9440300990 26-3
DECS-250 Testing
Frequency Response
Frequency response testing functions are available by clicking the RTM Analysis screen Frequency
Response button. Frequency Response screen functions are illustrated in Figure 26-2 and described as
follows.
Test Mode
Frequency response testing may be performed in Manual or Auto mode. In Manual mode, a single
frequency can be specified to obtain the corresponding magnitude and phase responses. In Auto mode,
BESTCOMSPlus
®
will sweep the range of frequencies and obtain the corresponding magnitude and
phase responses.
Manual Test Mode Options
Manual test mode options include settings to select the frequency and magnitude of the applied test
signal. A time delay setting selects the time after which the magnitude and phase response
corresponding to the specified frequency is computed. This delay allows transients to settle before
computations are made.
Figure 26-2. Frequency Response Screen
Auto Test Mode Options
Automatic test mode options include settings to select the minimum frequency, maximum frequency, and
magnitude of the sinusoidal wave that is applied during a frequency response test.
Bode Plotting
A Bode plot can be printed, opened, and saved in graph (.gph) format.
Transfer Function
The point in the DECS-250 logic circuitry where a signal is injected for analysis of magnitude and phase
responses is selectable. Signal points include PSS Comp Frequency, PSS Electric Power, AVR
Summing, AVR PID Input, and Manual PID Input.
The type of input signal to be injected and output point are selectable, and include:
• AvrOut
• B Hz: Bus Frequency {Hz}
• CntOp: Control Output {pu}
• CompF: Compensated Frequency Deviation
• Droop
• ErrIn: AVR Error Signal
• FcrErr
• FcrOut
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