Remote Control Commands > SOURce Subsystem > SOURce:SWEep Subsystem > [:SOURce<hw>]:SWEep[:FREQuency]:STEP:LOGarithmic
[:SOURce<hw>]:SWEep[:FREQuency]:STEP:LOGarithmic <Logarithmic>

Sets a logarithmically determined sweep step size for the RF frequency sweep. It is expressed in percent and you must enter the value and the unit PCT with the command.

The frequency is increased by a logarithmically calculated fraction of the current frequency according to:

step_logn+1 = fn + step_logn x fn

fn+1 = fn + step_logn+1

with fSTARt < fSTOP and n = number of sweep steps

This parameter correlates with the number of steps SWE:FREQ:POIN within the sweep range as follows:

freq_points = ((log fSTOP - log fSTARt) / log step_log) + 1

If you change the step size, the number of steps changes accordingly. The sweep range remains the same.

Parameters:
<Logarithmic>
float
Range: 0.01  to  100
Increment: 1E-3
*RST:1
Example: FREQ:STAR 1GHz

sets the start frequency to 1 GHz.

FREQ:STOP 5GHz

sets the stop frequency to 5 GHz.

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).

Manual operation: See "Step Lin/Log - Frequency Sweep"

 


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