Trying Out the Instrument
R&S
®
FSWP
59
Getting Started 1177.5756.02 ─ 13
3. Configure the signal source output as described in
4. Start the measurement ([RUN SGL] or [RUN CONT]).
The application measures the additive noise on the output frequency of the
signal source in the default measurement (or frequency offset) range.
5. You can stop the measurement (to analyze the measurement data in detail)
with the [RUN SGL] or [RUN CONT] key; [RUN SGL] performs one more
measurement, then stops, [RUN CONT] stops immediately.
By default, two traces are displayed: the first trace shows the smoothed data
without spurs, the second trace the raw data including spurs.
5.2.4
The Baseband Noise Measurement
Baseband Noise measurements measure the noise characteristics of a DUT over
an absolute frequency span (not relative to carrier).
You can use either the RF input for these measurements, or the baseband inputs.
The baseband inputs are DC coupled and extend the lower frequency range to
1
mHz (the lowest supported frequency on the RF input is 1
MHz). Using the
baseband input, you can, for example, test the voltage supply of DC sources.
Test setup
DUT
R&S FSWP
RF / BB*
V
aux
V
tune
V
supply
required connections
optional connections
* = See text below for instructions on how to use the baseband input.
How to measure baseband noise at the RF input
For baseband noise measurements on the RF input, proceed as follows.
1. Connect the DUT to the RF input.
2. Perform a [PRESET].
Measurements
