Rigol DHO800 Userguide

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Guaranty and Declaration

Trademark Information

RIGOL®is the trademark of RIGOL TECHNOLOGIES CO., LTD.

Notices

• RIGOL products are covered by P.R.C. and foreign patents, issued and pending.

• RIGOL reserves the right to modify or change parts of or all the specifications and pricing

policies at the company's sole decision.

• Information in this publication replaces all previously released materials.

• Information in this publication is subject to change without notice.

• RIGOL shall not be liable for either incidental or consequential losses in connection with the

furnishing, use, or performance of this manual, as well as any information contained.

• Any part of this document is forbidden to be copied, photocopied, or rearranged without prior

written approval of RIGOL.

Product Certification

RIGOL guarantees that this product conforms to the national and industrial standards in China as well as the ISO9001:2015 standard and the ISO14001:2015 standard. Other international standard conformance certifications are in progress.

If you have any problem or requirement when using our products or this manual, please contact RIGOL.

E-mail: service@rigol.com

Website:

http://www.rigol.com

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Section Description Page

List of Figures.............................................................................................................................. VII

List of Tables.................................................................................................................................XII

1 Safety Requirement .........................................................................................................1

1.1 General Safety Summary .................................................................................................................. 1

1.2 Safety Notices and Symbols ............................................................................................................ 3

1.3 Measurement Category .....................................................................................................................3

1.4 Ventilation Requirement ................................................................................................................... 4

1.5 Working Environment ........................................................................................................................4

1.6 Care and Cleaning ...............................................................................................................................6

1.7 Environmental Considerations ........................................................................................................6

2 Product Features .............................................................................................................. 8

3 Document Overview ....................................................................................................... 9

4 Quick Start ........................................................................................................................11

4.1 General Inspection ............................................................................................................................11

4.2 Appearance and Dimensions ........................................................................................................ 11

4.3 To Prepare for Use .............................................................................................................................12

4.3.1 To Adjust the Supporting Legs ........................................................................................12

4.3.2 To Connect to Power ...........................................................................................................13

4.3.3 Turn-on Checkout ................................................................................................................ 13

4.3.4 To Set the System Language ............................................................................................14

4.3.5 To Connect the Probe .........................................................................................................14

4.3.6 Function Inspection .............................................................................................................15

4.3.7 Probe Compensation .......................................................................................................... 16

4.4 Product Overview ..............................................................................................................................17

4.4.1 Front Panel Overview ..........................................................................................................18

4.4.2 Rear Panel Overview ........................................................................................................... 24

4.4.3 User Interface Overview .................................................................................................... 25

4.5 Touch Screen Gestures .................................................................................................................... 27

4.5.1 Tap ............................................................................................................................................. 28

4.5.2 Drag .......................................................................................................................................... 28

4.5.3 Pinch&Stretch ........................................................................................................................29

4.6 Parameter Setting Method ............................................................................................................ 30

4.7 To Use the Security Lock .................................................................................................................35

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4.8 To Use the Built-in Help System ...................................................................................................36

5 Vertical System ............................................................................................................... 37

5.1 To Enable or Disable the Analog Channel ................................................................................ 37

5.2 To Adjust the Vertical Scale ........................................................................................................... 38

5.3 To Adjust the Vertical Offset ..........................................................................................................40

5.4 To Specify Channel Coupling ........................................................................................................ 41

5.5 To Specify Bandwidth Limit ........................................................................................................... 41

5.6 To Specify Input Impedance ..........................................................................................................42

5.7 To Invert a Waveform ...................................................................................................................... 42

5.8 To Set Probe ........................................................................................................................................43

5.9 To Specify the Amplitude Unit ......................................................................................................45

5.10 To Adjust Bias ..................................................................................................................................... 45

5.11 To Specify the Skew ..........................................................................................................................46

5.12 To Turn the Channel Label Display On/Off ...............................................................................46

6 Horizontal System ......................................................................................................... 48

6.1 To Adjust the Horizontal Time Base ........................................................................................... 48

6.2 To Adjust the Horizontal Position ................................................................................................49

6.3 Zoom Mode (Delayed Sweep) ......................................................................................................50

7 Acquisition System ........................................................................................................52

7.1 Acquisition Mode ..............................................................................................................................52

7.2 Sampling Mode ................................................................................................................................. 54

7.3 Sample Rate ........................................................................................................................................ 55

7.4 Memory Depth ...................................................................................................................................56

7.5 Horizontal Expansion Reference ..................................................................................................57

7.6 Roll Mode .............................................................................................................................................58

7.7 XY Mode ...............................................................................................................................................58

8 Triggering the Oscilloscope ....................................................................................... 62

8.1 Trigger Source .................................................................................................................................... 62

8.2 Trigger Level ........................................................................................................................................63

8.3 Trigger Mode ...................................................................................................................................... 63

8.4 Trigger Coupling ................................................................................................................................65

8.5 Trigger Holdoff ...................................................................................................................................65

8.6 Noise Rejection ..................................................................................................................................66

8.7 Trigger Type .........................................................................................................................................66

8.7.1 Edge Trigger ...........................................................................................................................67

8.7.2 Pulse Width Trigger ............................................................................................................. 68

8.7.3 Slope Trigger ..........................................................................................................................71

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8.7.4 Video Trigger ......................................................................................................................... 74

8.7.5 Pattern Trigger .......................................................................................................................76

8.7.6 Duration Trigger ................................................................................................................... 79

8.7.7 Timeout Trigger .................................................................................................................... 82

8.7.8 Runt Trigger ........................................................................................................................... 84

8.7.9 Window Trigger .................................................................................................................... 86

8.7.10 Delay Trigger ..........................................................................................................................88

8.7.11 Setup/Hold Trigger ..............................................................................................................91

8.7.12 Nth Edge Trigger .................................................................................................................. 93

8.7.13 RS232 Trigger ........................................................................................................................ 96

8.7.14 I2C Trigger .............................................................................................................................. 98

8.7.15 SPI Trigger ............................................................................................................................ 102

8.7.16 CAN Trigger ......................................................................................................................... 105

8.8 Trigger Output Connector ........................................................................................................... 108

9 Math Operation ........................................................................................................... 110

9.1 Arithmetic Operation .....................................................................................................................111

9.2 Function Operation ........................................................................................................................114

9.3 FFT Operation .................................................................................................................................. 118

9.4 Logic Operation ...............................................................................................................................123

9.5 Digital Filter ...................................................................................................................................... 126

10 Measurements ..............................................................................................................131

10.1 Auto Scale ......................................................................................................................................... 131

10.2 Auto Measurements ...................................................................................................................... 132

10.2.1 Measurement Parameter .................................................................................................132

10.2.1.1 Time Parameters ................................................................................................ 132

10.2.1.2 Count Values ....................................................................................................... 133

10.2.1.3 Delay and Phase Parameters ......................................................................... 135

10.2.1.4 Voltage Parameters ...........................................................................................137

10.2.1.5 Other Parameters ...............................................................................................138

10.2.2 Select the Measurement Item ....................................................................................... 139

10.2.3 Measurement Settings .....................................................................................................141

10.2.4 Remove the Measurement Results .............................................................................. 144

10.3 Cursor Measurements ...................................................................................................................145

10.3.1 Manual Mode ......................................................................................................................147

10.3.2 Track Mode .......................................................................................................................... 149

10.3.3 XY Mode ............................................................................................................................... 152

11 Digital Voltmeter (DVM) and Frequency Counter ............................................154

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11.1 Digital Voltmeter (DVM) ...............................................................................................................154

11.1.1 Measurement Settings .....................................................................................................154

11.1.2 Remove the Measurement .............................................................................................156

11.2 Frequency Counter .........................................................................................................................156

11.2.1 Measurement Settings .....................................................................................................157

11.2.2 Reset Statistics ....................................................................................................................158

11.2.3 Remove the Measurement .............................................................................................158

12 Histogram Analysis .....................................................................................................159

12.1 To Enable or Disable the Histogram Function ......................................................................159

12.2 To Select the Histogram Type .....................................................................................................160

12.3 To Select the Histogram Source ................................................................................................ 160

12.4 To Set the Histogram Height ......................................................................................................160

12.5 To Set the Histogram Range .......................................................................................................161

12.6 Histogram Analysis Results ......................................................................................................... 161

12.7 To Remove Results ..........................................................................................................................163

12.8 To Clear Statistics ............................................................................................................................163

13 Reference Waveform ..................................................................................................164

13.1 To Enable Ref Function ................................................................................................................. 164

13.2 To Set the Reference Waveform ................................................................................................ 164

13.3 To Set the Ref Waveform Display ..............................................................................................165

13.4 Export and Import Operation .....................................................................................................166

14 Pass/Fail Test ................................................................................................................. 168

14.1 To Enable or Disable the Pass/Fail Test Function ................................................................. 169

14.2 To Select the Source ...................................................................................................................... 169

14.3 To Create a Mask .............................................................................................................................169

14.4 To Set the Output Form of the Test Results ...........................................................................170

14.5 To Start or Stop the Pass/Fail Test Operation ........................................................................171

14.6 To Display the Statistics of the Test Results ........................................................................... 171

15 Protocol Decoding ......................................................................................................173

15.1 Parallel Decoding ............................................................................................................................173

15.1.1 Clock Setting (CLK) ............................................................................................................174

15.1.2 Bus Setting ........................................................................................................................... 175

15.1.3 Display-related Settings .................................................................................................. 176

15.1.4 Event Table ...........................................................................................................................176

15.2 RS232 Decoding ..............................................................................................................................177

15.2.1 Source Setting .....................................................................................................................179

15.2.2 To Set Data Package ......................................................................................................... 180

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15.2.3 Display-related Settings .................................................................................................. 180

15.2.4 Event Table ...........................................................................................................................181

15.3 I2C Decoding ....................................................................................................................................182

15.3.1 Source Setting .....................................................................................................................183

15.3.2 Display-related Settings .................................................................................................. 183

15.3.3 Event Table ...........................................................................................................................184

15.4 SPI Decoding ....................................................................................................................................185

15.4.1 To Set the Source ...............................................................................................................186

15.4.2 To Set Mode and Data ..................................................................................................... 187

15.4.3 Display-related Settings .................................................................................................. 188

15.4.4 Event Table ...........................................................................................................................188

15.5 CAN Decoding .................................................................................................................................189

15.5.1 Signal Configuration .........................................................................................................190

15.5.2 Display-related Settings .................................................................................................. 191

15.5.3 Event Table ...........................................................................................................................192

16 Multi-pane Windowing ............................................................................................. 194

17 Waveform Recording and Playing .........................................................................196

17.1 Common Settings ...........................................................................................................................196

17.2 Record Options ................................................................................................................................197

17.3 Play Options ..................................................................................................................................... 198

18 Search and Navigation .............................................................................................. 201

18.1 Search ................................................................................................................................................. 201

18.2 Navigation .........................................................................................................................................203

19 Display Control .............................................................................................................207

19.1 Display Type ......................................................................................................................................207

19.2 Persistence Time ............................................................................................................................. 207

19.3 Waveform Intensity ........................................................................................................................208

19.4 To Set the Screen Grid ...................................................................................................................208

19.5 Display Settings ...............................................................................................................................208

19.6 Show Scale ........................................................................................................................................ 209

19.7 Color Grade .......................................................................................................................................209

19.8 Waveform Freeze ............................................................................................................................209

20 Store and Load ............................................................................................................. 210

20.1 To Enter the Storage Menu ......................................................................................................... 210

20.2 To Save a File ....................................................................................................................................210

20.2.1 To Save Image .....................................................................................................................210

20.2.2 To Save Wave ...................................................................................................................... 212

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20.2.3 To Save Setup ......................................................................................................................214

20.2.4 Binary Data Format (.bin) ................................................................................................215

20.3 To Load a File ....................................................................................................................................218

20.4 Firmware Upgrade ..........................................................................................................................219

20.5 Disk Management .......................................................................................................................... 220

20.6 SMB Configuration .........................................................................................................................222

21 System Utility Function Setting ..............................................................................227

21.1 I/O Setting .........................................................................................................................................227

21.2 Basic Settings ................................................................................................................................... 229

21.3 About this Oscilloscope ................................................................................................................231

21.4 Other Settings ..................................................................................................................................232

21.5 Auto Config .......................................................................................................................................232

21.6 SelfCal ................................................................................................................................................. 233

21.7 Option List .........................................................................................................................................233

21.8 Quick Action Settings ....................................................................................................................233

21.9 Self-check .......................................................................................................................................... 236

22 Remote Control ............................................................................................................237

22.1 Remote Control via USB ...............................................................................................................238

22.2 Remote Control via LAN ...............................................................................................................238

23 Troubleshooting ...........................................................................................................240

24 Appendix ........................................................................................................................ 241

24.1 Appendix A: Options and Accessories .................................................................................... 241

24.2 Appendix B: Warranty ................................................................................................................... 241

24.3 Appendix C: Factory Settings ..................................................................................................... 242

DHO800 User Guide

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List of Figures

Figure 4.1 Front View ..............................................................................................................11

Figure 4.2 Side View ................................................................................................................12

Figure 4.3 Adjusting the Supporting Legs ......................................................................12

Figure 4.4 To Connect to Power ..........................................................................................13

Figure 4.5 Connecting the Passive Probe ........................................................................15

Figure 4.6 Using the Compensation Signal .................................................................... 16

Figure 4.7 Square Waveform Signal ..................................................................................16

Figure 4.8 Probe Compensation .........................................................................................17

Figure 4.9 Front Panel (2-channel Model) .......................................................................18

Figure 4.10 Front Panel (4-channel Model) .................................................................... 18

Figure 4.11 Rear Panel ............................................................................................................24

Figure 4.12 User Interface .....................................................................................................25

Figure 4.13 Tap Gesture .........................................................................................................28

Figure 4.14 Drag Gesture ......................................................................................................29

Figure 4.15 Pinch&Stretch Gesture ....................................................................................29

Figure 4.16 English Input Interface ....................................................................................30

Figure 4.17 Chinese Input Interface .................................................................................. 32

Figure 4.18 String Keypad .....................................................................................................33

Figure 4.19 Numeric Keypad ................................................................................................34

Figure 4.20 To Use the Security Lock ................................................................................35

Figure 5.1 Vertical Menu ....................................................................................................... 37

Figure 5.2 Waveform Invert On/Off .................................................................................. 43

Figure 5.3 Probe Setting Menu ...........................................................................................43

Figure 5.4 Zero Offset ............................................................................................................ 46

Figure 6.1 Horizontal Menu ................................................................................................. 48

Figure 6.2 Zoom Mode ..........................................................................................................51

Figure 7.1 Horizontal Menu ................................................................................................. 52

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Figure 7.2 Display Modes ......................................................................................................54

Figure 7.3 Memory Depth .................................................................................................... 56

Figure 7.4 XY Menu .................................................................................................................59

Figure 7.5 Measurement Schematic Diagram of Phase Deviation .........................60

Figure 8.1 Schematic Diagram of the Acquisition Memory ......................................64

Figure 8.2 Trigger Holdoff .....................................................................................................66

Figure 8.3 Edge Trigger Setting Menu ..............................................................................67

Figure 8.4 Positive/Negative Pulse Width .......................................................................69

Figure 8.5 Pulse Width Trigger Setting Menu ................................................................69

Figure 8.6 Positive Slope Time/Negative Slope Time ................................................. 71

Figure 8.7 Slope Trigger Setting Menu ............................................................................ 72

Figure 8.8 Video Trigger Setting Menu ............................................................................74

Figure 8.9 Pattern Trigger ..................................................................................................... 77

Figure 8.10 Pattern Trigger Setting Menu .......................................................................77

Figure 8.11 Duration Trigger ................................................................................................79

Figure 8.12 Duration Trigger Setting Menu ....................................................................80

Figure 8.13 Timeout Trigger .................................................................................................82

Figure 8.14 Timeout Trigger Menu ....................................................................................82

Figure 8.15 Runt Trigger ........................................................................................................84

Figure 8.16 Runt Trigger Setting Menu ............................................................................84

Figure 8.17 Window Trigger Setting Menu .....................................................................86

Figure 8.18 Delay Trigger ......................................................................................................88

Figure 8.19 Delay Trigger Setting Menu ..........................................................................89

Figure 8.20 Setup/Hold Trigger .......................................................................................... 91

Figure 8.21 Setup/Hold Trigger Setting Menu ..............................................................92

Figure 8.22 Nth Edge Trigger ...............................................................................................94

Figure 8.23 Nth Edge Trigger Setting Menu .................................................................. 94

Figure 8.24 Schematic Diagram of RS232 Protocol ..................................................... 96

Figure 8.25 RS232 Trigger Setting Menu .........................................................................96

DHO800 User Guide

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Figure 8.26 Sequence Diagram of I2C Protocol ............................................................99

Figure 8.27 I2C Trigger Setting Menu ...............................................................................99

Figure 8.28 Binary Format Setting ...................................................................................101

Figure 8.29 Hexadecimal Format Setting ......................................................................101

Figure 8.30 Sequential Chart of SPI Bus ........................................................................102

Figure 8.31 SPI Trigger Setting Menu ............................................................................ 103

Figure 8.32 Data Frame Format of the CAN Bus ........................................................105

Figure 8.33 CAN Trigger Setting Menu ..........................................................................106

Figure 8.34 Sample Position ..............................................................................................107

Figure 9.1 Math Menu .........................................................................................................110

Figure 9.2 Waveform Display Window of the Operation Results .........................111

Figure 9.3 Arithmetic Operation Menu ..........................................................................112

Figure 9.4 Operation Result Display Window ..............................................................112

Figure 9.5 Function Operation Menu .............................................................................115

Figure 9.6 Operation Result Display Window ..............................................................116

Figure 9.7 FFT Operation Menu ....................................................................................... 119

Figure 9.8 FFT Operation Window .................................................................................. 119

Figure 9.9 Peak Search .........................................................................................................122

Figure 9.10 Logic Operation Menu .................................................................................123

Figure 9.11 Operation Result Display Window ...........................................................125

Figure 9.12 Digital Filter Menu .........................................................................................127

Figure 9.13 Operation Result Display Window ...........................................................128

Figure 10.1 Time Parameters .............................................................................................132

Figure 10.2 Delay and Phase Parameters ......................................................................135

Figure 10.3 Voltage Parameters ....................................................................................... 137

Figure 10.4 Vertical Measurement Items ...................................................................... 139

Figure 10.5 Horizontal Measurement Items ................................................................ 140

Figure 10.6 Other Measurement Items ..........................................................................140

Figure 10.7 Measurement Settings Menu .................................................................... 141

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Figure 10.8 Cursors ...............................................................................................................145

Figure 10.9 Manual Mode Setting Menu ......................................................................147

Figure 10.10 Manual Cursor Measurement Example ................................................149

Figure 10.11 Track Mode Setting Menu ........................................................................150

Figure 10.12 Track Measurement (before Horizontal Expansion) ........................ 151

Figure 10.13 Track Measurement (after Horizontal Expansion) ............................152

Figure 10.14 XY Mode Setting Menu ............................................................................. 152

Figure 11.1 DVM Setting Menu ........................................................................................155

Figure 11.2 Frequency Counter Setting Menu ............................................................157

Figure 12.1 Histogram Menu ............................................................................................ 159

Figure 12.2 Histogram Analysis Interface .....................................................................160

Figure 12.3 Histogram Analysis Results .........................................................................162

Figure 13.1 Reference Waveform Menu ........................................................................164

Figure 14.1 PassFail Menu ..................................................................................................168

Figure 14.2 PassFail Menu-Simplified ............................................................................ 168

Figure 14.3 Pass/Fail Test Interface ................................................................................. 171

Figure 15.1 Schematic Diagram of Parallel Decoding .............................................. 173

Figure 15.2 Parallel Decoding Menu .............................................................................. 174

Figure 15.3 Parallel Decoding Event Table ....................................................................177

Figure 15.4 Schematic Diagram of RS232 Serial Bus ................................................178

Figure 15.5 RS232 Decoding Menu ................................................................................ 178

Figure 15.6 RS232 Decoding Event Table ..................................................................... 181

Figure 15.7 I2C Serial Bus ...................................................................................................182

Figure 15.8 I2C Decoding Menu ...................................................................................... 182

Figure 15.9 I2C Decoding Event Table ........................................................................... 184

Figure 15.10 SPI Serial Bus .................................................................................................185

Figure 15.11 SPI Decoding Menu ....................................................................................186

Figure 15.12 SPI Decoding Event Table ......................................................................... 189

Figure 15.13 CAN Decoding Menu ................................................................................. 190

DHO800 User Guide

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Figure 15.14 Sample Position ............................................................................................191

Figure 15.15 CAN Decoding Event Table ...................................................................... 192

Figure 16.1 "Add Window" Menu ....................................................................................194

Figure 17.1 "Record" Menu ................................................................................................196

Figure 17.2 Minimized "Play" Menu ............................................................................... 199

Figure 18.1 Search Menu ....................................................................................................201

Figure 18.2 MarkTable Display ..........................................................................................203

Figure 18.3 Navigation Menu ........................................................................................... 204

Figure 18.4 Simplified Navigation Menu ...................................................................... 204

Figure 18.5 "Search Event" Navigation Setting Menu ..............................................205

Figure 18.6 "Frame Segment" Navigation Setting Menu ........................................205

Figure 19.1 Display Setting Menu ................................................................................... 207

Figure 20.1 Image Saving Setting Menu .......................................................................211

Figure 20.2 Waveform Saving Setting Menu ...............................................................213

Figure 20.3 Setup Saving Setting Menu ........................................................................214

Figure 20.4 Load Setting Menu ........................................................................................219

Figure 20.5 Upgrade Menu ................................................................................................220

Figure 20.6 Disk Management Interface .......................................................................221

Figure 20.7 SMB Setting Menu .........................................................................................223

Figure 21.1 Self-calibration Menu ................................................................................... 233

Figure 21.2 Quick Menu ......................................................................................................234

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List of Tables

Table 4.1 Power Adaptor Specifications ...........................................................................13

Table 5.1 Probe Ratio ..............................................................................................................44

Table 8.1 Video Standard ...................................................................................................... 75

Table 9.1 Window Function ................................................................................................121

Table 9.2 Logic Operation .................................................................................................. 124

Table 15.1 Bus Setting ..........................................................................................................175

Table 20.1 BIN File Format ................................................................................................. 215

Table 20.2 File Header ..........................................................................................................216

Table 20.3 Waveform Header ............................................................................................216

Table 20.4 Waveform Data Header ................................................................................. 218

Table 24.2 Factory Settings ................................................................................................ 242

DHO800 User Guide

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Safety Requirement

1.1 General Safety Summary

Please review the following safety precautions carefully before putting the instrument into operation so as to avoid any personal injury or damage to the instrument and any product connected to it. To prevent potential hazards, please follow the instructions specified in this manual to use the instrument properly.

• Use Proper Power Cord.

Only the exclusive power cord designed for the instrument and authorized for use within the destination country could be used.

• Ground the Product Properly.

The instrument uses the Type-C power interface. The instrument is not grounded via the power cord. To avoid electric shock, use the ground cable provided in accessories to connect the instrument to the earth ground before connecting any input or output terminals.

• Make Measurements Properly.

This product is a non-isolated oscilloscope. The ground (GND) for each input and output interface is not isolated from the metal chassis or the digital interface grounds (such as USB and HDMI). Do not perform floating measurements without using isolated probes, nor connect any port's GND to a port with a voltage difference relative to earth ground. Otherwise, it may cause damage to this product or other devices (such as the DUT or a computer display) connected to the product and can even cause serious personal injury.

• Connect the Probe Properly.

If a probe is used, the probe ground lead must be connected to earth ground. Do not connect the ground lead to high voltage. Improper way of connection could result in dangerous voltages being present on the connectors, controls or other surfaces of the oscilloscope and probes, which will cause potential hazards for operators.

• Observe All Terminal Ratings.

To avoid fire or shock hazard, observe all ratings and markers on the instrument and check your manual for more information about ratings before connecting the instrument.

• Use Proper Overvoltage Protection.

Ensure that no overvoltage (such as that caused by a bolt of lightning) can reach the product. Otherwise, the operator might be exposed to the danger of an electric shock.

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Safety Requirement

• Do Not Operate Without Covers.

• Do Not Insert Objects into the Air Outlet.

• Avoid Circuit or Wire Exposure.

• Do Not Operate With Suspected Failures.

Do not operate the instrument with covers or panels removed.

Do not insert objects into the air outlet, as doing so may cause damage to the instrument.

Do not touch exposed junctions and components when the instrument is powered on.

If you suspect that any damage may occur to the instrument, have it inspected by RIGOL authorized personnel before further operations. Any maintenance, adjustment or replacement especially to circuits or accessories must be performed by RIGOL authorized personnel.

• Provide Adequate Ventilation.

Inadequate ventilation may cause an increase of temperature in the instrument, which would cause damage to the instrument. So please keep the instrument well ventilated and inspect the air outlet and the fan regularly.

• Do Not Operate in Wet Conditions.

To avoid short circuit inside the instrument or electric shock, never operate the instrument in a humid environment.

• Do Not Operate in an Explosive Atmosphere.

To avoid personal injuries or damage to the instrument, never operate the instrument in an explosive atmosphere.

• Keep Instrument Surfaces Clean and Dry.

To avoid dust or moisture from affecting the performance of the instrument, keep the surfaces of the instrument clean and dry.

• Prevent Electrostatic Impact.

Operate the instrument in an electrostatic discharge protective environment to avoid damage induced by static discharges. Always ground both the internal and external conductors of cables to release static before making connections.

DHO800 User Guide

• Use the Battery Properly.

Do not expose the battery (if available) to high temperature or fire. Keep it out of the reach of children. Improper change of a battery (lithium battery) may cause an explosion. Use the RIGOL specified battery only.

• Handle with Caution.

Please handle with care during transportation to avoid damage to keys, knobs, interfaces, and other parts on the panels.

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WARNING

Equipment meeting Class A requirements may not offer adequate protection to broadcast

services within residential environment.

1.2 Safety Notices and Symbols

Safety Notices in this Manual:

WARNING

Indicates a potentially hazardous situation or practice which, if not avoided, will result in

serious injury or death.

CAUTION

Indicates a potentially hazardous situation or practice which, if not avoided, could result

in damage to the product or loss of important data.

Safety Requirement

Safety Notices on the Product:

• DANGER

It calls attention to an operation, if not correctly performed, could result in injury or hazard immediately.

• WARNING

It calls attention to an operation, if not correctly performed, could result in potential injury or hazard.

• CAUTION

It calls attention to an operation, if not correctly performed, could result in damage to the product or other devices connected to the product.

Safety Symbols on the Product:

Hazardous

Voltage

Safety Warning Protective Earth

Terminal

Chassis Ground Test Ground

1.3 Measurement Category

Measurement Category

This instrument can make measurements in Measurement Category I.

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Safety Requirement

WARNING

This instrument can only be used for measurements within its specified measurement

categories.

Measurement Category Definitions

• Measurement category I is for measurements performed on circuits not directly

• Measurement category II is for measurements performed on circuits directly

• Measurement category III is for measurements performed in the building

connected to MAINS. Examples are measurements on circuits not derived from MAINS, and specially protected (internal) MAINS derived circuits. In the latter case, transient stresses are variable. Thus, you must know the transient withstand capability of the equipment.

connected to low voltage installation. Examples are measurements on household appliances, portable tools and similar equipment.

installation. Examples are measurements on distribution boards, circuit-breakers, wiring (including cables, bus-bars, junction boxes, switches and socket-outlets) in the fixed installation, and equipment for industrial use and some other equipment. For example, stationary motors with permanent connection to a fixed installation.

• Measurement category IV is for measurements performed at the source of a

low-voltage installation. Examples are electricity meters and measurements on primary overcurrent protection devices and ripple control units.

1.4 Ventilation Requirement

This instrument uses a fan to force cooling. Please make sure that the air inlet and outlet areas are free from obstructions and have free air. When using the instrument in a bench-top or rack setting, provide at least 10 cm clearance beside, above and behind the instrument for adequate ventilation.

CAUTION

Inadequate ventilation may cause an increase of temperature in the instrument, which

would cause damage to the instrument. So please keep the instrument well ventilated and

inspect the air outlet and the fan regularly.

1.5 Working Environment

Temperature

DHO800 User Guide

Operating: 0℃ to +50℃

Non-operating: -30℃ to +60℃

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Safety Requirement

Humidity

• Operating:

Below +30℃: ≤90%RH (without condensation)

+30℃ to +40℃: ≤75% RH (without condensation)

+40℃ to +50℃: ≤45%RH (without condensation)

• Non-operating:

Below +60℃: ≤90%RH (without condensation)

WARNING

To avoid short circuit inside the instrument or electric shock, never operate the

instrument in a humid environment.

Altitude

• Operating: below 3 km

• Non-operating: below 15 km

Protection Level Against Electric Shock

ESD ±8kV

Installation (Overvoltage) Category

This product is powered by mains conforming to installation (overvoltage) category II.

WARNING

Ensure that no overvoltage (such as that caused by a bolt of lightning) can reach the

product. Otherwise, the operator might be exposed to the danger of an electric shock.

Installation (Overvoltage) Category Definitions

Installation (overvoltage) category I refers to signal level which is applicable to equipment measurement terminals connected to the source circuit. Among these terminals, precautions are done to limit the transient voltage to a low level.

Installation (overvoltage) category II refers to the local power distribution level which is applicable to equipment connected to the AC line (AC power).

Pollution Degree

Pollution Degree 2

Pollution Degree Definition

• Pollution Degree 1: No pollution or only dry, nonconductive pollution occurs.

The pollution has no effect. For example, a clean room or air-conditioned office environment.

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Safety Requirement

• Pollution Degree 2: Normally only nonconductive pollution occurs. Temporary

conductivity caused by condensation is to be expected. For example, indoor environment.

• Pollution Degree 3: Conductive pollution or dry nonconductive pollution that

becomes conductive due to condensation occurs. To be found in industrial environment or construction sites (harsh environments). For example, sheltered outdoor environment.

• Pollution Degree 4: The pollution generates persistent conductivity caused by

conductive dust, rain, or snow. For example, outdoor areas.

Safety Class

Class 2

1.6 Care and Cleaning

Care

Do not store or leave the instrument where it may be exposed to direct sunlight for long periods of time.

Cleaning

Clean the instrument regularly according to its operating conditions.

1. Disconnect the instrument from all power sources.

2. Clean the external surfaces of the instrument with a soft cloth dampened with mild

detergent or water. Avoid having any water or other objects into the chassis via the heat dissipation hole. When cleaning the LCD, take care to avoid scarifying it.

CAUTION

To avoid damage to the instrument, do not expose it to caustic liquids.

WARNING

To avoid short-circuit resulting from moisture or personal injuries, ensure that the

instrument is completely dry before connecting it to the power supply.

1.7 Environmental Considerations

The following symbol indicates that this product complies with the WEEE Directive 2012/19/EU.

DHO800 User Guide

Page 21

Safety Requirement

The equipment may contain substances that could be harmful to the environment or human health. To avoid the release of such substances into the environment and avoid harm to human health, we recommend you to recycle this product appropriately to ensure that most materials are reused or recycled properly. Please contact your local authorities for disposal or recycling information.

You can click on the following link

https://int.rigol.com/services/services/declaration

to download the latest version of the RoHS&WEEE certification file.

Page 22

Product Features

• Ultra-low noise floor, purer signal, never miss the small signals

• Up to 12 bits resolution for all the models of this series

• Max. analog bandwidth of 100 MHz, 4 analog channels, external trigger output

(std.) available for the dual-channel model

• Max. real-time sample rate of 1.25 GSa/s

• Max. memory depth of 25 Mpts

• Vertical sensitivity range: 500 μV/div to 10 V/div

• Max. capture rate of 1,000,000 wfms/s (in UltraAcquire mode)

• Digital phosphor display with real-time 256-level intensity grading

• Waveform search and navigation function allows you to debug the signal

anomalies faster

• 7" (1024x600) capacitive multi-touch screen

• Brand new Flex Knob brings user-friendly experience

• USB Device & Host, LAN, and HDMI interfaces (std.) for all the models of this

series

• Novel and delicate industrial design, easy to operate

• Unique online upgrade

The DHO800 series is RIGOL's new launched high-performance economical digital oscilloscope. Though compact in design, it has superior performance. It features a capture rate up to 1,000,000 wfms/s (in UltraAcquire Mode), 25 Mpts memory depth, 12 bit resolution, and low noise.

The DHO800 series is a brand new economical digital oscilloscope designed for the vast mainstream digital oscilloscope market to meet their design, debugging, and test demands.

DHO800 User Guide

Page 23

Document Overview

This manual gives you a quick overview of the front and rear panel, user interface as well as basic operation methods of DHO800 series.

TIP

For the latest version of this manual, download it from RIGOL official website (

www.rigol.com

Publication Number

UGA36105-1110

Software Version

00.01.03

Software upgrade might change or add product features. Please acquire the latest version of the manual from RIGOL website or contact RIGOL to upgrade the software.

Format Conventions in this Manual

http://

1. Key

The front panel key is denoted by the menu key icon. For example, indicates the "Default" key.

2. Menu

The menu item is denoted by the format of "Menu Name (Bold) + Character Shading" in the manual. For example, the "Utility" function menu. You can click or tap Setup to access the "Setup" menu.

3. Operation Procedures

The next step of the operation is denoted by ">" in the manual. For example,

> Storage indicates first clicking or tapping and then clicking or tapping Storage.

4. Connector

The front/rear panel connector is denoted by "Brackets + Connector Name (Bold)", for example, [AUX OUT].

Setup indicates the "Setup" sub-menu under

5. Knob

Label Knob Label Knob

Horizontal POSITION

Horizontal Position Knob

Multipurpose Knob 1

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Document Overview

Label Knob Label Knob

Horizontal SCALE

Vertical POSITION

Vertical SCALE

Horizontal Scale Knob

Vertical Position Knob

Vertical Scale Knob

LEVEL

- -

Multipurpose Knob 2

Trigger Level Knob

Content Conventions in this Manual

DHO800 series digital oscilloscope includes the following models. Four-channel models and two-channel models share the same operation method. Unless otherwise specified, this manual takes the four-channel model DHO814 as an example to illustrate the operation methods of DHO800 series oscilloscope.

Model Max. Analog Bandwidth No. of Analog Channels

DHO802 70 MHz 2+EXT

DHO804 70 MHz 4

DHO812 100 MHz 2+EXT

DHO814 100 MHz 4

DHO800 User Guide

Page 25

Quick Start

4.1 General Inspection

1. Inspect the packaging

If the packaging has been damaged, do not dispose the damaged packaging or cushioning materials until the shipment has been checked for completeness and has passed both electrical and mechanical tests.

The consigner or carrier shall be liable for the damage to the instrument resulting from shipment. RIGOL would not be responsible for free maintenance/rework or replacement of the instrument.

2. Inspect the instrument

In case of any mechanical damage, missing parts, or failure in passing the electrical and mechanical tests, contact your RIGOL sales representative.

3. Check the accessories

Please check the accessories according to the packing lists. If the accessories are damaged or incomplete, please contact your RIGOL sales representative.

Recommended Calibration Interval

RIGOL suggests that the instrument should be calibrated every 18 months.

4.2 Appearance and Dimensions

265.36 mm

161.75 mm

Figure 4.1 Front View

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Quick Start

77.38 mm

Figure 4.2 Side View

4.3 To Prepare for Use

4.3.1 To Adjust the Supporting Legs

Adjust the supporting legs properly to use them as stands to tilt the oscilloscope upwards for stable placement of the oscilloscope as well as better operation and observation. You can also fold the supporting legs when the instrument is not in use for easier storage or shipment, as shown in the figure below.

DHO800 User Guide

Supporting Legs

（a）Unfold the supporting legs

Figure 4.3 Adjusting the Supporting Legs

（b）Fold the supporting legs

Page 27

4.3.2 To Connect to Power

The power requirements of the oscilloscope are DC, 15 V, 3 A. Please use the power adaptor provided in the accessories to connect the oscilloscope to the AC power source (100 V to 240 V, 50 Hz to 60 Hz), as shown in the figure below.

Quick Start

Power Cord Connector

Figure 4.4 To Connect to Power

Table 4.1 Power Adaptor Specifications

Item Description

Input 100 V to 240 V, 50 Hz to 60 Hz, 1.2 A Max

Output DC, 15 V, 3 A, 45 W

CAUTION

The power adaptor provided in accessories can only be used to power RIGOL instruments.

Do not use it for mobile phone and other devices.

WARNING

To avoid electric shock, use the ground cable provided in the accessories to ground the

instrument properly.

4.3.3 Turn-on Checkout

After the instrument is connected to the power source, press the power key at the lower-left corner of the front panel to power on the instrument. During the start-up

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Quick Start

process, the instrument performs a series of self-tests. After the self-test, the splash screen is displayed.

• Restart: Click or tap > Power > Restart to restart the instrument.

• Shutdown:

- Click or tap > Power > Shutdown to shut down the instrument.

- Press and then click or tap Shutdown in the displayed "Power" menu to

shut down the instrument.

- Press twice to shut down the instrument.

- Press for three seconds to shut down the instrument.

• Sleep: Click or tap > Power > Sleep to enter sleep mode. In sleep mode,

not all processes are closed, resulting in slightly higher power consumption compared to shutdown mode. However, the instrument can start up more

quickly and resume its previous state before sleep. When in sleep mode, press to start the instrument.

TIP

You can also click or tap > Utility > Setup and set the "Power status" to "Switch On". The

instrument powers on once connected to power.

4.3.4 To Set the System Language

This oscilloscope supports multiple languages. You can click or tap > Utility > Setup > Language to select the system language.

4.3.5 To Connect the Probe

DHO800 User Guide

RIGOL provides passive probes for DHO800 series. For specific probe models, refer to

DHO800 Data Sheet.

the corresponding Probe User Guide.

Connect the Passive Probe

1. Connect the BNC terminal of the probe to an analog channel input terminal of the

oscilloscope on the front panel as shown in the figure below.

2. Connect the ground alligator clip or spring of the probe to the circuit ground

terminal, and then connect the probe tip to the circuit point to be tested.

For detailed technical information of the probes, please refer to

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Quick Start

Figure 4.5 Connecting the Passive Probe

After you connect the passive probe, check the probe function and probe compensation adjustment before making measurements. For details, please refer to

Function Inspection

and

Probe Compensation

4.3.6 Function Inspection

1. Press the front-panel and a prompt message "Restore default settings?"

is displayed. Click or tap OK to restore the instrument to its factory default settings.

2. Connect the ground alligator clip of the probe to the "Ground Terminal" as shown

Figure 4.6

3. Use the probe to connect the input terminal of CH1 and the "Compensation Signal

Output Terminal" of the probe, as shown in

Figure 4.6

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Quick Start

Compensation Signal

Output Terminal

Ground Terminal

Figure 4.6 Using the Compensation Signal

4. Set the probe ratio based on the attenuation of the probe, and then click or tap

> Auto.

5. Observe the waveform on the display. In normal condition, you should see a

square waveform similar to the waveform shown in the figure below.

Figure 4.7 Square Waveform Signal

6. Test the other channels in the same way. If you see the waveform, but the square

wave is not shaped correctly as shown above, perform the procedure described in

Probe Compensation

. If you do not see the waveform, perform those steps again.

WARNING

To avoid electric shock when using the probe, please make sure that the insulated wire of

the probe is in good condition. Do not touch the metallic part of the probe when the

probe is connected to high voltage source.

4.3.7 Probe Compensation

When used for the first time, the oscilloscope probe must be compensated to match the input characteristics of the oscilloscope channel to which it is connected. The

DHO800 User Guide

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Quick Start

non-compensated or poorly compensated probe may cause measurement errors. The compensation procedure is as follows:

1. Perform Step 1, 2, 3 and 4 in Function Inspection.

2. Check the displayed waveforms and compare them with the waveforms shown in

Figure 4.8

Over compensated Under compensatedPerfectly compensated

3. Use the probe compensation adjustment tool provided in the accessories to adjust

the low-frequency compensation adjustment hole on the probe until the displayed

waveform is consistent with the "Perfectly compensated" waveform shown in the

above figure.

4.4 Product Overview

Unless otherwise specified, this chapter takes the four-channel model DHO814 as an example to introduce the appearance and dimensions, front and rear panels, and user interface of the DHO800 series oscilloscope.

Figure 4.8 Probe Compensation

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Quick Start

4.4.1 Front Panel Overview

Figure 4.9 Front Panel (2-channel Model)

7 8

Figure 4.10 Front Panel (4-channel Model)

7 8

DHO800 User Guide

Page 33

1. 7'' Capacitive Touch Screen

Displays the waveforms, menu labels, and parameter settings, system state, prompt messages, and other information.

2. Multipurpose Knobs

Quick Start

- Non-menu operation:

When not operating on the menu, you can rotate the knob 1 to adjust the waveform brightness. When a cursor, decoding, Math waveform, or reference waveform is added on the screen, you can rotate the multipurpose knob to move the cursor (knob 1 and 2), adjust the decode threshold (knob 1) and decode result display position (knob 2), adjust the vertical scale (knob 1) and vertical offset (knob 2) of the math/reference waveform. You can click or tap

Flex Knob on the Toolbar at the upper-right of the screen to set priority.

- Automatic: Cursor > Math/Ref/Decode > Intensity (default priority).

- Manual: all non-menu operation items are listed at the lower part of the Flex Knob menu. You can select one of them as the current item for multipurpose

knob to adjust.

- Menu operation:

When operating on the menu, you can rotate the multipurpose knob 1/2 to adjust the value in the menu. When you click or tap an input field and then the

/ icon is displayed in the input field, it indicates that you can use multipurpose knob 1/2 to set the value. The LED indicator of the corresponding knob is illuminated. At this point, you can rotate the knob to adjust the value or press the knob to restore the parameter to the default value.

When using the virtual numeric keypad or drop-down list, you can rotate the knob to navigate through the keypad or drop-down list and press the knob to select an item.

3. Analyse Key

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Quick Start

Press to access the Analyse menu. In this menu, you can access analysis features including digital voltmeter (DVM), counter, power analysis, waveform recording, and pass/fail.

4. Measure Key

Press to access the Measure menu. You can select the waveform parameters in the menu. For details, refer to

Select the Measurement Item

5. Cursor Key

Press to enable cursor measurements. The results are displayed in the rightside "Result" bar. Three cursor modes are available: Manual, Track, and XY; wherein, the XY mode is available only when the XY function is enabled.

6. Common Tools Keys

- is the auto scale key. Press this key to enable the auto scale function.

The oscilloscope is automatically configured to best display the input signals by adjusting the vertical scale, horizontal timebase, and trigger mode. To set up the key, please refer to

Auto Config

- is the RUN/STOP key. Press the key to set the oscilloscope's run state to

"RUN" or "STOP". In "RUN" state, this key is illuminated in green; in "STOP" state, this key is illuminated in red.

is the key for a single acquisition. Press this key to set the oscilloscope's

trigger mode to "Single".

is the default setup key. Press this key twice to directly restore the oscilloscope's default settings. You can also press the key and a dialog box is displayed. Click or tap

OK in the dialog to restore the oscilloscope's default

settings.

is the clear key. Press this key to clear all waveform on the display. If

the oscilloscope is in "RUN" mode, it continues to display new waveforms.

DHO800 User Guide

7. Touch Lock Key

Page 35

is the touch lock key. Press this key once to disable the touch screen

function; press it again to enable the touch screen.

8. Quick Action Key

Quick Start

Press

to perform the selected quick action: print screen, save wave, save setup, measure all, statistics reset, waveform record, or save group. To set up the key, please refer to

Quick Action Settings

9. Trigger Controls

- is the trigger setup key. Press this key to access the Trigger

menu. For details, please refer to

Triggering the Oscilloscope

- is the trigger slope setup key. Press this key to select the

edge type (rising edge, falling edge, or either edge). This key is not active when the trigger type is not set to "Edge".

is the force trigger key. Press this key to force a trigger.

- LEVEL is the trigger level/digital threshold knob. Turn the

knob clockwise to increase the trigger level or turn the knob counterclockwise to decrease the level. Pressing the knob can quickly set the trigger level to the waveform's 50% peak-to-peak value.

10. Horizontal Controls

- Horizontal

POSITION is the horizontal position knob.

Turn the knob to change the horizontal position (trigger position) to move the waveforms horizontally. Press the knob to reset the horizontal position to default.

- Horizontal SCALE is the horizontal scale knob. Turn the

knob to change the horizontal time/div setting to compress or expand waveforms of all channels horizontally. Press this knob to toggle between fine and coarse adjustment for horizontal time base or enable/disable the Zoom mode (related to

Fine/Zoom

)

- is the horizontal menu key. Press this key to access

the Horizontal menu in which you can set the horizontal system and acquisition system.

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Quick Start

- is the Navigate key. Press this key to access the

Navigation menu. You can navigate time, search events, or segments. For details, please refer to

Navigation

11.

Vertical Controls

are the navigation keys. You can use the keys to navigate time, search events, or segments. You can also use the keys to play recorded waveforms.

- is the Math key. Press this key to access the Math menu. Math

operations include A+B, A-B, A×B, A/B, FFT, etc. You can also set the Math label.

is the reference key. Press this key to assess the Ref menu, in which you can add reference waveforms in waveform view and compare them with measured waveforms to identify circuit fault.

- Vertical

POSITION is the vertical position knob. Turn this knob to change

the selected waveform's vertical position to move the waveform up or down on the display. Press this knob to reset the vertical position to zero.

- Vertical

SCALE is the vertical scale knob. Rotate this knob to modify the

value of vertical divisions of the graticule in volts/div to increase or decrease the display amplitude of the waveform. Press this knob to toggle between fine and coarse adjustment of the vertical scale.

/ / / is the channel key. Depending on the actual situation, press the key to enable (display), select, or disable the corresponding channel, as described below:

DHO800 User Guide

- If the channel is not displayed, you can press the channel key to open the

channel in the waveform view window.

Page 37

- If the channel is displayed but not selected, you can press the channel key to

select the channel.

- If the channel is both displayed and selected, you can press the channel key

to close its display in the waveform view.

NOTE

As DHO802/DHO812 is a two-channel model, it only provides two channel keys (

and ).

12. Probe Compensation Signal Output Terminal/Ground Terminal

This terminal outputs the probe compensation signal which helps you match a probe's input capacitance to the oscilloscope channel to which it is connected.

13. External Trigger Input Terminal (for DHO812 and DHO802 only)

BNC connector to input external trigger signal.

Quick Start

14.

Analog Channel Input Terminals

BNC connectors. Attach probes to these connectors for analog signal inputs.

NOTE

As DHO802/DHO812 is a two-channel model, it only provides two analog input terminals.

15. USB HOST Port

This series supports USB storage device of FAT32/NTFS format and mouse.

- USB storage device: imports or exports data (software update, waveform,

setup, or captured image).

- Mouse: connects a mouse to control the instrument.

16. Power Key

Powers on/off the oscilloscope.

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Quick Start

4.4.2 Rear Panel Overview

Figure 4.11 Rear Panel

1. AUX OUT

- Trigger output:

After the AUX output is set to "TrigOut", the oscilloscope generates a trigger and outputs a signal that can reflect the current capture rate of the oscilloscope via this interface. Connect the signal to a waveform display device and measure the frequency of the signal. The measurement result is the same as the current capture rate.

4 5

DHO800 User Guide

- Pass/Fail:

After the AUX output is set to "PassFail", in the pass/fail test, the instrument will output a pulse via the [AUX OUT] connector when a passed or failed waveform is detected during the pass/fail test.

2. LAN

Connect the instrument to network via this interface. The instrument conforms to the standards specified in LXI Device Specification 2011. Its test system can be built quickly. Then you can control the instrument through using Web Control to send the SCPI commands. When update is available, you can perform online upgrading for the system software of the instrument via the LAN interface.

3. USB DEVICE

Connect the instrument to the PC via this interface. Then you can use the PC software to send the SCPI commands or use the user-defined programming to control the instrument.

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Quick Start

4. HDMI

You can connect the instrument to an external display that has the HDMI interface (e.g. monitor or projector) via this interface to better observe the waveform display clearly. At this time, you can also view the waveforms on the LCD of the instrument.

5. USB Type-C Power Connector

6. Security Lock Hole

Use a standard PC/laptop lock cable to secure the oscilloscope to a work bench or other location.

7. Ground Terminal

Connect the instrument chassis to the ground using the lead.

8. Mounting Screws

Interval of screw holes: 100 mm x 100 mm. Use screws to secure the oscilloscope to the bracket with the same screw hole interval.

4.4.3 User Interface Overview

4 5

Figure 4.12 User Interface

Page 40

Quick Start

1. Waveform View

Displays the measurement waveform window for CH1-CH4. Click or tap at the

upper-right corner of the window to close the window; click or tap to enter the configuration menu of the specified function.

2. Run State Label

Displays the operating status of the instrument. Possibles states include RUN, STOP, T'D, WAIT, and AUTO.

3. Horizontal Timebase Label

Displays the current horizontal time base. Click or tap this label to enter the horizontal setting menu.

4. Sample Rate & Memory Depth Label

Displays the current sample rate and memory depth. Click or tap this label to enter the horizontal setting menu.

5. Horizontal Position Label

Displays the current horizontal position. Click or tap this label to enter the horizontal setting menu.

6. Trigger Label

- Displays the trigger information of the system, including the trigger type,

trigger level, trigger mode, and etc.

- Click or tap the trigger label, then the trigger setting window is displayed. You

can set the parameters for the trigger.

7. Function Toolbar

Provides

STOP/RUN, Default, Measure, Flex Knob, Windows, Cursors, Math, XY,

Storage, Counter, DVM, Decode, Record, and Navigate keys.

8. Result Sidebar

Displays the measurement results and statistics of various functions. Click or tap

10. Notification Area

DHO800 User Guide

at the lower-right corner of the screen to open or close the "Result" sidebar.

9. Split-screen Display

If you enable multiple functions, multiple windows can be displayed on the screen at one time.

Displays USB icon, LAN icon, sound icon, and remote control icon. You can click or tap this area to open the "Utility" menu.

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Quick Start

- USB storage device icon: When a USB storage device is detected, will be

displayed.

- LAN icon: When the LAN interface is successfully connected,

- Sound icon: In the "Utility" menu, click or tap Setup > Beeper to enable or

disable the sound. When on, will be displayed; when off, will be displayed. You can simply click or tap the icon to enable or disable the sound.

- Remote control icon: When you use Web Control to control the instrument

remotely, will be displayed.

11. Math Labels

- Displays the on/off states of Math1-Math4.

- Click or tap

vertical scale for Math1-Math4.

12.

Channel Labels

- Display the channel on/off status.

- Display the channel coupling mode.

M1-M4 labels to display the on/off state, operation type, and

is displayed.

- Display the vertical scale.

- Display the vertical offset.

- Click or tap the label to enable/disable the corresponding channel or open the

Vertical menu.

NOTE

As DHO802/DHO812 is a two-channel model, it only provides two channel labels.

13. Function Navigation Icon

Click or tap the icon to open the function navigation menu in which you can access the specified function menu by clicking or tapping the corresponding function key.

4.5 Touch Screen Gestures

The instrument provides a super large capacitive touch screen, which is convenient for users to operate and make configurations. It has strong waveform display capacity and excellent user experience. It features great convenience, high flexibility, and great

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Quick Start

sensitivity. The actions supported by the touch screen controls include tapping, pinching&stretching, and dragging.

4.5.1 Tap

Use one finger to tap the symbol or characters on the screen slightly, as shown in

Figure 4.13

• Tap the menu displayed on the screen to operate on the menu.

• Tap the function navigation icon at the lower-left corner of the touch screen to

• Tap the displayed numeric keypad to set the parameters.

• Tap the virtual keypad to set the label name and the filename.

. With the Tap gesture, you can perform the following operations:

enable the function navigation.

• Tap the close button at the upper-right corner of the message box to close the

prompt window.

• Tap other windows on the touch screen and operate on the windows.

4.5.2 Drag

Figure 4.13 Tap Gesture

DHO800 User Guide

Use one finger to select the object, and then drag the object to a destination place, as shown in the figure below. With the drag gesture, you can perform the following operation:

• Drag the waveform to change its position or scale.

• Drag the window controls to change the position of the window (e.g. numeric

keypad).

• Drag the cursor to move the cursor.

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Quick Start

• Drag the trigger cursor to change the trigger level.

• In multi-window display, drag one of the displayed windows to change its

position on the display.

Figure 4.14 Drag Gesture

4.5.3 Pinch&Stretch

Pinch or stretch two points on the screen with two fingers to zoom in or out the waveform. To zoom in the waveform, first pinch the two fingers and then stretch the fingers; to zoom out the waveform, first stretch the two fingers, and then pinch the fingers together, as shown in the figure below. With the pinch&stretch gesture, you can perform the following operation:

• Pinching&stretching in the horizontal direction can adjust the horizontal time

base of the waveform.

• Pinching&stretching in the vertical direction can adjust the vertical scale of the

waveform.

Figure 4.15 Pinch&Stretch Gesture

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Quick Start

4.6 Parameter Setting Method

For this instrument, you can use the knob and touch screen to set parameters. The common parameter setting methods are as follows:

• Method 1: Some parameters can be adjusted by rotating the knob on the front

panel.

• Method 2: Click or tap the input field of a specified parameter, then a virtual

keypad is displayed. Complete the parameter setting with the keypad.

Input Chinese and English Characters

When naming a label, this instrument supports Chinese/English input method. The following part introduces how to input Chinese and English characters with the Chinese/English input method.

• Input English Characters

Uppercase/Lowercase Switchover Name Input Area Virtual Keypad

Input Method

Switchover

Switch to Numbers

And Symbols

Figure 4.16 English Input Interface

Backspace Key

Confirm InputSpace Key

DHO800 User Guide

1. Select English input method

First check the input method type. If it shows "En/中", then go to Step 2; if it shows "中/En", click or tap the input method switchover key to switch to "En/ 中" (English input method).

2. Clear the name input area

If there is no character in the "Name Input Area", please go to the next step. If there are characters in the "Name Input Area", click or tap the Backspace key to delete all the characters from the "Name Input Area" in order.

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Quick Start

3. Input the upper-case letter

If you want to input an upper-case letter, first use the Caps key to switch between the upper-case and lower-case mode. If the Caps key is selected, input the upper-case letter with the virtual keypad. If not, first click or tap the Caps key to ensure it is selected, then input the upper-case letter. All the input letters will be displayed in the "Name Input Area".

4. Input the lower-case letter

Refer to the operation specified in the previous step. If the Caps key is not selected, directly input the lower-case letter.

5. Input numbers or symbols

If the letter keypad is displayed, you need to click or tap the numeric switchover key to switch to the numeric keypad, and input numbers or symbols with the numeric keypad. All the input letters will be displayed in the "Name Input Area".

Modify or delete the unwanted characters that have been input

During the name input process, you can modify or delete the unwanted character if necessary. To delete the characters that have been input, click or tap the Backspace key in the virtual keypad to delete the characters. To modify the characters that have been input, delete the unwanted characters first and then input the new characters.

You can directly move the cursor to the character to be modified or deleted, delete the desired character or input the new characters after deleting the unwanted character.

7. Confirm the input

After completing the input operation, click or tap "OK".

• Input Chinese Characters

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Quick Start

Figure 4.17 Chinese Input Interface

1. Select Chinese input method

Pinyin Input Area

Chinese Character

Selection Area

First check the input method type. If it shows "中/En", then go to Step 2; if it shows "En/中", click or tap the input method switchover key to switch to "中/En" (Chinese input method).

2. Clear the name input area

If there are characters in the "Pinyin Input Area", when you delete characters from the name input area, the characters in the Pinyin input area will be deleted first.

3. Input Chinese characters

Click or tap the characters in the virtual keypad to input Pinyin into the input area, then the characters to be selected will be displayed in the Chinese character selection area. Slide to view more Chinese characters for you to choose. Select the desired Chinese character, and then the selected character will be displayed in the input area.

4. Modify or delete the unwanted characters that have been input

DHO800 User Guide

5. Confirm the input

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Quick Start

After completing the input operation, click or tap "OK".

Input a String

When naming a file or folder, you need to input a string with the string keypad.

Uppercase/Lowercase Switchover Name Input Area Virtual Keypad

Figure 4.18 String Keypad

Backspace Key

Confirm InputSpace KeySwitch to Numbers and Symbols

1. Clear the name input area

2. Input the upper-case letter

If you want to input an upper-case letter, first use the Caps key to switch between the upper-case and lower-case mode. If the Caps key is selected, input the uppercase letter with the virtual keypad. If not, first click or tap the Caps key to ensure it is selected, then input the upper-case letter. All the input letters will be displayed in the "Name Input Area".

3. Input the lower-case letter

Refer to the operation specified in the previous step. If the Caps key is not selected, directly input the lower-case letter.

4. Input numbers or symbols

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Quick Start

5. Modify or delete the unwanted characters that have been input

You can directly move the cursor to the character to be modified or deleted, delete the desired character or input the new characters after deleting the unwanted character.

6. Confirm the input

After completing the input operation, click or tap "OK".

Input a Value

When setting or modifying a parameter, input an appropriate value with the numeric keypad.

• Click or tap the value or unit in the numeric keypad to complete the input.

• Rotate the multipurpose knob (1/2) to move the cursor to select the desired

value and unit. Press the knob to confirm the input.

Cursor

UnitTen to the Nth Power Confirmation Key

Delete Key

Max. Value

Min. Value

Default Key

Clear Key

DHO800 User Guide

Figure 4.19 Numeric Keypad

After you input all the values and select the desired units, the numeric keypad is turned off automatically. This indicates that you have completed parameter setting. Besides, after you have input the values, you can also click or tap "OK" directly to close the numeric keypad. At this time, the unit of the parameter is the default unit. In the numeric keypad, you can perform the following operations:

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• Modify the parameter value that has been input;

• Set the parameter value to a maximum or minimum value;

• Set the parameter to a default value;

• Clear the parameter input field.

4.7 To Use the Security Lock

If necessary, you can lock the instrument to a fixed location by using the security lock (please purchase it by yourself), as shown in the figure below.

The method is as follows: align the lock with the lock hole and plug it into the lock hole vertically, turn the key clockwise to lock the oscilloscope, and then pull the key out.

Quick Start

Security Lock Hole

Figure 4.20 To Use the Security Lock

CAUTION

Please do not insert other objects into the security lock hole to avoid damaging the

instrument.

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Quick Start

4.8 To Use the Built-in Help System

The built-in help file provides information about the functions and menu

introductions of the instrument. Click or tap > Help to enter the help system.

In the help system, you can get its help information by clicking on or tapping the link for the specified chapter.

DHO800 User Guide

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Vertical System

This series oscilloscope provides 2 analog input channels (CH1-CH2) for DHO802 and DHO812 and 4 analog input channels (CH1-CH4) for DHO804 and DHO814, and each channel is equipped with an independent vertical control system. The setting methods for their vertical systems are the same. This chapter takes CH1 of the fourchannel model as an example to introduce the setting method for the vertical system.

When a channel is selected, click or tap the channel status label at the bottom of the screen. Then the menu as shown in the figure below is displayed.

Figure 5.1 Vertical Menu

5.1 To Enable or Disable the Analog Channel

Enable the Analog Channel

When a signal is connected to CH1, you can enable the channel in the following ways.

• Click or tap the channel status label at the bottom of the screen to enable the

channel.

• Press the front-panel

key is illuminated.

• In

When CH1 is activated, its status label at the bottom of the screen is as shown in the figure below.

Figure 5.1

CH1 on or off.

, select the CH1 tab. Click or tap the Display on/off switch to turn

key to enable the channel, and the backlight of this

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Vertical System

The information displayed in the channel status label is related to the current channel setting (irrelevant with the on/off status of the channel). After the channel is turned on, modify the parameters such as the vertical scale, horizontal time base, trigger mode, and trigger level according to the input signal for easy observation and measurement of the waveform.

When CH1 is enabled but not activated, its status label is as shown in the following figure.

Click or tap the channel status label at the bottom of the screen or press the front-

panel activate it.

Disable the Analog Channel

You can disable the analog channel in the following ways.

• If CH1 has been enabled and activated, you can press the front-panel

to disable it directly. You can also click or tap the channel status label at the bottom of the screen to open the Vertical menu and then click or tap the label again to disable the channel.

• If CH1 has been enabled but not activated, first activate the channel. Then press

the front-panel

• In

• In addition, you can slide down the channel label to disable the channel.

key to activate CH1. You can also select the CH1 tab in Vertical menu to

key or use the channel status label to disable CH1.

Figure 5.1

, set Display to OFF to disable CH1.

key

If CH1 is disabled, its status label is as shown in the figure below.

5.2 To Adjust the Vertical Scale

Vertical scale indicates the voltage value per grid in the vertical axis of the screen. It is often expressed in V/div. Adjusting the vertical scale increases or decreases the

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Vertical System

display amplitude of the waveform. The scale information of the channel status label at the bottom of the screen would change accordingly.

Vertical

Scale

The adjustable range of the vertical scale is related to the current probe ratio. By default, the probe ratio is 1X. In this case, the adjustable range of the vertical scale is from 500 μV/div to 10 V/div.

When CH1 is turned on and activated, you can adjust the vertical scale in the following ways.

• Rotate the Vertical

SCALE knob to adjust the vertical scale (clockwise to

reduce the scale and counterclockwise to increase).

• Enable the touch screen function, and then adjust the vertical scale with the

pinch & stretch gesture on the touch screen. For details, refer to descriptions in

Pinch&Stretch

• In the

Vertical menu, click or tap the icon at the right side of the input field of

Scale to increase or decrease the scale value or use the corresponding multipurpose knob on the front panel to set the value. You can also click or tap the input field to input a specific value with the displayed numeric keypad.

Input Field

Increase

Decrease

In the Vertical menu, click or tap the Fine on/off switch to toggle between ON (fine adjustment) and OFF (coarse adjustment). The default setting is OFF. You can also

press the Vertical

SCALE knob to toggle between "coarse adjustment" and "fine

adjustment".

• Fine adjustment: Use the icons at the right side of Scale or rotate the knob to

further adjust the vertical scale within a relatively smaller range to improve vertical resolution. If the amplitude of the input waveform is a little bit greater than the full scale under the current scale and the amplitude would be a little bit

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Vertical System

lower if the next scale is used, fine adjustment can be used to improve the amplitude of waveform display to view signal details.

• Coarse adjustment: Use the icons at the right side of Scale or rotate the knob to

adjust the vertical scale in a 1-2-5 step sequence, i.e. 500 μV/div, 1 mV/div, 2 mV/div, 5 mV/div, 10 mV/div...10 V/div.

5.3 To Adjust the Vertical Offset

Vertical offset indicates the offset of the signal ground level position of the waveform from the vertical center of the display. Its unit is consistent with the currently selected amplitude unit (refer to moves the corresponding channel's waveform up and down. The vertical offset information (as shown in the following figure) in the channel status label at the bottom of the screen will change accordingly.

To Specify the Amplitude Unit

). Adjusting the vertical offset

Vertical

Offset

The adjustable range of the vertical offset is related to the current probe ratio and vertical scale.

When CH1 is turned on and activated, you can adjust the vertical offset in the following ways.

• Rotate the Vertical

adjust the vertical offset within the adjustable range. Rotate this knob clockwise to increase the vertical offset, and rotate it counterclockwise to reduce the vertical offset. Pressing down the knob can quickly reset the vertical offset (set the vertical offset to 0).

• Enable the touch screen function, and then adjust the vertical offset with the

drag gesture. For details, refer to

• In the Vertical menu, click or tap the Up/Down arrow icon at the right side of the

input field of corresponding multipurpose knob to set the value. You can also click or tap the input field to input a specific value with the pop-up numeric keypad.

Offset to increase or decrease the offset value or use the

POSITION knob at the right section of the front panel to

Drag

DHO800 User Guide

Input Field

Decrease

Increase

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5.4 To Specify Channel Coupling

You can remove unwanted signals by setting the coupling mode. For example, the signal under test is a square waveform with DC offset.

Click or tap the channel status label at the bottom of the screen, and then the Vertical menu is displayed. Click or tap the Coupling drop-down button to select the coupling mode.

• When the coupling mode is "DC", both the DC and AC components of the signal

under test can pass the channel.

• When the coupling mode is "AC", the DC components of the signal under test

are blocked.

Vertical System

• When the coupling mode is "GND", the DC and AC components of the signal

under test are blocked.

After a coupling mode is selected, it is indicated in the channel status label at the bottom of the screen, as shown in the figure below.

5.5 To Specify Bandwidth Limit

This oscilloscope supports the bandwidth limit function. Setting the bandwidth limit can reduce the noises in the displayed waveforms. For example, the signal under test is a pulse with high frequency oscillation.

• When the bandwidth limit is turned off, the high frequency components of the

signal under test can pass the channel.

GND

• When the bandwidth limit is turned on, the high frequency components found in

the signal under test that are greater than the limit are attenuated. This series supports 20 MHz bandwidth limit.

Click or tap the channel status label at the bottom of the screen, and then the Vertical menu is displayed. Click or tap the BW Limit drop-down button to select the specified bandwidth. When the bandwidth limit is enabled, the specific bandwidth

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Vertical System

limit value will be displayed in the channel status label at the bottom of the screen, as shown in the figure below.

TIP

Bandwidth limit can not only reduce the noise, but also can attenuate or eliminate the high

frequency components of the signal.

5.6 To Specify Input Impedance

This series oscilloscope provides 1 MΩ input impedance mode. In this mode, the input impedance of the oscilloscope is very high, and the current flowed from the circuit under test can be ignored.

5.7 To Invert a Waveform

Click or tap the channel status label at the bottom of the screen, and then the Vertical menu is displayed. Then click or tap the Invert on/off switch to enable or disable the waveform invert function.

When "ON" is selected, the channel label is as shown in the figure below.

When the Invert function is disabled, the waveform is displayed normally; when enabled, the voltage values of the displayed waveform are inverted, as shown in the figure below. Inverting a waveform also changes the result of math function, waveform measurement, etc.

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Vertical System

"Invert" Off

"Invert" On

Figure 5.2 Waveform Invert On/Off

TIP

When the Invert function is turned on, the trigger (e.g. Edge trigger, Pulse trigger, or Slope

trigger) edge or polarity will be changed.

5.8 To Set Probe

The analog channel of this oscilloscope supports passive probes. For detailed technical information of the probes, please refer to the corresponding Probe User Guide.

Click or tap the channel status label at the bottom of the screen. Then the Vertical menu is displayed. Then click or tap in the figure below.

Probe to enter the Probe setting menu, as shown

Figure 5.3 Probe Setting Menu

Probe Ratio

The oscilloscope allows you to set the probe attenuation manually. To obtain the accurate measurement results, you must set the probe ratio properly. By default, the probe ratio is 1X.

The probe ratio values available are as shown in the following table.

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Vertical System

Table 5.1 Probe Ratio

Attenuation

0.001X

0.002X

0.005X

0.01X

0.02X

0.05X

0.1X

0.2X

0.5X

1X (default)

(display amplitude of the signal: actual amplitude of the signal)

0.001:1

0.002:1

0.005:1

0.01:1

0.02:1

0.05:1

0.1:1

0.2:1

0.5:1

1:1

2:1

5:1

10X

15X

20X

50X

100X

150X

200X

500X

1000X

1500X

2000X

5000X

10000X

15000X

10:1

15:1

20:1

50:1

100:1

150:1

200:1

500:1

1000:1

1500:1

2000:1

5000:1

10000:1

15000:1

DHO800 User Guide

20000X

20000:1

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Attenuation

Vertical System

50000X 50000:1

Go Back to the Vertical Menu

In the

Probe setting menu, click or tap Vertical to go back to the Vertical menu.

(display amplitude of the signal: actual amplitude of the signal)

5.9 To Specify the Amplitude Unit

Click or tap the channel status label at the bottom of the screen, and then the Vertical menu is displayed. Click or tap the Unit drop-down button to select W, A, V, or U. The default unit is V.

Changing the amplitude unit also changes the units of the functions related to the channel accordingly.

5.10 To Adjust Bias

When you use an oscilloscope to make actual measurements, a small offset that arises from the temperature drift of the component or external environment disturbance may occur on the zero-cross voltage of the channel, which will affect the measurement results of the vertical parameters. This series oscilloscope allows you to set an offset calibration voltage for calibrating the zero point of the corresponding channel so as to improve the accuracy of the measurement results.

In the "Vertical" menu, click or tap the Up/Down arrow icon at the right side of the input field of field to set the value with the pop-up numeric keypad. You can also use the corresponding multipurpose knob to set the value.

Value Input Area

The range of bias is related to the vertical scale.

Bias to increase or decrease the bias value. You can click or tap the input

Decrease Increase

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Vertical System

TIP

If the zero-cross voltage of the channel has a larger amplitude offset that exceeds the

adjustable range, please perform self-calibration for the instrument to ensure the

measurement accuracy. For details, refer to

5.11 To Specify the Skew

When using an oscilloscope for actual measurement, the transmission delay of the probe cable may bring relatively greater errors (zero offset). This series oscilloscope allows you to set a delay time for calibrating the zero offset of the corresponding channel. Zero offset is defined as the offset of the crossing point of the waveform and trigger level line relative to trigger position, as shown in the figure below.

SelfCal

Zero Offset

Figure 5.4 Zero Offset

In the "Vertical" menu, click or tap the Ch-Ch Skew input field to set the channel-tochannel skew time. The available range is from -100 ns to 100 ns, and the default is

0.00 s.

5.12 To Turn the Channel Label Display On/Off

The instrument uses the channel number to mark the corresponding channel by

default. For ease of use, you can also set a label for each channel. For example,

Click or tap the channel status label at the bottom of the screen. Then the Vertical menu is displayed. Click or tap the Label on/off switch to turn the label display on or off. You can also click or tap the label input field to input a specific name for the channel label with the pop-up keypad.

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Vertical System

For how to use the keypad, refer to descriptions in

Parameter Setting Method

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Horizontal System

You can access the Horizontal menu in the following ways.

• Click or tap the channel status label at the bottom of the screen, and then the Vertical menu is displayed. Click or tap the Acquisition button to enter the Horizontal menu.

• Click or tap the horizontal time base label ("H" icon), acquisition label ("A" icon),

or horizontal position label ("D" icon) at the top of the screen to enter the Horizontal menu.

Horizontal Time Base

• Press the front-panel key to enter the Horizontal menu.

Sample Rate Horizontal Position

Figure 6.1 Horizontal Menu

6.1 To Adjust the Horizontal Time Base

Horizontal time base, also called the horizontal scale, refers to the time of each grid in the horizontal direction of the screen. It is usually expressed in s/div. The range of the horizontal time base is from 5.00 ns/div to 500 s/div.

While you change the horizontal time base, the displayed waveforms of all channels are expanded or compressed horizontally relative to the selected time reference

DHO800 User Guide

Horizontal Expansion Reference

( base label ("H" icon) will change accordingly, as shown in the figure below.

). The horizontal time base in the horizontal time

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Horizontal System

You can adjust the horizontal time base in the following ways.

• Rotate the front-panel Horizontal SCALE knob to adjust the horizontal time base (clockwise to decrease the scale and counterclockwise to increase).

• Enable the touch screen function, and then adjust the horizontal time base with the Pinch&Stretch gesture. For details, refer to

Pinch&Stretch

• In the Scale to increase or decrease the horizontal time base or use the corresponding

multipurpose knob to set the value. You can also click or tap the input field to input a specific value with the pop-up numeric keypad.

In the Horizontal menu, click or tap the Vernier on/off switch to toggle between ON (fine adjustment) and OFF (coarse adjustment). You can also press the front-panel

Horizontal SCALE knob to toggle between "coarse adjustment" and "fine adjustment".

• Coarse adjustment: Click or tap the icons at the right side of the input field of Scale to adjust the horizontal time base of the waveforms of all channels in a

1-2-5 step sequence within the adjustable range.

• Fine adjustment: Click or tap the icon at the right side of the input field of Scale to adjust the horizontal time base of the waveforms of all channels at a smaller step within the adjustable range.

Horizontal menu, click or tap the icon at the right side of the input field of

Input Field

Increase

Decrease

6.2 To Adjust the Horizontal Position

Horizontal position, also called trigger position, refers to the trigger point position of the waveforms of all channels in the horizontal direction relative to the center of the display. When the waveform trigger point is at the left (right) side of the center, the horizontal position is a positive (negative) value.

Changing the horizontal position moves the waveform trigger points and the displayed waveforms of all channels horizontally. The horizontal position displayed in the horizontal position label ("D" icon) changes accordingly, as shown in the figure below.

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Horizontal System

You can adjust the horizontal position in the following ways.

• Rotate the Horizontal

POSITION knob at the right section of the front panel

to adjust the horizontal position within the adjustable range. Rotate this knob clockwise to reduce the horizontal position or counterclockwise to increase the horizontal position. Pressing the knob can quickly reset the horizontal position (set the horizontal position to 0).

• Enable the touch screen function, and then adjust the horizontal position with

Drag

the drag gesture. For details, refer to

• In the "Horizontal" menu, use the corresponding multipurpose knob to set the horizontal position or use the icons at the right side of the input field of Position to increase or decrease the value, as shown in the figure below. You can also click or tap the

Position input field to input a specific value with the pop-up numeric

keypad.

Input Field

Increase

Decrease

6.3 Zoom Mode (Delayed Sweep)

Zoom (delayed sweep mode) can be used to horizontally expand a length of waveform to view waveform details. In the Horizontal menu, click or tap the Zoom on/off switch to enable or disable the delayed sweep function. When it is enabled, you can set the scale and position in Zoom mode.

Input Field for

Zoomed Time Base

• Zoomed Scale: Rotate the corresponding multipurpose knob or use the icons at the right side of the the Zoom window. You can also click or tap the input field to input the specific value directly via the pop-up numeric keypad.

• Zoomed Position: Rotate the corresponding multipurpose knob or use the icons at the right side of the Position input field to increase or decrease the position

Increase

Scale input field to increase or decrease the time base for

Input Field for

Zoomed Position

Increase

DecreaseDecrease

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Horizontal System

for the Zoom window. You can also click or tap the input field to input the specific value directly via the pop-up numeric keypad.

When the Zoom mode is enabled, the display divides in half, as shown in the figure below.

Main Time Base

Zoomed Time Base

Waveform before Expansion

Waveform after Expansion

Zoomed Position

Figure 6.2 Zoom Mode

• Waveform before expansion:

The upper portion of the display that is not covered by subtransparent gray shows the normal display of the waveform. Its horizontal time base (called the main time base) is indicated in the label at the upper-left corner of the display. You can move the area left and right by adjusting the horizontal position and increase or decrease the size of the area by adjusting the horizontal scale.

• Waveform after expansion:

The lower portion shows the horizontally expanded version of the normal waveform display. Its horizontal time base (called the zoomed time base) is displayed in the middle. Compared with the main time base, the zoomed time base has higher resolution.

TIP

The zoomed time base should be smaller than or equal to the main time base.

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Acquisition System

The "Horizontal" menu allows you to configure the instrument's acquisition system.

Figure 7.1 Horizontal Menu

7.1 Acquisition Mode

The acquisition mode is used to determine how the waveform points are calculated from the sample points. In the Horizontal menu, click or tap the desired acquisition mode for the Acquisition item. This oscilloscope provides four acquisition modes: Normal (default), Average, Peak, and UltraAcquire. The selected acquisition mode is indicated in the acquisition label ("A" icon) at the top of the screen

Acquisition

Mode

Normal

In Normal acquisition mode, the oscilloscope samples the signal at a fixed time interval to rebuild the waveform. This mode produces the best display for most waveforms.

Average

In this mode, the oscilloscope averages the waveforms from multiple acquisitions to reduce the random noise of the input signal and increase the vertical resolution. A greater number of averages lowers the noise and increases the vertical resolution. On the other hand, the higher the number of averages, the slower the response of the displayed waveform to waveform changes.

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Acquisition System

When you select "Average" mode, click or tap the Averages input field to set the number of averages with the pop-up numeric keypad or use the corresponding multipurpose knob to set the value. Its range is from 2 to 65536, and the default is 2.

NOTE

The number of averages must be the Nth power of 2. When it is not in N power-of-2

increments, a prompt message "Truncation average error" is displayed. At this time, a value

that is smaller than the one you input and the closest to N power-of-2 increments will be input

automatically.

Peak

In this mode, the oscilloscope acquires the maximum and minimum values of the signal within the acquisition interval to get the signal envelope or capture narrow pulses that might be lost. This mode prevents signal aliasing at the expense of exaggerating the noise.

In this mode, the minimum pulse width detected is the sample period.

UltraAcquire

UltraAcquire mode is one of the fast acquisition modes. It divides the oscilloscope's memory into segments and fills a memory segment for each individual trigger event. It provides a much higher waveform capture rate and helps minimize the dead time between trigger events.

When you select "UltraAcquire" mode, click or tap the set the number of frames and the

Timeout input field to set the timeout. When the

Display Frame input field to

number of the frames reaches the maximum or the sampling time reaches the timeout, the oscilloscope stops sampling and plots the waveform. Click or tap the

Display mode drop-down button to select the display mode of the acquired data.

• Adjacent: Waveform segments are shown in an adjacent way with each segment

shown next to the previous segment in time order. A maximum of 100 frames can be displayed on the screen at a time in this mode.

• Overlay: All the captured waveform segments are overwritten to display as one single segment of the waveform. A maximum of 100 frames can be displayed on the screen at a time in this mode.

• Waterfall: It displays the captured waveform segments in a cascaded display order. A maximum of 100 frames can be displayed on the screen at a time in this mode.

• Perspective: The waveform segments are displayed in the ladder-like form, with each segment being arranged above another with a certain perspective (angle), moving up like a rising slope. A maximum of 100 frames can be displayed on the screen at a time in this mode.

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Acquisition System

• Mosaic: The whole waveform view is divided into several blocks, and each waveform segment is displayed in each block in sequence. A maximum of 80 frames can be displayed on the screen at a time in this mode.

Figure 7.2 Display Modes

TIP

• The UltraAcquire mode is not available when any of the following functions is enabled:

cursors, decoding, Search, Zoom, Pass/Fail test, waveform recording, reference waveform,

roll mode, slow sweep mode, and XY mode. To switch to the UltraAcquire mode, please

ensure that all of those functions are disabled.

• In UltraAcquire mode, the functions mentioned above (except for roll mode and slow

sweep mode) are disabled. When roll mode or slow sweep mode is enabled, the

acquisition mode is automatically switched to "Normal".

7.2 Sampling Mode

This oscilloscope only supports the real-time sampling mode. In this mode, the oscilloscope produces the waveform display from samples collected during one trigger event. The maximum real-time sample rate of this series is 1.25 GSa/s. The current sample rate is displayed in the acquisition label at the top of the screen.

By default, the operating status label at the left top of the screen is illuminated in green, indicating that the instrument is in real-time sampling, and the button on the toolbar is in green. Click or tap the STOP/RUN button or press the

STOP/RUN

DHO800 User Guide

front-panel key to stop sampling. At this time, the operating status label shows "STOP" in red, and the

STOP/RUN button turns red. Also, the backlight of the front-

panel key turns red. The oscilloscope will maintain its last captured graph. You can still pan or zoom the waveforms by using the horizontal/vertical controls.

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7.3 Sample Rate

Sampling is the process of converting an analog signal into digital data at a specified time interval and then storing them sequentially in acquisition memory. The sample rate is the reciprocal of the time interval.

In Horizontal menu, the "SaRate" item shows the current sample rate. The current sample rate is also indicated in the acquisition label ("A" icon) at the top of the screen, as shown in the figure below.

Sample Rate

The sample rate of the analog channel is related to the instrument model and current channel mode. For two-channel models (DHO802 and DHO812), the oscilloscope provides up to 1.25 GSa/s real-time sample rate in single channel mode and 625 MSa/s real-time sample rate in all channels mode. For four-channel models (DHO814 and DHO804), the oscilloscope provides up to 1.25 GSa/s real-time sample rate in single channel mode, 625 MSa/s real-time sample rate in half channels mode, and

312.5 MSa/s real-time sample rate in all channels mode.

Acquisition System

Sample Interval

• Single channel mode: If any one of the channels is enabled, it is called single channel mode.

• Half channels mode: For four-channel models, if two of the channels are enabled, it is called half channels mode.

• All channels mode: For two-channels models, if all two channels are enabled, it is called all channels mode; for four-channel models, if any three channels or all four channels are enabled, it is called all channels mode.

A sample rate that is too low might have the following effects on the waveform:

• Waveform Distortion: When the sample rate is too low, some waveform details are lost, and the sample waveform displayed is rather different from the actual waveform of the signal.

• Waveform Aliasing: Aliasing occurs when the sample rate is twice lower than the actual signal frequency (Nyquist Frequency). The frequency of the waveform reconstructed from the sample data is smaller than the actual signal frequency.

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Acquisition System

• 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. This series oscilloscope provides up to 25 Mpts memory depth (standard).

Pre-Sample Delayed Sample

Trigger Point

Memory Depth

Figure 7.3 Memory Depth

DHO800 User Guide

The following formula shows the relations among memory depth, sample rate, and horizontal time base:

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Acquisition System

MDepth ≥ SRate x TSCale x HDivs

•

MDepth

•

SRate

•

TSCale

•

HDivs

Therefore, with the same horizontal time base, a higher memory depth can ensure a higher sample rate.

Horizontal menu, click or tap the Mem Depth drop-down button to select the

In memory depth. The default setting is "10k". The selected memory depth value is displayed in the acquisition label ("A" icon) at the top of the screen.

indicates the memory depth. The unit is pts.

indicates the sample rate. The unit is Sa/s.

indicates the horizontal time base. The unit is s/div.

indicates the number of grids in the horizontal direction. The unit is div.

Memory

Depth

• When only one of the channels is enabled, the memory depths available include Auto, 1 kpts, 10 kpts, 100 kpts, 1 Mpts, 5 Mpts, 10 Mpts, and 25 Mpts.

• When two of the channels are enabled, the memory depths available include

Auto, 1 kpts, 10 kpts, 100 kpts, 1 Mpts, 5 Mpts, and 10 Mpts.

• When three channels or all four channels are enabled (only available for fourchannel models), the memory depths available include Auto, 1 kpts, 10 kpts, 100 kpts, 1 Mpts, and 5 Mpts.

TIP

• In "Auto" mode, the oscilloscope selects the memory depth automatically according to

the current sample rate.

• When

Acquisition Mode

Mpts in single channel mode and 1 Mpts in half channels mode/all channels mode.

is set to "Average", the maximum memory depth available is 10

7.5 Horizontal Expansion Reference

This function allows you to set the position that the waveform on the display is referenced to when it is horizontally expanded or compressed when the horizontal time base is adjusted. In the Horizontal menu, click or tap the Expand drop-down button to select the reference position. Available options include Center (default), Left, Right, Trigger, and User.

• Center: when the horizontal time base is modified, the waveform will be expanded or compressed horizontally relative to the center of the display.

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Acquisition System

• Left: when the horizontal time base is modified, the waveform will be expanded

• Right: when the horizontal time base is modified, the waveform will be

• Trigger: when the horizontal time base is modified, the waveform will be

• User: when the horizontal time base is modified, the waveform will be expanded

or compressed horizontally relative to the leftmost position of the display.

expanded or compressed horizontally relative to the rightmost position of the display.

expanded or compressed horizontally relative to the trigger point.

or compressed horizontally relative to the user-defined reference position.

When you select "User", click or tap the value with the displayed numeric keypad. Its range is from -500 to 500, and the default is 0.

7.6 Roll Mode

The roll mode causes the waveform to move across the screen from right to left. It allows you to view the acquired data without waiting for a complete acquisition. In

Horizontal menu, select "Auto" or "OFF" in Roll.

• Auto: the Roll mode is enabled. It is automatically enabled when the horizontal

scale is 50 ms/div or slower.

• OFF: the Roll mode is disabled. The oscilloscope operates at slow sweep speeds when the horizontal scale is 200 ms/div or slower. In slow sweep mode, the oscilloscope acquires the data to the left of the trigger point and then waits for trigger. After the trigger occurs, it continues to acquire the data to the right of the trigger point. When you use this mode to observe low-frequency signals, it is recommended to set the channel coupling mode ( to "DC".

User Expansion input field and set the

To Specify Channel Coupling

)

TIP

• If the Zoom mode is currently turned on, enabling the roll mode automatically turns off

the Zoom mode.

• The following functions are not available when the roll mode is enabled:

To Adjust the Horizontal Position Zoom Mode (Delayed Sweep), Triggering the Oscilloscope, Protocol Decoding, Pass/Fail

Waveform Recording and Playing, Persistence Time, UltraAcquire, Average, XY

Test Mode, Search

7.7 XY Mode

By default, this series oscilloscope uses the YT mode for waveform display window. In YT mode, Y-axis indicates the Voltage and X-axis indicates the Time. Besides, it also

DHO800 User Guide

(available when the oscilloscope run state is STOP),

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Acquisition System

supports the XY display in which both X-axis and Y-axis indicate voltage. The XY mode converts the oscilloscope from a "Voltage-Time" display to a "Voltage-Voltage" display using two input channels.

Enable the XY Mode

You can enable the XY display mode in the following ways.

• Click or tap the toolbar to enter the

Windows button in the function navigation menu or on the

Add Window menu. In the "Diagram" item, click or tap XY >

Add to enable the XY display mode.

• Click or tap the XY button in the function navigation menu or on the toolbar to

enable the XY display mode.

• In the "Horizontal" menu, tick XY to enable the XY mode.

Configure the XY Mode

Click or tap

at the upper-right corner of the XY display window to enter the XY

configuration menu.

Figure 7.4 XY Menu

• Source: Click or tap the drop-down button of "Source X" to select the source

channel of the X-axis in the XY window. Click or tap the drop-down button of "Source Y" to select the source channel of the Y-axis in the XY window.

In the

Add Window menu, you can also configure Source Z. Source Z, as the Z-

axis input in the XY display mode, is used to control whether to display the X-Y waveforms in the XY display mode. This function is called "blanking".

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Acquisition System

- When "None" is selected for "Source Z", the blanking function is disabled,

and you can only see the X-Y waveforms.

- When you select "CH1-CH4" for "Source Z", the blanking function is

enabled. The Z-axis input from the external connector determines whether to display the X-Y waveforms. When Z is high (the input level is greater than 0 V), the X-Y waveforms are displayed; when Z is low (the input level is smaller than 0 V), the waveforms are hidden.

• Grid: Please refer to

To Set the Screen Grid

NOTE

Advanced settings are not available for now. The current settings can produce the best display.

Phase Deviation Measurement

In this mode, you can use the Lissajous method to measure the phase deviation of the two input signals whose frequencies are the same. The following figure shows the measurement schematic diagram of phase deviation.

DHO800 User Guide

Figure 7.5 Measurement Schematic Diagram of Phase Deviation

According to sinƟ=A/B or C/D, Ɵ is the phase deviation angle between the two channels. The definitions of A, B, C, and D are shown in the figure above. The phase deviation angle is obtained, that is:

Ɵ=±arcsin(A/B) or ±arcsin(C/D)

If the principal axis of the ellipse is within Quadrant I and III, the phase deviation angle obtained should be within Quadrant I and IV, namely within (0 to π/2) or (3π/2 to 2π). If the principal axis of the ellipse is within Quadrant II and IV, the phase deviation angle obtained should be within Quadrant II and III, namely within (π/2 to π) or (π to 3π/2).

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Acquisition System

The XY mode can be used to measure the phase deviation occurred when the signal under test passes through a circuit network. Connect the oscilloscope to the circuit to monitor the input and output signals of the circuit.

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Triggering the Oscilloscope

The trigger system allows you to set specific trigger conditions as required. The oscilloscope captures a waveform as well as its neighboring part and displays them on the screen once a particular trigger condition is met. For a digital oscilloscope, it samples waveform continuously no matter whether it is stably triggered. Rather, only stable triggering can produce stable display. The trigger module ensures that every time base sweep or acquisition starts from the user-defined trigger condition, namely every sweep is synchronous with the acquisition and the waveforms acquired are overlapped so as to display the stable waveforms.

You should set the triggers based on the features of the input signal. To quickly capture your desired waveforms, you need to understand the signal under test. This oscilloscope provides a variety of trigger types that help you focus on the desired waveform details.

You can enter the

• Press the front-panel key to enter the trigger menu.

• In

Figure 5.1

Trigger menu in the following ways.

, click or tap the Trigger button to enter the trigger menu.

• Click or tap the trigger label (as shown in the figure below) at the top of the screen to enter the trigger menu.

8.1 Trigger Source

In the "Trigger" menu, click or tap the drop-down button of Source to select the desired source. Available sources include analog channels CH1-CH4 and EXT.

Analog Channel Input

Signals input from analog channels CH1-CH4 can all be used as trigger sources. No matter whether the channel selected is enabled, the channel can work normally.

External Trigger Input (for DHO812 and DHO802 only)

The external trigger source can be used to trigger on the third channel while both the channels are acquiring data. The trigger signal (e.g. external clock or signal of the circuit under test) will be connected to EXT trigger source via the external trigger input terminal [EXT TRIG] connector. You can set the trigger conditions within the range of the trigger level (from -5 V to +5 V).

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8.2 Trigger Level

The adjustment of the trigger level/threshold level is related to the type of the trigger source.

• When the trigger source is CH1-CH4, rotate the front-panel LEVEL knob or use the corresponding multipurpose knob (when the trigger menu is opened) to adjust the trigger level. You can also click or tap the Level input field to set the value with the pop-up numeric keypad. During the adjustment, a trigger level line (the color of the trigger level line is the same as that of the channel) and a

Triggering the Oscilloscope

trigger icon " with the variation of the trigger level. When you stopping modifying the trigger level, the trigger level line disappears in about 2 s. The current trigger level is displayed in the trigger information label at the top of the screen.

In Runt Trigger, Slope Trigger, and Window trigger, you need to set the upper

and lower limits of the trigger level. Two trigger level icons displayed at the right section of the screen.

• When the trigger source is EXT, rotate the front-panel LEVEL knob or use the corresponding multipurpose knob (when the trigger menu is opened) to adjust the trigger level. You can also click or tap the Level input field to set the value with the pop-up numeric keypad. The current trigger level is displayed in the trigger information label at the top of the screen.

For this trigger source, only the variation of the trigger level value is displayed on the screen during the adjustment of the trigger level, without displaying the trigger level lines on the screen.

To better trigger the waveforms, for a trigger with a single level, you can directly click or tap middle of the waveform. However, for a trigger with two levels (e.g. Slope trigger, Runt trigger, Window trigger), you need to click or tap Level B to make the level move within the range of the waveform amplitude.

50% in the menu or press the trigger level knob to make the level move to the

" are displayed on the screen, and they move up and down

and are

90% for Level A and 10% for

8.3 Trigger Mode

The following is the schematic diagram of the acquisition memory. To better understand the trigger event, you can think of the trigger event as dividing acquisition memory into a pre-trigger and post-trigger buffer.

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Triggering the Oscilloscope

After the oscilloscope starts running, it first fills the pre-trigger buffer. Then, after the pre-trigger buffer is filled, the oscilloscope starts searching for a trigger. While searching for the trigger, the data sampled will still be transmitted to the pre-trigger buffer (the new data will continuously overwrite the previous data). When a trigger is found, the pre-trigger buffer contains the events that occurred just before the trigger. Then, the oscilloscope will fill the post-trigger buffer and display the data in the

Trigger Event

Pre-trigger Buffer Post-trigger Buffer

Acquisition Memory

Figure 8.1 Schematic Diagram of the Acquisition Memory

acquisition memory. If the acquisition is initiated via the front-panel

key, the

process repeats; if the acquisition is initiated via the key, it stops after finishing a single acquisition (you can pan and zoom the currently displayed waveform).

This series provides Auto (default), Normal, and Single trigger modes.

Click or tap the trigger information label (as shown in the figure below) at the top of

the screen or press the front-panel

key to open the "Trigger" menu. In the

Sweep item, you can quickly switch the current trigger mode. The selected trigger mode is displayed in the trigger information label at the top of the screen: A (Auto), N (Normal), or S (Single).

• Auto: In this trigger mode, if the specified trigger conditions are not found, triggers are forced and acquisitions are made so that signal activity is displayed on the oscilloscope. This trigger mode can be used when the signal levels are unknown, when the DC signals should be displayed, or when trigger conditions occur often enough that forced triggers are unnecessary.

DHO800 User Guide

• Normal: In this trigger mode, triggers and acquisitions only occur when the

specified trigger conditions are found. This trigger mode can be used when the signal is at a low repetition rate, when you only want to acquire specific events specified by the trigger settings, or when you try to stabilize the display by preventing the oscilloscope from auto-triggering.

• Single: In this trigger mode, a single trigger and acquisition only occur when the specified trigger conditions are found, and then the oscilloscope stops. This

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trigger mode can be used when you need to make a single acquisition of the specified event and analyze the acquisition result. You can pan and zoom the currently displayed waveform without subsequent waveform data overwriting the current waveform. After a single trigger is initiated, the oscilloscope is in "STOP" state.

Normal and Single trigger modes, you can click or tap the Force button in the

trigger menu or press the front-panel key to force a trigger event.

8.4 Trigger Coupling

Trigger coupling determines what part of the signal is passed to the trigger circuit. Please distinguish it from channel coupling ( function is available only when the trigger type is Edge and the trigger source is an analog channel.

Triggering the Oscilloscope

To Specify Channel Coupling

). This

In the "Trigger" menu, click or tap the Coupling drop-down button to select the desired coupling mode (by default, it is DC).

• DC: allows DC and AC components to pass the trigger circuitry.

• AC: blocks the DC components and attenuates the signals.

• LFR: blocks the DC components and rejects the low-frequency components.

• HFR: rejects the high frequency components.

TIP

When "AC" or "LFR" is selected as the coupling mode, no trigger level lines and trigger icons

are displayed. When you adjust the trigger level, you can only see the changes of the trigger

level values in the trigger information label at the top of the screen.

8.5 Trigger Holdoff

Trigger holdoff can be help stabilize triggering on complex repetitive waveforms that have multiple edges or other events between waveform repetitions (such as pulse series). Holdoff time is specified as the amount of time that the oscilloscope waits for re-arming the trigger circuitry after generating a correct trigger. The oscilloscope will not trigger even if the trigger condition is met during the holdoff time and will only re-arm the trigger circuitry after the holdoff time expires.

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Triggering the Oscilloscope

For example, to get a stable trigger on the repetitive pulse burst as shown in the figure below, set the holdoff time to be greater than t1 but less than t2.

Figure 8.2 Trigger Holdoff

Click or tap the trigger information label (as shown in the figure below) at the top of

the screen or press the front-panel tap the input field of Holdoff to set the holdoff time (the holdoff to this time when the waveforms are stably triggered) with the pop-up numeric keypad. You can also use the corresponding multipurpose knob to set the value. The adjustable range of the holdoff time is from 8 ns (default) to 10 s.

8.6 Noise Rejection

Noise rejection can reject the high frequency noise in the signal and reduce the possibility of triggering the oscilloscope by mistake.

Click or tap the trigger information label (as shown in the figure below) or press the

front-panel key to open the "Trigger" menu. Click or tap the Noise Reject on/off switch to enable or disable the noise rejection function.

key to open the "Trigger" menu. Click or

8.7 Trigger Type

This series oscilloscope provides the following trigger types.

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8.7.1 Edge Trigger

Edge trigger identifies a trigger on the trigger level of the specified edge on the input signal.

Trigger Type

Click or tap the Type drop-down button to select "Edge".

Triggering the Oscilloscope

Figure 8.3 Edge Trigger Setting Menu

After a trigger type is selected, the current trigger setting information (including the trigger type, source, and level) is displayed in the trigger information label at the top of the screen, as shown in the figure below. The information will change based on the trigger settings.

Source Selection

Click or tap the models only). For details, refer to indicated in the trigger information label at the top of the screen.

Only when you select the channel that has signal inputs as the trigger source, can you obtain a stable trigger.

Edge Type

Source drop-down button to select CH1-CH4 or EXT(for two-channel

Trigger Source

. The selected trigger source is

In the The selected slope will be indicated in the trigger information label.

Slope item, select which edge of the input signal will trigger the oscilloscope.

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Triggering the Oscilloscope

• Rising: triggers on the rising edge of the input signal when the voltage level meets the specified trigger level.

• Falling: triggers on the falling edge of the input signal when the voltage level meets the specified trigger level.

• Either: triggers on the rising or falling edge of the input signal when the voltage level meets the preset trigger level.

TIP

When edge trigger is selected, you can also press the front-panel key to switch the

edge type.

Trigger Mode

In Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer to descriptions in

Trigger Mode

Trigger Parameter Setting

You can refer to

Trigger Coupling, Trigger Holdoff

coupling, trigger holdoff, and noise rejection under this trigger type.

Trigger Level

Click or tap the

Level input field to set the trigger level with the pop-up numeric

keypad. You can also use the front-panel trigger level knob or the corresponding multipurpose knob to set the trigger level. For details, refer to descriptions in

. The current trigger level is displayed in the trigger information label at the top

Level

of the screen.

8.7.2 Pulse Width Trigger

Pulse width triggering sets the oscilloscope to trigger on the positive or negative pulse of a specified width. In this mode, the oscilloscope will trigger when the pulse width of the input signal satisfies the specified pulse width condition.

In this oscilloscope, positive pulse width is defined as the time difference between the two crossing points of the trigger level and positive pulse; negative pulse width is defined as the time difference between the two crossing points of the trigger level and negative pulse, as shown in the figure below.

, and

Noise Rejection

to set the

Trigger

DHO800 User Guide

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Triggering the Oscilloscope

Trigger Type

Click or tap the

+Width

-Width

Trigger Level

Figure 8.4 Positive/Negative Pulse Width

Type drop-down button to select "Pulse".

Figure 8.5 Pulse Width Trigger Setting Menu

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Triggering the Oscilloscope

Source Selection

Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source

label at the top of the screen.

Only when you select the channel that has signal inputs as the trigger source, can you obtain a stable trigger.

Polarity

In the Polarity item, select the desired polarity: positive polarity ( ) or negative

polarity ( ).

Trigger Condition

Set the trigger condition in the When item.

. The selected trigger source is indicated in the trigger information

• When you select "Positive" for polarity, ">" for trigger condition, the oscilloscope triggers when the positive pulse width of the input signal is greater than the specified pulse width.

• When you select "Positive" for polarity, "<" for trigger condition, the oscilloscope triggers when the positive pulse width of the input signal is smaller than the specified pulse width.

• When you select "Positive" for polarity, "< >" for trigger condition, the oscilloscope triggers when the positive pulse width of the input signal is greater than the specified lower limit of pulse width and smaller than the specified upper limit of pulse width.

• When you select "Negative" for polarity, ">" for trigger condition, the oscilloscope triggers when the negative pulse width of the input signal is greater than the specified pulse width.

• When you select "Negative" for polarity, "<" for trigger condition, the oscilloscope triggers when the negative pulse width of the input signal is smaller than the specified pulse width.

• When you select "Negative" for polarity, "< >" for trigger condition, the oscilloscope triggers when the negative pulse width of the input signal is greater than the specified lower limit of pulse width and smaller than the specified upper limit of pulse width.

DHO800 User Guide

Pulse Width Setting

• In the

When menu, when ">" or "<" is selected, click or tap the input field of

Upper or lower to set the upper limit value or the lower limit value with the

pop-up numeric keypad. You can also use the corresponding multipurpose knob to set the value. The pulse width available is from 1 ns to 10 s.

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Triggering the Oscilloscope

• In the When menu, when "< >" is selected, click or tap the input field of Upper and Lower respectively to set the upper limit value and the lower limit value with the pop-up numeric keypad. You can also use the corresponding multipurpose knob to set the values. The lower limit of the pulse width must be smaller than the upper limit.

Trigger Mode

Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer to

In descriptions in

Trigger Parameter Setting

Trigger Mode

You can refer to noise rejection under this trigger type.

Trigger Level

Click or tap the Level input field to set the trigger level with the pop-up numeric keypad. You can also use the front-panel trigger level knob or the corresponding multipurpose knob to set the trigger level. For details, refer to descriptions in

Level

. The current trigger level is displayed in the trigger information label at the top

of the screen.

Trigger Holdoff

8.7.3 Slope Trigger

Slope triggering sets the oscilloscope to trigger on the positive or negative slope of the specified time. This trigger mode is applicable to ramp and triangle waveforms.

In this oscilloscope, positive slope time is defined as the time difference between the two crossing points of trigger level line A and B with the rising edge; negative slope time is defined as the time difference between the two crossing points of trigger level line A and B with the falling edge. See the figure below.

and

Noise Rejection

to set the trigger holdoff and

Trigger

Upper Limit of Trigger Level (Up Level)

Lower Limit of Trigger Level (Low Level)

Positive Slope Time

Figure 8.6 Positive Slope Time/Negative Slope Time

Trigger Type

Click or tap the Type drop-down button to select "Slope".

Negative Slope Time

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Triggering the Oscilloscope

Figure 8.7 Slope Trigger Setting Menu

After a trigger type is selected, the current trigger setting information (including trigger type, trigger source, and trigger level) is displayed in the trigger information label at the top of the screen, as shown in the figure below. The information will change based on the trigger settings.

Source Selection

Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source

. The selected trigger source is indicated in the trigger information

label at the top of the screen.

Only when you select the channel that has signal inputs as the trigger source, can you obtain a stable trigger.

Edge Type

DHO800 User Guide

Select the input signal edge (in the

Slope item) on which the oscilloscope triggers.

• Rising: triggers on the rising edge of the input signal.

• Falling: triggers on the falling edge of the input signal.

Trigger Condition

Set the trigger condition in the When item.

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Triggering the Oscilloscope

• When you select "Rising" for the edge type, ">" for trigger condition, the oscilloscope triggers when the positive slope time of the input signal is greater than the specified time.

• When you select "Rising" for the edge type, "<" for trigger condition, the oscilloscope triggers when the positive slope time of the input signal is smaller than the specified time.

• When you select "Rising" for the edge type, "< >" for trigger condition, the oscilloscope triggers when the positive slope time of the input signal is greater than the specified lower limit time and smaller than the specified upper limit time.

• When you select "Falling" for the edge type, ">" for trigger condition, the oscilloscope triggers when the negative slope time of the input signal is greater than the specified time.

• When you select "Falling" for the edge type, "<" for trigger condition, the oscilloscope triggers when the negative slope time of the input signal is smaller than the specified time.

• When you select "Falling" for the edge type, "< >" for trigger condition, the oscilloscope triggers when the negative slope time of the input signal is greater than the specified lower limit time and smaller than the specified upper limit time.

Slope Time Setting

• In the

When item, when ">" or "<" is set to trigger conditions, click or tap the

input field of Lower or Upper to set the lower limit value or the upper limit value with the pop-up numeric keypad. You can also use the corresponding knob to set the value. The slope time available is from 1 ns to 10 s.

• In the

When item, when "< >" is set to trigger conditions, click or tap the input

field of Upper and Lower respectively to set the upper limit value and the lower limit value with the pop-up numeric keypad. You can also use the corresponding knob to set the values. The lower slope time limit must be smaller than the upper slope time limit.

Trigger Mode

Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer to

In descriptions in

Trigger Mode

Trigger Parameter Setting

You can refer to

Trigger Holdoff

and

Noise Rejection

to set the trigger holdoff and

noise rejection under this trigger type.

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Triggering the Oscilloscope

Level Selection and Setting

After the trigger condition setting is completed, you need to adjust the trigger level to correctly trigger the signal and obtain a stable waveform.

Click or tap the Level A/Level B input field to set the level A/level B with the pop-up numeric keypad. You can also use the trigger level knob or use the corresponding multipurpose knob to adjust level A/level B. When and lower limit values change at the same time. The difference between upper and lower limit remains unchanged. For details, refer to descriptions in current trigger level is displayed in the trigger information label at the top of the screen.

TIP

Press the trigger level knob to switch between three modes: "only adjust Level A", "only adjust

Level B", and "adjust Level A and Level B at the same time".

Linkage is ticked, the upper limit

Trigger Level

. The

8.7.4 Video Trigger

The video signal can include image information and timing information, which adopts different standards and formats. This series can trigger on the standard video signal field or line of NTSC (National Television Standards Committee), PAL (Phase Alternating Line), or SECAM (Sequential Couleur A Memoire).

Trigger Type

Click or tap the Type drop-down button to select "Video".

DHO800 User Guide

Figure 8.8 Video Trigger Setting Menu

After a trigger type is selected, the current trigger setting information (including trigger type, trigger source, and trigger level) is displayed in the trigger information

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Triggering the Oscilloscope

label at the top of the screen, as shown in the figure below. The information will change based on the trigger settings.

Source Selection

Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source

. The selected trigger source is indicated in the trigger information

label at the top of the screen.

Only when you select the channel that has signal inputs as the trigger source, can you obtain a stable trigger.

Video Polarity

In the

Polarity item, select the desired polarity: positive polarity ( ) or negative

polarity ( ).

Video Standard

Click or tap the drop-down button of

Standard to select the desired video standard.

Table 8.1 Video Standard

Video Standard

Frame Frequency (Frame)

Scan Type TV Scan Line

NTSC 30 Interlaced Scan 525 PAL/SECAM 25 Interlaced Scan 625 480p/60Hz 60 Progressive Scan 525 576p/50Hz 50 Progressive Scan 625 720p/60Hz 60 Progressive Scan 750 720p/50Hz 50 Progressive Scan 750 720p/30Hz 30 Progressive Scan 750 720p/25Hz 25 Progressive Scan 750 720p/24Hz 24 Progressive Scan 750 1080p/60Hz 60 Progressive Scan 1125 1080p/50Hz 50 Progressive Scan 1125 1080p/30Hz 30 Progressive Scan 1125 1080p/25Hz 25 Progressive Scan 1125 1080p/24Hz 24 Progressive Scan 1125 1080i/60Hz 60 Interlaced Scan 1125 1080i/50Hz 50 Interlaced Scan 1125

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Triggering the Oscilloscope

Sync

In the Sync item, select the desired sync type.

• All Lines: triggers on the first line found.

• Line: triggers on the specified line.

When this sync type is selected, you can specify a line number. Click or tap the input field of You can also use the corresponding multipurpose knob to set the value. The range of the line number is related to the currently selected video standards. The range is from 1 to 525 (NTSC), 1 to 625 (PAL/SECAM), 1 to 525 (480p), 1 to 625 (576p), 1 to 750 (720p), or 1 to 1125 (1080p/1080i).

• Odd: triggers on the rising edge of the first ramp pulse in the odd field. It is only available when the video standard is set to "NTSC" or "PAL/SECAM".

• Even: triggers on the rising edge of the first ramp pulse in the even field. It is only available when the video standard is set to "NTSC" or "PAL/SECAM".

Line to set the line number by using the pop-up numeric keypad.

Trigger Mode

Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer to

In descriptions in

Trigger Mode

Trigger Parameter Setting

You can refer to

Noise Rejection

to set the noise rejection under this trigger type.

Trigger Level

Click or tap the

Level input field to set the trigger level with the pop-up numeric

keypad. You can also use the front-panel trigger level knob or the corresponding multipurpose knob to set the trigger level. For details, refer to descriptions in

Level

. The current trigger level is displayed in the trigger information label at the top

Trigger

of the screen.

TIP

• To better observe the waveform details in the video signal, you can set a larger memory

depth first.

• In the trigger debugging process of video signals, the frequency in different part of the

signal can be reflected by a different brightness, as RIGOL's digital oscilloscope provides

the intensity graded color display function. Experienced users can quickly judge the

signal quality and discover abnormalities during the debugging process.

8.7.5 Pattern Trigger

The pattern trigger identifies a trigger condition by looking for a specified pattern. This pattern is a logical "AND" combination of channels. Each channel can be set to H (high), L (low), or X (don't care). A rising or falling edge (you can only specify a single

DHO800 User Guide

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Triggering the Oscilloscope

edge) can be specified for one channel included in the pattern. When an edge is specified, the oscilloscope will trigger at the edge specified if the pattern set for the other channels are true (namely the actual pattern of the channel is the same as the preset pattern). If no edge is specified, the oscilloscope will trigger on the last edge that makes the pattern true. If all the channels in the pattern are set to "X", the oscilloscope will not trigger.

Figure 8.9 Pattern Trigger

Trigger Type

Click or tap the

Type drop-down button to select "Pattern".

Figure 8.10 Pattern Trigger Setting Menu

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Triggering the Oscilloscope

Source Selection

Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source

label at the top of the screen.

Only when you select the channel that has signal inputs as the trigger source, can you obtain a stable trigger.

Pattern Setting

The following five patterns are available:

• 1: sets the pattern of the channel selected to "1", i.e. the voltage level is higher than the trigger level of the channel.

• 0: sets the pattern of the channel selected to "0", i.e. the voltage level is lower than the trigger level of the channel.

• X: sets the pattern of the channel selected to "X", i.e. this channel is not used as a part of the pattern. When all channels in the pattern are set to "X", the oscilloscope will not trigger.

. The selected trigger source is indicated in the trigger information

•

: sets the pattern to the rising edge of the channel selected.

: sets the pattern to the falling edge of the channel selected.

The Left/Right arrow key indicates moving left/right to switch the channel pattern. "All" indicates all bits. Select a pattern for a channel and then click or tap

All. The

patterns of all the other channels will be set to the currently selected pattern.

Only one edge (rising or falling edge) can be specified in the pattern. If one edge item is currently defined and then another edge item is defined in another channel in the pattern, then a prompt message "Invalid input" is displayed.

Trigger Mode

Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer to

In descriptions in

Trigger Mode

Trigger Parameter Setting

You can refer to

Trigger Holdoff

and

Noise Rejection

to set the trigger holdoff and

noise rejection under this trigger type.

Trigger Level

DHO800 User Guide

Click or tap the

Level input field to set the trigger level with the pop-up numeric

keypad. You can also use the front-panel trigger level knob or the corresponding multipurpose knob to set the trigger level. For details, refer to descriptions in

. The current trigger level is displayed in the trigger information label at the top

Level

Trigger

of the screen.

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8.7.6 Duration Trigger

In duration trigger, the oscilloscope identifies a trigger condition by searching for the duration of a specified pattern. This pattern is a logical "AND" combination of the channels. Each channel can be set to 1 (high), 0 (low), or X (don't care). The instrument triggers when the duration (∆T) of this pattern meets the preset time, as shown in the figure below.

Triggering the Oscilloscope

CH1

CH2

CH3

CH4

∆T ∆T

Figure 8.11 Duration Trigger

Pattern:HLHL

Trigger Type

Click or tap the drop-down button of Type to select "Duration".

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Triggering the Oscilloscope

Figure 8.12 Duration Trigger Setting Menu

Source Selection

Click or tap the

Trigger Source

Source drop-down button to select CH1-CH4. For details, refer to

. The selected trigger source is indicated in the trigger information

label at the top of the screen.

Only when you select the channel that has signal inputs as the trigger source, can you obtain a stable trigger.

Pattern Setting

DHO800 User Guide

The following three patterns are available:

• 1: sets the pattern of the channel selected to "1", i.e. the voltage level is higher than the trigger level of the channel.

• 0: sets the pattern of the channel selected to "0", i.e. the voltage level is lower than the trigger level of the channel.

• X: sets the pattern of the channel selected to "X", i.e. this channel is not used as a part of the pattern. When all channels in the pattern are set to "X", the oscilloscope will not trigger.

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Triggering the Oscilloscope

The Left/Right arrow key indicates moving left/right to switch the channel pattern. "All" indicates all bits. Select a pattern for a channel and then click or tap All. The patterns of all the other channels will be set to the currently selected pattern.

Trigger Condition

Set the trigger condition in the When item.

• >: triggers when the duration of the pattern is greater the preset time. Click or

tap the input field of Lower to set the lower limit of the duration of the pattern with the pop-up numeric keypad. You can also use the corresponding multipurpose knob to set the value. The available range is from 1 ns to 10 s.

• <: triggers when the duration of the pattern is smaller than the preset time. Click or tap the input field of Upper to set the upper limit of the duration of the pattern. You can also use the corresponding multipurpose knob to set the value. The available range is from 1 ns to 10 s.

• < >: triggers when the duration of the pattern is smaller than the upper limit of the preset time and greater than the lower limit of the preset time. Click or tap the input field of the range is from 1.01 ns to 10 s. Click or tap the input field of

Upper to set the upper limit of the duration of the pattern, and

Lower to set the

lower limit of the duration of the pattern, and the range is from 1 ns to 9.9 s. You can also use the corresponding multipurpose knob to set the upper/lower limit. The lower time limit must be smaller than the upper time limit.

• > <: triggers when the duration of the pattern is greater than the upper limit of the preset time or smaller than the lower limit of the preset time. Click or tap the input field of range is from 1.01 ns to 10 s. Click or tap the input field of

Upper to set the upper limit of the duration of the pattern, and the

Lower to set the

Trigger Mode

Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer to

In descriptions in

Trigger Mode

Trigger Parameter Setting

You can refer to

Trigger Holdoff

and

Noise Rejection

to set the trigger holdoff and

noise rejection under this trigger type.

Trigger Level

Click or tap the

Level input field to set the trigger level with the pop-up numeric

keypad. You can also use the front-panel trigger level knob or the corresponding multipurpose knob to set the trigger level. For details, refer to descriptions in

Level

. The current trigger level is displayed in the trigger information label at the top

Trigger

of the screen.

Page 96

Triggering the Oscilloscope

8.7.7 Timeout Trigger

In Timeout trigger, the oscilloscope triggers when the time interval (∆T) (the time from when the rising edge (or falling edge) of the input signal passes through the trigger level to the time from when the neighboring falling edge (or rising edge) passes through the trigger level) is greater than the preset timeout value, as shown in

Figure 8.13

Time Out

Figure 8.13 Timeout Trigger

Trigger Type

Click or tap the Type drop-down button to select "Timeout".

Time Out

DHO800 User Guide

Figure 8.14 Timeout Trigger Menu

Page 97

Triggering the Oscilloscope

Source Selection

Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source

. The selected trigger source is indicated in the trigger information

label at the top of the screen.

Only when you select the channel that has signal inputs as the trigger source, can you obtain a stable trigger.

Edge Type

In Slope item, select the edge type from which the input signal passes through the trigger level.

• Rising: starts timing when the rising edge of the input signal passes through the trigger level.

• Falling: starts timing when the falling edge of the input signal passes through the trigger level.

• Either: starts timing when either edge of the input signal passes through the trigger level.

Timeout Value

Timeout value represents the maximum time that the signal remains idle before the signal passes through the trigger level. Click or tap the input field of

Timeout, and

then use the pop-up numeric keypad to set the timeout value of Timeout trigger. You can also use the corresponding multipurpose knob to set the value.

Trigger Mode

Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer to

In descriptions in

Trigger Mode

Trigger Parameter Setting

You can refer to

Noise Rejection

to set the noise rejection under this trigger type.

Trigger Level

Click or tap the

Level input field to set the trigger level with the pop-up numeric

keypad. You can also use the front-panel trigger level knob or the corresponding multipurpose knob to set the trigger level. For details, refer to descriptions in

Level

. The current trigger level is displayed in the trigger information label at the top

Trigger

of the screen.

Page 98

Triggering the Oscilloscope

8.7.8 Runt Trigger

The runt trigger sets the oscilloscope to trigger pulses that cross one trigger level but not another, as shown in the figure below.

Upper Limit of the Trigger Level

Lower Limit of the Trigger Level

Positive Runt Pulse

Negative Runt Pulse

Figure 8.15 Runt Trigger

Trigger Type

Click or tap the drop-down button of Type to select "Runt".

Figure 8.16 Runt Trigger Setting Menu

DHO800 User Guide

Page 99

Triggering the Oscilloscope

Source Selection

Click or tap the Source drop-down button to select CH1-CH4. For details, refer to

Trigger Source

. The selected trigger source is indicated in the trigger information

label at the top of the screen.

Only when you select the channel that has signal inputs as the trigger source, can you obtain a stable trigger.

Polarity

Select the pulse polarity of Runt trigger under the Polarity item.

• Positive

• Negative

: indicates that the instrument triggers on the positive runt pulse.

: triggers on the negative runt pulse.

Trigger Condition

Set the Runt trigger condition in the When item.

• None: indicates not setting the trigger condition of Runt trigger.

• >: triggers when the runt pulse width is greater the Lower limit of pulse width.

Click or tap the input field of Lower to set the minimum pulse width of Runt trigger with the pop-up numeric keypad. You can also use the corresponding multipurpose knob to modify the value.

• <: triggers when the runt pulse width is smaller than the upper limit of pulse width. Click or tap the input field of

Upper to set the maximum pulse width of

Runt trigger with the pop-up numeric keypad. You can also use the corresponding multipurpose knob to modify the value.

• < >: triggers when the runt pulse width is greater than the lower limit and smaller than the upper limit of pulse width. Click or tap the input field of

Upper

to set the maximum pulse width of Runt trigger with the pop-up numeric keypad. Click or tap the input field of

Lower to set the minimum pulse width of

Runt trigger with the pop-up numeric keypad. You can also use the corresponding multipurpose knob to modify the maximum and minimum pulse width. The lower limit of the pulse width must be smaller than the upper limit.

Trigger Mode

Sweep, select Auto, Normal, or Single as the trigger mode. For details, refer to

In descriptions in

Trigger Mode

Trigger Parameter Setting

You can refer to

Trigger Holdoff

and

Noise Rejection

to set the trigger holdoff and

noise rejection under this trigger type.

Page 100

Triggering the Oscilloscope

Level Selection and Setting

After the trigger condition setting is completed, you need to adjust the trigger level to correctly trigger the signal and obtain a stable waveform.

TIP

Press the trigger level knob to switch between three modes: "only adjust Level A", "only adjust

Level B", and "adjust Level A and Level B at the same time".

Linkage is ticked, the upper limit

Trigger Level

. The

8.7.9 Window Trigger

Window trigger provides a high trigger level and a low trigger level. The instrument triggers when the input signal passes through the high trigger level or the low trigger level.

Trigger Type

Click or tap the Type drop-down button to select "Over".

DHO800 User Guide

Figure 8.17 Window Trigger Setting Menu

After a trigger type is selected, the current trigger setting information (including trigger type, trigger source, and trigger level) is displayed in the trigger information

Rigol DHO800 Userguide

Specifications and Main Features

Frequently Asked Questions

User Manual

List of Figures

List of Tables

Safety Requirement

1.1 General Safety Summary

1.2 Safety Notices and Symbols

1.3 Measurement Category

1.4 Ventilation Requirement

1.5 Working Environment

1.6 Care and Cleaning

1.7 Environmental Considerations

Product Features

Document Overview

Quick Start

4.1 General Inspection

4.2 Appearance and Dimensions

4.3 To Prepare for Use

4.3.1 To Adjust the Supporting Legs

4.3.2 To Connect to Power

4.3.3 Turn-on Checkout

4.3.4 To Set the System Language

4.3.5 To Connect the Probe

4.3.6 Function Inspection

4.3.7 Probe Compensation

4.4 Product Overview

4.4.1 Front Panel Overview

4.4.2 Rear Panel Overview

4.4.3 User Interface Overview

4.5 Touch Screen Gestures

4.5.1 Tap

4.5.2 Drag

4.5.3 Pinch&Stretch

4.6 Parameter Setting Method

4.7 To Use the Security Lock

4.8 To Use the Built-in Help System

Vertical System

5.1 To Enable or Disable the Analog Channel

5.2 To Adjust the Vertical Scale

5.3 To Adjust the Vertical Offset

5.4 To Specify Channel Coupling

5.5 To Specify Bandwidth Limit

5.6 To Specify Input Impedance

5.7 To Invert a Waveform

5.8 To Set Probe

5.9 To Specify the Amplitude Unit

5.10 To Adjust Bias

5.11 To Specify the Skew

5.12 To Turn the Channel Label Display On/Off

Horizontal System

6.1 To Adjust the Horizontal Time Base

6.2 To Adjust the Horizontal Position

6.3 Zoom Mode (Delayed Sweep)

Acquisition System

7.1 Acquisition Mode

7.2 Sampling Mode

7.3 Sample Rate

7.4 Memory Depth

7.5 Horizontal Expansion Reference

7.6 Roll Mode

7.7 XY Mode

Triggering the Oscilloscope

8.1 Trigger Source

8.2 Trigger Level

8.3 Trigger Mode

8.4 Trigger Coupling

8.5 Trigger Holdoff

8.6 Noise Rejection

8.7 Trigger Type

8.7.1 Edge Trigger

8.7.2 Pulse Width Trigger

8.7.3 Slope Trigger

8.7.4 Video Trigger

8.7.5 Pattern Trigger

8.7.6 Duration Trigger

8.7.7 Timeout Trigger

8.7.8 Runt Trigger

8.7.9 Window Trigger