Technical Specifications

159
Step Response Test
Diagnostic Services
Figure 138 Result Analysis - Cyclical
Cyclical with Deadband
Figure 139 shows the data setup to produce the graph in Figure 140 and the tabular
results in Figure 141.
Figure 139 Step Response Setup - Cyclical with Deadband
In Figure 140 the Step Size is 0.2% and the Dead Band area is circled by pink color. In
this area, the Set Point decreased 0.2%, but the valve did not move. So the Dead Band
is 0.2% (one step size, Dead Band = number of steps that valve was not responding *
Step Size).