GE Ultrasonic USM Go, Operator'S Manual

Page: 107 / 190

Chapter 3. Making Measurements
USM Go Operator’s Manual 89
3.10 Adjusting DAC or TCG Display and Adding Offsets
After the DAC or TCG curves are displayed, the addition of guidelines offset from the reference line by a fixed or variable dB value
provides enhanced evaluating capabilities. Similarly, the TRANSFER CORR function applies dB compensation for the difference in
coupling conditions between the known standard and the test piece.
3.10.1 Defining DAC or TCG Curve Offsets (DAC/TCG-OFFSETS-MODE)
To add a series of guidelines, offset from the
DAC
or
TCG
curve by a definable dB increment (but not exceeding ± 24 dB from the reference
curve):
1. Access the
OFFSETS
submenu in the
DAC/TCG
menu.
2. Set the
MODE
function to
FIXED
for evenly spaced offset lines or to
CUSTOM
for user-controlled offset line placement. Set this
function to
OFF
to remove offset lines from the display.
3. If
FIXED
offset
MODE
is selected, set the
OFFSET
function to the dB increment at which offset lines are drawn above and below the
DAC
or
TCG
line.
4. If
CUSTOM
offset
MODE
is selected, access the
OFFFSETS2
submenu and input the positive or negative offset at which each of up
to four guidelines are drawn.