Olympus EPOCH 650, User Manual

Page: 283 / 362

DMTA-10055-01EN, Rev. A, February 2015
Software Features and Options 271
11.8 Interface Gate
The EPOCH 650 interface gate (a third gate) is intended for immersion applications
where the water path distance between the front surface of the test material and the
transducer face is continuously changing. The application may involve an “on-line”
type approach with the test material moving steadily past a stationary transducer (or
vice versa). If the front surface of the test material is not uniform, a slight difference in
the water path distance may result. The interface gate option tracks the position of the
reflection from the interface of the water path and test piece and compensates for the
variance in this reflector’s position. The interface gate is also commonly used with
captive water column transducers.
11.8.1 Activating the Interface Gate
When the interface gate option is enabled, the GateIF and GateIF Setup submenus
become available.
To activate the interface gate
1. Navigate to the GateIF menu item (group 2/5).
2. Use the adjustment knob or arrow keys to set the Status to On
When the IF gate is activated, the gate tracking mode of all additional active gates is
automatically set to track to the IF gate. Gate 1 and gate 2 measurements cannot be
made with reference to the calibrated zero point when the IF gate is on, but gate 1
must reference the IF gate. Gate 2 (if used) can be set to track either the IF gate or
gate1.
11.8.2 Adjusting the interface gate
The interface gate is adjusted from the Gate IF menu item.
To adjust the interface gate

Use Gate IF > Start (P2 key), Gate IF > Width (P3 key), and Gate IF > Level
(P4 key), to adjust the BEA gate position.
NOTE