LeCroy SDA - Page 126

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mode Mode

Definition:

The value of the highest population bin in a histogram.

Description:

Each bin between the parameter cursors is examined for its population count.

The leftmost bin with the highest count found is selected. Its center value is

returned as mode.

Example:

Here, the mode is 150 mV.

126 SDA-OM-E Rev H

Main Page

Default Chapter3
- Table of Contents3
Introduction18
- How to Use Online Help18
  - Type Styles18
  - Instrument Help18
- Windows Help19
- Returning a Product for Service or Repair19
- Technical Support19
- Staying Up-To-Date20
- Warranty20
- Windows License Agreement20
- End-User License Agreement for Lecroy X-Stream Software21
- Virus Protection27
SDA Specifications28
- Vertical System28
  - Horizontal System29
  - Jitter Noise Floor29
- Acquisition System29
  - Memory30
  - Sda 18000/13000/11000/900030
  - Acquisition Modes30
  - Acquisition Processing30
- Triggering System30
- Automatic Setup31
- Probes31
- Basic Triggers31
- SMART Triggers31
  - SMART Triggers with Exclusion Technology31
- Serial Trigger32
- Clock Recovery32
- Jitter Analysis32
- Math Tools - Standard33
- Automated Measure Tools - Standard33
- Pass/Fail Testing34
- Advanced Math Package (XMATH) - Standard34
- Jitter and Timing Analysis Package (JTA2) - Standard34
- ASDA-J - Standard35
- 8B/10B Protocol Decoding - Standard35
- Advanced Customization Package (XDEV) - Optional35
- Color Waveform Display35
  - Analog Persistence Display36
  - Zoom Expansion Traces36
- Cpu36
- Internal Waveform Memory36
- Setup Storage36
- Interface36
- Auxiliary Output36
- Auxiliary Input36
- General37
  - Environmental Characteristics37
  - Certifications37
  - CE Declaration of Conformity37
- Physical Dimensions38
  - Warranty and Service39
- Optical Reference Receiver (with OE425/OE455)39
- Software Clock Recovery System39
- Communications Mask Testing40
- Jitter Testing40
- Bit Error Rate (Optional)41
Safety42
- Safety Requirements42
  - Safety Symbols42
- Operating Environment43
- Cooling44
- AC Power Source44
- Power Consumption45
- Power and Ground Connections45
- Standby (Power) Switch and Scope Operational States46
- Fuse Replacement46
- Calibration47
- Cleaning47
- Abnormal Conditions47
Basic Controls48
- Alternate Access Methods48
  - Mouse and Keyboard Operation48
  - Toolbar Buttons48
- Trace Descriptors49
- Trace Annotation50
  - Annotating a Waveform51
  - Turning on a Channel Trace Label52
Installation53
- Software53
  - Checking the Scope Status53
- Default Settings53
  - DDA, SDA, and Waverunner Dsos53
- Adding a New Option53
- Restoring Software54
  - Restarting the Application54
  - Restarting the Operating System55
- Removable Hard Drive55
Connecting to a Signal56
- Probus Interface56
- Prolink Interface56
  - Connecting the Adapters58
- AP-1M Hi-Z Adapter59
- Auxiliary Output Signals60
- Auxiliary Output Setup60
Sampling Modes61
- Sampling Mode Selection61
- Single-Shot Sampling Mode61
  - Basic Capture Technique61
- Sequence Sampling Mode Working with Segments62
- RIS SAMPLING Mode - for Higher Sample Rates66
- Roll Mode67
Vertical Settings and Channel Controls67
- Adjusting Sensitivity and Position67
  - Adjusting Sensitivity67
  - Adjusting the Waveform's Position68
- Coupling68
  - Overload Protection68
  - Coupling Setup68
- Probe Attenuation68
  - Setting Probe Attenuation68
- Bandwidth Limit69
- Linear and (Sinx)/X Interpolation69
  - Interpolation Setup69
  - Inverting Waveforms69
- Quickzoom69
  - Turning on a Zoom69
- Finding Scale70
  - Using Find Scale70
- Variable Gain70
  - Enabling Variable Gain70
- Channel Deskew70
  - Channel Deskew Setup70
- Group Delay Compensation71
Timebase and Acquisition System72
- Timebase Setup and Control72
- Autosetup72
- SDA DBI Controls72
- SDA18000 DBI Controls72
- SDA 13000/11000/9000 DBI Controls73
- Smart Memory73
  - SMART Memory Setup74
- External Timebase Vs. External Clock74
Triggering74
- Trigger Setup Considerations74
  - Trigger Modes74
  - Trigger Types75
- Determining Trigger Level, Slope, Source, and Coupling76
- Trigger Source77
- Level77
- Holdoff by Time or Events77
  - Hold off by Time78
  - Hold off by Events79
- Simple Triggers79
- SMART Triggers83
  - Width Trigger83
  - Glitch Trigger84
- Interval Trigger85
- Aux Input Trigger95
  - Aux Input Setup95
Display Formats96
- Display Setup96
  - Sequence Mode Display97
- Persistence Setup97
- Locking of Traces100
- Persistence Setup100
- Screen Saver101
- Moving Traces from Grid to Grid101
- Zooming Waveforms102
- XY Display105
  - XY Display Setup106
Save and Recall106
- Saving and Recalling Scope Settings106
- Saving Screen Images107
- Saving and Recalling Waveforms108
  - Saving Waveforms108
  - Recalling Waveforms110
- Disk Utilities110
Printing and File Management111
- Print, Plot, or Copy111
- Printing111
- Managing Files112
  - Hard Disk Partitions112
100Base-T Ethernet Connection113
- Connecting to a Network113
- Communicating over the Network113
  - Windows Setups113
  - System Restore114
Track Views114
- Creating and Viewing a Trend114
- Creating a Track View115
Histograms116
- Creating and Viewing a Histogram116
- Histogram Parameters119
- Histogram Theory of Operation132
- Histogram Parameters (XMAP and JTA2 Options)134
- Histogram Peaks135
- Binning and Measurement Accuracy135
Waveform Measurements136
- Measuring with Cursors136
  - Cursor Measurement Icons136
- Cursors Setup137
  - Quick Display137
  - Full Setup137
- Overview of Parameters137
- Statistics141
- Applying a Measure Mode141
- Measure Modes141
  - Standard Vertical Parameters141
  - My Measure142
- Parameter Math (Xmath or XMAP Option Required)142
- Measure Gate145
  - Measure Gate Setup146
- Help Markers147
  - Help Marker Setup149
  - Turning off Help Markers149
- Customizing a Parameter149
- Parameter Calculations150
- List of Parameters155
- Qualified Parameters177
  - Range Limited Parameters177
- Waveform Gated Parameters178
  - Waveform Qualifier Setup178
Waveform Math178
- Introduction to Math Traces and Functions178
- Math Made Easy179
  - Setting up a Math Function179
- Resampling to Deskew180
  - Resampling180
- Rescaling and Assigning Units180
- Rescaling Setup182
- Averaging Waveforms182
- Enhanced Resolution184
  - How the Instrument Enhances Resolution184
- Enhanced Resolution (ERES) Setup187
- Waveform Copy187
- Waveform Sparser187
  - Waveform Sparser Setup188
- Interpolation188
  - Interpolation Setup188
- Fast Wave Port188
- Fft195
Analysis204
- Pass/Fail Testing204
- Setting up Pass/Fail Testing206
Utilities210
- Status210
  - Status Dialog Access210
- Remote Communication210
  - Remote Communication Setup210
  - Configuring the Remote Control Assistant Event Log211
- Hardcopy211
- Aux Output212
- Date & Time212
- Options214
- Preferences214
- Acquisition Status216
- Service217
- Show Windows Desktop217
- Touch-Screen Calibration217
Customization218
- Customizing Your Instrument218
  - Introduction218
  - Solutions219
  - Examples219
  - What Is Excel224
  - What Is Mathcad224
  - What Is MATLAB224
  - What Is VBS224
  - What Can You Do with a Customized Instrument226
  - Number of Samples227
- Calling Excel from Your Instrument227
- How to Select a Math Function Call227
- How to Select a Parameter Function Call227
- The Excel Control Dialog228
- Entering a File Name228
- Organizing Excel Spreadsheets229
- Setting the Vertical Scale230
- Trace Descriptors230
- Multiple Inputs and Outputs230
  - Simple Excel Example 1231
  - Simple Excel Example 2234
- Excel Example 1: Exponential Decay Time Constant Excel Parameter238
- Excel Example 2: Gated Parameter Using Excel239
  - How Does this Work241
- Excel Example 3: Correlation Excel Waveform Function242
- Excel Example 4: Multiple Traces on One Grid244
- Excel Example 5: Using a Surface Plot247
- Writing Vbscripts248
  - Types of Scripts in VBS248
  - Loading and Saving Vbscripts248
  - The Default Parameter Function Script: Explanatory Notes251
  - Scripting with Vbscript252
  - Variable Types252
- Variable Names253
- Arithmetic Operators254
- VBS Controls255
  - Summary of if257
  - Select Case258
  - Summary of Select Case258
  - While259
  - For259
- VBS Keywords and Functions260
  - Other VBS Words261
- Functions262
- Hints and Tips for Vbscripting263
- Errors264
- Error Handling266
- Speed of Execution266
- Scripting Ideas267
- Debugging Scripts267
- Horizontal Control Variables268
- Vertical Control Variables268
- List of Variables Available to Scripts268
- Communicating with Excel from a Vbscript269
- Calling MATLAB from the Instrument270
- How to Select a Waveform Function Call271
- The MATLAB Waveform Control Panel272
- MATLAB Waveform Function Editor - Example272
- MATLAB Example Waveform Plot274
- How to Select a MATLAB Parameter Call274
- The MATLAB Parameter Control Panel275
- The MATLAB Parameter Editor275
- MATLAB Example Parameter Panel276
- More Examples of MATLAB Waveform Functions277
- Creating Your Own MATLAB Function280
Customdso281
- What Is Customdso281
- Invoking Customdso281
- Customdso Basic Mode282
- Editing a Customdso Setup File282
- Creating a Customdso Setup File283
- Customdso Plugin Mode284
- Creating a Customdso Plugin284
- Properties of the Control and Its Objects285
- Removing a Plugin288
- Plugin Example 1: Exchanging Two Traces on the Grids289
- Second Example Plugin: Log-Log FFT Plot291
- Control Variables in Customdso293
Labnotebook293
- Introduction to Labnotebook293
- Preferences293
- Recalling Notebook Entries298
- Creating a Report299
- Formatting the Report300
- Managing Notebook Entry Data301
Processing Web Option302
- Using the Web Editor303
Serial Data Analyzer306
- Serial Data Analyzer Standard and Optional Capabilities306
  - SDA Capabilities306
  - SDM Capabilities307
  - ASDA-J Capabilities307
- Jitter Wizard309
- SDA Basic Setup312
- PLL Setup315
- Summary317
- Mask Test317
  - Eye Setup318
  - Mask Margin319
  - Testing320
- Bit Error Rate - ASDA-J Option Only320
- Serial Trigger321
  - Serial Trigger Setup322
  - PLL Locking323
  - Setting the Data Pattern323
  - Storing and Recalling Serial Data Patterns into the Trigger325
  - Using the Serial Pattern Trigger325
- Jitter Setup325
- SDA DBI Controls329
- SDA 13000/11000/9000 DBI Controls329
- Vertical Noise Calibration330
- Running the Script330
- Using Noise Compensation331
- Jitter Measurements332
- Pj Breakdown333
- Alternate Jitter Breakdown Methods (Option ASDA-J Only)333
  - Effective Jitter333
  - MJSQ Jitter335
- Bathtub Curve336
- Jitter Filter337
- TIE Histogram337
- DDJ (Synchronous N-Cycle Plot)338
- Ddj (ISI Plot) - ASDA-J Option Only339
- Edge-To-Edge Basic Setup341
- Edge-Edge Jitter Measurements342
- Edge-Edge Jitter Measurement Controls345
  - Adjust Rj345
  - Async N Cycle Plot345
  - Edge-Edge Spacing Controls345
SDA Function Reference346
- Altncycle347
  - Altncycle Control Summary348
- Htie to BER350
- Jitter Filter Function352
- Slice2Persist353
Multi-Eye Measurements355
- Overview of Multi-Eye Measurement Tools355
- Setup and Installation356
  - Multi-Eye Setup and Installation356
  - Example Setups357
- Front Side Bus (FSB)359
  - Introduction to FSB359
  - FSB Theory of Operation360
- Transition/Non-Transition Eye Diagram363
- Gated (Qualified) Eye Diagram364
SDA Theory365
- Clock Recovery365
- Eye Pattern368
  - Eye Violation Locator (ASDA Option)369
- Eye Pattern Measurements370
- Jitter Measurement373
- Comparing Models382
  - Bit Error Rate383
  - Bit Error Map383
- Vertical Noise Compensation385
- Q-Scale Theory386

LeCroy SDA - Page 126

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