A vertical red line is displayed on the plot at each frequency data point for which the coherence of the transfer function data falls below a user-specified Coherence Threshold. The threshold is set using the Coherence Threshold control that appears below the plot when Coherence is selected. The Coherence calculation is very sensitive to the number of averages used. With larger numbers of averages, the overall coherence tends to decrease.
Coherence is a toggle command.
Repeat the command or click the button again to return to real-time Transfer Function processing.