Rigol DS6104 Administrator Guide

RIGOL TECHNOLOGIES USA INC

877-4-RIGOL-1 How-To Guide

[email protected]m

www.rigolna.com



Oscilloscope

SignalAnalysis

UsingFFTs

Application Notes

Comparison Guides

FAQs

How-To Guides

Programming Manuals

Quick Start Guides

Support Information

User’s Guides

RIGOL TECHNOLOGIES USA INC

877-4-RIGOL-1 How-To Guide

[email protected]

www.rigolna.com



FastFourierTransformswithRigolOscilloscopes



FFT(FastFourierTransform)isaprocesswhichconvertsatime‐domain

signalintoitsfrequencydomainequivalent.Commonapplicationsforusage

ofFFTwaveformsare:



zMeasuringharmoniccontentanddistortioninsystems

zCharacterizingnoiseinDCpowersupplies

zAnalyzingvibration



Howtoobtainawaveform'sFFT?



InthisexampleanFFTwillbegeneratedforthe1KHzsquare

waveacquiredonChannel1asseenbelow.Thissignalcanbe

duplicatedonanyRigolscopebyattachingtheprobetothesquare

wavegeneratorportonthefrontoftheinstrument.Onceyoudo

that,pushAUTOthenyouwillseethis:



RIGOL TECHNOLOGIES USA INC

877-4-RIGOL-1 How-To Guide

[email protected]

www.rigolna.com



Pressthe“MATH”button,amenuwillappearontheside,thenselectFFT

andsetthesourcetoChannel1:



AFastFourierTransformofthecurrentsignalonChannel1willappearinthe

Purplecolorbelowthesquarewave.



RIGOL TECHNOLOGIES USA INC

877-4-RIGOL-1 How-To Guide

[email protected]

www.rigolna.com



TheFFTcanbedisplayedfullscreenwiththechannelaswellbyadjusting

theWINDOWsetting.However,youliketoviewittakenoticeofthe

separateVERT/divandHORIZ/divsettingsshowninpurple.Youcanadjust

thesebypushingtheMATHbuttonandthenusingthehorizontaland

verticalscaleknobs.IftheFFTisn’tshownonthescreen,movetheVERTICAL

positionknobuntilyouseethezeropointandthenthesignal.



TherearetwooptionsforverticalunitsontheFFT:mVrmsand

dBVrms.Whenlookingtoviewsmallsignalsalongwithmuchlargersignals

dBVrmsisbeneficialbecauseitprovidesalogscale.Forthosenotusedto

logarithmicscalinglookatthescreenshotabove.Inthesplitscreenmode

shownthereare8verticaldivisionsdedicatedtotheFFT.Herearethevalues

atthetopofeachdivisiongiventhe200mVrms/divsettingandtheposition

ofthezeromarkerontheleftatthetopofthebottomdivision:



DivisionsdownfromtopofFFT

screen

Valueattopofthatdivision

0(topofpurpledisplay)1.4Vrms

11.2Vrms

21Vrms

3800mVrms

4600mVrms

5400mVrms

6200mVrms

70mVrms

8(verybottomofthescreen) ‐200(negativenumbersarenotused

byamVrmsscale)



So,inthismodetheFFThasabout1.4Vrmsoftotalrangecapability.Youcan

changethesensitivity,butifyouwantedtoseea10Vrmsfundamentalanda

10mVrmsharmonicatthesametimeitisn’tpossibleonalinearscale.

RIGOL TECHNOLOGIES USA INC

877-4-RIGOL-1 How-To Guide

[email protected]

www.rigolna.com



IfyouchangetheunitstodBVrms,herearethevalues:



Whenthesettingsare20dBVrms/divandthereferenceismovedtoone

divisiondownfromthetopoftheFFTdisplay:



Divisionsdownfromtop

ofFFTscreen

dBVrmsfromposition

marker

Valueattopofthat

division

0+10dBVrms 3.16Vrms

10dBVrms 1Vrms(attheposition

marker)

2‐10dBVrms .316Vrms

3‐20dBVrms .1Vrms

4‐30dBVrms .0316 Vrms

5‐40dBVrms .01 Vrms

6‐50dBVrms .00316mVrms

7‐60dBVrms .001mVrms

8‐70dBVrms .000316mVrms



Tounderstandthisfully,theformulatoderivethedBVrmsvalueisasfollows:

dBVrms=20*log(Vrms/VREF)



whereVREFinthiscaseis1Vrms,soitcanbesimplifiedto:



dBVrms=20*log(Vrms)



Consequently,whenlookingataspotonthescreenthatisknowntobeX

dBVrmstheactualVrmsvalueexpressedbysignalatthatlocationis:



Vrms=10^(X/20)

Forexample,‐20dBVrms=10^‐1=0.1Vrms

RIGOL TECHNOLOGIES USA INC

877-4-RIGOL-1 How-To Guide

[email protected]

www.rigolna.com



Sointhiscaseevery20dBisafactorof10xthevoltage.Usually,dBisused

intermsofWattsormilliWatts(dBm)inwhichcaseevery10dBisafactorof

10xthepower,butbecauseoftherelationshipbetweenpowerandvoltage

notethat20dBisafactorof10onyourscopesdisplay.



ThehorizontalunitsperdivisionoftheFFTarealwaysinfrequency.The

abovescreenshotshows1.25KHzperdivision.Inthisdisplay,theleftsideof

thescreenisalwaysatDCor0Hz.Eachdivisiontotherightthenmarksthe

setvalue.Inthiscasethedivisionswouldbe0Hz,1.25KHz,2.5KHz,3.75

KHz,5KHz,andsoon.



Howtosaveawaveform'sFFT?



TosaveanFFTtothescopeoraUSBdrive,theFFTmustbesavedasa

referencewave“REF”asinthefollowingprocedure:

Pressthe“REF”button.Whenthesidemenuappears,setthesourcetobe

theFFT.Thenusethe“Save”optioninthemenutosavelocallyorexternally.



RIGOL TECHNOLOGIES USA INC

877-4-RIGOL-1 How-To Guide

[email protected]

www.rigolna.com



Tosavethewaveform,selectsave.



TosavetheFFTwaveformtoaUSBdrivepressthe

“Location”buttontheLocationnowswitchesto

“External”asinthefigurebelow:



Uponselecting“Save”selectthefiletosavethewaveformtoandthenexit

uponcompletion.



Referencewaveformscanthenberecalledatalatertimetocomparesignals.

RIGOL TECHNOLOGIES USA INC

877-4-RIGOL-1 How-To Guide

[email protected]

www.rigolna.com



Insummary,whilenotasaccurateasaspectrumanalyzerorwithasmuch

range,theFFTfunctionoftheoscilloscopecanbeusedtoviewthe

frequencydomaininformationforasignal.Withavarietyofcapabilitiesto

changeranges,units,anddisplaymodeaswellassavingandrecalling

waveforms,Rigoloscilloscopescanmakefrequencymeasurementseasily

andquicklyusingtheincludedFFTfunction.



Formoreinformationorquestionscontactusdirectlyat:



RigolTechnologiesUSA

7401FirstPlace

SuiteN

OakwoodVillage,OH44146



Youcanreachusdirectlyat:

(440)232‐4488

877‐4‐RIGOL‐1

inf[email protected]om

www.rigolna.com(RigolNorthAmericawebsite)



Other manuals for DS6104

Other Rigol Measuring Instrument manuals

Rigol

Rigol DL3021 User manual

Rigol

Rigol RSA3000E Series User manual

Rigol

Rigol DM3068 User manual

Rigol

Rigol DSA700 series User manual

Rigol

Rigol PCA1500 User manual

Rigol

Rigol VB1080 User manual

Rigol

Rigol DS1000E Series, DS1000D Series Operating instructions

Rigol

Rigol DSA1000 Series User manual

Rigol

Rigol RPL1116 User manual

Rigol

Rigol RP1003C User manual

Rigol

Rigol DSA800E Series User manual

Rigol

Rigol RSA5065 User manual

Rigol

Rigol DM3058 User manual

Rigol

Rigol DS6000 Series Installation and operating instructions

Rigol

Rigol PLA2216 User manual

Rigol

Rigol RSA5065N-OCXO User manual

Rigol

Rigol PHA0150 User manual

Rigol

Rigol RP1000D Series User manual

Rigol

Rigol DSA800E Series Operating instructions

Rigol

Rigol DP821A User manual

Rigol

Rigol PCA1030 User manual

Rigol

Rigol DS Demo User manual

Rigol

Rigol DSA800 Series User manual

Rigol

Rigol DSA1000A Series User manual

Popular Measuring Instrument manuals by other brands

Suaoki

Suaoki D40 user manual

Elster

Elster BK-G1.6 operating instructions

Endress+Hauser

Endress+Hauser Deltabar FMD71 technical information

Duratool

Duratool D03128 manual

Vega

Vega VEGAPULS 65 Quick setup guide

Tonghui

Tonghui TH2618B Operation manual

Tenmars

Tenmars TM-801 user manual

MSR

MSR 145 user manual

TPS

TPS WP-82 manual

ELMETRON

ELMETRON CP-511 user manual

PCB Piezotronics

PCB Piezotronics 003C30 Installation and operating manual

Tenma

Tenma 72-10465 manual

Endress+Hauser

Endress+Hauser Proline Promag 50 Brief operating instructions

Siemens

Siemens SITRANS F Coriolis FCT030 Function manual

KLINGER

KLINGER CMF V Series instruction manual

EXFO

EXFO FTB-2 Notice

Keysight

Keysight M8290A Getting started guide

ADTEK

ADTEK MW-5 operating manual