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5-9
Making Measurements
To reduce the random noise on a signal
High-resolution mode (# Avgs=1)
High-resolution mode is an oversampling technique used when the digitizer
sampling rate is faster than the rate at that samples are being stored into
acquisition memory. The sample rate for the 54620-series is 200 MSa/s for
single channel or 100 MSa/s with channel pairs 1 and 2, 3 and 4, or pod 1 and
pod 2 running. The sample rate for the 54640-series is 2 GSa/s for single channel
or 1 GSa/s with channel pairs 1 and 2
For example, if the scope is sampling at 200 MSa/s, yet storing the samples at
1 MSa/s, it needs to store only 1 out of every 200 samples. When high-resolution
mode is used, the slower the sweep speed, the greater the number of samples
that are averaged together for each display point. This tends to reduce random
noise on the input signal, which produces a smoother trace on the screen.
If you cannot acquire multiple triggers, you can still reduce noise and increase
resolution at slower sweep speeds by setting # Avgs to 1.
54620-series
Sweep speed
54640-series
Sweep speed
Bits of resolution
(# Avgs=1)
≤ 2 us/div 200 ns/div 8
5 us/div 1 us/div 9
20 us/div 5 us/div 10
100 us/div 20 us/div 11
500 us/div 100 us/div 12
- 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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