Flowserve Logix MD+ ValveSight - Manual (Page 173)

ValveSight™ Diagnostics DTM Manual for Logix MD+ Positioner with HART®
FCD- LGENSF0014-00
© Flowserve Corporation
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an analog (4-20 mA) command source.
Hysteresis And Deadband
The Average and Maximum values from the test for the combined hysteresis and deadband
are shown. The positioner has no method to separate the hysteresis from the deadband.
This measures how close the position feedback value gets to the same position when
approaching the same position from different directions.
Repeatability
The Average and Maximum values from the test for the repeatability of the system are
shown. Repeatability measures how close the position feedback comes to the same
position when approached from the same direction each time.
+/- Linearity Error
The
+/- Linearity Error value shows how closely the system follows a straight line, best fit to
the response.
Monitors
Start Time is the time the test started.
Elapsed Time is the time in seconds that have passed since the test started.
HDRL Test Progress shows the completion status.