Analyze Wavefor
morTraceData
Each automatic marker has a readout associated with it. These can be absolute or delta readouts. An absolute marker
readout shows t
he actual frequency and amplitude of the associated marker. A delta marker readout shows the frequency
and amplitude differences from the Reference Marker. The Reference Marker ’s readout indicates absolute frequency
and amplitude, regardless of the readout type.
Manual Marke
rs
Two manual markers a re provided for you to measure non-peak areas of the spectrum and to measure Noise Density and
Phase Noise. When the manual markers are turned on, the R eference Marker is no longer automatically attached to the
highest amplitude peak. It is now assigned to the Multipurpose a knob and can be m oved to any location you desire. This
enables easy measurement of any part of the spectrum as well as delta measurements to any part of the spectrum. This
also lets you measure non-peak spectral content of interest. The readouts for manual markers indicate frequency and
amplitude, just like automatic marker readouts.
As with automatic peak marker readouts, the manual marker readouts can show either absolute or delta values.
1. One manual marker is controlled by
Multipurpose a.
2. The other manual marker is controlled
by M ultipu rpo se b.
3. Delta readouts for frequency and
amplitude are shown at the top of the
display.
4. The third line of the manual marker
a always shows the noise density
(dBm/Hz).
5. The third line of manual marker b always
shows noise density when you choose
absolute markers. It shows phase
noise when you choose delta markers
(dBc/Hz).
MDO3000 Series Oscilloscopes User Manual 123
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