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5.4 GATE 4
5.4.1
Available Modes of GATE 4
-
OFF;
-
ON (positive logic) without any alarm;
-
ON
♪
+ (positive logic) with acoustic alarm;
-
ON
♪
- (negative logic) with acoustic alarm;
-
ECHOSTART – time base start is synchronized with interface echo within
GATE 4;
-
ES+AUX – analog relative position of echo flank (within GATE 4) on ANALOG
OUT1;
-
API 5UE – special function for evaluation of surface indications acc. to API 5UE –
see 7.6. API 5UE Mode – Evaluation of Indications acc. to API 5UE.
5.4.2
Function of GATE 4
Intended use – echo-start for immersion
testing etc.
Functions of GATE 4 are exactly the
same as GATE 3.
GATE 4 “has its own” velocity of sound
propagation. Thus, it is possible to
measure distance in water (or other
liquid) independently on distance in the
material under test.
In addition, there is ECHOSTART
function, which shifts the waveform so,
that the echo within GATE 4 is kept at its
left limit. Thus, variable distance from the
transducer to interface (e.g. immersion
testing) becomes “static” on the screen,
that allows positioning of other measuring
gates to stable positions relative to the
GATE 4 (interface).
The original echo position within the
GATE 4 is indicated with pink cross.
If echo disappears from within the GATE 4, then the waveform is displayed non-
shifted in its original position.
When the last option had been chosen, i.e. EcAUX, then there is a signal on
the AOUT1 output (LEMO Analog Out), with voltage corresponding to relative echo
position within GATE 4 – minU=GATE4_BEGIN, maxU=GATE4_END.
Note: If there is no echo within GATE 4, then maxU is on the output.