Common measurement settings
R&S
®
FSVA3000/ R&S
®
FSV3000
379
User Manual 1178.8520.02 ─ 08
values are corrected to comply
with the range limits.
The calibration sweep nevertheless covers the entire span defined by the R&S
FSV/A;
however, no input is received from the generator outside the generator's defined limits.
TTL synchronization
Some Rohde
&
Schwarz signal generators support TTL synchronization. The TTL
interface is included in the AUX control connector of the External Generator Control
option. Without TTL synchronization, the R&S
FSV/A sets the generator frequency for
each frequency point individually, and only when the setting procedure is finished, the
R&S
FSV/A can measure the next sweep point.
For generators with a TTL interface, the R&S
FSV/A sends a list of the frequencies to
be set to the generator before the beginning of the first sweep. Then the R&S
FSV/A
starts the sweep and the next frequency point is selected by both the R&S
FSV/A and
the generator using the TTL handshake line "TRIGGER". The R&S
FSV/A can only
measure a value when the generator signals the end of the setting procedure via the
"BLANK" signal.
Using the TTL interface allows for considerably higher measurement rates, because
the frequency stepping of the R&S
FSV/A is directly coupled with the frequency step-
ping of the generator.
Reverse sweep
The frequency offset for automatic coupling can be used to sweep in the reverse direc-
tion. To do so, define a negative offset in the external generator measurement configu-
ration. (Note that the frequency is defined as the unsigned value of the equation, thus a
negative frequency is not possible.)
Example: Example for reverse sweep
F
AnalyzerStart
= 100 MHz
F
AnalyzerStop
= 200 MHz
F
Offset
= -300 MHz
Numerator = Denominator = 1
→
F
GeneratorStart
= 200 MHz
→
F
GeneratorStop
= 100 MHz
If the offset is adjusted so that the sweep of the generator crosses the minimum gener-
ator frequency, a message is displayed in the status bar ("Reverse Sweep via min. Ext.
Generator Frequency!").
Data input and output
