Siemens SITRANS L, Руководство по эксплуатации, Страница: 263 / 269

Glossary
SITRANS LR250 with FOUNDATION FIELDBUS
Operating Instructions, 09/2021, A5E32221411-AH
263
Echo Marker
a marker that points to the processed echo.
Echo Processing
the process by which the radar unit determines echoes.
Echo Profile
a graphical display of a processed echo.
Echo Strength
describes the strength of the selected echo in dB referred to 1 μV rms.
false echo
any echo which is not the echo from the desired target. Generally, false echoes are created
by vessel obstructions.
frequency
the number of periods occurring per unit time. Frequency may be stated in cycles per second.
hertz (Hz):
unit of frequency, one cycle per second. 1 Gigahertz (GHz) is equal to 10
9
Hz.
horn antenna
a conical, horn-shaped antenna which focuses microwave signals. The larger the horn
diameter, the more focused the radar beam.
inductance
the property of an electric circuit by virtue of which a varying current induces an
electromotive force in that circuit or in a neighboring circuit. The unit is a Henry.
multiple echoes
secondary echoes that appear as double, triple, or quadruple echoes in the distance from the
target echo.
Near Blanking
see Blanking.