Tektronix TDS 340A

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Using the FFT

TDS 340A, TDS 360 & TDS 380 User Manual

3–33

3. Press the front-panel MATH button to display a math waveform.

4. Press the FFT side-menu button to select the FFT waveform. To select a

different source channel, press the FFT side-menu button repeatedly. See

Figure 3–22.

Figure 3–22: Define FFT waveform menu

NOTE. The FFT math waveform vertical scale factor is dBV

RMS

, which is dB

relative to 1 V

RMS

(0 dB =1 V

RMS)

5. Press the HORIZONTAL MENU button and then press the main-menu

button Fit to Screen.

6. Press the side-menu button On to display a complete frequency spectrum,

from DC to the Nyquist frequency.

Main Page

Table of Contents5
General Safety Summary11
- Safety Terms and Symbols12
- Certifications and Compliances13
- General Care15
Appendix D: General Care and Cleaning15
Getting Started19
Start up20
Figure 1-1: the ON/STBY Button21
Line Fuse Replacement21
Figure 1-2: Line Fuse Removal22
Self Test23
Figure 1-3: Verifying Adjustments and Signal Path Compensation24
Figure 1-4: Hookup for Functional Test25
Display and Power Controls31
Vertical Controls32
Horizontal Controls33
Trigger Controls34
Miscellaneous Controls35
Display Map36
Inputs37
Rear-Panel Connectors38
Using the Menu System39
Figure 2-1: Using Menus40
Figure 2-2: a Pop-Up Menu41
Figure 2-3: Connecting a Probe42
Using the Probes42
Figure 2-4: Probe Compensation Setup43
Figure 2-5: Compensation Waveform43
Figure 2-6: How Probe Compensation Affects Signals44
Figure 2-7: Location of Probe Compensation Adjustment44
Table 2-1: Autoset Defaults45
Figure 2-8: the AUTOSET Button45
Using Autoset45
Introduction49
Figure 3-1: the VERTICAL MENU Button51
Manipulating Waveforms51
Vertical Operations51
Figure 3-2: the Vertical Menu52
Figure 3-3: Inverting a Waveform53
Figure 3-4: the HORIZONTAL MENU Button54
Figure 3-5: the Horizontal Menu54
Horizontal Operations54
Figure 3-6: the MATH Button56
Displaying Math Waveforms56
Figure 3-7: a Math Waveform57
Figure 3-8: the TRIGGER MENU Button59
Triggering59
Edge Triggering59
Figure 3-9: the Edge Trigger Menu60
Figure 3-10: the Video Trigger Menu62
Video Triggering62
Figure 3-11: the Video Scan-Rate Menu63
Figure 3-12: the MEASURE Button65
Taking Measurements65
Automated Measurements65
Figure 3-13: the Measure Menu and Active Measurements66
Table 3-1: Measurement Definitions67
Taking Measurements with Cursors69
Figure 3-14: the CURSOR Button70
Figure 3-15: the Cursor Menu70
Figure 3-16: Paired Cursor Measurements of a Sine Wave71
Controlling Acquisition73
Figure 3-17: the ACQUIRE Button73
Figure 3-18: the Acquire Menu73
Controlling the Display75
Figure 3-19: the DISPLAY Button75
Figure 3-20: the Display Menu75
Using the FFT79
Description79
Operation80
- Figure 3-21: System Response to an Impulse80
- Figure 3-22: Define FFT Waveform Menu81
- Figure 3–23: Cursor Measurement of an FFT Waveform83
- Figure 3–24: FFT Time Domain Record Vs. FFT Frequency Domain Record84
Considerations for Using Ffts84
- Figure 3–25: How Aliased Frequencies Appear in an FFT86
- Figure 3–26: Windowing the FFT Time Domain Record87
- Figure 3–27: the HARDCOPY Button89
Making Hard Copies (Option 14 Equipped Instruments Only)89
- Figure 3–29: the System I/O Menu90
- Figure 3–28: the UTILITY Button90
Configuring Hard Copy Output90
Saving a Hard Copy to Disk91
Saving and Recalling Waveforms93
Figure 3–30: the Reference Waveform Buttons93
Using Reference Waveforms93
Figure 3–31: a Reference Waveform Menu94
Using the Disk95
Figure 3–32: Save Format Menu96
Viewing a Waveform on a Spreadsheet97
- Figure 3–33: the SAVE/RECALL Button99
- Figure 3–34: the Save/Recall Menu99
Saving and Recalling Front-Panel Setups99
Using Internal Memory100
Using the Disk101
Figure 3–35: File Utilities103
Using the File System103
- Figure 3–36: File System — Labelling Menu105
- Figure 3–37: the UTILITY Button107
Using the Utility Menu107
Figure 3–38: the Utility Pop-Up Menu108
Setting the Date and Time108
- Figure 3–39: Date and Time Display109
- Table A-1: Warranted Characteristics - Signal Acquisition System113
- Warranted Characteristics113
- Table A-2: Warranted Characteristics - Time Base System114
- Table A-3: Warranted Characteristics - Triggering System115
- Table A-4: Power Requirements115
- Table A-5: Warranted Characteristics - Environmental116
Appendix A: Specifications113
- Table A-6: Typical Characteristics - Signal Acquisition System117
- Typical Characteristics117
- Table A-7: Typical Characteristics - Triggering System118
- Table A-8: Typical Characteristics - Probe Compensator Output118
- Nominal Traits119
- Table A-10: Nominal Traits - Signal Acquisition System119
- Table A-9: Typical Characteristics - Data Handling119
- Table A-11: Nominal Traits - Time Base System120
- Table A-12: Nominal Traits - Triggering System120
- Table A-13: Nominal Traits - Display System121
- Table A-14: Nominal Traits - I/O Interface Option121
- Table A-15: Nominal Traits - Power Distribution System121
- Table A-16: Nominal Traits - Mechanical Characteristics122
- Figure A–1: TDS 340A, TDS 360, and TDS 380 Dimensions123
- Table A-17: Certifications and Compliances124
Appendix B: Performance Verification125
Conventions125
- Figure B–1: Menu Locations126
- Table B-1: Test Equipment127
Test Record128
Performance Test Overview129
Signal Acquisition System Checks129
- Figure B–2: Hookup for DC Voltage Measurement Accuracy Check130
- Table B-2: DC Accuracy131
- Figure B–3: Hookup for Analog Bandwidth Check132
- Figure B–4: Measuring Analog Bandwidth133
- Figure B–5: Hookup for Sample Rate Check134
Time Base System Checks134
Trigger System Checks135
- Figure B–6: Hookup for Trigger Sensitivity Check136
- Figure B–7: Measuring Trigger Sensitivity137
Sine Wave Generator Leveling Procedure138
Figure B–8: Hookup for Sine Wave Generator Leveling139
Appendix C: Options and Accessories141
Options141
- Table C-1: VGA Output Connector Pins141
- Table C-2: International Power Cords141
- Table C-3: Language Options142
- Table C-4: Standard Accessories143
- Table C-5: Optional Accessories143
Accessory Probes144
- Table C-6: Accessory Cables144
General Care145

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