User manual DGS-1
Contents
1. from 5us to 10 seconds e The length of f1 and f2 in external modulation mode can be from 7mks and more e For frequencies above 2 MHz is recommended to use an external filter e Optional generation of DC voltage in the range of 0 1 4 5 V Accuracy of the voltage is 0 1V e Automatic calibration of the output DC voltage when the gain of the amplifier was changed e LCD display for setting and displaying the device parameters e Intuitive menu All settings are saved when the power is turned off e 4 buttons for menu navigation and settings e Lighting controlled by the menu e Power supply from 5V mini USB connector or 5 9 V from an external power source e Dimensions 80x45mm excluding connectors or 110x45mm given the length of connectors http www bravekit com Device map Power supply Connector for external modulation 4 T y A 4 m da 7 2 j E A s 3 R eo DGS 1 At A SELECT button Power supply 5V EXIT PREV NEXT from mini USB button button button http www bravekit com Calibration jumper Potentiometer for gain of amplifier OA DDS jumper Power supply Power supply can be connected in two ways e Power supply 5V from mini USB connector X3 Just connect mini USB cable from any USB port to DGS 1 and device now is powered up e Power supply from external 5 9V power supply unit which must be connected to black connector X4 This power input protected against reverse polarity of t2. output voltage which allows for the current gain of the built in amplifier To view these limits of the voltage settings go to Settings Uout Uinfo menu In the future if you set the output voltage which exceed this limits the device is not allowed to set this voltage For running device in voltage generation mode you must Information about version of hardware and software To check the version of the board HW and version of firmware SW go to the menu Info in the root menu Go to Settings Uout U setup menu Set desired value of voltage which in range Umin Umax Press EXIT In this case the selected value is stored in non volatile memory and will be restored automatically when you turn on the power If at the moment the device was in generation state in mode Voltage the selected voltage is established immediately at the output of device If the selected voltage is outside the range Umin Umax see menu Settings Uout U Info you will see message that U lt Umin if set voltage less than the lower limit or U gt Umax when the set voltage is greater than the upper limit Then the device automatically returns to the U setup menu Go to Stopped menu item and press SELECT button Text of this menu item should be changed to RUN thereby indicating that the device in generating state Voltage set value can be changed in a state of generation it is will be instantaneously establ
3. the device automatically returns to the f1 duration menu Similarly for the t2 duration do same steps For running DGS 1 in Auto FSK mode you must Set f1 and f2 frequencies Set t1 and t2 duration Set desired form of signal sinusoidal square or rectangular in menu Form Select AutoMod menu item in menu Mode Go to Stopped menu item and press SELECT button Text of this menu item should be changed to RUN thereby indicating that the device in generating state You can change any parameters f1 f2 t1 t2 and form during DGS 1 in generation state Any change will be immediately applied to the generated signal http www bravekit com Examples of generated signal in Auto FSK mode CH1 1 00 500 0us RIGOL 500 0us CH1 1 00 500 0us http www bravekit com Sinusoidal signal in Auto FSK mode f1 1kHz t1 3000us f2 5kHz t2 1500us Square signal in Auto FSK mode f1 1kHz t1 3000us f2 5kHz t2 1500us Triangular signal in Auto FSK mode f1 1kHz t1 3000us f2 5kHz t2 1500us External FSK modulation mode generating of FSK modulated signal which controlled from external input This mode is designed to generate an FSK modulated signal the frequency that corresponds to the values of the frequencies f1 and f2 and the duration of the each frequency corresponding to the states of the external modulation input MOD When the input MOD present logic 1 or
4. Signal generator DGS 1 2 o Aw b gt Tan a gt K gt e gt gt a i A Ki 8 E Lee Va eg A e e b gt VIN Ae t Se jo 2 lt Ki User manual Introduction VEO CIC COIN ME 2 SET 2 Device maD WE 3 Power ee EE 4 DS HERE 4 DESCRIPTION OF MENU eiert EE 5 VE ele e E 5 Displays the current Settings of the device 6 C nirotand UE ONS coc cine coseence asp tented aea aeS ANEO EEEE EPERE EERE ERER ERS 7 Te Ar 7 DESIGN 8 Usual mode generating signal with f1 frequency without FSK modulation 8 Auto FSK mode generating of FSK modulated signal with internal modulation 50 66 9 External FSK modulation mode generating of FSK modulated signal which controlled from external Ipput 11 Voltage mode generating DC voltage cox seesssnuasosseacuswisivinsisn snes duswia enavasiodsied sweat svinssivaeevatcuseawvavedubteleandadaesande etcudenweieneavieieuncyee 12 VOUS tee BE 12 Information about version of hardware and software 12 http www brav
5. cture To help you navigate through the menu before each menu item is automatically displayed signs of hierarchy e The symbol ai indicates that the menu does not contain a sub menu and press the SELECT button will activate this menu change its state or to set the numerical values of this parameter depending on the menu e The symbol gt indicates that the menu item has a submenu which you can access by pressing the SELECT button If the DGS 1 is in generation state the Stopped RUN menu parameter is RUN then when you change a menu setting the signal changes instantaneously in accordance with the specified parameters If the device is in the Stopped state the changed parameter will be applied when next starting Menu options e Stopped RUN start or stop signal generation with the parameters set in the other menu items e Settings o f1 main input value of the main frequency f1 o 2 FSK input value of the FSK frequency f2 used for FSK modulation o f1 duration input value of duration for f1 in auto FSK modulation mod o f2 duration input value of duration for f2 in auto FSK modulation o Uout U setup input value of DC voltage generated in Voltage generation mode U info information about min and max DC voltage which can be generated with set gain of operational amplifier Calibration calibration of DC voltage e Form O Sinus generation of signal with sinusoidal form O Square generati
6. ed signal which controlled from external input If the input logic 1 is present at modulation input or no control signal is present at this input the output signal is present at a frequency f1 If the input logic O is present at modulation input the output signal is present at a frequency f2 o U x xxV where x xx any voltage for example U 3 25V This informs that in the current settings is selected generate a constant voltage level corresponds displayed on the screen To exit from the state of display options and automatic entry in the menu press In this example showed state of any button on the instrument board You stopped generation After starting will be generated square signal with f1 will be automatically moved to the frequency device menu Subsequent presses buttons will navigate through the menu as usual In this example DGS 1 is in generation state It is do generate sinusoidal signal with FSK modulation http www bravekit com Control and buttons DGS 1 controlled by using the four buttons SELECT selection NEXT next PREV previous and EXIT out back SELECT button used for e Entry into the current directory menu if on LCD is showed the gt icon before the current menu item e Select the current menu item as active if on LCD is showed the icon before the current menu item e Changing of the current digit when setting the frequency duration or value of the output v
7. ekit com Introduction The signal generator DGS 1 is designed to generate signals of sine square and triangular waves with different frequencies and to generate DC voltage in the range of 0 1 4 5V In DGS 1 is based on AD9833 DDS direct digital synthesis chip and has a user friendly interface controls and compact size Features e Signal generation of sine triangle or square wave in the frequency range 0 12 5 MHz according to the documentation for DDS with a step of 1 Hz frequency e Stability 100ppm e Built in amplifier e The ability to select the source directly or through an amplifier DDS e peak to peak voltage of signal which generated from the output of DDS is 0 038 0 65V e Peak to peak voltage of sinusoidal or triangular signal from the amplifier output is 0 1V 4 6V The upper peak of the generated signal can be reduced by adjusting the gain of the operational amplifier by adjusting potentiometer e voltage amplitude of the square wave signal from output of amplifier is 0 1 to 4 6B and does not depend from the gain of the amplifier e Generation of FSK signals FSK binary modulation without breaking phase Modulation can be performed by the internal modulation source automatic modulation duration of f1 and f2 is determined by parameters set by the user from the menu and by external logic signal external modulation with the voltage level no more than 5V e The length of f1 and f2 in the automatic modulation can be
8. em should be changed to RUN thereby indicating that the device in generating state 20 00us Sinusoidal signal in usual mode f1 10kHz Square signal in usual mode f1 10kHz Triangular signal in usual mode f1 10kHz http www bravekit com Auto FSK mode generating of FSK modulated signal with internal modulation source This mode is for generating FSK modulated signal with frequencies f1 and f2 Duration of each signal selected in f1 duration and f1 duration menu parameters The transition from one frequency to another occurs without breaking phase For set duration of signal you must Go to Settings f1 duration menu item using the NEXT and PREV buttons move the cursor to the desired digit current cursor position is shown underlined then pressing the SELECT select the desired numerical value of the discharge after each pressing the SELECT this digit will increase by 1 after the number 9 he was again reset to 0 Once you have set the desired frequency press the button EXIT In this case the duration t1 is stored in non volatile memory and will be automatically restored when you turn on the power If the device was in generation state in mode AutoMod the selected duration will be immediately applied to generated signal The duration value should not be less than 5us Otherwise when you press the button EXIT the message about exceeding the allowable limit will be shown then
9. f1 main using the NEXT and PREV buttons move the cursor to the desired digit current cursor position is shown underlined then pressing the SELECT select the desired numerical value of the discharge after each pressing the SELECT this digit will increase by 1 after the number 9 he was again reset to 0 Once you have set the desired frequency press the button EXIT In this case the selection of frequency f1 is stored in non volatile memory and will be automatically restored when you turn on the power If the device was in generation state in the modes Normal AutoMod or ExtMod selected frequency f1 will be immediately applied to generated signal The selected frequency shall not exceed value 12500000 Hz Otherwise when you press the button EXIT the message about exceeding the allowable frequencies will be showed then the device automatically returns to the input frequency menu For start generating signal in usual mode you must Set desired value of frequency f1 In menu Form to select the desired waveform sine square or triangle To select the desired form you must go to menu item press the button SELECT In this case near the selected menu item appears sign see the section Backlight In Mode menu go to Usual menu item and press SELECT button Near the selected menu item appears sign Go to Stopped menu item and press SELECT button Text of this menu it
10. he applied voltage X4 PWR VIN 3 See Sek IN OUT AM i GND OUT 0 1 REG1117 5 0 GND_D IN OUT GND OUT REG1117 3 3 Power supply schematic Signal output The device DGS 1 has a built in amplifier to operate over the full frequency range of the generated signal However a situation may arise when the parameters of the amplifier will not be sufficient In this case use an external amplifier and a signal to take directly from the output of DDS The device DGS 1 provides such an opportunity with a jumper OA DDS Position DDS connects the output signal from the DDS directly to the output connector The voltage peak to peak signal is generated 0 038 0 65V Attention Connecting directly to the DDS output low impedance load lt 1kOhm can lead to failure of the device Selecting built in amplifier with OA jumper DDS output connecting directly to output of position DGS 1 with DDS jumper position At the OA position signal arrives to the output connector through the operational amplifier Gain of operational amplifier is adjustable by the potentiometer In this case the peak voltage of generated sinusoidal or triangular signal from the amplifier output can be up to 4 6 V Voltage peak to peak square wave is 0 1 to 4 6V and does not depend on the gain of the operational amplifier http www bravekit com Description of MENU The menu displayed on the LCD display and has an intuitive hierarchical stru
11. ished at the device output http www bravekit com 12
12. oltage NEXT button used for e Moving to next menu item PREV button used for e Moving to previous menu item EXIT button used for e Exit from current menu item to parent menu item e Exit from menu of set digits for f1 f2 t1 t2 or voltage value In this case when you press the EXIT button this parameter will be saved in non volatile memory device and this parameter will be applied to the generated signal application occurs on the fly when the device is in a state of generation Backlight LCD display of DGS 1 have backlight For enabling backlight you must e Go to menu item Light e press SELECT button e Now backlight is used Near Light menu item must occur symbol which indicate that this parameter is active e For disabling backlight press SELECT button on Light menu item again The status Backlight is stored in non volatile memory and will be automatically applied when you turn on the power http www bravekit com Description of modes DGS 1 can operate in several modes each of which can be selected in the menu Mode Usual mode generating signal with f1 frequency without FSK modulation This mode is for generating a signal frequency f1 Set the frequency in the range of 0 12 5MHz with 1 Hz step The set value is stored in non volatile memory and will be restored automatically when you turn on the power For set frequency value you must Go to Settings
13. on of signal with square form o Triang generation of signal with triangular form o Usual generation of signal with f1 frequency without FSK modulation o AutoMd FSK signal generation with the parameters set by the user o ExtMod generating FSK signal controlled by an external logic signal or relay o Voltg generation of DC voltage in range 0 1 4 5V e Light backlight on off e Info information about version of hardware and software http www bravekit com Displays the current settings of the device If the user does not press any of the buttons for more than 10 seconds the device switches to display its current state except for the situation where an active menu for input digits of frequency f1 and f2 f1 duration or f2 or enter the value of the DC voltage In this case the screen displays e Atthe left side of upper row information about status of signal generating o RUN Signal is generated o Stop generation stopped e At heleft side of upper row information about form of signal o SIN sinusoidal signal o N_A square signal o AAA triangular signal o U DC voltage generated e At the bottom row information about mode o Gener f1 generation of signal with f1 frequency without FSK modulation o AutoMod generation of FSK modulated signal with f1 and f2 frequencies duration for 11 and f2 set in f1 duration and f2 duration o ExtMod generation of FSK modulat
14. signal not present DGS 1 generate f1 frequency When the input MOD present logical O or the input is connected directly to ground unit second contact of MOD connector DGS 1 generate signal with a frequency f2 The transition from one frequency to another occurs without breaking phase Control on MOD input can be performed by any control device that generates pulses and from the relay The voltage level of the logic 1 at the input MOD should be 2 5 5 1V The voltage level of logic O at the input MOD should be 0 0 2V The delay between the edge of the control signal at the MOD input and changing the frequency at the output is 7us For running device in External modulation mode you must e Set f1 and f2 frequencies e Select signal form in menu Form Sinusoidal Square or Triangular e Inmenu Mode select ExtWMod menu item e Goto Stopped menu item and press SELECT button Text of this menu item should be changed to RUN thereby indicating that the device in generating state e lt Any from parameters f1 f2 and form can be changed during generation state of device Any change will be immediately applied to the generated signal e Frequency of generated signal e frequency of the generated signal is changed from f1 to f2 and vice versa depending on the input state MOD HI 1 DOUM d 2 00 1 000us 7 Sinusoidal signal in mode External modulation Delay be
15. tween the edge of the control signal at the MOD input f1 1kHz f2 10kHz and changing the frequency at the output 7us Sinusoidal signal in mode External modulation f1 1kHz f2 100kHz Graph N21 yellow this is generated signal Graph N22 blue this is signal at MOD input http www bravekit com 11 Voltage mode generating DC voltage This mode is used to generate a DC voltage in the range of 0 1 4 5 V Generation function is implemented on the basis of the DAC module of DDS chip so the accuracy of output voltage is not better than 0 1 V Function of voltage generation only works with built in amplifier jumper OA DDS must be set to OA Voltage calibration The accuracy of the generated voltage depends largely on the stability of the gain built in amplifier If the gain is changed after adjustment potentiometer to recover the accuracy of output voltage should be recalibrated For calibration you must Install Calbr jumper it is located under signal output connector Set OA jumper Disconnect cable from signal output Go to Settings Uout Calibr menu item and press SELECT This will start the automatic calibration of output voltage After the end of the calibration process you will see message Calibration ended and the device will automatically switch to the menu Uout During the process of calibration automatically calculated upper and lower limits of the
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