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R&S FSL
Note:
When the frequency span is defined, the resolution bandwidth, the video
bandwidth and the sweep time are automatically reset, because these functions
are defined as coupled functions in the preset setting.
5. Measure the level and frequency using the marker and read the results from the screen.
– Press the MKR key.
The marker is activated and automatically set on the maximum of the trace.
Note:
When a marker is initially activated, it automatically performs the peak search
function (as shown in the example).
If a marker was already active, you have to press the Peak softkey in the
marker–> menu in order to set the currently active marker to the maximum of
the displayed signal.
The level and frequency values measured by the marker are displayed in the marker
field at the top edge of the screen. They can be taken as the measurement result.
M1[1]
128.000000000 MHz
The field header indicates the number of the marker (Marker 1) and the trace on which
the marker is located ([1] = Trace 1).
Increasing the Frequency Resolution
The frequency resolution of the marker is predefined by the pixel resolution of the trace. A
trace uses 501 pixels, i.e. when the frequency span is 1 MHz, each pixel corresponds to a
span of approx. 2 kHz. This corresponds to a maximum uncertainty of +/– 1 kHz.
You can increase the pixel resolution of the trace by reducing the frequency span.
Reduce the frequency span to 10 kHz.
– Press the SPAN key.
– Using the numeric keypad, enter 10 in the dialog box and confirm the entry with the
kHz key.
The generator signal is measured using a span of 10 kHz. The pixel resolution of the
trace is now approx. 20 Hz (10 kHz span / 501 pixels) , i.e. the precision of the
marker frequency display increases to approx. ±10 Hz.
Setting the Reference Level
With spectrum analyzers, the reference level is the level at the upper limit of the diagram. To
achieve the widest dynamic range possible for a spectrum measurement, use the entire
level span of the spectrum analyzer. In other words, the highest level that occurs in the
signal should be located at the top edge of the diagram (=reference level) or immediately
below it.
1300.2519.62
–30.00 dBm
Measuring a Sinusoidal Signal
5.3
E-10
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