Evaluating Signal Quality - Sick Tdr Betriebsanleitung

LFP Cubic
Note:
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The value starts from the LFP process connection
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The value should cover all interference signals
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Maximum value = probe length – 100 mm
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AutCal function must be run after this (see Chapter 2 "Commissioning the LFP")
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The CalRng parameter should always correspond to the probe length for LFPs with remote amplifier
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5.6 Evaluating signal quality

Parameters describe the quality of the measuring signal.
Log into expert mode (see Chapter 5.1 "Expert mode")
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SigQa1
Characteristic for the robustness of the EXPRT-Config-TrsHld setting
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Not active in foam mode. The displayed value is only valid if the sensor displays the correct level
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value.
Value range: 0 to 100%
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Good signal: > 40% (a high pulse reserve is provided with the current TrsHld setting.)
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Measures: Reduce EXPRT-Config-TrsHld to increase SigQa1.
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Note:
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Changing TrsHld will have an impact on SigQa2 and SigQa3.
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If a satisfactory SigQa1 value cannot be achieved by adjusting TrsHld in conjunction with the
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SigQa values, the installation condition must be checked. Using a coaxial tube improves signal
detection, particularly in media with low DK values (e.g., oil).
SigQa2
Characteristic for the robustness of echo pulse detection in relation to interference pulses
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Not active in foam mode. The displayed value is only valid if the sensor displays the correct level
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value.
Value range: 0 to 100%
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Good signal: > 50%
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Measures: Run AutCal; check installation conditions; remove deposits from probe and process
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connection
SigQa3
Characteristic for signal noise and electromagnetic interference
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Value range: 0 to 100%
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Good signal: > 75%
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Poor signal: < 50%
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Not active in foam mode. The displayed value is only valid if the sensor displays the correct level
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value.
Value range: 0 to 100%
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Measures:
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Increase EXPRT-Config-TrsHld
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EXPRT-Config-MeasMd = HiAcc
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Improve filtering
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Switch on filter
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Reduce EXPRT-Config-MaxCol
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8014825/YE12/2014-09-15 © SICK AG • Level sensors • Germany • Subject to change without notice
5 Advanced functions
EN
Operating instructions
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