Protek Oscillator B8000FD
Contents
1. Protek Test and Measurement B8000FD Series DDS Function Generator Operators Manual Functor Generator Contents 1 WATFOCUIGTION enner as 1 a DEE 1 1 2 DDS Ee ele e VE 1 13 Product SOMES int oi ea 2 14 General Information TAA COMMS unid 2 VA 2 EE 2 2 Unit GESCIDUON WEE 3 2 0 EECH cn aii 3 2 1 Front Panel e te EE 3 2 2 REAL EECHER tee ege ed 4 2 3 FRONT DANE CONTO EE 5 2 4 Front panel button descrnpton 6 3 Using the front panel buttons eee eee ees 8 O T auras 8 32 e e EE 9 SS AMP rre ia 10 324 DUV e EE 12 A Eege 12 3 6 Mode DUNO dada da ager 13 4 Modulation setup menus Kee 15 AA Emea EE ege sites dee 15 4 2 LOJ SWEEP iia 16 4 3 Frequency Shift Key case ntc aces meee 17 4a Phase SHULKCY origina ia 17 4 5 Amplitude shift Key colision iria 17 46 BUS E WEE 18 BT O rule ee openness 18 4 8 Phase ee EE ue EE 19 4 9 Internal Am modulation eannnnnunnannenunnernnrrnrenuu 19 4 10 External AM modulaton 19 ANDE MO tica 20 5 Multifunction menu 21 Sl SONO DUO iii 21 02 BOUT nit See 21 5 3 Frequency Counter 22 SAROZ oe 23 6 External E En 24 6 1 Ree ere id sis 24 6 2 Single MO cional 25 0 9 KEE EE 25 e BEE 26 Appendix technical Specifications oooooooocoo o 27 1 Introduction 1 1 Introduction The B8000FD series Digital Synthesized Function generator have the following features DDS technology for excellent frequency stability2. frequency resolution and the ability to generate very low frequencies Very precise Sine Square triangle Ramp Exponential Pulse and Sin X X waveforms are generated using the key board or encoder dial entry FSK ASK PSK Burst modulation Low 54dBC Sine wave distortion Log and linear sweeps Internal and External AM and FM modulation Dual independent channel outputs Built with integrated circuits for high reliability and small size Dual back lit LCD display increases the number of displayed parameters Built in 100MHz frequency counter RS 232 interface for connecting to a PC 1 2 DDS Technology DDS is the abbreviation for Direct Digital Synthesis It completely changes the way waveforms are generated With the use of High speed digital circuits memories and D A converters a wide range of highly stable accurate and complex waveforms may be generated 1 3 Product series There are four models to choose from in the B8000FD series of DDS function generators with frequency ranges from 1uHz to 40MHz These models include All models are easy to use and generate Sine Square Triangle Ramp Exponential up Exponential down Pulse sin x x and noise waveforms They also provide a wide variety of modulations including Burst Frequency shift key Phase shift key amplitude shift key Am FM PM along with Linear and Log sweep All modulation and waveform parameter values are entered in to user friendly menu
3. when the Freq Amp Duty or Offset menu is displayed The value at the top of the LCD will have a digit blinking Pressing this key to the left al will cause the digit to the left to blink Pressing this key to the right gt will cause the digit to the right to blink 3 Using the Front Panel buttons 3 1 Waveforms Wavef Pressing the Wavef button displays the waveform menu as shown in Fig 3 This menu displays the waveform to be changed in blinking characters at the top of the LCD The lower portion of the LCD displays the parameters of the currently selected waveform frequency and amplitude The blinking waveform can be changed by rotating the Encoder knob Rotating this knob will step through all 10 waveforms Note Only the Sine wave can be set to the upper frequency limit of the generator and is determined by the model number The square wave upper limit is 5MHz except the B8003FD 8 which is 3MHz All other waveforms have a upper frequency limit of 1MHz Exceeding these limits will cause the waveform to be distorted WAVEFORM sin Sin 1 0000 kHz 1 00V Fig 3 3 2 Frequency Freq Pressing the Freq button displays the frequency menu similar to what is shown in Fig 4 The top portion of the LCD displays the Frequency value to be changed with a digit blinking along with its frequency units The new frequency value is entered here The lower portion of the LCD displays the currently selected waveform
4. ASK or BURST waveform The length of the waveform is set by the time duration of tw the parameter The ts time duration is invalid in single trigger Note1 when using FSK in the single trigger mode the output frequency will be continuous at the value the F2 frequency is set to When the Trig is pressed the generator will output the F1 frequency value for the duration of the tw time then will return to the continuous output at the f2 frequency Note 2 When using PSK in the single trigger mode the generator will output continuously the fo frequency value When the Trig button is pressed the fo phase will change to the value that is set in ph and will continue for the duration set by the ts value then return back to the original fo phase value When in single trigger the generator outputs a TTL level pulse though the SYN output when the Trig button is pressed which can be used to trigger an oscilloscope Single trigger mode requires that there is no signal input through BNC otherwise they can interfere which each other 6 3 External trigger When the generator is in the single trigger mode the External trigger input is also enabled When the rising edge of the external ttl pulse is applied to this input can trigger the waveform at the rate of the external trigger signal as long as the frequency of the trigger signal is longer than the modulation s 25 ts width duration To exit
5. Pressing the lt amp to the left will cause the digit to the _ left to blink and can be changed using the procedure in the above paragraph Pressing the a amp gt to the Amplitude position will cause the currently selected amplitude units to blink The amplitude units are millivolts and volts Rotating the Encoder knob clockwise while the amplitude unit is blinking will cause the amplitude to increase by a factor of 10 Rotating the Encoder knob counter clockwise will decrease the amplitude by a factor of 10 Example If the currently selected amplitude is 100 mV and the mV unit is blinking rotating the encoder clockwise 1 step will increase the amplitude by a factor of 10 to 1 00 volts Rotating the Encoder knob counter clockwise 1 step will decrease the amplitude by a factor of 10 to 10 0mV The keyboard can also be used to enter an amplitude value Entering a digit from the keyboard will clear the current value and all digits being entered will blink and then press the Enter 11 button If the value entered from the keyboard is wrong and the digits are blinking pressing the Esc key will return the amplitude value to its previous value AMPLITUDE mV Sin 1 0000 kHz 100mV Fig 5 3 4 Duty ratio Duty Pressing Duty button displays the Pulse Duty ratio menu on the LCD as shown in figure 6 The top portion of the LCD displays the Duty ratio value with a digit blinking along with a symbol The new Duty rati
6. decimal point may be entered from the Key board and all the entered digits will be blinking Pressing the Enter key confirms the new value and the blinking will stop NOTE Pressing the ESC button at any time while the digits are being entered blinking will cause the frequency to revert back to its previous value If the frequency value entered from the keyboard or encoder know is greater than the upper frequency limit of the selected waveform the frequency value will default to the upper frequency limit of the selected waveform See the specifications for this unit Fo 1 000000 KHz Sin 1 0000 kHz 1 00V Fig 4 3 3 Amplitude Amp Pressing the Amp Button displays the amplitude menu similar to what is shown in Fig 5 The top portion of the LCD displays 10 the amplitude value with a digit blinking along with the amplitude units The new amplitude value will be entered here Note The displayed amplitude is in volts peak to peak in to a 900 load with an amplitude range of 1 00mV to 10 0 Volts for the models with frequencies of 20 MHz or less 1 00mV to 3 00V for the model B8040FD The lower portion of the LCD displays the currently selected waveform along with its frequency and amplitude value Pressing the a amp gt button to the right will cause the digit to the right to blink To change this digit rotate the Encoder knob clockwise to increment the digit or rotate the Encoder know counter clock wise to decrement it
7. rotated counter clockwise the blinking will decrease 3 The Soft buttons are for selecting the menu items when the Mode or Config Menus are displayed The Soft buttons are assigned to corresponding parameters Example When the MODE key is pressed the Mode selection menu is displayed on the LCDO as shown in Figure 2 In this S example continuous CW which is displayed adjacent to mode is the currently selected item Pressing the soft button corresponding to gt displays the next group of modulations 4 The front panel keys are of 3 types The first is the single function buttons that displays waveform frequency amplitude DC offset and duty ratio values when pressed The Soft buttons are not used within these buttons 5 The second type are the keys that display more than one menu item on the LCD when pressed The Mode and Config keys are examples These Soft buttons are used to select items when multiple menu items are displayed 6 The third type are execution buttons The Enter key enters waveform parameter values the Esc key cancels an input value after entering it from the key board The direction key lt 8 gt navigates through the displayed numerical value on the LCD and the Trig key for performing single cycle and external trigger waveform operations 2 4 Front panel button description e Mode When pressed displayes the modulation option menus 6 Config This key when pressed s
8. signals of the same frequency but have different phases is needed for an application 20 5 Multifunction menu 5 1 Config button Pressing the Config button displays Multi funct menu as shown in Fig 24 When this key is pressed the LCD displays the items that may be selected These items are CH2 B OUT frequency counter fin and RS232 Pressing the corresponding soft button displays the setup menu for the selected item The procedure to select menu items and parameters are the same as explained in the above paragraph on Mode button MULTIFUNC MENU 5 2 B OUT CHANNEL2 SETUP off wave fa ampl OK Fig 25 Off Turns the B OUT On or Off Wave selects the Waveform Fa selects the Frequency Ampl selects the Amplitude OK Confirm the new setup and starts the B OUT The B OUT is an auxiliary low frequency DDS function generator capable of outputting all waveforms as described 21 above and can be used as the modulation generator for the Ext AM mode Note The B OUT can not be used simultaneously with the main output if the main output is in an internal modulation mode If the B OUT is selected and then a modulation mode is selected for the main output the B OUT will shut off and the message CH 2 off will appear briefly on the LCD If the main output of the generator is in an internal modulation mode and then the B OUT channel is selected the modulation will turn off and the generator will go in to
9. the Continuous CW mode and the modulation off message will briefly appear on the LCD 5 3 Frequency counter FREQin lt 100MHz Fig 26 Pressing the soft button corresponding to 100MHz will toggle the counter between the 1Hz to 100 KHz range and the 100 KHz to 100MHz range The input signal is applied to the counter BNC connector located on the rear panel Quit Exits the Frequency counter mode Note When the frequency of input signal is less than 100kHz it is suggested using the 1Hz to 100kHz frequency range for better stability When the frequency of the input signal is greater than 100 kHz use the 100KHz t6100MHz range to prevent errors 22 5 4 RS 232 RS 232 9600 N 8 1 quit Fig 27 RS 232 9600 N 8 1 9600 Baud rate no parity bit 8 bit data 1 bit stop Quit Disables RS 232 and exits the menu Users can utilize the instrument s instruction set to communicate with the PC and remote control the instrument The Instruction set are character strings of up to 15 Characters Each string controls a specific function or parameter of the function generator Fig 28 lists the character string and the function or parameter controlled WAVE SIN output sine wave WAVE SQUARE output square wave WAVE TRIANGLE output triangle wave WAVE RAMPUP output rising ramp wave WAVE RAMPDOWN output falling ramp wave WAVE NOISE output noise WAVE SINX X output SIN x x WAVE EXPUP output exponential up W
10. the trigger mode press the Esc button The trig symbol will disappear in a non modulation mode or the T in a modulation mode and the instrument will return to the internal trigger mode 7 Store Recall B8040FD STORE RECALL Memory l Fig 29 The Store function saves all current parameters and modes while the Recall function recalls and get back to the saved parameters and modes Parameters and modes like waveforms frequency amplitude duty ratio DC off set modulation B OUT etc can be saved or recalled all at one time When recall the saved settings the instrument applies the saved settings Adjust the encoder dial to select the memory unit position from 1 to 20 all together 20 memory units 5 1 How to store Pressing the Store button displays the store menu as shown in Fig 30 with the 1 blinking STORE Memory Fig 30 26 Use the encoder dial to select memory location from 1 to 20 Press Store button to save the current waveform parameter settings to the selected memory location If the current memory unit already has stored data a message memory full overwrite will appear on the LCD To overwrite press the Store button again otherwise press the Esc button and enter a different memory Number 5 2 How to recall Pressing Recall button displays the menu as shown in Fig 31 with the 1 blinking RECALL Memory Fig 31 Use the encoder dial to sele
11. AVE EXPDOWN output exponential down FREQ1000 Sets the frequency to 1000Hz The range IS from 0 001 to15 000 000 VOLT100 Sets the amplitude to 100mV the range is 1mV to 10 000mV 23 DUTY50 Sets the pulse ratio to 50 duty ratio The duty ratio range is 20 to 80 OFFSETO Set the DC of set offset to 0 The DC offset range is 100 to 100 Fig 28 Each instruction must not exceed 15 characters Every instruction must end with or with a return character to indicate that the instruction set is sent out The ASCII code of a new line character is 10 but it is indicated by n in C language If there is no ending character in the instruction set the instrument may lock up and be restarted There should be sufficient time between two instruction so as to allow enough time for the instrument to finish the current operation 6 External Trigger 6 1 Trigger Button When in the SWEEP FSK ASK and BURST modes it may be at times desirable to execute one cycle at a time The B8000FD series of DDS generators have single cycle and external trigger capability Pressing Trig key once the instrument enters into triggered mode The LCD will display trig on the bottom right side of the LCD If the MODE key has been pressed the word MODE will change to MODE T 24 6 2 Single trigger When in the signal trigger mode every time the Trig button is pressed the generator will output one SWEEP FSK PSK
12. along with its frequency and amplitude value Pressing the a 8 gt key to the right will cause the digit to the right to blink Rotating the Encoder knob clockwise will increment the blinking digit Rotating the Encoder knob counter clockwise will decrement the Digit Pressing the lt 2 gt button to the left will cause the digit to the left to blink To change the value of the blinking digit use the same procedures as explained in the above paragraph Pressing the a amp gt button to the Frequency units position will cause the currently selected frequency units to blink There are 5 frequency units to choose from millihertz mHz Hertz Hz Kilohertz KHz and Megahertz MHz Rotating the Encoder knob will step through the frequency units Rotating the Encoder knob clockwise while the frequency unit is 9 blinking will cause the frequency to increase by a factor of 10 Rotating the Encoder knob counter clockwise will decrease the frequency by a factor of 10 Example If the currently selected frequency is 1 0000000 KHz and the KHz units is blinking rotating the encoder clockwise 1 step will increase the frequency to 10 000000 KHz Rotating the Encoder knob counter clockwise 1 step will decrease the frequency to 100 00000 HZ A frequency value may also be entered using the keyboard Pressing a number on the key board will enter the keyboard value the previous digits will be cleared and it will blink An 8 digit value plus
13. ct a memory location from 1 to 20 Press Recall button again to recall the stored data The generator will be set to the parameters that are stored in the selected memory location If there is no stored data in the current memory unit a message ERROR memory empty will appear on the LCD briefly Then the instrument will automatically return to the recall menu A different memory location should be selected 27 Appendix Technical specifications SINE SQUARE TRIANGLE RAMPUP RAMPDOWN NOISE SIN X X EXPUP EXPDOWN PULSE Function Waveform 1 u Hz to the upper limit 1u Hz to SMHz Other waveforms 1u Hz to 1MHz Maximum resolution 0 14 Hz or 8 digits Long term stability 50ppm 0 C to 40 C Characteristicienort term stability 1ppm after 20 minutes of warm up Precision 0 4Hz gt 3 1KHz 0 114 Hz lt 100mHz Sine lt 20kHz 0 2 54dBc harmonic 20kHz to 1MHz 0 4 48dBc distortion 1MHz to 10MHz 1 40dBc 50 load 10MHz to 20MHz 2 9 22dBc 1Vpp output Frequency Square wave 50 load 1Vpp output Rise and fall times lt 15ns Overshoot lt 5 Signal Non linearity 1 20ns Pulse wave Characteristic Duty ratio 0 1 to 99 9 lt 10kHz 1 to 99 lt 100kHz 3 to 97 28 riangle wave amp ramp wave Linearity 1kHz lt 0 1 Amplitude into an open circuit 2mVpp to 6Vpp B8040FD 2mVpp to 20mVpp All other units in to 50 1mVpp to 3Vpp B8040FD OUTPUT 1mV
14. e first frequency and low during the time the signal switches to the second frequency TS PSK the sync signal is high during the time the PSK signal is at Zero phase TW and low during the time the signal switches to the Phase shifted signal TS ASK the sync signal is high during the time the ASK signal is active TW and low during the time it is inactive TS waiting the next cycle to start B OUT Second output with an impedance of 6002 All waveforms with a frequency to 20 KHz maybe selected This output signal may be used as the modulating signal when using External AM 2 2 Rear Panel Inputs 11 12 13 14 15 16 External Trigger input see fig 1A External Frequency counter input Ext AM input AC line Voltage selector AC input RS232 connector w ee ee ee wee NVARNING Dee 12 13 14 15 16 Fig 1A Rear Panel 2 3 Front Panel controls The front panel controls consists of 1 The Numeric keyboard which is used to enter waveform data Frequency amplitude offset and Duty cycle and the various modulation parameters as will be explained later 2 The encoder knob is a Rotary digital encoder used to set values for the selected waveform parameter such as amplitude phase frequency etc When a parameter is selected a digit in the value will blink Rotating the encoder will change the value When this knob is rotated clockwise the blinking digit will increase and when
15. elects the B OUT put Frequency Counter and RS232 menus Trig When Burst ASK PSK or FSK modulation has been selected see chapter on the Trigger functions pressing the Trig key the generator enters the Single trigger mode Pressing the Trig key again the generator will output one waveform The External trigger input is also enabled A signal applied to the External trigger input will externally trigger the generator at the rate of the External input signal Enter Enters and stores the numeric data which has been entered from the Key board or the rotary dial Esc cancels the current keyboard or rotary dial data operation and displays the data that was previously entered If the triggered operation was previously selected pressing this key will return the unit to normal operation Keyboard buttons enters data values in to the upper portion of the display of the selected waveform parameter Pressing the ENTER key enters the new data If the data entered is incorrect pressing the ESC key will return the display to the previous value e Soft buttons These keys are located at the bottom of the LCD display and are used to select in items in the Mode or Config menus The five buttons are have a corresponding menu item assigned to them item and selects this item when pressed See fig 2 o lt 4 amp gt direction button This key is a bi direction key used to navigate through the waveform data digits
16. o FSK displays the menu as shown in figure 15 MODE FSK fl f2 tw ts OK Fig 15 F1 frequency 1 F2 frequency 2 Tw the working time of frequency 1 Ts the working time of frequency 2 OK Confirms the settings and starts the waveform 4 4 Phase shift keying Fig 16 Fo Carrier frequency Ph phase difference Tw the 0 phase shifted signal working time Ts the phase shifted signal working time OK Confirms the settings and starts the waveform 4 5 Amplitude shifting keying Fig 17 Fo Carrier frequency 17 Ph Carrier phase shift Tw Carrier frequency duration Ts the time the next waveform starts OK Confirms the settings and starts the waveform 4 6 Burst Pulse waveform BURST ph co ts OK Fig 18 Fo Burst waveform frequency Ph the burst starting phase Co Number of cycles in the burst Ts the time the next burst starts OK Confirms the settings and starts the burst 4 7 FM MODE internal FM fo fm fd wa OK Fig 19 Fo Carrier wave frequency Fm Modulating wave frequency modulation Fd Max frequency deviation deviation Wa Modulating waveform wave Ok Confirms the settings and starts the waveform 4 8 Phase modulation MODE internal PM fo fm pd wa OK Fig 20 Fo Carrier wave frequency Fm Modulating wave frequency modulation Pd Max phase deviation deviation Wa Modulating waveform wave OK Confirms the settings and start
17. o value is entered here Note The Duty ratio is only valid with a Pulse or pulse modulated waveform Duty ratio values of 0 1 to 99 9 may be entered using Encoder knob or the keyboard as explained in the paragraphs on Frequency and Amplitude Percent is the only unit for duty ratio Pulse Duty 10 0 puls 1 0000 kHz 100mV Fig 6 3 5 Offset Pressing Offset button displays the Voltage Offset menu on the LCD as shown in figure 7 The top portion of the LCD displays the offset value with a digit blinking along with a symbol The new Duty ratio value is entered here The Offset value may be entered using the encoder dial or the keyboard as 12 explained in the paragraphs on Frequency and Amplitude An offset may be added 100 to 100 of the waveform value DC OFFSET 0 sin 1 0000 kHz 100mV Fig 7 3 6 Mode Button Pressing the Mode button displays the modulation selection menu as shown in Fig 8 The first line on LCD displays the current modulation and in this case Continuous wave no modulation is selected and is also the default modulation The second line displays the modulations that may be selected with a corresponding soft button The soft button when pressed the first time displays the selected modulation on the top line pressing it again displays the modulation setup menu Continuous Lin Log The modulations that can be selected in figure 8 are Linear Sweep Lin Log sweep Log F
18. p starts OK Confirms the settings and starts the sweep Pressing the soft button that corresponds to F1 the Start frequency will be displayed on the top line of the menu as shown in Fig 13 The start frequency and all other parameters are set and entered using the Encoder dial and the keyboard as explained on page 9 and page 11 on how to set the generator frequency and amplitude Press the Enter button after the F1 frequency is entered 19 F1 1 0000000 kHz fl f2 tw ts OK Fig 13 When all parameters are entered press the soft button corresponding to OK to start the linear sweep Note If F1 frequency is greater than F2 the sweep will start at the frequency entered by F1 and stop at the frequency entered by F2 If F2 is less than F1 the sweep will start at the frequency enter at F2 and stop at the Frequency entered at F1 The range of the start and stop frequencies that can be set is from 1Hz to the maximum frequency of the generator 4 2 Log sweep Note The same parameters procedures and conditions as was explained in linear sweep apply for Log sweep Pressing the soft button corresponding to the Log sweep displays the menu as shown in Fig 14 MODE log sweep fl f2 tw ts OK Fig 14 F1 Start frequency F2 Stop frequency Tw Sweep time Ts the time when the next sweep starts OK Confirms the settings and starts the sweep 4 3 Frequency shift keying Pressing the soft button corresponding t
19. pp to10Vpp All other units channel Output impedance 50 CharacteristicsModulation flatness 5 Sine wave flatness lt 0 5dB 0 1Hz to 4MHz lt 1 0dB 4MHz to10MHz lt 2 0dB 10MHz to 40MHz DC offset 100 to 100 peak peak aveform internal waveforms Amplitude open circuit 200mVpp to 20Vpp 600 100mVppto10Vpp Output impedance 600 range 0 1Hz to 20KHz Output terminal ASK mode synchronization output Level TTL Pulse width tw 10u S lt tw lt 100s Intervals ts 10u S lt ts lt 100s B OUT characteristics Pulse signal SWEEP Frequenc Sweep range 1Hz to upper limit minimum frequency step 0 4Hz Sweep time 10mS to 10S 10mS to 40S B8040FD Trigger mode internal external single 29 Trigger internal external single Carrier waveform frequency 1Hz to upper limit Frequency resolution 0 4Hz Carrier waveform All internal waveforms Phase 360 to 360 degree Burst pulse 1 to 65535 Carrier waveform All internal waveforms except square wave Carrier waveform frequency 1Hz to upper limit Frequency resolution 0 4Hz Modulation waveform All internal waveforms Modulation frequency 100mHz to 20kHz Modulation frequency stability 50ppm Modulation depth 0 to100 Input impedance 100k Modulation depth Set by the amplitude of the external modulation signal Internal amplitude modulation E
20. requency shift key fsk The soft button that corresponds to the gt symbol when pressed displays the next group of modulations as shown in Fig 9 Continuous Figure 9 shows the menu for selecting Phase shift key psk Amplitude shift key ask and Burst modulations and their corresponding soft button Pressing the soft button that corresponds to the lt symbol returns the display to the previous menu Pressing the soft button corresponding to the gt symbol displays the next group of modulations and is shown in figure 10 Continuous pm Fig 10 shows the menu for selecting frequency modulation fm Phase modulation pm and the amplitude modulation am and their corresponding Soft buttons Pressing the soft button corresponding to the gt symbol displays the EXT amplitude selection menu anda waveform demo as shown in fig 11 Continuous extam Demo 14 4 Modulation set up menus The following paragraph will explain the various modulation menus and the parameter that are needed to be set 4 1 Linear sweep Pressing the soft button corresponding to the linear sweep the menu as shown in fig 12 is displayed on the LCD The first line displays the selected modulation and the second line displays the sweep parameters and their corresponding soft buttons to set these parameters MODE linear sweep fl f2 tw ts OK Fig 12 F1 Start frequency F2 Stop frequency Tw Sweep time Ts The time when the next swee
21. s the waveform 4 9 Internal AM modulation MODE internal AM fo fm dp wa OK Fig 21 Fo Carrier wave frequency Fm Modulation wave frequency Dp Amplitude modulation depth modulation Wa Modulating waveform OK Confirms the settings and starts the waveform 4 10 External AM modulation MODE external AM lt extam demo 19 The External amplitude modulation has no parameter setup menu Selecting extam in the Mode menu enables the External modulation input located on the rear panel of the instrument The modulating waveform from an external signal or function generator can be applied to this input The carrier signal frequency amplitude and waveform is set with the WaveF Freq and Amp buttons as explained on pages 8 through 11 A 0 4V p p signal will 100 modulate a 1Volt p p carrier signal Note the auxiliary output waveform maybe used as a modulating source 4 11 Demo B8040 FD only 11 Lissajous pattern demonstration Phase 0 lt extam demo Fig 23 In this mode the generator outputs the same frequency sine wave on both the main output and the B OUT terminals simultaneously The frequency is set by the Freq button Set an oscilloscope to the X Y mode and connect the main output to the X input of the oscilloscope and the B OUT to the Y input Adjust the phase difference between the signals by rotating the Encoder knob and observe the pattern on the oscilloscope This mode may be also used when 2
22. s with a keyboard or an Encoder knob 1 4 General Information 1 4 1 Contents eo 1 B8000FD series DDS Generator o 1 AC power cord eo 1BNCto Alligator clip test lead e 1 Operating manual 1 4 2 Safety 1 Before operating read and understand the user manual thoroughly on how to use this instrument 2 Before connecting the power cord verify that line input voltage 110 220V is set properly 3 Use only a fast blow fuse 250V AC 0 25A 4 Do not apply voltage to the output connector 5 Do not apply voltage over 10V p p to the input connector 6 Do not use or store this inst rument in a location near heat source or in a place subject to high humidity 7 This instrument should only be serviced by a competent electronics technician 2 Unit Description 2 0 Panel description 2 1 Front Panel outputs There are 3 BNC signal outputs on the front panel o Main OUTPUT Main output with an impedance of 50 Q 3 SYN 09 This output is a TTL level signal which is active for all waveforms except Sine and square waves lt is the same frequency as the selected waveform at the main output terminal and is used for synchronizing external equipment to the generator For Sweep the SYN signal is high during the time the waveform is sweeping and low during the inactive time the waveform is waiting for the next sweep to start When using FSK the positive portion of the sync signal is high for the duration the FSK signal TW is at th
23. xternal amplitude modulation Carrier waveform all internal waveforms Carrier waveform frequency 1Hz to upper limit Frequency resolution 0 4Hz Modulation waveform All internal waveforms Modulation frequency 100mHz to 10KHz Frequency stability 50ppm Frequency deviation range 1Hz to upper limit Frequency modulation Carrier waveform Sine square Carrier waveform frequency 1Hz to upper limit Frequency resolution 0 4Hz Modulation waveform internal waveforms Modulation frequency 100mHz to 10KHz Frequency stability 50ppm Phase modulation Wax pnase O a Frequency Tested frequency range 1Hz to 100MHz counter Input signal gt 100mV Ranges MHz to 100Khz and 100KHz to 100MHz Specifications are subject to changes without notice 31 Protek Test amp Measurement 45 Smith Street Englewood NJ 07631 USA Tel 1 201 227 1161 Fax 1 201 227 1169 Email sales protektest com http www protektest com
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