Resolution enhancement is a technique for increasing the effective vertical resolution of the scope at the expense of high-frequency detail. Selecting resolution enhancement does not change the scope's sampling rate or the number of samples available.
For this technique to work, the signal must contain a very small amount of Gaussian noise, but for many practical applications this is generally taken care of by the scope itself and the noise inherent in normal signals.
The resolution enhancement feature uses a flat moving-average filter. This acts as a low-pass filter with good step response characteristics and a very slow roll-off from the pass-band to the stop-band.
Some side-effects will be observed when using resolution enhancement. These are normal and can be counteracted by reducing the amount of enhancement used, increasing the number of samples captured or changing the timebase. Trial and error is usually the best way to find the optimum resolution enhancement for your application. The side-effects include:
Widened and flattened impulses (spikes)
Vertical edges (such as those of square waves) turned into straight-line slopes
Inversion of the signal (sometimes making it look as if the trigger point is on the wrong edge)
A flat line (when there are not enough samples in the waveform)
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