Acquisition Control 13
Keysight InfiniiVision 3000T X-Series Oscilloscopes User's Guide 227
See Also • Chapter 12, “Trigger Mode/Coupling,” starting on page 207
• “Averaged Value" on page 119
High Resolution Acquisition Mode
In High Resolution mode, at slower time/div settings 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 2
averages. Random noise is reduced by ½ 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 oscilloscope.
The slower the time/div setting, 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.
Realtime Sampling Option
With the 3000T X-Series 1 GHz and 1.5 GHz bandwidth models, you can turn off
Realtime sampling and switch to equivalent time sampling. (Realtime sampling is
always on for the lower bandwidth models, and there is no option for turning it
off.)
Sweep speed Bits of resolution
≤ 1µs/div
8
2µs/div 9
5µs/div 10
10 µs/div 11
≥ 20 µs/div
12
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