Specifications

5. Quick Start - Basic Familiarization
Page 28 USN52 L Operating Manual
To free the hand holding the probe, optimize the 1 inch backwall
echo and then press
.
Now you can uncouple the probe without losing either the A-scan
image or the measurement values. This operation is not required
but it demonstrates one benefit of the FREEZE key.
Press
to redisplay the enlarged soundpath measurement so
that the enlarged value display will be stored and recalled. Some
keys and menu functions may be used while the display is frozen
(Section 4.1).
Now find the DATA SET function and select data set number 9:
. To store current settings and A-scan image in data set 9,
press either aligned with the STORE function.
Observe the flashing prompt at the bottom of the screen. Requir-
ing confirmation helps prevent an accidental overwrite of an exist-
ing data set. To store the data set, press
.
To RECALL stored instrument settings, reselect DATA SET 9:
if a change was made. Recall the stored settings and image by
pressing
aligned with RECALL.
Again, observe the flashing prompt at the bottom of the screen.
Recalling a data set automatically changes all of the current
USN52 L control settings to the settings stored in the data set. To
recall the data set, press
.
Recalled images are always frozen (
symbol in the status line).
Press
to deactivate freeze mode.
Return to the BASIC menu: .
Couple the probe to the 1 inch thick block. Press and hold
aligned with DELAY and observe the A-scan. This function is like
the sweep delay control of an analog flaw detector. Set DELAY to
0.000 µs by simultaneously pressing .
Press
to expand the A-scan display horizontally.
Although left and right limit settings (DELAY and RANGE) are un-
changed, zoom mode improves horizontal display resolution. Press
to disable zoom.
The next procedure demonstrates the use of the DAC/ TCG func-
tion by programming a DAC curve using a series of backwall echo
multiples to simulate echoes from discontinuities at depths of 1 to
3 inches.