Keithley 6430 User Manual

SCPI Command Reference 17-73
:CENTer <n>
:SPAN <n>
:SOURce[1]:CURRent:CENTer <n> Specify center point of current sweep
:SOURce[1]:VOLTage:CENTer <n> Specify center point of voltage sweep
:SOURce[1]:CURRent:SPAN <n> Specify span of the current sweep
:SOURce[1]:VOLTage:SPAN <n> Specify span of the voltage sweep
Parameters <n> = -210e-3 to 210e-3 Set I-Source level (amps)
-420 to 420 Set V-Source level (volts)
DEFault 0A or 0V
MINimum -210e-3A or -420V
MAXimum +210e-3A or +420V
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 10V, and you
want to sweep from 8 to 12 volts. To do this, you would specify the center to
be 10V and the span to be 4 volts (12 - 8).
Use the :STEP or :POINts command to specify the number of source-
measure 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)

Keithley 6430 Specifications

General

Type	Sub-Femtoamp Remote SourceMeter
Compliance Voltage	200 V
Maximum Output Voltage	200 V
Maximum Output Current	100 mA
Compliance Limit	Programmable
Interface	GPIB, RS-232
Input Impedance	>10^14 Ω