Agilent Technologies 54657A Uživatelská příručka stáhnout pdf (Strana 27)

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Cent Freq Allows centering of the FFT spectrum to the desired frequency.

Select and rotate the knob closest to the

Cursors key to set the

center frequency to the desired value.

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Freq Span Sets the overall width of the FFT spectrum (left graticule to

right graticule). Select and rotate the knob closest to the

Cursors

key to set the center frequency to the desired value. See FFT

Measurement Hints (next page) for information on using frequency

span to magnify the display.

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Move 0Hz To Left Pressing this key changes the center frequency so that

the left most graticule represents 0 Hz.

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Autoscale FFT The Autoscale FFT softkey will automatically set Units/div

and Ref Levl to bring the FFT data on screen. Frequency Span is set to

maximum.

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Window Allows one of four windows to be selected. Select and rotate the

knob closest to the

Cursors key to set the desired window. The

rectangular window is useful for transients signals and signals where

there are an integral number of cycles in the time record. The hanning

window is useful for frequency resolution and general purpose use. It

is good for resolving two frequencies that are close together or for

making frequency measurements. The flattop window is the best

window for making accurate amplitude measurements of frequency

peaks. The exponential window is the best window for transients

analysis.

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Previous Menu Returns you to the previous softkey menu.

FFT spectrum (F2) is available for viewing, measurement, or storage.

The Cursors key contains two additional selections that can be

used to measure or move the FFT spectrum. Press

Cursors ,

then set the

Source softkey to F2.

Find Peaks Pressing this key sets Vmarker1 and the start marker (f1) on the

peak with the highest amplitude and sets Vmarker2 and the stop marker (f2)

on the peak with the next highest amplitude. Marker values in dBV/dBm or

frequency (dependent on the active cursor)are automatically displayed at the

bottom of the oscilloscope screen. The difference in dBV/dBm (∆V) or

frequency (∆f) between the two peaks is also displayed.

Move f1 To Center Pressing this key changes the center graticule (or center

frequency) to the current f1 marker frequency. If f1 cannot be found, a

message is displayed on the screen.

Operating the Measurement/Storage Module

FFT Measurement

2–11

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