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With limited space available, some menu items are abbreviated. None-the-less, abbreviations
and acronyms represent terms familiar to qualified ultrasonic NDT personnel. TG400 is based upon a
powerful microcomputer, combining the absolute latest in high-speed digital electronics technology
and high capability ultrasonic instrument features. TG400 software has been designed with the needs
of NDT personnel foremost in mind; complex, computer-like terminology and operations have been
purposely avoided. The following is a description of each Menu item(s) and its associated sub-
functions.
2.2 MENUS
Menu items are arranged Horizontally along the bottom margin of the display as shown in Figure 2.1.
Whenever a Menu is displayed, an active A-trace is also displayed. The highlighted menu item can
either be selected (to reveal related sub-functions) or changed by appropriate keying of the arrow
keys. In some highlighted Menu items, variables can be changed without having to select sub-
functions. These items will display a Upon its selection. If an item has a sub menu selection the
display will read “ENTER TO SELECT”
MAIN MENU (MENU/ESC Keypad Selection)
The functions grouped in the
MAIN
menu are used to select TG400 basic setup parameters. These
items are logically among the first to be addressed during a new setup. Last setup/factory default
values are automatically displayed. Even though the defaults permit many kinds of ultrasonic tests
using many kinds of transducers to be successfully performed, highly precise flaw detection tests may
require refinements to the default variables to better match transducer/instrument characteristics.
GAIN
Used to adjust the amplitude of the A-trace display. Increasing or Decreasing the GAIN will
cause the A-trace signal to increase or decrease in amplitude. (Directly Adjustable via up or
down arrow)
ZERO ADJUST
(Zero)
A fine delay function which allows for compensation of transducer wearsurfaces, coupling
membranes and angle beam wedge. Adjustment is continuous from 0 to 20,000 nanoseconds.
(Directly Adjustable via up or down arrow)
VELOCITY
(VEL)
Sets the material velocity (inches/microsecond or mm/microsecond) used in calculations of
thickness. NOTE: The VELOCITY value will be decreased by approximately one-half from
reference velocity when ANGLE MODE is selected. (Directly Adjustable via up or down arrow)
DELAY
(DLY)
Used to adjust the start of the A-trace display along the horizontal axis. Gates that are synchro-
nized with the A-trace will also delay accordingly. (Directly Adjustable
via up or down arrow)
RANGE
(RNG)
Used to determine how much time (distance) is represented on the
horizontal axis of the A-trace display. Increasing or Decreasing the
RANGE will cause the A-trace display to expand or contract. (Directly
Adjustable via up or down arrow)
THRESHOLD
(THRESH)
Allows Increase or Decrease the Measurement Threshold level. Any
echo or echo half cycle with amplitude equal to or greater than the
Thickness Gate Threshold will be measured. The threshold gate is
the bar on the left of the A-Trace frame extending to the first echo in
