Ronde & Schwarz 1304.0004.03, User Manual

Page: 301 / 1076

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
301 User Manual 1178.3370.02 ─ 09
In this case, you can first connect an external noise source (whose noise power level is
known in advance) to the R&S
FPL1000 and measure the total noise power. From this
value you can determine the noise power of the R&S FPL1000. Then when you mea-
sure the power level of the actual DUT, you can deduct the known noise level from the
total power to obtain the power level of the DUT.
Remote command:
DIAGnostic:SERVice:NSOurce
on page 808
7.4 Frequency and Span Configuration
The frequency and span settings define the scope of the signal and spectrum to be
analyzed with the R&S
FPL1000.
● Impact of the Frequency and Span Settings .........................................................301
● Frequency and Span Settings ...............................................................................302
● Keeping the Center Frequency Stable - Signal Tracking ...................................... 306
● How To Define the Frequency Range ................................................................... 307
● How to Move the Center Frequency through the Frequency Range .................... 307
7.4.1 Impact of the Frequency and Span Settings
Some background knowledge on the impact of the described settings is provided here
for a better understanding of the required configuration.
● Defining the Scope of the Measurement - Frequency Range ...............................301
● Stepping Through the Frequency Range - Center Frequency Stepsize ............... 301
7.4.1.1 Defining the Scope of the Measurement - Frequency Range
The frequency range defines the scope of the signal and spectrum to be analyzed. It
can either be defined as a span around a center frequency, or as a range from a start
to a stop frequency. Furthermore, the full span comprising the entire possible fre-
quency range can be selected, or a zero span. The full span option allows you to per-
form an overview measurement over the entire span. Using the "Last Span" function
you can easily switch back to the detailed measurement of a specific frequency range.
For sinusoidal signals, the center frequency can be defined automatically by the
R&S
FPL1000 as the highest frequency level in the frequency span (see "Adjusting the
Center Frequency Automatically (Auto Frequency)" on page 344).
7.4.1.2 Stepping Through the Frequency Range - Center Frequency Stepsize
Using the arrow keys you can move the center frequency in discrete steps through the
available frequency range. The step size by which the center frequency is increased or
decreased is defined by the "Center Frequency Stepsize".
Frequency and Span Configuration