Basic Operation
Vertical Zoom and Position
When the FFT spectrum is being displayed, the channel vertical knobs become the zoom and
position controls corresponding to their respective channels. The VOLTS/DIV knob provides the
following zoom factors: X1(default), X2, X5 and X10. The FFT spectrum is magnified vertically to
the marker M (math waveform reference point on the left edge of the screen). Turn the
VERTICAL POSITION knob clockwise to move up the spectrum.
5.3.1.7
Using Cursors to Measure FFT Spectrum
You may use cursors to take two measurements on the FFT spectrum: amplitude (in dB) and
frequency (in Hz). Amplitude is referenced to 0db that equals 1VRMS here. You may use cursors
to measure at any zoom factor.
Push the CURSOR button, choose the Source option and then select Math. Press the Type
option button to select between Amplitude and Frequency. Click the SELECT CURSOR option to
choose a cursor. Then use the V0 knobs to move Cursor S and Cursor E. Use the horizontal
cursor to measure the amplitude and the vertical cursor to measure the frequency. Now the
display at the DELTA menu is just the measured value, and the values at Cursor S and Cursor E.
Delta is the absolute value of Cursor S minus Cursor E.
5.4 Trigger Controls
The trigger can be defined through the Trigger Menu and front-panel controls. There are six types
of trigger: Edge, Video, Pulse Width, Swap, Slope and Overtime. Refer to the following tables to
find a different set of options for each type of trigger.
DSO5000 Series Digital Storage Oscilloscope User Manual 29
Frequency Cursors
Amplitude Cursors
