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Display range
Display range can be switched from a fixed reference interval to one that automatically adjusts to the current range of spectrum magnitude values. The latter is useful as a set and forget setting and works well to display the most vertical detail, at the expense of losing the ability to visually compare the current values to a reference level.
dB Min / dB Max
Sets the minimum and maximum magnitude to display, in decibels. This is visible the range of the display that is taken into account when auto-range is off.
Default range is -18dB (min) to -114dB (max).
Range mode
Default is Manual.
Manual
Uses a fixed range as specified by the above settings.
Auto
When engaged, auto-range continuously adjusts the display to the current range of the data.
A slight envelope is applied to the auto-range values in order to improve legibility, avoiding the display to follow every minor change. Peaks are always registered however, as these provide valuable information that should not be missed.
Compressed
The range is defined by dB Min/Max values, and the Y-axis is also compressed in the lower range. This can bring out peaks and valleys in the spectrum to better visualize resonant frequencies and such.
Compressed | Auto
Combines Compressed and Auto modes.