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MEASUREMENT
69
To change the unit/div settings, press
Unit/div, then use the Variable knob to
change the unit/div.
The units that are displayed depend
on which operator has been selected,
and whether the probe for the selected
channel has been set to voltage or
current.
Operator:
Unit/div:
Multiplication
Division
Addition/Subtraction
VV, AA or W
V/V, A/A
V or A
Turn Off Math
To turn off the Math result from the
display, press the Math key again.
MATH
M
FFT Overview & Window Functions
Background
The FFT function performs a Fast Fourier
Transform on one of the input signals or the
reference waveforms. The resultant spectrum will
be shown on the screen in real-time. Four types of
window function are available: Hanning,
Hamming, Rectangular, and Blackman, as
described below.
Hanning
Frequency resolution
Good
Amplitude resolution
Not good
Suitable for....
Frequency measurement on
periodic waveforms
Hamming
Frequency resolution
Good
Amplitude resolution
Not good
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