Rigol DSA815 User guide

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RIGOL

User’s Guide

DSA800 Series

Spectrum Analyzer

Dec. 2011

RIGOL Technologies, Inc.

RIGOL

Guaranty and Declaration

Trademark Information

RIGOL is a registered trademark of RIGOL Technologies, Inc.

Publication Number

UGD03103-1110

Notices

 RIGOL products are protected by patent law in and outside of P.R.C.  RIGOL Technologies, Inc. reserves the right to modify or change parts of or

all the specifications and pricing policies at company’s sole decision.

 Information in this publication replaces all previously corresponding material.  RIGOL shall not be liable for losses caused by either incidental or

consequential 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 or photocopied or

rearranged without prior written approval of RIGOL.

Product Certification

RIGOL guarantees this product conforms to the national and industrial standards

in China. International standard conformance certification is in progress, e.g. ISO. At present the analyzer has passed CE, PictBridge, LXI and cTUVus certification.

If you have any problem or requirement when using our products, please contact RIGOL Technologies, Inc. or your local distributors, or visit: www.rigol.com

User’s Guide for DSA800 Series

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 injuries or damages to the instrument and any product connected to it. To prevent potential hazards, please use the instrument only specified by this manual.

Use Proper Power Cord

Only the power cord designed for the instrument and authorized by 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, it is essential to connect the earth terminal of power cord to the Protective Earth terminal before any inputs or outputs.

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.

Use Proper Overvoltage Protection

Make sure that no overvoltage (such as that caused by a thunderstorm) can reach the product, or else the operator might expose to danger of electrical shock.

Do Not Operate Without Covers

Do not operate the instrument with covers or panels removed.

Use Proper Fuse

Please use the specified fuses.

Avoid Circuit or Wire Exposure

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

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III

Do Not Operate With Suspected Failures

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

Keep Well Ventilated

Inadequate ventilation may cause an increase of temperature or damage to the device. So please keep well ventilated and inspect the intake and fan regularly.

Do Not Operate in Wet Conditions

In order to avoid short circuiting to the interior of the device or electric shock, please do not operate in a humid environment.

Do Not Operate in an Explosive Atmosphere

In order to avoid damages to the device or personal injuries, it is important to operate the device away from an explosive atmosphere.

Keep Product Surfaces Clean and Dry

To avoid the influence of dust and/or moisture in air, please keep the surface of device clean and dry.

Electrostatic Prevention

Operate in an electrostatic discharge protective area environment to avoid damages induced by static discharges. Always ground both the internal and external conductors of the cable to release static before connecting.

Handling Safety

Please handle with care during transportation to avoid damages to buttons, knob, interfaces and other parts on the panels.

User’s Guide for DSA800 Series

RIGOL

WARNING

Warning statements indicate the conditions or practices that could result in

injury or loss of life.

CAUTION

Caution statements indicate the conditions or practices that could result in

damage to this product or other property.

Hazardous

Voltage

Refer to Instructions

Protective Earth

Terminal

Chassis Ground

Test Ground

Safety Terms and Symbols

Terms in this Manual. These terms may appear in this manual:

Terms on the Product. These terms may appear on the product:

DANGER indicates an injury or hazard may immediately happen. WARNING indicates an injury or hazard may be accessible potentially. CAUTION indicates a potential damage to the instrument or other property

might occur.

Symbols on the Product. These symbols may appear on the product:

User’s Guide for DSA800 Series

RIGOL

CAUTION

To avoid damages to the instrument, do not expose them to liquids which

have causticity.

WARNING

To avoid injury resulting from short circuit, make sure the instrument is

completely dry before reconnecting into a power source.

General Care and Cleaning

General Care:

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

Cleaning:

Clean the instrument regularly according to its operating conditions. To clean the exterior surface, perform the following steps:

1. Disconnect the instrument from all power sources.

2. Clean the loose dust on the outside of the instrument with a lint- free cloth

(with mild detergent or water). When cleaning the LCD, take care to avoid scarifying it.

User’s Guide for DSA800 Series

RIGOL

Environmental Considerations

The following symbol indicates that this product complies with the applicable European Union requirements according to Directives 2002/96/EC on waste electrical and electronic equipment (WEEE) and batteries.

Product End-of-Life Handling

The equipment may contain substances that could be harmful to the environment or human health. In order to avoid release of such substances into the environment and harmful to human health, we encourage you to recycle this product in an appropriate system that will ensure that most of the materials are reused or recycled appropriately. Please contact your local authorities for disposal or recycling information.

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VII

DSA800 Series Overview

DSA800 series spectrum analyzers which are small, light and cost-effective, are portable spectrum analyzers designed for starters. Configured with easy-to-operate numeric keyboard, high-resolution color LCD display and various remote communication interfaces, they can be widely used in various fields, such as education, company research and development as well as industrial manufacture.

Main features:

 Frequency Range: 9 kHz to 1.5 GHz  Displayed Average Noise Level (DANL): -135 dBm (Typical)  Phase Noise: -80 dBc/Hz @ 10 kHz offset  Total Amplitude Accuracy: <1.5 dB  Minimum Resolution Bandwidth (RBW): 100 Hz  EMI Filter and Quasi-Peak Detector Kit (Option)  VSWR Measurement Kit(Option)  Standard with Preamplifier and AM/FM Demodulation Function  Various measurement functions (option)  1.5 GHz Tracking Generator (option)  8 inche (800× 480 pixels) high-definition display with clear, vivid, and

easy-to-use graphical interface

 Various interfaces such as LAN, USB Host, USB Device and GPIB (option)  Compact design with only 9.4 lbs

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VIII

Document Overview

Topics in this manual: Chapter 1 Quick Start

This chapter introduces the front/rear panel and user interface as well as announcements during first use of the analyzer.

Chapter 2 Front Panel Operation

This chapter gives detailed function descriptions of the front panel keys with their associated menu keys.

Chapter 3 Remote Control

This chapter shows how to control the analyzer in remote mode.

Chapter 4 Troubleshooting&Message

This chapter lists the troubleshooting information and messages that may appear during the use of the analyzer.

Chapter 5 Specifications

This chapter lists the specifications and general specifications of the analyzer.

Chapter 6 Appendix

This chapter lists the options and accessories that can be ordered along with your analyzer as well as the service and support information.

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Format Conventions in this manual:

1. Buttons:

The keys at the front panel are usually denoted by the format of “Button name (Bold) +textbox”, such as FREQ.

2. Menu keys:

The menu softkeys are usually denoted by the format of “Menu word (Bold) +character shading”, such as Center Freq.

3. Connectors：

The connectors at the front or rear panel are usually denoted by the format of “Connector name (Bold) +square brackets (Bold)”, such as [GEN OUTPUT 50Ω].

4. Operation steps：

“” represents the next step of operation, such as FREQ  Center Freq indicates pressing FREQ at the front panel and then pressing the menu softkey Center Freq.

User manuals provided with this product:

User’s Guide, Quick Guide, Programming Guide, Data sheet etc. For the desired manual, please download it from www.rigol.com.

User’s Guide for DSA800 Series

RIGOL

Contents

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

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

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

Safety Terms and Symbols ....................................................................... IV

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

Environmental Considerations ................................................................... VI

DSA800 Series Overview ...................................................................... VII

Document Overview ............................................................................ VIII

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

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

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

To Prepare for Use ................................................................................. 1-4

To Adjust the Supporting Legs .......................................................... 1-4

To Connect to Power ........................................................................ 1-5

Power-on Inspection ........................................................................ 1-6

Self-calibration ................................................................................ 1-6

Front Panel ............................................................................................ 1-7

Front Panel Function Keys ................................................................ 1-8

Front Panel Key Backlight ............................................................... 1-10

Front Panel Connectors .................................................................. 1-11

To Use the Numeric Keyboard ......................................................... 1-13

Rear Panel ........................................................................................... 1-15

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

Menu Operation ................................................................................... 1-20

Parameter Setting ................................................................................ 1-22

To Input Filename ................................................................................ 1-24

To Use the Built-in Help ........................................................................ 1-27

To Use the Security Lock ....................................................................... 1-29

To Replace the Fuse ............................................................................. 1-30

Chapter 2 Front Panel Operation........................................................ 2-1

Basic Settings ........................................................................................ 2-2

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FREQ ............................................................................................. 2-2

SPAN ............................................................................................. 2-9

AMPT ............................................................................................ 2-12

Sweep and Function Settings ................................................................. 2-23

BW/Det ......................................................................................... 2-23

Sweep/Trig .................................................................................... 2-28

Trace/P/F ...................................................................................... 2-34

TG ................................................................................................ 2-40

Measurement Settings .......................................................................... 2-45

Meas ............................................................................................ 2-45

Meas Setup ................................................................................... 2-49

Demod ......................................................................................... 2-75

Marker Measurements........................................................................... 2-77

Marker .......................................................................................... 2-77

Marker-> ...................................................................................... 2-84

Marker Fctn ................................................................................... 2-86

Peak ............................................................................................. 2-90

Shortcut Key ........................................................................................ 2-94

Auto ............................................................................................. 2-94

UserKey ........................................................................................ 2-96

Preset ........................................................................................... 2-97

Print ........................................................................................... 2-103

System Settings ................................................................................. 2-104

System ....................................................................................... 2-104

Print Setup .................................................................................. 2-115

Storage ....................................................................................... 2-118

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

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

Remote Control Method ......................................................................... 3-3

User-defined Programming .............................................................. 3-3

To Use PC software ......................................................................... 3-6

Chapter 4 Troubleshooting&Message ................................................. 4-1

Troubleshooting .................................................................................... 4-2

Messages ............................................................................................. 4-4

Information Message ....................................................................... 4-6

Error Message ................................................................................ 4-8

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XII

Status Message ............................................................................. 4-21

Chapter 5 Specifications .................................................................... 5-1

Technical Specifications .......................................................................... 5-2

Frequency ....................................................................................... 5-2

Amplitude ....................................................................................... 5-3

Sweep ............................................................................................ 5-6

Trigger ........................................................................................... 5-7

Tracking Generator (DSA815 Option) ................................................. 5-7

Input/Output ................................................................................... 5-7

General Specifications ............................................................................ 5-9

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

Appendix A: Ordering Infomation ............................................................. 6-1

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

Appendix C: Any Comment or Question? .................................................. 6-3

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

User’s Guide for DSA800 Series

Chapter 1 Quick Start RIGOL

1-1

Chapter 1 Quick Start

This chapter introduces the front/rear panel and the user interface, as well as announcements during first use of the analyzer.

Subjects in this chapter:

 General Inspection  Appearance and Dimensions  To Prepare for Use  Front Panel  Rear Panel  User Interface  Menu Operation  Parameter Setting  To Input Filename  To Use the Built-in Help  To Use the Security Lock  To Replace the Fuse

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General Inspection

1. Inspect the shipping container for damage

Keep the damaged shipping container or cushioning material until the contents of the shipment have been checked for completeness and the instrument has passed both electrical and mechanical tests.

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

2. Inspect the instrument

In case of any damage, or defect, or failure, notify your RIGOL sales representative.

3. Check the accessories

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

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Appearance and Dimensions

Figure 1-1 Front View Unit: mm

Figure 1-2 Side View Unit: mm

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To unfold the supporting legs

To fold the supporting legs

To Prepare for Use

To Adjust the Supporting Legs

Users can unfold the supporting legs to use them as stands to tilt the instrument upwards for easier operation and observation. Users can also fold the supporting legs when the instrument is not in use for easier storage or shipment.

Figure 1-3 To Adjust the Supporting Legs

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CAUTION

Make sure that the instrument is properly grounded to avoid electric shock.

To Connect to Power

Please use the power cord provided with the accessories to connect the spectrum analyzer to AC power source as shown in the figure below. For the AC voltage and frequency requirements, refer to “Rear Panel”.

Figure 1-4 Power Cord Connection

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Power-on Inspection

After connecting the instrument to power source correctly, press at the front

panel to start the spectrum analyzer. Following the start-up screen which shows the start-up initialization process information, the sweep curve is displayed.

Self-calibration

After the instrument starts, execute self-calibration. Press System  Calibrate  Cal Now and the instrument will perform

self-calibration using the internal calibration source.

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NO.

Description

NO.

Description

LCD

Tracking generator output*

Menu softkeys/menu control keys

Earphone jack

Function key area

USB Host

Knob

Power switch

Direction keys

Help

Numeric Keyboard

RF input

Preset

1 2 3

11 10 9 8 7

12 4 5

Front Panel

The front panel of DSA800 is as shown in the figure below.

Figure 1-5 Front Panel

Table 1-1 Front Panel Description

Note: This function is an option for DSA815.

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Key

Description

FREQ

Set the center, start and stop frequency; enable the signal tracking function.

SPAN

Set the frequency span of the sweep.

AMPT

Set the reference level, RF attenuator, scale and the unit of Y-axis, etc. Set the reference level offset, maximum mixing level and input impedence. Execute auto scale and auto range as well as turn on the RF preamplifier.

BW/Det

Set the resolution bandwidth (RBW) and video bandwidth (VBW). Set the detector and filter types.

Sweep/Trig

Set the sweep and trigger parameters.

Trace/P/F

Set the parameters related to trace. Configure the Pass/Fail test.

Set the tracking generator*.

Meas

Select and control the measurement function*.

Meas Setup

Set the parameters for the selected measurement function*.

Front Panel Function Keys

Figure 1-6 Function Key Area

Table 1-2 Function keys description

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Demod

Set the demodulation function.

Marker

Read the amplitude, frequency and sweep time of a certain point on the trace.

Marker—>

Set other system parameters on the basis of the current marker value.

Marker Fctn

Special functions of the marker such as noise marker, N dB bandwidth measurement and frequency counter.

Peak

Open the peak search menu and search for peaks immediately.

System

Set the system parameters.

Print Setup

Set the print parameters.

Storage

Provide file storage and recall functions.

Auto

Search for signals automatically within full frequency range.

User Key

User-defined shortcut key.

Preset

Restore the system to factory settings or user-defined state.

Print or save the current screen.

Help

Turn on the built-in help.

Note: This function is an option for DSA815.

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Front Panel Key Backlight

The on/off state and the color of the backlights of some keys at the front panel indicate the working state of the spectrum analyzer. The states are as listed below.

1. Power Switch

 Flash on and off alternatively, in breathing state: indicate the unit is in

stand-by state.

 Constant on: indicate the instrument is in normal operating state.

2. TG

3. Auto

4. Meas

Note: This function is only applicable to DSA815 installed with the corresponding option.

When the TG function is enabled, the backlight of TG turns on and turns off when the function is disabled.

When Auto is pressed, the backlight turns on. The instrument starts sweeping within the full frequency range, searches for the signal with the maximum amplitude and moves it to the center of the screen. Then the backlight turns off.

The backlight of Meas turns on when VSWR or any of the advanced measurements is enabled and stays on until all measurement functions are disabled.

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CAUTION

For fear of damaging your hearing, please turn the volume down to zero and gradually turn the volume up after putting on the earphone.

USB Host

Tracking generator output

RF input

Earphone jack

Front Panel Connectors

Figure 1-7 Front Panel Connectors

1. USB Host

The analyzer can serve as a “host” device to connect external USB devices. This interface is available for USB storage devices and the USB-GPIB interface converter.

 USB Storage Device

Read the trace or state file stored in the USB storage device, store the current instrument state or trace in the USB storage device or store the contents currently displayed on the screen in the USB storage device in “.bmp” format.

 USB-GPIB Interface Converter

Extend a GPIB interface for the analyzer.

2. Earphone Jack

The analyzer provides AM and FM demodulations. Insert the earphone to the jack to aquire the audio output of the demodulated signal. You can turn on or off the earphone output and adjust the volume via Demod  Demod Setup.

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CAUTION

To avoid damage to the tracking generator, the reverse power or voltage can not exceed 1 W or 50 V DC.

CAUTION

To avoid damage to the instrument, for the signal input from the RF input terminal, the DC voltage component and the maximum continuous power of the AC (RF) signal component can not exceed 50 V and 20 dBm respectively.

3. GEN OUTPUT 50 Ω

The output of the tracking generator can be connected to a receiver through a cable with an N male connector. The tracking generator is an option and you can order it when required.

4. RF INPUT 50Ω

The input terminal of the signal under measurement. [RF INPUT 50Ω] can be connected to the device under measurement via a cable with an N male connector.

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To Use the Numeric Keyboard

DSA800 provides a numeric keyboard at the front panel (as shown in the figure below). The numeric keyboard which supports the Chinese characters, English uppercase/lowercase characters, numbers and common symbols (including decimal point, #, space and +/-) are mainly used to edit file or folder name (refer to “To Input Filename”) and set parameters (refer to “Parameter Setting”).

Figure 1-8 Numeric Keyboard

The numeric keyboard consists of the following parts:

 The input mode is fixed at number input during parameter setting. During

parameter setting, press this key to input the symbol (“+” or “-”) of the figure. When the key is pressed for the first time, the parameter symbol is “-” and “+” when the key is pressed again.

 Press to switch among Chinese, English and number input during

file or folder name editing.

2. Number/Letter

 Multiplexing keys for numbers and letters. They are used to directly input

the desired number or letter.

 is used to switch between upper and lower cases in English input.

 is the multiplexing key for 0 and space. Press this key to input 0 in

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number input and space in Chinese or English input.

 Press this key to input a decimal point at the current cursor position in

number input.

 Press this key to input “#” in English input.  This key is invalid in Chinese input.

4. Enter

 When pressed during parameter editing process, the system will

complete the input and insert a default unit for the parameter

automatically.

 While in the process of file name editing, this key is used to input the

character currently selected by the cursor.

5. Esc

 During parameter editing process, press this key to clear the inputs in the

active function area and exit parameter input.

 While in the process of file name editing, press this key tol delete

characters that have been entered.

 Press this key to turn off the display of the active function area when the

main measurement screen is displayed.

 Press this key to exit the current test mode in keyboard test.  Press this key to unlock the screen when it is locked.

6. Back

 During the process of parameter editing, press this key to delete the

character on the left of the cursor.

 While in the process of file name editing, press this key to delete the

character on the left of the cursor.

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1 2 3

Rear Panel

The rear panel of DSA800 is as shown in the figure below.

Figure 1-9 Rear Panel

1. AC Power Connector

Available AC power supply types: 100 V - 240 V, 45 Hz - 440 Hz.

2. Fuse Seat Lid

Open the fuse lid and replace the fuse. DSA800 supports 250V AC, T2A fuse.

3. Security Lock Hole

If needed, you can use a security lock (buy it yourself) to lock the analyzer to a desired location.

4. USB Device Interface

The analyzer can serve as a “slave” device to connect external USB devices. Through this interface, PictBridge printer can be connected to print screen image or PC can be connected to control DSA800 remotely through programming or PC software.

5. LAN Interface

Through this interface, the analyzer can be connected to your local network

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for remote control. An integrated testing system can be built quickly, as the analyzer conforms to LXI-C class instrument standards.

6. TRIGGER IN

In external trigger mode, the connector receives an external trigger signal through BNC cable.

7. 10MHz OUT

DSA800 can use internal or external reference source.

 When internal reference source is used, the [10MHz OUT] connector

can output a 10 MHz clock signal generated by the analyzer. This signal

can be used to synchronize other instruments.

 [10MHz OUT] and [10MHz IN] connectors are usually used to build

synchronization among multiple instruments.

8. 10MHz IN

DSA800 can use internal or external reference source.

 When a 10 MHz external clock signal is received through the [10MHz IN]

connector, this signal is used as the external reference source and “Ext

Ref” is displayed in the status bar of the user interface. When the external

reference is lost, transfinite or not connected, the instrument swithes to

its internal reference source automatically and “Ext Ref” on the screen

disappears.

 [10MHz IN] and [10MHz OUT] connectors are usually used to build

synchronization among multiple instruments.

9. Handle

Users can adjust the handle to the vertical position for easier carrying of the analyzer.

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111111111111111111111111111111111111

151617

891011

21222324252627282930

NO.

Name

Description

RIGOL

Logo of RIGOL

System status ( “UNCAL” and “Identification…” are displayed in different place as others; refer to the figure above)

Auto Tune Auto Range Wait for Trigger Calibrating UNCAL (Measurement Uncalibrated) Identification… (LXI Identification) 3

External reference

Ext Ref

Time

System time

Input impedance

Show “75Ω” if the current input impedance is 75Ω.

Printer status

: displayed alternatively, denote the printer

User Interface

Figure 1-10 User Interface

Table 1-3 User interface labels

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connection is in process.

: denote the connection succeeds, the print

finishes or the printer is idle.

: displayed alternatively, denote the print is

in process.

: denote the print has been paused.

Print process

Show the current print copy and total print copies.

USB storage device status

is displayed when USB storage device is

installed.

Operation status

Display “Local” (in local mode) or “Rmt” (in remote mode).

Menu title

Function of the current menu.

Menu items

Menu items of the current function.

Reference level

Reference level.

Active function area

Current parameter and its value.

Attenuator settings

Attenuator settings.

Display line

Reading the reference and the threshold condition for peak value display.

Trigger level

Set the trigger level in video trigger.

Average times

Average times of trace.

Cursor X

Current X value of the cursor. Note that X indicates different physical quantities in different functions.

Cursor Y

Current Y value of the cursor. Note that Y indicates different physical quantities in different functions.

Invalid data

Current measured data is invalid as a full sweep dosen’t complete after the system parameters have been modified.

Menu page number

Show the total number of pages and current page number.

Sweep position

Current sweep position.

Sweep time

Sweep time.

Span or stop frequency

The frequency range of the current sweep channel can be expressed by a combination of center frequency and span or a combination of start frequency and stop frequency.

Manual setting

The corresponding parameter is in manual setting

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symbol

mode.

VBW

Video bandwidth.

Spectrum line display area

Display the spectrum line. 28

RBW

Resolution bandwidth.

Center or start frequency

The frequency range of the current sweep channel can be expressed by a combination of center frequency and span or a combination of start frequency and stop frequency.

Y scale

Label of Y scale.

Parameter status

Icons on the left side of the screen indicate the status of system parameters.

Detector type

Pos peak, Neg peak, Sample, Normal, RMS Avg, Voltage Avg and Quasi-Peak.

Trigger type

Free, video and external.

Sweep mode

Continuous or Single sweep (with current number of sweeps)

Correction switch

Turn amplitude correction on or off.

Signal tracking

Enable or disable the signal tracking function.

Preamplifier status*

Enable or disable the preamplifier.

Trace 1 type and status

Trace types: Clear Write, Freeze, Max Hold, Min Hold, Video Avg and Power Avg. Trace status: yellow denotes On and gray denotes Off.

Trace 2 type and status

Trace types: Clear Write, Freeze, Max Hold, Min Hold, Video Avg and Power Avg. Trace status: purple denotes On and gray denotes Off.

Trace 3 type and status

Trace types: Clear Write, Freeze, Max Hold, Min Hold, Video Avg and Power Avg. Trace status: light blue denotes On and gray denotes Off.

MATH trace type and status

Trace types: A-B, A+C, A-C. Trace status: green denotes On and gray denotes Off.

UserKey definition

Display the definition of UserKey.

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When selected, use the numeric keys to modify the parameters directly. For example, select Center Freq, input the desired figure and press Enter to change the center frequency.

Press the corresponding menu key to switch between the sub-options. For example, press Signal Track to enable or disable the signal tracking function.

Press the corresponding menu key to enter the lower menu and change the option currently selected. For example, press Units to enter the lower menu. Select dBm and return to the previous menu. The unit of Y-axis changes to dBm.

Press the corresponding menu key to enter the lower menu. For example, press Corrections to enter directly.

Menu Operation

There are 7 types of menus according to their operation modes. Each type of menu and its operation method are introduced below.

1. Parameter Input

2. State Switching

3. Enter Lower Menu (with parameter)

4. Enter Lower Menu (without parameter)

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Press the key to execute the corresponding function. For example, press Peak->CF to execute a peak search and set the center frequency of the analyzer to the frequency of the current peak signal.

Press the corresponding menu key to switch between functions; change the parameter directly using the numeric keys. For example, press CF Step to switch between Auto and Manual; if Manual is selected, you can directly input the desired number to change the CF Step.

Press the corresponding menu key to modify the parameter and return to the menu one level up. For example, press Trig Type  Free Run to select free trigger and the analyzer is in Free Run state at present.

5. Direct Execution

6. Function Switch + Parameter Input

7. State Selection

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RIGOL Chapter 1 Quick Start

1-22

Parameter Setting

Users can enter the desired parameter values using the numeric keys, knob, or direction keys. This section describes the three methods of parameter setting through an example (to set the center frequency to 800 MHz).

1. Use the numeric keyboard

1) Press FREQ  Center Freq;

2) Input 800 using the numeric keys;

3) Select MHz by pressing Enter or select the desired unit from the popup

menu.

2. Use the knob

When the parameter is editable (namely when the parameter is selected), turn the knob clockwise to increase or counterclockwise to decrease the parameter value at specified step.

1) Press FREQ  Center Freq;

2) Rotate the knob until the parameter is set to a certain value (800 MHz).

Figure 1-11 The Knob

Note: in the storage function, the knod can also be used to select the currentpath or file.

3. Use the direction keys

When the parameter is editable (namely when the parameter is selected), you can increase or decrease the parameter value at specific step using the direction keys.

1) Press FREQ  Center Freq;

2) Press up/down direction key until the parameter is set to a certain value

(800 MHz).

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Chapter 1 Quick Start RIGOL

1-23

Figure 1-12 Direction Keys

Note: in the storage function, the direction keys can also be used to select the current path or file.

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RIGOL Chapter 1 Quick Start

1-24

Letter Selecting Area Uppercase/Lowercase

Letters Entered English Input Mode

Numbers Entered Number Input Mode

To Input Filename

DSA800 supports filenames consisting of Chinese characters, English letters, number and #.

1. Enter the filename input interface

Press Storage and select the desired file type and storage location. Then

press Save to enter the filename input interface. You can press to

switch among English, Chinese and number input modes.

(a) English Input Mode

(b) Number Input Mode

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1-25

Tip

If USB storage device is currently connected, the instrument will also enter the filename input interface when is pressed.

Pinyin Selecting Area Chinese Character Selecting Arear

Chinese Characters Entered Chinese Input Mode

Figure 1-13 Filename Input Interface

2. Input English Filename

1) Press to switch to English input mode. You can also press to

switch between upper and lower cases. At this point, the corresponding label is displayed at the lower right corner of the filename input interface.

2) Press the key of the desired letter. At this point, the letters available are

displayed in the letter selecting area. Press this key repeatedly until the desired letter is selected (the background color of the letter becomes brown). Then press Enter to input the desired letter.

3) Use the above method to input the other letters.

3. Input Chinese Filename

1) Press to switch to Chinese input mode (T9 input method). At this

point, the corresponding label is displayed at the lower right corner of the filename input interface.

2) Press the key of the first letter of the pinyin of the Chinese character. At

this point, the pinyins available are displayed in the pinyin selecting area and the corresponding Chinese characters of the pinyin currently selected are displayed in the Chinese character selecting area. If the desired pinyin is displayed, refer to 3). Otherwise, please continue to

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Tip

If you need to use numbers as the filename (or part of the filename), press to switch to number input mode and use the numeric keys to input the desired number.

input the other letters in the pinyin and then refer to 3).

3) Rotate the knob until the background color of the desired pinyin becomes

brown. Then, press Enter to select the pinyin. At this point, the

corresponding Chinese characters with numbers are displayed in the

Chinese character selecting area. Use the numeric keys to select the

desired Chinese character. You can also use the the direction keys to open

the previous or next page in the Chinese character selecting area.

4) Use the same method to input the other Chinese characters.

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1-27

To Use the Built-in Help

The built-in help system provides information about every function key at the front panel and every menu softkey.

1. How to acquire built-in help

Press Help and a prompt about how to obtain help information will be shown at the center of the screen. Then, press the key that you want to get help of and the relevant help information will be shown at the center of the screen.

2. Page up and down

If there is more than one page of information, you can read the help information on the previous or next page using the direction keys or the knob.

3. Close the current help information

Press any key at the front panel (except the direction keys and the knob) to close the help information currently displayed at the center of the screen.

4. Acquire the menu help

Press Help and the help information display window is displayed at the center of the screen. Then, press the menu key and the help information of the corresponding menu item is displayed.

5. Acquire the help information of any function key

Press Help and the help information display window is displayed at the center of the screen. Then, press any function key and the corresponding function help information is displayed.

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RIGOL Chapter 1 Quick Start

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Figure 1-14 The Built-in Help Interface

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Chapter 1 Quick Start RIGOL

1-29

Key

Security Lock Hole

Security Lock

To Use the Security Lock

If necessary, use a security lock to lock the analyzer in a desired location. As shown in the figure below, align the lock with the lock hole and plug it into the lock hole vertically, turn the key clockwise to lock the instrument and then pull the key out.

Figure 1-15 To Use the Security Lock

Note: Please do not insert other articles into the security lock hole to avoid damaging the instrument.

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1-30

WARNING

Please ensure that the instrument has been turned off and the power source has been cut off before replacing the fuse in order to avoid electric

shock.

Fuse Holder

Fuse

To Replace the Fuse

Please replace the burned fuse with specified fuse according to the following steps when needed:

1． Open the fuse lid above the power connector. 2． Dismount the fuse holder. 3． Replace with a new fuse. 4． Remount the fuse holder and close the lid.

Figure 1-16 To Change the Fuse

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Chapter 2 Front Panel Operation RIGOL

2-1

Chapter 2 Front Panel Operation

This chapter describes in detail the function keys at the front panel and the associated functions.

Subjects in this chapter:

 Basic Settings  Sweep and Function Settings  Measurement Settings  Marker Measurements  Shortcut Key  System Settings

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2-2

start

stop

center

span

2)(

startstopcenter

fff 

startstopspan

fff 

Basic Settings

FREQ

Set the frequency parameters of the analyzer. The analyzer sweeps within a specified frequency range, and the sweep is restarted every time you change the frequency parameters.

The frequency range of a channel can be expressed by either of two groups of

parameters: Start Frequency and Stop Frequency（

Frequency and Span（

）. If any of the parameters is changed, the

） ; or Center

others would be adjusted automatically in order to ensure the coupling relationship among them:

(2-1)

(2-2)

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2-3

Center Freq

Parameter

Explanation

Default

750 MHz

Range*

0 Hz to 1.5 GHz

Unit

GHz, MHz, kHz, Hz

Knob Step

Span > 0, step = Span/200 Span = 0, step = RBW/100 Min = 1 Hz

Direction Key Step

CF step

Set the center frequency of the current channel. Press this key to switch to center frequency/span input mode and the center frequency and span values are displayed at the lower left and right sides of the grid respectively.

Key Points:

 The start and stop frequencies vary with the center frequency when the span

is constant.

 Changing the center frequency horizontally shifts the current channel and the

adjustment is limited by the specified frequency range.

 In Zero Span mode, the start frequency, stop frequency and center frequency

are always the same.

 You can modify this parameter using the numeric keys, knob or direction keys.

Refer to “Parameter Setting” for more details.

Table 2-1 Center Frequency

Note: The range is from 50 Hz to (1.5 GHz-50 Hz) in non-zero span.

Start Freq

Set the start frequency of the current channel. Press this key to switch to start/stop frequency input mode and the start and stop frequencies are displayed at the lower left and right sides of the grid respectively.

Key Points:

 The span and center frequency vary with the start frequency. The change of

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2-4

Parameter

Explanation

Default

0 GHz

Range*

0 Hz to 1.5 GHz

Unit

GHz, MHz, kHz, Hz

Knob Step

Span > 0, step = Span/200 Span = 0, step = RBW/100 Min = 1 Hz

Direction Key Step

CF step

span would affect other system parameters. For more details, please refer to “Span”.

 In Zero Span mode, the start frequency, stop frequency and center frequency

are always the same. If one is changed, the others are updated to match.

 You can modify this parameter using the numeric keys, knob or direction keys.

Refer to “Parameter Setting” for more details.

Table 2-2 Start Frequency

Note: The range is from 0 Hz to (1.5 GHz-100 Hz) in non-zero span.

Stop Freq

Set the stop frequency of the current channel. Press this key to switch to start/stop frequency input mode and the start and stop frequencies are displayed at the lower left and right sides of the grid respectively.

Key Points:

 The span and center frequency vary with the stop frequency. The change of

span would affect other system parameters. For more details, please refer to “Span”.

 You can modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

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Table 2-3 Stop frequency

Parameter

Explanation

Default

1.5 GHz

Range*

0 Hz to 1.5 GHz

Unit

GHz, MHz, kHz, Hz

Knob Step

Span > 0, step = Span/200 Span = 0, step = VBW/100 Min = 1 Hz

Direction Key Step

CF step

Parameter

Explanation

Default

150 MHz

Range

1 Hz to 1.5 GHz

Unit

GHz, MHz, kHz, Hz

Knob Step

Span > 0, step = Span/200 Span = 0 , step = 100 Hz Min = 1 Hz

Direction Key Step

in 1, 2, 5 sequence

Note: The range is from 100 Hz to 1.5 GHz in non-zero span.

CF Step

Set the step of center frequency. Changing the center frequency in a fixed step continuously switches the channel to be measured.

Key Points:

 The CF step can be set in “Manual” or “Auto” mode. In Auto mode, the CF step

is 1/10 of the span in Non-zero span mode or equals the RBW while in Zero span mode; in Manual mode, you can set the step using the numeric keys.

 After you set an appropriate CF step and select Center Freq, use up and

down direction keys to switch between measurement channels in a specified step in order to sweep the adjacent channel manually.

 You can modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

Table 2-4 CF step

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2-6

Start

Execute a

sweep

Search peak

and mark

Exist active

marker?

Set marker

frequency to

center freq

Execute the

next sweep

Search and mark the

frequency point (variation

< 3dB) near the marker

Signal Track

Turn on or off signal track. This function is used to track and measure signal with unstable frequency and less than 3 dB transient variation in amplitude by placing Marker1 (see “Marker Measurements”) onto the signal under measurement to track and measure the variation of the signal continuously.

The signal track process is as shown in the figure below:

Figure 2-1 Process of Signal Track

Key Points:

 When Signal Track is On, the ST (Signal Track) icon is shown in the status

bar at the left of the screen.

 If an active marker currently exists, when Signal Track is enabled, the

instrument will search and mark the point (with no more than 3 dB variation in amplitude) near the marker as well as set the frequency of this point as the

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center frequency to hold the signal at the center of the screen.

Peak

Center Freq

 If no marker is currently active, when Signal Track is enabled, the instrument

will activate Marker 1, execute a peak search automatically and set the frequency of the current peak as the center frequency to hold the signal at the center of the screen.

 In continuous sweep, the system tracks the signal continuously; in single

sweep, only one track is done; in Zero Span, Signal Track is invalid.

Peak -> CF

Execute a peak search and use the frequency of current peak as the center frequency (CF) of the analyzer. The function is invalid in Zero Span mode.

Figure 2-2 Before Peak->CF

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2-8

Peak

Center Freq

Figure 2-3 After Peak->CF

CF -> Step

Set the current center frequency as the CF step. At this point,

the CF step will switch to "Manual" mode automatically. This function is usually used with channel switching. Take harmonic waveform measurement for example: locate a signal at the center frequency of a channel, execute CF-> Step and then continuously press the down direction key to measure each order of harmonic in sequence.

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2-9

SPAN

Parameter

Explanation

Default

1.5 GHz

Range*

0 Hz to 1.5 GHz

Unit

GHz, MHz, kHz, Hz

Knob Step

Span/200, Min = 1 Hz

Direction Key Step

in 1, 2, 5 sequence

Set the span of the analyzer. The change of this parameter will affect the frequency parameters and restart the sweep.

Span

Set the frequency range of the current channel. Press this key to switch to center frequency/span input mode and the center frequency and span are displayed at the lower left and right sides of the grid respectively.

Key Points:

 The start and stop frequencies vary with the span automatically.  In manual span mode, the span can be set down to 100 Hz (the only way into

the zero-span mode is pressing the Zero Span menu option) and up to the full span described in “Specifications”. When the span is set to the maximum, the analyzer enters full span mode.

 Modifying the span in non-zero span mode may cause an automatic change in

both CF step and RBW if they are in Auto mode, and the change of RBW may influence VBW (in Auto VBW mode).

 Variation in the span, RBW or VBW would cause a change in the sweep time.  In non-zero span mode, neither “Video” trigger nor “1/Δtime” readout

function is valid.

 You can modify this parameter using the numeric keys, knob, or direction keys.

For more details, please refer to “Parameter Setting”.

Table 2-5 Span

Note: 0 Hz is available only in zero span.

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Full Span

Set the span of the analyzer to the maximum.

Zero Span

Set the span of the analyzer to 0 Hz. Both the start and stop frequencies will equal the center frequency and the horizontal axis will denote time. The analyzer measures the time domain characteristics of the amplitude of the corresponding frequency point on the input signal.

Key Points:

As opposed to the Non-zero span, the screen shows the time domain characteristics of the fixed frequency component in zero span mode.The following functions are invalid in Zero span mode:

 FREQ: Peak->CF and Signal Track;  SPAN: Zoom In and Zoom Out;  Marker->: Mkr->CF, Mkr->Step, Mkr->Start, Mkr->Stop, MkrΔ->CF and

MkrΔ->Span;

 Marker  Readout: Frequency, Period and 1/ΔTime (valid in Delta marker

type);

 TG: Power Sweep.

Zoom In

Set the span to half of its current value. At this point, the signal on the screen is zommed in on to observe signal details.

Zoom Out

Set the span to twice the current value. At this point, the signal on the screen is zoomed out on to gain more information about the signal.

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Last Span

Set the span to the previous span setting.

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2-12

AMPT

Set the amplitude parameters of the analyzer. Through modifying these parameters, signals under measurement can be displayed in a proper mode for easier obsercation and minimum error.

Auto Scale

This function enables the readout resolution of the Y-axis to be the maximum possible while at the same time ensures the completeness of the signal. When enabled, the system sets the reference level automatically in order to place the peak of the signal within the topmost grip for easier observation of the trace.

Figure 2-4 Before Auto Scale

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2-13

mixPARFRef

LaaL 

Ref

mix

Figure 2-5 After Auto Scale

Ref Level

Set the maximum power or voltage can be currently displayed in the window and the value is displayed at the upper left corner of the screen grid.

Key Points:

 The maximum reference level available is affected by the maximum mixing

level, input attenuation and preamplifier. When you adjust it, the input attenuation is adjusted under a constant maximum mixing level in order to fulfill the following inequality:

(2-3)

and

the preamplifier and the maximum mixing level respectively.

 You can modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

denote the reference level, the input attenuation,

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2-14

Parameter

Explanation

Default

0 dBm

Range

-100 dBm to 20 dBm

Unit

dBm, -dBm, mV, uV

Knob Step

in Log scale mode, step = Scale/10 in Lin scale mode, step = 0.1 dBm

Direction Key Step

in Log scale mode, step = Scale in Lin scale mode, step = 1 dBm

Parameter

Explanation

Default

10 dB

Range

0 dB to 30 dB

Unit

Knob Step

1 dB

Direction Key Step

5 dB

Table 2-6 Reference level

Input Atten

Set the front attenuator of the RF input in order to ensure big signals (or small signals) to pass from the mixer with low distortion (or low noise).

Key Points:

 When the preamplifier is On, the input attenuation could be set up to 30 dB.

You can adjust the reference level to ensure that the specified parameter meets the inequality (2-3).

 You can modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

Table 2-7 Input attenuation

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2-15

Scale/Div

Parameter

Explanation

Default

10 dB

Range

0.1 dB to 20 dB

Unit

Knob Step

Scale ≥ 1, step = 1 dB Scale < 1, step = 0.1 dB

Direction Key Step

in 1, 2, 5 sequence

Set the logarithmic units per vertical grid division on the display. This function is only available when the scale type is set to “Log”.

Key Points:

 By changing the scale, the amplitude range available is adjusted.  The range of the amplitude that can be displayed:

Minimum: reference level – 10 × the current scale value Maximum: the reference level.

 You can modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

Table 2-8 Scale

Scale Type

Set the scale type of Y-axis to Lin or Log, the default is Log.

Key Points:

 In Log scale type: the Y-axis denotes the logarithmic coordinate, the value

shown at the top of the grid is the reference level and each grid represents the scale value. The unit of Y-axis will automatically switch to the default “dBm” in Log scale type when the scale type is changed from Lin to Log.

 In Lin scale type: the Y-axis denotes the linear coordinate, the values shown

at the top of the grid and the bottom of the grid are the reference level and 0 V respectively. Each grid represents 10% of the reference level and the Scale/Div is invalid. The unit of Y-axis will automatically switch to the default

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2-16



 





 





Volts

001.0

log10md



 





 







Volts



log20d



 





 







Volts

log20md

Volts

Watts2

“Volts” in Lin scale type when the scale type is changed from Log to Lin.

 The scale type does not affect the unit of Y-axis.

Units

Set the unit of the Y-axis to dBm, dBmV, dBuV, Volts or Watts. Wherein, dBm, dBmV, and dBuV are for Log scale; Volts and Watts are for Linear scale. The default is dBm.

Key Points:

The conversion relationships between units:

(2-4)

(2-5)

(2-6)

(2-7)

Wherein, R denotes the reference resistance.

Ref Offset

Assign an offset to the reference level to compensate for gains or losses generated between the device under measurement and the analyzer.

Key Points:

 The change of this value changes both the reference level readout and the

amplitude readout of the marker, but does not impact the position of the curve

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on the screen.

Parameter

Explanation

Default

0 dB

Range

-300 dB to 300 dB

Unit

Knob Step

N/A

Direction Key Step

N/A

 You can modify this parameter using the numeric keys. For more details,

please refer to “Parameter Setting”.

Table 2-9 Reference level offset

Auto Range

Adjust the amplitude parameters within the current span range automatically in order to display the whole signal optimally on the screen.

Figure 2-6 Before Auto Range

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Figure 2-7 After Auto Range

Key Points:

 Unlike Auto Scale, this function can solve the problem of signal overrange due

to parameter settings and adjust the maximum mixing level according to the signal under measurement.

 Unlike Auto, this function adjusts the signal within the current channel and

does not modify the channel frequency setting. While, Auto will search for signal within the full frequency range and locate the signal at the center frequency.

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Start

Peak Search

Adjust Ref Level

Peak > Ref Level?

Decrease maximum

mixing level

Stop

Increase maximum

mixing level

Large signal?

Auto Scale

RF Preamp

Figure 2-8 Process of Auto Range

Set the status of the preamplifier located at the front of the RF signal path. Turning on the preamplifier reduces the displayed average noise level in order to distinguish small signals from the noise when the signal under measurement is small.

Key Points:

The corresponding icon will be displayed in the status bar at the left side of

User’s Guide for DSA800 Series

the screen when the preamplifier is On.

RIGOL Chapter 2 Front Panel Operation

2-20

Correction

Correct the amplitude in order to compensate for the gain or loss from external devices such as Antenna and Cable. When using this function, you can view the correction data table and save or load the current correction data. When Correction is On, both the trace and related measurement results will be corrected,

and the corresponding icon is shown in the status bar at the left of the screen.

1. Select

Select a correction factor from Antenna, Cable, Other and User for the current correction and the default is Off. After chooosing correction factors, press Correction to enable the chosen correction factors. Multiple correction factors can be enabled at the same time.

2. Correction

Enable or disable amplitude correction and the default is Off. When Correction is enabled, the data of the correction factor currently selected is used for amplitude correction. If multiple factors are enabled, all related data will be used for amplitude correction.

3. Edit

Edit the frequency of the correction factor and the correction data of the corresponding amplitude. You can modify this parameter using the numeric keys, knob or direction keys. For details, refer to the table on the next page.

Note: the edited correction data can be stored in internal or external memory and can be recalled when needed. When correction data editing is finished, press Storage to save the correction data using the method introduced in “Storage”. The edit point can only increase continuously, namely the point can only increase to 2 after “point 1” is edited.

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Table 2-10 Edit menus of Amplitude correction

Explanation

Point

Create or edit the data point of a correction factor. Range: 1 to 200

Frequency

Set the frequency of the specified point in the correction facor.

Amplitude

Set the amplitude correction of the specified point in the correction facotr. Range: -120 dB to 100 dB

Del Point

Delete the specified point data in the correction factor: frequency and amplitude correction.

4. Freq Interp

Set the interpolation type of the points between two points in the correction table during amplitude correction.

 In Lin mode, the frequency and amplitude separately use a Lin and Log

unit to perform interpolation.

 In Log mode, both of the parameters use a Log unit.

5. Delete

Clear the frequency and amplitude correction data of the selected correction factor.

6. Corr Table

Turn on the correction table to view the correction data edited. At this moment, the screen is divided into two parts with the upper showing the measurement curve and the lower showing the points edited, frequency, and amplitude.

7. Corr View

 All: view the data of all the correction factors.  Sel: view the data of the selected correction factor.

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2-22

Parameter

Explanation

Default

-10 dBm

Range

-30 dBm to 0 dBm

Unit

dBm, -dBm, mV, uV

Knob Step

1 dBm

Direction Key Step

10 dBm

MaxMixL

Set the max input level of the mixer according to the magnitude of the signal.

Key Points:

 For a larger input signal, select a smaller maximum mixing level to increase

the input attenuation and reduce the distortion of the signal; for a smaller input signal, select a larger maximum mixing level to reduce the input attenuation and noise.

 Parameters in inequality (2-3) are always modified on the basis of the

maximum mixing level.

 You can modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

Table 2-11 Maximum mixing level

Input Impedance

Set the input impedance for voltage-to-power conversions (refer to equation (2-4)). The default is 50 Ω. To measure a 75 Ω device, you should use a 75 Ω to 50 Ω adapter supplied by RIGOL to connect the analyzer with the system under test and then set the input impedance to 75 Ω.

Note: “75 Ω” will be shown in the status bar on the screen in this situation.

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Sweep and Function Settings

Parameter

Explanation

Default

1 MHz

Range

100 Hz to 1 MHz

Unit

GHz, MHz, kHz, Hz

Knob Step

in 1, 3, 10 sequence

Direction Key Step

in 1, 3, 10 sequence

BW/Det

Set the RBW (Resolution Bandwidth), VBW (Video Bandwidth) and detector type parameters of the analyzer.

RBW

Set the desired resolution bandwidth in order to distinguish between signals which are close in frequency.

Key Points:

 Reducing RBW will increase the frequency resolution, but will increase the

sweep time (Sweep Time is affected by a combination of RBW and VBW when it is in Auto mode).

 RBW decreases with the span (non-zero span) in Auto RBW mode.  You can modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

Note: if detector type is “Quasi-Peak” or filter type is “EMI”, RBW can be 200 Hz, 9

kHz or 120 kHz only.

Table 2-12 RBW (Filter Type is Gauss)

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2-24

Parameter

Explanation

Default

1 MHz

Range

1 Hz to 3 MHz

Unit

GHz, MHz, kHz, Hz

Knob Step

in 1, 3, 10 sequence

Direction Key Step

in 1, 3, 10 sequence

VBW

Set the desired video bandwidth in order to filter out the noise outside the video band.

Key Points:

 Reducing the VBW will smooth the spectrum line to differentiate small signals

from noise, but will increase the sweep time (Sweep Time is affected by a combination of RBW and VBW when it is in Auto mode).

 VBW varies with RBW when it is set to Auto. While in Manual mode, VBW is

not affected by RBW.

 You can modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

Table 2-13 VBW

V/R Ratio

Set the ratio of VBW to RBW.

Key Points:

 This value is different while measuring different kinds of signals:

Sine signal: use 1 to 3 (for faster sweeps) Pulse signal: use 10 (to reduce the influence on the amplitude of transient signals) Noise signal: generally use 0.1 (to obtain the average of noises)

 You can modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

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Table 2-14 V/R Ratio

Parameter

Explanation

Default

Range

0.0000010 to 30000

Unit

N/A

Knob Step

in 1, 3, 10 sequence

Direction Key Step

in 1, 3, 10 sequence

Detector Type

The analyzer displays the sweeped signal on the screen in the form of trace. For each trace point, the analyzer always captures all the data within a specific time interval and processes (Peak, Average,etc.) the captuered data using the detector selected currently, then display the processed data (one point) on the screen .

Key Points:

 Select an appropriate detector type according to the actual application in

order to ensure the accuracy of the measurement.

 The available types are Pos Peak, Neg Peak, Sample, Normal, RMS Avg,

Voltage Avg and Quasi-Peak. The default is Pos peak.

 The corresponding icon (as shown in the figure below) of the detector type

selected is displayed in the status bar at the left side of the screen.

1. Pos Peak

For each trace point, Positive Peak detector displays the maximum value of data sampled within the corresponding time interval.

2. Neg Peak

For each trace point, Negative Peak detector displays the minimum value of data sampled within the corresponding time interval.

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





iRMS

RMS









iAV

3. Sample

For each trace point, Sample detector displays the transient level corresponding to the central time point of the corresponding time interval. This detector type is applicable to noise or noise-like signal.

4. Normal

Normal detector (also called rosenfell detector) displays the maximum value and the minimum value of the sample data segment in turn, namely for an odd-numbered data point, the maximum value is displayed; and for an even-numbered data point, the minimum value is displayed. In this way, the amplitude variation range of the signal is clearly shown.

5. RMS Avg

For each data point, perform mean square root operation (see the equation below) of the sample data within the corresponding time interval and display the result. In this type, noise can be rejected and weak signals can be clearly observed.

(2-8)

Wherein,

sample values for each point displayed;

in V. The reference resistance

power calculation:

is the mean square root of voltage in V; N is the number of

is the envelop of the sample value

(the reference impedance)

can be used for

6. Voltage Avg

For each data point, average (see the equation below) all the sample data within the corresponding time interval and display the result.

(2-9)

Wherein,

is the average of voltage in V;

is the number of sample

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values for each point displayed;

is the envelop of the sample value in V.

7. Quasi-Peak (an option for DSA815)

It is a weighted form of peak detector. For each data point, the detector detects the peaks within the corresponding time interval. The peaks detected are weighted using circuit with specified charge and discharge structures as well as the display time constant specified in the CISPR Publication 16 standards and the result is displayed. Quasi-Peak detector is applicable to EMI testing.

Note: compared to the discharge time, the charge time of Quasi-Peak detector is much shorter and can reflect the amplitude as well as time distribution of the signal.

Filter Type

Set RBW filter type.

Key Points:

 DSA800 supports two kinds of RBW filters: “Gause” (-3 dB bandwidth) and

“EMI” (-6 dB bandwidth).

 When “EMI” is selected, resolution bandwidth can be 200 Hz, 9 kHz or 120

kHz only.

 The default is “Gause”; the instrument will switch to “EMI” filter automatically

when “Quasi-Peak” detector is selected.

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Parameter

Explanation

Default

50 ms

Range*

20 us to 1500 s

Unit

ks, s, ms, us, ns, ps

Knob Step

Sweep time/100, Min = 1 ms

Direction Key Step

in 1, 1.5, 2, 3, 5, 7.5 sequence

Sweep/Trig

Set parameters about the Sweep and Trigger functions, including Time, Auto SWT, Mode, Numbers, Trigger type, etc.

Sweep Time

Set the time needed for the spectrum analyzer to finish a sweep within the span

range. The sweep time can be set in “Auto” or “Manual” mode and the default is “Auto”.

Key Points:

 In non-zero span, the analyzer selects the shortest sweep time on the basis of

the current RBW and VBW settings if Auto is selected.

 Decreasing the sweep time would speed the measurement. However, an error

may be caused if the specified sweep time is less than the minimum sweep time in Auto coupling, and “UNCAL” is shown in the status bar on the screen.

 You can modify this parameter using the numeric keys, knob or direction keys.

For more details, please refer to “Parameter Setting”.

Table 2-15 Sweep time

Note: The minimum in non-zero span mode is 10 ms.

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Auto SWT

Set the auto setting method of the sweep time to “Normal” or “Accy”. The sweep will be faster if “Normal” is selected; while in “Accy” type, higher measurement precision can be obtained.

Mode

Set the sweep mode to “Single” or “Cont”, the default is “Cont”. The corresponding icon of the sweep mode will be displayed in the status bar at the left side of the screen.

Single Continuous

1. Single

Set the sweep mode to “Single”. The number 10 on the parameter icon denotes the current sweep number.

2. Cont

Set the sweep mode to “Cont”. The character Cont on the parameter icon denotes the analyzer is sweeping continuously.

Key Points:

 If the instrument is in single sweep mode and no measurement function is

enabled, press this key and the system will enter the continuous mode and sweep continuously if all the trigger conditions are satisfied.

 If the instrument is in single sweep mode and a measurement function is on,

press this key and the system will enter the continuous sweep mode and measure continuously if all the trigger conditions are satisfied.

 In continuous mode, the system will send a trigger initialization signal

automatically and enter the trigger condition judgment directly after each sweep.

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Enter continuous sweep mode and

wait for trigger condition

Sweep again and wait for trigger

condition

Select “Cont”

Single sweep status？

Y N

Figure 2-9 Process of Continuous Sweep

Single

In single sweep mode, this menu is used to execute trigger initialization. After that, the analyzer will execute specified number of sweeps (or measurements) if all the trigger conditions are satisfied.

Key Points:

 If the instrument is in continuous sweep mode and no measurement function

is enabled, press this key and the system will enter the single sweep mode and execute specified number of sweeps if all the trigger conditions are satisfied.

 If the instrument is in continuous sweep mode and a measurement function is

on, press this key and the system will enter the single measure mode and execute specified number of measurements if all the trigger conditions are satisfied.

 If the system is already in single sweep mode, press this key and the system

will execute specified number of sweeps (or measurements) if all the trigger conditions are satisfied.

 In single sweep mode, trigger initialization (press Sweep/Trig  Single or

send the “:INIT” command through the remote interface) should be executed before trigger condition judgment.

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Press “Single”

Measuring status?

Single sweep status? Single sweep status?

Enter single sweep mode

and wait for trigger

condition

Enter single sweep/

measure mode and wait

for trigger condition

Sweep again and wait

for trigger condition

Wait for trigger condition

and make single

measurement again

Figure 2-10 Process of Single Sweep

Parameter

Explanation

Default

Range

1 to 9999

Unit

N/A

Knob Step

Direction Key Step

Numbers

Set the number of sweeps for a single sweep. In single mode, the system executes specified number of sweeps and the number shown on the icon in the status bar at the left of the screen varies with the process of the sweep.

Table 2-16 Numbers

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Trig Type

The trigger type can be Free Run, Video or External. The corresponding icon of the trigger type will be displayed in the status bar at the left of the screen.

1. Free Run

All trigger conditions can be satisfied at any time and the analyzer generates trigger signals continuously.

2. Video

A trigger signal will be generated when the system detects a video signal of which the voltage exceeds the specified video trigger level. This function is invalid in non-zero span mode, RMS Avg detection or Voltage Avg detection in zero span mode.

3. External

In this mode, an external signal (TTL signal) is input from the [TRIGGER IN] connector at the rear panel and trigger signals are generated when this signal fulfills the specified trigger edge condition.

Trig Setup

1. Trigger Level

Set the trigger level in video trigger. At this point, the trigger level line (TL) and value are displayed on the screen. You can use the numeric keys, knob or direction keys to modify this parameter. Please refer to “Parameter

Setting” for more details.

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Table 2-17 Trigger level

Parameter

Explanation

Default

0 dBm

Range

-300 dBm to 50 dBm

Unit*

dBm

Knob Step

1 dBm

Direction Key Step

10 dBm

Note: it is related to the specified unit of Y-axis.

2. Edge

Set the trigger edge in external trigger to the rising (Pos) or falling (Neg) edge of the pulse.

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Trace/P/F

The sweep signal is displayed as a trace on the screen. In addition, DSA800 provides the Pass/Fail (P/F) test function. Trace/P/F is used to set parameters relateted to the trace and P/F test.

Select Trace

DSA800 allows for up to four traces to be displayed at the same time, and each trace has its own color (Trace 1 - Yellow, Trace 2 - purple, Trace 3 - light blue and Trace 4 - green). All traces can be set freely except Trace 4 (a math operation trace that can only be obtained using the other three traces).

Select Trace 1, Trace 2 or Trace 3 to set the corresponding parameters. The default trace and type is Trace 1 and Clear Write.

Note: the trace currently displayed on the screen can be stored in internal or external memory and can be recalled when needed. Press Storage to save the trace according to the method introduced in “Storage”.

Trace Type

Set the type of the current trace or disable it. The system calculates the sample data using a specific operation method according to the trace type selected and displays the result. Trace types contain Clear Write, Max Hold, Min Hold, Video Avg, Power Avg and Freeze. The corresponding icon of the trace type will be displayed in the status bar at the left of the screen. Take Trace 1 (yellow) as an example and the icons are as shown in the figure below.

1. Clear Write

The trace continuously displays the points during the sweep of the analyzer.

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2. Max Hold

Maintain the maximum for each point of the trace, and update the trace point if a new maximum is generated in successive sweeps.

3. Min Hold

Maintain the minimum for each point of the trace, and update the trace point if a new minimum is generated in successive sweeps.

4. Video Avg

Display the logarithmic average for each point of the trace. Traces in this type are smoother.

5. Power Avg

Display the average of each point of the trace. Traces in this type are smoother.

6. Freeze

Stop updating the trace data to observe the trace and read the measurement data. This type is generally used by traces loaded from storage devices or remote interface as default.

7. Blank

Disable the trace display and all measurements of this trace.

Average Times

Set the number of averages of the selected trace.

Key Points:

 More averages can reduce the noise and the influence of other random signals,

thus highlighting the stable signal characteristics. The larger the number of averages is, the smoother the trace will be.

 You can use the numeric keys to modify this parameter, please refer to

“Parameter Setting” for more details.

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Parameter

Explanation

Default

100

Range

1 to 1000

Unit

N/A

Knob Step

N/A

Direction Key Step

N/A

Parameter

Explanation

Default

0 dB

Range

-300 dB to 300 dB

Unit

Table 2-18 Average times

Trace Math

1. Function

Set the computational method of the math trace.

 A-B: subtract Trace B from A  A+Constant: add a constant to Trace A  A-Constant: subtract a constant from Trace A

2. A

Select “T1”, “T2” or “T3”. Assign a value to A from Trace1, Trace 2 or Trace 3, the default is Trace 1 (T1).

3. B

Select “T1”, “T2” or “T3”. Assign a value to B from Trace1, Trace 2 or Trace 3, the default is Trace 2 (T2).

4. Constant

Set the value of the constant. You can use the numeric keys to modify this parameter, please refer to “Parameter Setting” for more details.

Table 2-19 Constant in the math operation

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5. Operate

Enable or disable the display of the math trace and the default is Off.

Clear All

Clear all the traces displayed on the screen. This operation will stop the current advanced measurement as there is not valid data source.

Pass/Fail

DSA800 supports the Pass/Fail test function. In this function, the measured curve is compared with the pre-edited curve. If the related rules are met, the result is “Pass”, or else is “Fail”. The measurement interface is as shown in the figure below.

Figure 2-11 Interface of Pass/Fail Measurement

Result:

The results of Pass/Fail test contain the pass number and the pass ratio.

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Function

Explanation

Limit

Quickly select the limit line to be edited.

Point

Set the number of the point to be edited. The range is from 1 to 200.

X-axis

Edit the properties of the limit lines.

Amplitude

Enter the amplitude of the point you are editing. The range is from -400 dBm to 320 dBm.

Connected

Connect this point with the previous one or not.

Del Point

Delete the point you are editing.

1. Switch

Turn on or off the Pass/Fail test function and the default is “Off”. When the function is enabled, the system changes to split-screen display. At this point, T2 and T3 are used for marking the Upper and Lower limits separately.

2. Settings

 Limit: select the desired limit line (upper or lower) for editing, and then

press Edit to set the limit conditions.

 Test: enable or disable the test function. Each limit line has its own

switch, you can test both together, either one or neither.

Note: Trace/P/F  Pass/Fail  Switch is only used to enable or

disable the setting menu of Pass/Fail test, not the test itself.

 Edit: Edit the properties of the limit lines.

Note: the edited limit line data can be stored in internal or external

memory and can be recalled when needed. After the editing is finished,

press Storage to store the data according to the method introduced in

“Storage”.

Table 2-20 Pass/Fail menu

 X Axis: set the X-axis unit to frequency or time unit. Note that all the

points of the current limit line will be deleted when the X-axis unit

changes.

 Freq Interp: set the Freq Interp to Log or Lin. In Log mode, both the

frequency and amplitude use Log unit to do interpolation operation; in Lin

mode, the frequency uses a Lin unit and the amplitude uses a Log unit for

interpolation operation.

 Del Limit: delete the limit line you are editing.

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 Fail Stop: select whether to perform the next sweep if the test fails.  Beeper: turn on or off the beeper. When the beeper is on, it beeps when

the test fails.

3. Restart

Re-execute the active or suspended test.

4. Pause

Suspend the test after the current test is finished. At this point, the

measurement data stops updating, but the sweep continues. is displayed in the test result display window.

5. Resume

Resume the suspended test and the test data begins updating again. is displayed in the test result display window.

6. Meas Mode

Set the measurement mode to single or continuous. In single mode, the analyzer stops after a specified number of tests. After this, every time when Single is pressed, the system executes specified number of tests and updates the test data. In continuous mode, the analyzer tests continuously.

7. Single

In single mode, the analyzer stops after a specified number of tests. After this, every time when Single is pressed, the system executes specified number of tests and updates the test data.

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Set the parameter related to the tracking generator (TG). The tracking generator provides two working modes: Power Sweep output (when Power Sweep is On) and Fixed Power output (when Power Sweep is Off). The TG function is an option for DSA815 and can only be used when installed. To purchase, please contact RIGOL or your local distributor.

TG is used to enable or disable the TG.

When the TG is enabled, a signal with the same frequency of the current sweep signal will be output from the [GEN OUTPUT 50Ω] connector at the front panel. The Power of the signal could be set through the menu. The tracking generator provides two working modes: Power Sweep output (when Power Sweep is On) and Fixed Power output (when Power Sweep is Off).

The TG function is an option for DSA815. To purchase, please contact RIGOL salesman or your local distributor.

TG Level

Set the output power of the signal from the tracking generator. In Power Sweep mode, this parameter indicates the start power of the sweep. You can use the numeric keys, knob or direction keys to modify this parameter. For more details, please refer to “Parameter Setting”.

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Table 2-21 TG level

Parameter

Explanation

Default

-20 dBm

Range

-20 dBm to 0 dBm

Unit

dBm, -dBm, mV, uV

Knob Step

1 dBm

Direction Key Step

10 dBm

Parameter

Explanation

Default

0 dB

Range

-200 dB to 200 dB

Unit

Knob Step

1 dB

Direction Key Step

10 dB

TG Lvl Offset

Assign a certain offset to the output power of the TG when gains or losses occur between the TG output and external device in order to display the actual power value.

Key Points:

 This parameter only changes the readout of the TG output power, rather than

the actual value of it.

 The offset could be either a positive (gain in the external output) or a negative

(loss in the external output).

 You can use the numeric keys, knob or direction keys to modify this parameter.

For more details, please refer to “Parameter Setting”.

Table 2-22 TG Level Offset

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Freq (Hz)

Ampl (dBm)

Start Freq Stop Freq

TG Output

TG Level

Power Range

Power Sweep

Enable or disable the power sweep function.

When enabled, the output power of the TG varies with the sweep rate of the analyzer within the specified sweep frequency range (from start to stop frequency) and increases gradually from the specified TG power (see “TG ”) within the specified power range (see “Power Range”). When disabled, the TG output is fixed at the specified power (see “TG ”).

Note: this function in not available in zero span mode.

Figure 2-12 Power Sweep

Power Range

Set the output power range of the TG in power sweep mode. This parameter together with the TG level forms the boundary parameters in power sweep mode. You can use the numeric keys, knob or direction keys to modify this parameter. For more details, please refer to “Parameter Setting”.

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Table 2-23 Power Range of TG

Parameter

Explanation

Default

0 dB

Range

0 dB to 20 dB

Unit

Knob Step

1 dB

Direction Key Step

10 dB

Normalize

Eliminate the error of TG Level. Before using this function, connect the [GEN OUTPUT 50 Ω] output terminal of the TG with the [RF INPUT 50 Ω] input terminal of the analyzer.

1. Stor Ref

Save the data of Trace 1 to Trace 3 as the reference value for normalization. This operation should be done before you enable the normalization.

2. Normalize

Enable or disable the normalization. When enabled, the reference trace will be stored automatically after the current sweep finishes if no reference trace is stored before. During storing the reference trace, the corresponding prompt message is displayed. When normalization is enabled, the corresponding value of the reference trace will be substracted from the trace data after every sweep.

3. Norm Ref Lvl

Adjust the vertical position of the trace on the screen when normalization is enabled.

 Being different from the Ref Level function in the AMPT menu, this

parameter has no influence on the reference level of the analyzer.

 You can use the numeric keys, knob or direction keys to modify this

parameter. For more details, please refer to “Parameter Setting”.

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Parameter

Explanation

Default

0 dB

Range

-200 dB to 200 dB

Unit

Knob Step

1 dB

Direction Key Step

10 dB

Parameter

Explanation

Default

100%

Range

0 to 100％

Unit

Knob Step

Direction Key Step

10%

Table 2-24 Reference level under normalization

4. Norm Ref Pos

Adjust the vertical position of the normalization reference level on the screen when normalization is enabled.

 The function of this menu is similar to that of Norm Ref Lvl. When it is

set to 0%, the normalization reference level is displayed at the bottom of

the screen grid and at the top when it is set to 100%.

 You can use the numeric keys, knob or direction keys to modify this

parameter. For more details, please refer to “Parameter Setting”.

Table 2-25 TG reference position

5. Ref Trace

Set whether to display the reference trace or not. If “View” is selected, the reference trace saved (Trace 3) will be shown in “Freeze” type.

Note: When normalization is enabled, the unit of Y-axis is “dB” and will not be influenced by the definition in AMPT  Units, and “(dB)” is displayed under the Y-axis scale in the user interface.

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Measurement Settings

Tip

VSWR bridge and TG are required in VSWR measurement. Therefore, this function is only available when the VSWR measurement kit, VSWR bridge and 1.5 GHz TG are installed. Enable the VSWR measurement and the TG and the backlights of Meas and TG at the front panel turns on.

Meas

Provide VSWR and various advanced measurement functions, including T-Power, ACP (Adjacent Channel Power), Chan Pwr (Channel Power), OBW (Occupied Bandwidth), EBW (Emission Bandwidth), C/N Ratio, Harmo Dist (Harmonic Distortion) and TOI (Third Order Intermodulation). For advanced measurement functions, the measurement mode can be single or continuous and you can control the measurement including Restart, Pause and Resume.

VSWR

Turn on or off the VSWR measurement function. This function is an option for DSA815. Turn on the VSWR measurement function, the screen is divided into two windows automatically (the lower window provides the measurement wizard). At this point, you can perform the VSWR measurement according to the wizard. Press

Meas Setup to set the corresponding parameters.

Measurement Function

This function is an option for DSA815 and is only available when the advanced measurement kit is installed. When a measurement function is selected, the screen is divided into two windows with the upper window (the basic measurement window) displaying the sweep trace and the lower window displaying the measurement results.

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1. T-Power

Ths system enters zero span mode and calculates the power within the time domain. The types of powers available include Peak, Average and RMS. Select T-Power and press Meas Setup to set the corresponding parameters.

2. ACP

Measure the powers of the main channel and adjacent channels as well as the power difference between the main channel and each of the adjacent channels. When this function is enabled, the span and resolution bandwidth of the analyzer are adjusted to smaller values automatically. Select ACP and press Meas Setup to set the corresponding parameters.

3. Chan Pwr

Measure the power and power density within the specified channel bandwidth. When this function is enabled, the span and resolution bandwidth are automatically adjusted to smaller values. Select Chan Pwr and press Meas Setup to set the corresponding parameters.

4. OBW

Integrate the power within the whole span and calculate the bandwidth occupied by this power according to the specified power ratio. The OBW function also indicates the difference between the center frequency of the channel under measurement and the center frequency of the analyzer. Select OBW and press Meas Setup to set the corresponding parameters.

5. EBW

Measure the bandwidth between two points on the signal which are X dB below the highest point within the span. Select EBW and press Meas Setup to set the corresponding parameters.

6. C/N Ratio

Measure the powers of the carrier and noise with the specified bandwidth as well as their power ratio. Select C/N Ratio and press Meas Setup to set the corresponding parameters.

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7. Harmo Dist

Measure the power of each order of harmonic and THD (total harmonic distortion) of the carrier. The highest order of harmonic available is 10 and the fundamental wave amplitude must be greater than -50 dBm, or else the measurement will be invalid. Select Harmo Dist and press Meas Setup to set the corresponding parameters.

8. TOI

Measure the parameters of the TOI production of two signals with the same amplitude and similar frequency. Those parameters include the frequencies and amplitudes of the Base Lower, Base Upper, 3rd Order Lower and 3rd Order Upper signal, as well as the Intercepts of both the Base Lower and Base Upper. Select TOI and press Meas Setup to set the corresponding parameters.

Restart

Re-execute the active or suspended measurement. This setting is only available for advanced measurement functions.

Pause

Suspend the measurement after the current measurement is finished. The

measurement data stops updating, but the sweep continues. is displayed in the measurement result display window. This setting is only available for advanced

measurement functions.

Resume

Resume the suspended measurement and the measurement data begins updating

again. is displayed in the measurement result display window. This setting is only available for advanced measurement functions.

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Meas Mode

Set the measurement mode to single or continuous. In single mode, the analyzer stops after a specified number of measurements. After this, every time when Single is pressed, the system executes specified number of measurements and updates the measurement data. In continuous mode, the analyzer measures continuously. This setting is only available for advanced measurement functions.

Single

In single mode, the analyzer stops after a specified number of measurements. After this, every time when Single is pressed, the system executes specified number of measurements and updates the measurement data. This setting is only available for advanced measurement functions.

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Meas Setup

Open the parameter setting menu of the function selected in the Meas menu. This key is only available when the function is enabled.

VSWR

Measurement Interface:

Figure 2-13 VSWR Measurement Interface

Measurerment Results: return loss, reflection coefficient and VSWR.

This measurement requires the VSWR, VSWR bridge and TG options. Two measurements have to be performed according to the measurement wizard at the lower side of the interface: measurement with the device under test disconnected (represented by trace 2) and measurement with the device under test connected (represented by trace 1). The return loss (represented by the math trace) is determined by the difference of the results of the two measurements and the reflection coefficient and VSWR are determined by the return loss.

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1. Reset

Reset VSWR measurement parameters.

2. Cal Open

Disconnect the device under test and then press this softkey. The instrument executes the first measurerment and the measurement result is represented by trace 2.

3. VSWR

Connect the device under test and then press this softkey. The instrument executes the second measurement and the measurement result is represented by trace 1. At the same time, the analyzer calculates the difference between the two measurement results (represented by the math trace) and calculates the return loss, reflection coefficient and VSWR on the basis of the difference.

4. Marker

Select one marker from the four and the default is marker 1. When a marker is selected, you can set its state. The marker sekected is marked onto the math trace and the measurement result at the current marker is displayed in the measurement wizard. You can use the knob to move the marker to view the measurement results of different positions.

5. Marker State

Set the state of the current marker.

6. Ref Level

Adjust the vertical position of the trace on the screen.

 Being different from the Ref Level in the AMPT menu, this parameter

has no influence on the reference level of the analyzer.

 You can use the numeric keys, knob or direction keys to modify this

parameter.

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Table 2-26 VSWR Ref Level

Parameter

Explanation

Default

0 dB

Range

-200 dB to 200 dB

Unit

Knob Step

1 dB

Direction Key Step

10 dB

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Parameter

Description

Default

Range

1 to 1000

Measurement Result Measurement Parameters

Measurement Control

Start Line Stop Line

T-Power

Measurement Interface:

Figure 2-14 T-Power Measurement Interface

Measurement Result: T-power, namely the power of the signal from the start line to the stop line.

Measurement Parameters: average number, average mode, TP type, start line and stop line.

1. Avg Num

Specify the number of measurement averages used when calculating the measurement result. The default is “Off”. You can use the numeric keys, knob or direction keys to modify this parameter.

Table 2-27 Average Number of T-Power Measurement

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Unit

N/A

Knob Step

Direction Key Step

Parameter

Description

Default

0 us

Range

0 us to Stop Line

Unit

Ks, s, ms, us, ns, ps

Knob Step

Sweep Time/600

Direction Key Step

in 1-1.5-2-3-5-7.5 sequence

2. Avg Mode

Set the average operation mode to “Exp” or “Repeat” and the default is “Exp”.

 When “Exp” is selected, the result is the exponential average of the

current N (N is specified in “Avg Num”) measurement results.

 When “Repeat” is selected, the result is the arithmetic average of the

current N (N is specified in “Avg Num”) measurement results.

3. TP Type

 Peak

Display the power of the signal with the maximum amplitude between the start line and stop line. The detector type is set to “Pos Peak” automatically.

 Average

Display the average power of signals between the start line and stop line. The detector type is set to “Voltage Avg” automatically.

 RMS

Display the mean square root (in power unit) of the voltages of signals between the start line and stop line. The detector type is set to “RMS Avg” automatically.

4. Start Line

Set the left margin (in time unit) of T-Power measurement. The data calculated under this measurement is between the start line and stop line. You can use the numeric keys, knob or direction keys to modify this parameter.

Table 2-28 Start Line for T-Power Measurement

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RIGOL Chapter 2 Front Panel Operation

2-54

Parameter

Description

Default

50 ms

Range

Start Line to Sweep Time

Unit

Ks, s, ms, us, ns, ps

Knob Step

Sweep Time/600

Direction Key Step

in 1-1.5-2-3-5-7.5 sequence

5. Stop Line

Set the right margin (in time unit) of T-Power measurement. The data calculated under this measurement is between the start line and stop line. You can use the numeric keys, knob or direction keys to modify this parameter.

Table 2-29 Stop Line for T-Power Measurement

User’s Guide for DSA800 Series

Chapter 2 Front Panel Operation RIGOL

2-55

ACP

Main Channel Bandwidth

Adjacent Channel Bandwidth

Channel Spacing

Measurement Interface:

Figure 2-15 Adjacent Channel Power Measurement Interface

Measurement Results: Main CH Pwr, Upper and Lower.

 CH Pwr: display the power within the bandwidth of the main channel.  Upper: display the power of the upper channel and the power difference

between the upper channel and the main channel (in dBc).

 Lower: display the power of the lower channel and the power difference

between the lower channel and the main channel (in dBc).

Measurement Parameters: average number, average mode, main channel bandwidth, adjacent channel bandwidth and channel spacing.

1. Avg Num

Specify the number of measurement averages used when calculating the measurement result and the default is “Off”. You can use the numeric keys, knob or direction keys to modify this parameter.

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RIGOL Chapter 2 Front Panel Operation

2-56

Parameter

Description

Default

Range

1 to 1000

Unit

N/A

Knob Step

Direction Key Step

Parameter

Description

Default

2 MHz

Range

33 Hz to 500 MHz

Unit

GHz, MHz, kHz, Hz

Knob Step

Main Channel BW/100, the minimum is 1Hz

Direction Key Step

in 1-1.5-2-3-5-7.5 sequence

Table 2-30 Average Number for ACP Measurement

2. Avg Mode

Set the average operation mode to “Exp” or “Repeat” and the default is “Exp”.

 When “Exp” is selected, the result is the exponential average of the

current N (N is specified in “Avg Num”) measurement results.

 When “Repeat” is selected, the result is the arithmetic average of the

current N (N is specified in “Avg Num”) measurement results.

3. Main CH BW

Set the bandwidth of the main channel and the power of the main channel is the power integral within this bandwidth. You can use the numeric keys, knob and direction keys to modify this parameter.

Table 2-31 Main Channel Bandwidth for ACP Measurement

4. Adj CH BW

Set the frequency width of the adjacent channels.

 The adjacent channel bandwidth is related to the main channel

bandwidth and the range available is from mian channel bandwidth/20 to

mian channel bandwidth× 20.

 You can use the numeric keys, knob or direction keys to modify this

parameter.

User’s Guide for DSA800 Series

Rigol DSA815 User guide

Specifications and Main Features

Frequently Asked Questions

User Manual