Chapter 3. Making Measurements
USM Go Operator’s Manual 95
3.13 DGS Evaluation Mode (cont.)
When the DGS mode is in use, echoes from equally-sized reflectors located at varying depths appear to lie along the DGS Reference Curve.
When operating in DGS mode, the DGS Reference Curve is shown on the display screen. Before using the DGS mode, do the following:
• Calibrate the instrument/probe combination
• Make all required instrument settings related to the pulser, receiver, and material velocity functions
The instrument prevents changes to certain settings after the DGS Reference Echo has been recorded and DGS is turned ON.
3.13.1 Specifying a Probe and Preparing to Record the Reference Echo
Before using the DGS mode to evaluate reflectors in test pieces, the characteristics of the attached probe must be specified, certain
characteristics of the reference standard must be input, and a reference echo must be stored. To specify the probe characteristics:
1. Select the DGS menu on the ACQUIRE menu bar.
2. Select the SETUP submenu, then the PROBE # function. Once activated, this function allows you to choose from a list of available
probe types . These are probes for which probe characteristics are already stored in the instrument, with the exception of the
user-defined probe (PROBE # 0).
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