Agilent Technologies DP235 Guide de l'utilisateur Page 425
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425
Troubleshooting the Logic Analyzer
Analyzer Problems
Capacitive loading
Excessive capacitive loading can degrade signals, resulting in incorrect
capture by the analysis probe, or system lockup in the microprocessor.
All analysis probes add additional capacitive loading, as can custom
probe fixtures you design for your application. To reduce loading,
remove as many pin protectors, extenders, and adapters as possible.
Careful layout of your target system can minimize loading problems
and result in better margins for your design. This is especially
important for systems that are running at frequencies greater than 50
MHz.
No trace list display
If there is no trace list display, it may be that your trigger specification
is not correct for the data you want to capture, or that the trace
memory is only partially filled.
❏ Check your trigger specification to ensure that it will capture the events of
interest.
❏ Try stopping the analyzer; if the trace list is partially filled, this should
display the contents of trace memory.
- Agilent Technologies 1670G 1
- Series Logic Analyzers 1
- Logic Analyzer Features 2
- Documentation Options 3
- In This Book 4
- Contents 10
- Logic Analyzer 23
- Logic Analyzer Overview 25
- Analyzer 26
- Shift Key 27
- To make a measurement 29
- Assign pods 30
- Set up analyzers 30
- Set modes and clocks 30
- Group bits under labels 30
- Set up trigger 31
- Define terms 31
- Configure Arming Control 31
- Set up trigger sequence 31
- Run measurement 32
- Select single or repetitive 32
- Gather data 32
- View data 33
- Search for patterns 33
- Correlate data 33
- Make measurements 34
- Connecting Peripherals 35
- To connect a mouse 37
- To connect a keyboard 38
- To connect to an GPIB printer 39
- To connect to a controller 44
- Using the Logic Analyzer 45
- Accessing the Menus 47
- To access the System menus 48
- 3 Select the menu field 49
- To access the Analyzer menus 50
- Using the Analyzer Menus 52
- To create a symbol 55
- To compare two listings 63
- The Inverse Assembler 65
- Using the Trigger Menu 69
- Specifying a Basic Trigger 71
- 2 Select a term 72
- To define a term 74
- Term Selection Pop-up Menu 76
- Changing the Trigger Sequence 77
- To add sequence levels 78
- Sequence Level Pop-up Menu 79
- To change trigger functions 80
- 3 Select Done 82
- To arm another instrument 84
- Managing Memory 89
- (state only) 90
- To set the memory length 91
- With interleaved tags 92
- 5 Select Done 93
- 4 Select Done 94
- Triggering Examples 102
- "F_EXIT" occurs 102
- MEM_SEL 111
- REQ and ACK 116
- To detect bus contention 117
- Cross-Arming Trigger Examples 118
- To detect a glitch 122
- Count Time is set 127
- Special Displays 128
- To interleave trace lists 129
- File Management 133
- To save a configuration 136
- To load a configuration 137
- 5 Select Execute 138
- To save a screen's image 140
- To load additional software 141
- To transfer files using ftp 143
- Using the Oscilloscope 145
- Calibrating the oscilloscope 147
- Self Cal menu calibrations 149
- Oscilloscope Common Menus 152
- Autoscale 154
- Time base 156
- The Scope Channel Menu 157
- Probe field 158
- Coupling field 158
- Preset field 159
- The Scope Display Menu 160
- Accumulate mode 161
- Connect Dots field 162
- Grid field 162
- Display Options field 163
- The Scope Trigger Menu 164
- Edge trigger mode 165
- Immediate trigger mode 166
- Level field 167
- Source field 169
- Slope field 169
- Count field 170
- Auto-Trig field 171
- When field 172
- The Scope Marker Menu 176
- T Marker value display 177
- Set on field 180
- Type field 180
- Occur field 181
- Statistics field 181
- Run Until Time X-O field 182
- Less Than field 182
- Voltage Markers options 185
- Va Volts field 186
- Va to Vb field 186
- Center Screen Field 186
- Channel Label field 187
- The Scope Auto Measure Menu 188
- Top and base voltages 191
- Measurement algorithms 192
- Using the Pattern Generator 195
- To set up the configuration 197
- To build a label 199
- Sequence menu 200
- SEQUENCE START 202
- 2 Select the INST field 205
- To build a user macro 207
- To modify a function name 208
- To edit a function 208
- To enter or modify parameters 211
- To build a User Symbol Table 212
- To store a configuration 215
- To use Autoroll 217
- The Format Menu 218
- Clock Out Delay 220
- Vector Output Mode 220
- The Sequence Menu 222
- INIT and MAIN Sequences 223
- The Step Count Field 224
- Instructions 227
- Data Field 230
- Autoroll 230
- Memory Used 230
- The User Macros Menu 231
- Add/Delete Function 232
- Using Parameters 232
- Loading ASCII Files 233
- ASCII File Commands 234
- <char_count> 236
- Vector Data 237
- FORMat:xxx 239
- Format Specification 241
- Pod Numbering 242
- Logic Analyzer Reference 243
- Oscilloscope option 245
- Pattern generator option 245
- Probing Options 248
- General-Purpose Probing 249
- The Termination Adapter 250
- Probe Tip Assemblies 251
- Probe and Pod Grounding 252
- Probe Leads 252
- Grabbers 253
- Probe Cable 253
- Minimum Signal Amplitude 253
- Maximum Probe Input Voltage 254
- Pod Thresholds 254
- Assembling the probing system 255
- Connecting Probe Tip Assembly 256
- Installing Probe Leads 257
- Connecting Grabbers to Probes 258
- Probe Inputs 259
- Calibration Outputs 259
- (unterminated) 262
- Keyboard Shortcuts 267
- Entering data into a menu 268
- Using the keyboard overlays 269
- Common Menu Fields 270
- Print field 271
- Print Disk 272
- Print All 272
- Print Partial 272
- Run/Stop field 273
- Roll fields 274
- Disk Drive Operations 275
- Disk operation safeguards 277
- Autoload 278
- Load and Store 280
- Default Setup 282
- Controller interface 282
- Printer interface 282
- The GPIB interface 283
- The RS-232-C interface 284
- The Centronics interface 285
- The Ethernet LAN interface 286
- LAN Port 287
- Analyzer IP Address 287
- Gateway IP Address 287
- File Timeout 287
- Analyzer name 287
- Help with 288
- Show LAN Connections 288
- Ethernet Statistics 288
- System Utilities 289
- Update FLASH ROM field 290
- Display Color Selection 292
- The Color Model 293
- Luminosity Fields 294
- Illegal configuration 296
- The Analyzer Format Menu 297
- State acquisition modes 298
- Timing acquisition modes 299
- Acquisition modes 300
- Clock Inputs Display 301
- Pod clock field (State only) 302
- Demultiplex 304
- Clock selections 305
- Setup/Hold field 307
- Symbols field 308
- Base field 309
- Symbol Width field 309
- Symbol name field 309
- Label fields 310
- Label polarity fields 311
- The Analyzer Trigger Menu 312
- Modify Trigger field 313
- Basic Functions 1. Find edge 314
- Modifying the user function 319
- Using storage qualification 320
- Using the Occurrence Counters 321
- Using the timer 321
- Branching 321
- Resource terms 323
- Global timers 1 and 2 324
- Using Preset Values 325
- Assigning Bit by Bit 325
- Combination of terms 326
- Arming Control field 327
- Acquisition Control field 329
- Delay (Timing only) 330
- Count field (State only) 331
- The Listing Menu 332
- Timing analyzer markers 333
- Stop measurement field 333
- Statistics markers 333
- The Waveform Menu 334
- Delay field 335
- Waveform label field 335
- Waveform display 337
- The Mixed Display Menu 338
- Time-correlated displays 339
- The Chart Menu 340
- Min and Max scaling fields 341
- Markers/Range field 341
- Axis Control field 342
- Rescale field 343
- The Compare Menu 344
- Reference Listing field 345
- Difference Listing field 345
- Find Error field 347
- Mask field 348
- Bit Editing field 348
- Software 349
- Operating characteristics 353
- State Overview 353
- State Histogram 354
- Time Interval 354
- Getting started 355
- Default SPA Menu 356
- SPA measurement processes 357
- Selecting and changing labels 358
- State Overview mode 359
- State Overview example 361
- State Histogram mode 362
- State Histogram example 365
- Time Interval mode 366
- Time Interval example 369
- SPA State Overview 370
- SPA State Histogram 371
- SPA Time Interval 372
- Using State Histogram mode 376
- SPA State Histogram Menu 377
- Using Time Interval mode 379
- Specifying an event 379
- SPA Time Interval Menu 380
- Using SPA with other features 383
- Using SPA in Group Runs 384
- Logic Analyzer Concepts 385
- The File System 387
- Directories 388
- File types 389
- Filename endings 390
- The Trigger Sequence 391
- Analyzer resources 395
- Timing analyzer 400
- State analyzer 400
- Logic Analyzers 401
- The Analyzer Hardware 403
- 1670G-series analyzer theory 404
- CPU board 405
- System memory 405
- Keypad and knob interface 405
- GPIB interface 406
- RS-232-C interface 406
- Power supply 406
- LAN Interface 407
- Logic acquisition board 408
- Comparators 409
- Acquisition 410
- Threshold 411
- Oscilloscope board theory 412
- Oscilloscope acquisition 413
- Analog Interface 416
- Loop Register 417
- Output Driver 418
- Clock Circuit 418
- CPU Interface 419
- Self-tests description 420
- Analyzer Problems 423
- Unwanted triggers 424
- Capacitive loading 425
- No trace list display 425
- Analysis Probe Problems 426
- Slow clock 427
- Erratic trace measurements 428
- Inverse Assembler Problems 429
- Error Messages 432
- See Also 436
- Specifications 437
- General Information 438
- Channel count: 442
- ----------------------------= 443
- State analysis 445
- Timing analysis 446
- Triggering 446
- Measurement functions 447
- Indicators 447
- Data entry/display 448
- Marker functions 449
- Auxiliary power 449
- Triggering: 451
- Trigger Modes: 451
- Operating environment 452
- Operator’s Service 453
- Preparing For Use 455
- To inspect the logic analyzer 456
- To apply power 456
- To clean the logic analyzer 457
- To test the logic analyzer 457
- Troubleshooting 458
- To use the flowcharts 459
- Troubleshooting Flowchart 2 460
- To check the power-up tests 461
- To run the self-tests 462
- Repetitive 467
- Repetitive Run 469
- To test the auxiliary power 471
- Section 2 473
- Introducing the LAN Interface 475
- Supported Protocols 477
- LAN section overview 478
- To connect to your network 481
- System External I/O menu 482
- LAN Settings menu 483
- To mount the logic analyzer 486
- System Using the LAN 489
- Control User vs. Data User 490
- Map Network Drive 494
- Using the Mouse and Keyboard 498
- Settings field 499
- To close the interface 504
- To load the custom fonts 505
- Additional Information 508
- PostScript formats 510
- To copy raw measurement data 512
- An example system.txt file: 515
- An example frame.txt file: 516
- An example mount.txt file: 516
- 1 Set up the configuration 517
- Dynamic Configuration Files 517
- To restore configurations 518
- Using the LAN 519
- The Command Parser Socket 520
- LAN Concepts 527
- Analyzer Directory Structure 530
- Dynamic files 532
- Controller Connection 533
- X-Window Box 533
- LAN Settings 533
- Time Zone Field 534
- Assess the problem 537
- Packets routinely lost 538
- Status Number 548
- Network Status Information 551
- Solutions to Common Problems 553
- If your X Window looks odd 555
- 3 Set the file time out 556
- If all else fails 558
- Getting Service Support 559
- Symbol Utility 561
- Symbol Utility Introduction 563
- Supported Symbol File Formats 565
- Format Menu 573
- OMF Symbol Load Menu 574
- To Access the Symbol Browser 575
- OMF symbol as a trigger term 576
- Using the Symbol Utility 577
- To generate a symbol file 578
- To Load a Symbol File 579
- OMF symbols 582
- To Trigger on a Symbol 583
- Loaded into the System 585
- The OMF Symbol File Load Menu 589
- OMF File Field 590
- Drive Field 590
- Label Field 591
- Module Field 591
- Load Field 592
- Current Loaded Files Field 593
- Section Relocation Option 594
- Set Absolute Section Location 595
- Offset This Section 595
- Offset All Sections 595
- The OMF Symbol Browser Menu 596
- Find Field 598
- Question mark wildcard (?) 599
- Browse Results Display 600
- Align to xx Byte Option 601
- Offset Option 602
- Context Display 603
- Address Display 603
- Symbol Mode Field 604
- Creating a GPA Symbol File 606
- GPA File Format 607
- Sections 609
- Functions 611
- Variables 612
- Source Line Numbers 613
- Start Address 614
- Comments 614
- DECLARATION OF CONFORMITY 625
- Product Regulations 626
- EMC Directive 89/336/EEC 626
- ICES/NMB-001 626
- Agilent Technologies 627
- P.O. Box 2197 627
- 1900 Garden of the Gods Road 627
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