Math Waveforms 4
Agilent InfiniiVision 2000 X-Series Oscilloscopes User's Guide 71
3 To make cursor measurements, press the [Cursors] key and set the
Source softkey to Math: f(t).
Use the X1 and X2 cursors to measure frequency values and difference
between two frequency values (ΔX). Use the Y1 and Y2 cursors to
measure amplitude in dB and difference in amplitude (ΔY).
4 To make other measurements, press the [Meas] key and set the Source
softkey to Math: f(t).
You can make peak-to- peak, maximum, minimum, and average dB
measurements on the FFT waveform. You can also find the frequency
value at the first occurrence of the waveform maximum by using the X
at Max Y measurement.
The following FFT spectrum was obtained by connecting a 4 V, 75 kHz
square wave to channel 1. Set the horizontal scale to 50 µs/div, vertical
sensitivity to 1 V/div, Units/div to 20 dBV, Offset to - 60.0 dBV, Center
frequency to 250 kHz, frequency Span to 500 kHz, and window to
Hanning.
See Also • "To perform a transform function on an arithmetic operation" on
page 64
• "FFT Measurement Hints" on page 72
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