Figure 9-24 The Iiw Block With Probe Facing Sensitivity Hole - Olympus EPOCH 650 User Manual

DMTA-10055-01EN, Rev. A, February 2015
Side-drilled
hole used
for
sensitivity
calibration

Figure 9-24 The IIW block with probe facing sensitivity hole

2. Move the probe backward and forward to maximize the amplitude of the echo
from the hole. Do not confuse the reference-reflector echo from the side of the
block.
Press PEAK MEM to use the Peak Memory feature to help find the peak of the
signal.
3. Once the echo amplitude is maximized, adjust the system sensitivity (gain) to
bring the reference-reflector signal to a predetermined reference line on the
screen. In this example, the echo is brought to 80 % of full-screen height.
4. Press 2 ND F, (REF dB) to lock in the reference-gain level and add/subtract scanning
gain separately.
5. Use the Add, Scan Db, +6 dB, −6 dB, and Off parameters to make scanning gain
adjustments once the reference gain (Ref) is active (see Figure 9-25 on page 175).
For more information on these functions, see "Setting Reference Gain and
Scanning Gain" on page 106.
174 Chapter 9