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5.2 GATE 2
IMPORTANT: ANGLE and DAC functions shall be OFF for proper thickness
measurement!!!
5.2.1
Available Modes of GATE 2
GATE 2 measures always against GATE 1, options are:
-
OFF
inactive – not displayed;,
-
THICKNESS AUTO 1P-1P 1
st
peak to 1
st
peak – see 5.2.2 for details;
-
THICKNESS 1P-1P
1
st
peak to 1
st
peak – see 5.2.3 for details;
-
THICKNESS F-F
flank to flank – see 5.2.4 for details;
-
THICKNESS P-P
peak to peak – see 5.2.5 for details.
5.2.2
THICKNESS – AUTO 1P-1P
-
GATE 2 in this mode cannot be moved
– its positioning is automatic.
-
Measuring gate is GATE 1. The
position of first echo peak within
GATE 1 (which exceeds GATE 1 level)
is taken as the reference.
-
Minimum THICKNESS shall be set in
the right side of the GATES menu.
This THICKNESS value (T>x.xx) is
added to position value of first echo found within GATE 1 and determines a zone
to search a second echo. This zone is indicated on the screen as GATE 2 with
variable width, if at least first echo has been found within GATE 1.
-
A first echo peak is now searched within GATE 2. Its position is indicated with
cyan cross. The relative position against the reference is the resulting thickness,
which is displayed in the Status window with dark blue colour.
-
With proper GATE 1 position, width and minimum thickness setting, you can get
automatic thickness gauge, operating within wide range, which doesn’t require any
operator’s intervention.
-
If measured values are very unstable and their variation exceeds certain limit, then
minimum measured value will be displayed, because highly probably there is
some unwanted echo within the gate, which interferes with measuring.
