Keithley 2520, User Manual, Page: 228 / 329

Model 2520 User’s Manual SCPI Command Reference 14-39
:CENTer and :SPAN are coupled to STARt and :STOP. Thus, when cen-
ter and span values are changed, the values for start and stop are affected
as follows:
Start = Center - (Span / 2)
Stop = (Span / 2)
STEP <n>
:SOURce[1]:CURRent:STEP <n> Specify step size for sweep
Parameters
<n> = 0 to 5.0 Set source level (amps)
DEFault 0A
MINimum 0A
MAXimum 5.0A
Query
:STEP Query step size for sweep
:STEP? DEFault Query *RST default level
:STEP? MINimum Query lowest allowable level
:STEP? MAXimum Query highest allowable level
Description
This command is used to specify a step size for a linear sweep. When
the sweep is started, the source level changes in equal steps from the
start level to the stop level. A measurement is performed at each source
step (including the start and stop levels).
NOTE This command cannot be used for a logarithmic sweep. Use the :POINts com-
mand to set the source and measure points for a log sweep.
To avoid a setting conflicts error, make sure the step size is greater than
the start value and less than the stop value.
The number of source and measure points in a linear sweep can be cal-
culated as follows:
Points = [(Stop - Start) / Step] + 1
Points = (Span / Step) + 1
An alternate way to set the source and measure points in a linear sweep
is to simply specify the number of source and measure points in the
sweep using the :POINts command.
Note that the :STEP and :POINts commands are coupled. Changing the
step size also changes the number of source and measure points. Con-
versely, changing the number of source and measure points changes the
step size.