FFT Spectral Analysis
5
Keysight InfiniiVision 1200 X-Series and EDUX1052A/G Oscilloscopes User's Guide
59
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To make cursor measurements, press the
[Cursors]
key and set the
Source
softkey to
Math N
.
Use the X1 and X2 cursors to measure frequency values and difference between
two frequency values (
Δ
X). Use the Y1 and Y2 cursors to measure amplitude in
dB and difference in amplitude (
Δ
Y).
4
To make other measurements, press the
[Meas]
key and set the
Source
softkey to
Math N
.
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.
To adjust the FFT waveform scale and offset, use the multiplexed scale and
position knobs next to the
[Math]
key to re-size and re-position the math
waveform.
The following FFT spectrum was obtained by connecting a 2.5 V, 100 kHz square
wave to channel 2. Set the horizontal scale to 50 µs/div, vertical sensitivity to
1 V/div, Units/div to 20 dBV, Offset to -40.0 dBV, Center frequency to 500 kHz,
frequency Span to 1 MHz, and window to Hanning.
See Also
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