910-269-EN, Rev. B, June 2011
250 Chapter 13
In RF rectification, the S-scan palette changes to allow for positive and negative
amplitude values.
13.3.2 Video Filtering
The EPOCH 1000 Series allows video filtering in phased array mode. Video filtering is
a digital algorithm that mathematically smoothes the shape of each A-scan. By
smoothing the shape of each acquired A-scan, the instrument produces a smoothed
S-scan image that is easier to interpret.
Video filtering is common in phased array applications to provide a clean S-scan
image. However, this smoothing can obscure small indications from the A-scan. It
is recommended to avoid video filtering in applications where you rely on fine A-
scan interpretation to characterize potential defects.
Figure 13-1 A/S Vert view with Video Filter set to Off (left) and to Low (right)
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