RIGOL DSG800-PUG, OCXO-B08, PUG-DSG3000 User manual

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User Guide

DSG800 Series RF Signal Generator

Aug. 2019

RIGOL (SUZHOU) TECHNOLOGIES INC.

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RIGOL

Guaranty and Declaration

Trademark Information

RIGOL is a registered trademark of RIGOL (SUZHOU) TECHNOLOGIES INC.

Publication Number

UGG02108-1110

Software Version

00.01.07 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.

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.

DSG800 User Guide I

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RIGOL

Safety Requirement

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 local country could be used.

Ground the Instrument.

The instrument is grounded through the Protective Earth lead of the power cord. To avoid electric shock, connect the earth terminal of the power cord to the Protective Earth terminal before connecting any input or output terminals.

Connect the Probe Correctly.

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.

Do Not Operate Without Covers.

Do not operate the instrument with covers or panels removed.

Do Not Insert Objects Into the Air Outlet.

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

Use Proper Fuse.

Please use the specified fuses.

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Avoid Circuit or Wire Exposure.

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

Do Not Operate With Suspected Failures.

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.

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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RIGOL

WARNING

avoided, will result in serious injury or death.

CAUTION

avoided, could result in damage to the product or loss of important data.

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

product.

Hazardous

Safety

Protective

Terminal

Chassis

Test

Safety Notices and Symbols

Safety Notices in this Manual:

Indicates a potentially hazardous situation or practice which, if not

Safety Terms on the Product:

result in damage to the product or other devices connected to the

Safety Symbols on the Product:

Voltage

Warning

Earth

Ground

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CAUTION

WARNING

supply.

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 wa ter. 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.

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

To avoid short-circuit resulting from moisture or personal injuries, ensure that the instrument is completely dry before connecting it to the power

Environmental Considerations

The following symbol indicates that this product complies with the WEEE Directive 2002/96/EC.

Product End-of-Life Handling

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.

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RIGOL

DSG800 Series Overview

DSG800 series RF signal generator provides all-round modulation plans. It provides standard AM/FM/ØM functions as well as optional pulse modulation function, and pulse train generator. Besides, DSG821A and DSG836A are equipped with a standard configuration of I/Q modulation function. All the modulation functions support both external and internal sources. Besides, to fulfill the application requirements of the production lines, severe test verifications are performed on DSG800 during the design and production phases to ensure its stability and reliability. DSG800 provides clear panel layout and is easy-to-operate. It can output stable, accurate and pure signals. Besides, it is small in size and light in weight. DSG800 is an ideal tool for various fields such as communication, computer, instrumentation, research, education, production and maintenance.

Main Features:

 Up to 1.5 GHz/2.1 GHz/3 GHz/3.6 GHz frequency  The typical value of amplitude precision is not greater than 0.5 dB  -110 dBm to +20 dBm output power  High signal purity; the typical value of phase noise is lower than -112dBc/Hz@20

kHz

 Provide 2 ppm internal clock (standard) as well as an optional 5 ppb highly

stable clock

 Provide AM/FM/ØM analog modulation functions (standard)  Provide optional pulse modulation with up to 70 dB on/off ratio; it also provides

optional pulse train generator

 Provide I/Q modulation and I/Q baseband output (the two are available as

standard configuration only for DSG821A and DSG836A)

 All the modulation functions support both internal and external modulation

modes

 It is designed with a height of 2U which saves the rack space; it also provides

the rack mount kit

 Provide USB/LAN remote control interfaces (standard) and standard SCPI

command set

 Provide the system flatness calibration (cable, attenuator, amplifier and etc.)

function

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Document Overview

Main Topics in this Manual

Chapter 1 Quick Start

This chapter introduces the front panel, rear panel and user interface of the RF signal generator as well as the precautions when using the instrument for the first time.

Chapter 2 Front Panel Operations

This chapter introduces the functions of the keys at the front panel of the RF signal generator as well as the menu functions under the keys in details.

Chapter 3 Remote Control

This chapter introduces how to control the RF signal generator remotely.

Chapter 4 Application Examples

This chapter provides some application examples of the RF signal generator.

Chapter 5 Troubleshooting

This chapter lists the common failures that might occur when using the RF signal generator as well as their solutions.

Chapter 6 Appendix

This chapter provides the accessory list of the RF signal generator as well as the service and support information.

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Model

Frequency Range

I/Q Modulation

DSG815

9 kHz to 1.5 GHz

DSG821

9 kHz to 2.1 GHz

DSG821A

9 kHz to 2.1 GHz

Standard

DSG830

9 kHz to 3 GHz

DSG836

9 kHz to 3.6 GHz

Format Conventions in this Manual

1. Key:

The key at the front panel is denoted by the format of "Text B ox + Key Name (Bold)" in the manual. For example, FREQ denotes the FREQ ke y.

2. Menu:

The menu is denoted by the format of "Character Shading + Menu Word (Bold)" in the manual. For example, LF denotes the low frequency menu item under

FREQ.

3. Connector:

The connector at the front or rear panel is denoted by the format of "Square Brackets + Connector Name (Bold)" in the manual. For example, [RF OUTPUT

50Ω].

4. Operation Step:

The next step of operation is denoted by an arrow "" in the manual. For example, FREQ  LF denotes pressing FREQ at the front panel and then pressing LF.

Content Conventions in this Manual

DSG800 series RF signal generator includes the following models. This manual takes DSG836A as an example.

DSG836A 9 kHz to 3.6 GHz Standard

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Contents RIGOL

Contents

Guaranty and Declaration ......................................................................... I

Safety Requirement ................................................................................ II

General Safety Summary ........................................................................... II

Safety Notices and Symbols ...................................................................... IV

Care and Cleaning .................................................................................... V

Environmental Considerations .................................................................... V

DSG800 Series Overview........................................................................ VI

Document Overview .............................................................................. VII

Chapter 1 Quick Start ......................................................................... 1-1

General Inspection ................................................................................ 1-2

Appearance and Dimensions ................................................................... 1-3

Front Panel Overview ............................................................................. 1-5

Rear Panel Overview ............................................................................. 1-11

To Use DSG800 for the First Time .......................................................... 1-16

To Connect the Power Supply .......................................................... 1-16

Power-on Inspection ...................................................................... 1-16

To Set the System Language ........................................................... 1-16

User Interface ...................................................................................... 1-17

To Use the Built-in Help System ............................................................. 1-21

Chapter 2 Front Panel Operations ...................................................... 2-1

To Set the Frequency/LF Parameters ....................................................... 2-2

Frequency ...................................................................................... 2-2

LF Output ...................................................................................... 2-2

To Set the Amplitude Parameters ............................................................ 2-4

Amplitude ...................................................................................... 2-4

Flatness Calibration ......................................................................... 2-4

Amplitude Unit ................................................................................ 2-5

Sweep .................................................................................................. 2-6

Sweep Manner ................................................................................ 2-6

Swee

p Direction .............................................................................. 2-6

Sweep Type .................................................................................... 2-7

Sweep Mode.................................................................................. 2-10

Single Sweep ................................................................................. 2-10

To Reset the Sweep ....................................................................... 2-11

Trigger Mode ................................................................................. 2-11

Modulation .......................................................................................... 2-14

Amplitude Modulation (AM) ............................................................. 2-14

Frequency Modulation (FM)............................................................. 2-17

Phase Modulation (ØM) .................................................................. 2-20

Pulse Modulation (Option DSG800-PUM) .......................................... 2-23

I/Q Modulation (Only Available for DSG821A/DSG836A) ..................... 2-29

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Store and Recall ................................................................................... 2-35

File Type ....................................................................................... 2-36

Save ............................................................................................. 2-37

Recall ........................................................................................... 2-40

Rename ........................................................................................ 2-40

Delete .......................................................................................... 2-40

Copy ............................................................................................ 2-40

To Create a Directory ..................................................................... 2-41

Filename Prefix ............................................................................. 2-41

Format ......................................................................................... 2-41

System Update .............................................................................. 2-41

To Set the System Parameters ............................................................... 2-42

Language ..................................................................................... 2-42

Reset............................................................................................ 2-42

I/O Configuration .......................................................................... 2-46

Display Setting .............................................................................. 2-48

Power Status ................................................................................. 2-48

Information ................................................................................... 2-49

License ......................................................................................... 2-49

Self-test ........................................................................................ 2-50

Sanitation ..................................................................................... 2-50

Chapter 3 Remote Control ................................................................. 3-1

Remote Control Overview ....................................................................... 3-2

Remote Control Via USB ......................................................................... 3-3

Remote Control Via LAN .......................................................................... 3-4

Chapter 4 Application Examples ........................................................ 4-1

To Output a RF Signal ............................................................................. 4-2

To Output a RF Sweep Signal .................................................................. 4-3

To Output a RF Modulated Signal ............................................................. 4-5

ter 5 Troubleshooting ................................................................ 5-1

Chap

Chapter 6 Appendix ........................................................................... 6-1

Appendix A: DSG800 Accessories and Options........................................... 6-1

Appendix B: Warranty ............................................................................. 6-2

Index ........................................................................................................ 1

X DSG800 User Guide

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Chapter 1 Quick Start RIGOL

Chapter 1 Quick Start

This chapter guides users to quickly get familiar with the appearance, dimensions, front panel, rear panel and user interface of DSG800 series RF signal generator.

The topics of this chapter:

 General Inspection  Appearance and Dimensions  Front Panel Overview  Rear Panel Overview  To Use DSG800 for the First Time  User Interface  To Use the Built-in Help System

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RIGOL Chapter 1 Quick Start

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.

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Chapter 1 Quick Start RIGOL

236

112

261.5 208

318.40

272.40

14.70

Appearance and Dimensions

Figure 1-1 Front View (unit: mm)

Figure 1-2 Top View (unit: mm)

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RIGOL Chapter 1 Quick Start

85.51

112

Figure 1-3 Side View (unit: mm)

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Chapter 1 Quick Start RIGOL

Restore the instrument to the preset state (the factory

3.5 inch TFT high-resolution (320×240) color LCD. The

Interface".

Front Panel Overview

The front panel of DSG800 series RF signal generator is as shown in the figure below. You can click the number in the figure to view the corresponding introduction.

1 2 3 4 5 6 7

1. Restore to Preset Key

2. LCD

8 9 10 11 12 13 14 15

default state or user-stored state). For the detailed information, refer to "

current settings and state of the instrument can be clearly displayed. For the detailed information, refer to "

Figure 1-4 Front Panel

Reset".

User

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RIGOL Chapter 1 Quick Start

Display switching key. In the menu page of any function,

selected. In addition, you can press any function key to exit

Menu softkeys corresponding to the menus displayed at the

Menu page up/down key.

Set the frequency parameters of the RF output signal as Set the amplitude parameters of the RF output signal and

Set the sweep type, sweep manner, sweep mode and etc.

Set the related parameters of amplitude modulation (AM),

refer to "Modulation".

3. Menu Control Keys

4. Function Keys

you can press this key to open the parameter information display interface of the current function. At this point, you can use the knob or arrow keys to switch the parameter tabs to view the parameter information of different functions. Pressing this key again will switch to the function menu corresponding to the parameter tab currently

the parameter information display interface.

left of the softkeys respectively. Pressing the softkey will activate the corresponding menu.

well as the related parameters of LF output. For the detailed information, refer to "

To Set the Frequency/LF

Parameters".

provide the flatness calibration function. For the detailed information, refer to "

Parameters

To Set the Amplitude

For the detailed information, refer to "Sweep".

frequency modulation (FM), phase modulation (ØM), pulse modulation and pulse generator as well as I/Q modulation and I/Q modulation source. For the detailed information,

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Chapter 1 Quick Start RIGOL

The numeric keyboard supports Chinese characters, English uppercase

The multiplexing keys of the numbers and letters are used to directly input the

Used to switch among Chinese, English and number input In number input mode, press this key to input 1.

The multiplexing key of 0 and space. In number input mode, press this key to insert a decimal

In Chinese input mode, this key is invalid.

When setting a parameter, the knob is used to modify the

switch the parameter tabs.

5. Numeric Keyboard

/lowercase characters, numbers and commonly used symbols (include the decimal point, #, space and positive/negative sign +/-). It is mainly used to edit the file or folder name and set the parameters.

desired numbers or letters.

modes. When setting a parameter, the input mode is fixed at number and this key is used to input the sign ("+" or "-") of the value.

In English input mode, press this key to switch between uppercase and lowercase letter inputs.

In number input mode, press this key to input 0. In Chinese or English input mode, press this key to input a space.

point at the current cursor position. In English input mode, press this key to input "#".

6. Knob

value at the cursor or modify the parameter value at the current step. When editing a filename, it is used to select the desired character. For the storage function, it is used to select the current directory or file. In the parameter information display interface, it is used to

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RIGOL Chapter 1 Quick Start

When setting a parameter, Step is used to set the step of

keys are used to switch the parameter tabs.

It is used to turn on or off the RF signal generator. You can

due to misoperation.

Store and recall various types of files (such as the

Set the system-related parameters. For the detailed

7. Arrow Keys/Step Key

the parameter currently selected; the arrow keys are used to enter the parameter editing state and move the cursor to the specified digit. For the storage function, the arrow keys are used to collapse and expand the directory currently selected. When editing a filename, the arrow keys are used to select the desired character. In the parameter information display interface, the arrow

8. Power Key

use the following method to enable or disable this key. Press Syst  Pwr Status to select "Default" or "Open". When "Default" is selected, you need to press this key to start the instrument after the instrument is powered on. When "Open" is selected, the instrument will start automatically after it is powered on.

Besides, this key provides the delayed switching function (namely, the instrument can be turned on or off only when you press this key and hold it down for a certain period of time) to avoid the shut-down of the instrument

9. Store and Recall Key

instrument state). For the detailed information, refer to "

Store and Recall".

10. System Setting Key

information, refer to "To Set the System Parameters".

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Chapter 1 Quick Start RIGOL

Used to turn on or off the RF output.

Used to turn on or off the RF modulation output.

turned off.

To get the help information of any front panel key or

key.

When setting a parameter, this key is used to clear the

exit the current menu and return to the previous menu.

11. Output Control Keys

— Press this key; the backlight of the key and the RF

label in the function status area in the user interface are illuminated. At this point, the RF output is turned on and the [RF OUTPUT 50Ω] connector outputs RF signal according to the current configuration.

— Press this key again; the backlight of the key turns off

and the RF label in the function status area in the user interface is grayed out. At this point, the RF output is turned off.

— When a modulation function (AM, FM, ØM, Pulse Mod

or I/Q Mod) is turned on, press this key; the backlight of the key and the MOD label in the function status area in the user interface are illuminated. At this point, the RF modulation output is turned on and the [RF OUTPUT 50Ω] connector outputs the modulated RF signal according to the current configuration (the backlight of RF/on must be illuminated).

— Press this key again and the backlight of the key

turns off. At this point, the RF modulation output is

12. Built-in Help System

menu softkey, press this key and then press the desired

13. Exit Key

number in the editing window and exit the parameter input state. When editing a filename, this key is used to clear the characters in the input bar. In the keyboard test state, this key is used to exit the current test state. When the instrument is working in the remote mode, you can press this key to return to the local mode. After you select the next level of menu, this key is used to

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RIGOL Chapter 1 Quick Start

When the LF output is turned on, this connector is used to

When the backlight of RF/on is illuminated, this

modulated signal.

CAUTION

To avoid damaging the instrument, the reverse DC voltage on the

segment.

14. LF Output Connector

output the LF signal.

15. RF Output Connector

connector is used to output the RF signal and RF sweep signal. When the backlights of RF/on and Mod/on are both illuminated, this connector is used to output the RF

RF output connector cannot exceed 50 V and the reverse power cannot exceed +30 dBm (1W) in the 1 MHz to 3.6 GHz frequency

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Chapter 1 Quick Start RIGOL

The function of this connector is determined by the

When the pulse modulation source is "Int" and the pulse

set to "Single" or "Train".

Rear Panel Overview

The rear panel of DSG800 series RF signal generator is as shown in the figure below. You can click the number in the figure to view the corresponding introduction.

1 2 3 4 5

6 7 8 9 10 11 12

Figure 1-5 Rear Panel

1. Pulse Signal Input/Output Connector

current working mode of pulse modulation.

PULSE IN:

When the pulse modulation source is "Ext", this

DSG800 User Guide 1-11

connector is used to input the external pulse signal.

PULSE OUT:

output is turned on, this connector is used to output the pulse signal generated by the internal generator. This output signal is related to the pulse "Mode" and can be

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RIGOL Chapter 1 Quick Start

When the modulation source of AM or FM/ØM is

When the RF output frequency or amplitude is

stable (namely, the signal is valid).

3.3V

Power-on Time

RF Valid

Configuration

Time

Configuration

Time

RF Valid

… …

2. External Modulation Input Connector

set to "Ext", this connector is used to input the external modulating signal.

3. Signal Valid Output Connector

modified, after a certain response and processing time of the internal circuit of the instrument, the instrument outputs RF signal with the specified frequency and amplitude via the RF output connector at the front panel. During this process, the [SIGNAL VALID] connector outputs a pulse sync signal, indicating that the RF output signal is valid.

— High Level (+3.3 V): indicate that the RF

signal is in configuration.

— Low Level (0 V): indicate that the RF signal is

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Chapter 1 Quick Start RIGOL

When the trigger mode of SWEEP is “Ext”, this

Power input connector.

When the I/Q modulation source is "Ext", it is

When the I/Q modulation source is "Ext", it is It is used to output the I (In-Phase) components

4. External Trigger Input Connector

connector is used to input the external trigger signal. You can press Trig Slope to set the polarity of the trigger signal to "Pos" or "Neg". When the trigger mode of I/Q modulation baseband output is "Ext", this connector is used to input the external trigger signal. When the pulse modulation source is "Int" and the trigger mode is "Ext Trig", it is used to input the external trigger signal. When the pulse modulation source is "Int" and the trigger mode is "Ext Gate", it is used to input the external gated signal.

5. Power Input Connector

This RF signal generator can accept 100 V to 240 V, 45 Hz to 440 Hz AC power supplies. The power consumption of the instrument cannot exceed 60 W.

6. I/Q Modulating Signal Input/Output Connectors (only available for

DSG821A/DSG836A)

used to input the I (In-Phase) baseband signal of I/Q modulation.

used to input the Q (Quadrature Phase) baseband signal of I/Q modulation.

of I/Q modulation of the built-in baseband generator.

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RIGOL Chapter 1 Quick Start

It is used to output the Q (Quadrature Phase)

It is used to output the internal 10 MHz reference

It is used to input the external 10 MHz reference

data sheet of this product.

The instrument complies with LXI Core 2011 The instrument complies with USBTMC class

This interface is used to connect the PC for remote

components of I/Q modulation of the built-in baseband generator

7. Reference Signal Output Connector

clock signal which is used to synchronize the generator with other instruments. For more information about the specifications of the clock signal output from this connector, refer to the data sheet of this product.

8. Reference Signal Input Connector

clock signal which is used to synchronize the generator with other instruments. For more information about the specifications of the external clock signal input from this connector, refer to the

9. LAN

10. USB DEVICE

Device standard. It supports WebServer, Socket and other remote control modes. This interface is used to connect the RF signal generator to the PC or network for remote control.

protocol.

control.

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Chapter 1 Quick Start RIGOL

This interface is used to connect the USB storage

OCXO is an oven controlled crystal oscillator. It is

please refer to the data sheet of this product.

11. USB HOST

device to update the system or store the system states and etc.

12. OCXO (Option OCXO-B08)

a frequency reference source with higher temperature stability.

Note: Sixty minutes of warm-up is required for

the OCXO to reach its rated frequency.

For the ordering information of this option,

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RIGOL Chapter 1 Quick Start

CAUTION

To Use DSG800 for the First Time

To Connect the Power Supply

Please connect the RF signal generator to AC power supply using the power cable supplied in the accessories. This RF signal generator can accept 100 V to 240 V, 45 HZ to 440 Hz AC power supplies. The power consumption of the instrument cannot exceed 60 W. When the RF signal generator is connected to AC power supply via this connector, the instrument selects the correct voltage range automatically and users do not need to select the voltage range manually.

To avoid electric shock, use the standard power cable.

Power-on Inspection

After the power supply is correctly connected, press the power key panel to turn on the RF signal generator. During the start-up, the instrument performs initialization and self-test. After that, the instrument enters the default interface.

at the front

To Set the System Language

DSG800 series RF signal generator supports multiple system languages. You can press Syst  Language to switch the system language.

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Chapter 1 Quick Start RIGOL

User Interface

The user interface of DSG800 series RF signal generator is shown in the figure below.

1 2 3 4

5 6

Figure 1-6 User Interface

1. Frequency Area

Display the current frequency settings of the RF signal generator.

— — — — —

2. Amplitude Area

Display the current level settings of the RF signal generator.

— —

: continuous sweep label. It is displayed when the sweep manner is

"Freq" or "Freq & Lev" and the sweep mode is "Cont".

: single sweep label. It is displayed when the sweep manner is "Freq"

or "Freq & Lev" and the sweep mode is "Single".

: forward sweep label. It is displayed when the sweep manner is "Freq"

or "Freq & Lev" and the sweep direction is "Fwd".

: downward sweep label. It is displayed when the sweep manner is

"Freq" or "Freq & Lev" and the sweep direction is "Down".

: frequency sweep progress bar. It is displayed when the

sweep manner is "Freq" or "Freq & Lev".

: displayed when the flatness calibration is turned "On". : continuous sweep label. It is displayed when the sweep manner is

"Level" or "Freq & Lev" and the sweep mode is "Cont".

: single sweep label. It is displayed when the sweep manner is "Level"

or "Freq & Lev" and the sweep mode is "Single".

: forward sweep label. It is displayed when the sweep manner is

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RIGOL Chapter 1 Quick Start

Icon

Explanation

Icon

Explanation

The RF output is not turned

selected.

The LF output is not

waveform is selected.

The RF output is not turned

manner is selected.

The LF output is not

waveform is selected.

The RF output is turned on

selected.

The LF output is turned

selected.

The RF output is turned on

manner is selected.

The LF output is turned

is selected.

"Level" or "Freq & Lev" and the sweep direction is "Fwd".

—

: downward sweep label. It is displayed when the sweep manner is

"Level" or "Freq & Lev" and the sweep direction is "Down".

—

: amplitude sweep progress bar. It is displayed when the

sweep manner is "Level" or "Freq & Lev".

3. Status Bar

Indicate the current system states of the RF signal generator.

— —

: the RF signal generator is working in the remote control mode.

: the RF signal generator is working in the local operation mode.

: displayed when a USB storage device is detected.

: displayed when the instrument parameter information interface is

opened.

4. Menu Display Area

The menu items displayed in this area correspond to the softkeys at the right of the screen respectively. Pressing any softkey can enable the corresponding menu function.

5. Message Display Area

Display the operation error messages and prompt messages. You can press Syst  Information  System Msg to view the messages. When multiple messages are generated, you can use the arrow keys or knob to select the desired message.

6. Function Status Area

Display the current states of the functions of the RF signal generator. The status icons that might be displayed in the function status area are as shown in the table below.

on and no sweep manner is

turned on and Sine

on and only a single sweep

and no sweep manner is

turned on and Square

on and Sine waveform is

and only a single sweep

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on and Square waveform

Chapter 1 Quick Start RIGOL

The RF modulation output

AM is turned on.

The RF modulation

AM is turned on.

The RF modulation output

FM is turned on.

The RF modulation

FM is turned on.

The RF modulation output

ØM is turned on.

The RF modulation

ØM is turned on.

The RF modulation output

Pulse is turned on.

The RF modulation

Pulse is turned on.

The RF modulation output

is turned on.

The RF modulation

IQ is turned on.

The RF modulation output

FM are turned on.

The RF modulation

and FM are turned on.

The RF modulation output

ØM are turned on.

The RF modulation

and ØM are turned on.

The RF modulation output

Pulse are turned on.

The RF modulation

and Pulse are turned on.

The RF modulation output

Pulse are turned on.

The RF modulation

and Pulse are turned on.

The RF modulation output

are turned on.

The RF modulation

and IQ are turned on.

The RF modulation output

Pulse are turned on.

The RF modulation

and Pulse are turned on.

The RF modulation output

are turned on.

The RF modulation

and IQ are turned on.

The RF modulation output

Pulse are turned on.

The RF modulation

and Pulse are turned on.

The RF modulation

on.

is not turned on and only

is not turned on and only IQ

is not turned on; AM and

output is turned on and

output is turned on; AM

is not turned on; FM and

is not turned on; FM and IQ

is not turned on; ØM and

is not turned on; ØM and IQ

is not turned on; IQ and

The RF modulation output is not turned on; AM, FM and Pulse are turned on.

The RF modulation output is not turned on; AM, ØM

DSG800 User Guide 1-19

output is turned on; FM

output is turned on; ØM

output is turned on; IQ

output is turned on; AM, FM and Pulse are turned

The RF modulation output is turned on; AM,

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RIGOL Chapter 1 Quick Start

and Pulse are turned on.

ØM and Pulse are turned

The RF modulation

on.

The RF modulation

on.

The RF modulation output

is turned on.

on.

The RF modulation output is not turned on; FM, IQ and Pulse are turned on.

The RF modulation output is not turned on; ØM, IQ and Pulse are turned on.

is not turned on and none of the modulation functions

-- --

output is turned on; FM, IQ and Pulse are turned

output is turned on; ØM, IQ and Pulse are turned

Tip: Press MOD and the AM/FM/ØM/PUL/IQ modulation icons are displayed in the function status area. If a modulation function is turned on (or off), the corresponding icon will be illuminated (or grayed out).

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Chapter 1 Quick Start RIGOL

To Use the Built-in Help System

The DSG800 built-in help system provides the help information of all the function keys and menu softkeys at the front panel. Users can view the help information of any key when operating the instrument.

1. Acquire the built-in help information

Press ? and press the desired function key or menu softkey; the help information of the key will be displayed in the instrument interface.

2. Page up/down

When the help information is displayed in multiple pages, you can use the arrow keys or knob to switch the help information page.

3. Turn off the current help information

When help information is displayed in the instrument interface, pressing any key (except the arrow keys and knob) at the front panel will turn off the help information currently displayed.

4. Acquire the help information of a menu softkey

Press ? and the prompt message about how to acquire the help information is displayed in the instrument interface. Then, press the desired menu softkey and the help information of the menu item corresponding to this menu softkey is displayed in the instrument interface.

5. Acquire the help information of any function key

Press ? and the prompt message about how to acquire the help information is displayed in the instrument interface. Then, press the desired function key and the help information of the function of the key is displayed in the instrument interface.

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Chapter 2 Front Panel Operations RIGOL

Chapter 2 Front Panel Operations

This chapter introduces each function key at the front panel as well as the menu functions under it in details.

The topics of this chapter:

 To S e t the Frequency/LF Parameters  To Set the Amplitude Parameters  Sweep  Modulation  Store and Recall  To Set the System Parameters

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RIGOL Chapter 2 Front Panel Operations

To Set the Frequency/LF Parameters

Frequency

Set the RF output frequency.

Press FREQ, use the numeric keyboard to input the frequency value and select the desired unit from the pop-up unit menu.

 The frequency units available are GHz, MHz, kHz and Hz.  You can press Backspace to delete the number at the left of the cursor.  You can press the left/right arrow key to enter the parameter editing state and

move the cursor to the specified digit; then, rotate the knob to modify the value.

 After the frequency is set, you can rotate the knob to modify the frequency at

the current step.

 You can press FREQ and then press Step to set the step.

LF Output

LF output denotes the output of the low-frequency signal generated by the internal generator of the RF signal generator. The LF output can be one of the two commonly used waveforms (sine or square). You can set the frequency and amplitude of the low-frequency signal.

Press FREQ  LF to enter the LF output parameter setting menu.

To Turn on the LF Output

Press FREQ  LF  Switch to turn "On" or "Off" the LF output. When "On" is selected, the LF label and the label of the waveform currently selected (Sine or Square) in the function status area of the user interface are illuminated. At this point, the [LF OUTPUT] connector (as shown in the figure below) outputs the LF signal according to the current configuration.

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Chapter 2 Front Panel Operations RIGOL

Explanation

The settable range of square frequency is from 0 Hz to 20 kHz.

To Select the LF Waveform

Press FREQ  LF  Waveform to set the waveform of the LF output signal to "Sine" or "Square". The default is "Sine".

To Set the LF Amplitude

Press FREQ  LF  Level to set the amplitude of the LF signal.

 Use the numeric keyboard to input the amplitude value and select the desired

unit from the pop-up unit menu.

 The amplitude units available are V, m V, uV, nV and dBm.  You can press Backspace to delete the number at the left of the cursor.  You can press the left/right arrow key to enter the parameter editing state and

move the cursor to the specified digit; then, rotate the knob to modify the value.

 You can also rotate the knob to modify the amplitude at the current step.  You can press Step to set the step.  The settable ranges of the amplitudes of sine and square are both from 0 V to 3

V. Note that when the frequency is 0 Hz, the LF output is DC signal and the settable range of the amplitude is from -3 V to 3 V.

To Set the LF Frequency

Press FREQ  LF  Freq to set the frequency of the LF signal.

 Use the numeric keyboard to input the frequency value and select the desired

unit from the pop-up unit menu.

move the cursor to the specified digit; then, rotate the knob to modify the value.

 After the frequency is set, you can rotate the knob to modify the frequency at

the current step.

 You can press Step to set the step.

The settable range of sine frequency is from 0 Hz to 200 kHz.

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RIGOL Chapter 2 Front Panel Operations

To Set the Amplitude Parameters

Amplitude

Set the RF output amplitude.

Press LEVEL, use the numeric keyboard to input the amplitude value and select the desired unit from the pop-up unit menu.

 The amplitude units available are dBm, -dBm, mV, uV a n d n V.  You can press Backspace to delete the number at the left of the cursor.  You can press the left/right arrow key to enter the parameter editing state and

move the cursor to the specified digit; then, rotate the knob to modify the value.

 You can also rotate the knob to modify the amplitude at the current step.  You can press LEVEL and then press Step to set the step.

Flatness Calibration

The flatness calibration function can adjust the RF output amplitudes corresponding to the frequency points within the frequency range of the instrument to compensate for the external loss caused by the cables, switches or other devices. You can load the flatness calibration lists stored in the internal or external memory to DSG800 and view the list contents.

1. Set the flatness calibration status

Press LEVEL  Flatness  Switch to turn "On" or "Off" the flatness calibration function. When the flatness calibration function is turned on, the UF status label is displayed in the amplitude area of the user interface.

2. Flatness calibration list

Press LEVEL  Flatness  Cal List to enter the flatness calibration list menu.

 Load a list

Press Load to open the store and recall interface. At this point, you can select and read the flatness calibration list files stored. For the detailed operations, refer to " directory of the file loaded is displayed in View. The format of the calibration list file loaded is as shown in the table below. Note that while you edit the value in the flatness calibration list, if no unit is added, then the default frequency unit is mHz and the default amplitude unit is dB.

Store and Recall". After a list is loaded, the storage

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Chapter 2 Front Panel Operations RIGOL

Freq

Level

[1]

207.854 000 00 MHz

-70.50 dB

304.000 000 00 MHz

7.45 dB

800.000 000 00 MHz

-17.80 dB

[1]

Note

frequency point, only the actual output amplitude will be affected and the amplitude display value will not change.

: Amplitude calibration value. When calibrating the amplitude of the current

 View the list

You can press View to view the information of the flatness calibration list currently loaded. Pressing any key (except the arrow keys and knob) at the front panel will return to the flatness calibration list menu.

Note: This menu is only valid after a list file is loaded.

Amplitude Unit

Set the unit of the RF output amplitude.

Press LEVEL  Level Unit and select the desired unit from the pop-up unit menu. The output amplitude units available are dBm, dBmV, dBuV, Volts and Watts. Wherein, dBm, dBmV and dBuV are logarithmic units; Volts and Watts are linear units. The default is dBm.

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RIGOL Chapter 2 Front Panel Operations

Sweep

When the sweep function is turned on, the RF signal generator outputs RF sweep signal from the [RF OUTPUT 50Ω] connector (as shown in the figure below) at the front panel (at this point, the RF output should be turned on).

Sweep Manner

DSG800 provides three sweep manners ("Freq", "Level" and "Freq & Lev"). The sweep function is turned on when any of the sweep manners is selected and the Sweep label in the function status area of the user interface is illuminated. By default, the sweep function is turned off.

Press SWEEP  Sweep to select the desired sweep manner.

 Off: the default state. Turn off the sweep function.  Freq: turn on the frequency sweep function. At this point, the frequency sweep

progress bar is displayed in the frequency area in the user interface.

 Level: turn on the amplitude sweep function. At this point, the amplitude sweep

progress bar is displayed in the amplitude area in the user interface.

 Freq & Lev: turn on the frequency and amplitude sweep functions at the same

time. At this point, the frequency and amplitude sweep progress bars are displayed in the frequency and amplitude areas in the user interface respectively.

Sweep Direction

Press SWEEP and use the menu page up/down key the menu; then, press Direct to select "Fwd" or "Down" and the default is "Fwd".

 Fwd: the RF signal generator sweeps from the start frequency or start level to

the stop frequency or stop level. The progress bars in the frequency area and amplitude area in the user interface sweep from left to right.

 Down: the RF signal generator sweeps from the stop frequency or stop level to

the start frequency or start level. The progress bars in the frequency area and amplitude area in the user interface sweep from right to left.

to open the 3/3 page of

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Chapter 2 Front Panel Operations RIGOL

Freq

Level

[1]

Time

[2]

2.000 000 000 10 GHz

-10.00 dBm

500.00 ms

1.994 152 687 00 GHz

-50.00 dBm

500.00 ms

1.888 000 000 00 GHz

-60.85 dBm

500.00 ms

Sweep Type

DSG800 provides two sweep types ("List" and "Step") and the default is "Step".

List Sweep

1. Select the list sweep mode

Press SWEEP  Type to select "List". At this point, the RF signal generator sweeps according to the sweep list currently loaded.

2. Sweep list

Press SWEEP and use the page up/down key menu; then, press List Swp to enter the sweep list menu.

 Load a list

Press Load to open the store and recall interface. At this point, you can select and read the sweep list files stored. For the detailed operations, refer

Store and Recall". After a list is loaded, the storage directory of the

to " file loaded is displayed in View. The format of the sweep list file loaded is as shown in the table below. Note that when you edit the value in the sweep list, the unit must be added. If no unit is added, then you may fail to load the list.

to open the 2/3 page of the

[1]

Note Note

: The amplitude corresponding to the frequency point set.

[2]

: The duration of a sweep step.

 View the list

You can press View to view the information of the sweep list currently loaded. Pressing any key (except the arrow keys and knob) at the front panel will return to the sweep list menu.

Note: This menu is only valid after a list file is loaded.

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RIGOL Chapter 2 Front Panel Operations

Explanation

Freq" or "Stop Freq".

Step Sweep

1. Select the step sweep mode

Press SWEEP  Type to select "Step". At this point, the RF signal generator performs step sweep according to the current settings.

2. Set the sweep parameters

Press SWEEP and use the menu page up/down key of the menu; then, press Step Swp to set the sweep parameters, such as the start frequency, stop frequency, start level, stop level and number of sweep points.

 Start Frequency

Press Start Freq, use the numeric keyboard to input the start frequency value and select the desired unit from the pop-up unit menu. You can press Backspace to delete the number at the left of the cursor.

 Stop Frequency

Press Stop Freq, use the numeric keyboard to input the stop frequency value and select the desired unit from the pop-up unit menu. You can press Backspace to delete the number at the left of the cursor.

to open the 2/3 page

The start frequency and stop frequency are the frequency upper and lower limits of frequency sweep respectively.

 When the sweep direction is forward, the RF signal generator

sweeps from the start frequency to the stop frequency.

 When the sweep direction is downward, the RF signal generator

sweeps from the stop frequency to the start frequency. When the "Start Freq" or "Stop Freq" is modified, the RF signal generator will restart the sweep and output from the specified "Start

 Start Level

Press Start Lev, use the numeric keyboard to input the start level value and select the desired unit from the pop-up unit menu. You can press Backspace to delete the number at the left of the cursor.

 Stop Level

Press Stop Lev, use the numeric keyboard to input the stop level value and select the desired unit from the pop-up unit menu. You can press Backspace to delete the number at the left of the cursor.

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Chapter 2 Front Panel Operations RIGOL

Explanation

The start level and stop level are the amplitude upper and lower limits of

Lev".

amplitude sweep respectively.

 When the sweep direction is forward, the RF signal generator

sweeps from the start level to the stop level.

 When the sweep direction is downward, the RF signal generator

sweeps from the stop level to the start level. When the "Start Lev" or "Stop Lev" is modified, the RF signal generator will restart the sweep and output from the specified "Start Lev" or "Stop

 Number of Sweep Points

Press Points, use the numeric keyboard to input the number of sweep points and then press Enter. You can press Backspace to delete the number at the left of the cursor.

 Dwell Time

The dwell time denotes the duration of a sweep step.

Press Dwell Time, use the numeric keyboard to input the time value and select the desired unit from the pop-up unit menu. You can press Backspace to delete the number at the left of the cursor.

 Sweep Space

The sweep space denotes the mode in which the instrument changes from one frequency or amplitude to another within one step.

Press Swp Space to select "Log" or "Lin" sweep space. Note that level sweep only supports "Lin" sweep space.

 Sweep Shape

The sweep shape denotes the cycle mode of multiple sweeps.

Press Shape to select "Ramp" or "Triangle" sweep shape. When the sweep direction is "Fwd", the "Ramp" and "Triangle" sweep shapes are as shown in the figure below.

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F/L

Start Frequency

/Start Level

Start Frequency

/Start Level

Ramp

Triangle

Stop Frequency

/Stop Level

Stop Frequency

/Stop Level

RIGOL Chapter 2 Front Panel Operations

Ramp: the sweep period always starts from the start frequency or start level to the stop frequency or stop level and the sweep sequence is similar to a ramp waveform. Triangle: the sweep period always starts from the start frequency or start level to the stop frequency or stop level and then returns back to the start frequency or start level. The sweep sequence is similar to a triangle waveform.

Sweep Mode

Press SWEEP  Mode to select "Cont" or "Single" sweep and the default is "Cont".

 Cont: when continuous sweep is selected, the continuous sweep label is

displayed in the frequency or amplitude area in the user interface. When the trigger condition is met, the instrument sweeps continuously according to the current setting.

 Single: when single sweep is selected, the single sweep label is displayed in the

frequency or amplitude area in the user interface. When the trigger condition is met, the instrument performs a single sweep according to the current setting and then stops.

Single Sweep

If the current sweep mode is "Cont", press Single to switch the sweep mode to "Single" and the instrument will perform a single sweep if the trigger condition is

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Chapter 2 Front Panel Operations RIGOL

met. If the current sweep mode is "Single", press Single and the instrument will perform a single sweep if the trigger condition is met.

To Reset the Sweep

If the current sweep direction is "Fwd", press Reset Swp, the instrument stops the current sweep and restarts the sweep from the start frequency or start level. If the current sweep direction is "Down", press Reset Swp, the instrument stops the current sweep and restarts the sweep from the stop frequency or stop level.

Trigger Mode

1. Trigger Mode

Select the trigger mode of the whole sweep period.

Press SWEEP and use the menu page up/down key of the menu; then, press Trig Mode to select "Auto", "Key", "Bus" or "Ext" trigger.

Note: The following descriptions are valid when the trigger mode of each sweep

point in the sweep period is met.

 Auto Trigger

The default mode is auto. If the sweep mode is set to "Cont", the instrument will start sweeping once a sweep manner is selected. If the sweep mode is set to "Single", you need to press Single to meet the single sweep condition; after that, the instrument will start a sweep and then stops.

 Key Trigger

When "Key" trigger is selected, if the sweep mode is set to "Cont", the instrument starts a sweep each time Key Trig is pressed; if the sweep mode is set to "Single", you need to press Single to meet the single sweep condition and after that, the instrument starts a sweep and then stops each time Key Trig is pressed.

 Bus Tr i g g er

When "Bus" trigger is selected, if the sweep mode is set to "Cont", the instrument starts a sweep each time the "*TRG" command is sent; if the sweep mode is set to "Single", you need to press Single to meet the single sweep condition and after that, the instrument starts a sweep and then

to open the 2/3 page

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RIGOL Chapter 2 Front Panel Operations

stops each time the "*TRG" command is sent.

 External Trigger

In external trigger, the RF signal generator receives the trigger signal input from the [TRIGGER IN] connector (as shown in the figure on the next page) at the rear panel. If the sweep mode is set to "Cont", the instrument starts a sweep each time a TTL pulse signal with the specified polarity is received. If the sweep mode is set to "Single", you need to press Single to meet the single sweep condition; after that, the instrument starts a sweep and then stops each time a TTL pulse signal with the specified polarity is received.

To specify the polarity of the TTL pulse signal, press Trig Slope to select "Pos" or "Neg" and the default is "Pos".

2. Point Trigger Mode

Select the trigger mode of each sweep point in a sweep period.

Press SWEEP and use the menu page up/down key

to open the 2/3 page

of the menu; then, press Point Trig to select "Auto", "Key", "Bus" or "Ext" trigger.

Note: The following descriptions are valid when the trigger mode of the

corresponding sweep period is met.

 Auto Trigger

The default mode is auto. If the sweep mode is set to "Cont", the instrument will start sweeping each sweep point continuously within a sweep period once a sweep manner is selected. If the sweep mode is set to "Single", you need to press Single to meet the single sweep condition; after that, the instrument starts to sweep and then stops after the sweep period expires.

 Key Trigger

When "Key" trigger is selected, if the sweep mode is set to "Cont", the instrument starts to sweep a point each time Key Trig is pressed; if the sweep mode is set to "Single", you need to press Single to meet the single sweep condition and after that, the instrument starts to sweep a point and then stops after the sweep period expires each time Key Trig is pressed.

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Chapter 2 Front Panel Operations RIGOL

Explanation

When executing the sweep operation, the priority order of the conditions is

Point Trigger Mode. For example, when

instrument starts to sweep.

 Bus Tr igg e r

When "Bus" trigger is selected, if the sweep mode is set to "Cont", the instrument starts to sweep a point each time the "*TRG" command is sent; if the sweep mode is set to "Single", you need to press Single to meet the single sweep condition and after that, the instrument starts to sweep a point and then stops after the sweep period expires each time the "*TRG" command is sent.

 External Trigger

In external trigger mode, the RF signal generator receives the trigger signal input from the [TRIGGER IN] connector (as shown in the figure below) at the rear panel. If the sweep mode is set to "Cont", the instrument starts to sweep a point each time a TTL pulse signal with the specified polarity is received. If the sweep mode is set to "Single", you need to press Single to meet the single sweep condition; after that, the instrument starts to sweep a point and then stops after the sweep period expires each time a TTL pulse signal with the specified polarity is received.

To specify the polarity of the TTL pulse signal, press Trig Slope to select "Pos" or "Neg" and the default is "Pos".

Single Sweep  Trigger Mode  both the trigger mode and point trigger mode are set to "Key" trigger:

 In "Cont" sweep mode, you need to press Key Trig to meet the

trigger mode of the whole period and then press Key Trig again to meet the trigger mode of the points within the sweep period; then, the instrument starts to sweep.

 In "Single" sweep mode, you need to press Single to meet the single

sweep condition and then press Key Trig twice to meet the sweep period trigger mode and point trigger mode respectively; then, the

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RIGOL Chapter 2 Front Panel Operations

Modulation

Amplitude Modulation (AM)

During amplitude modulation (AM), the modulating signal changes the amplitude of the RF carrier waveform linearly.

Press MOD  AM to enter the amplitude modulation parameter setting menu.

To Turn on Amplitude Modulation

Press Switch to select "On" or "Off".

 On: turn on the AM function. The AM label in the function status area in the user

interface is illuminated.

 Off: turn off the AM function and this is the default state.

Note: If a sweep manner is selected and the step sweep time is lower than 30 ms,

"You can turn on the AM when sweep time is greater than 30ms" will be displayed in the user interface when amplitude modulation is turned on.

To Select the Modulation Source

Press Source to select "Int" or "Ext" modulation source.

1. Internal Source

When "Int" is selected, the internal modulation source is turned on. At this point, the instrument provides the modulating signal and you can set the modulation frequency and modulation waveform of the modulating signal.

2. External Source

When "Ext" is selected, Freq and Waveform are grayed out and disabled. The RF signal generator receives the external modulating signal input from the [EXT MOD IN] connector (as shown in the figure below) at the rear panel. This modulating signal can be any waveform.

Note: The input amplitude of the external modulating signal cannot exceed

+/-3 V (HighZ). To ensure the modulation performance, the input amplitude of the external modulating signal should be less than 1 Vpp.

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Chapter 2 Front Panel Operations RIGOL

ΔP

asb

mΔP lg206 −=

To Set the Modulation Depth

The modulation depth denotes the extent of output amplitude variation and is expressed as a percentage. The range of AM modulation depth is from 0% to 100%.

Press Depth to set the AM modulation depth.

1. When "Int" modulation source is selected

The AM modulation depth ( the carrier and sidebands satisfy the following relation.

 When the modulation depth is 0%, the instrument outputs a carrier signal

with a single frequency point.

 The greater the modulation depth is, the smaller the difference between the

output amplitude and carrier amplitude will be.

2. When "Ext" modulation source is selected

 100% modulation depth refers to the modulation depth corresponding to 1

Vpp input amplitude of the external modulation source.

 When the input amplitude of the external modulation source is 0.5 Vpp, the

modulation depth actually measured is 50%.

) and the amplitude difference (

) between

To Select the Modulation Waveform

Press Source to select "Int" modulation source; press Waveform to select "Sine" or "Square" and the default is "Sine".

Note: When "Ext" modulation source is selected, this menu is grayed out and

disabled.

To Set the Modulation Frequency

Press Source to select "Int" modulation source; press Freq to set the modulation frequency.

 Use the numeric keyboard or knob to input the desired frequency value.  For sine waveforms, the range of the modulation frequency is from 10 Hz to 100

kHz.

 For square waveforms, the range of the modulation frequency is from 10 Hz to

20 kHz.

Note: When "Ext" modulation source is selected, this menu is grayed out and

disabled.

DSG800 User Guide 2-15

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RIGOL Chapter 2 Front Panel Operations

External Coupling

Press EXT Coup to select "AC" or "DC" coupling and the default is "AC".

 When "AC" is selected: the DC components of the external signal input from the

[EXT MOD IN] connector at the rear panel of the instrument will be blocked and the AC components can pass through the connector.The external modulation input port is similar to a high-pass filter which low cutoff frequency is less than 5 Hz.

 When "DC" is selected: all the AC components and DC components of the

external input signal can pass through the connector.

Note: When "Int" modulation source is selected, this menu is grayed out and

disabled.

Input Impedance

Press Impedance to select "50ohm", "600ohm" or "100kohm ". You can set the impedance of the [EXT MOD IN] input channel.

Note: When "Int" modulation source is selected, this menu is grayed out and

disabled.

2-16 DSG800 User Guide

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Chapter 2 Front Panel Operations RIGOL

Frequency Modulation (FM)

During frequency modulation (FM), the modulating signal changes the frequency of the RF carrier waveform.

Press MOD  FM/ØM to enter the frequency/phase modulation parameter setting menu.

To Turn on Frequency Modulation

Press FM/ØM to select "FM" and then press Switch to select "On" or "Off".

 On: turn on the FM function. The FM label in the function status area in the user

interface is illuminated.

 Off: turn off the FM function and this is the default state.

Note: The frequency modulation and phase modulation cannot be turned on at the

same time. In addition, if a sweep manner is selected and the step sweep time is lower than 200 ms, "You can turn on the FM or ØM when sweep time is greater than 200ms" will be displayed in the user interface when frequency modulation is turned on.