Tenma 72-3555 Скачать руководство пользователя

Страница: 39 / 58

OUTPUTTING FREQUENCY SWEEP WAVEFORMS

•

In Frequency Sweep, the Generator, within the specified sweep time, steps from

start frequency to stop frequency with linear or logarithmic spacing.

•

Internal, external and manual trigger source are available to select. The Generator

can sweep sine, square, ramp and arbitrary waveforms.

•

CH1 and CH2 can be modulated independently with modulation types applied with

the same one or different ones.

Enabling Frequency Sweep

•

Press

Menu→Sweep

to enable the Sweep

function and with the function enabled,

the Generator will output sweep waveform

according to current settings.

Selecting Frequency Sweep Waveforms

•

With Sweep enabled, press

Carrier

to access

sweep waveforms and reveal the interface as

shown right.

Start Frequency and Stop Frequency

•

The start frequency and stop frequency specify

the high and low limits for frequency sweep.

•

The Generator always moves from the start

frequency to stop frequency, and returns to the

start frequency again.

•

To set start frequency or stop frequency,

press the

Return

button to return to Sweep

interface after finishing carrier parameter setup, then use the multipurpose knob

and direction buttons to perform the setting, or press

Params→StartFreq

Stop

Freq

to select, then enter in the desired value with numeric keypad, and press the

corresponding MHz to select the desired unit and finish the setup.

•

Start frequency<Stop frequency: the generarator sweeps up in frequency.

•

Start frequency>Stop frequency: the generarator sweeps down in frequency.

•

Start frequency=Stop frequency: the generarator outputs a fixed frequency.

•

Sweep mode synchronization signal is a signal where the period between start to

middle of sweep time is low, and middle to end of sweep time is high.

•

The default start frequency is 1kHz and the stop frequency default is set at 2kHz.

•

Start frequency and stop frequency ranges depend on functions selected and

could be different. See the following table for details.

Содержание 72-3555

Страница 1: ...1 USB Dual Channel Waveform Generator Model 72 3555 ...

Страница 2: ...e Built in Help System 13 Advanced Applications Outputting Modulated Waveforms 15 Setting Modulation Shape Frequency 17 Frequency Modulation FM 19 Setting Modulation Shape Frequency 21 Phase Modulation PM 23 Setting Phase Deviation 25 Amplitude Shift Keying ASK Modulation 28 Frequency Shift Keying FSK Modulation 32 Phase Shift Keying PSK Modulation 35 Pulse Width Modulation PWM 39 Outputting Frequ...

Страница 3: ...the input or output terminals of the product If you deem the product to not be functioning correctly have it checked by qualified maintenance staff Do not operate the product without covers open Do not store or operate the product in a damp or humid environment Do not store or operate the product in a flammable or explosive environment Keep the product surface clean and dry at all times Do not use...

Страница 4: ...nels can be applied simultaneously or independently internal external modulation internal external manual trigger Support frequency sweep and burst output Ease of use multipurpose knob and numeric keypad PRODUCT OVERVIEW 1 USB Port The Generator supports USB flash drive in FAT16 and FAT32 format Through this USB port the Generator can read any saved waveforms from USB flash drive or store current ...

Страница 5: ...between units 9 Manual Trigger Button Manual trigger is enabled when the backlight button flashes 10 Sync Output Connector Synchronises signals to output all standard output functions except DC and noise 11 Multi purpose Knob Button To modify a number or be used as directional buttons Press the multi purpose knob to select functions or confirm the parameter that has been set 12 Direction Buttons S...

Страница 6: ...ctor When using the frequency meter function you can also use the connector to input signal compatible with TTL level signal or output trigger signal when under Sweep or Impulse Train mode When an external trigger source is selected the Trigger Out option on the parameter list will be ensconced since this connector cannot be used for input and output terminals at the same time 3 LAN Connector Conn...

Страница 7: ...rface CH1 and CH2 information When the display is highlighted red for CH1 and blue for CH2 it indicates which channel information is enabled and which channel parameters can be set up Only the highlighted channel can have its parameters changed For the respective channels display there is a Limit icon that represents the output amplitude limit The limit will either be white or grey for on and off ...

Страница 8: ...the Utility menu the sub label options correspond with parameters and are also highlighted around the edges with the same colour as that of the current channel or grey when in the Utility menu Once a sub label has been selected rotating the multipurpose knob or pressing the left and right buttons will cycle through the parameter that correspond to the sub label Use the multipurpose knob if you wan...

Страница 9: ...uency is used if the current frequency value is valid for the new application To modify the waveform period at this moment press the Freq softkey again to toggle between Period and Freq labels Enter the desired number 2 5 using the numeric keypad Select the desired unit Press the softkey that corresponds with the desired unit Once the unit is selected the Generator outputs the waveform with the di...

Страница 10: ...the softkey that corresponds with the desired unit Once the unit is selected the Generator outputs the waveform with the displayed frequency if the output has been enabled In this example press the mVpp softkey Note You can also use the multipurpose knob and direction buttons together to set this parameter SETTING THE SQUARE WAVE The duty cycle of square wave represents the amount of time per cycl...

Страница 11: ...creen to directly enter the number or you can also enter the number 25 and press to complete input To set the falling edge time press the Params softkey again or turn the multipurpose knob clockwise to access the next parameter page and then press the TailEdge softkey and enter the desired value and select the desired unit Note You can also use the multipurpose knob and direction buttons together ...

Страница 12: ...tandard Gaussian noise amplitude to 300mVpp and DC offset to 1V follow the below steps Press Menu Wave Type Noise Params To set the required parameters press the corresponding softkey and then enter the desired value and the desired unit Note You can also use the multipurpose knob and direction buttons together to modify the parameters FREQUENCY MEASUREMENT The Generator can measure the frequency ...

Страница 13: ...esired language or turn the multipurpose knob to select ADVANCED APPLICATIONS OUTPUTTING MODULATED WAVEFORMS Amplitude Modulation AM In amplitude modulation a modulated waveform consists of a carrier and modulation shape The carrier amplitude varies according to the changing amplitude of modulation shape CH1 and CH2 of the Generator can be modulated independently with modulation types applied with...

Страница 14: ... you select internal source the modulation shape can be sine square up ramp down ramp arbitrary noise After AM is enabled the modulation shape defaults at sine To modify this parameter switch on AM interface first and then turn the multipurpose knob or press Params Shape softkey and select the waveform desired Square 50 duty cycle Up ramp 100 symmetry Down ramp 0 symmetry Arbitrary when arbitrary ...

Страница 15: ...nerator will not output one exceeding 5V Peak Peak voltage into 50Ω terminal To modify modulation depth use the multipurpose knob and direction buttons or press Params Depth When you select external source for the modulation the output amplitude is also controlled by 5V signal level presented on the External Analogue Modulation Input Modulation In Connector For instance if modulating depth in the ...

Страница 16: ... the desired value and select the unit as required 3 Setting Carrier Signal Parameters Press CarrierTypeSquare if the Type label is not highlighted press Type softkey again to select the square wave as the carrier signal Use the multipurpose knob and direction buttons to complete the setup You can press Params in the interface above to pop up the display right To set the desired parameter press th...

Страница 17: ...ed the CH1 button will illuminate and the Off icon in grey to the right of CH1 label will change to Mod in yellow indicating CH1 output has been enabled View AM modulated waveform with an oscilloscope right FREQUENCY MODULATION FM In FM the modulated waveform consists of the carrier and modulation shape The carrier frequency varies according to the change of amplitude in the modulation shape CH1 a...

Страница 18: ... desired frequency value and select the desired unit to complete the setting Selecting Modulation Source The Generator offers both internal and external modulation source With FM enabled the modulation source defaults at Internal To modify the parameter switch on the FM interface first then turn the multipurpose knob or press Params Source Ext softkeys to modify Internal Source When you select int...

Страница 19: ...he current carrier frequency Frequency deviation carrier frequency the maximum value allowed with the current carrier frequency If you set the frequency deviation to an invalid value the Generator will automatically limit the deviation to a maximum value allowed with the current carrier frequency Applications Set up the FM mode of the Generator To set a 2kHz square wave from internal source as mod...

Страница 20: ...rresponding softkey then enter the desired value and select the unit as required Setting Carrier Parameters Press Carrier Type Sine to select the sine wave as the carrier signal The default is sine so there is no need to modify Use the multipurpose knob and direction buttons to complete the setup or you can press the Params softkey in the interface to present the display as shown right To set the ...

Страница 21: ...el output enabled the backlight of the CH1 button illuminates and Off in grey to the right of the CH1 label changes to Mod in yellow indicating that CH1 has been enabled View FM modulation shape with an oscilloscope as shown right PHASE MODULATION PM A PM waveform consists of the carrier and modulation shape The carrier phase varies according to the changing amplitude of modulation shape CH1 and C...

Страница 22: ...Internal Source the modulating waveform can be sine square up ramp down ramp arbitrary noise The default is sine Once PM is enabled the modulating shape defaults at sine To modify the parameter switch on PM interface turn the multipurpose knob or press Params Shape softkeys to select Square 50 Duty Cycle UpRamp 100 Symmetry DownRamp 0 Symmetry Arbitrary When arbitrary waveform is selected as the m...

Страница 23: ...lect from 50kHz to 2MHz If the source is chosen externally the modulation shape and modulation frequency options don t show on the parameter list and the carrier is modulated by an external waveform at a frequency from 0Hz to 20kHz SETTING PHASE DEVIATION Phase deviation represents variation of the phase of PM modulated waveform from the carrier phase PM phase deviation can be settable from 0 to 3...

Страница 24: ...the display shown to the right compared with FM PM parameter list doesn t include Phase option To set a desired parameter press the corresponding softkey then enter in the desired value and select the unit as required Setting Phase Deviation When the carrier setup has finished press the Return softkey to return to the interface shown right and then set phase deviation Use the multipurpose knob and...

Страница 25: ... modulation signal controls the output of carrier signal in different amplitude CH1 and CH2 of the Generator can be modulated independently with modulation types applied with the same one or different ones Selecting ASK Press Menu Mod Type ASK to enable ASK function With ASK enabled the Generator will output the modulated waveform at current setting of ASK rate and according to the carrier Selecti...

Страница 26: ...ASK rate to define the rate at which the modulated waveform shifts External Source When you select the External Modulation Source the rate option won t show on the parameter list and the carrier is modulated by an external waveform The ASK output amplitude is controlled by logic level presented on the external digital modulation FSK Trig connector on the rear panel For example when low external lo...

Страница 27: ...Press Carrier Type Sine to select the sine wave as the carrier signal The default selection is a sine wave Use the multipurpose knob and direction buttons to complete the setup or press Params on the interface again and the display will show as seen to the right Setting ASK Rate With the carrier parameter setup finished press the Return softkey to return to the interface right and then set the ASK...

Страница 28: ...y The logic high low level determines the output of the carrier frequency or hop frequency CH1 and CH2 of the Generator can be modulated independently with modulation types applied with the same one or different ones Selecting FSK Press Menu ModType FSK to enable FSK function With FSK enabled the Generator will output the modulated waveform according to the current settings Selecting the Carrier W...

Страница 29: ...xt softkeys to select Internal Source When you select internal modulation source the modulation shape is square wave with a duty cycle of 50 You can change FSK rate to specify the rate at which the modulated waveform shifts between carrier frequency and hop frequency External Source When you select external modulation source the Rate option will not show on the parameter list and the carrier is mo...

Страница 30: ...e Enable FSK function first before modifying FSK rate press Menu Mod Type FSK to enable FSK mode Applications In this example set a sine wave at 2kHz with an amplitude of 1Vpp as the carrier signal and set hop frequency at 800Hz and the rate at 200Hz to shift between carrier frequency and hop frequency Follow the below steps Enabling FSK Press Menu Mod Type FSK to switch on FSK function Setting Ca...

Страница 31: ...buttons to complete the setup or use the Params softkey to open the interface Enabling Channel Output Press the CH1 button on the front panel to switch on CH1 output directly or use the Utility button once the menu opens press the CH1 Setting softkeys to enable output With CH1 output enabled the backlight of the CH1 button illuminates and Off in grey to the right of the CH1 label changes to Mod in...

Страница 32: ... default When PSK is selected press the Carrier softkey to access carrier wave to choose Setting Carrier Frequency Carrier frequency ranges could be different and depend on different carrier waves The default is at 1kHz for all carriers See the following table for details Functions Min Value Max Value Sine 1µHz 25MHz Square 1µHz 5MHz Ramp 1µHz 400kHz Pulse 500µHz 5MHz Arbitrary 1µHz 5MHz To set th...

Страница 33: ...z by default and ranges from 100kHz to 2MHz To change the parameter switch on PSK interface first then use the multipurpose knob and direction buttons or press Params Rate softkeys to finish the setting Setting Modulating Phase Modulating Phase represents the phase variation of the PSK modulated waveform from carrier waveform It ranges from 0 to 360 and defaults to 180 To modify the parameter swit...

Страница 34: ... MHz to return to the interface right Use the multipurpose knob and directional buttons to complete the setup or press Params to reveal the interface shown right To set the desired parameter press the corresponding MHz then enter the desired value and select the unit as required Enabling Channel Output Press the CH1 button on the front panel to switch on CH1 output directly or use the Utility butt...

Страница 35: ...When PWM is selected press Carrier to access the carrier wave selection interface and the Pulse label is automatically chosen Setting Carrier Frequency The frequency of impulse wave ranges from 500μHz to 25MHz and the default value is 1kHz To set the parameter press Carrier MHz to show the corresponding interface then use the multipurpose knob direction buttons to complete the setup or press Param...

Страница 36: ...e modulation shape and modulation frequency items won t show on the parameter list and the carrier is modulated by an external waveform PWM duty cycle deviation is controlled by 5V signal level presented on the external analogue input connector Modulation In on the rear panel For instance if the duty cycle deviation in the parameter list is set to 15 when external modulation signal 5V is applied d...

Страница 37: ...e time Applications Firstly enable PM mode on the Generator In order to set a 1kHz sine wave from the internal generator as modulation signal to use an impulse wave with 2Vpp amplitude at a frequency of 10kHz duty cycle at 50 and rising falling time at 100ns for the carrier and to set the duty cycle deviation at 40 follow the steps below Enabling PWM Function Press Menu Mod Type PWM to enable PWM ...

Страница 38: ...and then set the duty cycle deviation Use the multipurpose knob and direction buttons to complete the setup or press Params DutyDev MHzs then enter in 40 using the numeric keypad and press MHz to finish the setting Enabling Channel Output Press the CH1 button on the front panel to switch on CH1 output directly or press Utility Ch1 Setting to enable the output With CH1 output enabled the backlight ...

Страница 39: ...erator always moves from the start frequency to stop frequency and returns to the start frequency again To set start frequency or stop frequency press the Return button to return to Sweep interface after finishing carrier parameter setup then use the multipurpose knob and direction buttons to perform the setting or press Params StartFreq or Stop Freq to select then enter in the desired value with ...

Страница 40: ...ncy Sweep time defaults at 1s and can be set from 1ms to 500s To modify the parameter enable Sweep interface then use the multipurpose knob and direction buttons to set up or press Params SwpTim to select then enter in the desired value using the numeric keypad and use MHz to choose corresponding unit Selecting Trigger Source The Generator will produce one sweep once it receives a trigger signal a...

Страница 41: ... connector FSK Trig at the start of the sweep When external trigger is selected the Trigger Out option won t show on the parameter list because Trigger Out is executed through the external digital modulation connector FSK Trig which cannot function for both trigger input and output connector at the same time Trigger Edge Even if the external digital modulation connector FSK Trig is used as the Tri...

Страница 42: ...amplitude or press Params to reveal the display shown right To set the desired parameter press the corresponding MHz then enter in the desired value and select the unit as required Setting Start Stop Frequency Sweep Time Trigger Source and Trigger Edge With frequency sweep waveform and its parameters set up press Return MHz to return to the interface right In the interface above right use the mult...

Страница 43: ...ernal manual and external triggers are available to output the train There are three types of impulse trains N Cycle Gated and Infinite The impulse train can be produced with sine square ramp pulse arbitrary except DC or noise applicable for Gated type only waveforms CH1 and CH2 of the Generator can be modulated independently with modulation types applied with the same one or different ones Select...

Страница 44: ...z Square 1µHz 5MHz Ramp 1µHz 400kHz Pulse 500µHz 5MHz Arbitrary 1µHz 5MHz To set waveform frequency select the waveform first then use the multipurpose knob and direction buttons to set up the parameter or press Params Freq MHz and enter in the desired frequency value and select the desired unit to finish the setting Impulse Train Type The Generator can output three types of impulse trains N Cycle...

Страница 45: ...e finished first and then the Generator will stop and remain on the level corresponding to the start phase of the selected waveform For noise waveform when the gated signal goes false the output will stop immediately To modify the polarity access Gated mode interface see above right then use the multipurpose knob and direction buttons or press Params Polarity MHz to complete the setup Infinite Mod...

Страница 46: ...gether or press Params BstPeriod to complete the modification Impulse Train Count In N Cycle mode impulse train count is used to specify the number of waveform cycles It can be set from 1 to 50 000 cycles The default is 1 To modify the parameter set impulse train type to N Cycle first and then use the multipurpose knob and direction buttons or press Params Cycles MHz to complete the setup Cycles B...

Страница 47: ...fied impulse train period When manual triggering is selected the Generator outputs a pulse with pulse width 1µs from external digital modulation connector FSK Trig at the start of burst When external triggering is selected Trigger Out option won t show on the parameter list because Trigger Out is executed through the external digital modulation connector FSK Trig which cannot function as both trig...

Страница 48: ...ipurpose knob and direction buttons to set the amplitude note if there is only frequency options available on the display there is no toggling between frequency and period therefore in order to set the period to 2ms please set the display frequency to 500Hz since they are reciprocal T 1 f Or you can press Params Freq Freq MHz the second press on Freq is to toggle between frequency and period on th...

Страница 49: ...e CH1 button illuminating Also Off in grey to the right of CH1 label will change to Impulse Train in yellow Impulse train waveform with an oscilloscope OUTPUTTING ARBITRARY WAVEFORMS There are up to 48 types of standard waveforms stored in non volatile memory see the table on pages 50 51 Built in Arbitrary Waveforms list for detailed information The Generator can create and edit arbitrary waveform...

Страница 50: ...ally interpolates or points by sampling to output an arbitrary waveform based on a fixed waveform length and the frequency defined on the parameter list Selecting Arbitrary Wave The Generator allows users to output arbitrary waves from internal or external memory To select the desired arbitrary wave enable arbitrary wave function first then use the multipurpose knob and direction buttons or press ...

Страница 51: ...en pressed Make sure power supply is firmly connected to the Generator Make sure the master power switch on the rear panel is in good contact and has been switched to I Restart the Generator No Waveform Output If the settings are correct but there is no waveform output Make sure the BNC cable is properly connected to the channel output connector Make sure CH1 or CH2 button has been pressed Save th...

Страница 52: ... System About DEFAULT SETTINGS Parameters Default Settings Parameters Default Settings Channel Parameters Current carrier Sine Out load 50Ω Sync out CH1 CH1 CH2 output OFF Inverted channel output OFF Output limit OFF Limit high 5V Limit low 5V Basic Waveforms Frequency 1kHz Amplitude 100mVpp DC offset 0mV Start phase 0 Duty cycle of square wave 50 Ramp symmetry 100 Duty cycle of pulse 50 Rising ed...

Страница 53: ...rate 100Hz Hop frequency 10kHz PSK Modulation phase Internal PSK rate 10Hz PSK phase 180 Frequency Sweep Sweep type Linear Start frequency 1kHz Stop frequency 2kHz Sweep time 1s Trigger source Internal Trigger out Off Trigger edge Rise Burst Burst mode N Cycle Start phase 0 Burst period 10ms Burst count 1 Gated polarity Pos Trigger source Internal Trigger out Off Trigger edge Rise System Parameter...

Страница 54: ...pical DC 100kHz 60dBc 100kHz_1MHz 50dBc 1MHz 25MHz 35dBc Total harmonic distortion typical DC 20kHz 1Vpp 0 2 Spurious signal Non harmonic typical DC 1MHz 70dBc 1MHz 5MHz 60dBc 5MHz 25MHz 50dBc Phase noise typical 1kHz offset 105dBc Hz 10kHz offset 115dBc Hz 100kHz offset 125dBc Hz Square Frequency range 1µHz 5MHz Resolution 1µHz Rise fall time 24ns Typical 1kHz 1Vpp Symmetry below 50 Duty Cycle 1 ...

Страница 55: ...olution 1µHz Waveform length 2 8 000 points Vertical resolution 14 bits including sign Sample rate 125MSa s Min rise fall time 35ns typical Jitter RMS typical 15ns 100ppm Non volatile memory 48 waveforms Waveform Output Impedance 50Ω typical Insulation Max 42Vpk to earth Protection Short circuited protection all front BNC output only MODULATION TYPES AM Carrier waveforms Sine Square Ramp Arbitrary...

Страница 56: ...ulating waveforms Square wave 50 duty cycle Modulating frequency 2MHz 100kHz FSK Carrier waveforms Sine Square Ramp Arbitrary Source Internal External Modulating waveforms Square wave 50 duty cycle Modulating frequency 2MHz 100kHz PWM Carrier waveforms Pulse Source Internal External Modulating waveforms Sine Square Ramp Noise Arbitrary Modulating frequency 2MHz 50kHz Pulse width deviation 0 49 99 ...

Страница 57: ...Frequency Meter Input level TTL compatible Input frequency range 100MHz 200MHz Accuracy 51ppm Resolution 6 bit s Coupling DC AC GENERAL SPECIFICATION Display Display type 4 3inch TFT colour LCD Display resolution 480 horizontal x 272 vertical Power Power voltage 100 240V AC 45 440Hz CATII Power consumption 50W 40W Fuse 2A T level 250V Environment Temperature Operating 10 C 40 C Non operating 20 C ...

Страница 58: ...careful not to scratch the LCD protective layer when cleaning the LCD Warning To avoid any short circuit or personal injury occurring from residual water make sure the Generator is totally dry before plugging it in and switching it on INFORMATION ON WASTE DISPOSAL FOR CONSUMERS OF ELECTRICAL ELECTRONIC EQUIPMENT When this product has reached the end of its life it must be treated as Waste Electric...

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