User Manual

Analyzing a wave
form
The oscilloscope shows the default FFT
screen. The lower main screen shows the
FFT waveform.
Use the Vertical Position knob of the
source channel to move the FFT waveform
up or down.
3. Push Source
wfm side-menu button to toggle the display of the source waveform (at the top of the screen) On or Off.
4. Push the Source side-menu button and use Multipurpose knob to set the source to channel 1, 2, 3,or4. The default
source is w
hatever channel was selected before opening the FFT window.
5. Push the Vertical Units side-menu button
and use the Multipur po se knob to select
and click
dBV RMS or Lin ear RMS.
Use the default dBV RMS Vertical Units
scale to see a detailed view of multiple
frequen
cies, even if the frequencies have
very different amplitudes.
Use the
Linear RMS vertical scale to see
an overall view of how all frequencies levels
compare to each other.
6. Push
the Window side-menu button and use the Multipurpose knob to select and click Hanning, Rectangular, Hamming,
or Blackman-Harris. (See page 62, A bout FFT windows.)
7. Push
the Ho rizo ntal Center Position
side-menu button and use the
Multipurpose knob to position the
FFT
graph horizontally. The readout on the
side menu is the frequency of the waveform
point that is positioned on the center vertical
gra
ticule. Use this to quickly measure FFT
‘spike’ frequencies.
60 TBS2000 Series User Manual