Chapter 3. Making Measurements
USM Go Operator’s Manual 103
3.14 dB REF Evaluation Mode (cont.)
IMPORTANT: Remember that the highest echo in Gate A and the GAIN setting, when dB REF is selected, become the reference amplitude
and gain values for as long as dB REF is activated.
Note: The reference echo amplitude must not exceed 100% of full-screen height.
After dB REF has been activated, the Gain-Display Window lists both the Reference Gain and Incremental Gain levels.
The Reference Gain remains constant throughout the dB REF session while the Incremental Gain value changes with the Gain Toggle.
After dB REF has been activated, any amplitude measurements are stated in relation to the reference echo amplitude. Available amplitude
readings when operating in dB REF mode are:
• dBrA - dB difference between the reference echo and the highest echo to cross Gate A.
• A%rA - Amplitude of the signal crossing Gate A, as a percentage of the reference amplitude.
• dBrB - dB difference between the reference echo and the highest echo to cross Gate B.
• A%rB - Amplitude of the signal crossing Gate B, as a percentage of the reference amplitude.
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