R&S SMB Command Description
1407.0806.32 6.81 E-2
SOURce:]SWEep[:FREQuency]:STEP:LOGarithmic 0.01 ... 9999 PCT
The command specifies the step width factor for logarithmic sweeps. The next frequency value of a
sweep is calculated (for STARt < STOP) using the following formula:
New frequency = Old frequency + STEP:LOG x Old frequency
STEP:LOG therefore gives the fraction of the old frequency. The frequency is increased by this
fraction for the next sweep step. Usually STEP:LOG is given in percent, whereby the suffix PCT must
always be used.
The command is linked to the command :SWEep[:FREQuency]:POINts for STARt < STOP as
follows:
POINts = ((log STOP - log STARt) / log STEP:LOG) + 1
If STEP:LOG changes, the value of POINTs is adjusted. The STARt and STOP value is retained.
Example:
FREQ:STAR 'sets the start frequency to 100 MHz.
FREQ:STOP 'sets the stop frequency to 500 MHz.
SWE:SPAC LOG 'sets logarithmic sweep spacing.
SWE:STEP:LOG 10PCT
'sets the step width for logarithmic sweep spacing to 10% of the previous
frequency in each instance (for a frequency sweep).
*RST value Resolution Options Correlation SCPI
1 PCT 0.01 PCT
The value of :SWE:POIN is adjusted automatically.
Device-specific
[SOURce:]SWEep:POWer:DWELl 2 ms...10 s
The command sets the time taken for each level step of the sweep.
Note:
It is recommended to switch off the GUI update for optimum sweep performance especially with
short dwell times (SYSTem:DISPlay:UPDate OFF).
Example:
SWE:POW:DWEL 12ms 'sets a dwell time of 12 ms for a level sweep.
*RST value Resolution Options SCPI
10 ms 0.1 ms Device-specific
[SOURce:]SWEep:POWer:EXECute
The command triggers a sweep.The command is only valid for sweep mode Single
(SOURce:SWEep:POWer:MODE SINGle). The command corresponds to the manual-control
command EXECUTE SINGLE SWEEP.
The command triggers an event and therefore has no query form and no *RST value.
Example:
SWE:POW:MODE SING 'sets the single cycle mode of the level sweep.
SWE:POW:EXEC 'triggers a level sweep.
*RST value Resolution Options SCPI
- - Device-specific
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