Keysight x-series User Reference Manual page 459

Example
Notes
Dependencies
Couplings
EMI Receiver Mode Reference
FSC:SCAN2:STEP 100kHz Set the step size of Range 2 to 100 kHz.
FSC:SCAN2:STEP?
FSC:SCAN3:STEP:AUTO 1 ! Turn on Auto Step Size in range 3.
FSC:SCAN3:STEP:AUTO?
When set to auto, the selected Auto Step Size Rules will be used to calculate the step size.
Points/ RBW
Scan point is calculated based on the number of points for each RBW width, the smallest odd
number >= Number of Points*(Stop Frequency-Start Frequency)/RBW will be used as the scan
points. The step size is then calculated based on scan point, using the formula Step Size = (Stop
Frequency-Start Frequency)/Scan Point–1.
Log % of Freq
Step Size is calculated based on the Log % of Freq of the current frequency. E.g. Range Start = 10
MHz, Range Stop= 20 MHz, Log % of Freq = 10. The frequency will step in the following step size:
1 MHz
1.1 MHz
1.21 MHz
1.331 MHz
1.4641 MHz
1.61051 MHz
1.771561 MHz
1.9487171 MHz
2.14358881 MHz
The first step size will be shown on the Step Size key, where in the example above, the value 1 will
be shown. Please take note that Log % of Freq is only available during the Discrete (Stepped) scan.
This key is grayed out when the Step Control is set to "Scan Time & Points". If the grayed out key is
pressed, an advisory message is generated. If the equivalent SCPI command is sent, this same
message is generated as part of a "–221, Settings conflict; Function not available while running
multirange scan" warning.
This key is grayed out during multi range scanning. If the grayed out key is pressed, an advisory
message is generated. If the equivalent SCPI command is sent, this same message is generated as
part of a "–221, Settings conflict; Function not available while running multirange scan" warning.
This key is grayed out during final measurement. If the grayed out key is pressed, an advisory
message is generated. If the equivalent SCPI command is sent, this same message is generated as
part of a "–221, Settings conflict" warning.
This key is grayed out during a Time Domain Scan. If the grayed out key is pressed, an advisory
message is generated. If the equivalent SCPI command is sent, this same message is generated as
part of a "–221, Settings conflict; Function not available with time domain scan type" warning.
For numeric entries in Smooth Scan, the step size chooses the nearest step size based on the Sweep
Point converted from the step size, where Sweep Point = (Stop Frequency-Start Frequency)/Step
Size. The Sweep Point will be rounded to the nearest integer and the actual step size will be
calculated using (Stop Frequency-Start Frequency)/Sweep Point. A message is generated as part of a
"–221, Settings conflict" warning.
For numeric entries in Time Domain Scan, the step size chooses the nearest step size based on the
RBW/Step Size ratio, which must be 4.
8 Frequency Scan Measurement
Meas Setup
459