Keithley 4200A-SCS Reference Manual page 927

Section 13: LPT library function reference
Example
double res1, res2;
.
.
conpin(GND, 2, 3, 0);
conpin(SMU1, 1, 0);
conpin(SMU2, 4, 0);
forcev(SMU1, .5);
trigig(SMU1, +1.E-5); /* Set the trigger point for */
/* 10 mA. */
searchv(SMU2, 0.0, 3.0, 7, 2.0E-5, &res1); /* Increase */
/* voltage until */
/* trigger point occurs. */
/* Return results to res1. */
pulsev(SMU2, 20.0, 5.E-1); /* Apply a 20 V pulse to the */
/* gate for 500 ms. */
searchv(SMU2, 0.0, 3.0, 7, 2.0E-5, &res2); /* Increase */
/* voltage until */
/* trigger point occurs. */
/* Return results to res2. */
This example measures the threshold voltage shift of an FET by calling two searchv commands:
1. The searchv command measures the gate voltage required to initiate a drain current of 10 μA.
2. The searchv command measures the gate voltage required to initiate a drain current of 10 μA
immediately after a 20 V pulse is applied to the gate.
Note that the second searchv command was called without reprogramming the trigil command. This
Also see
None
13-82
is possible because the clear trigger command (clrtrg) was not used.
Model 4200A-SCS Parameter Analyzer Reference Manual
4200A-901-01 Rev. C / February 2017