Gammex 403 GS LE, Руководство пользователя

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3. Measure and record the echo level of each target.
4. Measure and record the echo level of the background material directly beside the
anechoic target. Use as close to the same ROI as the target as possible. Un-
freeze the image.
5. Perform this process three times and record the average echo level for each grey
scale target and for the background material on the data sheet.
Analysis
Contact your service engineer if target 2, 3, or 4 varies from the baseline by 10% or
more.