Fluke 190 Series II User Manual page 37

3 Jump to Waveform: and select
Mathematics... to open the
ENTER
Mathematics menu.
4 Select Function: Spectrum.
ENTER
5 Select the source waveform for the
spectrum: Source : A, B, C or D
ENTER
6 Select Window: Auto (automatic
windowing), Hanning, Hamming,
ENTER
or None (no windowing).
You will see a screen that looks like Figure 11.
Observe that the top right of the screen displays
SPECTRUM.
If it displays LOW AMPL a spectrum measurement cannot
be done as the waveform amplitude is too low.
Using the Scope and Meter
If it displays WRONG TB the time base setting does not
enable the test tool to display an FFT result. It is either too
slow, which can result in aliasing, or too fast, which results
in less than one signal period on the screen.
7 Perform a spectrum analysis on
F1
trace A, B, C or D.
8 Set the horizontal amplitude scale
F2
to linear or logarithmic.
9 Set the vertical amplitude scale to
F3
linear or logarithmic.
10 Turn the spectrum function off/on
F4
(toggle function).
1
Acquiring Waveforms
29