Basic Measurement Examples
R&S
®
ESR
81
Getting Started 1316.3749.02 ─ 09
M1[1]
-30.00 dBm
128.00000 MHz
The field header indicates the number of the marker (Marker 1) and the trace
on which the marker is located ([1] = Trace 1).
Note:
Performing a peak search. When a marker is initially activated, it auto-
matically performs the peak search function (as shown in the example).
If a marker was already active, you have to press the [Peak Search] key on
the front panel or the "Peak" softkey in the [MKR >] menu in order to set the
currently active marker to the maximum of the displayed signal.
7.1.1.1
Increasing the Frequency Resolution
The frequency resolution of the marker is predefined by the pixel resolution of the
trace. A trace uses 691 pixels, i.e. if the frequency span is 1 MHz, each pixel cor-
responds to a span of approx. 1.4 kHz. This corresponds to a maximum uncer-
tainty of +/- 0.7 kHz.
You can increase the pixel resolution of the trace by reducing the frequency span.
Reducing the frequency span to 10 kHz
1. Press the [SPAN] key.
2. 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. 14 Hz (10 kHz span / 691 pixels) , i.e. the precision of
the marker frequency display increases to approx.
±
7 Hz.
7.1.1.2
Setting the Reference Level
With signal analyzers, the reference level is the level at the upper limit of the dia-
gram. To achieve the widest dynamic range possible for a spectrum measure-
ment, use the entire level span of the signal 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.
Measuring a Sinusoidal Signal
