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Capturing Data 3
Agilent 1000 Series Oscilloscopes User’s Guide 69
So, in practice, an oscilloscope’s sample rate should be four or more times
its bandwidth: f
S
=4f
BW
. This way, there is less aliasing, and aliased
frequency components have a greater amount of attenuation.
See Also Evaluating Oscilloscope Sample Rates vs. Sampling Fidelity: How to
Make the Most Accurate Digital Measurements, Agilent Application Note
1587 (http://cp.literature.agilent.com/litweb/pdf/5989- 5732EN.pdf)
Oscilloscope Rise Time
Closely related to an oscilloscope’s bandwidth specification is its rise time
specification. Oscilloscopes with a Gaussian- type frequency response have
an approximate rise time of 0.35/f
BW
based on a 10% to 90% criterion.
Figure 28 Sample Rate and Oscilloscope Bandwidth
f
S
f
N
f
S
/4
-3dB
Attenuation
Aliased frequency
components
Frequency
Limiting oscilloscope bandwidth (f
BW
) to 1/4 the sample rate (f
S
/4) reduces
frequency components above the Nyquist frequency (f
N
).
0dB
- Agilent 1000 Series 1
- Oscilloscopes 1
- In This Book 4
- Contents 10
- Index 153 12
- Getting Started 17
- Step 4. Input a waveform 21
- Step 5. Use Auto-Scale 22
- Getting Started 1 23
- Step 6. Compensate probes 24
- High Frequency Compensation 25
- DSO1024A 26
- 1Getting Started 30
- Figure 8 Oscilloscope Display 30
- Security loop 33
- Hole for Kensington lock 33
- Displaying Data 35
- Scale knob 36
- Position knob 36
- Slow Scan Mode 38
- Zoomed window 40
- Zoomed window view 40
- X-Y Format 41
- To view the sample rate 42
- Math REF 43
- To adjust the vertical scale 44
- To specify channel coupling 45
- DC Coupling 46
- DC Coupling Status 46
- AC Coupling 46
- AC Coupling Status 46
- To specify a bandwidth limit 47
- Bandwidth limit OFF 47
- 20 MHz Bandwidth 48
- Bandwidth ON Status 48
- To use a digital filter 49
- To invert a waveform 50
- Displaying Data 2 51
- To specify the channel units 52
- Math Scale 53
- FFT Resolution 56
- To save a reference waveform 57
- Changing the Display Settings 59
- To adjust waveform intensity 60
- To clear the display 60
- To set waveform persistence 60
- To change the grid 61
- To adjust the grid brightness 62
- To invert screen colors 62
- To select screen persistence 63
- 2 Displaying Data 64
- Capturing Data 65
- Sampling Theory 66
- Aliasing 66
- Oscilloscope Rise Time 69
- Real-Time Sampling 71
- Memory Depth and Sample Rate 72
- Choosing the Acquisition Mode 73
- To record waveforms 78
- To play-back waveforms 79
- To select the start frame 80
- To select the current frame 80
- To select the end frame 80
- To store recorded waveforms 81
- To load a recording 82
- To import/export recordings 82
- To adjust the trigger level 83
- Trigger level knob 83
- To force a trigger 84
- To set up edge triggers 85
- To set up video triggers 87
- Capturing Data 3 89
- To set up pattern triggers 90
- To set up alternate triggers 91
- To set the trigger sweep 92
- To set the trigger coupling 92
- To specify a trigger holdoff 95
- 3Capturing Data 96
- Making Measurements 97
- Vmax (Maximum Voltage) 100
- Overshoot 102
- Preshoot 102
- Time Measurements 103
- Fall Time 104
- Frequency 104
- Rise Time 104
- Positive Pulse Width 105
- Negative Pulse Width 105
- Positive Duty Cycle 105
- Negative Duty Cycle 105
- Delay Between Rising Edges 106
- Delay Between Falling Edges 106
- Phase Between Rising Edges 107
- Phase Between Falling Edges 107
- Counter (Frequency) 108
- Making Cursor Measurements 109
- Saving and Recalling Data 114
- Using the Disk Manager 118
- To create new folders 119
- To edit folder/file names 120
- To delete folders 121
- To rename folders 121
- To delete files 121
- To recall files 122
- To rename files 122
- To display disk information 122
- USB Device Port 123
- USB Host Port 123
- 1 Press [Print] 126
- Oscilloscope Utility Settings 127
- Displaying System Information 128
- Turning Sound ON or OFF 128
- To enable/disable mask tests 131
- To run/stop a mask test 132
- To set up masks 133
- To save a mask 135
- To recall a mask 135
- To export/import masks 135
- To set up the screen saver 136
- Running Self-Calibration 138
- Overvoltage Category 140
- Pollution Degree 140
- Pollution Degree Definitions 140
- Measurement Category 141
- Specifications 142
- Characteristics 143
- Table 11 Measurement Features 147
- Table 13 Storage 148
- Table 14 I/O 148
- Table 16 Power Requirements 149
- Warnings 151
- Safety Symbols 152
- *54130-97014* 158
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