YUSHI INSTRUMENTS
12
3.3.2
Pulse width
Through adjusting the value, the sensitivity and resolution of the echo can be changed. This
function aims at matching different probes and getting the highest sensitivity.
On the squared ultrasonic wave menu, press (up) or (down) to select the Pulse-W
submenu, then press (left decrease) or (right increase) to adjust the values. The maximum
value is 1000ns, and the minimum value is 25ns.
The pulse width and pulse frequency can be changed in turn by pressing (left decrease) or
(right increase).The pulse frequency can be adjusted between 0.5MHz to 20MHz. The pulse
frequency should be as similar as that of the probe center.
3.3.3
Damping
To adjust the damping of the oscillating circuit, and thereby to change the width, height and
resolution of the echo display, the damping can be adjusted.
On the squared ultrasonic wave menu, press (up) or (down) to select the damping
submenu, then press (left decrease) or (right increase) to adjust the values. There are 4
levels for option. The maximum value is 500
Ω
, and the minimum value is 33
Ω
.
With higher damping value, the echo is wider and higher. With lower damping value, the echo is
narrower and lower, but usually with higher resolution.
3.3.4
Broadband
The broadband function is to adjust the frequency of the ultrasonic wave when testing.
On the squared ultrasonic wave menu, press (up) or (down) to select the broadband
submenu, then press (left decrease) or (right increase) to turn the values: 0.4-15MHz or
1.0-4.0MHz.
3.3.5
Repeating frequency
The repeating frequency function is to set the detective times within the original pulse.
On the squared ultrasonic wave menu, press (up) or (down) to select the Prf-Mod
