Agilent Technologies N2781A Guia do Utilizador descarregar pdf (Página 148)

148 Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide

11 Acquisition Control

• Normal — at slower time/div settings, normal decimation occurs, and

there is no averaging. Use this mode for most waveforms. See

"Normal Acquisition Mode" on page 148.

• Peak Detect — at slower time/div settings, the maximum and minimum

samples in the effective sample period are stored. Use this mode for

displaying narrow pulses that occur infrequently. See "Peak Detect

Acquisition Mode" on page 148.

• Averaging — at all time/div settings, the specified number of triggers

are averaged together. Use this mode for reducing noise and

increasing resolution of periodic signals without bandwidth or rise

time degradation. See "Averaging Acquisition Mode" on page 151.

• High Resolution — at slower time/div settings, all samples in the

effective sample period are averaged and the average value is stored.

Use this mode for reducing random noise. See "High Resolution

Acquisition Mode" on page 153.

Normal Acquisition Mode

In Normal mode at slower time/div settings, extra samples are decimated

(in other words, some are thrown away). This mode yields the best display

for most waveforms.

Peak Detect Acquisition Mode

In Peak Detect mode, at slower time/div settings when decimation would

normally occur, minimum and maximum value samples are kept in order

to capture infrequent and narrow events (at the expense of exaggerating

any noise). This mode displays all pulses that are at least as wide as the

sample period.

For InfiniiVision 2000 X-Series oscilloscopes, which have a maximum

sample rate of 2 GSa/s, a sample is taken every 500 ps (sample period).

See Also • "Glitch or Narrow Pulse Capture" on page 149

• "Using Peak Detect Mode to Find a Glitch" on page 150

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Agilent Technologies N2781A Guia do Utilizador Página 148