15
4
The gate starting point will remain as set, even when width adjustment is made.
Coarse adjustment: half of a lattice
Fine adjustment: 1 pixel space
When the gate exceeds the display range,
as shown in right figure, the measured
value will be shown as “*” on the status
line.
You can also set the selected gate’s starting point using the Quick Search Function. Quick Search
Function is achieved by simply pressing the
and
. Note that the instrument will only search the
echo whose peak crosses the selected gate in this function.
Adjusting a Gate’s Width
You can determine the threshold value of the gates within the range of 0 to 99% FSH (Full Screen Height)
for triggering the LED alarm if this value is exceeded or not reached, depending on the setting of the
LOGIC function.
1
Activate the GATE submenu (located in the BASIC menu).
2
Select the gate to be positioned using the GATE SEL function.
3
Select the gate WIDTH function and adjust its value by turning the knob.
Setting a Gate’s Threshold (Vertical Position)
You can determine the threshold value of the gates within the range of 0 to 99% FSH (Full Screen Height)
for triggering the LED alarm if this value is exceeded or not reached, depending on the setting of the
LOGIC function.
1
Activate the GATE submenu (located in the BASIC menu).
2
Select the gate to be positioned using the GATE SEL function.
3
Select the THRESH function and adjust the vertical height by turning the knob. Increasing and
decreasing the value of the threshold moves the gate up and down, respectively.
Defining B-Gate Alarm Logic
This function allows you to choose the method for triggering the B-Gate alarm.
Gate alarms can be set to trigger when an A-Scan echo crosses the gate (POSITIVE logic) or when no
echo crosses the gate (NEGATIVE logic) within the displayed range.
A-Gate is locked to POSITIVE logic. And
B-Gate can be set to either POSITIVE or
NEGATIVE.
The appearance is different between the
POSITIVE gate and the NEGATIVE gate when
displayed, as is shown in right figures.
Note that the alarm and measurement function
of the gates is only active within the display
range.
Use the following procedure to specify B-Gate
logic:
