GE FVP110 Maintenance Manual page 189

Signatures and Relevant
High Resolution
Actuator Signature *1
Step Response Test
Scan Time [seconds]
Deviation Margin [%]
Sampling Rate [milliseconds] (not used in this function)
Performing measurements sets the pressure data in
SIGN_DATA_X and the position data (%) in SIGN_DATA_Y.
The high-resolution actuator signature is the valve
input-to-position characteristics, measured with high resolution
while sampling data at the specified time rate. Up to 100 data
values can be stored in the FVP100 memory. After this limit is
reached during measurement, the stored data is overwritten
from the leading data in order. Using ValVueFF, you can con-
tinue measurement while uploading the measured data. The
following is settable for EXT_ACT_SIGN_SET:
Lower Setpoint [%] (point to start the measurement)
Upper Setpoint [%] (point to finish the measurement)
Recommended Scan Time [seconds] (not used in this function)
Scan Time [seconds]
Deviation Margin [%]
Sampling Rate [milliseconds]
The sampling rate can be set within the range of 200 through
1000 milliseconds. The total number of measured samples is
obtained by the following formula:
Scan time / sampling rate 1000 [points]
Performing measurements sets the pressure data in
SIGN_DATA_X and the position data (%) in SIGN_DATA_Y.
The step response test measures time-series changes in the
valve position in response to a sudden change (step) in the
positioner setpoint from the preset initial setpoint to the destina-
tion setpoint. The following is settable for STEP_RESP_SET:
Initial Setpoint [%]
Destination Setpoint [%]
Sampling Rate [milliseconds]
Number of Samples [points]
The sampling rate can be set within the range of 20 through
1000 milliseconds (corresponding to the measurement period
of 0.4 through 600 seconds). The number of samples can be
set to up to 600.
Performing measurements sets the positioner setpoints in
SIGN_DATA_X and the position data (%) in SIGN_DATA_Y.
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Diagnostics