Acquisition Modes; At Slower Sweep Speeds; Normal Mode - Agilent Technologies 6000 Series User Manual

Acquisition Modes

At Slower Sweep Speeds

Normal Mode

6000 Series Oscilloscope User's Guide
The 6000 Series oscilloscopes have the following acquisition
modes:
• Normal — for most waveforms (with normal decimating at
slower sweep speeds, no averaging).
• Peak Detect — for displaying narrow pulses that occur
infrequently (at slower sweep speeds).
• Averaging — for reducing noise and increasing resolution (at
all sweep speeds, without bandwidth or rise time
degradation).
• High Resolution — for reducing random noise (at slower sweep
speeds).
Realtime sampling (where the oscilloscope produces the
waveform display from samples collected during one trigger
event) can be turned off or on in the Normal, Peak Detect, and
High Resolution modes.
At slower sweep speeds, the sample rate drops because the
acquisition time increases and the oscillosope's digitizer is
sampling faster than it needs to fill memory.
For example, suppose an oscilloscope's digitizer has a sample
period of 1 ns (maximum sample rate of 1 GSa/s) and a 1 M
memory depth. At that rate, memory is filled in 1 ms. If the
acquisition time is 100 ms (10 ms/div), only 1 of every 100
samples is needed to fill memory.
In Normal mode at slower sweep speeds, extra samples are
decimated (in other words, some are thrown away). This mode
yields the best display for most waveforms.
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