FFT
Measuring an F
FT Spectrum Using C ursors
You can take two measurements on FFT spectr ums: magnitude (in dB), and
frequency (in Hz). Magnitude is referenced to 0 dB, where 0 dB equals 1 V
RMS
.
You can use the cursors to take measurements at any zoom factor. To do so,
follow these steps:
1. Push the Cursor button to see the cursor side menu.
2. Push Source ► FFT.
3. Push the Type option button and use the Multipurpose knob to select
Magnitude or Frequency.
4. Select Cursor 1 or Cursor 2.
5. Use the Multipurpose knob to move the selected cursor.
Use hori
zontal cursors to measure magnitude and vertical cursors to measure
frequency. The options display the delta between the two cursors, the value at
cursor 1 position, and the value at cursor 2 position. Delta is the absolute value of
cursor 1 minus cursor 2.
Magnitude cursors Frequency cursors
You can also take a frequency measurement without using the cursors. To do so,
tur
ntheHorizontal Position knob to position a frequency component on the
center graticule line and read the frequency at the top right of the display.
58 TBS1000B and TBS1000B-EDU Series Oscilloscopes User Manual
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