Chapter 3. Making Measurements
100 USM Go Operator’s Manual
3.13.4 Evaluating Results in DGS Mode
After the DGS curve is recorded and displayed, by turning DGS mode ON, echoes are automatically compared to the recorded reference.
There are three ways this comparison can be made and two additional DGS-related results that can be displayed:
• A%rA - Amplitude of the signal crossing Gate A as a percentage of the corresponding DGS curve amplitude.
• dBrA - dB equivalent height difference between the signal crossing Gate A and the corresponding DGS curve height.
• ERS - Evaluates the reflected echo and calculates the Equivalent Reflector Size.
• Gt - DGS test gain, which initializes the DGS curve maximum height at 80% FSH.
• Gr - DGS reference gain, which represents the instrument gain at which the reference echo peak reaches 80% FSH.
To aid in interpreting the DGS mode display, the instrument displays up to four curves representing fixed-gain offsets from the DGS curve.
These curves are enabled and positioned, by specifying the dB-equivalent amount they are offset above or below the DGS curve, by
accessing the OFFSETS submenu in the DGS menu.
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