User Manual

Table Of Contents
Acquire the Sign
al
Amplitude
2. Push Ref Level and turn Multipurpose a to
set the approx
imate maximum power level,
as shown by the baseline indicator at the top
of the frequency graticule.
Ref Level
(a)
-25.0 dBm
3. Push Vertica
l and turn M ultipu rpose a to
adjust the vertical position. You will move
the baseline indicator up or down. This is
useful if yo
u want to move signals onto the
visible display.
Turn Multipu rpo se b to adjust the vertical
scale.
Vertical
420 mdiv
20.0 dB/div
4. Push Vertical Units and turn Multipurp ose
a to dene the vertical units of measure for
the frequ
ency domain. Choices are: dBm,
dBW, dBmV, dBV, dBmA , and dBA.
This is useful if your application requires
adiffere
nt unit of measurement than that
being currently displayed.
Vertical
Units
dBm
5. Push Auto Level to direct the o scilloscope
to autom
atically 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 s ame signal. The difference between them is their RBW.
Lower (narrower) RBWs take longer to process,
but have ner frequency resolution and a lower
noise oor.
Higher (wider ) RBWs take less ti m e to process, but have less frequency resolution
and a higher noise oor.
86 MDO3000 Series Oscilloscopes User Manual