Keithley 4200A-SCS Reference Manual page 732

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Model 4200A-SCS Parameter Analyzer Reference Manual

With the voltage source mode (VP), the output value is in volts. For the current source mode (IP), the

output value is in amps.

If you specify a voltage start or step value below 0.001 V, KXCI automatically sets the value to zero.

With the voltage source mode (VP), you are setting the current compliance. For the current source

mode (IP), you are setting the voltage compliance. When sourcing voltage, note that if you specify a

compliance current that is below the minimum allowable value (100 pA with a preamplifier installed

and 100 nA without a preamplifier), KXCI sets it to the minimum allowable value.

If you are using is a SMU as the source, the source mode for the VAR2 steps can be voltage or

current. If, however, a voltage source (VS1...VS9) is being used, the source mode must be voltage

(for configuration details, refer to

If the source stepper index (FF) is omitted, the default is 1 (first stepper). Use the CH command to

define one or more VAR2 sources. The first defined VAR2 is index = 1. Second channel defined as

VAR2 is index = 2, and so on up to a maximum of four VAR2 sources. Note that this is an extension

to the traditional VAR2 capability.

Parameters for the VAR2 step function include the start value, step value, and the number of steps. In

the following figure, the VAR2 step function starts at 5 V, steps in 5 V increments and has 3 steps.

VP 5, 5, 3, 0.01

This command string sets up a VAR2 voltage sweep with start = 5 V, step = 5 V, number of steps = 3, and

compliance = 10 mA. This command string performs the steps shown in the figure in the Details. These

are the same steps that are shown synchronized with sweeps in

CH: SMU channel definition

4200A-901-01 Rev. C / February 2017

Keithley Configuration Utility

Figure 466: Steps resulting from the VP 5, 5, 3, 0.01 command string

(on page 9-14)

Section 9: Keithley External Control Interface (KXCI)

(on page 7-1)).

VR and IR: VAR1 setup

(on page 9-17).