Agilent Technologies 6000 Series manual Window, Offset

5 Making Measurements

•Center — sets the FFT spectrum frequency represented at the center vertical grid line of the display. It is possible to set the Center to values below half the span or above the maximum available frequency, in which case the displayed spectrum will not take up the whole screen. Press the Center softkey, then turn the Entry knob to set the desired center frequency of the display.

•Preset — sets the frequency Span and Center to values that will cause the entire available spectrum to be displayed. The maximum available frequency is half the effective FFT sample rate, which is a function of the time per division setting. The current FFT sample rate is displayed above the softkeys.

2Press the More FFT softkey to display additional FFT settings.

Window	FFT	Scale	FFT	Offset	Return	to
					previous menu

•Window — selects a window to apply to your FFT input signal:

•Hanning — window for making accurate frequency measurements or for resolving two frequencies that are close together.

•Flat Top — window for making accurate amplitude measurements of frequency peaks.

•Rectangular — good frequency resolution and amplitude accuracy, but use only where there will be no leakage effects. Use on self-windowing waveforms such as pseudo-random noise, impulses, sine bursts, and decaying sinusoids.

226 6000 Series Oscilloscope User’s Guide