R&S FSPN, User Manual

Page: 128 / 555

Common Measurement Settings
R&S
®
FSPN
128 User Manual 1179.4363.02 ─ 01
Selects the DC source that tunes the DUT. Voltage or current change supplied by
the sweep source on each measurement point.
Remote command:
VCO characterization:
CONFigure:VCO:SWEep:SOURce
on page 381
Spot noise vs tune:
CONFigure:SNTune:SWEep:SOURce
on page 383
●
"Fix Source"
Selects the DC source that is considered in the
Current / Voltage result display.
Current or voltage supplied by the fix source remains on a fix value during the
measurement.
Remote command:
CONFigure:VCO:FIX:SOURce
on page 379
For the other features, refer to the following topics.
●
"Turning the DC output on and off" on page 124
●
"Turning the output on and off" on page 124
●
"Selecting the output type (Vsupply only)" on page 125
●
"Defining the output level" on page 125
Sweep settings
The sweep settings define the tuning properties. They control the output of the
selected DC source over the course of a measurement: which voltage or current is
applied for each measurement, the sweep range and the measurement time for each
measurement point.
You can define sweep settings for each DC source individually.
Defining the sweep range ........................................................................................... 128
Defining the settling time .............................................................................................129
Selecting the frequency resolution .............................................................................. 129
Defining the sweep range
The R&S FSPN characterizes a DUT by applying a series of (tuning) voltages or cur-
rents to the DUT. Each voltage or current is a measurement point. The number of mea-
surements performed during a VCO characterization therefore depends on the number
of measurement points.
You can define the first and last tuning value applied to the DUT with the "Start" and
"Stop" values. Within this sweep range, the voltages or currents applied to the DUT
depend on the number of "Meas Points". The measurement points not only define the
number of measurements, but also the distance between voltages or currents.
Example:
The start and stop values are 0 V and 5 V respectively. The number of measurement
points is 10.
This means that a measurement is performed on every 0.5
V of voltage:
0 V, 0.5 V, 1 V, 1.5 V, etc.
VCO Characterization Configuration