Agilent Technologies 22D Guida Utente Pagina 155
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4-39
MegaZoom Concepts and Oscilloscope Operation
Using Digital Channels to Probe Circuits
High-Frequency Probe Equivalent Circuit
The impedance plots for the two models are shown in these figures. By
comparing the two plots, you can see that both the series tip resistor and the
cable’s characteristic impedance extend the input impedance significantly. The
stray tip capacitance, which is generally small (1 pF), sets the final break point
on the impedance chart.
Impedance versus Frequency for Both Probe Circuit Models
The logic probes are represented by the high-frequency circuit model shown
above. They are designed to provide as much series tip resistance as possible.
Stray tip capacitance to ground is minimized by the proper mechanical design
of the probe tip assembly. This provides the maximum input impedance at high
frequencies.
1 pF
7.5 pF
150
Ω
2
5
0
Ω
100 k
Ω
100 k
Ω
10 k
Ω
1 k
Ω
100
Ω
10
Ω
1
Ω
10 kHz 100 kHz 1 MHz 10 MHz 100 MHz 1 GHz
High
Frequency
Model
Typical
Model
Frequency
Impedance
- Oscilloscopes and 1
- Agilent 54621D/22D/41D/42D 1
- Mixed-Signal Oscilloscopes 1
- In This Book 3
- Contents 5
- 3 Triggering the Oscilloscope 6
- Trigger Types 3-11 6
- MegaZoom Concepts 4-3 7
- 6 Utilities 9
- 7 Performance Characteristics 9
- Contents-6 10
- Getting Started 11
- Setting up the Oscilloscope 14
- To inspect package contents 15
- Table 1-3. Power Cords 20
- To clean the oscilloscope 21
- To adjust the handle 22
- To power-on the oscilloscope 23
- Intensity control 24
- BrightDim 24
- Perfectly compensated 26
- Over compensated 26
- Under compensated 26
- Service Guide for details 30
- To connect a printer 31
- To connect an RS-232 cable 31
- Using Quick Help 35
- Front-Panel Overview 39
- Figure 2-1 45
- Figure 2-2 46
- Figure 2-3 47
- Front-Panel Operation 48
- Interpreting the display 49
- To make a single acquisition 58
- To modify the display grid 62
- To print the display 62
- Triggering the Oscilloscope 63
- Acquisition Memory 65
- Trigger Event 65
- Post-Trigger Buffer 65
- Pre-Trigger Buffer 65
- 1Press the Mode/Coupling key 66
- To select trigger Coupling 68
- To set holdoff 69
- External Trigger Input 71
- Trigger Types 73
- To use Edge triggering 74
- To use Pattern triggering 79
- To use CAN triggering 81
- To use Duration triggering 83
- To use I 86
- C triggering 86
- To use LIN triggering 91
- To use Sequence triggering 93
- Entry knob until 94
- Define the Find: stage 95
- Define the Trigger on: stage 96
- To use SPI triggering 99
- To use TV triggering 104
- 4Press the 105
- Triggering on All Lines 109
- Triggering on Field 1 110
- Triggering on All Fields 111
- To use USB triggering 114
- The Trigger Out connector 116
- Operation 117
- MegaZoom Concepts 119
- Deep Memory 120
- Oscilloscope Responsiveness 121
- Display Update Rate 122
- To setup the Analog channels 123
- ▼. When 129
- ▼) is called post-trigger 129
- Acquisition Modes 133
- ≤ 2 us/div 200 ns/div 8 136
- Display modes 137
- Pan and Zoom 139
- To pan and zoom a waveform 140
- Run/Stop (key is 141
- Run/Stop 141
- Single key 141
- Clear Display in the 141
- Acquiring Data 142
- Memory Depth/Record Length 143
- To take a single trace 144
- To capture a single event 145
- To use infinite persistence 146
- To clear the waveform display 147
- List of stacked 150
- List of channels 151
- Digital channel 151
- TTL 1.4 V 153
- CMOS 2.5 V 153
- ECL –1.3 V 153
- To define a new label 161
- To Autosave traces and setups 165
- To recall traces and setups 168
- softkey 170
- Making Measurements 171
- Capturing Data 173
- To use delayed sweep 174
- ∞ Persist is turned 181
- Signal must 183
- 4Press the Cursors key 184
- To use the XY horizontal mode 186
- Math Functions 187
- Math Scale and Offset 188
- Multiply 189
- Subtract 190
- Differentiate 191
- Integrate 193
- FFT Measurement 195
- Aliasing 196
- FFT Operation 197
- FFT Scale FFT Offset 198
- Return to 198
- softkey to Math 199
- Cursor Measurements 201
- To make cursor measurements 202
- Automatic Measurements 207
- Making automatic measurements 208
- Measurement definitions 212
- Delay Measurement 215
- Source 1 215
- Source 2 215
- Utilities 223
- Language menu 225
- 2Press the 225
- To configure a printer 228
- To use the floppy disk 230
- To set the clock 233
- To set up the screen saver 234
- To perform service functions 236
- To set other options 238
- Performance Characteristics 239
- Characteristics 241
- Horizontal 244
- Trigger System 245
- DECLARATION OF CONFORMITY 265
- ICES/NMB-001 266
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