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Capturing Data 3
Agilent 3000 Series Oscilloscopes User’s Guide 65
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 29 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 3000 Series 1
- Oscilloscopes 1
- In This Book 4
- Contents 10
- Getting Started 17
- Getting Started 1 19
- Figure 1 Package Contents 19
- 1Getting Started 20
- Table 1 Power Cords 20
- Step 4. Input a waveform 23
- Using the Oscilloscope Menus 26
- Figure 5 Oscilloscope Display 28
- Step 7. Use Auto-Scale 29
- Step 8. Compensate probes 31
- High Frequency Compensation 32
- Displaying Data 35
- Using the Horizontal Controls 36
- Displaying Data 2 37
- Slow Scan Mode 38
- Zoomed window 40
- Zoomed window view 40
- X-Y Format 41
- To reset the trigger offset 42
- To specify a trigger holdoff 42
- To view the sample rate 43
- Using the Vertical Controls 44
- To adjust the vertical scale 45
- To specify channel coupling 46
- DC Coupling 47
- DC Coupling Status 47
- AC Coupling 47
- AC Coupling Status 47
- To specify a bandwidth limit 48
- 20 MHz Bandwidth 49
- Bandwidth ON Status 49
- Bandwidth limit OFF 49
- Probe Attenuation 50
- To use a digital filter 51
- To invert a waveform 51
- 2 Displaying Data 52
- Using Math Function Waveforms 53
- FFT Resolution 56
- To save a reference waveform 57
- To change the grid 58
- To use waveform persistence 59
- To clear the display 59
- To invert screen colors 60
- Capturing Data 61
- Sampling Theory 62
- Aliasing 62
- Oscilloscope Rise Time 65
- Memory Depth and Sample Rate 67
- Choosing the Sampling Mode 68
- Choosing the Acquisition Mode 72
- Capturing Data 3 73
- To adjust the trigger level 76
- To force a trigger 77
- To set up edge triggers 78
- To set up video triggers 80
- To set the trigger sweep 82
- To set the trigger coupling 82
- To record waveforms 83
- To play-back waveforms 84
- To store recorded waveforms 86
- Making Measurements 87
- Vpp (Peak-to-Peak Voltage) 90
- Overshoot 92
- Preshoot 92
- Frequency 93
- Rise Time 94
- Fall Time 94
- Positive Pulse Width 95
- Negative Pulse Width 95
- Positive Duty Cycle 95
- Negative Duty Cycle 95
- Delay Between Rising Edges 96
- Delay Between Falling Edges 96
- Counter (Frequency) 96
- Making Measurements 4 97
- Making Cursor Measurements 98
- To save and load waveforms 102
- Supported Printers 110
- Oscilloscope Utility Settings 111
- To enable/disable mask tests 112
- To run/stop a mask test 112
- To set up masks 114
- Setting IO Parameters 115
- Setting the Menu Language 115
- Turning Sound ON or OFF 116
- Displaying System Information 116
- To perform screen tests 117
- To perform key tests 117
- Running Self-Calibration 118
- Specifications 120
- Characteristics 121
- →2 ), Hardware Counter 124
- Table 12 Power Requirements 125
- Table 14 Other 125
- Testing Performance 128
- Before Testing Performance 129
- DC Gain Accuracy Test 130
- Procedure 131
- Specification 136
- Equipment Required 136
- Connections 136
- Service 8 139
- Vpp reading 141
- Performance Test Record 144
- Contacting Agilent 146
- Warnings 147
- To clean the instrument 148
- Safety Symbols 149
- ASafety Notices 150
- *D3000-97017* 156
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