Ronde & Schwarz 1304.0004K03, User Manual

Page: 306 / 1071

The Spectrum Application (RF Measurements)
R&S
®
FPL1000
306 User Manual 1178.3370.02 ─ 11
f
max
and span
min
are specified in the data sheet.
For more information see Chapter 6.4.1.1, "Defining the Scope of the Measurement -
Frequency Range" , on page 303.
Remote command:
[SENSe:]FREQuency:SPAN
on page 752
Start / Stop
Defines the start and stop frequencies.
The following range of values is allowed:
f
min
≤ f
start
≤ f
max
– span
min
f
min
+ span
min
≤ f
stop
≤ f
max
f
min
, f
max
and span
min
are specified in the data sheet.
Remote command:
[SENSe:]FREQuency:STARt
on page 753
[SENSe:]FREQuency:STOP
on page 753
Frequency Axis Scaling
Switches between linear and logarithmic scaling for the frequency axis.
Logarithmic scaling is only available if R&S FPL1-K54 is installed and only for f
stop
≥
1.4* f
start
.
Logarithmic scaling is not available together with CISPR trace detectors. If you select
logarithmic scaling while a CISPR trace detector is active, the trace detector is auto-
matically switched to auto detector (see also
"Restrictions for the R&S FPL1000 using
CISPR detectors" on page 254). The sweep mode is automatically switched to FFT
mode.
By default, the frequency axis has linear scaling. Logarithmic scaling of the frequency
axis, however, is common for measurements over large frequency ranges as it enhan-
ces the resolution of the lower frequencies. On the other hand, high frequencies get
more crowded and become harder to distinguish.
Remote command:
DISPlay[:WINDow<n>][:SUBWindow<w>]:TRACe<t>:X:SPACing
on page 749
Full Span
Sets the span to the full frequency range of the R&S FPL1000 specified in the data
sheet. This setting is useful for overview measurements.
Remote command:
[SENSe:]FREQuency:SPAN:FULL
on page 753
Zero Span
Sets the span to 0 Hz (zero span). The x-axis becomes the time axis with the grid lines
corresponding to 1/10 of the current sweep time ("SWT").
For details see Chapter 6.2.1, "Basic Measurements" , on page 97.
Remote command:
FREQ:SPAN 0Hz
, see
[SENSe:]FREQuency:SPAN
on page 752
Frequency and Span Configuration