Keithley 4200A-SCS - Page 735

Section
9: Keithley External Control Interface (KXCI) Model 4200A-SCS Parameter Analyzer
Reference Manual
9-24 4200A-901-01 Rev. C / February 2017
RT
This command sets the ratio value when VAR1' is a selected source function.
Usage
RT ±AA.A
RT ±AA.A,B
AAA.A
Ratio value: −10 to 10
B
Available SMU channel (1 to 9); if this parameter is not included, ratio applies to all
channels that are configured to VAR1'
Details
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 VR and IR (on page 9-17
) has five steps: 1 V, 2 V, 3 V,
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.
Figure 468: VAR' sweep when ratio = 3 and full-scale = 2
You can assign a unique ratio value to any available SMU channel in the system.
Example
RT +3,2 Ratio
FS +2,2 Offset
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.
Also see
None