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5-10
Making Measurements
To capture glitches or narrow pulses with peak detect and infinite persistence
To capture glitches or narrow pulses with peak detect
and infinite persistence
A glitch is a rapid change in the waveform that is usually narrow as compared
to the waveform. To capture glitches or narrow pulses:
1 Connect a signal to the oscilloscope and obtain a stable display.
2 To find the glitch, press the
Acquire key, then, press the Peak Det softkey.
54620-series Peak detect acquire mode displays any signal pulse wider than
5 ns, allowing you to find glitches and narrow spikes regardless of sweep speed.
Because of MegaZoom memory, peak detect is only necessary at sweep speeds
of 1 ms/div and slower. At faster sweep speeds, Normal acquire mode can
capture the narrow peaks.
At sweep speeds slower than 1 ms/div, the oscilloscope can acquire more
samples than can fit into MegaZoom memory. The oscilloscope selects samples
to store such that no local minimum or maximum wider than 5 ns is missed. In
peak detect mode, narrow glitches and sharp edges are displayed more brightly
than when in Normal acquire mode, making them easier to see.
54640-series Peak detect acquire mode displays any signal pulse wider than
1 ns, allowing you to find glitches and narrow spikes regardless of sweep speed.
Because of MegaZoom memory, peak detect is only necessary at sweep speeds
of 500 µs/div and slower. At faster sweep speeds, Normal acquire mode can
capture the narrow peaks.
At sweep speeds slower than 500 µs/div, the oscilloscope can acquire more
samples than can fit into MegaZoom memory. The oscilloscope selects samples
to store such that no local minimum or maximum wider than 1 ns is missed. In
peak detect mode, narrow glitches and sharp edges are displayed more brightly
than when in Normal acquire mode, making them easier to see.
- 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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