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Tektronix 071-1631-04, AFG3000 Series Motor Speed Control by Pulse-Width Modulation

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Application Examples

AFG3000 Series Quick Start User Manual 77

Motor Speed Control by Pulse-Width Modulation

Pulse-width modulation is used for controlling the speed of a DC motor or the luminance of an LED (Light Emitting Diode).

Use the arbitrary/function generator PWM function to control the DC motor speed.

1. Connect the arbitrary/function genera-

tor output and a DUT using a

BNC-to-alligator clip adapter.

2. Select Pulse as an output waveform

and then select PWM as a modulation

type.

Set the frequency to approximately

100 kHz.

3. Connect the output to an oscilloscope.

Confirm that a pulse-width modulation

waveform is displayed on the oscillo-

scope screen.

Select Pulse Duty and change the duty

rate. Observe that the motor speed

changes if you change the duty rate.

AFG3000 Series

DUT (example: Motor)

Contents

Main Contacting Tektronix Warranty 16 Page Table of Contents ii General Safety Summary To avoid Fire or Personal Injury Symbols and Terms Environmental Considerations Product End-of-Life Handling Equipment Recyc ling. Mercury Notification. Restriction of Hazardous Substances Page Preface ? Documentation viii Conventions Used in this Manual Quick Tutorial 2 To Generate a Sine Waveform Page 4 Accessing Help Getting Started General Features 6 Before Installation Operating Requirements Power Supply Requirements Environmental Standard Accessories 8 Recommended Accessories Powering the Instrument On and Off Power Off Power On To Change Instrument Settings at Power-on 10 Self Test and Self Calibration Selecting a Local Language 12 Protect Your Instrument from Misuse Check Input and Output Connectors Do not mistake Output connectors for Input. Use Fuse Adapter Output Input Floating Ground 14 Protect Your DUT Update Your Instrument Firmware 16 Page 18 Connect to a Network USB Interface Ethernet Setup Page 20 Equivalent Output Circuits 22 Overheat Protection (AFG3011 Only) Getting Acquainted with Your Instrument AFG3000 Series Quick Start User Manual 23 Getting Acquainted with Your Instrument To unlock the front panel without using a remote command, push the front-panel Cancel button twice. Front Panel Overview To Lock or unlock the Front Panel Controls If you need to lock the front panel controls, use the following remote command: Screen Interface Bezel Menu. Main Displa y Area and View T ab. Output Status. Message Displa y Area. Level Meter . View Button 26 Shortcut Buttons Default Setup 28 Select Waveform Page Select Run Mode Adjust Waveform Parameters 32 Channel Select (dual-channel model only) Output ON/OFF Rear Panel Operating Basics Generate a Pulse Waveform 36 Save/Recall Arbitrary Waveforms Generate an Arbitrary Waveform 38 Modify an Arbitrary Waveform (Edit Menu) Arbitrary Waveform Edit Example 1 40 Arbitrary Waveform Edit Example 2 Generate Noise/DC 42 Generate a Burst Waveform T riggered Burst Mode. Gated Burst Mod e . To Generate a Triggered Burst Waveform To Generate a Gated Burst Waveform 44 Sweep a Waveform Page Modulate a Waveform Page 48 To Output an FSK Waveform Page 50 Trigger Out Page 52 Adjusting Parameters of Two Channel Signals (dual-channel model only) Phase Page 54 Set up Load Impedance Invert Waveform Polarity 56 Add Noise Add Signal (AFG3100 and AFG3200 Series) 58 Generating a Differential Signal External Reference Clock (Except AFG3021B and AFG3022B) 60 Synchronous Operation (Except AFG3021B and AFG3022B) Page 62 USB Memory Utility Menu Page Save/Recall Instrument Setup Saving a Screen Image Using the Security Menu Access Protection 68 Changing the Password ArbExpress Screen Interface Page Page Page Page Application Examples Lissajous Patterns 76 Measurement of Filter Characteristics Motor Speed Control by Pulse-Width Modulation 78 Carrier Null (Frequency Modulation) Specifications Electrical (except AFG3011) 80 Page 82 Page 84 Electrical (AFG3011) Page 86 Page 88 Inputs/Outputs General 90 EC Declaration of Conformity EMC EN 61326:1997. EN 61000-3-2:2000. EN 61000-3-3:1995. Eur opean Conta ct. Australia/New Zealand Declaration of Conformity EMC Specifications Instrument Dimensions Dimensions of the RM3100 Rackmount Page Index A B C D M N O P Q V W