Keithley 4200-SCS Reference Manual page 248

Section 6: Keithley Interactive Test Environment (KITE)
Figure 6-144
Current Step Forcing Functions/Measure Options window
The Current Step Function Parameters are configurable as listed below.
• Start: The Start edit box specifies the current forced for the first step value. The Start
parameter may be any valid SMU current, the units for which are selected through the
combo box at the right of the edit box.
• Stop: The Stop edit box determines the current forced for the last step value. The Stop
parameter may be any valid SMU current, the units for which are selected through the
combo box at the right of the edit box.
• Step: The Step edit box specifies the current-step increments and determines the Data
Points value {Data points value = integer value of [1 + (Stop value - Start value)/(Step
value)].
The Step parameter may be any valid SMU current value, the units for which are selected
using the combo box at the right of the edit box. However, note the following:
- It is best to specify a Step value that divides evenly into (Stop value - Start value). If the
- For example: If Start = 0A, Stop = 0.005 A, and Step = 0.0015 A:
- KITE never steps the force current beyond the value specified by the Stop parameter,
• Data Points: The Data Points value is calculated by KITE and is read-only. Refer to the
above description of the Step parameter.
- Data Points value = integer of [1 + (Stop value - Start value)/(Step value)]
• Src Range: The Src Range (source range) combo box specifies the SMU current range
used to force the sweep current, per the following options:
- The Auto option commands the SMU to automatically optimize the current range as the
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ratio [(Stop value - Start value)/(Step value)] is not an integer, the last, fractional step
increment of the sweep is rejected and the last current value is smaller than the Stop
value.
• Data Points value = integer of [1+ (0.005 - 0)/(0.0015)] = integer of [4.333] = 4
• Four values are forced: 0A, 0.0015 A, 0.0030A, and 0. 0045 A.
even if you specify a Step value that is larger than the Stop value.
stepping progresses. This option provides the best current resolution and control when
stepping several decades. However, the range-change time delays limit the stepping
speed.
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Model 4200-SCS Reference Manual
4200-901-01 Rev. S / May 2017