Acquire the Signal
Amplitude
2.
Push
Ref Level
and rotate multipurpose
knob
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 rotate multipurpose knob
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.
Rotate multipurpose knob
b
to adjust the
vertical scale.
Vertical
420 mdiv
20.0 dB/div
4.
Push
Vertical Units
and rotate multipurpose
knob
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.
78
MDO4000 Series Oscilloscopes User Manual
Summary of Contents for MDO4054-3
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