Siemens SITRANS LUT400 Operating Instructions Manual page 323

derating
to decrease a rating suitable for normal conditions according to guidelines specified for
different conditions.
echo
a signal that has been reflected with sufficient magnitude and delay to be perceived in some
manner as a signal distinct from that directly transmitted. Echoes are frequently measured in
decibels relative to the directly transmitted signal.
echo confidence
the recognition of the validity of the echo. A measure of echo reliability.
echo lock window
a window centered on an echo in order to locate and display the echo's position and true
reading. Echoes outside the window are not immediately processed.
Echo marker
a marker that points to the processed echo.
Echo processing
the process by which the device 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
false echo
any echo which is not the echo from the desired target. Generally, false echoes are created
by vessel obstructions.
far range
the distance below the zero percent or empty point in a vessel.
figure of merit
combines noise level, tracking quality, and signal strength to measure the quality of the
reported echo value.
SITRANS LUT400
Operating Instructions, 07/2019, A5E33329501-AC
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