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Frequency Step (stepped sine)
The frequency step waveform produces a sine wave which changes frequency over time in discrete steps. The start and stop frequencies determine the limits of the signal. The start frequency can be less than the stop frequency in which case the frequency will decrease over time.
The step size can be either Linear or Octave (logarithmic).
Linear Steps - specify the step size in Hz. This works best when narrowband scaling is used on the analzyer.
Octave Steps - specify the fractional octave steps size to use. This works best when the octave scaling is used on the analyzer.
Jump Back to Start Frequency - when the stop frequency is reached the signal will immediately start again at the start frequency
Sweep Back to Start Frequency - when the stop frequency is reached the signal will step back to the start frequency.
Stop After a Single Pass - the signal generator will stop after the sequence completes; otherwise it will repeat continuously until the generator is stopped.
Dwell Time - specifies how long the signal stays at each step in the sequence. This value is specified in milliseconds.
Stepped sine waveforms are useful for frequency response testing. Set the averaging block size to 1 and use the Peak Hold option to capture the peak amplitude as the signal is stepped across the frequency span.
See Also: Freq Sweep, Signal Generator