Specifications

5. Quick Start - Basic Familiarization
Page 26 USN52 L Operating Manual
5.3 Using Functions and Keypad Controls
To begin this exercise, the selected menu should be BASIC. If
necessary, select the BASIC menu:
.
The second item in the BASIC menu is RANGE. It controls the
horizontal range of the A-scan display. Press of the
corresponding INCREMENT/DECREMENT key to view the 9
discrete RANGE steps from 0.200 to 200.0 inches of test
material. This is
coarse mode.
Now cover (aligned with RANGE) with your right thumb and
simultaneously press both arrows to switch to
fine mode. “RANGE”
is now “range” (lower case).
Press and hold either
. Notice that now the range value
changes in 0.001 inch steps. The rate accelerates as you hold the
key. If you release the key for less than a second, adjustment
resumes at an accelerated rate.
Switch back to coarse RANGE mode (press both arrows of
simultaneously) and set RANGE to 2.500 inches: .
Now find MTL VEL (material velocity). The unit is factory preset at
2330in/s (233,000 inches per second; a 10
2
multiplier is implied).
Press
. Velocity has changed to 1320in/s. This is the second
factory preset value. In
coarse mode pressing simply toggles
the material velocity between these 2 values.
Now cover
(aligned with MTL VEL) with your right thumb and
simultaneously press both arrows to switch to
fine mode (lower
case “mtl vel”). Pressing
now changes the value in incre-
ments of 1.
Switch back to coarse MTL VEL mode (press both arrows of
simultaneously) and set velocity to 2330in/s: .
Apply some couplant to your test block and couple the probe. If
you are using a 1 inch thick steel block, the backwall echo should
be at about the 4th vertical division in the A-scan.
Find the GAIN function and press a few times. Amplitude
changes are large because dB STEP is at the default value of
6.0, as indicated by the small number in the upper right corner of
the GAIN box.