Yokogawa YVP20S - Manual (Page 136)

14-10
<Toc> <Ind> <14. DIAGNOSTIC SERVICES>
IM 21B04C50-01E
• Data to Obtain
In measuring the extended actuator signature, YVP will obtain 100 data set. (Position data
and Pressure data is one set.)
There are two data acquisition mode. Position related data acquisition and time sam-
pling related data acquisition. Normally, data will be acquired according to the addressed
measuring position point. When the valve is saturated and can not reach the measurement
point, then data acquisition mode is switched to time sampling.
Figure14.11 Extended Signature Graph
• Offset measurement
Before measuring the extended actuator signature, YVP will perform Offset measurement
(The same procedure in Auto Tuning.) in order to prepare for the measurement if selected
measuring mode is not Measure All.
• Measurement of Spring Range and Valve Friction
You can view the results of spring range and valve friction as in the same way at the
Standard Actuator Signature.
14.3.3 High Resolution Actuator Signature
This function is used for measuring actuator signature in high resolution. This function will
measure the In-Out characteristic of the control valve in time sampling mode. The number
of measuring sample is dependent on the time of round-trip, and can be obtained by the
following Calculation: Scan Time/Sampling rate
×1000 [point].
Before measuring the signature, YVP110 will perform Offset measurement (The same
procedure in Auto Tuning) in order to prepare for the measurement.
For details, refer to ‘14.3.2 Extended Actuator Signature’.