Acquire the Signal
Amplitude
2.
Push
Ref Level
and turn
Multipurpose a
to
set the approximate maximum power level,
as shown by the baseline indicator at the top
of the frequency graticule.
Ref Level
(a)
-25.0 dBm
3.
Push
Vertical
and turn
Multipurpose a
to
adjust the vertical position. You will move
the baseline indicator up or down. This is
useful if you want to move signals onto the
visible display.
Turn
Multipurpose b
to adjust the vertical
scale.
Vertical
420 mdiv
20.0 dB/div
4.
Push
Vertical Units
and turn
Multipurpose
a
to de
fi
ne the vertical units of measure for
the frequency domain. Choices are: dBm,
dB
μ
W, dBmV, dB
μ
V, dBmA, and dB
μ
A.
This is useful if your application requires
a different unit of measurement than that
being currently displayed.
Vertical
Units
dBm
5.
Push
Auto Level
to direct the oscilloscope
to automatically calculate and set the
reference level for you.
Auto Level
Resolution Bandwidth
The resolution bandwidth (RBW) determines the level to which the oscilloscope can resolve individual frequencies in
the frequency domain. For example, if the test signal contains two carriers separated by 1 kHz, you will not be able to
discriminate between them unless the RBW is less than 1 kHz.
The views below both show the same signal. The difference between them is their RBW.
Lower (narrower) RBWs take longer to process,
but have
fi
ner frequency resolution and a lower
noise
fl
oor.
Higher (wider) RBWs take less time to process, but have less frequency resolution
and a higher noise
fl
oor.
86
MDO3000 Series Oscilloscopes User Manual
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