Limitx - Keithley 4200A-SCS Reference Manual

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Model 4200A-SCS Parameter Analyzer Reference Manual

limitX

This command allows the programmer to specify a current or voltage limit other than the default limit of the

int limiti(int instr_id, double limit_val);

int limitv(int instr_id, double limit_val);

The parameter limit_val is bidirectional. For example, the command limitv(SMU1, 10.0)

limits the voltage of the current source SMU1 to ±10.0 V. The command limiti(SMU1, 1.5E-3)

limits the current of the voltage source SMU1 to ±1.5 mA.

Use the limiti command to limit the current of a voltage source. Use the limitv command to limit

the voltage of a current source.

If the instrument is ranged below the programmed limit value, the instrument will temporarily limit to

full scale of range.

This command must be called in the test sequence before the associated forceX, pulseX,

bsweepX, sweepX, or searchX command is used to generate the voltage or current. The limitX

command also sets the top measurement range of an autoranged measurement.

The limits set within a particular test sequence are cleared when the devint or execut command is

If you need a voltage limit greater than 20 V at a source-measure unit (SMU) that has been set to

force zero current, call the measv command to set the SMU to autorange to a higher range, or use

the rangev command to set a higher voltage range. Similarly, if you need a current limit of greater

than 10 mA at a SMU that has been set to force zero volts, call the measi command to set the SMU

to autorange to a higher range or use the rangev command to set a higher current range.

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

The instrument identification code of the instrument on which to impose a source

The maximum level of the current or voltage; see Details

Section 13: LPT library function reference