Keithley 4200-SCS Reference Manual page 768

Section 9: Keithley External Control Interface (KXCI)
Channel definition page (DE)
The command strings for the DE page are used for the following operations:
• SMU channel definition
• VS1...VSn channel definition
• VM1...VMn channel definition
In order to send the following command strings to the Model 4200-SCS, the channel definition
page must first be selected by sending the following command:
DE
CH Command: SMU channel definition
For every used channel that is configured as an SMU (see KXCI settings in KCON), you have to
specify names for voltage and current, select the source mode (voltage, current, or common), and
select the source function (VAR1, VAR2, constant, or VAR1').
A channel can be disabled by sending the following command:
CHx
Where x = 1-8, the SMU channel to be disabled. For example, to disable channels 1 through 4,
send the following command string:
CH1; CH2; CH3; CH4
The VAR1 source function is used to perform a linear or logarithmic sweep. The VAR1 function
performs a sweep that is synchronized to the steps of VAR2. The VAR1 sweep is performed
whenever VAR2 goes to a new step value. The constant source function outputs a fixed (constant)
source value.
The VAR1' source function is similar to the VAR1 function, except that each sweep step is scaled
by the Ratio value (RT) and an Offset (FS) as follows:
VAR1' sweep step = (VAR1 sweep step × RT) + FS
For example, assume VAR1 is set to sweep from +1V to +3V using 1V steps. If Ratio (RT) is set to
2, and Offset (FS) is set to 1, each step of VAR1' is calculated as follows:
VAR1' step 1 = (1V × 2) + 1 = 3V
VAR1' step 2 = (2V × 2) + 1 = 5 V
VAR1' step 3 = (3V × 2) + 1 = 7V
Use the following command string to define the channel of each SMU:
CHA, 'BBBBBB', 'CCCCCC', D, E
CH
SMU channel
A
Voltage name
BBBBBB =
Current name
CCCCCC =
1. If nothing is specified after the prefix and channel number (that is, CH2 term), the channel is turned off (not used).
9-22
= Command string prefix
1
= 1, 2, ... or n SMU channel number. The largest permissible value of n
equals the number of channels in the system (8 maximum).
User specified name (up to six characters enclosed in single quotes).
User specified name (up to six characters enclosed in single quotes).
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Model 4200-SCS Reference Manual
4200-901-01 Rev. S / May 2017