Rohde & Schwarz FSW13, Руководство пользователя

Страница: 346 / 1150

Common Measurement Settings
R&S
®
FSW
346 User Manual 1173.9411.02 ─ 19
Source Frequency Coupling
Defines the frequency coupling mode between the R&S FSW and the generator.
For more information on coupling frequencies see "Coupling the Frequencies"
on page 338.
"Auto" Default setting: a series of frequencies is defined (one for each
sweep point), based on the current frequency at the RF input of the
R&S
FSW (see "(Automatic) Source Frequency (Numerator/Denomi-
nator/Offset)" on page 346); the RF frequency range covers the cur-
rently defined span of the R&S FSW (unless limited by the range of
the signal generator)
"Manual" The generator uses a single fixed frequency, defined by (Manual)
Source Frequency which is displayed when you select "Manual" cou-
pling.
Remote command:
SOURce:
​
EXTernal:
​
FREQuency:
​
COUPling[:
​
STATe]
​
on page 884
(Manual) Source Frequency
Defines the fixed frequency to be used by the generator.
Remote command:
SOURce:
​
EXTernal:
​
FREQuency
​
on page 884
(Automatic) Source Frequency (Numerator/Denominator/Offset)
With automatic frequency coupling, a series of frequencies is defined (one for each
sweep point), based on the current frequency at the RF input of the R&S
FSW.
However, the frequency used by the generator may differ from the input from the
R&S
FSW. The RF frequency may be multiplied by a specified factor, or a frequency
offset can be added, or both.
Note: The input for the generator frequency is not validated, i.e. you can enter any val-
ues. However, if the allowed frequency ranges of the generator are exceeded, an error
message is displayed on the R&S
FSW and the values for Result Frequency Start and
Result Frequency Stop are corrected to comply with the range limits.
The value range for the offset depends on the selected generator. The default setting
is 0 Hz. Offsets <> 0 Hz are indicated by the "FRQ" label in the channel bar. Negative
offsets can be used to define reverse sweeps.
For more information on coupling frequencies and reverse sweeps see "Coupling the
Frequencies" on page 338. For more information on error messages and the channel
bar see "Displayed Information and Errors" on page 341.
Remote command:
SOURce:
​
EXTernal:
​
FREQuency[:
​
FACTor]:
​
DENominator
​
on page 884
SOURce:
​
EXTernal:
​
FREQuency[:
​
FACTor]:
​
NUMerator
​
on page 885
SOURce:
​
EXTernal:
​
FREQuency:
​
OFFSet
​
on page 885
Result Frequency Start
For reference only: The start frequency for the generator, calculated from the config-
ured generator frequency and the start value defined for the R&S
FSW.
Data Input and Output