Using Source Compliance Limits; Lpt Functions - Keithley 4200-SCS Reference Manual

Model 4200-SCS Reference Manual

Using source compliance limits

When sourcing voltage (forcev), a current compliance limit can be set. When sourcing current
(forcei), a voltage compliance limit can be set. The SMU will not exceed the compliance limits.
The limitX functions are used to set the compliance limits (limiti sets current compliance and
limitv sets voltage compliance). The actual compliance limit that is in effect depends on the
present measurement range. If the SMU is on a range that can accommodate the compliance limit
value, then that compliance limit will be in effect. If the SMU is on a range that is too low for the
compliance limit, the full scale value of the range will instead be used.
For example, if the compliance limit setting is 5 mA, but the SMU is on the 1mA range, the actual
compliance will be 1.05 mA (full scale value). When the SMU goes up to the 10 mA range, the
5 mA compliance limit goes into effect.
There are two ways to perform a measure range change; manually select a range or use
autorange. A range is manually selected by using a rangeX function. When a rangeX function is
not used, the SMU will use autoranging when a measure function (intgX, measX, avgX, or
bmeasX) is called.
The following procedures demonstrate the proper sequence for using the limit, range, source, and
measure functions.
Autoranging: For autoranged measurements, perform the following steps to perform a source-
measure operation:
1.
2.
3.
For source-only functionality, a dummy measurement (Step 3 above) needs to be made if an
increase in the measurement range is required for a new compliance limit setting.
Manual ranging: When using a manual measurement range, to perform a source-measure
operation:
1.
2.
3.
4.
For source-only operation, omit Step 4 of the above procedure.

LPT functions

In Table
and general operations are listed alphabetically after the table (see
general operations
Details on functions for the pulse generators are described:
4200-901-01 Rev. S / May 2017
Use a limitX function to set the desired compliance limit.
Use a forceX function to output a source value.
Use a measuring function (intgX, measX, or avgX) to perform an autoranged current or
voltage measurement. Before performing the measurement, the SMU will first go to the
most sensitive range for the measured reading.
Use a limitX function to set the compliance limit.
Use a rangeX function to select a manual measure range that will accommodate the
compliance limit and the measured reading.
Use a forceX function to output a source value.
Use a measuring function (intgX, measX or avgX) to perform a current or voltage
measurement.
8-11, function calls are grouped by function. The details about the functions for the SMUs
later in this section).
• For the 4205-PG2, see
• For the 4220-PGU and 4225-PMU, see
PMU.
Return to
LPT functions for the Model
LPT functions for the Models 4220-PGU and 4225-
Section Topics
Section 8: Keithley User Library Tool (KULT)
LPT functions for SMUs and
4205-PG2.
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