Datasheet

10 R&S®HMO1002
Frequency Analysis
Due to the outstanding FFT functionality of the R&S®HMO series oscilloscopes signals can also be analysed in
the frequency domain with up to 128 Kpoints. Additional practical tools such as cursor measurement as well
as peak-detect-functions are also available. They allow engineers to complete their analysis signicantly
faster, also in the frequency domain.
Easy analysis in frequency domain
Quite often the distortion of input signals cannot be
detected with the naked eye. For instance, the sine
wave signal displayed in gure 1 appears to be
undistorted. Only the frequency spectrum (gure 2)
- available with just one touch of a button - clearly
displays additional harmonics that occur as
harmonic oscillations for multiples of the basic
frequency.
For non-periodic input signals most instruments
offer the option to trigger the spectrum at just the
right moment to then check it in “STOP” mode
at a later time. However, at that point, many
oscilloscopes with FFT functionality calculate the
spectrum only once and store the result in the
memory. The base time signal will no longer be used
for the calculation. Consequently, an investigation
of all parts of the signal will no longer be possible.
R&S®HMO series oscilloscopes work differently:
Since FFT is also active for previously stored
signals, it is possible to subsequently analyze any
sections of those signals captured in single shot
mode or stop mode with an adjustable window
width. Figure 3 shows a sine burst signal in the
time domain.
Pushing the FFT button will switch the oscilloscope
into the frequency domain. Users can choose
Figure 1: A sinusoid signal that appears undistorted at rst sight Figure 2: The frequency spectrum exposes the signal distortion Figure 3: Sine burst signal in time domain