Agilent Technologies InfiniiVision 7000 Series Manuel d'utilisateur télécharger pdf (Page 6)

Why does a fast update rate matter?

While bandwidth, sample rate and memory depth are key criteria for

deciding which scope to purchase, an equally important characteristic

is update rate.

What is update rate?

Update rate is how many waveforms acquisitions per seconds you

scope can acquire, process, and display. Oscilloscope “dead-time” is

the time it takes for a scope to process and then display an acquired

waveform before re-arming it’s triggering for the next acquisition. For

traditional scopes, this time is often orders of magnitude greater than

acquisition time on fast time-per-division settings.

If a glitch occurs during the scope’s dead-time, it won’t be captured.

The key to improving the probability of capturing a signal anomaly

during the scope acquisition time is to minimize dead-time.

Oscilloscope vendors usually specify what their scope’s “best-case”

waveform update rates are. Some scope architectures suffer from

factors that can seriously degrade the “best-case” update rates spec.

Agilent’s 7000 Series architecture delivers the world’s fastest update

rate when using:

•

Analog channels

•

Analog and digital

•

Deep memory

•

Serial decode

Why is update rate important?

1. Responsiveness. If you rotate the timebase control, you expect

the oscilloscope to respond immediately – not seconds later after

the scope ﬁ nishes processing data.

2. Signal detail. Fast waveform update rates improve the display

quality of the waveform that you see on screen.

3. Certainty. Fast waveform update rates improve the scope’s prob-

ability of capturing random and infrequent events.

Update rates directly affect a scope probability of capturing and dis-

playing infrequent and random events. Slow update rates will cause a

scope to miss subtle or infrequent signal details.

Improves instrument responsiveness

Improves scope display quality

Improves probability of capturing

infrequent events

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Agilent Technologies InfiniiVision 7000 Series Manuel d'utilisateur Page 6