R&S SMC100A Command Description
1411.4060.32 6.79 E-1
[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 12 m
'sets a dwell time of 12 ms for a level sweep.
*RST value Resolution Options SCPI
10 ms 0.1 ms Device-specific
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