Keithley 6482 - Page 239

16-46 Return to Section Topics 6482-901-01 Rev. A / August 2012
Section 16: SCPI Command Reference Model 6482 Dual-Channel Picoammeter / Voltage Source Reference Manual
CENTer <n>
SPAN <n>
:SOURce[1]:VOLTage:CENTer <n>Specify center point of source 1 sweep
:SOURce[1]:VOLTage:SPAN <n>Specify span of source 1 sweep
:SOURce2:VOLTage:CENTer <n>Specify center point of source 2 sweep
:SOURce2:VOLTage:SPAN <n> Specify span of source 2 sweep
Parameters <n> = -30 to 30 Set SPAN source level (volts)
-30 to 30 Set CENT source level (volts)
DEFault 0 V
MINimum -30 V (SPAN), -30 V (CENT)
MAXimum +30 V (SPAN), +30 (CENT)
Query :CENTer? Query center point for sweep
:CENTer? DEFault Query *RST default level
:CENTer? MINimum Query lowest allowable level
:CENTER? MAXimum Query highest allowable level
:SPAN? Query span for sweep
:SPAN? DEFault Query *RST default level
:SPAN? MINimum Query lowest allowable level
:SPAN? MAXimum Query highest allowable level
Description A sweep can be configured by specifying center and span parameters. By
specifying a center point, you can sweep through the operating point of a device.
The span determines the sweep width with the operating point at the center of the
sweep.
For example, assume you are testing a device that operates at 10 V, and you want
to sweep from 8 to 12 volts. To do this, you would specify the center to be 10 V
and the span to be 4 volts (12 - 8).
Use the :STEP or :POINts command to specify the number of source and mea-
sure points in the sweep.
:CENTer and :SPAN are coupled to :STARt and :STOP. Thus, when center and
span values are changed, the values for start and stop are affected as follows:
Start = Center - (Span / 2)
Stop = Center + (Span / 2)
STEP <n>
:SOURce[1]:VOLTage:STEP <n>Specify step size (source 1 sweep)
:SOURce2:VOLTage:STEP <n> Specify step size (source 2 sweep)
Parameters <n> = -30 to 30 Set source level (volts)
DEFault 0 V
MINimum -30 V
MAXimum +30 V
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 These commands are 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 command to set
the source and measure points for a logarithmic sweep.