VEGA VEGAPULS 45 VBUS - Manual (Page 54)

54 VEGAPULS 42, 44 and 45 – VBUS
Adjustment with the PC on the signal conditioning instrument
Furthermore, you can manually enter in the
menu item "
Pulse velocity" a correction factor
for the pulse velocity of the radar signal
which travels at light velocity.
• Quit this menu if you do not want to make
adjustment with "
Cancel".
• With "
OK" you save the settings made.
• Click in the menu window " Meas. environ-
ment" to "
Quit".
You are again in the menu window " Sensor
optimisation".
Echo curve
With the menu item " Echo curve" in the menu
window "Sensor optimisation" you can see the
course and the strength of the detected
radar echo. If, due to vessel installations, you
expect strong false echoes, a correction (if
possible) of the mounting location and orien-
tation (during simultaneous monitoring of the
echo curve) can help localise the false ech-
oes and reduce their intensity. In the illustra-
tion, you can see the echo curve (before
correction of the sensor orientation) with a
false echo nearly as large as the product
echo.
In the next illustration you can see the echo
curve after optimum directing of the sensor to
the product surface (sensor axis perpen-
dicular to the product surface). The false
echo, caused e.g. by a strut, is now reduced
by more than 10 dB and will no longer influ-
ence the measurement.
You see that the false echo is approx. 20 dB
less than the useful echo (due to the strut)
and therefore can no longer influence the
measurement.
• Quit the menu window " Echo curve" with
"Quit".