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18 GATES
Your gauge is equipped with two gates which control the time measurement process and which play
an important role in the detection and measurement of a flaw. Detections are only made within the
boundaries of a gate. Anything outside of the start and range/width of the gate will be ignored. The
height of a gate is also a threshold, and controls the level of sensitivity. The gates can be adjusted
to a specific reference height, based on a predetermined reflector, and set to act as an alarm during
the inspection process.
Using
gates
to
adjust
measurement process allows you to
measure a specific region on and
between waveforms. For example, a test
block with a target size and depth is
optimised on the display with a signal
amplitude at 70% full screen height. The
inspector wants to know about any
defects during the inspection that are
greater than or equal in size to the
calibrated test specimen. A gate is then
enabled and set to a reference height of
70%. The width and range are adjusted
to cover the range tested, and you are
then ready to conduct the inspection.
The two gates are fully independent. Each gate has a start and stop or width, a threshold, a polarity
switch, and a detect option. Both gates can be enabled and set for different detects and polarities,
and can be positioned anywhere on the display independent of one another.
The screenshots show a rectified waveform without a gate (disabled) and with a gate enabled. The
enabled gate is shown as a horizontal line on the display.
Each gate has the following settings:
Setting
Values
ALARM
ON
OFF
AUDIBLE
DETECT
ABOVE
BELOW
GATE#
Numerical
value
GATE# WIDTH
Numerical
value
35
the
time
Gate Disabled
Function
Enables the gate and flashes the red light on the front of the
gauge when the waveform breaks the threshold level, either
above or below, depending on the current DETECT setting.
Disables the gate.
When disabled, all the other menu items are greyed out.
Has the same function as ON, but sounds a beeper as well as
flashing the red light.
Triggers the alarm when a signal is equal to or greater than the
height of the gate.
Triggers the alarm when a signal is equal to or less than the
height of the gate.
Sets the start position of the gate relative to the horizontal axis
or depth (this is the left boundary of the gate, or where it turns
on).
Sets the width of the gate relative to the horizontal axis or
depth (this sets the right boundary of the gate, or where it turns
off).
Gate Enabled
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