HP 54540 Series - Page 189

Math/FFT Menu
Displaying Functions
8 Press the Vertical 1 key. Then, turn off channel 1.
9 Press the Math/FFT key. Then, select function fl, set the display to
on, select channel 1, and set the operator to FFT.
10 Press the more FFT controls softkey. Set the # of points to
1024. Then, set the window to rectangular.
11 Press the more softkey.
You can use the oscilloscope to make automatic peak measurements in the
Math/FFT menu.
12 Using the peak search softkey and the entry devices, set marker 1
and marker 2 to the first peak.
When FFT is the selected operator, the time base settings beneath the
waveform viewing area change from time values to frequency values, like Hz
or kHz. Also, when the peak search softkey is pressed, the marker source
is slaved to the FFT function. This feature saves you time because you do
not have to access the marker menu to set the markers to the FFT function.
Because both markers are on the same peak, they have the same marker
reading.
Figure
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10-22