166 Keysight InfiniiVision 2000 X-Series Oscilloscopes User's Guide12 Acquisition ControlSee Also • Chapter 11, “Trigger Mode/Coupling,” starting on page 147High Resolution Acquisition ModeIn High Resolution mode, at slower time/div settings extra samples are averagedin order to reduce random noise, produce a smoother trace on the screen, andeffectively increase vertical resolution.High Resolution mode averages sequential sample points within the sameacquisition. An extra bit of vertical resolution is produced for every factor of 2averages. Random noise is reduced by ½ for every factor of 4 averages. Thenumber of extra bits of vertical resolution is dependent on the time per divisionsetting (sweep speed) of the oscilloscope.The slower the time/div setting, the greater the number of samples that areaveraged together for each display point.High Resolution mode can be used on both single-shot and repetitive signals andit does not slow waveform update because the computation is done in theMegaZoom custom ASIC. High Resolution mode limits the oscilloscope's real-timebandwidth because it effectively acts like a low-pass filter.Figure 27 128 Averages used to reduce random noise
