Siemens SITRANS LUT400, Руководство по эксплуатации

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Page 204 SITRANS LUT400 (HART) – OPERATING INSTRUCTIONS A5E33329501
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3.2.9. Echo Quality
3.2.9.1. Figure of Merit
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.)
3.2.9.2. Confidence
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.
In SIMATIC PDM, open the menu Device – Echo Profile Utilities and click
on the tab Echo Profile.
3.2.9.3. Echo Strength
Displays the absolute strength (in dB above 1 μ V rms) of the echo selected
as the measurement echo.
In SIMATIC PDM, open the menu Device – Echo Profile Utilities and click
on the tab Echo Profile.
3.2.9.4. Noise Average
Displays the average ambient noise (in dB above 1 μ V 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. Noise Peak
Displays the peak ambient noise (in dB above 1 μ V rms) of a noise profile
after each measurement.
Values (view only)
Range: 0 to 100 %
Values (view only)
Range: -20 to 128
Values (view only)
Range: -20 to 128 dB