supports U disk upgrade When the U disk is inserted the system will automatically detect the upgrade file pack...

Page 52: ... to change 3 Data can be modified by the knobs or numeric keys 4 Press the Channel 1 Output key to output waveforms 2 How to generate modulation signal Take the carrier and sine as an example 1 Enter the Sine wave editing interface to edit the waveform 2 Press the Mod key to enter the modulation interface to edit parameters 3 Press the Channel 1 Output key to output 4 To change carrier data press ...

Page 53: ...ent is working in remote mode there is an icon on the upper right corner of the user interface and the front panel keys are locked Here you can return to the local operating mode by pressing the key 2 9 1 Establishment of communication between instrument and the PC Connect the PC with a USB For USB driver installation users can install the USB driver software in the CD ROM to the PC Specific steps...

Page 54: ...o not use USB and RS232 interfaces simultaneously The instrument will lock the port after receiving data and if using them simultaneously it may lead to the other ET3310 unworking or working abnormally 3 Technical Specifications Unless specified otherwise all technical specifications apply to ET3325 function arbitrary waveform generators Signal generator must meet the following requirements at fir...

Page 55: ...Hz 100uHz 10MHz Arbitrary wave 1uHz 5 MHz 1uHz 5MHz 1uHz 10MHz 1uHz 10MHz 1uHz 10MHz Frequency Resolution 1uHz Frequency Accuracy 5ppm Sine Wave Characteristics Harmonic distortion CH1 1Vpp 0 1MHz 45dBc 1MHz 10MHz 40dBc 10MHz 20MHz 30dBc 20MHz 40MHz 25dBc 40MHz 70MHz 20dBc Harmonic distortion CH2 1Vpp 0 1MHz 45dBc 1MHz 40MHz 40dBc 40MHz 70MHz 35dBc Total harmonic distortion 0 2 20Hz 20kHz 1Vpp Squ...

Page 56: ...ve Characteristics Sampling speed 160MSa S Waveform amplitude resolution CH1 12bits Waveform amplitude resolution CH2 10bits Waveform length CH1 16k Waveform length CH2 4k Minimum rise fall time 20ns Jitter 6ns 30ppm Storage quantity 10 waveforms Output Characteristics Amplitude 50Ω CH1 Range 1mVpp 10Vpp 20MHz 1mVpp 5Vpp 20MHz CH2 Range 1mVpp 3Vpp 20MHz Accuracy 1 set value 1mVpp 1kHz Sine 0 offse...

Page 57: ...rcuit protection automatically disables the waveform output when overloading SYNC Output Level TTL compatibility Impedance 50Ω Rise fall time 25ns Maximum frequency 25MHz AM Modulation CH1 Carrier wave Sine square ramp pulse and arbitrary waveforms excluding DC Source Internal external Modulation wave Sine square triangle and ramp Modulation frequency 2mHz 20kHz Modulation depth 0 120 FM Modulatio...

Page 58: ...Modulation wave Square wave of 50 duty ratio Keying frequency 2mHz 1MHz PSK Modulation CH1 Carrier wave Sine square ramp pulse or arbitrary waveforms excluding DC Source Internal external Modulation wave Square wave of 50 duty ratio Modulation phase 0 360 PM Modulation CH1 Carrier wave Sine square ramp pulse or arbitrary waveforms excluding DC Source Internal external Modulation wave Square wave o...

Page 59: ...65535 or infinite gated Start stop phase 0 360 Internal period 1us 500s Gating source External Trigger source Internal external manual operating Frequency Meter Frequency range 1Hz 200MHz Frequency resolution 6 bit s Voltage range and sensitivity 100mVpp 5Vpp Input adjustment input impedance 1MΩ coupled modes AC Trigger Input Level TTL compatibility Slope Rise Fall Pulse width 100ns Reaction time ...

Page 60: ...operation 10 60 Cooling methods Natural cooling Humidity range Below 35 90 relative humidity 35 40 60 relative humidity Interface RS232 USB Host USB Device 4 Appendices Appendix A Accessories Standard accessories 1 piece of 30A51 ET3340 wire power line 1 piece of 33A52 BNC coaxial cable 1 CD ROM Optional accessories BNC alligator clip line 33P01 Cabinet installation suit 32P02 RS232 serial line 32...

Page 61: ... Clean the instrument regularly based on practice Specific methods are as follows 1 Disconnect power 2 Wipe the dust outside of the instrument with a damp but not dripping soft cloth mild cleaner or water can be used When cleaning the LCD be careful not to scratch the transparent LCD protection screen Warning Before re power on make sure the instrument is completely dry to avoid electrical short c...

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