Siemens SITRANS LUT400 Operating Instructions Manual page 212

3.2.9. Echo Quality
3.2.9.1.
This value measures the quality of the reported echo value: higher values
represent better quality. This measure combines the noise level, quality of
tracking, and signal strength. (For more details see Echo Processing on
page 257.)
Values (view only)
3.2.9.2.
Indicates echo reliability: higher values represent better echo quality. The
display shows the echo confidence of the last measurement. Echo
Threshold (2.12.2.2.) defines the minimum criterion for echo confidence.
Values (view only)
In SIMATIC PDM, open the menu Device – Echo Profile Utilities and click
on the tab Echo Profile.
3.2.9.3.
Displays the absolute strength (in dB above 1 μV rms) of the echo selected
as the measurement echo.
Values (view only)
In SIMATIC PDM, open the menu Device – Echo Profile Utilities and click
on the tab Echo Profile.
3.2.9.4.
Displays the average ambient noise (in dB above 1 μV rms) of a noise profile
after each measurement.
The noise level is a combination of transient acoustic noise and electrical
noise (induced into the transducer cable or receiving circuitry). See Noise
Problems on page 242.
3.2.9.5.
Displays the peak ambient noise (in dB above 1 μV rms) of a noise profile
after each measurement.
Page 204 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS
Figure of Merit
Range: 0 to 100 %
Confidence
Range: -20 to 128
Echo Strength
Range: -20 to 128 dB
Noise Average
Noise Peak
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