The Spectrum Application (RF Measurements)
R&S
®
FPL1000
100
User Manual 1178.3370.02 ─ 09
Table 7-1: Signal generator settings (e.g. R&S SMW)
Frequency
128 MHz
Level
-30 dBm
Measuring the Level and Frequency Using Markers
.............................................100
Measuring the Signal Frequency Using the Signal Counter
................................. 101
Measuring the Level and Frequency Using Markers
The level and frequency of a sinusoidal signal can be measured easily using the
marker function. The R&S
FPL1000 always displays its amplitude and frequency at the
marker position. The frequency measurement uncertainty is determined by the refer-
ence frequency of the R&S
FPL1000, the resolution of the marker frequency display
and the number of sweep points.
1. Select [PRESET] to reset the instrument.
2. Connect the signal to be measured to the "RF INPUT" connector on the
R&S
FPL1000.
3. Set the center frequency to
128
MHz
.
4. Reduce the frequency span to
1
MHz
.
Note:
Coupled settings. When the frequency span is defined, the resolution band-
width, the video bandwidth and the sweep time are automatically adjusted,
because these functions are defined as coupled functions in the presettings.
5. Select [MKR] to activate marker 1 and automatically set it to the maximum of the
trace.
The level and frequency values measured by the marker are displayed in the
marker information at the top of the display.
Note:
Performing a peak search. When a marker is initially activated, it automati-
cally performs the peak search function (as shown in the example).
If a marker was already active, select the [Peak Search] key or the "Peak" softkey
in the [MKR >] menu in order to set the currently active marker to the maximum of
the displayed signal.
Increasing the Frequency Resolution
The frequency resolution of the marker is determined by the resolution of the trace. A
trace consists of 1001 trace points, i.e. if the frequency span is 1
MHz, each trace point
represents a span of approximately 1
kHz. This corresponds to a maximum uncertainty
of +/-
0.5
kHz.
You can increase the resolution of the trace by reducing the frequency span.
Measurements and Results
