Checkline TI-MVX User Manual
Page 28
5.3
Factory Setup Chart
Num Name
Comment 1
Gn/AGC
Velocity
1
STEEL BASIC
45
0.2330 in/uSec
2
STEEL THRU PNT STD
_ 5MHZ HD
15
0.2330 in/uSec
3
STEEL THRU PNT EXT
_ 3MHZ HD
14
0.2330 in/uSec
4
ALUMINUM W/GATE
_” 7.5MHZ
45
0.2510 in/uSec
5
PLASTIC W/GATE THK
_ 1MHZ CPZT
45
0.0940 in/uSec
6
PLASTIC BASIC
_ 2.25MHZ
45
0.0940 in/uSec
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5) Press the UP and DOWN arrow keys to scroll the highlighted value.
6) Press the LEFT and RIGHT arrow keys to scroll the digit locations.
7) Repeat steps 5 & 6 until the gain number is correctly displayed.
8) Press the OK key to set the Gate 1 value and return to the menu screen, or
ESC to cancel entering the Gate 1 value.
9) Finally, press the MEAS key to return to the measurement screen and begin
taking readings.
Gate 2
The GATE 2 HOLDOFF is only used in the echo-echo mode. Note: The TI-MVX
must be in E-E (echo-echo) mode to be activated. GATE 2 is sometimes called a
Hold-Off or Delay. The function of the GATE HOLDOFF is to prevent the second
gate from triggering on noise associated with ring down of the first echo. The
GATE 2 HOLDOFF is visible as the distance from the end of GATE 1 at the first
detect, to the start of GATE 2 as display by the horizontal bars on the display. A
further explanation suggests the HOLDOFF is a time delay that simply extends
the end of GATE 1 further out in time to prevent GATE 2 from starting. This is
commonly used to avoid detecting interface noise or transducer ring down. The
diagrams below provide a visual example of the gates, followed by the proce-
dures to adjust the gates for different applications:
Adjusting Gate2 using the Hot Menus
1) Press the MEAS key once to activate measure
menu items. Press the MEAS key multiple times
to move right and the ESC key multiple times to
move left, until the GATE2 cell is highlighted.
2) Press the UP, DOWN, LEFT, and RIGHT
arrow keys to scroll the highlighted value.
3) Alternatively, press the ENTER key to display
the Digits Edit Box.
4) Press the UP and DOWN arrow keys to scroll
the highlighted value.
5) Press the LEFT and RIGHT arrow keys to
scroll the digit locations.
6) Repeat steps 4 & 5 until the GATE2 value is correctly displayed.
7) Press the OK key to return to the measurement screen, or ESC to cancel
entering the GATE 2 value.
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