Figure 11-8 A Small Range Dac; Gain Adjustment Options - Olympus EPOCH 650 User Manual

DMTA-10055-01EN, Rev. A, February 2015
11.2.3

Gain Adjustment Options

The EPOCH 650 ultrasonic flaw detector DAC/TCG software features three separate
types of gain adjustment for each DAC/TCG setup. These gain adjustments allow for
better inspection precision, easy manipulation of curves and live peak information,
and transfer correction.
11.2.3.1 Scanning Gain
In order to quickly find and identify potential defects, it is commonly required by
code to increase the gain (scanning gain) on the EPOCH 650 from the reference
(calibration) gain for scanning purposes. However, once a potential defect is
identified, this gain is usually removed to view the reflector at Ref gain level, set at
calibration. The DAC/TCG software is fully capable of adding temporary scanning
gain for inspection purposes. This scanning gain only affects the live A-scan and does
not adjust the level of the DAC curve(s) set up on screen.
To add temporary scanning gain
1. Press dB.
234 Chapter 11

Figure 11-8 A small range DAC