Agilent Technologies InfiniiVision 5000 Series Manuale Utente Scaricare il pdf (Pagina 4)

4

Why does deep memory matter?

See more time

Seeing more time is the most easily

understooduseofdeepmemory.The

moresamplesyouacquire,themore

timeyoucanseeataparticularsample

rate.

Longcapturetimesgiveyoubetter

visibilityintocause-effectrelationships

inyourdesign,whichgreatlysimplifies

root-causedebugging.Italsoallows

youtocapturestart-upevents(like

thestart-upsequenceinFigure1)ina

singleacquisition.

Youdon’thavetostitchtogether

multipleacquisitionsorsetprecise

triggering conditions. Spend less

timefindingevents,andmoretime

analyzing them.

See more details

The relationship between memory

depthandacquisitionrateisn’tas

obvious.Allscopeshavea“banner”

maximumsampleratespecification,

butmanycanonlysustaintheserates

at a few timebase settings.

In the case of an oscilloscope with a

5GSa/sacquisitionrateand10-Kptsof

memory(Figure2),those10,000points

can only fill 2 μs of time. Since scopes

have10timedivisions,thesamplerate

dropsatanytime/divsettingbelow

200ns/div.

Asaresult,ifyoulookat“slow/fast”

eventslikeamodulatedsignal,you

runtheriskofaliasingyoursignal.Or

youmaysimplymissoutonimportant

signaldetailswhenyouzoominonit.

Deepmemoryoscilloscopesletyou

sustainahighsamplerateoverlonger

periods of time.

Always fast, always on

MegaZoom III is the third generation of

thefastanddeepmemoryarchitecture

thatAgilentintroducedin1996.It’s

notaspecialmode,unlikeotherdeep-

memoryoscilloscopes.Youhaveaccess

toyourMegaZoommemoryatalltimes.

Andthedisplaywillrespondinstantly

toyourcommandsasyouscalethe

+/divsettingorpanandzoominthe

Delayed(or“zoom”)window.

5 GSa/s, 10k memory 4 GSa/s, 1M memory

Inﬂection occurs at

200 ns/div

Inﬂection occurs at

10 µs/div (20 s with single-shot trigger)

Sample Rate

10 GSa/s

1 kSa/s

1 GSa/s

100 MSa/s

10 MSa/s

1 MSa/s

100 kSa/s

10 kSa/s

Time Base

1

ns/div

10

ns/div

100

ns/div

1

µs/div

10

µs/div

100

µs/div

1

ms/div

10

ms/div

100

ms/div

1

s/div

Figure 2.

Figure 1.

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