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Function Generator - Tektronix AFG3000 Series Guide

1. Buttons to push Type Buttons to push Type Square FB Square FB Frequency Period Phase Menu BB Frequency Period Phase Menu BB Frequency BB Period BB 1 NK 1 NK MHz BB us BB IB IB Amplitude Level Menu BB Amplitude Level Menu BB High Level BB Amplitude BB 5 NK 5 NK V BB VPP BB Low Level BB Offset BB 0 NK 25 NK V BB V BB 11 Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University Example 2 Define a pulse waveform with the following properties Frequency 1 MHz Duty 10 High 5 V Low OV tig 25 ns tre 15 ns Two possible setups either one would work Buttons to push Type Buttons to push Type Pulse FB Pulse FB Frequency Period Delay Menu BB Frequency Period Delay Menu BB Frequency BB Period BB 1 NK 1 NK MHz BB us BB t IB 4 IB Amplitude Level Menu BB Amplitude Level Menu BB High Level BB High Level BB 5 NK 5 NK V BB V BB Low Level BB Low Level BB 0 NK 0 NK V BB V BB 4 IB 4 IB Pulse Parameter Menu BB Pulse Parameter Menu BB Duty BB Width BB 10 NK 0 1 NK BB us BB Leading Edge BB Leading Edge BB 25 NK 25 NK ns BB ns BB Trailing Edge BB Trailing Edge BB 15 NK 15 NK ns BB ns BB 12 Tektronix AFG3000 Series Function Generator Guide v1 0 Examp
2. GeO VE tO ol k DODD OOO 1 M E si 5 8 i FUNCTION GENERATOR GUIDE Tektronix AFG3000 Series Portland State Department of Electrical amp Computer Engineering Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University 1 Introduction This guide provides instructions for operating the Tektronix AFG3000 Series of function generators Features Tektronix AFG3102 zs e Standard waveforms sine square ramp triangle and pulse e Arbitrary waveforms with high sampling rates e Sweep burst and modulation AM FM PM FSK PWM e Large LCD display with on screen menus for easy setup wem e One or two independent output channels e BNC output connectors e USB GPIB and LAN interfaces Table 1 Quick specs for different function generator models in PSU ECE Labs Output Maximum Sinusoid Maximum Sampling Maximum Output Model Channels Frequency MHz Rate GS s Amplitude Vp p into 50 Q AFG3021B 1 25 0 25 10 AFG3052C 2 50 1 10 AFG3102 2 100 1 10 AFG3252 2 240 2 5 Note Channels have a 50 Q output impedance Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University 2 Waveform Shapes The AFG3000 Series outputs these standard waveforms Sine Ramp rising Square Ramp falling Triangle Pulse Figure 1 Idealized waveform shapes In addition the function generator
3. to bypass the bezel menus and immediately access common waveform parameters Once selected the parameter can be edited or changed using the keypad or knob Note The first press of a Waveform Parameter button selects the parameter If pressed again the parameter toggles between the pair of choices Frequency Period Selects either Frequency or Period Amplitude High Selects either Amplitude or High Offset Low Selects either Offset or Low Phase Delay Selects either Phase angle or Delay time Duty Width Selects either Duty cycle or Width time of a pulse Leading Trailing Selects either Leading edge or Trailing edge of a pulse Note The Duty Width and Leading Trailing buttons only work when Pulse is the selected function The AFG3000 Series does not have a function button dedicated to the triangle waveform Instead the Ramp Parameter bezel menu has three options for symmetry 0 rising ramp 50 triangle and 100 falling ramp 8 Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University gt Run Mode Buttons These control the operating mode of a waveform signal Continuous Modulation Sweep Burst Activates the continuous output signal mode default Activates the modulation mode and displays a parameter menu Activates the sweep mode and displays a parameter menu Activates the burst mode and displays a parameter menu gt Menu Buttons These buttons reveal menus for special fun
4. 1 kHz V Pulse Width 0 5 ms Duty 50 5 1 1 VA 0 t ms 0 i 1 i 2 3 e re Delay Pulse Period 1 0 ms 0 3 ms Pulse Freq 1 kHz V Pulse Width 0 1 ms Duty 10 5 I 1 0 t ms 0 1 2 3 _ i Delay Pulse Period 1 0 ms 0 3 ms Pulse Freq 1 kHz Figure 4 Examples of ideal pulse trains Ampl 5 V Offset 2 5 V or High 5V Low 0 V Depending on the situation a pulse s leading and trailing edge transition times may be relevant ticis the leading edge transition time tre is the trailing edge transition time The transition times are specified using the 1096 and 9096 amplitude points as references i If t and tre are a significant fraction of the total tie _ te lt width then the 50 amplitude point is a better reference for specifying the pulse width Figure 5 Edge transition widths for a realistic non ideal pulse Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University 4 Instrument Front Panel Tektronix AFG 3 1 02 AED PRAET PONCYION GENERATOR yk T op Menu LCD Display Area shows button setup menus and help pages e a graphical view of waveforms e waveform parameters e numeric input status and error messages Menu Go Back Power button Switch View button USB Memory port Figure 6 AFG3102 front panel detail view left side Copyright Tektronix Inc Run Mode buttons Wa
5. 100 ps Other Waveforms 1 Hz to 250 kHz 1 uHz to 800 kHz 1 WHz to 1 MHz 1 pHz to 2 4 MHz Noise Bandwidth 25 MHz 50 MHz 100 MHz 240 MHz 3 dB White Gaussian White Gaussian White Gaussian White Gaussian DC into 50 Q 5Vto 5V 5 V to 5 V 5Vto 5V 2 5 V to 2 5 V Arbitrary Waveforms 1 mHz to 12 5 MHz 1 mHz to 25 MHz 1 mHz to 50 MHz 1 mHz to 120 MHz Effective Analog Bandwidth 3 dB 70 MHz 70 MHz 100 MHz 225 MHz 2 to 16 K 1 GS s 2 to 16K 1 GS s 2 to 16K 2 GS s 4 ns at 250 MS s 4 ns at 250 MS s Sample Rate 2 to 128K 250 MS s ek 128K 250 MS s gt 16K 128K 250 MS s gt 16K 128 K 250 MS s Vertical Resolution 14 bits Rise Time Fall Time lt 14ns lt 10 ns lt 8ns lt 3ns Jitter RMS P 1ns at 1 GS s 1ns at 1 GS s 500 ps at 2 GS s 4 ns at 250 MS s Amplitude 50 Q load 10 mV to 10 Vp p 10 mV to 10 Vp p 20 mV to 10 Vp p 50 MVp p to 5 Vp p Amplitude Open Circuit 20 mV to 20 Vp p 20 MVp to 20 Vp p 40 MVp p to 20 Vp p 100 mV to 10 Vp p Accuracy 1 of setting 1 mV 1 kHz sine wave 0 V offset gt 10 mV amplitude Resolution 0 1 MVp p 0 1 mVnys 1 mV 0 1 dBm or 4 digits Units Vp p Vrms dBm sine wave only V high low Output Impedance 50 Q 16 Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University Appendix 2 Refe
6. 46 100 1 3333 1 3333 1 3171 1 2720 1 1290 500 1 8181 1 8181 1 7778 1 6712 1 3807 1000 1 9047 1 9047 1 8585 1 7377 1 4175 10K 1 9900 1 9899 1 9374 1 8017 1 4516 100K 1 9998 1 9998 1 9465 1 8090 1 4554 15 Tektronix AFG3000 Series Function Generator Guide v1 0 Appendix 1 Technical Specifications Portland State University Table 4 Manufacturer s specifications Model AFG3021B AFG3052C AFG3102 AFG3252 Channels 1 2 2 2 Standard Waveforms Sine Square Ramp Triangle Pulse DC Noise Sin x x Exponential Rise amp Decay Gaussian Lorentz Haversine Sine Waveform 1 Hz to 25 MHz 1 Hz to 50 MHz 1 uHz to 100 MHz 1 uHz to 240 MHz Square Waveform 1 Hz to 12 5 MHz 1 Hz to 40 MHz 1 Hz to 50 MHz 1 uHz to 120 MHz Rise Fall Time lt 18ns lt 7 ns lt 5ns lt 2 5 ns Jitter RMS typical 500 ps 300 ps 200 ps 100 ps Ramp Waveform 1 Hz to 250 kHz 1 uHz to 800 kHz 1 Hz to 1 MHz 1 pHz to 2 4 MHz Pulse Waveform 1 mHz to 12 5 MHz 1 mHz to 40 MHz 1 mHz to 50 MHz 1 mHz to 120 MHz Pulse Width 30 0 ns to 999 99 s 12 0 ns to 999 99 s 8 00 ns to 999 99 s 4 00 ns to 999 99 s Resolution 10 ps or 5 digits Pulse Duty 0 001 to 99 999 Edge Transition Time 18 ns to 625s 7 ns to 625s 5 ns to 625s 2 5 ns to 625s Overshoot typical 596 Jitter RMS typical 500 ps 300 ps 200 ps
7. Time Phase V MHz S li mV kHz ms Vp Hz us mVpp mHz ns gt Knob and Arrow Keys When entering or editing a numeric value the left and right arrow keys move an underline cursor to select a specific digit within the number The rotary knob can then be used to either increment or decrement the value of the selected digit Note Using the knob and arrow keys is optional Numbers can be entered directly with the keypad Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University gt Function Buttons These buttons pick which waveform will be output on the currently selected channel When pressed the button becomes illuminated and the parameter menus for the waveform are displayed on the screen Sine Selects the sine waveform Frequency Period Phase Amplitude Level Run Mode Output Square Selects the square waveform Frequency Period Phase Amplitude Level Run Mode Output Ramp Selects the ramp waveform Ramp Parameter Frequency Period Phase Amplitude Level Run Mode Output Pulse Selects pulse waveform Pulse Parameter Frequency Period Delay Amplitude Level Run Mode Output Arb Selects the user defined arbitrary waveform Arb Waveform Frequency Period Phase Amplitude Level Run Mode Output More Displays options for choosing additional built in waveforms More Waveform Frequency Period Phase Amplitude Level Run Mode Output gt Waveform Parameter Buttons These allow the user
8. al source has amplitude Va The generator s output impedance is Ro Let Vo be the voltage present at the output terminals of the generator AFG3000 series Ro Ro 50 Q Function Generator Figure 10 Load connected to output terminals of the function generator Let Vser be the amplitude value that the user sets on the front panel of the function generator By default the instrument assumes an impedance match i e R is equal to Ro so it automatically produces a Vs that is twice the value of Vser i e Va 2Vser The value of Vo can be calculated by realizing that Ro and R form a voltage divider General solution for any value of Ri when Ve 2Vser R R 2R Vo y Jev o F Vg where F g R R o R Ro R Ro The output voltage Vo is a scaled version of Vser The scale factor F is between 0 and 2 inclusive Special case 1 R Ro impedance is actually matched i e R 50 Q F z 1 so Vo Vser Implication The voltage present at the generator s output terminals is equal to the set voltage Special case 2 R oo open circuit i e no load attached gt 7 x 2 so Vo 2Vser Implication The voltage present at the generator s output terminals is twice the set voltage Note To make the instrument generate an output voltage that corresponds to the desired set voltage when the load resistance is not 50 Q perform this procedure 1 Pressthe Top Menu button on the front panel 2 Selec
9. atus Duty 50 0 Deviation 6 0 High Level Bezel menu 500 ml Level meter ERO I View tab Figure 8 Sample AFG3102 onscreen interface Copyright Tektronix Inc Note The LCD screen displays information for only one channel at a time On a dual output function gnerator use the Ch1 Ch2 button to switch between the channels Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University gt Keypad The keypad is used for entering or editing numeric values 0 9 Digit and decimal point buttons are used for numeric input The button toggles the sign of a number from positive to negative or from negative to positive Enter The Enter button completes entry of a value Cancel This cancels a pending action BKSP The backspace button is active during entry of anumber When pressed it deletes the currently selected digit A waveform has multiple numeric parameters that define its characteristics If a parameter is selected via a bezel button the value becomes highlighted on the LCD screen At that point pushing any keypad button will activate the numeric input mode A cursor indicates the currently selected digit In numeric input mode the bezel menus show units that are appropriate for the value By pressing one of the bezel buttons the unit becomes attached to the number and numeric input is completed Table 2 Some standard units available as bezel menus Voltage Freq
10. ction generator operations Edit Utility Save Recall Help Default Edit menu is used for editing or creating user defined waveforms Utility menu gives access to system utilities such as diagnostics Save menu allows saving of new function generator setups to internal memory or an external USB memory device Recall menu allows recall of existing function generator setups from internal memory or an external USB memory device Help accesses the built in help documentation The Default button restores the instrument s settings to their default values gt Channel Buttons CH1 CH2 Channel On The AFG3052C 3102 and 3252 models have two output channels Each channel can generate its own independent waveform This button selects which channel s settings are selected for display or editing on the LCD screen The AFG3021C model only has a single output channel so the instrument does not have this button Each channel has its own button for turning its output signal either on or off When the output is in the on state the button is illuminated gt Manual Trigger Button Manual This button manually triggers the function generator to initiate a single sweep in Trigger Sweep mode Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University gt Output Connectors The output signals from the function generator are available at the BNC connectors on the front panel If a channel is c
11. le 3 Portland State University For Channel 1 define a sine waveform with the following properties Frequency 10 MHz Amplitude 2 V Offset 0 5 V Phase 0 For Channel 2 define a sine waveform with the following properties Period 0 1 us High 1 5 V Low 0 5 V Phase 45 lf necessary push the CH1 CH2 button until Channel 1 is selected The default phase is 0 so it really isn t necessary to set it explicitly in this case Setup for Channel 1 Setup for Channel 2 Buttons to push Type Buttons to push Type CH1 CH2 CB CH1 CH2 CB Sine FB Sine FB Frequency Period Phase Menu BB Frequency Period Phase Menu BB Frequency BB Period BB 10 NK 0 1 NK MHz BB us BB Phase BB Phase BB 0 NK 45 NK BB j BB IB IB Amplitude Level Menu BB Amplitude Level Menu BB Amplitude BB High Level BB 2 NK 1 5 NK Vpp BB V BB Offset BB Low Level BB 0 5 NK 0 5 NK V BB V BB Mf necessary push the CH1 CH2 button until Channel 2 is selected In this example the two signals are identical except the Channel 2 waveform is shifted in phase with respect to the Channel 1 waveform 13 Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University 9 Output Voltage Amplitude Suppose a load R is connected to an output channel on the function generator The sign
12. rences 1 Tektronix AFG3000 Series Data Sheet Tektronix Inc 2 Tektronix AFG3000 Series Arbitrary Function Generators Quick Start User Manual 071 1631 03 Tektronix Inc 3 Tektronix AFG3000 Series Arbitrary Function Generators Reference Manual 071 1639 03 Tektronix Inc 17
13. supports user defined waveforms of arbitrary shape Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University 3 Waveform Characteristics Voltage V lt Period Phase Figure 2 Characteristics of a periodic waveform Tektronix terminology The amplitude of the waveform is the peak to peak variation in voltage The horizontal shift can be specified as a phase angle in degrees The waveform s vertical characteristics i e voltage can be specified as an amplitude and offset or as high and low levels Some useful conversion equations are Frequency Amplitude High Low E TTE Period PN l 1 _ High Low f Period Offset EE Pops Amplitude Frequency 2 V GEM NN lun m rM ME E Mr qa MI 40 75 V 100V NN NN 40 25 V t ms Me se Neca aa alee chs ce ceo 0 25 V Ampl 1 00 V Phase Offset 0 25 V Period High 0 75 V Freq Low 0 25 V 1 kHz Figure 3 Example sinusoidal waveform with numeric values Math textbooks often define the amplitude as half the peak to peak variation However Tektronix assumes the amplitude is the full peak to peak value Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University Pulse Width For a pulse train the pulse duty cycle in is defined as Duty HBe 100 Pulse Period V Pulse Width 0 9 ms Duty 90 t ms 1 2 3 Delay Pulse Period 1 0 ms 0 3 ms Pulse Freq
14. tthe Output Menu bezel button 3 When the new menu appears press the Select Load Impedance bezel button 4 If R gt 10k Q pick the High Z option For R lt 10k Q pick Load and enter the actual R value 14 Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University Example You connect a function generator with output impedance Ro 50 Q to a test circuit which has a load resistance of R You configure the generator to output a sinusoid of amplitude Vser 1 Vp p at frequency fser The voltage V across the load is monitored with an oscilloscope using a 1x probe The oscilloscope has an input resistance of Rin 1M Q in parallel with an input capacitance of Cj 15 pF Function Function Test Generator Generator Circuit Oscilloscope Test Circuit ES Ground Figure 11 Example test circuit with oscilloscope The function generator sees the load in parallel with the oscilloscope s input impedance R R 2Z ro 1 1 1 Zro R IR I Ze jac __ gt V V is m E R R JOC R R I Z F Ro id L in Table 3 Calculated load voltage V versus load resistance R at specific signal frequencies fser Given Vser 1 Vp p Rin 1M Q Cin 15 pF V volts a Q fser 0 Hz DC fser 1 MHz fser 50 MHz fser 100 MHz fser 200 MHz 10 0 3333 0 3333 0 3331 0 3323 0 3293 50 1 0000 1 0000 0 9931 0 9733 0 90
15. urrently disabled the output signal is turned off at the corresponding BNC connector Ch1 Output Output connector for the Channel 1 waveform signal Ch2 Output Output connector for the Channel 2 waveform signal Trigger Output This connector outputs a TTL level pulse that is synchronized with the output from Channel 1 This can be used to trigger an attached instrument such as an oscilloscope Note The output impedance Ro of each channel is 50 Q Female BNC AFG3102 Male BNC Cable Figure 9 BNC connections 10 Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University 7 Standard Setup Procedure 1 Disable the channel outputs 2 Foreach channel you intend to use a Select the channel if needed b Select the desired function e g sine square etc c Adjust the waveform parameters using the Bezel buttons or Waveform Parameter buttons d Verify the parameter values to ensure the voltages and frequencies are within safety limits 3 Enable the channel outputs 8 Examples The Type codes are IB Interface Button BB Bezel Button FB Function Button CB Channel Button NK Numeric Keypad In Examples 1 and 2 assume the currently selected channel is Channel 1 Example 1 Define a square waveform with the following properties Frequency 1 MHz High 5 V Low 0 V Two possible setups either one would work
16. veform Parameter buttons Function Ade Knob amp wave orm Arrow Keys selection Keypad Channel buttons on Manual Trigger Output lA button BNC connectors O Menu buttons Figure 7 AFG3102 front panel detail view right side Copyright Tektronix Inc Tektronix AFG3000 Series Function Generator Guide v1 0 Portland State University gt Instrument Power Power Switch This turns the entire function generator either on or off gt Interface Buttons These buttons control the function generator s onscreen interface Top Menu The AFG3000 Series has a menu based system for viewing or changing various instrument settings The menus use a branching tree design so this button returns to the top most level of the menu tree E Each press of this button goes back one level in the menu tree Bezel Bezel buttons are used to select bezel menu options that are displayed in an adjoining column on the LCD screen The actions assigned to the five Bezel buttons depend on which menu is currently active View The function generator can display information on the LCD screen in several formats waveform parameter and graph graph comparison and waveform parameter comparison Each press of the View button toggles through the display formats Message display area Numeric input is available Knob is available CHI PWM Freq 1 0 T18 00 ns Main display MU vp SP A Offset area V Offset PWMFreq 10 00 kte Output st

Function Generator - Tektronix AFG3000 Series Guide

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