9440300990 26-7
DECS-250 Testing
Figure 26-4. Step Response Analysis - AVR Tab
Var and PF Tabs
The var and PF tabs are similar in their controls that enable the application of step changes to their
respective setpoints. PF tab controls are illustrated in Figure 26-5. Var and PF tab controls operate as
follows.
Figure 26-5. Step Response Analysis - PF Tab
Step changes that increase or decrease the setpoint can be applied by clicking the increment (up arrow)
or decrement (down arrow) button. Step-change setpoints can be entered in two setting fields. Clicking
the right-arrow button beside one of the two fields initiates a step change to the corresponding setpoint
value. A button is provided to return the setpoint to its original value before any step changes were
invoked. This original value is the setpoint established in the Setpoints section of the BESTCOMSPlus
®
settings explorer and is displayed in the read-only field adjacent to the button.
Analysis Options
Options are provided to arrange the layout of plots and adjust graph display.
Layout Tab
Up to six data plots may be displayed in three different layouts on the RTM screen. Place a check in the
Cursors Enabled box to enable cursors used for measuring between two horizontal points. See Figure
26-6.
Graph Display Tab
Options are provided to adjust graph history and poll rate. Graph height sets the displayed graphs to a
fixed height in pixels. When the Auto Size box is checked, all displayed graphs are automatically sized to
equally fit the available space. History length is selectable from 1 to 30 minutes. Poll rate is adjustable
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