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Digital Channels 13
InfiniiVision Oscilloscopes User’s Guide 383
Digital channel signal fidelity: Probe impedance and grounding
When using the mixed-signal oscilloscope you may encounter problems that are related
to probing. These problems fall into two categories: probe loading and probe grounding.
Probe loading problems generally affect the device under test, while probe grounding
problems affect the accuracy of the data to the measurement instrument. The design of
the probes minimizes the first problem, while the second is easily addressed by good
probing practices.
Input Impedance
The logic probes are passive probes, which offer high input impedance and high
bandwidths. They usually provide some attenuation of the signal to the oscilloscope,
typically 20 dB.
Passive probe input impedance is generally specified in terms of a parallel capacitance
and resistance. The resistance is the sum of the tip resistor value and the input
resistance of the test instrument (see the following figure). The capacitance is the series
combination of the tip compensating capacitor and the cable, plus instrument
capacitance in parallel with the stray tip capacitance to ground. While this results in an
input impedance specification that is an accurate model for DC and low frequencies, the
high-frequency model of the probe input is more useful (see the following figure). This
high-frequency model takes into account pure tip capacitance to ground as well as series
tip resistance, and the cable’s characteristic impedance (Z
o
).
DC
AND LOW-FREQUENCY PROBE EQUIVALENT CIRCUIT
8.5 pF 100 kW
- Agilent InfiniiVision 1
- 5000/6000/7000 1
- Series Oscilloscopes 1
- Book Map 3
- In This User’s Guide… 4
- Contents 10
- To return the instrument 418 20
- Contact us 419 20
- Index 421 20
- Introduction 21
- Models Covered in this Manual 22
- Licensed Options 24
- ALIBRATION OPTION 25
- PGRADE OPTIONS (CONTINUED) 25
- 1 Introduction 26
- Initial Setup 27
- Package Contents 28
- InfiniiVision 5000 Series 29
- Oscilloscope 29
- 2 Initial Setup 30
- 6000A Series Option BAT 31
- Initial Setup 2 33
- Accessories Available 34
- “Active Probes” on page 74 35
- To retract the feet 39
- 5000 Series Overlay 40
- 6000 Series Overlay 41
- 7000 Series Overlay 42
- TOOLS REQUIRED (NOT SUPPLIED) 43
- RACK MOUNT HARDWARE SUPPLIED 43
- Ventilation Requirements 47
- Power Requirements 48
- 50 49
- 5 V RMS 49
- Charging the Battery 51
- Quick Help 55
- Quick Help Languages 56
- Quick Help Updates 56
- To set the clock 57
- To set up the screen saver 58
- Using the Analog Channels 59
- Measurement Hints 61
- Knob softkey 69
- AutoProbe Interface 72
- Passive Probes 73
- Active Probes 74
- Compensating Passive Probes 77
- Calibrating Probes 78
- Digital Probes 80
- Triggering 81
- Trigger Event 83
- Post-Trigger Buffer 83
- Acquisition Memory 83
- Pre-Trigger Buffer 83
- Auto and Normal Trigger modes 84
- Auto Mode 85
- Normal Mode 85
- Trigger Level Adjustment 86
- Trigger Coupling 87
- Trigger Noise Rejection 87
- HF Reject 88
- LF Reject 89
- Noise Rejection 89
- Trigger Holdoff 90
- External Trigger Input 92
- Trigger Output 95
- Trigger Types 96
- CAN Trigger 97
- 4 Triggering 100
- Duration Trigger 101
- Triggering 4 103
- Edge Trigger 104
- FlexRay Trigger 106
- PC Controls the VPT1000 107
- In Asynchronous Mode 110
- In Synchronous Mode 110
- Triggering on FlexRay Frames 111
- C Trigger 120
- S Trigger 126
- "Trigger" value 131
- No trigger 131
- "Armed" value 131
- LIN Trigger 133
- Idle Time 136
- Pattern Trigger 138
- Hex Bus Pattern Trigger 140
- Pulse Width Trigger 141
- Sequence Trigger 144
- Define the “Find” Stage 146
- Define the “Trigger on” Stage 147
- Adjust the Trigger Level 149
- SPI Trigger 151
- TV Trigger 157
- TV Triggering Examples 160
- Alternate Triggering 161
- To trigger on all sync pulses 162
- RIGGERING ON FIELD 1 163
- UART/RS232 Trigger 167
- USB Trigger 171
- Displaying 173
- Tips for Displaying Waveforms 174
- Stabilizing the Display 174
- Interpreting the Display 175
- 5 Displaying 176
- AutoScale 177
- Pan and Zoom 179
- Grid Intensity 181
- Infinite Persistence 182
- Using Labels 183
- Vectors (Connect the Dots) 187
- Freeze Display 188
- Antialiasing 189
- XGA Video Output 189
- Time Measurements 192
- Phase and Delay 192
- Voltage Measurements 192
- Preshoot and Overshoot 192
- Making Automatic Measurements 193
- Measurement Statistics 194
- Source channel 195
- (color coded) 195
- Measurement Thresholds 196
- Measurement Definitions 199
- Duty Cycle 200
- Frequency 200
- Fall Time 201
- Rise Time 201
- X at Max Y 202
- X at Min Y 202
- Delay and Phase Measurements 203
- Source 1 204
- Source 2 204
- Amplitude 206
- Preshoot 210
- Overshoot 211
- Cursor Measurements 213
- Cursor Examples 217
- URSORS TRACK ZOOM SWEEP 218
- XY Horizontal Mode 220
- IGNAL CENTERED ON THE DISPLAY 221
- ARE 90 OUT OF PHASE 223
- SIGNALS ARE IN PHASE 223
- Math Functions 224
- Math scale and offset 225
- Multiply 227
- Add or Subtract 228
- OF SUBTRACT 229
- Differentiate 230
- Integrate 232
- NTEGRATE AND SIGNAL OFFSET 233
- Square Root 234
- OF (SQUARE ROOT) 235
- FFT Measurement 236
- Spectral Leakage 237
- FFT Operation 238
- FFT Measurement Hints 240
- Printing and Saving 243
- Quick Print 244
- 7 Printing and Saving 246
- Saving Oscilloscope Data 247
- Selecting a File Name 249
- Choosing Save Settings 251
- Save Segment 253
- Segmented memory save formats 253
- ECOMMENDED SIGNAL MAPPING 255
- File Explorer 257
- Printing and Saving 7 259
- Acquisition Modes 261
- 8 Acquisition Modes 262
- Acquisition Modes 8 263
- To make a single acquisition 264
- Peak Detect Mode 266
- High Resolution Mode 266
- Averaging Mode 267
- Realtime Sampling Option 269
- Segmented Memory 271
- Re-arm time 273
- Web Interface 275
- To establish a LAN connection 276
- 9 Web Interface 278
- Accessing the Web Interface 279
- Browser Web Control 280
- Remote Programming 282
- &I/O 283
- Get Image 284
- Identification Function 285
- Instrument Utilities 286
- Setting a Password 287
- Serial Decode/Lister 289
- Serial Decode 290
- 10 Serial Decode/Lister 292
- CAN Serial Decode 293
- User Defined 295
- Interpreting CAN Decode 296
- CAN Totalizer 297
- Interpreting CAN Lister Data 299
- FlexRay Serial Decode 300
- FlexRay Totalizer 303
- FlexRay Counters 304
- C Serial Decode 306
- Interpreting I 308
- C Decode 308
- C Lister Data 309
- S Serial Decode 310
- S Decode 312
- S Lister Data 313
- LIN Serial Decode 314
- Interpreting LIN Decode 317
- Interpreting LIN Lister Data 319
- SPI Serial Decode 320
- Interpreting SPI Decode 323
- Interpreting SPI Lister Data 324
- UART/RS232 Serial Decode 325
- UART/RS232 Totalizer 330
- Mask Test 333
- 11 Mask Test 334
- Troubleshooting Mask Setup 335
- Setup Options 336
- Source Lock 337
- Mask Test Trigger Output 338
- Mask Statistics 339
- Reset Statistics 340
- Transparent 340
- Mask File Identifier 341
- Mask Title 341
- Region 1 342
- Region 2 342
- Building a Mask File 344
- Mask Test 11 345
- Controls and Connectors 349
- Front Panel 350
- External 351
- 12 Controls and Connectors 352
- 18. Horizontal Controls 357
- Rear Panel 360
- Controls and Connectors 12 361
- E 365
- JH:G:8DBB:C9:9867A:DCAN 366
- 86A>7G6I>DCJCEGDI:8I:9 366
- 86A>7G6I>DCEGDI:8I:9 366
- Digital Channels 369
- 13 Digital Channels 370
- Circuit 371
- Channel 371
- Pod Ground 371
- Example 374
- Input Impedance 383
- Probe Grounding 385
- Best Probing Practices 386
- Utilities 389
- 14 Utilities 390
- To perform service functions 391
- User Calibration 392
- Self Test 395
- Reference 397
- About Oscilloscope 398
- Software and Firmware Updates 398
- Installed Licenses 398
- Upgrading to an MSO 399
- 15 Reference 400
- Measurement Category 401
- Environmental Conditions 403
- To clean the oscilloscope 406
- Binary Data (.bin) Format 407
- Binary Header Format 408
- Examples of Binary Files 412
- Reference 15 413
- CSV and ASCII XY files 415
- Updating the VPT1000 firmware 416
- Acknowledgements 417
- To return the instrument 418
- Contact us 419
- Numerics 421
- Z-axis blanking, 69, 222 428
- Zoom mode, 66 428
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