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EPOCH 4PLUS
Figure 37 IIW Calibration Block with 0.060" Diameter Drilled Hole
2. Move the probe forward and backward until you have “peaked up” the return signal
from the hole (that is, found the maximum amplitude). Do not confuse the reference
reflector echo from the side of the block.
Tip: The Peak Memory feature on the EPOCH 4PLUS is an excellent tool to aid
in finding the peak of the signal.
3. Adjust the system sensitivity (Gain) up or down once the echo is peaked up 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 [2nd F], [GAIN] (REF) to lock in the reference gain level and add/subtract
scanning gain separately.
5. Press the function keys once the reference gain functions are activated to select
between adding or subtracting in 0.1dB or 6.0 dB increments.
Figure 38 Locking the Reference Gain to Add/Subtract Scanning Gain
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