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• Waveform Leakage: If the sample rate is too low, the waveform reconstructed

from the sample data does not represent the original signal correctly.

7.4 Memory Depth

Memory depth refers to the number of points that the oscilloscope can store in a

single trigger acquisition. It reflects the storage capability of the acquisition memory.

DHO900 series oscilloscope provides up to 50 Mpts memory depth (standard).

Pre-Sample Delayed Sample

Memory Depth

Trigger Point

Figure 7.3 Memory Depth

The following formula shows the relations among memory depth, sample rate, and

horizontal time base:

Acquisition System

DHO900 User Guide

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Table of Contents3
Safety Requirement17
General Safety Summary17
Safety Notices and Symbols18
Measurement Category19
Ventilation Requirement20
Working Environment20
Care and Cleaning22
Environmental Considerations22
Product Features23
Document Overview24
Quick Start26
General Inspection26
Appearance and Dimensions26
Figure 4.1 Front View26
To Prepare for Use27
To Adjust the Supporting Legs27
Figure 4.2 Side View27
Figure 4.3 Adjusting the Supporting Legs27
To Connect to Power28
Turn-On Checkout28
Figure 4.4 to Connect to Power28
Table 4.1 Power Adaptor Specifications28
To Set the System Language29
To Connect the Probe29
Figure 4.5 Connecting the Passive Probe30
Function Inspection31
Figure 4.6 Connecting the Logic Probe31
Figure 4.7 Using the Compensation Signal32
Figure 4.8 Square Waveform Signal32
Probe Compensation33
Product Overview33
Figure 4.9 Probe Compensation33
Front Panel Overview34
Figure 4.10 Front Panel34
Rear Panel Overview40
Figure 4.11 Rear Panel40
User Interface Overview42
Figure 4.12 User Interface42
Touch Screen Gestures44
Tap44
Drag45
Figure 4.13 Tap Gesture45
Figure 4.14 Drag Gesture45
Pinch&Stretch46
Parameter Setting Method46
Figure 4.15 Pinch&Stretch Gesture46
Figure 4.16 English Input Interface47
Figure 4.17 Chinese Input Interface48
Figure 4.18 String Keypad49
To Use the Security Lock51
Figure 4.19 Numeric Keypad51
To Use the Built-In Help System52
Figure 4.20 to Use the Security Lock52
Vertical System53
To Enable or Disable the Analog Channel53
Figure 5.1 Vertical Menu53
To Adjust the Vertical Scale54
To Adjust the Vertical Offset56
To Specify Channel Coupling57
To Specify Bandwidth Limit57
To Specify Input Impedance58
To Invert a Waveform58
To Set Probe59
Figure 5.2 Waveform Invert On/Off59
Figure 5.3 Probe Setting Menu59
Table 5.1 Probe Ratio60
To Specify the Amplitude Unit61
To Adjust Bias61
To Specify the Skew62
To Turn the Channel Label Display On/Off62
Figure 5.4 Zero Offset62
Horizontal System64
To Adjust the Horizontal Time Base64
Figure 6.1 Horizontal Menu64
To Adjust the Horizontal Position65
Zoom Mode (Delayed Sweep)66
Figure 6.2 Zoom Mode67
Acquisition System68
Acquisition Mode68
Figure 7.1 Horizontal Menu68
Sampling Mode70
Figure 7.2 Display Modes70
Sample Rate71
Memory Depth72
Figure 7.3 Memory Depth72
Horizontal Expansion Reference73
Roll Mode74
XY Mode74
Figure 7.4 XY Menu75
Figure 7.5 Measurement Schematic Diagram of Phase Deviation76
Triggering the Oscilloscope77
Trigger Source77
Trigger Level78
Trigger Mode78
Figure 8.1 Schematic Diagram of the Acquisition Memory79
Trigger Coupling80
Trigger Holdoff80
Noise Rejection81
Trigger Type81
Figure 8.2 Trigger Holdoff81
Edge Trigger82
Figure 8.3 Edge Trigger Setting Menu82
Pulse Width Trigger83
Figure 8.4 Positive/Negative Pulse Width84
Figure 8.5 Pulse Width Trigger Setting Menu84
Slope Trigger86
Figure 8.6 Positive Slope Time/Negative Slope Time86
Figure 8.7 Slope Trigger Setting Menu87
Video Trigger89
Figure 8.8 Video Trigger Setting Menu89
Table 8.1 Video Standard90
Pattern Trigger91
Figure 8.9 Pattern Trigger92
Figure 8.10 Pattern Trigger Setting Menu92
Duration Trigger94
Figure 8.11 Duration Trigger94
Figure 8.12 Duration Trigger Setting Menu95
Timeout Trigger97
Figure 8.13 Timeout Trigger97
Figure 8.14 Timeout Trigger Menu98
Runt Trigger99
Figure 8.15 Runt Trigger99
Figure 8.16 Runt Trigger Setting Menu100
Window Trigger102
Figure 8.17 Window Trigger Setting Menu102
Delay Trigger104
Figure 8.18 Delay Trigger104
Figure 8.19 Delay Trigger Setting Menu104
Setup/Hold Trigger106
Figure 8.20 Setup/Hold Trigger107
Figure 8.21 Setup/Hold Trigger Setting Menu107
Nth Edge Trigger109
Figure 8.22 Nth Edge Trigger109
Figure 8.23 Nth Edge Trigger Setting Menu110
RS232 Trigger111
Figure 8.24 Schematic Diagram of RS232 Protocol111
Figure 8.25 RS232 Trigger Setting Menu112
I2C Trigger114
Figure 8.26 Sequence Diagram of I2C Protocol114
Figure 8.27 I2C Trigger Setting Menu115
Figure 8.28 Binary Format Setting116
Figure 8.29 Hexadecimal Format Setting117
SPI Trigger118
Figure 8.30 Sequential Chart of SPI Bus118
Figure 8.31 SPI Trigger Setting Menu118
CAN Trigger121
Figure 8.32 Data Frame Format of the CAN Bus121
Figure 8.33 CAN Trigger Setting Menu121
Figure 8.34 Sample Position122
LIN Trigger124
Figure 8.35 Data Frame Format of the LIN Bus124
Figure 8.36 LIN Trigger Setting Menu124
Figure 8.37 Sample Position125
Trigger Output Connector127
Math Operation128
Figure 9.1 Math Menu128
Arithmetic Operation129
Figure 9.2 Waveform Display Window of the Operation Results129
Figure 9.3 Arithmetic Operation Menu130
Figure 9.4 Operation Result Display Window130
Function Operation132
Figure 9.5 Function Operation Menu133
Figure 9.6 Operation Result Display Window134
FFT Operation136
Figure 9.7 FFT Operation Menu137
Figure 9.8 FFT Operation Window137
Table 9.1 Window Function139
Figure 9.9 Peak Search140
Logic Operation141
Figure 9.10 Logic Operation Menu141
Table 9.2 Logic Operation142
Figure 9.11 Operation Result Display Window143
Digital Filter144
Figure 9.12 Digital Filter Menu145
Figure 9.13 Operation Result Display Window146
Measurements149
Auto Scale149
Auto Measurements150
Measurement Parameter150
Time Parameters150
Figure 10.1 Time Parameters150
Count Values151
Delay and Phase Parameters153
Figure 10.2 Delay and Phase Parameters153
Voltage Parameters155
Figure 10.3 Voltage Parameters155
Other Parameters156
Select the Measurement Item157
Figure 10.4 Vertical Measurement Items157
Figure 10.5 Horizontal Measurement Items158
Figure 10.6 Other Measurement Items158
Measurement Settings159
Figure 10.7 Measurement Settings Menu159
Remove the Measurement Results162
Cursor Measurements163
Figure 10.8 Cursors163
Manual Mode165
Figure 10.9 Manual Mode Setting Menu165
Track Mode167
Figure 10.10 Manual Cursor Measurement Example167
Figure 10.11 Track Mode Setting Menu168
Figure 10.12 Track Measurement (before Horizontal Expansion)169
XY Mode170
Figure 10.13 Track Measurement (after Horizontal Expansion)170
Figure 10.14 XY Mode Setting Menu170
Digital Voltmeter (DVM) and Frequency Counter172
Digital Voltmeter (DVM)172
Measurement Settings172
Figure 11.1 DVM Setting Menu173
Remove the Measurement174
Frequency Counter174
Measurement Settings175
Figure 11.2 Frequency Counter Setting Menu175
Reset Statistics176
Remove the Measurement176
Digital Channel177
Figure 12.1 la Menu177
To Enable or Disable the Digital Channel178
To Select the Digital Channel178
To Set the Threshold178
To Set the Waveform Size179
To Set the Order179
Probe Calibration179
Label Settings179
Histogram Analysis181
To Enable or Disable the Histogram Function181
Figure 13.1 Histogram Menu181
To Select the Histogram Type182
To Select the Histogram Source182
To Set the Histogram Height182
Figure 13.2 Histogram Analysis Interface182
To Set the Histogram Range183
Histogram Analysis Results183
Figure 13.3 Histogram Analysis Results184
To Remove Results185
To Clear Statistics185
Function/Arbitrary Waveform Generator186
To Output Basic Waveforms186
To Output Sine186
Figure 14.1 AFG Setting Menu186
To Output Square187
To Output Ramp188
To Output Noise188
To Output DC189
To Output the Arbitrary Waveform189
Modulation189
Figure 14.2 Modulation Interface190
Bode Plot (for DHO914S and DHO924S Only)194
Figure 15.1 "Bode Plots" Setting Menu194
Figure 15.2 "Bode Plots" Setting Menu-Simplified Mode194
Basic Setting195
To Enable or Disable the Bode Function195
To Start or Stop the Operation195
To Set the Input Source195
To Set the Output Source196
To Set the Sweep Type196
To Enable or Disable the Filter196
To Set the Display Type196
Figure 15.3 Bode Plot Waveform Display196
Connection Diagram198
Cursor198
Figure 15.4 Bode Plot Chart Display198
Amp/Freq Setting199
Store and Load199
Reference Waveform201
To Enable Ref Function201
To Set the Reference Waveform201
Figure 16.1 Reference Waveform Menu201
To Set the Ref Waveform Display202
Export and Import Operation203
Pass/Fail Test205
Figure 17.1 Passfail Menu205
Figure 17.2 Passfail Menu-Simplified205
To Enable or Disable the Pass/Fail Test Function206
To Select the Source206
To Create a Mask206
To Set the Output Form of the Test Results207
To Start or Stop the Pass/Fail Test Operation208
To Display the Statistics of the Test Results208
Figure 17.3 Pass/Fail Test Interface208
Protocol Decoding210
Parallel Decoding210
Figure 18.1 Schematic Diagram of Parallel Decoding210
Clock Setting (CLK)211
Figure 18.2 Parallel Decoding Menu211
Bus Setting212
Table 18.1 Bus Setting212
Display-Related Settings214
Event Table214
RS232 Decoding215
Figure 18.3 Parallel Decoding Event Table215
Figure 18.4 Schematic Diagram of RS232 Serial Bus215
Figure 18.5 RS232 Decoding Menu216
Source Setting217
To Set Data Package217
Display-Related Settings218
Event Table219
Figure 18.6 RS232 Decoding Event Table219
I2C Decoding220
Source Setting220
Figure 18.7 I2C Serial Bus220
Figure 18.8 I2C Decoding Menu220
Display-Related Settings221
Event Table222
Figure 18.9 I2C Decoding Event Table222
SPI Decoding223
Figure 18.10 SPI Serial Bus223
To Set the Source224
Figure 18.11 SPI Decoding Menu224
To Set Mode and Data225
Display-Related Settings226
Event Table226
LIN Decoding227
Figure 18.12 SPI Decoding Event Table227
Signal Configuration228
Figure 18.13 LIN Decoding Menu228
Display-Related Settings229
Event Table229
Figure 18.14 LIN Decoding Event Table229
CAN Decoding230
Figure 18.15 CAN Decoding Menu230
Signal Configuration231
Display-Related Settings232
Event Table232
Figure 18.16 Sample Position232
Figure 18.17 CAN Decoding Event Table233
Multi-Pane Windowing234
Figure 19.1 "Add Window" Menu234
Waveform Recording and Playing236
Common Settings236
Figure 20.1 "Record" Menu236
Record Options237
Play Options238
Figure 20.2 Minimized "Play" Menu239
Search and Navigation241
Search241
Figure 21.1 Search Menu241
Navigation243
Figure 21.2 Marktable Display243
Figure 21.3 Navigation Menu244
Figure 21.4 Simplified Navigation Menu244
Figure 21.5 "Search Event" Navigation Setting Menu245
Figure 21.6 "Frame Segment" Navigation Setting Menu245
Display Control247
Display Type247
Persistence Time247
Figure 22.1 Display Setting Menu247
Waveform Intensity248
To Set the Screen Grid248
Display Settings248
Show Scale249
Color Grade249
Waveform Freeze249
Store and Load250
To Enter the Storage Menu250
To Save a File250
To Save Image250
Figure 23.1 Image Saving Setting Menu251
To Save Wave252
Figure 23.2 Waveform Saving Setting Menu253
Save Setup254
Figure 23.3 Setup Saving Setting Menu254
Binary Data Format (.Bin)255
Table 23.1 bin File Format255
Table 23.2 File Header256
Table 23.3 Waveform Header256
To Load a File258
Table 23.4 Waveform Data Header258
Firmware Upgrade259
Figure 23.4 Load Setting Menu259
Disk Management260
Figure 23.5 Upgrade Menu260
System Utility Function Setting263
I/O Setting263
Basic Settings265
About this Oscilloscope267
Other Settings268
Auto Config268
Selfcal269
Option List269
Quick Action Settings269
Self-Check272
Remote Control273
Remote Control Via USB274
Remote Control Via LAN274
Troubleshooting276
Appendix277
Appendix A: Options and Accessories277
Appendix B: Warranty277
Appendix C: Factory Settings278
Table 27.2 Factory Settings278

Rigol DHO914 User Manual

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Brand	Rigol
Model	DHO914
Category	Test Equipment
Language	English