7 Acquisition Modes
228 InfiniiVision 7000B Series Oscilloscopes User’s Guide
Peak Detect Mode
In Peak Detect mode at slower sweep speeds, minimum and maximum
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 (see Table 7).
See also “Glitch or Narrow Pulse Capture” on page 119.
High Resolution Mode
In High Resolution mode, at slower sweep speeds extra samples are
averaged in order to reduce random noise, produce a smoother trace on
the screen, and effectively increase vertical resolution.
High Resolution mode averages sequential sample points within the same
acquisition. An extra bit of vertical resolution is produced for every factor
of 4 averages. The number of extra bits of vertical resolution is dependent
on the time per division setting (sweep speed) of the scope.
The slower the sweep speed, the greater the number of samples that are
averaged together for each display point.
High Resolution mode can be used on both single- shot and repetitive
signals and it does not slow waveform update because the computation is
done in the MegaZoom custom ASIC. High Resolution mode limits the
oscilloscope's real- time bandwidth because it effectively acts like a
low- pass filter.
Table 7 InfiniiVision Series Oscilloscope Bandwidths, Maximum Sample Rates,and
Sample Periods
Bandwidth Maximum
Sample Rate
A sample is taken every
(sample period)
100MHz 2GSa/s 500ps
350MHz 2GSa/s 500ps
500MHz 4GSa/s 250ps
1GHz 4GSa/s 250ps
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