Delta TraceUsed to view small (or large) changes in the RF spectrum over time. When scanning begins, the first trace is saved as a snapshot. For all subsequent scans, the snapshot trace is subtracted from the current trace and the difference, i.e. ‘delta’, is displayed. Plotting the data in this way makes it easy to detect changes in RF signals that occurred since the initial snapshot and is most useful in environments where RF transmissions change over time.