Rohde & Schwarz SMB 100a - Page 228

Command Description R&S SMB
1407.0806.32 6.36 E-2
SOURce:FREQuency Subsystem
This subsystem contains the commands used to define the frequency settings for the RF sources and
sweeps.
The keyword SOURce is optional with commands and can be omitted.
Command Parameters Default
unit
Remark
[SOURce:]FREQuency:CENTer 300 kHz...RF
max
Hz
[SOURce:]FREQuency[:CW|:FIXed] 300 kHz...RF
max
Hz
[SOURce:]FREQuency[:CW|:FIXed]:RCL INCLude | EXCLude
[SOURce:]FREQuency:MANual 300 kHz...RF
max
Hz
[SOURce:]FREQuency:MODE CW|FIXed | SWEep
[SOURce:]FREQuency:OFFSet 50 ...+50 GHz
Hz
[SOURce:]FREQuency:SPAN 0...RF
max
Hz
[SOURce:]FREQuency:STARt 300 kHz...RF
max
Hz
[SOURce:]FREQuency:STEP[:INCRement] 0...RF
max
- 100 kHz
Hz
[SOURce:]FREQuency:STEP:MODE
USER | DECimal
[SOURce:]FREQuency:STOP 300 kHz...RF
max
Hz
[SOURce:]FREQuency:CENTer 300 kHz...RF
max
(RF
max
depending on model)
The command sets the center frequency of the sweep. This setting in combination with the span
setting ([SOURce:]FREQuency:SPAN) defines the sweep range.
This command is linked to the commands [SOURce:]FREQuency:STARt and
[SOURce:]FREQuency:STOP, i.e. changing these values causes the CENTer value to change, and
vice versa:
CENTer = (STARt + STOP)/2.
As with the Frequency value entered in the header, the OFFSet value is also taken into
consideration with this command. The specified value range is therefore only effective if OFFSet is
set to 0. The value range for other OFFset values can be calculated using the following formula:
300 kHz + OFFSet ... RF
max
+OFFSet
Example:
FREQ:CENT 400 MHz
'sets the center frequency for the frequency sweep to 400 MHz.
FREQ:SPAN 200 MHz
'sets a span of 200 MHz. This sets the sweep range to 300 MHz to 500 MHz.
*RST
value
Resolution Options Correlation SCPI
300 MHz 0.01 Hz CENTer = (STARt + STOP)/2 Compliant