Keithley 4200A-SCS Reference Manual page 735

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Section 9: Keithley External Control Interface (KXCI)

This command sets the ratio value when VAR1' is a selected source function.

When VAR1' is a selected source function, it does the VAR1 sweep with each step scaled by the ratio

(RT) value and offset (FS) value as follows:

VAR1' sweep step = (VAR1 sweep step x RT) + FS

The VAR1 sweep shown in the example in

4 V, and 5 V. The corresponding VAR' sweep has the following steps when RT=3 and FS = 2:

VAR1' step 1 = (1 V × 3) + 2 = 5 V

VAR1' step 2 = (2 V × 3) + 2 = 8 V

VAR1' step 3 = (3 V × 3) + 2 = 11 V

VAR1' step 4 = (4 V × 3) + 2 = 14 V

VAR1' step 5 = (5 V × 3) + 2 = 17 V

This VAR1' sweep (not drawn to scale) is shown in the following figure.

You can assign a unique ratio value to any available SMU channel in the system.

These command strings set up the VAR1' sweep shown in the figure in the Details (ratio = 3, offset = 2).

The above commands set up VAR1' for SMU Channel 2. When Channel 2 is defined for a VAR1' sweep,

ratio is set to 3 and offset is set to 2.

Ratio value: −10 to 10

Available SMU channel (1 to 9); if this parameter is not included, ratio applies to all

channels that are configured to VAR1'

Figure 468: VAR' sweep when ratio = 3 and full-scale = 2

Model 4200A-SCS Parameter Analyzer Reference Manual

(on page 9-17) has five steps: 1 V, 2 V, 3 V,

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