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B8000FD Series

DDS Function Generator

Operators Manual

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Summary of Contents for B8000FD Series

Page 1: ...Protek Test and Measurement B8000FD Series DDS Function Generator Operators Manual ...

Page 2: ...utputs 3 2 2 Rear panel inputs 4 2 3 Front panel controls 5 2 4 Front panel button description 7 3 Using the front panel buttons 8 3 1 Waveform 8 3 2 Frequency 9 3 3 Amplitude 10 3 4 Duty Ratio 12 3 5 Offset 12 3 6 Mode button 13 4 Modulation setup menus 15 4 1 Linear sweep 15 4 2 Log sweep 16 4 3 Frequency Shift key 17 4 4 Phase Shift key 17 4 5 Amplitude shift key 18 4 6 Burst 18 4 7 FM 18 48 Ph...

Page 3: ...on 20 4 11 Demo 20 5 Multifunction menu 21 5 1 Config button 21 5 2 B out 21 5 3 Frequency counter 22 5 4 RS232 23 6 External Trigger 24 6 1 Trigger button 24 6 2 Single trigger 25 6 3 External trigger 25 7 Store Recall 26 Appendix technical Specifications 27 ...

Page 4: ... Sine wave distortion z Log and linear sweeps z Internal and External AM and FM modulation z Dual independent channel outputs z Built with integrated circuits for high reliability and small size z Dual back lit LCD display increases the number of displayed parameters z Built in 100MHz frequency counter z RS 232 interface for connecting to a PC 1 2 DDS Technology DDS is the abbreviation for Direct ...

Page 5: ... 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 menus with a keyboard or an Encoder knob 1 4 General Information 1 4 1 Contents z 1 B8000FD series DDS Generator z 1 AC power cord z 1 BNC to Alligator clip test lead z 1 Operating manual 1 4 2 Safety 1 Before...

Page 6: ...to high humidity 7 This instrument should only be serviced by a competent electronics technician 2 Unit Description 10 4 5 8 9 6 3 2 3 Fig 1 1 7 2 0 Panel description 2 1 Front Panel outputs There are 3 BNC signal outputs on the front panel z Main OUTPUT c Main output with an impedance of 50 Ω z SYN d This output is a TTL level signal which is active for all waveforms except Sine and square waves ...

Page 7: ...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 z B OUT e Second output with an impedance of 600Ω All waveforms with a frequ...

Page 8: ...eter 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 rotated counter clockwise the blinking will decrease 3 The Soft buttons h are for selecting the menu items when the Mode or Config Menus are displayed The Soft buttons are ass...

Page 9: ... 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 dir...

Page 10: ... A signal applied to the External trigger input will externally trigger the generator at the rate of the External input signal z Enter Enters and stores the numeric data which has been entered from the Key board or the rotary dial z 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 pre...

Page 11: ...he left will cause the digit to the left to blink Pressing this key to the right 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 cu...

Page 12: ...e value Pressing the 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 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 Pres...

Page 13: ...its will be cleared and it will blink An 8 digit value plus 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 enter...

Page 14: ...ed using the procedure in the above paragraph Pressing the 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...

Page 15: ...t blinking along with a symbol The new Duty ratio 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 Fig 6 3 5 Offset Pressing Offset button displays the Voltage Offset menu...

Page 16: ...enu 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 ...

Page 17: ...l returns the display to the previous menu Pressing the soft button corresponding to the symbol displays the next group of modulations and is shown in figure 10 Fig 10 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 symbol displays the EXT amplitude sel...

Page 18: ... 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 Fig 12 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 Mode Continuous extam Dem...

Page 19: ...o 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 Not...

Page 20: ... Pressing the soft button corresponding to FSK displays the menu as shown in figure 15 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 MODE FSK f1 f2 tw ts OK MODE PSK fo ph tw ts OK 17 ...

Page 21: ...Tw Carrier frequency duration Ts the time the next waveform starts OK Confirms the settings and starts the waveform 4 6 Burst Pulse waveform 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 Fig 19 MODE ASK fo ph tw ts OK MODE BURST fo ph co ts OK MODE internal FM fo...

Page 22: ...requency Fm Modulating wave frequency modulation Pd Max phase deviation deviation Wa Modulating waveform wave OK Confirms the settings and starts the waveform MODE internal PM fo fm pd wa OK 4 9 Internal AM modulation 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 MODE in...

Page 23: ...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 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...

Page 24: ...s 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 Fig 24 5 2 B OUT Fig 25 Off Turns the B OUT On or Off Wave selects the Wavefor...

Page 25: ...ssage 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 the Continuous CW mode and the modulation off message will briefly appear on the LCD 5 3 Frequency counter Fig 26 Pressing the soft button corresponding to 100MHz will toggle the count...

Page 26: ...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 RS 232 9600 N 8 1 quit WAVE SIN output sine wave WAVE SQUARE output square wave WAVE TRIANGLE output triangle wave WAVE RAMPUP output rising ramp wave WAVE R...

Page 27: ... 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...

Page 28: ... 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...

Page 29: ...me button as the ENTER and ESC buttons Waveforms and waveforms parameters may be saved in memory and recalled at a later time using these functions Pressing the Enter Recall button displays the menu shown in Fig 28 above rotate the encoder knob to the location the waveform settings are to be saved press the ENTER button to save the settings To Recall a waveform setting press the ESC button and rot...

Page 30: ... to 1MHz Maximum resolution 0 1μHz or 8 digits Long term stability 50ppm 0 C to 40 C Precision 0 4Hz 3 1KHz 0 1μHz 100mHz Sine harmonic distortion 50 Ω load 1Vpp output 20kHz 0 2 54dBc 20kHz to 1MHz 0 4 48dBc 1MHz to 10MHz 1 40dBc 10MHz to 20MHz 2 5 22dBc Signal Characteristics Duty ratio 0 1 to 99 9 10kHz Square wave 50Ωload 1Vpp output Rise and fall times 15ns Overshoot 5 Non linearity 1 20ns Pu...

Page 31: ...open circuit 200mVpp to 20Vpp 600Ω 100mVppto10Vpp Output impedance 600Ω Frequency range 0 1Hz to 20KHz Pulse signal Output terminal ASK mode synchronization output Level TTL Pulse width tw 10μS tw 100s Intervals ts 10μS ts 100s SWEEP Sweep range 1Hz to upper limit minimum frequency step 0 4Hz Sweep time 10mS to 40S Trigger mode internal external single FSK PSK ASK BURST Pulse breadth internal 10μS...

Page 32: ...tion signal Frequency 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 Phase modulation Carrier waveform Sine square Carrier waveform frequency 1Hz to upper limit Frequency r...

Page 33: ...30 Technical specifications Specifications are subject to changes without notice ...

Page 34: ...Protek Test 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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