Fluke 199C/S FE 192,196,199 C Users Manual - Page 29

Using Mathematics Function Spectrum, FFT, C Versions, Waveform, Mathematics, A vs B, Waveform Options

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3 Jump to Waveform: and Select Mathematics... to open the Mathematics menu. 4 Select Function: A+B, A-B, AxB or A vs B. 5 Select a scale factor to fit the mathematical result waveform onto the display, and return. The sensitivity range of the mathematical result is equal to the sensitivity range of the least sensitive input divided by the scale factor. 1 Using The Scope Acquiring Waveforms Using Mathematics Function Spectrum (FFT, C Versions) The Spectrum function shows the spectral content of the input A or input B waveform. It performs an FFT to transform the amplitude waveform from the time domain into the frequency domain. To reduce the effect of side-lobes (leakage) it is recommended to use auto windowing. It will automatically adapt the part of the waveform that is analyzed to a complete number of cycles Selecting Hanning, Hamming or no windowing results in a faster update, but also in more leakage. Ensure that the entire waveform amplitude remains on the screen. To use the Spectrum function, do the following: 1 Display the SCOPE key labels. 2 Open the Waveform Options menu. 21

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Using The Scope
Acquiring Waveforms
1
21
3
Jump to
Waveform:
and Select
Mathematics...
to open the
Mathematics
menu.
4
Select Function:
A+B
,
A-B
,
AxB
or
A vs B
.
5
Select a scale factor to fit the
mathematical result waveform onto
the display, and return.
The sensitivity range of the mathematical result is equal to
the sensitivity range of the least sensitive input divided by
the scale factor.
Using Mathematics Function Spectrum
(FFT, C Versions)
The Spectrum function shows the spectral content of the
input A or input B waveform.
It performs an FFT to
transform the amplitude waveform from the time domain
into the frequency domain.
To reduce the effect of side-lobes (leakage) it is
recommended to use auto windowing.
It will automatically
adapt
the part of the waveform that is analyzed to a
complete number of cycles
Selecting Hanning, Hamming or no windowing results in a
faster update, but also in more leakage.
Ensure that the entire waveform amplitude remains on the
screen.
To use the Spectrum function, do the following:
1
Display the
SCOPE
key labels.
2
Open the
Waveform Options
menu.