Agilent Technologies InfiniiVision 5000 Series Manuale Utente Scaricare il pdf (Pagina 5)

Why does a fast update rate matter?

Ifthehumaneyehastrouble

discerningabove30-50framesper

second, is there really a difference

between 3,600 and 100,000

waveforms per second?Ifyouknow

whatyou’relookingfor,theanswer

isprobably“no.”However,ifyouare

huntingforunknownsignalanomalies

or characterizing jitter, the answer

is“yes.”

Acquisition time Dead time Dead time

Acquisition time

Figure 3. Reducing the dead time between

acquisitions …

Figure 4. … improves your chances of

finding random events like glitches

5000 Series TDS3000B WaveSurfer 400

Update Rate (waveforms per second)

100,000

10,000

1,000

100

Time Base

ns/div

100

ns/div

µs/div

100

µs/div

Figure 5. Update rates of popular oscilloscopes using their default real-time

acquisition mode

Catchproblemssoonerandcovermoreofyourdebugchecklist–our100,000

waveformspersecondupdateratehelpsyoufindintermittentproblemsupto

100xfasterthancompetitivescopes

Ifyouknowthatthereisaglitch in

your system,it’seasytocaptureit

usingapulse-widthtrigger.However,

ifyouarejustbrowsingthroughyour

design,yourchancesoffindingaglitch

increaseastheoscilloscope’supdate

rateincreases.Ifaglitchoccursduring

the "dead time" between samples,

youmissit(Figure3).WithMegaZoom

IIItechnology,thedeadtimeismuch

smaller(Figure5).Ascopewitha

slowerupdateratewillcapturethe

glitcheventually(ifitrecurs),butmost

engineersandtechniciansdon’thave

the time or patience to wait for their

toolstocatchup.

Ifyouarecharacterizing signal jitter,

afastupdaterategivesyouaccurate

resultssooner.Andwhenthefast

updaterateiscombinedwiththe5000

Series’XGAhigh-definitiondisplay

(1024x768,256intensitylevels),

subtledifferencesintheseacquisitions

becomeobvious.

Andlikeallotheraspectsof

MegaZoomIIItechnology,thisupdate

rateisdeliveredasadefaultreal-time

acquisitionmode.It’s always fast,

always on.

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Agilent Technologies InfiniiVision 5000 Series Manuale Utente Pagina 5

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