Keithley 4200A-SCS Reference Manual page 893

Section 13: LPT library function reference
Details
The trigXl and trigXg commands are used with the searchX command or with one of the sweep
measurement commands: smeasX, sintgX, or savgX.
•
The trigXg or trigXl command provides the sweepX command the digital feedback to allow
for the increase or decrease in sourcing values.
•
The trigXl and trigXg commands must be located before any associated searchX
commands.
•
Triggers are not automatically reset by the searchX or sweepX command. A single call to the
trigXl or trigXg command can be followed by two or more calls to the searchX or sweepX
commands.
The specified trigger point is automatically cleared when a clrtrg, execut, or devint command is
executed.
Example 1
double res22, vcc8;
.
.
conpin(SMU1, 3, 0);
conpin(SMU2, 2, 0);
conpin(GND, 1, 0);
forcev(SMU2, vcc8); /* Apply collector voltage to vcc8. */
trigig(SMU2, +5.0E-3); /* Search for a collector */
/* current of 5 mA. */
searchi(SMU1, 5.0E-5, 2.0E-4, 15, 1.0E-3, &res22); /* Generate */
/* a current ranging */
/* from 50 uA to 200 uA in */
/* 15 iterations. Return the */
/* current resulting from the */
/* last iteration as res22. */
This example uses the trigig and searchi commands together to generate and search for a specific
current level. A search is initiated to find the base current needed to produce 5 mA of collector current. The
collector-emitter voltage supplied by SMU2 is defined by the variable vcc8. The searchi command
generates the base current from SMU1. This current ranges between 50 mA and 200 mA in 15 iterations.
The trigig command continuously monitors the current through SMU1. The base current supplied by
SMU1 is stored as the result res22.
13-48
Model 4200A-SCS Parameter Analyzer Reference Manual
4200A-901-01 Rev. C / February 2017