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Triggering
3-42
CSA8000B & TDS8000B User Manual
Trigger Sources. The trigger source provides the signal that the trigger system
monitors. The source can be:
H the internal clock of the instrument (TDR clock rate), with user-selectable
clock frequencies. The Internal Clock Out connector supplies a replica of the
internal clock at the instrument front panel. See Figure 3--13 on page 3--42.
H an external signal coupled to one of the trigger input connectors (see
Figure 3--13) on the front panel:
H External Direct, DC coupled and usable with signals up to at least
3.0 GHz
H External Prescale, divided by 8 and usable with signals up to at least
12.5 GHz
NOTE. The upper limit is determined by signal input level; this is enhanced by
the optional accessory 80A01.
H an internal clock-recovery trigger provided by an optical sampling module
equipped with a clock-recovery option. Clock recovery is user-selectable for
triggering rates that depend on the sampling module used; for example,
either 622 Mbps (OC-12/STM-4 standards) or 2.488 Gbps (OC-48/STM-16
standards) for the 80C01-CR Optical Sampling Module.
Some optical sampling modules support continuous-rate clock recovery. If
you have such a module installed, a user-defined custom clock recovery rate
is selectable from the Trigger Source Setup menu.
Trigger
prescale
input
Trigger
direct
input
Trigger
probe
power
Internal clock output
Figure 3- 13: Trigger inputs
- User Manual 1
- 071-1099-03 1
- WARRANTY 3
- Table of Contents 5
- Operating Basics 6
- Reference 6
- Appendices 9
- List of Figures 10
- List of Tables 12
- General Safety Summary 13
- Symbols and Terms 14
- About This Manual 15
- Conventions 16
- Contacting Tektronix 17
- Product Description 19
- Product Software 21
- Firmware Upgrade 22
- Sampling Modules Supported 22
- Check the Package Contents 25
- Installation 27
- Install the Sampling Modules 28
- Maximum Configuration 29
- Connect the Peripherals 30
- Power On the Instrument 31
- Powering Off the Instrument 33
- Back Up User Files 33
- Software Installation 33
- Incoming Inspection 35
- Perform the Diagnostics 36
- Perform the Compensation 38
- Perform the Functional Tests 39
- Verify Electrical Input 40
- Channels 40
- CSA8000/TDS8000 41
- SMA cable from DC calibration 41
- DC CAL Output Limits 43
- Control bar 45
- Vertical offset 45
- Baseline 45
- Verify the 46
- Time Bases Work 46
- Perform Gated Trigger 50
- QA+Win32 56
- Checking the Cooling Fan 57
- Operation 57
- Checking the Hardware 57
- Accessories and O ptions 59
- Optional 60
- Accessories and Options 62
- Operational Maps 63
- Documentation Map 64
- <NR3><Space> 65
- System Overview Maps 66
- Process Overview Map 68
- and position controls 69
- to a waveform 71
- Display Map -- Multiple Views 72
- Front Panel I/O Map 73
- Rear Panel I/O Map 74
- Overview 75
- Horizontal 78
- To Set Up the Signal Input 82
- knob to adjust the selected 83
- To Autoset the Instrument 85
- To Reset the Instrument 87
- Signal Conditioning 87
- Background 87
- Apparent low-frequency 97
- Sampled points 97
- To Set Acquisition Modes 98
- To Start and 100
- Stop Acquisition 100
- Acquisition Hardware 101
- Sampling Process 101
- Sampling Modes 102
- Waveform Record 102
- Acquisition Cycle 103
- FrameScan Acquisitions 104
- What’s Excluded? 105
- Keys to Using 105
- To Acquire in 107
- FrameScan Mode 107
- Acquiring Waveforms 108
- End of Procedure 109
- ToCatchaBitError 110
- Triggering 113
- To Trigger 122
- To Use Gated Trigger 124
- Displaying Waveforms 127
- Why Use? 129
- What’s Special? 129
- Ch Ref Math 131
- Reference / 100) 133
- To Display Waveforms in 136
- To Display Waveforms 138
- Customizing the Display 140
- To Set Display Styles 142
- To Customize the 143
- Graticule and Waveforms 143
- Measuring Waveforms 147
- Taking Automatic Measurements 148
- Select among methods 151
- To Take Automatic 154
- Measurements 154
- To Localize a 157
- Measurement 157
- Taking Cursor Measurements 159
- What Sources 160
- Can I Measure? 160
- Keys to Using Cursors 160
- To Take a Cursor 163
- To Set the Cursor Sources 164
- Compensation 166
- To Compensate the 166
- Instrument and Modules 166
- To Deskew Channels 170
- To Perform Dark-Level 172
- Compensations 172
- Creating Math Waveforms 175
- To Define a 179
- Math Waveform 179
- Operations on Math Waveforms 181
- of a math wavef orm 183
- settings in the source 183
- Data Input and Output 187
- To Save Your Setup 189
- To Recall Your Setup 192
- To Save Your Waveform 195
- To Recall Your Waveform 198
- To Clear References 201
- To Export Your Waveform 202
- To Export Your Histogram 203
- To Use an Exported 203
- Waveform (or Histogram) 203
- Printing Waveforms 206
- To Print Using 208
- Ink-saver Mode 208
- To Print to a File 210
- Set High Color 211
- Remote Communication 213
- Mask Testing Waveforms 215
- To Mask Test a Waveform 219
- To Edit a Mask 223
- Counting Masks 225
- To Create a New Mask 226
- Taking Histograms 228
- Histograms 229
- To Take a Histogram 230
- Histogram 232
- Statistics 232
- Using Waveform Databases 233
- To Set Up a Waveform 236
- Database 236
- Database Display 238
- Accessing Online Help 241
- How to Use Online Help 242
- Cleaning the Instrument 249
- Flat Panel Display Cleaning 250
- Optical Connector Cleaning 250
- Appendix A: Specifications 251
- Table A- 3: 254
- Table A- 6: Display 257
- Table A- 7: Ports 258
- Table A- 9: Mechanical 260
- Certifications 261
- Pulse Measurements - Timing 270
- Pulse Measurement - Area 276
- All Sources 318
- Pulse Sources 319
- Pulse Crossings and 320
- Mid-reference Level 320
- Mid-reference Level (AOP) 320
- Overshoot Levels 321
- RZ Sources 322
- RZ Crossings 323
- NRZ Sources 324
- NRZ Measurement 325
- Reference Levels 325
- NRZ Crossings 326
- NRZ Eye -Aperture 327
- Parameters 327
- NRZ Overshoot Levels 328
- NRZ Crossings ( OMA) 329
- Tracking Methods 330
- Use a Waveform Database 332
- Glossary 333
- of the selected 337
- Index- 1 343
- Index- 2 344
- Index- 3 345
- Index- 4 346
- Index- 5 347
- Index- 6 348
- Index- 7 349
- Index- 8 350
- Index- 9 351
- Index- 10 352
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